gnunet-dht-hello.c

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/*
     This file is part of GNUnet.
     Copyright (C) 2022 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 "gnunet_dht_service.h"
 
#define LOG(kind, ...) GNUNET_log_from (kind, "dht-clients", __VA_ARGS__)
 
static struct GNUNET_DHT_Handle *dht_handle;
 
static struct GNUNET_DHT_HelloGetHandle *get_hello_handle;
 
static int global_ret;
 
 
static void
cleanup_task (void *cls)
{
  if (NULL != get_hello_handle)
  {
    GNUNET_DHT_hello_get_cancel (get_hello_handle);
    get_hello_handle = NULL;
  }
  if (NULL != dht_handle)
  {
    GNUNET_DHT_disconnect (dht_handle);
    dht_handle = NULL;
  }
}
 
 
static void
hello_done_cb (void *cls)
{
  GNUNET_SCHEDULER_shutdown ();
}
 
 
static void
hello_result_cb (void *cls,
                 const char *url)
{
  get_hello_handle = NULL;
  fprintf (stdout,
           "%s\n",
           url);
  GNUNET_SCHEDULER_shutdown ();
}
 
 
static void
run (void *cls,
     char *const *args,
     const char *cfgfile,
     const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  (void) cls;
  (void) cfgfile;
  GNUNET_SCHEDULER_add_shutdown (&cleanup_task,
                                 NULL);
  if (NULL == (dht_handle = GNUNET_DHT_connect (cfg,
                                                1)))
  {
    fprintf (stderr,
             _ ("Failed to connect to DHT service!\n"));
    global_ret = EXIT_NOTCONFIGURED;
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  if (NULL == args[0])
  {
    get_hello_handle = GNUNET_DHT_hello_get (dht_handle,
                                             &hello_result_cb,
                                             NULL);
    GNUNET_break (NULL != get_hello_handle);
  }
  else
  {
    GNUNET_DHT_hello_offer (dht_handle,
                            args[0],
                            &hello_done_cb,
                            NULL);
  }
}
 
 
int
main (int argc,
      char *const *argv)
{
  struct GNUNET_GETOPT_CommandLineOption options[] = {
    GNUNET_GETOPT_OPTION_END
  };
  enum GNUNET_GenericReturnValue iret;
 
  if (GNUNET_OK !=
      GNUNET_STRINGS_get_utf8_args (argc, argv,
                                    &argc, &argv))
    return 2;
  iret = GNUNET_PROGRAM_run (
    argc,
    argv,
    "gnunet-dht-hello [URL]",
    gettext_noop (
      "Obtain HELLO from DHT or provide HELLO to DHT for bootstrapping"),
    options,
    &run,
    NULL);
  if (GNUNET_SYSERR == iret)
    return EXIT_FAILURE;
  if (GNUNET_NO == iret)
    return EXIT_SUCCESS;
  return global_ret;
}
 
 
/* end of gnunet-dht-hello.c */