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__
42 struct mbuf;
43 struct 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 */
62 int
ifaddrlist(register struct ifaddrlist ** ipaddrp,register char * errbuf)63 ifaddrlist(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) < 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) < 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