2 * Copyright (c) 1996, 1998-2005, 2007-2009
3 * Todd C. Miller <Todd.Miller@courtesan.com>
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 * Sponsored in part by the Defense Advanced Research Projects
18 * Agency (DARPA) and Air Force Research Laboratory, Air Force
19 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
23 * Suppress a warning w/ gcc on Digital UN*X.
24 * The system headers should really do this....
26 #if defined(__osf__) && !defined(__cplusplus)
33 #include <sys/types.h>
34 #include <sys/socket.h>
35 #include <sys/param.h>
37 #include <sys/ioctl.h>
38 #if defined(HAVE_SYS_SOCKIO_H) && !defined(SIOCGIFCONF)
39 # include <sys/sockio.h>
49 #endif /* STDC_HEADERS */
51 # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
56 # ifdef HAVE_STRINGS_H
59 #endif /* HAVE_STRING_H */
62 #endif /* HAVE_UNISTD_H */
66 # include <sys/stream.h>
67 # include <sys/sioctl.h>
68 # include <sys/stropts.h>
69 # define STRSET(cmd, param, len) {strioctl.ic_cmd=(cmd);\
70 strioctl.ic_dp=(param);\
71 strioctl.ic_timout=0;\
72 strioctl.ic_len=(len);}
75 # include <net/soioctl.h>
77 #include <netinet/in.h>
78 #include <arpa/inet.h>
80 #ifdef HAVE_GETIFADDRS
85 #include "interfaces.h"
88 __unused static const char rcsid[] = "$Sudo: interfaces.c,v 1.87 2009/05/25 12:02:41 millert Exp $";
91 /* Minix apparently lacks IFF_LOOPBACK */
93 # define IFF_LOOPBACK 0
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;
148 memcpy(&interfaces[i].addr, &sin->sin_addr,
149 sizeof(struct in_addr));
150 sin = (struct sockaddr_in *)ifa->ifa_netmask;
153 memcpy(&interfaces[i].netmask, &sin->sin_addr,
154 sizeof(struct in_addr));
155 interfaces[i].family = AF_INET;
160 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
163 memcpy(&interfaces[i].addr, &sin6->sin6_addr,
164 sizeof(struct in6_addr));
165 sin6 = (struct sockaddr_in6 *)ifa->ifa_netmask;
168 memcpy(&interfaces[i].netmask, &sin6->sin6_addr,
169 sizeof(struct in6_addr));
170 interfaces[i].family = AF_INET6;
173 #endif /* HAVE_IN6_ADDR */
176 #ifdef HAVE_FREEIFADDRS
177 freeifaddrs(ifaddrs);
183 #elif defined(SIOCGIFCONF) && !defined(STUB_LOAD_INTERFACES)
186 * Allocate and fill in the interfaces global variable with the
187 * machine's ip addresses and netmasks.
192 struct ifconf *ifconf;
193 struct ifreq *ifr, ifr_tmp;
194 struct sockaddr_in *sin;
196 size_t len = sizeof(struct ifconf) + BUFSIZ;
197 char *previfname = "", *ifconf_buf = NULL;
199 struct strioctl strioctl;
202 sock = socket(AF_INET, SOCK_DGRAM, 0);
204 error(1, "cannot open socket");
207 * Get interface configuration or return (leaving num_interfaces == 0)
210 ifconf_buf = erealloc(ifconf_buf, len);
211 ifconf = (struct ifconf *) ifconf_buf;
212 ifconf->ifc_len = len - sizeof(struct ifconf);
213 ifconf->ifc_buf = (caddr_t) (ifconf_buf + sizeof(struct ifconf));
216 STRSET(SIOCGIFCONF, (caddr_t) ifconf, len);
217 if (ioctl(sock, I_STR, (caddr_t) &strioctl) < 0) {
219 /* Note that some kernels return EINVAL if the buffer is too small */
220 if (ioctl(sock, SIOCGIFCONF, (caddr_t) ifconf) < 0 && errno != EINVAL) {
227 /* Break out of loop if we have a big enough buffer. */
228 if (ifconf->ifc_len + sizeof(struct ifreq) < len)
233 /* Allocate space for the maximum number of interfaces that could exist. */
