1 files changed, 64 insertions, 0 deletions
diff --git a/src/messenger/gnunet-service-messenger_util.c b/src/messenger/gnunet-service-messenger_util.c
new file mode 100644
index 000000000..94fc9469d
--- /dev/null
+++ b/src/messenger/gnunet-service-messenger_util.c
@@ -0,0 +1,64 @@
+/*
+   This file is part of GNUnet.
+   Copyright (C) 2020 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
+ */
+/**
+ * @author Tobias Frisch
+ * @file src/messenger/gnunet-service-messenger_util.c
+ * @brief GNUnet MESSENGER service
+ */
+
+#include "gnunet-service-messenger_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_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)
+{
+  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;
+}