peerstore_common.c

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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
 */
#include "peerstore_common.h"

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);
}


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;
}


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;
}


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);
}