path: root/src/transport/gnunet-transport.c

/*
     This file is part of GNUnet.
     (C) 2011 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 src/transport/gnunet-transport.c
 * @brief Tool to help configure, measure and control the transport subsystem.
 * @author Christian Grothoff
 * @author Nathan Evans
 *
 * This utility can be used to test if a transport mechanism for
 * GNUnet is properly configured.
 */

#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_resolver_service.h"
#include "gnunet_protocols.h"
#include "gnunet_transport_service.h"
#include "gnunet_nat_lib.h"

/**
 * How long do we wait for the NAT test to report success?
 * Should match NAT_SERVER_TIMEOUT in 'nat_test.c'.
 */
#define TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 60)
#define RESOLUTION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
#define OP_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)

/**
 * Benchmarking block size in KB
 */
#define BLOCKSIZE 4


/**
 * Which peer should we connect to?
 */
static char *cpid;

/**
 * Handle to transport service.
 */
static struct GNUNET_TRANSPORT_Handle *handle;

/**
 * Configuration handle
 */
static struct GNUNET_CONFIGURATION_Handle *cfg;

/**
 * Try_connect handle
 */
struct GNUNET_TRANSPORT_TryConnectHandle * tc_handle;

/**
 * Option -s.
 */
static int benchmark_send;

/**
 * Option -b.
 */
static int benchmark_receive;

/**
 * Option -l.
 */
static int benchmark_receive;

/**
 * Option -i.
 */
static int iterate_connections;

/**
 * Option -t.
 */
static int test_configuration;

/**
 * Option -c.
 */
static int monitor_connects;

/**
 * Option -m.
 */
static int monitor_connections;

/**
 * Option -C.
 */
static int try_connect;

/**
 * Option -n.
 */
static int numeric;

/**
 * Global return value (0 success).
 */
static int ret;

/**
 * Current number of connections in monitor mode
 */
static int monitor_connect_counter;

/**
 * Number of bytes of traffic we received so far.
 */
static unsigned long long traffic_received;

/**
 * Number of bytes of traffic we sent so far.
 */
static unsigned long long traffic_sent;

/**
 * Starting time of transmitting/receiving data.
 */
static struct GNUNET_TIME_Absolute start_time;

/**
 * Handle for current transmission request.
 */
static struct GNUNET_TRANSPORT_TransmitHandle *th;

/**
 *
 */
struct GNUNET_TRANSPORT_PeerIterateContext *pic;

/**
 * Identity of the peer we transmit to / connect to.
 * (equivalent to 'cpid' string).
 */
static struct GNUNET_PeerIdentity pid;

/**
 * Task scheduled for cleanup / termination of the process.
 */
static GNUNET_SCHEDULER_TaskIdentifier end;

/**
 * Task for operation timeout
 */
static GNUNET_SCHEDULER_TaskIdentifier op_timeout;


/**
 * Selected level of verbosity.
 */
static int verbosity;

/**
 * Resolver process handle.
 */
struct GNUNET_OS_Process *resolver;

/**
 * Number of tasks running that still need the resolver.
 */
static unsigned int resolver_users;

/**
 * Number of address resolutions pending
 */
static unsigned int address_resolutions;

/**
 * Address resolutions pending in progress
 */
static unsigned int address_resolution_in_progress;

/**
 * Context for a plugin test.
 */
struct TestContext
{

  /**
   * Handle to the active NAT test.
   */
  struct GNUNET_NAT_Test *tst;

  /**
   * Task identifier for the timeout.
   */
  GNUNET_SCHEDULER_TaskIdentifier tsk;

  /**
   * Name of plugin under test.
   */
  const char *name;

};


