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/*
     This file is part of GNUnet.
     Copyright (C) 2009, 2012, 2013 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
*/

/**
 * @file arm/gnunet-arm.c
 * @brief arm for writing a tool
 * @author Christian Grothoff
 */
#include "platform.h"
#include "gnunet_arm_service.h"
#include "gnunet_constants.h"
#include "gnunet_util_lib.h"

/**
 * Set if we are to shutdown all services (including ARM).
 */
static int end;

/**
 * Set if we are to start default services (including ARM).
 */
static int start;

/**
 * Set if we are to stop/start default services (including ARM).
 */
static int restart;

/**
 * Set if we should delete configuration and temp directory on exit.
 */
static int delete;

/**
 * Set if we should not print status messages.
 */
static int quiet;

/**
 * Monitor ARM activity.
 */
static int monitor;

/**
 * Set if we should print a list of currently running services.
 */
static int list;

/**
 * Set to the name of a service to start.
 */
static char *init;

/**
 * Set to the name of a service to kill.
 */
static char *term;

/**
 * Set to the name of the config file used.
 */
static char *config_file;

/**
 * Set to the directory where runtime files are stored.
 */
static char *dir;

/**
 * Final status code.
 */
static int ret;

/**
 * Connection with ARM.
 */
static struct GNUNET_ARM_Handle *h;

/**
 * Monitor connection with ARM.
 */
static struct GNUNET_ARM_MonitorHandle *m;

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

/**
 * Processing stage that we are in.  Simple counter.
 */
static unsigned int phase;

/**
 * User defined timestamp for completing operations.
 */
static struct GNUNET_TIME_Relative timeout;

/**
 * Task to be run on timeout.
 */
static struct GNUNET_SCHEDULER_Task *timeout_task;

/**
 * Do we want to give our stdout to gnunet-service-arm?
 */
static int no_stdout;

/**
 * Do we want to give our stderr to gnunet-service-arm?
 */
static int no_stderr;

/**
 * Handle for the task running the #action_loop().
 */
static struct GNUNET_SCHEDULER_Task *al_task;

/**
 * Current operation.
 */
static struct GNUNET_ARM_Operation *op;

/**
 * Attempts to delete configuration file and GNUNET_HOME
 * on ARM shutdown provided the end and delete options
 * were specified when gnunet-arm was run.
 */
static void
delete_files ()
{
  GNUNET_log (
    GNUNET_ERROR_TYPE_DEBUG,
    "Will attempt to remove configuration file %s and service directory %s\n",
    config_file,
    dir);
  if (0 != UNLINK (config_file))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                _ ("Failed to remove configuration file %s\n"),
                config_file);
  }
  if (GNUNET_OK != GNUNET_DISK_directory_remove (dir))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                _ ("Failed to remove servicehome directory %s\n"),
                dir);
  }
}


/**
 * Main continuation-passing-style loop.  Runs the various
 * jobs that we've been asked to do in order.
 *
 * @param cls closure, unused
 */
static void
shutdown_task (void *cls)
{
  (void) cls;
  if (NULL != al_task)
  {
    GNUNET_SCHEDULER_cancel (al_task);
    al_task = NULL;
  }
  if (NULL != op)
  {
    GNUNET_ARM_operation_cancel (op);
    op = NULL;
  }
  if (NULL != h)
  {
    GNUNET_ARM_disconnect (h);
    h = NULL;
  }
  if (NULL != m)
  {
    GNUNET_ARM_monitor_stop (m);
    m = NULL;
  }
  if (NULL != timeout_task)
  {
    GNUNET_SCHEDULER_cancel (timeout_task);
    timeout_task = NULL;
  }
  if ((GNUNET_YES == end) && (GNUNET_YES == delete))
    delete_files ();
  GNUNET_CONFIGURATION_destroy (cfg);
  cfg = NULL;
}


