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#include <sys/param.h>
35#include <sys/file.h>
36#include <sys/ioctl.h>
37#include <sys/socket.h>
38#include <sys/sockio.h>
39#include <sys/time.h>				/* concession to AIX */
40
41#if __STDC__
42struct mbuf;
43struct rtentry;
44#endif
45
46#include <net/if.h>
47#include <netinet/in.h>
48
49#include <ctype.h>
50#include <errno.h>
51#include <memory.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55#include <unistd.h>
56
57#include "ifaddrlist.h"
58
59/*
60 * Return the interface list
61 */
62int
63ifaddrlist(register struct ifaddrlist **ipaddrp, register char *errbuf)
64{
65	register int fd, nipaddr;
66	size_t n;
67	register struct ifreq *ifrp, *ifend, *ifnext;
68	register struct sockaddr_in *sin;
69	register struct ifaddrlist *al;
70	struct ifconf ifc;
71	struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr;
72#define MAX_IPADDR ((int)(sizeof(ibuf) / sizeof(ibuf[0])))
73	static struct ifaddrlist ifaddrlist[MAX_IPADDR];
74	char device[sizeof(ifr.ifr_name) + 1];
75
76	fd = socket(AF_INET, SOCK_DGRAM, 0);
77	if (fd < 0) {
78		(void)sprintf(errbuf, "socket: %s", strerror(errno));
79		return (-1);
80	}
81	ifc.ifc_len = sizeof(ibuf);
82	ifc.ifc_buf = (caddr_t)ibuf;
83
84	if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 ||
85	    ifc.ifc_len < (int)sizeof(struct ifreq)) {
86		if (errno == EINVAL)
87			(void)sprintf(errbuf,
88			    "SIOCGIFCONF: ifreq struct too small (%zu bytes)",
89			    sizeof(ibuf));
90		else
91			(void)sprintf(errbuf, "SIOCGIFCONF: %s",
92			    strerror(errno));
93		(void)close(fd);
94		return (-1);
95	}
96	ifrp = ibuf;
97	ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
98
99	al = ifaddrlist;
100	nipaddr = 0;
101	for (; ifrp < ifend; ifrp = ifnext) {
102		n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
103		if (n < sizeof(*ifrp))
104			ifnext = ifrp + 1;
105		else
106			ifnext = (struct ifreq *)((char *)ifrp + n);
107		if (ifrp->ifr_addr.sa_family != AF_INET)
108			continue;
109		/*
110		 * Need a template to preserve address info that is
111		 * used below to locate the next entry.  (Otherwise,
112		 * SIOCGIFFLAGS stomps over it because the requests
113		 * are returned in a union.)
114		 */
115		strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
116		if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr, sizeof(ifr)) < 0) {
117			if (errno == ENXIO)
118				continue;
119			(void)sprintf(errbuf, "SIOCGIFFLAGS: %.*s: %s",
120			    (int)sizeof(ifr.ifr_name), ifr.ifr_name,
121			    strerror(errno));
122			(void)close(fd);
123			return (-1);
124		}
125
126		/* Must be up */
127		if ((ifr.ifr_flags & IFF_UP) == 0)
128			continue;
129
130
131		(void)strlcpy(device, ifr.ifr_name, sizeof(device));
132#ifdef sun
133		/* Ignore sun virtual interfaces */
134		if (strchr(device, ':') != NULL)
135			continue;
136#endif
137		if (ioctl(fd, SIOCGIFADDR, (char *)&ifr, sizeof(ifr)) < 0) {
138			(void)sprintf(errbuf, "SIOCGIFADDR: %s: %s",
139			    device, strerror(errno));
140			(void)close(fd);
141			return (-1);
142		}
143
144		if (nipaddr >= MAX_IPADDR) {
145			(void)sprintf(errbuf, "Too many interfaces (%d)",
146			    MAX_IPADDR);
147			(void)close(fd);
148			return (-1);
149		}
150		sin = (struct sockaddr_in *)&ifr.ifr_addr;
151		al->addr = sin->sin_addr.s_addr;
152		al->device = strdup(device);
153		++al;
154		++nipaddr;
155	}
156	(void)close(fd);
157
158	*ipaddrp = ifaddrlist;
159	return (nipaddr);
160}
161