/****************************************************************************
 * apps/wireless/ieee802154/i8sak/i8sak_acceptassoc.c
 * IEEE 802.15.4 Swiss Army Knife
 *
 *   Copyright (C) 2017 Verge Inc. All rights reserved.
 *   Author: Anthony Merlino <anthony@vergeaero.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <nuttx/fs/ioctl.h>

#include "i8sak.h"

#include <nuttx/wireless/ieee802154/ieee802154_ioctl.h>
#include <nuttx/wireless/ieee802154/ieee802154_mac.h>
#include "wireless/ieee802154.h"

/****************************************************************************
 * Private Function Prototypes
 ****************************************************************************/

static void acceptassoc_eventcb(FAR struct ieee802154_notif_s *notif, FAR void *arg);

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name : i8_acceptassoc
 *
 * Description :
 *   Start accepting association requests.
 ****************************************************************************/

void i8sak_acceptassoc_cmd(FAR struct i8sak_s *i8sak, int argc, FAR char *argv[])
{
  struct wpanlistener_eventfilter_s filter;
  bool acceptall = true; /* start off assuming we are going to allow all connections */
  int option, optcnt;

  optcnt = 0;
  while ((option = getopt(argc, argv, ":he:")) != ERROR)
    {
      optcnt++;
      switch (option)
        {
          case 'h':
            fprintf(stderr, "Starts accepting association requests\n"
                    "Usage: %s [-h|e <extended address>]\n"
                    "    -h = this help menu\n"
                    "    -e = only accept requests from eaddr\n"
                    "Note: No option accepts all requests\n"
                    , argv[0]);
            /* Must manually reset optind if we are going to exit early */

            optind = -1;
            return;
          case 'e': /* Accept only this extended address */
            i8sak_str2eaddr(optarg, &i8sak->ep.eaddr[0]);
            acceptall = false;
            break;
          case ':':
            fprintf(stderr, "ERROR: missing argument\n");

            /* Must manually reset optind if we are going to exit early */

            optind = -1;
            i8sak_cmd_error(i8sak); /* This exits for us */
          case '?':
            fprintf(stderr, "ERROR: invalid argument\n");

            /* Must manually reset optind if we are going to exit early */

            optind = -1;
            i8sak_cmd_error(i8sak); /* This exits for us */
        }
    }

  if (!optcnt)
    {
      i8sak->acceptall = acceptall;
      printf("i8sak: accepting all assoc requests\n");
    }

  /* Register new callback for receiving the association notifications */

  memset(&filter, 0, sizeof(struct wpanlistener_eventfilter_s));
  filter.indevents.assoc = true;

  wpanlistener_add_eventreceiver(&i8sak->wpanlistener, acceptassoc_eventcb,
                                 &filter, (FAR void *)i8sak, !i8sak->acceptall);
}

static void acceptassoc_eventcb(FAR struct ieee802154_notif_s *notif, FAR void *arg)
{
  FAR struct i8sak_s *i8sak = (FAR struct i8sak_s *)arg;
  struct ieee802154_assoc_resp_s assocresp;

  printf("i8sak: a device is trying to associate\n");

  /* If the address matches our device, accept the association. 
   * Otherwise, reject the assocation.
   */

  if (memcmp(&notif->u.assocind.devaddr[0], &i8sak->ep.eaddr[0],
              IEEE802154_EADDR_LEN) == 0)
    {
      /* Send a ASSOC.resp primtive to the MAC. Copy the association
        * indication address into the association response primitive
        */  

      memcpy(&assocresp.devaddr[0], &notif->u.assocind.devaddr[0],
              IEEE802154_EADDR_LEN);
            
      assocresp.assocsaddr = i8sak->next_saddr;

      assocresp.status = IEEE802154_STATUS_SUCCESS;

      printf("i8sak: accepting association request\n");
    }
  else
    {
      /* Send a ASSOC.resp primtive to the MAC. Copy the association
        * indication address into the association response primitive
        */ 

      memcpy(&assocresp.devaddr[0], &notif->u.assocind.devaddr[0],
              IEEE802154_EADDR_LEN);
            
      assocresp.status = IEEE802154_STATUS_DENIED;

      printf("i8sak: rejecting association request\n");
    }

  ieee802154_assoc_resp(i8sak->fd, &assocresp);
}