/****************************************************************************
 * netutils/netlib/netlib_autoconfig.c
 *
 *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * 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>
#if defined(CONFIG_NET_ICMPv6_AUTOCONF) && CONFIG_NSOCKET_DESCRIPTORS > 0

#include <sys/socket.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

#include <netinet/in.h>
#include <net/if.h>

#include "netutils/netlib.h"

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

/****************************************************************************
 * Name: netlib_icmpv6_autoconfiguration
 *
 * Description:
 *   Perform ICMPv6 auto-configuration in an attempt to get the IP address
 *   of the specified network device.
 *
 * Parameters:
 *   ifname   The name of the interface to use
 *
 * Return:
 *   0 on success; -1 on failure (with the errno variable set appropriately)
 *
 ****************************************************************************/

int netlib_icmpv6_autoconfiguration(FAR const char *ifname)
{
  int ret = ERROR;

  /* Verify that an interface name was provided */

  if (ifname)
    {
      /* Get an IPv6 socket */

      int sockfd = socket(PF_INET6, NETLIB_SOCK_IOCTL, 0);
      if (sockfd >= 0)
        {
          /* Create a request consisting only of the interface name */

          struct lifreq req;
          strncpy(req.lifr_name, ifname, IFNAMSIZ);

          /* Perform the ICMPv6 auto-configuration and close the socket */

          ret = ioctl(sockfd, SIOCIFAUTOCONF,
                      (unsigned long)((uintptr_t)&req));
          close(sockfd);
        }
    }
  else
    {
      /* No interface name */

      set_errno(EINVAL);
    }

  return ret;
}

#endif /* CONFIG_NET_ICMPv6_AUTOCONF && CONFIG_NSOCKET_DESCRIPTORS */
