/*

 * get_myaddress.c

 *

 * Get client's IP address via ioctl.  This avoids using the yellowpages.

 * Copyright (c) 2010, Oracle America, Inc.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are

 * met:

 *

 *     * Redistributions of source code must retain the above copyright

 *       notice, this list of conditions and the following disclaimer.

 *     * 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.

 *     * Neither the name of the "Oracle America, Inc." 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 HOLDER 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.

 */

#include <rpc/types.h>

#include <rpc/clnt.h>

#include <rpc/pmap_prot.h>

#include <sys/socket.h>

#include <stdio.h>

#include <unistd.h>

#include <libintl.h>

#include <net/if.h>

#include <ifaddrs.h>

#include <sys/ioctl.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <shlib-compat.h>

/*

 * don't use gethostbyname, which would invoke yellow pages

 *

 * Avoid loopback interfaces.  We return information from a loopback

 * interface only if there are no other possible interfaces.

 */

void

get_myaddress (struct sockaddr_in *addr)

{

  struct ifaddrs *ifa;

  if (getifaddrs (&ifa) != 0)

    {

      perror ("get_myaddress: getifaddrs");

      exit (1);

    }

  int loopback = 0;

  struct ifaddrs *run;

 again:

  run = ifa;

  while (run != NULL)

    {

      if ((run->ifa_flags & IFF_UP)

	  && run->ifa_addr != NULL

	  && run->ifa_addr->sa_family == AF_INET

	  && (!(run->ifa_flags & IFF_LOOPBACK)

	      || (loopback == 1 && (run->ifa_flags & IFF_LOOPBACK))))

	{

	  *addr = *((struct sockaddr_in *) run->ifa_addr);

	  addr->sin_port = htons (PMAPPORT);

	  goto out;

	}

      run = run->ifa_next;

    }

  if (loopback == 0)

    {

      loopback = 1;

      goto again;

    }

 out:

  freeifaddrs (ifa);

  /* The function is horribly specified.  It does not return any error

     if no interface is up.  Probably this won't happen (at least

     loopback is there) but still...  */

}

#ifdef EXPORT_RPC_SYMBOLS

libc_hidden_def (get_myaddress)

#else

libc_hidden_nolink_sunrpc (get_myaddress, GLIBC_2_0)

#endif