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/* $KTH: getaddrs.c,v 1.20 1997/11/09 06:13:32 assar Exp $ */
/*
* Copyright (c) 1995, 1996, 1997 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"
#include <sys/ioctl.h>
#include <net/if.h>
#include <sys/sockio.h>
#ifndef MAX
#define MAX(a,b) (((a)>(b))?(a):(b))
#endif /* MAX */
#ifndef MIN
#define MIN(a,b) (((a)<(b))?(a):(b))
#endif /* MIN */
/*
* Return number and list of all local adresses.
*/
int
k_get_all_addrs (struct in_addr **l)
{
int fd;
char buf[BUFSIZ];
struct ifreq ifreq;
struct ifconf ifconf;
int num, j;
char *p;
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0)
return -1;
ifconf.ifc_len = sizeof(buf);
ifconf.ifc_buf = buf;
if(ioctl(fd, SIOCGIFCONF, &ifconf) < 0)
return -1;
num = ifconf.ifc_len / sizeof(struct ifreq);
*l = malloc(num * sizeof(struct in_addr));
if(*l == NULL) {
close (fd);
return -1;
}
j = 0;
ifreq.ifr_name[0] = '\0';
for (p = ifconf.ifc_buf; p < ifconf.ifc_buf + ifconf.ifc_len;) {
struct ifreq *ifr = (struct ifreq *)p;
size_t sz = sizeof(*ifr);
sz = MAX(sz, sizeof(ifr->ifr_name) + ifr->ifr_addr.sa_len);
if(strncmp(ifreq.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name))) {
if(ioctl(fd, SIOCGIFFLAGS, ifr) < 0) {
close (fd);
free (*l);
return -1;
}
if (ifr->ifr_flags & IFF_UP) {
if(ioctl(fd, SIOCGIFADDR, ifr) < 0) {
close (fd);
free (*l);
return -1;
}
(*l)[j++] = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
}
ifreq = *ifr;
}
p = p + sz;
}
if (j != num)
*l = realloc (*l, j * sizeof(struct in_addr));
close (fd);
return j;
}
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