1 /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
2 /*
3 * Copyright (c) 1994, 1995, 1996, 1997, 1998
4 * The Regents of the University of California. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by the Computer Systems
17 * Engineering Group at Lawrence Berkeley Laboratory.
18 * 4. Neither the name of the University nor of the Laboratory may be used
19 * to endorse or promote products derived from this software without
20 * specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #ifdef HAVE_CONFIG_H
36 #include <config.h>
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 struct mbuf; /* Squelch compiler warnings on some platforms for */
49 struct rtentry; /* declarations in <net/if.h> */
50 #include <net/if.h>
51 #include <netinet/in.h>
52
53 #include <ctype.h>
54 #include <errno.h>
55 #include <memory.h>
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <string.h>
59 #include <unistd.h>
60
61 #include "pcap-int.h"
62
63 #ifdef HAVE_OS_PROTO_H
64 #include "os-proto.h"
65 #endif
66
67 /*
68 * Get a list of all interfaces that are up and that we can open.
69 * Returns -1 on error, 0 otherwise.
70 * The list, as returned through "alldevsp", may be null if no interfaces
71 * were up and could be opened.
72 *
73 * This is the implementation used on platforms that have SIOCGLIFCONF
74 * but don't have "getifaddrs()". (Solaris 8 and later; we use
75 * SIOCGLIFCONF rather than SIOCGIFCONF in order to get IPv6 addresses.)
76 */
77 int
pcap_findalldevs_interfaces(pcap_if_list_t * devlistp,char * errbuf,int (* check_usable)(const char *),get_if_flags_func get_flags_func)78 pcap_findalldevs_interfaces(pcap_if_list_t *devlistp, char *errbuf,
79 int (*check_usable)(const char *), get_if_flags_func get_flags_func)
80 {
81 register int fd4, fd6, fd;
82 register struct lifreq *ifrp, *ifend;
83 struct lifnum ifn;
84 struct lifconf ifc;
85 char *buf = NULL;
86 unsigned buf_size;
87 #ifdef HAVE_SOLARIS
88 char *p, *q;
89 #endif
90 struct lifreq ifrflags, ifrnetmask, ifrbroadaddr, ifrdstaddr;
91 struct sockaddr *netmask, *broadaddr, *dstaddr;
92 int ret = 0;
93
94 /*
95 * Create a socket from which to fetch the list of interfaces,
96 * and from which to fetch IPv4 information.
97 */
98 fd4 = socket(AF_INET, SOCK_DGRAM, 0);
99 if (fd4 < 0) {
100 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
101 errno, "socket: AF_INET");
102 return (-1);
103 }
104
105 /*
106 * Create a socket from which to fetch IPv6 information.
107 */
108 fd6 = socket(AF_INET6, SOCK_DGRAM, 0);
109 if (fd6 < 0) {
110 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
111 errno, "socket: AF_INET6");
112 (void)close(fd4);
113 return (-1);
114 }
115
116 /*
117 * How many entries will SIOCGLIFCONF return?
118 */
119 ifn.lifn_family = AF_UNSPEC;
120 ifn.lifn_flags = 0;
121 ifn.lifn_count = 0;
122 if (ioctl(fd4, SIOCGLIFNUM, (char *)&ifn) < 0) {
123 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
124 errno, "SIOCGLIFNUM");
125 (void)close(fd6);
126 (void)close(fd4);
127 return (-1);
128 }
129
130 /*
131 * Allocate a buffer for those entries.
132 */
133 buf_size = ifn.lifn_count * sizeof (struct lifreq);
134 buf = malloc(buf_size);
135 if (buf == NULL) {
136 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
137 errno, "malloc");
138 (void)close(fd6);
139 (void)close(fd4);
140 return (-1);
141 }
142
143 /*
144 * Get the entries.
145 */
146 ifc.lifc_len = buf_size;
147 ifc.lifc_buf = buf;
148 ifc.lifc_family = AF_UNSPEC;
149 ifc.lifc_flags = 0;
150 memset(buf, 0, buf_size);
151 if (ioctl(fd4, SIOCGLIFCONF, (char *)&ifc) < 0) {
152 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
153 errno, "SIOCGLIFCONF");
154 (void)close(fd6);
155 (void)close(fd4);
156 free(buf);
157 return (-1);
158 }
159
160 /*
161 * Loop over the entries.
162 */
163 ifrp = (struct lifreq *)buf;
164 ifend = (struct lifreq *)(buf + ifc.lifc_len);
165
166 for (; ifrp < ifend; ifrp++) {
167 /*
168 * Skip entries that begin with "dummy".
169 * XXX - what are these? Is this Linux-specific?
170 * Are there platforms on which we shouldn't do this?
171 */
172 if (strncmp(ifrp->lifr_name, "dummy", 5) == 0)
173 continue;
174
175 /*
176 * Can we capture on this device?
177 */
178 if (!(*check_usable)(ifrp->lifr_name)) {
179 /*
180 * No.
181 */
182 continue;
183 }
184
185 /*
186 * IPv6 or not?
187 */
188 if (((struct sockaddr *)&ifrp->lifr_addr)->sa_family == AF_INET6)
189 fd = fd6;
190 else
191 fd = fd4;
192
193 /*
194 * Get the flags for this interface.
