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/*
This file is part of GNUnet
(C) 2012-2013 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file peerstore/peerstore_common.c
* @brief Helper peerstore functions
* @author Omar Tarabai
*/
#include "peerstore_common.h"
/**
* Creates a record message ready to be sent
*
* @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 lifetime relative time after which the record expires
* @return pointer to record message struct
*/
struct StoreRecordMessage *
PEERSTORE_create_record_message(const char *sub_system,
const struct GNUNET_PeerIdentity *peer,
const char *key,
const void *value,
size_t value_size,
struct GNUNET_TIME_Relative lifetime)
{
struct StoreRecordMessage *srm;
size_t ss_size;
size_t key_size;
size_t request_size;
void *dummy;
ss_size = strlen(sub_system) + 1;
if(NULL == key)
key_size = 0;
else
key_size = strlen(key) + 1;
request_size = sizeof(struct StoreRecordMessage) +
ss_size +
key_size +
value_size;
srm = GNUNET_malloc(request_size);
srm->header.size = htons(request_size);
srm->header.type = htons(GNUNET_MESSAGE_TYPE_PEERSTORE_STORE);
srm->key_size = htons(key_size);
srm->lifetime = lifetime;
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);
dummy = &srm[1];
memcpy(dummy, sub_system, ss_size);
dummy += ss_size;
memcpy(dummy, key, key_size);
dummy += key_size;
memcpy(dummy, value, value_size);
return srm;
}
/**
* Parses a message carrying a record
*
* @param message the actual message
* @return Pointer to record or NULL if error
*/
struct GNUNET_PEERSTORE_Record *
PEERSTORE_parse_record_message(const struct GNUNET_MessageHeader *message)
{
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(message->size);
if(req_size < sizeof(struct StoreRecordMessage))
return NULL;
srm = (struct StoreRecordMessage *)message;
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 + sizeof(struct StoreRecordMessage)
!= req_size)
return NULL;
record = GNUNET_new(struct GNUNET_PEERSTORE_Record);
if(GNUNET_YES == ntohs(srm->peer_set))
{
record->peer = GNUNET_new(struct GNUNET_PeerIdentity);
memcpy(record->peer, &srm->peer, sizeof(struct GNUNET_PeerIdentity));
}
record->lifetime = srm->lifetime;
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);
memcpy(record->value, dummy, value_size);
}
record->value_size = value_size;
return record;
}
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