/*
 * Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 * 
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the Kungliga Tekniska
 *      Högskolan and its contributors.
 * 
 * 4. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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 "krb_locl.h"

RCSID("$Id: getaddrs.c,v 1.26.2.1 1999/07/22 03:15:33 assar Exp $");

#if defined(HAVE_SYS_IOCTL_H) && SunOS != 40
#include <sys/ioctl.h>
#endif
#ifdef HAVE_NET_IF_H
#ifdef __osf__
struct rtentry;
struct mbuf;
#endif
#ifdef _AIX
#undef __P /* XXX hack for AIX 4.3 */
#endif
#include <net/if.h>
#endif

#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif /* HAVE_SYS_SOCKIO_H */

/*
 * Return number and list of all local adresses.
 */

int
k_get_all_addrs (struct in_addr **l)
{
#if !defined(SIOCGIFCONF) || !defined(SIOCGIFFLAGS) || !defined(SIOCGIFADDR)
     char name[MaxHostNameLen];
     struct hostent *he;

     if (gethostname(name, sizeof(name)) < 0)
	  return -1;
     he = gethostbyname (name);
     if (he == NULL)
	  return -1;
     *l = malloc(sizeof(**l));
     if (*l == NULL)
	  return -1;
     memcpy (*l, he->h_addr_list[0], sizeof(*l));
     return 1;
#else
     int fd;
     char *inbuf = NULL;
     size_t in_len = 8192;
     struct ifreq ifreq;
     struct ifconf ifconf;
     int num, j;
     char *p;
     size_t sz;

     *l = NULL;
     fd = socket(AF_INET, SOCK_DGRAM, 0);
     if (fd < 0)
	  return -1;

     for(;;) {
	 void *tmp;

	 tmp = realloc (inbuf, in_len);
	 if (tmp == NULL)
	     goto fail;
	 inbuf = tmp;

	 ifconf.ifc_len = in_len;
	 ifconf.ifc_buf = inbuf;

	 if(ioctl(fd, SIOCGIFCONF, &ifconf) < 0)
	     goto fail;
	 if(ifconf.ifc_len + sizeof(ifreq) < in_len)
	     break;
	 in_len *= 2;
     }
     num = ifconf.ifc_len / sizeof(struct ifreq);
     *l = malloc(num * sizeof(struct in_addr));
     if(*l == NULL)
	 goto fail;

     j = 0;
     ifreq.ifr_name[0] = '\0';
     for (p = ifconf.ifc_buf; p < ifconf.ifc_buf + ifconf.ifc_len; p += sz) {
          struct ifreq *ifr = (struct ifreq *)p;
	  sz = sizeof(*ifr);
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
	  sz = max(sz, sizeof(ifr->ifr_name) + ifr->ifr_addr.sa_len);
#endif

	  if(strncmp(ifreq.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name))) {
	      if(ioctl(fd, SIOCGIFFLAGS, ifr) < 0)
		  continue;
	      if (ifr->ifr_flags & IFF_UP) {
		  if(ioctl(fd, SIOCGIFADDR, ifr) < 0) 
		      continue;
		  (*l)[j++] = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
	       }
	      ifreq = *ifr;
	  }
     }
     if (j != num) {
	 void *tmp;
	 tmp = realloc (*l, j * sizeof(struct in_addr));
	 if(tmp == NULL)
	     goto fail;
	 *l = tmp;
     }
     close (fd);
     free(inbuf);
     return j;
fail:
     close(fd);
     free(inbuf);
     free(*l);
     return -1;
#endif /* SIOCGIFCONF */
}