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- /*
- This file is part of GNUnet
- Copyright (C) 2012-2013 GNUnet e.V.
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- or (at your option) any later version.
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Affero General Public License for more details.
-
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @file peerstore/peerstore_common.c
- * @brief Helper peerstore functions
- * @author Omar Tarabai
- */
- #include "peerstore_common.h"
- /**
- * Creates a hash of the given key combination
- *
- */
- void
- PEERSTORE_hash_key (const char *sub_system,
- const struct GNUNET_PeerIdentity *peer,
- const char *key,
- struct GNUNET_HashCode *ret)
- {
- size_t sssize;
- size_t psize;
- size_t ksize;
- size_t totalsize;
- void *block;
- void *blockptr;
- sssize = strlen (sub_system) + 1;
- psize = sizeof (struct GNUNET_PeerIdentity);
- ksize = strlen (key) + 1;
- totalsize = sssize + psize + ksize;
- block = GNUNET_malloc (totalsize);
- blockptr = block;
- GNUNET_memcpy (blockptr, sub_system, sssize);
- blockptr += sssize;
- GNUNET_memcpy (blockptr, peer, psize);
- blockptr += psize;
- GNUNET_memcpy (blockptr, key, ksize);
- GNUNET_CRYPTO_hash (block, totalsize, ret);
- GNUNET_free (block);
- }
- /**
- * Creates a MQ envelope for a single record
- *
- * @param sub_system sub system string
- * @param peer Peer identity (can be NULL)
- * @param key record key string (can be NULL)
- * @param value record value BLOB (can be NULL)
- * @param value_size record value size in bytes (set to 0 if value is NULL)
- * @param expiry time after which the record expires
- * @param options options specific to the storage operation
- * @param msg_type message type to be set in header
- * @return pointer to record message struct
- */
- struct GNUNET_MQ_Envelope *
- PEERSTORE_create_record_mq_envelope (const char *sub_system,
- const struct GNUNET_PeerIdentity *peer,
- const char *key,
- const void *value,
- size_t value_size,
- struct GNUNET_TIME_Absolute expiry,
- enum GNUNET_PEERSTORE_StoreOption options,
- uint16_t msg_type)
- {
- struct StoreRecordMessage *srm;
- struct GNUNET_MQ_Envelope *ev;
- size_t ss_size;
- size_t key_size;
- size_t msg_size;
- void *dummy;
- GNUNET_assert (NULL != sub_system);
- ss_size = strlen (sub_system) + 1;
- if (NULL == key)
- key_size = 0;
- else
- key_size = strlen (key) + 1;
- msg_size = ss_size + key_size + value_size;
- ev = GNUNET_MQ_msg_extra (srm, msg_size, msg_type);
- srm->key_size = htons (key_size);
- srm->expiry = GNUNET_TIME_absolute_hton (expiry);
- if (NULL == peer)
- srm->peer_set = htons (GNUNET_NO);
- else
- {
- srm->peer_set = htons (GNUNET_YES);
- srm->peer = *peer;
- }
- srm->sub_system_size = htons (ss_size);
- srm->value_size = htons (value_size);
- srm->options = htonl (options);
- dummy = &srm[1];
- GNUNET_memcpy (dummy, sub_system, ss_size);
- dummy += ss_size;
- GNUNET_memcpy (dummy, key, key_size);
- dummy += key_size;
- GNUNET_memcpy (dummy, value, value_size);
- return ev;
- }
- /**
- * Parses a message carrying a record
- *
- * @param srm the actual message
- * @return Pointer to record or NULL if error
- */
- struct GNUNET_PEERSTORE_Record *
- PEERSTORE_parse_record_message (const struct StoreRecordMessage *srm)
- {
- struct GNUNET_PEERSTORE_Record *record;
- uint16_t req_size;
- uint16_t ss_size;
- uint16_t key_size;
- uint16_t value_size;
- char *dummy;
- req_size = ntohs (srm->header.size) - sizeof (*srm);
- ss_size = ntohs (srm->sub_system_size);
- key_size = ntohs (srm->key_size);
- value_size = ntohs (srm->value_size);
- if (ss_size + key_size + value_size != req_size)
- {
- GNUNET_break (0);
- return NULL;
- }
- record = GNUNET_new (struct GNUNET_PEERSTORE_Record);
- if (GNUNET_YES == ntohs (srm->peer_set))
- {
- record->peer = srm->peer;
- }
- record->expiry = GNUNET_TIME_absolute_ntoh (srm->expiry);
- dummy = (char *) &srm[1];
- if (ss_size > 0)
- {
- record->sub_system = GNUNET_strdup (dummy);
- dummy += ss_size;
- }
- if (key_size > 0)
- {
- record->key = GNUNET_strdup (dummy);
- dummy += key_size;
- }
- if (value_size > 0)
- {
- record->value = GNUNET_malloc (value_size);
- GNUNET_memcpy (record->value,
- dummy,
- value_size);
- }
- record->value_size = value_size;
- return record;
- }
- /**
- * Free any memory allocated for this record
- *
- * @param record
- */
- void
- PEERSTORE_destroy_record (struct GNUNET_PEERSTORE_Record *record)
- {
- if (NULL != record->sub_system)
- GNUNET_free (record->sub_system);
- if (NULL != record->key)
- GNUNET_free (record->key);
- if (NULL != record->value)
- {
- GNUNET_free (record->value);
- record->value = 0;
- }
- GNUNET_free (record);
- }
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