/**
 * Returns a string interpretation of @a rs
 *
 * @param rs the request status from ARM
 * @return a string interpretation of the request status
 */
static const char *
req_string (enum GNUNET_ARM_RequestStatus rs)
{
  switch (rs)
  {
  case GNUNET_ARM_REQUEST_SENT_OK:
    return _ ("Message was sent successfully");
  case GNUNET_ARM_REQUEST_DISCONNECTED:
    return _ ("We disconnected from ARM before we could send a request");
  }
  return _ ("Unknown request status");
}


/**
 * Returns a string interpretation of the @a result
 *
 * @param result the arm result
 * @return a string interpretation
 */
static const char *
ret_string (enum GNUNET_ARM_Result result)
{
  switch (result)
  {
  case GNUNET_ARM_RESULT_STOPPED:
    return _ ("is stopped");
  case GNUNET_ARM_RESULT_STARTING:
    return _ ("is starting");
  case GNUNET_ARM_RESULT_STOPPING:
    return _ ("is stopping");
  case GNUNET_ARM_RESULT_IS_STARTING_ALREADY:
    return _ ("is starting already");
  case GNUNET_ARM_RESULT_IS_STOPPING_ALREADY:
    return _ ("is stopping already");
  case GNUNET_ARM_RESULT_IS_STARTED_ALREADY:
    return _ ("is started already");
  case GNUNET_ARM_RESULT_IS_STOPPED_ALREADY:
    return _ ("is stopped already");
  case GNUNET_ARM_RESULT_IS_NOT_KNOWN:
    return _ ("service is not known to ARM");
  case GNUNET_ARM_RESULT_START_FAILED:
    return _ ("service failed to start");
  case GNUNET_ARM_RESULT_IN_SHUTDOWN:
    return _ ("service cannot be manipulated because ARM is shutting down");
  }
  return _ ("Unknown result code.");
}


/**
 * Main task that runs our various operations in order.
 *
 * @param cls closure
 */
static void
action_loop (void *cls);


/**
 * Function called whenever we connect to or disconnect from ARM.
 * Termiantes the process if we fail to connect to the service on
 * our first attempt.
 *
 * @param cls closure
 * @param connected #GNUNET_YES if connected, #GNUNET_NO if disconnected,
 *                  #GNUNET_SYSERR on error.
 */
static void
conn_status (void *cls, int connected)
{
  static int once;

  (void) cls;
  if ((GNUNET_SYSERR == connected) && (0 == once))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _ ("Fatal error initializing ARM API.\n"));
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  once = 1;
}


/**
 * We have requested ARM to be started, this function
 * is called with the result of the operation.  Informs the
 * use of the result; on success, we continue with the event
 * loop, on failure we terminate the process.
 *
 * @param cls closure unused
 * @param rs what happened to our request
 * @param result if the request was processed, this is the result
 *               according to ARM
 */
static void
start_callback (void *cls,
                enum GNUNET_ARM_RequestStatus rs,
                enum GNUNET_ARM_Result result)
{
  (void) cls;
  op = NULL;
  if (GNUNET_ARM_REQUEST_SENT_OK != rs)
  {
    FPRINTF (stdout,
             _ ("Failed to start the ARM service: %s\n"),
             req_string (rs));
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  if ((GNUNET_ARM_RESULT_STARTING != result) &&
      (GNUNET_ARM_RESULT_IS_STARTED_ALREADY != result))
  {
    FPRINTF (stdout,
             _ ("Failed to start the ARM service: %s\n"),
             ret_string (result));
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "ARM service [re]start successful\n");
  start = 0;
  al_task = GNUNET_SCHEDULER_add_now (&action_loop, NULL);
}


/**
 * We have requested ARM to be stopped, this function
 * is called with the result of the operation.  Informs the
 * use of the result; on success, we continue with the event
 * loop, on failure we terminate the process.
 *
 * @param cls closure unused
 * @param rs what happened to our request
 * @param result if the request was processed, this is the result
 *               according to ARM
 */
static void
stop_callback (void *cls,
               enum GNUNET_ARM_RequestStatus rs,
               enum GNUNET_ARM_Result result)
{
  char *msg;