/**
 * Task run in monitor mode when the user presses CTRL-C to abort.
 * Stops monitoring activity.
 *
 * @param cls the 'struct GNUNET_TRANSPORT_PeerIterateContext *'
 * @param tc scheduler context
 */
static void
shutdown_task (void *cls,
               const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct GNUNET_TIME_Relative duration;
  end = GNUNET_SCHEDULER_NO_TASK;
  if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
  {
      GNUNET_SCHEDULER_cancel (op_timeout);
      op_timeout = GNUNET_SCHEDULER_NO_TASK;
  }
  if (NULL != tc_handle)
  {
      GNUNET_TRANSPORT_try_connect_cancel (tc_handle);
      tc_handle = NULL;
  }
  if (NULL != pic)
  {
      GNUNET_TRANSPORT_peer_get_active_addresses_cancel (pic);
      pic = NULL;
  }
  if (NULL != th)
  {
    GNUNET_TRANSPORT_notify_transmit_ready_cancel(th);
    th = NULL;
  }
  if (NULL != handle)
  {
    GNUNET_TRANSPORT_disconnect(handle);
    handle = NULL;
  }
  if (benchmark_send)
  {
    duration = GNUNET_TIME_absolute_get_duration (start_time);
    FPRINTF (stdout, _("Transmitted %llu bytes/s (%llu bytes in %s)\n"),
             1000LL * 1000LL * traffic_sent / (1 + duration.rel_value_us), traffic_sent,
             GNUNET_STRINGS_relative_time_to_string (duration, GNUNET_YES));
  }
  if (benchmark_receive)
  {
    duration = GNUNET_TIME_absolute_get_duration (start_time);
    FPRINTF (stdout, _("Received %llu bytes/s (%llu bytes in %s)\n"),
             1000LL * 1000LL * traffic_received / (1 + duration.rel_value_us),
             traffic_received,
             GNUNET_STRINGS_relative_time_to_string (duration, GNUNET_YES));
  }
}

struct ResolutionContext *rc_head;
struct ResolutionContext *rc_tail;

struct ResolutionContext
{
	struct ResolutionContext *next;
	struct ResolutionContext *prev;
  struct GNUNET_HELLO_Address *addrcp;
  struct GNUNET_TRANSPORT_AddressToStringContext *asc;
  int printed;
};


static void
operation_timeout (void *cls,
               const struct GNUNET_SCHEDULER_TaskContext *tc)
{
	struct ResolutionContext *cur;
	struct ResolutionContext *next;
  op_timeout = GNUNET_SCHEDULER_NO_TASK;
  if ((try_connect) || (benchmark_send) ||
  		(benchmark_receive))
  {
      FPRINTF (stdout, _("Failed to connect to `%s'\n"), GNUNET_i2s_full (&pid));
      if (GNUNET_SCHEDULER_NO_TASK != end)
        GNUNET_SCHEDULER_cancel (end);
      end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
      ret = 1;
      return;
  }
  if (iterate_connections)
  {
  		next = rc_head;
  		while (NULL != (cur = next))
  		{
  				next = cur->next;
  				FPRINTF (stdout, _("Failed to resolve address for peer `%s'\n"),
  						GNUNET_i2s (&cur->addrcp->peer));

  				GNUNET_CONTAINER_DLL_remove (rc_head, rc_tail, cur);
  				GNUNET_TRANSPORT_address_to_string_cancel (cur->asc);
  				GNUNET_free (cur->addrcp);
  				GNUNET_free (cur);

  		}
  		FPRINTF (stdout, "%s", _("Failed to list connections, timeout occured\n"));
      if (GNUNET_SCHEDULER_NO_TASK != end)
        GNUNET_SCHEDULER_cancel (end);
      end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
      ret = 1;
      return;
  }

}



/**
 * Display the result of the test.
 *
 * @param tc test context
 * @param result GNUNET_YES on success
 */
static void
display_test_result (struct TestContext *tc, int result)
{
  if (GNUNET_YES != result)
  {
    FPRINTF (stderr, "Configuration for plugin `%s' did not work!\n", tc->name);
  }
  else
  {
    FPRINTF (stderr, "Configuration for plugin `%s' is working!\n", tc->name);
  }
  if (GNUNET_SCHEDULER_NO_TASK != tc->tsk)
  {
    GNUNET_SCHEDULER_cancel (tc->tsk);
    tc->tsk = GNUNET_SCHEDULER_NO_TASK;
  }
  if (NULL != tc->tst)
  {
    GNUNET_NAT_test_stop (tc->tst);
    tc->tst = NULL;
  }
  GNUNET_free (tc);
  resolver_users--;
  if ((0 == resolver_users) && (NULL != resolver))
  {
    GNUNET_break (0 == GNUNET_OS_process_kill (resolver, SIGTERM));
    GNUNET_OS_process_destroy (resolver);
    resolver = NULL;
  }
}


