gnunet-dht-get.c

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/*
     This file is part of GNUnet.
     Copyright (C) 2001, 2002, 2004, 2005, 2006, 2007, 2009, 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 unsigned int query_type;
 
static unsigned int replication = 5;
 
static char *query_key;
 
static int raw_key;
 
static struct GNUNET_TIME_Relative timeout_request = { 60 * 1000 * 1000 };
 
static unsigned int verbose;
 
static int demultixplex_everywhere;
 
static int record_route;
 
static struct GNUNET_DHT_Handle *dht_handle;
 
static const struct GNUNET_CONFIGURATION_Handle *cfg;
 
static struct GNUNET_DHT_GetHandle *get_handle;
 
static unsigned int result_count;
 
static int ret;
 
static struct GNUNET_SCHEDULER_Task *tt;
 
 
static void
cleanup_task (void *cls)
{
  if (NULL != get_handle)
  {
    GNUNET_DHT_get_stop (get_handle);
    get_handle = NULL;
  }
  if (NULL != dht_handle)
  {
    GNUNET_DHT_disconnect (dht_handle);
    dht_handle = NULL;
  }
  if (NULL != tt)
  {
    GNUNET_SCHEDULER_cancel (tt);
    tt = NULL;
  }
}
 
 
static void
timeout_task (void *cls)
{
  tt = NULL;
  GNUNET_SCHEDULER_shutdown ();
}
 
 
static void
get_result_iterator (void *cls,
                     struct GNUNET_TIME_Absolute exp,
                     const struct GNUNET_HashCode *key,
                     const struct GNUNET_PeerIdentity *trunc_peer,
                     const struct GNUNET_DHT_PathElement *get_path,
                     unsigned int get_path_length,
                     const struct GNUNET_DHT_PathElement *put_path,
                     unsigned int put_path_length,
                     enum GNUNET_BLOCK_Type type,
                     size_t size,
                     const void *data)
{
  fprintf (stdout,
           (GNUNET_BLOCK_TYPE_TEST == type)
           ? _ ("Result %d, type %d:\n%.*s\n")
           : _ ("Result %d, type %d:\n"),
           result_count,
           type,
           (int) size,
           (char *) data);
  if (record_route && verbose)
  {
    {
      struct GNUNET_PeerIdentity my_identity;
 
      GNUNET_break (GNUNET_OK ==
                    GNUNET_CRYPTO_get_peer_identity (cfg,
                                                     &my_identity));
      GNUNET_break (0 ==
                    GNUNET_DHT_verify_path (data,
                                            size,
                                            exp,
                                            trunc_peer,
                                            put_path,
                                            put_path_length,
                                            get_path,
                                            get_path_length,
                                            &my_identity));
    }
    fprintf (stdout,
             "  GET path: ");
    for (unsigned int i = 0; i < get_path_length; i++)
      fprintf (stdout,
               "%s%s",
               (0 == i) ? "" : "-",
               GNUNET_i2s (&get_path[i].pred));
    fprintf (stdout,
             "\n  PUT path: ");
    for (unsigned int i = 0; i < put_path_length; i++)
      fprintf (stdout,
               "%s%s",
               (0 == i) ? "" : "-",
               GNUNET_i2s (&put_path[i].pred));
    if (NULL != trunc_peer)
      fprintf (stdout,
               "!%s",
               GNUNET_i2s (trunc_peer));
    fprintf (stdout,
             "\n");
  }
  result_count++;
}
 
 
static void
run (void *cls,
     char *const *args,
     const char *cfgfile,
     const struct GNUNET_CONFIGURATION_Handle *c)
{
  struct GNUNET_HashCode key;
  enum GNUNET_DHT_RouteOption ro;
 
  cfg = c;
  if (NULL == query_key)
  {
    fprintf (stderr,
             "%s",
             _ ("Must provide key for DHT GET!\n"));
    ret = 1;
    return;
  }
  /* Resolve the key before connecting, so that a bad key does not leak
     the DHT handle. */
  if (raw_key)
  {
    if (GNUNET_OK !=
        GNUNET_CRYPTO_hash_from_string (query_key,
                                        &key))
    {
      fprintf (stderr,
               _ ("`%s' is not a valid key\n"),
               query_key);
      ret = 1;
      return;
    }
  }
  else
  {
    GNUNET_CRYPTO_hash (query_key,
                        strlen (query_key),
                        &key);
  }
  if (NULL == (dht_handle = GNUNET_DHT_connect (cfg, 1)))
  {
    fprintf (stderr,
             "%s",
             _ ("Failed to connect to DHT service!\n"));
    ret = 1;
    return;
  }
  if (query_type == GNUNET_BLOCK_TYPE_ANY) /* Type of data not set */
    query_type = GNUNET_BLOCK_TYPE_TEST;
  if (verbose)
    fprintf (stderr,
             "%s `%s' \n",
             _ ("Issuing DHT GET with key"),
             GNUNET_h2s_full (&key));
  GNUNET_SCHEDULER_add_shutdown (&cleanup_task, NULL);
  tt = GNUNET_SCHEDULER_add_delayed (timeout_request, &timeout_task, NULL);
  ro = GNUNET_DHT_RO_NONE;
  if (demultixplex_everywhere)
    ro |= GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE;
  if (record_route)
    ro |= GNUNET_DHT_RO_RECORD_ROUTE;
  get_handle = GNUNET_DHT_get_start (dht_handle,
                                     query_type,
                                     &key,
                                     replication,
                                     ro,
                                     NULL,
                                     0,
                                     &get_result_iterator,
                                     NULL);
}
 
 
int
main (int argc, char *const *argv)
{
  struct GNUNET_GETOPT_CommandLineOption options[] = {
    GNUNET_GETOPT_option_string (
      'k',
      "key",
      "KEY",
      gettext_noop (
        "the string to hash into the query key (see -K to give the key itself)")
      ,
      &query_key),
    GNUNET_GETOPT_option_flag (
      'K',
      "raw-key",
      gettext_noop (
        "interpret -k as the query key itself, in the base32 form GNUnet prints it, instead of hashing it"),
      &raw_key),
    GNUNET_GETOPT_option_uint (
      'r',
      "replication",
      "LEVEL",
      gettext_noop ("how many parallel requests (replicas) to create"),
      &replication),
    GNUNET_GETOPT_option_flag (
      'R',
      "record",
      gettext_noop ("use DHT's record route option"),
      &record_route),
    GNUNET_GETOPT_option_uint (
      't',
      "type",
      "TYPE",
      gettext_noop ("the type of data to look for"),
      &query_type),
    GNUNET_GETOPT_option_relative_time (
      'T',
      "timeout",
      "TIMEOUT",
      gettext_noop ("how long to execute this query before giving up?"),
      &timeout_request),
    GNUNET_GETOPT_option_flag (
      'x',
      "demultiplex",
      gettext_noop (
        "use DHT's demultiplex everywhere option"),
      &demultixplex_everywhere),
    GNUNET_GETOPT_option_verbose (&verbose),
    GNUNET_GETOPT_OPTION_END
  };
 
 
  ret = (GNUNET_OK ==
         GNUNET_PROGRAM_run (
           GNUNET_OS_project_data_gnunet (),
           argc,
           argv,
           "gnunet-dht-get",
           gettext_noop (
             "Issue a GET request to the GNUnet DHT, prints results."),
           options,
           &run,
           NULL))
         ? ret
         : 1;
  return ret;
}
 
 
/* end of gnunet-dht-get.c */