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/*
     This file is part of GNUnet.
     (C) 2009 Christian Grothoff (and other contributing authors)

     GNUnet is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 3, 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
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/
/**
 * @file transport/test_plugin_transport.c
 * @brief testcase for transport_api.c
 * @author Sailor Siraj
 * @author Christian Grothoff
 */

#include "platform.h"
#include "gnunet_constants.h"
#include "gnunet_util_lib.h"
#include "gnunet_hello_lib.h"
#include "gnunet_peerinfo_service.h"
#include "gnunet_protocols.h"
#include "gnunet_signatures.h"
#include "gnunet_transport_plugin.h"
#include "transport.h"

#define VERBOSE GNUNET_NO

/**
 * How long until we give up on transmitting the message?
 */
#define TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)

/**
 * Our public key.
 */
static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;

/**
 * Our identity.
 */
static struct GNUNET_PeerIdentity my_identity;

/**
 * Our private key.
 */
static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;

/**
 * Our configuration.
 */
const struct GNUNET_CONFIGURATION_Handle *cfg;

/**
 * Number of neighbours we'd like to have.
 */
static uint32_t max_connect_per_transport;

/**
 * Environment for this plugin.
 */
struct GNUNET_TRANSPORT_PluginEnvironment env;

/**
 *handle for the api provided by this plugin
 */
struct GNUNET_TRANSPORT_PluginFunctions *api;

/**
 * Did the test pass or fail?
 */
static int ok;

/**
 */
static void
receive (void *cls, const struct GNUNET_PeerIdentity *peer,
         const struct GNUNET_MessageHeader *message, uint32_t distance,
         const char *sender_address, size_t sender_address_len)
{
  /* do nothing */
}

void
notify_address (void *cls, const char *name, const void *addr, size_t addrlen,
                struct GNUNET_TIME_Relative expires)
{
}

/**
 * Function called when the service shuts
 * down.  Unloads our plugins.
 *
 * @param cls closure
 * @param cfg configuration to use
 */
static void
unload_plugins (void *cls, const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  GNUNET_assert (NULL ==
                 GNUNET_PLUGIN_unload ("libgnunet_plugin_transport_tcp", api));
  if (my_private_key != NULL)
    GNUNET_CRYPTO_rsa_key_free (my_private_key);

}


static void
unload_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct GNUNET_CONFIGURATION_Handle *cfg = cls;

  unload_plugins (NULL, cfg);
}


/**
 * Simple example test that invokes
 * the "validate" function of the plugin
 * and tries to see if the plugin would
 * succeed to validate its own address.
 * (This test is not well-written since
 *  we hand-compile the address which
 *  kind-of works for TCP but would not
 *  work for other plugins; we should ask
 *  the plugin about its address instead...).
 */
/* FIXME: this is TCP/UDP-specific and won't work
   for HTTP/SMTP/DV; we should instead use an
   address that we get from the plugin itself
   (if it is willing/able to give us one...) */
static void
test_validation ()
{
  struct sockaddr_in soaddr;

  memset (&soaddr, 0, sizeof (soaddr));
#if HAVE_SOCKADDR_IN_SIN_LEN
  soaddr.sin_len = sizeof (soaddr);
#endif
  soaddr.sin_family = AF_INET;
  soaddr.sin_port = htons (2368 /* FIXME: get from config! */ );
  soaddr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
  GNUNET_assert (GNUNET_OK ==
                 api->check_address (api->cls, &soaddr, sizeof (soaddr)));
  ok = 0;
  GNUNET_SCHEDULER_add_continuation (&unload_task, (void *) cfg,
                                     GNUNET_SCHEDULER_REASON_PREREQ_DONE);
}


static void
setup_plugin_environment ()
{
  env.cfg = cfg;
  env.my_identity = &my_identity;
  env.cls = &env;
  env.receive = &receive;
  env.notify_address = &notify_address;
  env.max_connections = max_connect_per_transport;
}


/**
 * Runs the test.
 *
 * @param cls closure
 * @param c configuration to use
 */
static void
run (void *cls, char *const *args, const char *cfgfile,
     const struct GNUNET_CONFIGURATION_Handle *c)
{
  unsigned long long tneigh;
  char *keyfile;
  char *libname;

  cfg = c;
  /* parse configuration */
  if ((GNUNET_OK !=
       GNUNET_CONFIGURATION_get_value_number (c, "TRANSPORT", "NEIGHBOUR_LIMIT",
                                              &tneigh)) ||
      (GNUNET_OK !=
       GNUNET_CONFIGURATION_get_value_filename (c, "GNUNETD", "HOSTKEY",
                                                &keyfile)))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _
                ("Transport service is lacking key configuration settings.  Exiting.\n"));
    GNUNET_SCHEDULER_shutdown (s);
    return;
  }
  max_connect_per_transport = (uint32_t) tneigh;
  my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
  GNUNET_free (keyfile);
  if (my_private_key == NULL)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _("Transport service could not access hostkey.  Exiting.\n"));
    GNUNET_SCHEDULER_shutdown (s);
    return;
  }
  GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
  GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
                      &my_identity.hashPubKey);



  /* load plugins... */
  setup_plugin_environment ();
  GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Loading tcp transport plugin\n"));
  GNUNET_asprintf (&libname, "libgnunet_plugin_transport_tcp");

  api = GNUNET_PLUGIN_load (libname, &env);
  GNUNET_free (libname);
  if (api == NULL)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _("Failed to load transport plugin for tcp\n"));
    /* FIXME: set some error code for main */
    return;
  }
  test_validation ();
}


/**
 * The main function for the transport service.
 *
 * @param argc number of arguments from the command line
 * @param argv command line arguments
 * @return 0 ok, 1 on error
 */
int
main (int argc, char *const *argv)
{
  static struct GNUNET_GETOPT_CommandLineOption options[] = {
    GNUNET_GETOPT_OPTION_END
  };
  int ret;

  char *const argv_prog[] = {
    "test_plugin_transport",
    "-c",
    "test_plugin_transport_data.conf",
    "-L",
#if VERBOSE
    "DEBUG",
#else
    "WARNING",
#endif
    NULL
  };
  GNUNET_log_setup ("test-plugin-transport",
#if VERBOSE
                    "DEBUG",
#else
                    "WARNING",
#endif
                    NULL);
  ok = 1;                       /* set to fail */
  ret =
      (GNUNET_OK ==
       GNUNET_PROGRAM_run (5, argv_prog, "test-plugin-transport", "testcase",
                           options, &run, NULL)) ? ok : 1;
  GNUNET_DISK_directory_remove ("/tmp/test-gnunetd-plugin-transport");
  return ret;
}

/* end of test_plugin_transport.c */