/**
 * Function called by NAT on success.
 * Clean up and update GUI (with success).
 *
 * @param cls test context
 * @param success currently always GNUNET_OK
 */
static void
result_callback (void *cls, int success)
{
  struct TestContext *tc = cls;

  display_test_result (tc, success);
}


/**
 * Function called if NAT failed to confirm success.
 * Clean up and update GUI (with failure).
 *
 * @param cls test context
 * @param tc scheduler callback
 */
static void
fail_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct TestContext *tstc = cls;

  tstc->tsk = GNUNET_SCHEDULER_NO_TASK;
  display_test_result (tstc, GNUNET_NO);
}


/**
 * Test our plugin's configuration (NAT traversal, etc.).
 *
 * @param cfg configuration to test
 */
static void
do_test_configuration (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  char *plugins;
  char *tok;
  unsigned long long bnd_port;
  unsigned long long adv_port;
  struct TestContext *tc;

  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_string (cfg, "transport", "plugins",
                                             &plugins))
  {
    FPRINTF (stderr,
             "%s",
	     _
             ("No transport plugins configured, peer will never communicate\n"));
    ret = 4;
    return;
  }
  for (tok = strtok (plugins, " "); tok != NULL; tok = strtok (NULL, " "))
  {
    char section[12 + strlen (tok)];

    GNUNET_snprintf (section, sizeof (section), "transport-%s", tok);
    if (GNUNET_OK !=
        GNUNET_CONFIGURATION_get_value_number (cfg, section, "PORT", &bnd_port))
    {
      FPRINTF (stderr,
               _("No port configured for plugin `%s', cannot test it\n"), tok);
      continue;
    }
    if (GNUNET_OK !=
        GNUNET_CONFIGURATION_get_value_number (cfg, section, "ADVERTISED_PORT",
                                               &adv_port))
      adv_port = bnd_port;
    if (NULL == resolver)
      resolver =
	  GNUNET_OS_start_process (GNUNET_YES, GNUNET_OS_INHERIT_STD_OUT_AND_ERR, NULL, NULL, "gnunet-service-resolver",
                                   "gnunet-service-resolver", NULL);
    resolver_users++;
    GNUNET_RESOLVER_connect (cfg);
    tc = GNUNET_malloc (sizeof (struct TestContext));
    tc->name = GNUNET_strdup (tok);
    tc->tst =
        GNUNET_NAT_test_start (cfg,
                               (0 ==
                                strcasecmp (tok,
                                            "udp")) ? GNUNET_NO : GNUNET_YES,
                               (uint16_t) bnd_port, (uint16_t) adv_port,
                               &result_callback, tc);
    if (NULL == tc->tst)
    {
      display_test_result (tc, GNUNET_SYSERR);
      continue;
    }
    tc->tsk = GNUNET_SCHEDULER_add_delayed (TIMEOUT, &fail_timeout, tc);
  }
  GNUNET_free (plugins);
}

/**
 * Function called to notify a client about the socket
 * begin ready to queue more data.  "buf" will be
 * NULL and "size" zero if the socket was closed for
 * writing in the meantime.
 *
 * @param cls closure
 * @param size number of bytes available in buf
 * @param buf where the callee should write the message
 * @return number of bytes written to buf
 */
static size_t
transmit_data (void *cls, size_t size, void *buf)
{
  struct GNUNET_MessageHeader *m = buf;

  if ((NULL == buf) && (0 == size))
  {
    th = NULL;
    return 0;
  }

  GNUNET_assert (size >= sizeof (struct GNUNET_MessageHeader));
  GNUNET_assert (size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
  m->size = ntohs (size);
  m->type = ntohs (GNUNET_MESSAGE_TYPE_DUMMY);
  memset (&m[1], 52, size - sizeof (struct GNUNET_MessageHeader));
  traffic_sent += size;
  th = GNUNET_TRANSPORT_notify_transmit_ready (handle, &pid, BLOCKSIZE * 1024, 0,
                                               GNUNET_TIME_UNIT_FOREVER_REL,
                                               &transmit_data, NULL);
  if (verbosity > 0)
    FPRINTF (stdout, _("Transmitting %u bytes to %s\n"), (unsigned int) size,
             GNUNET_i2s (&pid));
  return size;
}


