r23432: Remove superfluous comment.
[Samba/bb.git] / source3 / lib / interfaces.c
blob839cab1286c7a5a7fb5c6bfc94c2d5a9ad1c47b1
1 /*
2 Unix SMB/CIFS implementation.
3 return a list of network interfaces
4 Copyright (C) Andrew Tridgell 1998
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 /* working out the interfaces for a OS is an incredibly non-portable
23 thing. We have several possible implementations below, and autoconf
24 tries each of them to see what works
26 Note that this file does _not_ include includes.h. That is so this code
27 can be called directly from the autoconf tests. That also means
28 this code cannot use any of the normal Samba debug stuff or defines.
29 This is standalone code.
33 #ifndef AUTOCONF_TEST
34 #include "config.h"
35 #endif
37 #include <unistd.h>
38 #include <stdio.h>
39 #include <sys/types.h>
40 #include <netdb.h>
41 #include <sys/ioctl.h>
42 #include <netdb.h>
43 #include <sys/ioctl.h>
44 #include <sys/time.h>
45 #include <sys/socket.h>
46 #include <netinet/in.h>
47 #include <arpa/inet.h>
49 #ifdef HAVE_SYS_TIME_H
50 #include <sys/time.h>
51 #endif
53 #ifndef SIOCGIFCONF
54 #ifdef HAVE_SYS_SOCKIO_H
55 #include <sys/sockio.h>
56 #endif
57 #endif
59 #ifdef HAVE_STDLIB_H
60 #include <stdlib.h>
61 #endif
63 #ifdef HAVE_STRING_H
64 #include <string.h>
65 #endif
67 #ifdef HAVE_STRINGS_H
68 #include <strings.h>
69 #endif
71 #ifdef __COMPAR_FN_T
72 #define QSORT_CAST (__compar_fn_t)
73 #endif
75 #ifndef QSORT_CAST
76 #define QSORT_CAST (int (*)(const void *, const void *))
77 #endif
79 #ifdef HAVE_NET_IF_H
80 #include <net/if.h>
81 #endif
83 #include "interfaces.h"
85 #if HAVE_IFACE_IFCONF
87 /* this works for Linux 2.2, Solaris 2.5, SunOS4, HPUX 10.20, OSF1
88 V4.0, Ultrix 4.4, SCO Unix 3.2, IRIX 6.4 and FreeBSD 3.2.
90 It probably also works on any BSD style system. */
92 /****************************************************************************
93 get the netmask address for a local interface
94 ****************************************************************************/
95 static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces)
97 struct ifconf ifc;
98 char buff[8192];
99 int fd, i, n;
100 struct ifreq *ifr=NULL;
101 int total = 0;
102 struct in_addr ipaddr;
103 struct in_addr nmask;
104 char *iname;
106 if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
107 return -1;
110 ifc.ifc_len = sizeof(buff);
111 ifc.ifc_buf = buff;
113 if (ioctl(fd, SIOCGIFCONF, &ifc) != 0) {
114 close(fd);
115 return -1;
118 ifr = ifc.ifc_req;
120 n = ifc.ifc_len / sizeof(struct ifreq);
122 /* Loop through interfaces, looking for given IP address */
123 for (i=n-1;i>=0 && total < max_interfaces;i--) {
124 if (ioctl(fd, SIOCGIFADDR, &ifr[i]) != 0) {
125 continue;
128 iname = ifr[i].ifr_name;
129 ipaddr = (*(struct sockaddr_in *)&ifr[i].ifr_addr).sin_addr;
131 if (ioctl(fd, SIOCGIFFLAGS, &ifr[i]) != 0) {
132 continue;
135 if (!(ifr[i].ifr_flags & IFF_UP)) {
136 continue;
139 if (ioctl(fd, SIOCGIFNETMASK, &ifr[i]) != 0) {
140 continue;
143 nmask = ((struct sockaddr_in *)&ifr[i].ifr_addr)->sin_addr;
145 strncpy(ifaces[total].name, iname, sizeof(ifaces[total].name)-1);
