2 * Copyright (c) 1996, 1998-2005 Todd C. Miller <Todd.Miller@courtesan.com>
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 * Sponsored in part by the Defense Advanced Research Projects
17 * Agency (DARPA) and Air Force Research Laboratory, Air Force
18 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
22 * Suppress a warning w/ gcc on Digital UN*X.
23 * The system headers should really do this....
25 #if defined(__osf__) && !defined(__cplusplus)
32 #include <sys/types.h>
33 #include <sys/socket.h>
34 #include <sys/param.h>
36 #include <sys/ioctl.h>
37 #if defined(HAVE_SYS_SOCKIO_H) && !defined(SIOCGIFCONF)
38 # include <sys/sockio.h>
48 #endif /* STDC_HEADERS */
50 # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
55 # ifdef HAVE_STRINGS_H
58 #endif /* HAVE_STRING_H */
61 #endif /* HAVE_UNISTD_H */
65 # include "emul/err.h"
66 #endif /* HAVE_ERR_H */
70 # include <sys/stream.h>
71 # include <sys/sioctl.h>
72 # include <sys/stropts.h>
73 # define STRSET(cmd, param, len) {strioctl.ic_cmd=(cmd);\
74 strioctl.ic_dp=(param);\
75 strioctl.ic_timout=0;\
76 strioctl.ic_len=(len);}
79 # include <net/soioctl.h>
81 #include <netinet/in.h>
82 #include <arpa/inet.h>
84 #ifdef HAVE_GETIFADDRS
89 #include "interfaces.h"
92 __unused static const char rcsid[] = "$Sudo: interfaces.c,v 1.72.2.8 2007/11/27 17:06:53 millert Exp $";
96 #ifdef HAVE_GETIFADDRS
99 * Allocate and fill in the interfaces global variable with the
100 * machine's ip addresses and netmasks.
105 struct ifaddrs *ifa, *ifaddrs;
106 struct sockaddr_in *sin;
108 struct sockaddr_in6 *sin6;
112 if (getifaddrs(&ifaddrs))
115 /* Allocate space for the interfaces list. */
116 for (ifa = ifaddrs; ifa != NULL; ifa = ifa -> ifa_next) {
117 /* Skip interfaces marked "down" and "loopback". */
118 if (ifa->ifa_addr == NULL || !ISSET(ifa->ifa_flags, IFF_UP) ||
119 ISSET(ifa->ifa_flags, IFF_LOOPBACK))
122 switch(ifa->ifa_addr->sa_family) {
131 if (num_interfaces == 0)
134 (struct interface *) emalloc2(num_interfaces, sizeof(struct interface));
136 /* Store the ip addr / netmask pairs. */
137 for (ifa = ifaddrs, i = 0; ifa != NULL; ifa = ifa -> ifa_next) {
138 /* Skip interfaces marked "down" and "loopback". */
139 if (ifa->ifa_addr == NULL || !ISSET(ifa->ifa_flags, IFF_UP) ||
140 ISSET(ifa->ifa_flags, IFF_LOOPBACK))
143 switch(ifa->ifa_addr->sa_family) {
145 sin = (struct sockaddr_in *)ifa->ifa_addr;
146 memcpy(&interfaces[i].addr, &sin->sin_addr,
147 sizeof(struct in_addr));
148 sin = (struct sockaddr_in *)ifa->ifa_netmask;
149 memcpy(&interfaces[i].netmask, &sin->sin_addr,
150 sizeof(struct in_addr));
151 interfaces[i].family = AF_INET;
156 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
157 memcpy(&interfaces[i].addr, &sin6->sin6_addr,
158 sizeof(struct in6_addr));
159 sin6 = (struct sockaddr_in6 *)ifa->ifa_netmask;
160 memcpy(&interfaces[i].netmask, &sin6->sin6_addr,
161 sizeof(struct in6_addr));
162 interfaces[i].family = AF_INET6;
165 #endif /* HAVE_IN6_ADDR */
168 #ifdef HAVE_FREEIFADDRS
169 freeifaddrs(ifaddrs);
175 #elif defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)
178 * Allocate and fill in the interfaces global variable with the
179 * machine's ip addresses and netmasks.
