1/*
2 * Copyright (c) 1997, 1998, 1999, 2000
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the Computer Systems
16 *	Engineering Group at Lawrence Berkeley Laboratory.
17 * 4. Neither the name of the University nor of the Laboratory may be used
18 *    to endorse or promote products derived from this software without
19 *    specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char rcsid[] =
36    "@(#) $Id: ifaddrlist.c,v 1.9 2000/11/23 20:01:55 leres Exp $ (LBL)";
37#endif
38
39#include <sys/param.h>
40#include <sys/ioctl.h>
41#include <sys/socket.h>
42#ifdef HAVE_SYS_SOCKIO_H
43#include <sys/sockio.h>
44#endif
45#include <sys/time.h>				/* concession to AIX */
46
47#include <sys/sockio.h> /* for SIOCGIFCONF */
48
49#if __STDC__
50struct mbuf;
51struct rtentry;
52#endif
53
54#include <net/if.h>
55#include <netinet/in.h>
56
57#include <ctype.h>
58#include <errno.h>
59#include <memory.h>
60#include <stdio.h>
61#include <stdlib.h>
62#include <string.h>
63#include <unistd.h>
64
65#include "gnuc.h"
66#ifdef HAVE_OS_PROTO_H
67#include "os-proto.h"
68#endif
69
70#include "ifaddrlist.h"
71
72/*
73 * Return the interface list
74 */
75int
76ifaddrlist(register struct ifaddrlist **ipaddrp, register char *errbuf)
77{
78	register int fd, nipaddr;
79#ifdef HAVE_SOCKADDR_SA_LEN
80	register int n;
81#endif
82	register struct ifreq *ifrp, *ifend, *ifnext, *mp;
83	register struct sockaddr_in *sin;
84	register struct ifaddrlist *al;
85	struct ifconf ifc;
86	struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr;
87#define MAX_IPADDR (sizeof(ibuf) / sizeof(ibuf[0]))
88	static struct ifaddrlist ifaddrlist[MAX_IPADDR];
89	char device[sizeof(ifr.ifr_name) + 1];
90
91	fd = socket(AF_INET, SOCK_DGRAM, 0);
92	if (fd < 0) {
93		(void)sprintf(errbuf, "socket: %s", strerror(errno));
94		return (-1);
95	}
96	ifc.ifc_len = sizeof(ibuf);
97	ifc.ifc_buf = (caddr_t)ibuf;
98
99	if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0) {
100		if (errno == EINVAL)
101			(void)sprintf(errbuf,
102			    "SIOCGIFCONF: ifreq struct too small (%d bytes)",
103			    sizeof(ibuf));
104		else
105			(void)sprintf(errbuf, "SIOCGIFCONF: %s",
106			    strerror(errno));
107		(void)close(fd);
108		return (-1);
109	}
110	ifrp = ibuf;
111	ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
112
113	al = ifaddrlist;
114	mp = NULL;
115	nipaddr = 0;
116	for (; ifrp < ifend; ifrp = ifnext) {
117#ifdef HAVE_SOCKADDR_SA_LEN
118		n = _SIZEOF_ADDR_IFREQ(*ifrp);
119		/*
120		 * our ifreqs from SIOCGIFCONF dumps are very packed
121		*/
122		ifnext = (struct ifreq *)((char *)ifrp + n);
123		if (ifrp->ifr_addr.sa_family != AF_INET)
124			continue;
125#else
126		ifnext = ifrp + 1;
127#endif
128		/*
129		 * Need a template to preserve address info that is
130		 * used below to locate the next entry.  (Otherwise,
131		 * SIOCGIFFLAGS stomps over it because the requests
132		 * are returned in a union.)
133		 */
134		strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
135		if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr, sizeof(ifr)) < 0) {
136			if (errno == ENXIO)
137				continue;
138			(void)sprintf(errbuf, "SIOCGIFFLAGS: %.*s: %s",
139			    (int)sizeof(ifr.ifr_name), ifr.ifr_name,
140			    strerror(errno));
141			(void)close(fd);
142			return (-1);
143		}
144
145		/* Must be up */
146		if ((ifr.ifr_flags & IFF_UP) == 0)
147			continue;
148
149		/* don't use loopback */
150		if ((ifr.ifr_flags & IFF_LOOPBACK) != 0)
151			continue;
152
153		(void)strncpy(device, ifr.ifr_name, sizeof(ifr.ifr_name));
154		device[sizeof(device) - 1] = '\0';
155#ifdef sun
156		/* Ignore sun virtual interfaces */
157		if (strchr(device, ':') != NULL)
158			continue;
159#endif
160		if (ioctl(fd, SIOCGIFADDR, (char *)&ifr, sizeof(ifr)) < 0) {
161			(void)sprintf(errbuf, "SIOCGIFADDR: %s: %s",
162			    device, strerror(errno));
163			(void)close(fd);
164			return (-1);
165		}
166
167		if (nipaddr >= MAX_IPADDR) {
168			(void)sprintf(errbuf, "Too many interfaces (%d)",
169			    MAX_IPADDR);
170			(void)close(fd);
171			return (-1);
172		}
173		sin = (struct sockaddr_in *)&ifr.ifr_addr;
174		al->addr = sin->sin_addr.s_addr;
175		al->device = strdup(device);
176		++al;
177		++nipaddr;
178	}
179	(void)close(fd);
180
181	*ipaddrp = ifaddrlist;
182	return (nipaddr);
183}
184