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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 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.
*/
/**
* @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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