184 struct ifconf *ifconf;
185 struct ifreq *ifr, ifr_tmp;
186 struct sockaddr_in *sin;
188 size_t len = sizeof(struct ifconf) + BUFSIZ;
189 char *previfname = "", *ifconf_buf = NULL;
191 struct strioctl strioctl;
194 sock = socket(AF_INET, SOCK_DGRAM, 0);
196 err(1, "cannot open socket");
199 * Get interface configuration or return (leaving num_interfaces == 0)
202 ifconf_buf = erealloc(ifconf_buf, len);
203 ifconf = (struct ifconf *) ifconf_buf;
204 ifconf->ifc_len = len - sizeof(struct ifconf);
205 ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf));
208 STRSET(SIOCGIFCONF, (caddr_t) ifconf, len);
209 if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) {
211 /* Note that some kernels return EINVAL if the buffer is too small */
212 if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0 && errno != EINVAL) {
219 /* Break out of loop if we have a big enough buffer. */
220 if (ifconf->ifc_len + sizeof(struct ifreq) < len)
225 /* Allocate space for the maximum number of interfaces that could exist. */
226 if ((n = ifconf->ifc_len / sizeof(struct ifreq)) == 0)
228 interfaces = (struct interface *) emalloc2(n, sizeof(struct interface));
230 /* For each interface, store the ip address and netmask. */
231 for (i = 0; i < ifconf->ifc_len; ) {
232 /* Get a pointer to the current interface. */
233 ifr = (struct ifreq *) &ifconf->ifc_buf[i];
235 /* Set i to the subscript of the next interface. */
236 i += sizeof(struct ifreq);
238 if (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr))
239 i += ifr->ifr_addr.sa_len - sizeof(struct sockaddr);
240 #endif /* HAVE_SA_LEN */
242 /* Skip duplicates and interfaces with NULL addresses. */
243 sin = (struct sockaddr_in *) &ifr->ifr_addr;
244 if (sin->sin_addr.s_addr == 0 ||
245 strncmp(previfname, ifr->ifr_name, sizeof(ifr->ifr_name) - 1) == 0)
248 if (ifr->ifr_addr.sa_family != AF_INET)
252 memset(&ifr_tmp, 0, sizeof(ifr_tmp));
253 strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
254 if (ioctl(sock, SIOCGIFFLAGS, (caddr_t) &ifr_tmp) < 0)
258 /* Skip interfaces marked "down" and "loopback". */
259 if (!ISSET(ifr_tmp.ifr_flags, IFF_UP) ||
260 ISSET(ifr_tmp.ifr_flags, IFF_LOOPBACK))
263 sin = (struct sockaddr_in *) &ifr->ifr_addr;
264 interfaces[num_interfaces].addr.ip4.s_addr = sin->sin_addr.s_addr;
266 /* Stash the name of the interface we saved. */
267 previfname = ifr->ifr_name;
269 /* Get the netmask. */
270 (void) memset(&ifr_tmp, 0, sizeof(ifr_tmp));
271 strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
272 #ifdef SIOCGIFNETMASK
274 STRSET(SIOCGIFNETMASK, (caddr_t) &ifr_tmp, sizeof(ifr_tmp));
275 if (ioctl(sock, I_STR, (caddr_t) &strioctl) == 0) {
277 if (ioctl(sock, SIOCGIFNETMASK, (caddr_t) &ifr_tmp) == 0) {
279 sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
281 interfaces[num_interfaces].netmask.ip4.s_addr = sin->sin_addr.s_addr;
285 #endif /* SIOCGIFNETMASK */
286 if (IN_CLASSC(interfaces[num_interfaces].addr.ip4.s_addr))
287 interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSC_NET);
288 else if (IN_CLASSB(interfaces[num_interfaces].addr.ip4.s_addr))
289 interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSB_NET);
291 interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSA_NET);
294 /* Only now can we be sure it was a good/interesting interface. */
295 interfaces[num_interfaces].family = AF_INET;
299 /* If the expected size < real size, realloc the array. */
300 if (n != num_interfaces) {
301 if (num_interfaces != 0)
302 interfaces = (struct interface *) erealloc3(interfaces,
303 num_interfaces, sizeof(struct interface));
311 #else /* !SIOCGIFCONF || STUB_LOAD_INTERFACES */
314 * Stub function for those without SIOCGIFCONF
322 #endif /* SIOCGIFCONF && !STUB_LOAD_INTERFACES */
329 char addrbuf[INET6_ADDRSTRLEN], maskbuf[INET6_ADDRSTRLEN];
332 puts("Local IP address and netmask pairs:");
333 for (i = 0; i < num_interfaces; i++) {
334 switch(interfaces[i].family) {
336 printf("\t%s / ", inet_ntoa(interfaces[i].addr.ip4));
337 puts(inet_ntoa(interfaces[i].netmask.ip4));
341 inet_ntop(AF_INET6, &interfaces[i].addr.ip6,
342 addrbuf, sizeof(addrbuf));
343 inet_ntop(AF_INET6, &interfaces[i].netmask.ip6,
344 maskbuf, sizeof(maskbuf));
345 printf("\t%s / %s\n", addrbuf, maskbuf);
347 #endif /* HAVE_IN6_ADDR */