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13 General Public License for more details.
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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)
95 ret = sizeof (struct NetworkRecord) * rd_count;
96 for (unsigned int i=0;i<rd_count;i++)
98 if ((ret + rd[i].data_size) < ret)
103 ret += rd[i].data_size;
108 str = GNUNET_GNSRECORD_value_to_string (rd[i].record_type,
125 return (ssize_t) ret;
130 * Serialize the given records to the given destination buffer.
132 * @param rd_count number of records in the rd array
133 * @param rd array of #GNUNET_GNSRECORD_Data with @a rd_count elements
134 * @param dest_size size of the destination array
135 * @param dest where to write the result
136 * @return the size of serialized records, -1 if records do not fit
139 GNUNET_GNSRECORD_records_serialize (unsigned int rd_count,
140 const struct GNUNET_GNSRECORD_Data *rd,
144 struct NetworkRecord rec;
148 for (unsigned int i=0;i<rd_count;i++)
150 LOG (GNUNET_ERROR_TYPE_DEBUG,
151 "Serializing record %u with flags %d and expiration time %llu\n",
154 (unsigned long long) rd[i].expiration_time);
155 rec.expiration_time = GNUNET_htonll (rd[i].expiration_time);
156 rec.data_size = htonl ((uint32_t) rd[i].data_size);
157 rec.record_type = htonl (rd[i].record_type);
158 rec.flags = htonl (rd[i].flags);
159 if ( (off + sizeof (rec) > dest_size) ||
160 (off + sizeof (rec) < off) )
165 GNUNET_memcpy (&dest[off],
169 if ( (off + rd[i].data_size > dest_size) ||
170 (off + rd[i].data_size < off) )
175 GNUNET_memcpy (&dest[off],
178 off += rd[i].data_size;
183 str = GNUNET_GNSRECORD_value_to_string (rd[i].record_type,
200 * Deserialize the given records to the given destination.
202 * @param len size of the serialized record data
203 * @param src the serialized record data
204 * @param rd_count number of records in the rd array
205 * @param dest where to put the data
206 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
209 GNUNET_GNSRECORD_records_deserialize (size_t len,
211 unsigned int rd_count,
212 struct GNUNET_GNSRECORD_Data *dest)
214 struct NetworkRecord rec;
218 for (unsigned int i=0;i<rd_count;i++)
220 if ( (off + sizeof (rec) > len) ||
221 (off + sizeof (rec) < off) )
224 return GNUNET_SYSERR;
229 dest[i].expiration_time = GNUNET_ntohll (rec.expiration_time);
230 dest[i].data_size = ntohl ((uint32_t) rec.data_size);
231 dest[i].record_type = ntohl (rec.record_type);
232 dest[i].flags = ntohl (rec.flags);
234 if ( (off + dest[i].data_size > len) ||
235 (off + dest[i].data_size < off) )
238 return GNUNET_SYSERR;
240 dest[i].data = &src[off];
241 off += dest[i].data_size;
242 #if GNUNET_EXTRA_LOGGING
246 str = GNUNET_GNSRECORD_value_to_string (dest[i].record_type,
252 return GNUNET_SYSERR;
257 LOG (GNUNET_ERROR_TYPE_DEBUG,
258 "Deserialized record %u with flags %d and expiration time %llu\n",
261 (unsigned long long) dest[i].expiration_time);
267 /* end of gnsrecord_serialization.c */