/**
 * Function called to notify transport users that another
 * peer connected to us.
 *
 * @param cls closure
 * @param peer the peer that connected
 */
static void
notify_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
{
  if (0 != memcmp (&pid, peer, sizeof (struct GNUNET_PeerIdentity)))
    return;
  ret = 0;
  if (try_connect)
  {
      /* all done, terminate instantly */
      FPRINTF (stdout, 
	       _("Successfully connected to `%s'\n"), 
	       GNUNET_i2s_full (peer));
      ret = 0;

      if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
      {
        GNUNET_SCHEDULER_cancel (op_timeout);
        op_timeout = GNUNET_SCHEDULER_NO_TASK;
      }

      if (GNUNET_SCHEDULER_NO_TASK != end)
        GNUNET_SCHEDULER_cancel (end);
      end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
      return;
  }
  if (benchmark_send)
  {
    if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
    {
      GNUNET_SCHEDULER_cancel (op_timeout);
      op_timeout = GNUNET_SCHEDULER_NO_TASK;
    }
    if (verbosity > 0)
      FPRINTF (stdout, _("Successfully connected to `%s', starting to send benchmark data in %u Kb blocks\n"),
          GNUNET_i2s (&pid), BLOCKSIZE);
    start_time = GNUNET_TIME_absolute_get ();
    if (NULL == th)
      th = GNUNET_TRANSPORT_notify_transmit_ready (handle, peer,
                                                   BLOCKSIZE * 1024, 0,
                                                   GNUNET_TIME_UNIT_FOREVER_REL,
                                                   &transmit_data, NULL);
    else
      GNUNET_break (0);
    return;
  }
}


/**
 * Function called to notify transport users that another
 * peer disconnected from us.
 *
 * @param cls closure
 * @param peer the peer that disconnected
 */
static void
notify_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
{
  if (0 != memcmp (&pid, peer, sizeof (struct GNUNET_PeerIdentity)))
    return;

  if (NULL != th)
  {
    GNUNET_TRANSPORT_notify_transmit_ready_cancel (th);
    th = NULL;
  }
  if (benchmark_send)
  {
      FPRINTF (stdout, _("Disconnected from peer `%s' while benchmarking\n"), GNUNET_i2s (&pid));
      if (GNUNET_SCHEDULER_NO_TASK != end)
        GNUNET_SCHEDULER_cancel (end);
      return;
  }
}

/**
 * Function called to notify transport users that another
 * peer connected to us.
 *
 * @param cls closure
 * @param peer the peer that connected
 */
static void
monitor_notify_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
{
  monitor_connect_counter ++;
  struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get();
  const char *now_str = GNUNET_STRINGS_absolute_time_to_string (now);

  FPRINTF (stdout, _("%24s: %-17s %4s   (%u connections in total)\n"),
           now_str,
           _("Connected to"),
           GNUNET_i2s (peer),
           monitor_connect_counter);
}


/**
 * Function called to notify transport users that another
 * peer disconnected from us.
 *
 * @param cls closure
 * @param peer the peer that disconnected
 */
static void
monitor_notify_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
{
  struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get();
  const char *now_str = GNUNET_STRINGS_absolute_time_to_string (now);

  GNUNET_assert (monitor_connect_counter > 0);
  monitor_connect_counter --;

  FPRINTF (stdout, _("%24s: %-17s %4s   (%u connections in total)\n"),
           now_str,
           _("Disconnected from"),
           GNUNET_i2s (peer),
           monitor_connect_counter);
}



