ifaddrlist.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* Copyright 1997,2002-2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 1997
* 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.
*
* @(#) $Header: ifaddrlist.c,v 1.2 97/04/22 13:31:05 leres Exp $ (LBL)
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/param.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/time.h>
#include <net/if.h>
#include <netinet/in.h>
#include <ctype.h>
#include <errno.h>
#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libintl.h>
#include "ifaddrlist.h"
/*
* Construct the interface list with given address family.
* If it fails, returns -1 and an error message in *errbuf;
* otherwise, returns number of interfaces, and the interface list in *ipaddrp.
*/
int
ifaddrlist(struct ifaddrlist **ipaddrp, int family, char *errbuf)
{
int fd;
struct lifreq *lifrp, *lifend;
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
struct ifaddrlist *al;
struct lifconf lifc;
struct lifreq *ibuf, lifr;
char device[LIFNAMSIZ + 1];
struct ifaddrlist *ifaddrlist;
struct lifnum lifn;
int lifc_flags = 0;
int count;
if (family != AF_INET && family != AF_INET6) {
(void) sprintf(errbuf, "invalid address family");
return (-1);
}
fd = socket(family, SOCK_DGRAM, 0);
if (fd < 0) {
(void) snprintf(errbuf, ERRBUFSIZE, "socket: %s",
strerror(errno));
return (-1);
}
/* determine the number of interfaces */
lifn.lifn_family = family;
lifn.lifn_flags = lifc_flags;
if (ioctl(fd, SIOCGLIFNUM, &lifn) < 0) {
(void) snprintf(errbuf, ERRBUFSIZE, "SIOCGLIFNUM: %s",
strerror(errno));
(void) close(fd);
return (-1);
}
/* allocate memory for the determined number of interfaces */
ifaddrlist = calloc((size_t)lifn.lifn_count,
(size_t)sizeof (struct ifaddrlist));
if (ifaddrlist == NULL) {
(void) snprintf(errbuf, ERRBUFSIZE, "calloc: %s",
strerror(errno));
(void) close(fd);
return (-1);
}
ibuf = calloc((size_t)lifn.lifn_count, (size_t)sizeof (struct lifreq));
if (ibuf == NULL) {
(void) snprintf(errbuf, ERRBUFSIZE, "calloc: %s",
strerror(errno));
free(ifaddrlist);
(void) close(fd);
return (-1);
}
/* pull out the interface list from the kernel */
lifc.lifc_family = family;
lifc.lifc_len = (int)(lifn.lifn_count * sizeof (struct lifreq));
lifc.lifc_buf = (caddr_t)ibuf;
lifc.lifc_flags = lifc_flags;
if (ioctl(fd, SIOCGLIFCONF, (char *)&lifc) < 0 ||
lifc.lifc_len < sizeof (struct lifreq)) {
(void) snprintf(errbuf, ERRBUFSIZE, "SIOCGLIFCONF: %s",
strerror(errno));
free(ifaddrlist);
free(ibuf);
(void) close(fd);
return (-1);
}
lifrp = ibuf;
/* LINTED */
lifend = (struct lifreq *)((char *)ibuf + lifc.lifc_len);
al = ifaddrlist;
count = 0;
/* let's populate the interface entries in the ifaddrlist */
for (; lifrp < lifend; lifrp++) {
/*
* Need a template to preserve address info that is
* used below to locate the next entry. (Otherwise,
* SIOCGLIFFLAGS stomps over it because the requests
* are returned in a union.)
*/
(void) strlcpy(lifr.lifr_name, lifrp->lifr_name,
sizeof (lifr.lifr_name));
if (ioctl(fd, SIOCGLIFFLAGS, (char *)&lifr) < 0) {
if (errno == ENXIO) {
continue;
}
(void) snprintf(errbuf, ERRBUFSIZE,
"SIOCGLIFFLAGS: %.*s: %s",
(int)sizeof (lifr.lifr_name), lifr.lifr_name,
strerror(errno));
free(ifaddrlist);
free(ibuf);
(void) close(fd);
return (-1);
}
al->flags = lifr.lifr_flags;
/* get the interface address */
(void) strncpy(device, lifr.lifr_name, sizeof (device));
device[sizeof (device) - 1] = '\0';
if (ioctl(fd, SIOCGLIFADDR, (char *)&lifr) < 0) {
(void) snprintf(errbuf, ERRBUFSIZE,
"SIOCGLIFADDR: %s: %s", device, strerror(errno));
free(ifaddrlist);
free(ibuf);
(void) close(fd);
return (-1);
}
if (family == AF_INET) {
sin = (struct sockaddr_in *)&lifr.lifr_addr;
al->addr.addr = sin->sin_addr;
} else {
sin6 = (struct sockaddr_in6 *)&lifr.lifr_addr;
al->addr.addr6 = sin6->sin6_addr;
}
(void) strlcpy(al->device, device, sizeof (device));
/* get the interface index */
if (ioctl(fd, SIOCGLIFINDEX, (char *)&lifr) < 0) {
(void) snprintf(errbuf, ERRBUFSIZE,
"SIOCGLIFADDR: %s: %s", device, strerror(errno));
free(ifaddrlist);
free(ibuf);
(void) close(fd);
return (-1);
}
al->index = lifr.lifr_index;
++al;
++count;
}
free(ibuf);
(void) close(fd);
*ipaddrp = ifaddrlist;
return (count);
}