2 This file is part of GNUnet
3 (C) 2012-2013 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.
21 * @file peerstore/peerstore_common.c
22 * @brief Helper peerstore functions
23 * @author Omar Tarabai
26 #include "peerstore_common.h"
29 * Creates a hash of the given key combination
33 PEERSTORE_hash_key(const char *sub_system,
34 const struct GNUNET_PeerIdentity *peer,
36 struct GNUNET_HashCode *ret)
45 sssize = strlen(sub_system) + 1;
46 psize = sizeof(struct GNUNET_PeerIdentity);
47 ksize = strlen(key) + 1;
48 totalsize = sssize + psize + ksize;
49 block = GNUNET_malloc(totalsize);
51 memcpy(blockptr, sub_system, sssize);
53 memcpy(blockptr, peer, psize);
55 memcpy(blockptr, key, ksize);
56 GNUNET_CRYPTO_hash(block, totalsize, ret);
61 * Creates a record message ready to be sent
63 * @param sub_system sub system string
64 * @param peer Peer identity (can be NULL)
65 * @param key record key string (can be NULL)
66 * @param value record value BLOB (can be NULL)
67 * @param value_size record value size in bytes (set to 0 if value is NULL)
68 * @param expiry absolute time after which the record expires
69 * @param msg_type message type to be set in header
70 * @return pointer to record message struct
72 struct StoreRecordMessage *
73 PEERSTORE_create_record_message(const char *sub_system,
74 const struct GNUNET_PeerIdentity *peer,
78 struct GNUNET_TIME_Absolute *expiry,
81 struct StoreRecordMessage *srm;
87 ss_size = strlen(sub_system) + 1;
91 key_size = strlen(key) + 1;
92 request_size = sizeof(struct StoreRecordMessage) +
96 srm = GNUNET_malloc(request_size);
97 srm->header.size = htons(request_size);
98 srm->header.type = htons(msg_type);
99 srm->key_size = htons(key_size);
101 srm->expiry = *expiry;
103 srm->peer_set = htons(GNUNET_NO);
106 srm->peer_set = htons(GNUNET_YES);
109 srm->sub_system_size = htons(ss_size);
110 srm->value_size = htons(value_size);
112 memcpy(dummy, sub_system, ss_size);
114 memcpy(dummy, key, key_size);
116 memcpy(dummy, value, value_size);
122 * Creates a MQ envelope for a single record
124 * @param sub_system sub system string
125 * @param peer Peer identity (can be NULL)
126 * @param key record key string (can be NULL)
127 * @param value record value BLOB (can be NULL)
128 * @param value_size record value size in bytes (set to 0 if value is NULL)
129 * @param expiry time after which the record expires
130 * @param msg_type message type to be set in header
131 * @return pointer to record message struct
133 struct GNUNET_MQ_Envelope *
134 PEERSTORE_create_record_mq_envelope(const char *sub_system,
135 const struct GNUNET_PeerIdentity *peer,
139 struct GNUNET_TIME_Absolute *expiry,
140 enum GNUNET_PEERSTORE_StoreOption options,
143 struct StoreRecordMessage *srm;
144 struct GNUNET_MQ_Envelope *ev;
150 GNUNET_assert(NULL != sub_system);
151 ss_size = strlen(sub_system) + 1;
155 key_size = strlen(key) + 1;
159 ev = GNUNET_MQ_msg_extra(srm, msg_size, msg_type);
160 srm->key_size = htons(key_size);
162 srm->expiry = *expiry;
164 srm->peer_set = htons(GNUNET_NO);
167 srm->peer_set = htons(GNUNET_YES);
170 srm->sub_system_size = htons(ss_size);
171 srm->value_size = htons(value_size);
172 srm->options = options;
174 memcpy(dummy, sub_system, ss_size);
176 memcpy(dummy, key, key_size);
178 memcpy(dummy, value, value_size);
184 * Parses a message carrying a record
186 * @param message the actual message
187 * @return Pointer to record or NULL if error
189 struct GNUNET_PEERSTORE_Record *
190 PEERSTORE_parse_record_message(const struct GNUNET_MessageHeader *message)
192 struct StoreRecordMessage *srm;
193 struct GNUNET_PEERSTORE_Record *record;
200 req_size = ntohs(message->size);
201 if(req_size < sizeof(struct StoreRecordMessage))
203 srm = (struct StoreRecordMessage *)message;
204 ss_size = ntohs(srm->sub_system_size);
205 key_size = ntohs(srm->key_size);
206 value_size = ntohs(srm->value_size);
207 if(ss_size + key_size + value_size + sizeof(struct StoreRecordMessage)
210 record = GNUNET_new(struct GNUNET_PEERSTORE_Record);
211 if(GNUNET_YES == ntohs(srm->peer_set))
213 record->peer = GNUNET_new(struct GNUNET_PeerIdentity);
214 memcpy(record->peer, &srm->peer, sizeof(struct GNUNET_PeerIdentity));
216 record->expiry = GNUNET_new(struct GNUNET_TIME_Absolute);
217 *(record->expiry) = srm->expiry;
218 dummy = (char *)&srm[1];
221 record->sub_system = GNUNET_strdup(dummy);
226 record->key = GNUNET_strdup(dummy);
231 record->value = GNUNET_malloc(value_size);
232 memcpy(record->value, dummy, value_size);
234 record->value_size = value_size;
240 * Free any memory allocated for this record
244 void PEERSTORE_destroy_record(struct GNUNET_PEERSTORE_Record *record)
246 if(NULL != record->sub_system)
247 GNUNET_free(record->sub_system);
248 if(NULL != record->peer)
249 GNUNET_free(record->peer);
250 if(NULL != record->key)
251 GNUNET_free(record->key);
252 if(NULL != record->value)
254 GNUNET_free(record->value);
257 if(NULL != record->expiry)
258 GNUNET_free(record->expiry);