NetBSD/usr.sbin/traceroute/ifaddrlist.c

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/* $NetBSD: ifaddrlist.c,v 1.2 1998/07/04 20:47:24 mrg Exp $ */
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/*
* 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.
*/
#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)";
#else
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__RCSID("$NetBSD: ifaddrlist.c,v 1.2 1998/07/04 20:47:24 mrg Exp $");
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#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 */
#if __STDC__
struct mbuf;
struct rtentry;
#endif
#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 "gnuc.h"
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
#include "ifaddrlist.h"
#include "savestr.h"
/* Not all systems have IFF_LOOPBACK */
#ifdef IFF_LOOPBACK
#define ISLOOPBACK(p) ((p)->ifr_flags & IFF_LOOPBACK)
#else
#define ISLOOPBACK(p) (strcmp((p)->ifr_name, "lo0") == 0)
#endif
#define MAX_IPADDR 32
/*
* Return the interface list
*/
int
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ifaddrlist(struct ifaddrlist **ipaddrp, char *errbuf, int buflen)
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{
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int fd, nipaddr;
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#ifdef HAVE_SOCKADDR_SA_LEN
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int n;
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#endif
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struct ifreq *ifrp, *ifend, *ifnext, *mp;
struct sockaddr_in *sin;
struct ifaddrlist *al;
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struct ifconf ifc;
struct ifreq ibuf[MAX_IPADDR], ifr;
char device[sizeof(ifr.ifr_name) + 1];
static struct ifaddrlist ifaddrlist[MAX_IPADDR];
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
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(void)snprintf(errbuf, buflen, "socket: %s", strerror(errno));
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return (-1);
}
ifc.ifc_len = sizeof(ibuf);
ifc.ifc_buf = (caddr_t)ibuf;
if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 ||
ifc.ifc_len < sizeof(struct ifreq)) {
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(void)snprintf(errbuf, buflen, "SIOCGIFCONF: %s", strerror(errno));
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(void)close(fd);
return (-1);
}
ifrp = ibuf;
ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
al = ifaddrlist;
mp = NULL;
nipaddr = 0;
for (; ifrp < ifend; ifrp = ifnext) {
#ifdef HAVE_SOCKADDR_SA_LEN
n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
if (n < sizeof(*ifrp))
ifnext = ifrp + 1;
else
ifnext = (struct ifreq *)((char *)ifrp + n);
if (ifrp->ifr_addr.sa_family != AF_INET)
continue;
#else
ifnext = ifrp + 1;
#endif
/*
* Need a template to preserve address info that is
* used below to locate the next entry. (Otherwise,
* SIOCGIFFLAGS stomps over it because the requests
* are returned in a union.)
*/
strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
if (errno == ENXIO)
continue;
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(void)snprintf(errbuf, buflen, "SIOCGIFFLAGS: %.*s: %s",
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(int)sizeof(ifr.ifr_name), ifr.ifr_name,
strerror(errno));
(void)close(fd);
return (-1);
}
/* Must be up and not the loopback */
if ((ifr.ifr_flags & IFF_UP) == 0 || ISLOOPBACK(&ifr))
continue;
(void)strncpy(device, ifr.ifr_name, sizeof(ifr.ifr_name));
device[sizeof(device) - 1] = '\0';
if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
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(void)snprintf(errbuf, buflen, "SIOCGIFADDR: %s: %s",
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device, strerror(errno));
(void)close(fd);
return (-1);
}
sin = (struct sockaddr_in *)&ifr.ifr_addr;
al->addr = sin->sin_addr.s_addr;
al->device = savestr(device);
++al;
++nipaddr;
}
(void)close(fd);
*ipaddrp = ifaddrlist;
return (nipaddr);
}