  (void) cls;
  op = NULL;
  if (GNUNET_ARM_REQUEST_SENT_OK != rs)
  {
    GNUNET_asprintf (&msg,
                     "%s",
                     _ (
                       "Failed to send a stop request to the ARM service: %s\n"));
    FPRINTF (stdout, msg, req_string (rs));
    GNUNET_free (msg);
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  if ((GNUNET_ARM_RESULT_STOPPING != result) &&
      (GNUNET_ARM_RESULT_STOPPED != result) &&
      (GNUNET_ARM_RESULT_IS_STOPPED_ALREADY != result))
  {
    FPRINTF (stdout,
             _ ("Failed to stop the ARM service: %s\n"),
             ret_string (result));
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "ARM service shutdown successful\n");
  end = 0;
  if (restart)
  {
    restart = 0;
    start = 1;
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Initiating an ARM restart\n");
  }
  al_task = GNUNET_SCHEDULER_add_now (&action_loop, NULL);
}


/**
 * We have requested a service to be started, this function
 * is called with the result of the operation.  Informs the
 * use of the result; on success, we continue with the event
 * loop, on failure we terminate the process.
 *
 * @param cls closure unused
 * @param rs what happened to our request
 * @param result if the request was processed, this is the result
 *               according to ARM
 */
static void
init_callback (void *cls,
               enum GNUNET_ARM_RequestStatus rs,
               enum GNUNET_ARM_Result result)
{
  (void) cls;
  op = NULL;
  if (GNUNET_ARM_REQUEST_SENT_OK != rs)
  {
    FPRINTF (stdout,
             _ ("Failed to send a request to start the `%s' service: %s\n"),
             init,
             req_string (rs));
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  if ((GNUNET_ARM_RESULT_STARTING != result) &&
      (GNUNET_ARM_RESULT_IS_STARTED_ALREADY != result))
  {
    FPRINTF (stdout,
             _ ("Failed to start the `%s' service: %s\n"),
             init,
             ret_string (result));
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Service %s [re]started successfully\n",
              init);
  GNUNET_free (init);
  init = NULL;
  al_task = GNUNET_SCHEDULER_add_now (&action_loop, NULL);
}


/**
 * We have requested a service to be stopped, this function
 * is called with the result of the operation.  Informs the
 * use of the result; on success, we continue with the event
 * loop, on failure we terminate the process.
 *
 * @param cls closure unused
 * @param rs what happened to our request
 * @param result if the request was processed, this is the result
 *               according to ARM
 */
static void
term_callback (void *cls,
               enum GNUNET_ARM_RequestStatus rs,
               enum GNUNET_ARM_Result result)
{
  char *msg;

  (void) cls;
  op = NULL;
  if (GNUNET_ARM_REQUEST_SENT_OK != rs)
  {
    GNUNET_asprintf (&msg,
                     _ (
                       "Failed to send a request to kill the `%s' service: %%s\n"),
                     term);
    FPRINTF (stdout, msg, req_string (rs));
    GNUNET_free (msg);
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  if ((GNUNET_ARM_RESULT_STOPPED != result) &&
      (GNUNET_ARM_RESULT_IS_STOPPED_ALREADY != result))
  {
    FPRINTF (stdout,
             _ ("Failed to kill the `%s' service: %s\n"),
             term,
             ret_string (result));
    GNUNET_SCHEDULER_shutdown ();
    return;
  }

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Service %s stopped successfully\n",
              term);
  GNUNET_free (term);
  term = NULL;
  al_task = GNUNET_SCHEDULER_add_now (&action_loop, NULL);
}


/**
 * Function called with the list of running services. Prints
 * the list to stdout, then starts the event loop again.
 * Prints an error message and terminates the process on errors.
 *
 * @param cls closure (unused)
 * @param rs request status (success, failure, etc.)
 * @param count number of services in the list
 * @param list list of services that are running
 */
static void
list_callback (void *cls,
               enum GNUNET_ARM_RequestStatus rs,
               unsigned int count,
               const char *const *list)
{
  (void) cls;
  op = NULL;
  if (GNUNET_ARM_REQUEST_SENT_OK != rs)
  {
    char *msg;