195 */
196 strncpy(ifrflags.lifr_name, ifrp->lifr_name,
197 sizeof(ifrflags.lifr_name));
198 if (ioctl(fd, SIOCGLIFFLAGS, (char *)&ifrflags) < 0) {
199 if (errno == ENXIO)
200 continue;
201 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
202 errno, "SIOCGLIFFLAGS: %.*s",
203 (int)sizeof(ifrflags.lifr_name),
204 ifrflags.lifr_name);
205 ret = -1;
206 break;
207 }
208
209 /*
210 * Get the netmask for this address on this interface.
211 */
212 strncpy(ifrnetmask.lifr_name, ifrp->lifr_name,
213 sizeof(ifrnetmask.lifr_name));
214 memcpy(&ifrnetmask.lifr_addr, &ifrp->lifr_addr,
215 sizeof(ifrnetmask.lifr_addr));
216 if (ioctl(fd, SIOCGLIFNETMASK, (char *)&ifrnetmask) < 0) {
217 if (errno == EADDRNOTAVAIL) {
218 /*
219 * Not available.
220 */
221 netmask = NULL;
222 } else {
223 pcap_fmt_errmsg_for_errno(errbuf,
224 PCAP_ERRBUF_SIZE, errno,
225 "SIOCGLIFNETMASK: %.*s",
226 (int)sizeof(ifrnetmask.lifr_name),
227 ifrnetmask.lifr_name);
228 ret = -1;
229 break;
230 }
231 } else
232 netmask = (struct sockaddr *)&ifrnetmask.lifr_addr;
233
234 /*
235 * Get the broadcast address for this address on this
236 * interface (if any).
237 */
238 if (ifrflags.lifr_flags & IFF_BROADCAST) {
239 strncpy(ifrbroadaddr.lifr_name, ifrp->lifr_name,
240 sizeof(ifrbroadaddr.lifr_name));
241 memcpy(&ifrbroadaddr.lifr_addr, &ifrp->lifr_addr,
242 sizeof(ifrbroadaddr.lifr_addr));
243 if (ioctl(fd, SIOCGLIFBRDADDR,
244 (char *)&ifrbroadaddr) < 0) {
245 if (errno == EADDRNOTAVAIL) {
246 /*
247 * Not available.
248 */
249 broadaddr = NULL;
250 } else {
251 pcap_fmt_errmsg_for_errno(errbuf,
252 PCAP_ERRBUF_SIZE, errno,
253 "SIOCGLIFBRDADDR: %.*s",
254 (int)sizeof(ifrbroadaddr.lifr_name),
255 ifrbroadaddr.lifr_name);
256 ret = -1;
257 break;
258 }
259 } else
260 broadaddr = (struct sockaddr *)&ifrbroadaddr.lifr_broadaddr;
261 } else {
262 /*
263 * Not a broadcast interface, so no broadcast
264 * address.
265 */
266 broadaddr = NULL;
267 }
268
269 /*
270 * Get the destination address for this address on this
271 * interface (if any).
272 */
273 if (ifrflags.lifr_flags & IFF_POINTOPOINT) {
274 strncpy(ifrdstaddr.lifr_name, ifrp->lifr_name,
275 sizeof(ifrdstaddr.lifr_name));
276 memcpy(&ifrdstaddr.lifr_addr, &ifrp->lifr_addr,
277 sizeof(ifrdstaddr.lifr_addr));
278 if (ioctl(fd, SIOCGLIFDSTADDR,
279 (char *)&ifrdstaddr) < 0) {
280 if (errno == EADDRNOTAVAIL) {
281 /*
282 * Not available.
283 */
284 dstaddr = NULL;
285 } else {
286 pcap_fmt_errmsg_for_errno(errbuf,
287 PCAP_ERRBUF_SIZE, errno,
288 "SIOCGLIFDSTADDR: %.*s",
289 (int)sizeof(ifrdstaddr.lifr_name),
290 ifrdstaddr.lifr_name);
291 ret = -1;
292 break;
293 }
294 } else
295 dstaddr = (struct sockaddr *)&ifrdstaddr.lifr_dstaddr;
296 } else
297 dstaddr = NULL;
298
299 #ifdef HAVE_SOLARIS
300 /*
301 * If this entry has a colon followed by a number at
302 * the end, it's a logical interface. Those are just
303 * the way you assign multiple IP addresses to a real
304 * interface, so an entry for a logical interface should
305 * be treated like the entry for the real interface;
306 * we do that by stripping off the ":" and the number.
307 */
308 p = strchr(ifrp->lifr_name, ':');
309 if (p != NULL) {
310 /*
311 * We have a ":"; is it followed by a number?
312 */
313 q = p + 1;
314 while (isdigit((unsigned char)*q))
315 q++;
316 if (*q == '\0') {
317 /*
318 * All digits after the ":" until the end.
319 * Strip off the ":" and everything after
320 * it.
321 */
322 *p = '\0';
323 }
324 }
325 #endif
326
327 /*
328 * Add information for this address to the list.
329 */
330 if (add_addr_to_if(devlistp, ifrp->lifr_name,
331 ifrflags.lifr_flags, get_flags_func,
332 (struct sockaddr *)&ifrp->lifr_addr,
333 sizeof (struct sockaddr_storage),
334 netmask, sizeof (struct sockaddr_storage),
335 broadaddr, sizeof (struct sockaddr_storage),
336 dstaddr, sizeof (struct sockaddr_storage), errbuf) < 0) {
337 ret = -1;
338 break;
339 }
340 }
341 free(buf);
342 (void)close(fd6);
343 (void)close(fd4);
344
345 return (ret);
346 }
347