234 if ((n = ifconf->ifc_len / sizeof(struct ifreq)) == 0)
236 interfaces = (struct interface *) emalloc2(n, sizeof(struct interface));
238 /* For each interface, store the ip address and netmask. */
239 for (i = 0; i < ifconf->ifc_len; ) {
240 /* Get a pointer to the current interface. */
241 ifr = (struct ifreq *) &ifconf->ifc_buf[i];
243 /* Set i to the subscript of the next interface. */
244 i += sizeof(struct ifreq);
246 if (ifr->ifr_addr.sa_len > sizeof(ifr->ifr_addr))
247 i += ifr->ifr_addr.sa_len - sizeof(struct sockaddr);
248 #endif /* HAVE_SA_LEN */
250 /* Skip duplicates and interfaces with NULL addresses. */
251 sin = (struct sockaddr_in *) &ifr->ifr_addr;
252 if (sin->sin_addr.s_addr == 0 ||
253 strncmp(previfname, ifr->ifr_name, sizeof(ifr->ifr_name) - 1) == 0)
256 if (ifr->ifr_addr.sa_family != AF_INET)
260 zero_bytes(&ifr_tmp, sizeof(ifr_tmp));
261 strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
262 if (ioctl(sock, SIOCGIFFLAGS, (caddr_t) &ifr_tmp) < 0)
266 /* Skip interfaces marked "down" and "loopback". */
267 if (!ISSET(ifr_tmp.ifr_flags, IFF_UP) ||
268 ISSET(ifr_tmp.ifr_flags, IFF_LOOPBACK))
271 sin = (struct sockaddr_in *) &ifr->ifr_addr;
272 interfaces[num_interfaces].addr.ip4.s_addr = sin->sin_addr.s_addr;
274 /* Stash the name of the interface we saved. */
275 previfname = ifr->ifr_name;
277 /* Get the netmask. */
278 zero_bytes(&ifr_tmp, sizeof(ifr_tmp));
279 strncpy(ifr_tmp.ifr_name, ifr->ifr_name, sizeof(ifr_tmp.ifr_name) - 1);
280 #ifdef SIOCGIFNETMASK
282 STRSET(SIOCGIFNETMASK, (caddr_t) &ifr_tmp, sizeof(ifr_tmp));
283 if (ioctl(sock, I_STR, (caddr_t) &strioctl) == 0) {
285 if (ioctl(sock, SIOCGIFNETMASK, (caddr_t) &ifr_tmp) == 0) {
287 sin = (struct sockaddr_in *) &ifr_tmp.ifr_addr;
289 interfaces[num_interfaces].netmask.ip4.s_addr = sin->sin_addr.s_addr;
293 #endif /* SIOCGIFNETMASK */
294 if (IN_CLASSC(interfaces[num_interfaces].addr.ip4.s_addr))
295 interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSC_NET);
296 else if (IN_CLASSB(interfaces[num_interfaces].addr.ip4.s_addr))
297 interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSB_NET);
299 interfaces[num_interfaces].netmask.ip4.s_addr = htonl(IN_CLASSA_NET);
302 /* Only now can we be sure it was a good/interesting interface. */
303 interfaces[num_interfaces].family = AF_INET;
307 /* If the expected size < real size, realloc the array. */
308 if (n != num_interfaces) {
309 if (num_interfaces != 0)
310 interfaces = (struct interface *) erealloc3(interfaces,
311 num_interfaces, sizeof(struct interface));
319 #else /* !SIOCGIFCONF || STUB_LOAD_INTERFACES */
322 * Stub function for those without SIOCGIFCONF
330 #endif /* SIOCGIFCONF && !STUB_LOAD_INTERFACES */
337 char addrbuf[INET6_ADDRSTRLEN], maskbuf[INET6_ADDRSTRLEN];
340 puts("Local IP address and netmask pairs:");
341 for (i = 0; i < num_interfaces; i++) {
342 switch(interfaces[i].family) {
344 printf("\t%s / ", inet_ntoa(interfaces[i].addr.ip4));
345 puts(inet_ntoa(interfaces[i].netmask.ip4));
349 inet_ntop(AF_INET6, &interfaces[i].addr.ip6,
350 addrbuf, sizeof(addrbuf));
351 inet_ntop(AF_INET6, &interfaces[i].netmask.ip6,
352 maskbuf, sizeof(maskbuf));
353 printf("\t%s / %s\n", addrbuf, maskbuf);
355 #endif /* HAVE_IN6_ADDR */