/**
 * Function called by the transport for each received message.
 *
 * @param cls closure
 * @param peer (claimed) identity of the other peer
 * @param message the message
 */
static void
notify_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
                const struct GNUNET_MessageHeader *message)
{
  if (benchmark_receive)
  {
    if (GNUNET_MESSAGE_TYPE_DUMMY != ntohs (message->type))
      return;
    if (verbosity > 0)
      FPRINTF (stdout, _("Received %u bytes from %s\n"),
               (unsigned int) ntohs (message->size), GNUNET_i2s (peer));

    if (traffic_received == 0)
      start_time = GNUNET_TIME_absolute_get ();
    traffic_received += ntohs (message->size);
    return;
  }
}


static void resolve_address (const struct GNUNET_HELLO_Address *address,
														 int numeric);


static void
process_string (void *cls, const char *address)
{
  struct ResolutionContext *rc = cls;
  struct GNUNET_HELLO_Address *addrcp = rc->addrcp;

  if (address != NULL)
  {
    FPRINTF (stdout, _("Peer `%s': %s %s\n"), GNUNET_i2s (&addrcp->peer), addrcp->transport_name, address);
    rc->printed = GNUNET_YES;
  }
  else
  {
    /* done */
    GNUNET_assert (address_resolutions > 0);
    address_resolutions --;
    if (GNUNET_NO == rc->printed)
    {
    	if (numeric == GNUNET_NO)
    	{
    		resolve_address (rc->addrcp, GNUNET_YES ); /* Failed to resolve address, try numeric lookup */
    	}
    	else
      	FPRINTF (stdout, _("Peer `%s': %s <unable to resolve address>\n"), GNUNET_i2s (&addrcp->peer), addrcp->transport_name);
    }
    GNUNET_free (rc->addrcp);
    GNUNET_CONTAINER_DLL_remove (rc_head, rc_tail, rc);
    GNUNET_free (rc);
    if ((0 == address_resolutions) && (iterate_connections))
    {
        if (GNUNET_SCHEDULER_NO_TASK != end)
        {
          GNUNET_SCHEDULER_cancel (end);
          end = GNUNET_SCHEDULER_NO_TASK;
        }
        if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
        {
        	GNUNET_SCHEDULER_cancel (op_timeout);
        	op_timeout = GNUNET_SCHEDULER_NO_TASK;
        }
        ret = 0;
        end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
    }
  }
}

static void resolve_address (const struct GNUNET_HELLO_Address *address,
														 int numeric)
{
  struct ResolutionContext *rc;

  rc = GNUNET_malloc(sizeof (struct ResolutionContext));
  GNUNET_assert (NULL != rc);
  GNUNET_CONTAINER_DLL_insert (rc_head, rc_tail, rc);
  address_resolutions ++;

  rc->addrcp = GNUNET_HELLO_address_copy(address);
  rc->printed = GNUNET_NO;
  /* Resolve address to string */
  rc->asc = GNUNET_TRANSPORT_address_to_string (cfg, address, numeric,
                                      RESOLUTION_TIMEOUT, &process_string,
                                      rc);
}

/**
 * Function to call with a binary address
 *
 * @param cls closure
 * @param peer identity of the peer
 * @param address binary address (NULL on disconnect)
 */
static void
process_address (void *cls, const struct GNUNET_PeerIdentity *peer,
                 const struct GNUNET_HELLO_Address *address)
{
  if (peer == NULL)
  {
    /* done */
    address_resolution_in_progress = GNUNET_NO;
    pic = NULL;
    if (GNUNET_SCHEDULER_NO_TASK != end)
      GNUNET_SCHEDULER_cancel (end);
    end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
    return;
  }
  if (address == NULL)
  {
    FPRINTF (stdout, _("Peer `%s' disconnected\n"), GNUNET_i2s (peer));
    return;
  }

  if (GNUNET_SCHEDULER_NO_TASK != op_timeout)
  	GNUNET_SCHEDULER_cancel (op_timeout);
  op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT,
                                             &operation_timeout, NULL);

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received address for peer `%s': %s\n",
  		GNUNET_i2s (peer), address->transport_name);
  resolve_address (address, numeric);
}

void try_connect_cb (void *cls,
                     const int result)
{
  static int retries = 0;
  if (GNUNET_OK == result)
  {
      tc_handle = NULL;
      return;
  }
  retries ++;
  if (retries < 10)
    tc_handle = GNUNET_TRANSPORT_try_connect (handle, &pid, try_connect_cb, NULL);
  else
  {
    FPRINTF (stderr, "%s", _("Failed to send connect request to transport service\n"));
    if (GNUNET_SCHEDULER_NO_TASK != end)
      GNUNET_SCHEDULER_cancel (end);
    ret = 1;
    end = GNUNET_SCHEDULER_add_now (&shutdown_task, NULL);
    return;
  }
}