146 ifaces[total].name[sizeof(ifaces[total].name)-1] = 0;
147 ifaces[total].ip = ipaddr;
148 ifaces[total].netmask = nmask;
149 total++;
152 close(fd);
154 return total;
157 #define _FOUND_IFACE_ANY
158 #endif /* HAVE_IFACE_IFCONF */
159 #ifdef HAVE_IFACE_IFREQ
161 #ifndef I_STR
162 #include <sys/stropts.h>
163 #endif
165 /****************************************************************************
166 this should cover most of the streams based systems
167 Thanks to Andrej.Borsenkow@mow.siemens.ru for several ideas in this code
168 ****************************************************************************/
169 static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces)
171 struct ifreq ifreq;
172 struct strioctl strioctl;
173 char buff[8192];
174 int fd, i, n;
175 struct ifreq *ifr=NULL;
176 int total = 0;
177 struct in_addr ipaddr;
178 struct in_addr nmask;
179 char *iname;
181 if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
182 return -1;
185 strioctl.ic_cmd = SIOCGIFCONF;
186 strioctl.ic_dp = buff;
187 strioctl.ic_len = sizeof(buff);
188 if (ioctl(fd, I_STR, &strioctl) < 0) {
189 close(fd);
190 return -1;
193 /* we can ignore the possible sizeof(int) here as the resulting
194 number of interface structures won't change */
195 n = strioctl.ic_len / sizeof(struct ifreq);
197 /* we will assume that the kernel returns the length as an int
198 at the start of the buffer if the offered size is a
199 multiple of the structure size plus an int */
200 if (n*sizeof(struct ifreq) + sizeof(int) == strioctl.ic_len) {
201 ifr = (struct ifreq *)(buff + sizeof(int));
202 } else {
203 ifr = (struct ifreq *)buff;
206 /* Loop through interfaces */
208 for (i = 0; i<n && total < max_interfaces; i++) {
209 ifreq = ifr[i];
211 strioctl.ic_cmd = SIOCGIFFLAGS;
212 strioctl.ic_dp = (char *)&ifreq;
213 strioctl.ic_len = sizeof(struct ifreq);
214 if (ioctl(fd, I_STR, &strioctl) != 0) {
215 continue;
218 if (!(ifreq.ifr_flags & IFF_UP)) {
219 continue;
222 strioctl.ic_cmd = SIOCGIFADDR;
223 strioctl.ic_dp = (char *)&ifreq;
224 strioctl.ic_len = sizeof(struct ifreq);
225 if (ioctl(fd, I_STR, &strioctl) != 0) {
226 continue;
229 ipaddr = (*(struct sockaddr_in *) &ifreq.ifr_addr).sin_addr;
230 iname = ifreq.ifr_name;
232 strioctl.ic_cmd = SIOCGIFNETMASK;
233 strioctl.ic_dp = (char *)&ifreq;
234 strioctl.ic_len = sizeof(struct ifreq);
235 if (ioctl(fd, I_STR, &strioctl) != 0) {
236 continue;
239 nmask = ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr;
241 strncpy(ifaces[total].name, iname, sizeof(ifaces[total].name)-1);
242 ifaces[total].name[sizeof(ifaces[total].name)-1] = 0;
243 ifaces[total].ip = ipaddr;
244 ifaces[total].netmask = nmask;
246 total++;
249 close(fd);
251 return total;
254 #define _FOUND_IFACE_ANY
255 #endif /* HAVE_IFACE_IFREQ */
256 #ifdef HAVE_IFACE_AIX
258 /****************************************************************************
259 this one is for AIX (tested on 4.2)
260 ****************************************************************************/
261 static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces)
263 char buff[8192];
264 int fd, i;
265 struct ifconf ifc;
266 struct ifreq *ifr=NULL;
