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/* @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC */

/*

 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for

 * unrestricted use provided that this legend is included on all tape

 * media and as a part of the software program in whole or part.  Users

 * may copy or modify Sun RPC without charge, but are not authorized

 * to license or distribute it to anyone else except as part of a product or

 * program developed by the user.

 *

 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE

 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.

 *

 * Sun RPC is provided with no support and without any obligation on the

 * part of Sun Microsystems, Inc. to assist in its use, correction,

 * modification or enhancement.

 *

 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE

 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC

 * OR ANY PART THEREOF.

 *

 * In no event will Sun Microsystems, Inc. be liable for any lost revenue

 * or profits or other special, indirect and consequential damages, even if

 * Sun has been advised of the possibility of such damages.

 *

 * Sun Microsystems, Inc.

 * 2550 Garcia Avenue

 * Mountain View, California  94043

 */

#if 0

static char sccsid[] = "@(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";

#endif

/*

 * get_myaddress.c

 *

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

 * Copyright (C) 1984, Sun Microsystems, Inc.

 */

#include <rpc/types.h>

#include <rpc/clnt.h>

#include <rpc/pmap_prot.h>

#include <sys/socket.h>

#include <stdio.h>

#include <unistd.h>

#include <net/if.h>

#include <sys/ioctl.h>

/* Order of following two #includes reversed by roland@gnu */

#include <netinet/in.h>

#include <arpa/inet.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)

{

  int s;

  char buf[BUFSIZ];

  struct ifconf ifc;

  struct ifreq ifreq, *ifr;

  int len, loopback = 0;

  if ((s = socket (AF_INET, SOCK_DGRAM, 0)) < 0)

    {

      perror ("get_myaddress: socket");

      exit (1);

    }

  ifc.ifc_len = sizeof (buf);

  ifc.ifc_buf = buf;

  if (ioctl (s, SIOCGIFCONF, (char *) &ifc) < 0)

    {

      perror (_("get_myaddress: ioctl (get interface configuration)"));

      exit (1);

    }

 again:

  ifr = ifc.ifc_req;

  for (len = ifc.ifc_len; len; len -= sizeof ifreq)

    {

      ifreq = *ifr;

      if (ioctl (s, SIOCGIFFLAGS, (char *) &ifreq) < 0)

        {

          perror ("get_myaddress: ioctl");

          exit (1);

        }

      if ((ifreq.ifr_flags & IFF_UP) && (ifr->ifr_addr.sa_family == AF_INET)

          && (!(ifreq.ifr_flags & IFF_LOOPBACK) ||

              (loopback == 1 && (ifreq.ifr_flags & IFF_LOOPBACK))))

        {

          *addr = *((struct sockaddr_in *) &ifr->ifr_addr);

          addr->sin_port = htons (PMAPPORT);

          close (s);

          return;

        }

      ifr++;

    }

  if (loopback == 0)

    {

      loopback = 1;

      goto again;

    }

  close (s);

}