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
35 static 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/file.h>
41 #include <sys/ioctl.h>
42 #include <sys/socket.h>
43 #ifdef HAVE_SYS_SOCKIO_H
44 #include <sys/sockio.h>
45 #endif
46 #include <sys/time.h> /* concession to AIX */
47
48 #if __STDC__
49 struct mbuf;
50 struct rtentry;
51 #endif
52
53 #include <net/if.h>
54 #include <netinet/in.h>
55
56 #include <ctype.h>
57 #include <errno.h>
58 #include <memory.h>
59 #include <stdio.h>
60 #include <stdlib.h>
61 #include <string.h>
62 #include <unistd.h>
63
64 #include "ifaddrlist.h"
65
66 /*
67 * Return the interface list
68 */
69 int
ifaddrlist(register struct ifaddrlist ** ipaddrp,register char * errbuf)70 ifaddrlist(register struct ifaddrlist **ipaddrp, register char *errbuf)
71 {
72 register int fd, nipaddr;
73 #ifdef HAVE_SOCKADDR_SA_LEN
74 size_t n;
75 #endif
76 register struct ifreq *ifrp, *ifend, *ifnext;
77 register struct sockaddr_in *sin;
78 register struct ifaddrlist *al;
79 struct ifconf ifc;
80 struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr;
81 #define MAX_IPADDR ((int)(sizeof(ibuf) / sizeof(ibuf[0])))
82 static struct ifaddrlist ifaddrlist[MAX_IPADDR];
83 char device[sizeof(ifr.ifr_name) + 1];
84
85 fd = socket(AF_INET, SOCK_DGRAM, 0);
86 if (fd < 0) {
87 (void)sprintf(errbuf, "socket: %s", strerror(errno));
88 return (-1);
89 }
90 ifc.ifc_len = sizeof(ibuf);
91 ifc.ifc_buf = (caddr_t)ibuf;
92
93 if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 ||
94 ifc.ifc_len < (int)sizeof(struct ifreq)) {
95 if (errno == EINVAL)
96 (void)sprintf(errbuf,
97 "SIOCGIFCONF: ifreq struct too small (%zu bytes)",
98 sizeof(ibuf));
99 else
100 (void)sprintf(errbuf, "SIOCGIFCONF: %s",
101 strerror(errno));
102 (void)close(fd);
103 return (-1);
104 }
105 ifrp = ibuf;
106 ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
107
108 al = ifaddrlist;
109 nipaddr = 0;
110 for (; ifrp < ifend; ifrp = ifnext) {
111 #ifdef HAVE_SOCKADDR_SA_LEN
112 n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
113 if (n < sizeof(*ifrp))
114 ifnext = ifrp + 1;
115 else
116 ifnext = (struct ifreq *)((char *)ifrp + n);
117 if (ifrp->ifr_addr.sa_family != AF_INET)
118 continue;
119 #else
120 ifnext = ifrp + 1;
121 #endif
122 /*
123 * Need a template to preserve address info that is
124 * used below to locate the next entry. (Otherwise,
125 * SIOCGIFFLAGS stomps over it because the requests
126 * are returned in a union.)
127 */
128 strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
129 if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
130 if (errno == ENXIO)
131 continue;
132 (void)sprintf(errbuf, "SIOCGIFFLAGS: %.*s: %s",
133 (int)sizeof(ifr.ifr_name), ifr.ifr_name,
134 strerror(errno));
135 (void)close(fd);
136 return (-1);
137 }
138
139 /* Must be up */
140 if ((ifr.ifr_flags & IFF_UP) == 0)
141 continue;
142
143
144 (void)strncpy(device, ifr.ifr_name, sizeof(ifr.ifr_name));
145 device[sizeof(device) - 1] = '\0';
146 #ifdef sun
147 /* Ignore sun virtual interfaces */
148 if (strchr(device, ':') != NULL)
149 continue;
150 #endif
151 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
152 (void)sprintf(errbuf, "SIOCGIFADDR: %s: %s",
153 device, strerror(errno));
154 (void)close(fd);
155 return (-1);
156 }
157
158 if (nipaddr >= MAX_IPADDR) {
159 (void)sprintf(errbuf, "Too many interfaces (%d)",
160 MAX_IPADDR);
161 (void)close(fd);
162 return (-1);
163 }
164 sin = (struct sockaddr_in *)&ifr.ifr_addr;
165 al->addr = sin->sin_addr.s_addr;
166 al->device = strdup(device);
167 ++al;
168 ++nipaddr;
169 }
170 (void)close(fd);
171
172 *ipaddrp = ifaddrlist;
173 return (nipaddr);
174 }
175