/* $NetBSD: ifaddrlist.c,v 1.12 2021/10/30 09:26:11 nia Exp $ */
/*
* Copyright (c) 1997, 1998, 1999, 2000
* The Regents of the University of California. 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 Computer Systems
* Engineering Group at Lawrence Berkeley Laboratory.
* 4. Neither the name of the University nor of the Laboratory may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 <sys/cdefs.h>
#ifndef lint
#if 0
static const char rcsid[] =
"@(#) Header: ifaddrlist.c,v 1.2 97/04/22 13:31:05 leres Exp (LBL)";
"@(#) Id: ifaddrlist.c,v 1.9 2000/11/23 20:01:55 leres Exp (LBL)";
#else
__RCSID("$NetBSD: ifaddrlist.c,v 1.12 2021/10/30 09:26:11 nia Exp $");
#endif
#endif
#include <sys/param.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif
#include <sys/time.h> /* concession to AIX */
struct mbuf;
struct rtentry;
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ifaddrs.h>
#include "gnuc.h"
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
#include "ifaddrlist.h"
#include "prog_ops.h"
/* Not all systems have IFF_LOOPBACK */
#ifdef IFF_LOOPBACK
#define ISLOOPBACK(p) ((p)->ifa_flags & IFF_LOOPBACK)
#else
#define ISLOOPBACK(p) (strcmp((p)->ifa_name, "lo0") == 0)
#endif
/*
* Return the interface list
*/
ssize_t
ifaddrlist(struct ifaddrlist **ipaddrp, char *errbuf, size_t buflen)
{
struct sockaddr_in *sin;
struct ifaddrs *ifap = NULL, *ifa;
struct ifaddrlist *al = NULL;
size_t i = 0, maxal = 10;
if (prog_getifaddrs(&ifap) != 0)
goto out;
if (reallocarr(&al, maxal, sizeof(*al)) != 0)
goto out;
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
/* Must be up */
if ((ifa->ifa_flags & IFF_UP) == 0)
continue;
/*
* Must not be a loopback address (127/8)
*/
sin = (struct sockaddr_in *)ifa->ifa_addr;
if (ISLOOPBACK(ifa))
if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK)
continue;
if (i == maxal) {
maxal <<= 1;
if (reallocarr(&al, maxal, sizeof(*al)) != 0)
goto out;
}
al[i].addr = sin->sin_addr.s_addr;
if ((al[i].device = strdup(ifa->ifa_name)) == NULL)
goto out;
i++;
}
if (reallocarr(&al, i, sizeof(*al)) != 0)
goto out;
freeifaddrs(ifap);
*ipaddrp = al;
return (ssize_t)i;
out:
if (ifap)
freeifaddrs(ifap);
if (al) {
while (i > 0)
free(al[--i].device);
free(al);
}
(void)snprintf(errbuf, buflen, "%s: %s", __func__, strerror(errno));
return -1;
}
