messenger_api_util.c

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/*
   This file is part of GNUnet.
   Copyright (C) 2020--2021 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 "platform.h"
#include "messenger_api_util.h"
 
static void
callback_close_channel (void *cls)
{
  struct GNUNET_CADET_Channel *channel = cls;
 
  if (channel)
    GNUNET_CADET_channel_destroy (channel);
}
 
void
delayed_disconnect_channel (struct GNUNET_CADET_Channel *channel)
{
  GNUNET_assert(channel);
 
  GNUNET_SCHEDULER_add_delayed_with_priority (GNUNET_TIME_relative_get_zero_ (),
                                              GNUNET_SCHEDULER_PRIORITY_URGENT,
                                              callback_close_channel, channel);
}
 
int
generate_free_member_id (struct GNUNET_ShortHashCode *id,
                         const struct GNUNET_CONTAINER_MultiShortmap *members)
{
  GNUNET_assert(id);
 
  size_t counter = 1 + (members ? GNUNET_CONTAINER_multishortmap_size (members) : 0);
 
  do
  {
    GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_STRONG, id, sizeof(struct GNUNET_ShortHashCode));
 
    if ((members) && (GNUNET_YES == GNUNET_CONTAINER_multishortmap_contains (members, id)))
      counter--;
    else
      break;
  }
  while (counter > 0);
 
  if (counter)
    return GNUNET_YES;
 
  return GNUNET_NO;
}
 
const struct GNUNET_IDENTITY_PublicKey*
get_anonymous_public_key ()
{
  static struct GNUNET_IDENTITY_PublicKey public_key;
  static struct GNUNET_IDENTITY_Ego* ego = NULL;
 
  if (!ego)
  {
    ego = GNUNET_IDENTITY_ego_get_anonymous();
    GNUNET_IDENTITY_ego_get_public_key(ego, &public_key);
  }
 
  return &public_key;
}
 
void
convert_messenger_key_to_port(const struct GNUNET_HashCode *key,
                              struct GNUNET_HashCode *port)
{
  static uint32_t version_value = 0;
  static struct GNUNET_HashCode version;
 
  if (!version_value) {
    version_value = (uint32_t) (GNUNET_MESSENGER_VERSION);
    version_value = ((version_value >> 16) & 0xFFFF);
    version_value = GNUNET_htole32(version_value);
    GNUNET_CRYPTO_hash(&version_value, sizeof(version_value), &version);
  }
 
  GNUNET_CRYPTO_hash_sum(key, &version, port);
}