267 struct in_addr ipaddr;
268 struct in_addr nmask;
269 char *iname;
270 int total = 0;
272 if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
273 return -1;
277 ifc.ifc_len = sizeof(buff);
278 ifc.ifc_buf = buff;
280 if (ioctl(fd, SIOCGIFCONF, &ifc) != 0) {
281 close(fd);
282 return -1;
285 ifr = ifc.ifc_req;
287 /* Loop through interfaces */
288 i = ifc.ifc_len;
290 while (i > 0 && total < max_interfaces) {
291 uint_t inc;
293 inc = ifr->ifr_addr.sa_len;
295 if (ioctl(fd, SIOCGIFADDR, ifr) != 0) {
296 goto next;
299 ipaddr = (*(struct sockaddr_in *) &ifr->ifr_addr).sin_addr;
300 iname = ifr->ifr_name;
302 if (ioctl(fd, SIOCGIFFLAGS, ifr) != 0) {
303 goto next;
306 if (!(ifr->ifr_flags & IFF_UP)) {
307 goto next;
310 if (ioctl(fd, SIOCGIFNETMASK, ifr) != 0) {
311 goto next;
314 nmask = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
316 strncpy(ifaces[total].name, iname, sizeof(ifaces[total].name)-1);
317 ifaces[total].name[sizeof(ifaces[total].name)-1] = 0;
318 ifaces[total].ip = ipaddr;
319 ifaces[total].netmask = nmask;
321 total++;
323 next:
325 * Patch from Archie Cobbs (archie@whistle.com). The
326 * addresses in the SIOCGIFCONF interface list have a
327 * minimum size. Usually this doesn't matter, but if
328 * your machine has tunnel interfaces, etc. that have
329 * a zero length "link address", this does matter. */
331 if (inc < sizeof(ifr->ifr_addr))
332 inc = sizeof(ifr->ifr_addr);
333 inc += IFNAMSIZ;
335 ifr = (struct ifreq*) (((char*) ifr) + inc);
336 i -= inc;
340 close(fd);
341 return total;
344 #define _FOUND_IFACE_ANY
345 #endif /* HAVE_IFACE_AIX */
346 #ifndef _FOUND_IFACE_ANY
347 static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces)
349 return -1;
351 #endif
354 static int iface_comp(struct iface_struct *i1, struct iface_struct *i2)
356 int r;
357 r = strcmp(i1->name, i2->name);
358 if (r) return r;
359 r = ntohl(i1->ip.s_addr) - ntohl(i2->ip.s_addr);
360 if (r) return r;
361 r = ntohl(i1->netmask.s_addr) - ntohl(i2->netmask.s_addr);
362 return r;
365 int get_interfaces(struct iface_struct *ifaces, int max_interfaces);
366 /* this wrapper is used to remove duplicates from the interface list generated
367 above */
368 int get_interfaces(struct iface_struct *ifaces, int max_interfaces)
370 int total, i, j;
372 total = _get_interfaces(ifaces, max_interfaces);
373 if (total <= 0) return total;
375 /* now we need to remove duplicates */
376 qsort(ifaces, total, sizeof(ifaces[0]), QSORT_CAST iface_comp);
378 for (i=1;i<total;) {
379 if (iface_comp(&ifaces[i-1], &ifaces[i]) == 0) {
380 for (j=i-1;j<total-1;j++) {
381 ifaces[j] = ifaces[j+1];
383 total--;
384 } else {
385 i++;
389 return total;
393 #ifdef AUTOCONF_TEST
394 /* this is the autoconf driver to test get_interfaces() */
396 int main()
398 struct iface_struct ifaces[MAX_INTERFACES];
399 int total = get_interfaces(ifaces, MAX_INTERFACES);
400 int i;
402 printf("got %d interfaces:\n", total);
403 if (total <= 0) exit(1);
405 for (i=0;i<total;i++) {
406 printf("%-10s ", ifaces[i].name);
407 printf("IP=%s ", inet_ntoa(ifaces[i].ip));
408 printf("NETMASK=%s\n", inet_ntoa(ifaces[i].netmask));
410 return 0;
412 #endif