/**
 * Function called with the result of the check if the 'transport'
 * service is running.
 *
 * @param cls closure with our configuration
 * @param result GNUNET_YES if transport is running
 */
static void
testservice_task (void *cls,
                  int result)
{
  int counter = 0;
  ret = 1;

  if (GNUNET_YES != result)
  {
    FPRINTF (stderr, 
	     _("Service `%s' is not running\n"), "transport");
    return;
  }

  if ( (NULL != cpid) && 
       (GNUNET_OK != GNUNET_CRYPTO_ecc_public_sign_key_from_string (cpid,
								    strlen (cpid),
								    &pid.public_key)))
  {
    FPRINTF (stderr, _("Failed to parse peer identity `%s'\n"), cpid);
    return;
  }

  counter = benchmark_send + benchmark_receive + iterate_connections +
            monitor_connections + monitor_connects + try_connect;

  if (1 < counter)
  {
    FPRINTF (stderr, _("Multiple operations given. Please choose only one operation: %s, %s, %s, %s, %s, %s\n"),
             "connect", "benchmark send", "benchmark receive", "information", "monitor", "events");
    return;
  }
  if (0 == counter)
  {
    FPRINTF (stderr, _("No operation given. Please choose one operation: %s, %s, %s, %s, %s, %s\n"),
             "connect", "benchmark send", "benchmark receive", "information", "monitor", "events");
    return;
  }

  if (try_connect) /* -C: Connect to peer */
  {
    if (NULL == cpid)
    {
      FPRINTF (stderr, _("Option `%s' makes no sense without option `%s'.\n"),
               "-C", "-p");
      ret = 1;
      return;
    }
    handle = GNUNET_TRANSPORT_connect (cfg, NULL, NULL,
                                       &notify_receive,
                                       &notify_connect,
                                       &notify_disconnect);
    if (NULL == handle)
    {
        FPRINTF (stderr, "%s", _("Failed to connect to transport service\n"));
        ret = 1;
        return;
    }
    tc_handle = GNUNET_TRANSPORT_try_connect (handle, &pid, try_connect_cb, NULL);
    if (NULL == tc_handle)
    {
        FPRINTF (stderr, "%s", _("Failed to send request to transport service\n"));
        ret = 1;
        return;
    }
    op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT,
                                               &operation_timeout, NULL);

  }
  else if (benchmark_send) /* -s: Benchmark sending */
  {
    if (NULL == cpid)
    {
      FPRINTF (stderr, _("Option `%s' makes no sense without option `%s'.\n"),
               "-s", "-p");
      ret = 1;
      return;
    }
    handle = GNUNET_TRANSPORT_connect (cfg, NULL, NULL,
                                       &notify_receive,
                                       &notify_connect,
                                       &notify_disconnect);
    if (NULL == handle)
    {
        FPRINTF (stderr, "%s", _("Failed to connect to transport service\n"));
        ret = 1;
        return;
    }
    tc_handle =  GNUNET_TRANSPORT_try_connect (handle, &pid, try_connect_cb, NULL);
    if (NULL == tc_handle)
    {
        FPRINTF (stderr, "%s", _("Failed to send request to transport service\n"));
        ret = 1;
        return;
    }
    start_time = GNUNET_TIME_absolute_get ();
    op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT,
                                               &operation_timeout, NULL);
  }
  else if (benchmark_receive) /* -b: Benchmark receiving */
  {
    handle =
        GNUNET_TRANSPORT_connect (cfg, NULL, NULL, &notify_receive,
                                  NULL, NULL);
    if (NULL == handle)
    {
        FPRINTF (stderr, "%s", _("Failed to connect to transport service\n"));
        ret = 1;
        return;
    }
    if (verbosity > 0)
      FPRINTF (stdout, "%s", _("Starting to receive benchmark data\n"));
    start_time = GNUNET_TIME_absolute_get ();

