1 /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
3 * Copyright (c) 1994, 1995, 1996, 1997, 1998
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16 * This product includes software developed by the Computer Systems
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39 #include <sys/param.h>
41 #include <sys/ioctl.h>
42 #include <sys/socket.h>
43 #ifdef HAVE_SYS_SOCKIO_H
44 #include <sys/sockio.h>
46 #include <sys/time.h> /* concession to AIX */
48 struct mbuf; /* Squelch compiler warnings on some platforms for */
49 struct rtentry; /* declarations in <net/if.h> */
51 #include <netinet/in.h>
63 #ifdef HAVE_OS_PROTO_H
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.
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.)
78 pcap_findalldevs_interfaces(pcap_if_t **alldevsp, char *errbuf)
80 pcap_if_t *devlist = NULL;
81 register int fd4, fd6, fd;
82 register struct lifreq *ifrp, *ifend;
90 struct lifreq ifrflags, ifrnetmask, ifrbroadaddr, ifrdstaddr;
91 struct sockaddr *netmask, *broadaddr, *dstaddr;
95 * Create a socket from which to fetch the list of interfaces,
96 * and from which to fetch IPv4 information.
98 fd4 = socket(AF_INET, SOCK_DGRAM, 0);
100 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
101 "socket: %s", pcap_strerror(errno));
106 * Create a socket from which to fetch IPv6 information.
108 fd6 = socket(AF_INET6, SOCK_DGRAM, 0);
110 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
111 "socket: %s", pcap_strerror(errno));
117 * How many entries will SIOCGLIFCONF return?
119 ifn.lifn_family = AF_UNSPEC;
122 if (ioctl(fd4, SIOCGLIFNUM, (char *)&ifn) < 0) {
123 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
124 "SIOCGLIFNUM: %s", pcap_strerror(errno));
131 * Allocate a buffer for those entries.
133 buf_size = ifn.lifn_count * sizeof (struct lifreq);
134 buf = malloc(buf_size);
136 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
137 "malloc: %s", pcap_strerror(errno));
146 ifc.lifc_len = buf_size;
148 ifc.lifc_family = AF_UNSPEC;
150 memset(buf, 0, buf_size);
151 if (ioctl(fd4, SIOCGLIFCONF, (char *)&ifc) < 0) {
152 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
153 "SIOCGLIFCONF: %s", pcap_strerror(errno));
161 * Loop over the entries.
163 ifrp = (struct lifreq *)buf;
164 ifend = (struct lifreq *)(buf + ifc.lifc_len);
166 for (; ifrp < ifend; ifrp++) {
170 if (((struct sockaddr *)&ifrp->lifr_addr)->sa_family == AF_INET6)
176 * Skip entries that begin with "dummy".
177 * XXX - what are these? Is this Linux-specific?
178 * Are there platforms on which we shouldn't do this?
180 if (strncmp(ifrp->lifr_name, "dummy", 5) == 0)
185 * Skip entries that have a ":" followed by a number
186 * at the end - those are Solaris virtual interfaces
187 * on which you can't capture.
189 p = strchr(ifrp->lifr_name, ':');
192 * We have a ":"; is it followed by a number?
194 while (isdigit((unsigned char)*p))
198 * All digits after the ":" until the end.
206 * Get the flags for this interface.
208 strncpy(ifrflags.lifr_name, ifrp->lifr_name,
209 sizeof(ifrflags.lifr_name));
210 if (ioctl(fd, SIOCGLIFFLAGS, (char *)&ifrflags) < 0) {
213 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
214 "SIOCGLIFFLAGS: %.*s: %s",
215 (int)sizeof(ifrflags.lifr_name),
217 pcap_strerror(errno));
223 * Get the netmask for this address on this interface.
225 strncpy(ifrnetmask.lifr_name, ifrp->lifr_name,
226 sizeof(ifrnetmask.lifr_name));
227 memcpy(&ifrnetmask.lifr_addr, &ifrp->lifr_addr,
228 sizeof(ifrnetmask.lifr_addr));
229 if (ioctl(fd, SIOCGLIFNETMASK, (char *)&ifrnetmask) < 0) {
230 if (errno == EADDRNOTAVAIL) {
236 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
237 "SIOCGLIFNETMASK: %.*s: %s",
238 (int)sizeof(ifrnetmask.lifr_name),
239 ifrnetmask.lifr_name,
240 pcap_strerror(errno));
245 netmask = (struct sockaddr *)&ifrnetmask.lifr_addr;
248 * Get the broadcast address for this address on this
249 * interface (if any).
251 if (ifrflags.lifr_flags & IFF_BROADCAST) {
252 strncpy(ifrbroadaddr.lifr_name, ifrp->lifr_name,
253 sizeof(ifrbroadaddr.lifr_name));
254 memcpy(&ifrbroadaddr.lifr_addr, &ifrp->lifr_addr,
255 sizeof(ifrbroadaddr.lifr_addr));
256 if (ioctl(fd, SIOCGLIFBRDADDR,
257 (char *)&ifrbroadaddr) < 0) {
258 if (errno == EADDRNOTAVAIL) {
264 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
265 "SIOCGLIFBRDADDR: %.*s: %s",
266 (int)sizeof(ifrbroadaddr.lifr_name),
267 ifrbroadaddr.lifr_name,
268 pcap_strerror(errno));
273 broadaddr = (struct sockaddr *)&ifrbroadaddr.lifr_broadaddr;
276 * Not a broadcast interface, so no broadcast
283 * Get the destination address for this address on this
284 * interface (if any).
286 if (ifrflags.lifr_flags & IFF_POINTOPOINT) {
287 strncpy(ifrdstaddr.lifr_name, ifrp->lifr_name,
288 sizeof(ifrdstaddr.lifr_name));
289 memcpy(&ifrdstaddr.lifr_addr, &ifrp->lifr_addr,
290 sizeof(ifrdstaddr.lifr_addr));
291 if (ioctl(fd, SIOCGLIFDSTADDR,
292 (char *)&ifrdstaddr) < 0) {
293 if (errno == EADDRNOTAVAIL) {
299 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
300 "SIOCGLIFDSTADDR: %.*s: %s",
301 (int)sizeof(ifrdstaddr.lifr_name),
302 ifrdstaddr.lifr_name,
303 pcap_strerror(errno));
308 dstaddr = (struct sockaddr *)&ifrdstaddr.lifr_dstaddr;
314 * If this entry has a colon followed by a number at
315 * the end, it's a logical interface. Those are just
316 * the way you assign multiple IP addresses to a real
317 * interface, so an entry for a logical interface should
318 * be treated like the entry for the real interface;
319 * we do that by stripping off the ":" and the number.
321 p = strchr(ifrp->lifr_name, ':');
324 * We have a ":"; is it followed by a number?
327 while (isdigit((unsigned char)*q))
331 * All digits after the ":" until the end.
332 * Strip off the ":" and everything after
341 * Add information for this address to the list.
343 if (add_addr_to_iflist(&devlist, ifrp->lifr_name,
344 ifrflags.lifr_flags, (struct sockaddr *)&ifrp->lifr_addr,
345 sizeof (struct sockaddr_storage),
346 netmask, sizeof (struct sockaddr_storage),
347 broadaddr, sizeof (struct sockaddr_storage),
348 dstaddr, sizeof (struct sockaddr_storage), errbuf) < 0) {
359 * We had an error; free the list we've been constructing.
361 if (devlist != NULL) {
362 pcap_freealldevs(devlist);