    GNUNET_asprintf (&msg,
                     "%s",
                     _ ("Failed to request a list of services: %s\n"));
    FPRINTF (stdout, msg, req_string (rs));
    GNUNET_free (msg);
    ret = 3;
    GNUNET_SCHEDULER_shutdown ();
  }
  if (NULL == list)
  {
    FPRINTF (stderr,
             "%s",
             _ ("Error communicating with ARM. ARM not running?\n"));
    GNUNET_SCHEDULER_shutdown ();
    ret = 3;
    return;
  }
  if (! quiet)
    FPRINTF (stdout, "%s", _ ("Running services:\n"));
  for (unsigned int i = 0; i < count; i++)
    FPRINTF (stdout, "%s\n", list[i]);
  al_task = GNUNET_SCHEDULER_add_now (&action_loop, NULL);
}


/**
 * Main action loop.  Runs the various jobs that we've been asked to
 * do, in order.
 *
 * @param cls closure, unused
 */
static void
action_loop (void *cls)
{
  (void) cls;
  al_task = NULL;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Running requested actions\n");
  while (1)
  {
    switch (phase++)
    {
    case 0:
      if (NULL != term)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Termination action\n");
        op = GNUNET_ARM_request_service_stop (h, term, &term_callback, NULL);
        return;
      }
      break;
    case 1:
      if (end || restart)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "End action\n");
        op = GNUNET_ARM_request_service_stop (h, "arm", &stop_callback, NULL);
        return;
      }
      break;
    case 2:
      if (start)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Start action\n");
        op =
          GNUNET_ARM_request_service_start (h,
                                            "arm",
                                            (no_stdout
                                               ? 0
                                               : GNUNET_OS_INHERIT_STD_OUT) |
                                              (no_stderr
                                                 ? 0
                                                 : GNUNET_OS_INHERIT_STD_ERR),
                                            &start_callback,
                                            NULL);
        return;
      }
      break;
    case 3:
      if (NULL != init)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Initialization action\n");
        op = GNUNET_ARM_request_service_start (h,
                                               init,
                                               GNUNET_OS_INHERIT_STD_NONE,
                                               &init_callback,
                                               NULL);
        return;
      }
      break;
    case 4:
      if (list)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                    "Going to list all running services controlled by ARM.\n");
        op = GNUNET_ARM_request_service_list (h, &list_callback, &list);
        return;
      }
      break;
    case 5:
      if (monitor)
      {
        if (! quiet)
          fprintf (stderr, _ ("Now only monitoring, press CTRL-C to stop.\n"));
        quiet =
          0; /* does not make sense to stay quiet in monitor mode at this time */
        return; /* done with tasks, just monitor */
      }
      break;
    default: /* last phase */
      GNUNET_SCHEDULER_shutdown ();
      return;
    }
  }
}


/**
 * Function called when a service starts or stops.
 *
 * @param cls closure
 * @param service service name
 * @param status status of the service
 */
static void
srv_status (void *cls,
            const char *service,
            enum GNUNET_ARM_ServiceStatus status)
{
  const char *msg;

  (void) cls;
  switch (status)
  {
  case GNUNET_ARM_SERVICE_MONITORING_STARTED:
    return; /* this should be done silently */
  case GNUNET_ARM_SERVICE_STOPPED:
    msg = _ ("Stopped %s.\n");
    break;
  case GNUNET_ARM_SERVICE_STARTING:
    msg = _ ("Starting %s...\n");
    break;
  case GNUNET_ARM_SERVICE_STOPPING:
    msg = _ ("Stopping %s...\n");
    break;
  default:
    msg = NULL;
    break;
  }
  if (! quiet)
  {
    if (NULL != msg)
      FPRINTF (stderr, msg, service);
    else
      FPRINTF (stderr,
               _ ("Unknown status %u for service %s.\n"),
               status,
               service);
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Got service %s status %d\n",
              service,
              (int) status);
}


/**
 * Task run on timeout (if -T is given).
 */
static void
timeout_task_cb (void *cls)
{
  (void) cls;
  timeout_task = NULL;
  ret = 2;
  GNUNET_SCHEDULER_shutdown ();
}