  }
  else if (iterate_connections) /* -i: List all active addresses once */
  {
    address_resolution_in_progress = GNUNET_YES;
    pic = GNUNET_TRANSPORT_peer_get_active_addresses (cfg,
                                                (NULL == cpid) ? NULL : &pid,
                                                GNUNET_YES,
                                                TIMEOUT,
                                                &process_address, (void *) cfg);
    op_timeout = GNUNET_SCHEDULER_add_delayed (OP_TIMEOUT,
                                               &operation_timeout, NULL);
  }
  else if (monitor_connections) /* -m: List all active addresses continously */
  {
    address_resolution_in_progress = GNUNET_YES;
    pic = GNUNET_TRANSPORT_peer_get_active_addresses (cfg,
                                                (NULL == cpid) ? NULL : &pid,
                                                GNUNET_NO,
                                                TIMEOUT,
                                                &process_address, (void *) cfg);
  }
  else if (monitor_connects) /* -e : Monitor (dis)connect events continously */
  {
    monitor_connect_counter = 0;
    handle = GNUNET_TRANSPORT_connect (cfg, NULL, NULL, NULL,
                                       &monitor_notify_connect,
                                       &monitor_notify_disconnect);
    if (NULL == handle)
    {
      FPRINTF (stderr, "%s", _("Failed to connect to transport service\n"));
      ret = 1;
      return;
    }
    ret = 0;
  }
  else
  {
    GNUNET_break (0);
    return;
  }

  end = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
                                      &shutdown_task,
                                      NULL);

}


/**
 * Main function that will be run by the scheduler.
 *
 * @param cls closure
 * @param args remaining command-line arguments
 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
 * @param mycfg configuration
 */
static void
run (void *cls, char *const *args, const char *cfgfile,
     const struct GNUNET_CONFIGURATION_Handle *mycfg)
{
	cfg = (struct GNUNET_CONFIGURATION_Handle *) mycfg;
	if (test_configuration)
  {
    do_test_configuration (cfg);
    return;
  }
  GNUNET_CLIENT_service_test ("transport", cfg,
			      GNUNET_TIME_UNIT_SECONDS,
			      &testservice_task,
			      (void *) cfg);
}


int
main (int argc, char *const *argv)
{
  int res;
  static const struct GNUNET_GETOPT_CommandLineOption options[] = {
    {'b', "benchmark", NULL,
     gettext_noop ("measure how fast we are receiving data from all peers (until CTRL-C)"),
     0, &GNUNET_GETOPT_set_one, &benchmark_receive},
    {'C', "connect", NULL,
     gettext_noop ("connect to a peer"),
     0, &GNUNET_GETOPT_set_one, &try_connect},
    {'i', "information", NULL,
     gettext_noop ("provide information about all current connections (once)"),
     0, &GNUNET_GETOPT_set_one, &iterate_connections},
    {'m', "monitor", NULL,
     gettext_noop ("provide information about all current connections (continuously)"),
     0, &GNUNET_GETOPT_set_one, &monitor_connections},
    {'e', "events", NULL,
     gettext_noop ("provide information about all connects and disconnect events (continuously)"),
     0, &GNUNET_GETOPT_set_one, &monitor_connects},
    {'n', "numeric", NULL,
     gettext_noop ("do not resolve hostnames"),
     0, &GNUNET_GETOPT_set_one, &numeric},
     {'p', "peer", "PEER",
      gettext_noop ("peer identity"),
      1, &GNUNET_GETOPT_set_string, &cpid},
    {'s', "send", NULL,
     gettext_noop
     ("send data for benchmarking to the other peer (until CTRL-C)"),
     0, &GNUNET_GETOPT_set_one, &benchmark_send},
    {'t', "test", NULL,
     gettext_noop ("test transport configuration (involves external server)"),
     0, &GNUNET_GETOPT_set_one, &test_configuration},
    GNUNET_GETOPT_OPTION_VERBOSE (&verbosity),
    GNUNET_GETOPT_OPTION_END
  };

  if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
    return 2;

  res = GNUNET_PROGRAM_run (argc, argv, "gnunet-transport",
                              gettext_noop
                              ("Direct access to transport service."), options,
                              &run, NULL);
  GNUNET_free ((void *) argv);
  if (GNUNET_OK == res)
    return ret;
  return 1;
}


/* end of gnunet-transport.c */