text: /****************************************************************************
   * netutils/netlib/netlib_setifstatus.c
   *
   *   Copyright (C) 2007-2009, 2011, 2014 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>
  
  #include <sys/socket.h>
  #include <sys/ioctl.h>
  #include <stdint.h>
  #include <string.h>
  #include <unistd.h>
  #include <errno.h>
  
  #include <netinet/in.h>
  #include <net/if.h>
  
  #include "netutils/netlib.h"
  
  #if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  /* The address family that we used to create the socket really does not
   * matter.  It should, however, be valid in the current configuration.
   */
  
  #if defined(CONFIG_NET_IPv4)
  #  define AF_FAMILY  AF_INET
  #elif defined(CONFIG_NET_IPv6)
  #  define AF_FAMILY  AF_INET6
  #elif defined(CONFIG_NET_LOCAL)
  #  define AF_FAMILY  AF_LOCAL
  #elif defined(CONFIG_NET_PKT)
  #  define AF_FAMILY  AF_PACKET
  #elif defined(CONFIG_NET_IEEE802154)
  #  define AF_FAMILY AF_IEEE802154
  #elif defined(CONFIG_NET_USRSOCK)
  #  define AF_FAMILY  AF_INET
  #endif
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: netlib_ifup
   *
   * Description:
   *   Set the network interface UP
   *
   * Parameters:
   *   ifname   The name of the interface to use
   *
   * Return:
   *   0 on success; -1 on failure
   *
   ****************************************************************************/
  
  int netlib_ifup(const char *ifname)
  {
    int ret = ERROR;
    if (ifname)
      {
        /* Get a socket (only so that we get access to the INET subsystem) */
  
        int sockfd = socket(AF_FAMILY, NETLIB_SOCK_TYPE, 0);
        if (sockfd >= 0)
          {
            struct ifreq req;
            memset (&req, 0, sizeof(struct ifreq));
  
            /* Put the driver name into the request */
  
            strncpy(req.ifr_name, ifname, IFNAMSIZ);
  
            /* Perform the ioctl to ifup flag */
  
            req.ifr_flags |= IFF_UP;
  
            ret = ioctl(sockfd, SIOCSIFFLAGS, (unsigned long)&req);
            close(sockfd);
          }
      }
  
    return ret;
  }
  
  /****************************************************************************
   * Name: netlib_ifdown
   *
   * Description:
   *   Set the network interface DOWN
   *
   * Parameters:
   *   ifname   The name of the interface to use
   *
   * Return:
   *   0 on success; -1 on failure
   *
   ****************************************************************************/
  
  int netlib_ifdown(const char *ifname)
  {
    int ret = ERROR;
    if (ifname)
      {
        /* Get a socket (only so that we get access to the INET subsystem) */
  
        int sockfd = socket(AF_FAMILY, NETLIB_SOCK_TYPE, 0);
        if (sockfd >= 0)
          {
            struct ifreq req;
            memset (&req, 0, sizeof(struct ifreq));
  
            /* Put the driver name into the request */
  
            strncpy(req.ifr_name, ifname, IFNAMSIZ);
  
            /* Perform the ioctl to ifup flag */
  
            req.ifr_flags |= IFF_DOWN;
  
            ret = ioctl(sockfd, SIOCSIFFLAGS, (unsigned long)&req);
            close(sockfd);
          }
      }
  
    return ret;
  }
  
  #endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS */
  