/**
 * 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 c configuration
 */
static void
run (void *cls,
     char *const *args,
     const char *cfgfile,
     const struct GNUNET_CONFIGURATION_Handle *c)
{
  (void) cls;
  (void) args;
  (void) cfgfile;
  cfg = GNUNET_CONFIGURATION_dup (c);
  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_string (cfg, "PATHS", "GNUNET_HOME", &dir))
  {
    GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, "PATHS", "GNUNET_HOME");
    return;
  }
  (void) GNUNET_CONFIGURATION_get_value_filename (cfg,
                                                  "arm",
                                                  "CONFIG",
                                                  &config_file);
  if (NULL == (h = GNUNET_ARM_connect (cfg, &conn_status, NULL)))
    return;
  if (monitor)
    m = GNUNET_ARM_monitor_start (cfg, &srv_status, NULL);
  al_task = GNUNET_SCHEDULER_add_now (&action_loop, NULL);
  GNUNET_SCHEDULER_add_shutdown (&shutdown_task, NULL);
  if (0 != timeout.rel_value_us)
    timeout_task =
      GNUNET_SCHEDULER_add_delayed (timeout, &timeout_task_cb, NULL);
}


/**
 * The main function to obtain arm from gnunetd.
 *
 * @param argc number of arguments from the command line
 * @param argv command line arguments
 * @return 0 ok, 1 on error, 2 on timeout
 */
int
main (int argc, char *const *argv)
{
  struct GNUNET_GETOPT_CommandLineOption options[] =
    {GNUNET_GETOPT_option_flag ('e',
                                "end",
                                gettext_noop ("stop all GNUnet services"),
                                &end),
     GNUNET_GETOPT_option_string ('i',
                                  "init",
                                  "SERVICE",
                                  gettext_noop ("start a particular service"),
                                  &init),
     GNUNET_GETOPT_option_string ('k',
                                  "kill",
                                  "SERVICE",
                                  gettext_noop ("stop a particular service"),
                                  &term),
     GNUNET_GETOPT_option_flag ('s',
                                "start",
                                gettext_noop (
                                  "start all GNUnet default services"),
                                &start),
     GNUNET_GETOPT_option_flag ('r',
                                "restart",
                                gettext_noop (
                                  "stop and start all GNUnet default services"),
                                &restart),
     GNUNET_GETOPT_option_flag ('d',
                                "delete",
                                gettext_noop (
                                  "delete config file and directory on exit"),
                                &delete),
     GNUNET_GETOPT_option_flag ('m',
                                "monitor",
                                gettext_noop ("monitor ARM activities"),
                                &monitor),
     GNUNET_GETOPT_option_flag ('q',
                                "quiet",
                                gettext_noop ("don't print status messages"),
                                &quiet),
     GNUNET_GETOPT_option_relative_time (
       'T',
       "timeout",
       "DELAY",
       gettext_noop (
         "exit with error status if operation does not finish after DELAY"),
       &timeout),
     GNUNET_GETOPT_option_flag ('I',
                                "info",
                                gettext_noop (
                                  "list currently running services"),
                                &list),
     GNUNET_GETOPT_option_flag (
       'O',
       "no-stdout",
       gettext_noop ("don't let gnunet-service-arm inherit standard output"),
       &no_stdout),
     GNUNET_GETOPT_option_flag (
       'E',
       "no-stderr",
       gettext_noop ("don't let gnunet-service-arm inherit standard error"),
       &no_stderr),
     GNUNET_GETOPT_OPTION_END};

  if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
    return 2;
  if (GNUNET_OK ==
      GNUNET_PROGRAM_run (
        argc,
        argv,
        "gnunet-arm",
        gettext_noop (
          "Control services and the Automated Restart Manager (ARM)"),
        options,
        &run,
        NULL))
  {
    GNUNET_free ((void *) argv);
    return ret;
  }
  GNUNET_free ((void *) argv);
  return 1;
}

/* end of gnunet-arm.c */