source: vendor/current/source4/lib/socket/interface.c

Last change on this file was 988, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.3
File size: 12.2 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3
4 multiple interface handling
5
6 Copyright (C) Andrew Tridgell 1992-2005
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20*/
21
22#include "includes.h"
23#include "system/network.h"
24#include "param/param.h"
25#include "lib/socket/netif.h"
26#include "../lib/util/util_net.h"
27#include "../lib/util/dlinklist.h"
28
29/* used for network interfaces */
30struct interface {
31 struct interface *next, *prev;
32 char *name;
33 int flags;
34 struct sockaddr_storage ip;
35 struct sockaddr_storage netmask;
36 struct sockaddr_storage bcast;
37 const char *ip_s;
38 const char *bcast_s;
39 const char *nmask_s;
40};
41
42#define ALLONES ((uint32_t)0xFFFFFFFF)
43/*
44 address construction based on a patch from fred@datalync.com
45*/
46#define MKBCADDR(_IP, _NM) ((_IP & _NM) | (_NM ^ ALLONES))
47#define MKNETADDR(_IP, _NM) (_IP & _NM)
48
49/****************************************************************************
50Try and find an interface that matches an ip. If we cannot, return NULL
51 **************************************************************************/
52static struct interface *iface_list_find(struct interface *interfaces,
53 const struct sockaddr *ip,
54 bool check_mask)
55{
56 struct interface *i;
57
58 if (is_address_any(ip)) {
59 return interfaces;
60 }
61
62 for (i=interfaces;i;i=i->next) {
63 if (check_mask) {
64 if (same_net(ip, (struct sockaddr *)&i->ip, (struct sockaddr *)&i->netmask)) {
65 return i;
66 }
67 } else if (sockaddr_equal((struct sockaddr *)&i->ip, ip)) {
68 return i;
69 }
70 }
71
72 return NULL;
73}
74
75/****************************************************************************
76add an interface to the linked list of interfaces
77****************************************************************************/
78static void add_interface(TALLOC_CTX *mem_ctx, const struct iface_struct *ifs, struct interface **interfaces,
79 bool enable_ipv6)
80{
81 char addr[INET6_ADDRSTRLEN];
82 struct interface *iface;
83
84 if (iface_list_find(*interfaces, (const struct sockaddr *)&ifs->ip, false)) {
85 DEBUG(3,("add_interface: not adding duplicate interface %s\n",
86 print_sockaddr(addr, sizeof(addr), &ifs->ip) ));
87 return;
88 }
89
90 if (ifs->ip.ss_family == AF_INET &&
91 !(ifs->flags & (IFF_BROADCAST|IFF_LOOPBACK))) {
92 DEBUG(3,("not adding non-broadcast interface %s\n",
93 ifs->name ));
94 return;
95 }
96
97 if (!enable_ipv6 && ifs->ip.ss_family != AF_INET) {
98 return;
99 }
100
101 iface = talloc(*interfaces == NULL ? mem_ctx : *interfaces, struct interface);
102 if (iface == NULL)
103 return;
104
105 ZERO_STRUCTPN(iface);
106
107 iface->name = talloc_strdup(iface, ifs->name);
108 if (!iface->name) {
109 SAFE_FREE(iface);
110 return;
111 }
112 iface->flags = ifs->flags;
113 iface->ip = ifs->ip;
114 iface->netmask = ifs->netmask;
115 iface->bcast = ifs->bcast;
116
117 /* keep string versions too, to avoid people tripping over the implied
118 static in inet_ntoa() */
119 print_sockaddr(addr, sizeof(addr), &iface->ip);
120 DEBUG(4,("added interface %s ip=%s ",
121 iface->name, addr));
122 iface->ip_s = talloc_strdup(iface, addr);
123
124 print_sockaddr(addr, sizeof(addr),
125 &iface->bcast);
126 DEBUG(4,("bcast=%s ", addr));
127 iface->bcast_s = talloc_strdup(iface, addr);
128
129 print_sockaddr(addr, sizeof(addr),
130 &iface->netmask);
131 DEBUG(4,("netmask=%s\n", addr));
132 iface->nmask_s = talloc_strdup(iface, addr);
133
134 /*
135 this needs to be a ADD_END, as some tests (such as the
136 spoolss notify test) depend on the interfaces ordering
137 */
138 DLIST_ADD_END(*interfaces, iface);
139}
140
141/**
142interpret a single element from a interfaces= config line
143
144This handles the following different forms:
145
1461) wildcard interface name
1472) DNS name
1483) IP/masklen
1494) ip/mask
1505) bcast/mask
151**/
152static void interpret_interface(TALLOC_CTX *mem_ctx,
153 const char *token,
154 struct iface_struct *probed_ifaces,
155 int total_probed,
156 struct interface **local_interfaces,
157 bool enable_ipv6)
158{
159 struct sockaddr_storage ss;
160 struct sockaddr_storage ss_mask;
161 struct sockaddr_storage ss_net;
162 struct sockaddr_storage ss_bcast;
163 struct iface_struct ifs;
164 char *p;
165 int i;
166 bool added=false;
167 bool goodaddr = false;
168
169 /* first check if it is an interface name */
170 for (i=0;i<total_probed;i++) {
171 if (gen_fnmatch(token, probed_ifaces[i].name) == 0) {
172 add_interface(mem_ctx, &probed_ifaces[i],
173 local_interfaces, enable_ipv6);
174 added = true;
175 }
176 }
177 if (added) {
178 return;
179 }
180
181 p = strchr_m(token, ';');
182 if (p != NULL) {
183 /*
184 * skip smbd-specific extra data:
185 * link speed, capabilities, and interface index
186 */
187 *p = 0;
188 }
189
190 /* maybe it is a DNS name */
191 p = strchr_m(token,'/');
192 if (p == NULL) {
193 if (!interpret_string_addr(&ss, token, 0)) {
194 DEBUG(2, ("interpret_interface: Can't find address "
195 "for %s\n", token));
196 return;
197 }
198
199 for (i=0;i<total_probed;i++) {
200 if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&probed_ifaces[i].ip)) {
201 add_interface(mem_ctx, &probed_ifaces[i],
202 local_interfaces, enable_ipv6);
203 return;
204 }
205 }
206 DEBUG(2,("interpret_interface: "
207 "can't determine interface for %s\n",
208 token));
209 return;
210 }
211
212 /* parse it into an IP address/netmasklength pair */
213 *p = 0;
214 goodaddr = interpret_string_addr(&ss, token, 0);
215 *p++ = '/';
216
217 if (!goodaddr) {
218 DEBUG(2,("interpret_interface: "
219 "can't determine interface for %s\n",
220 token));
221 return;
222 }
223
224 if (strlen(p) > 2) {
225 goodaddr = interpret_string_addr(&ss_mask, p, 0);
226 if (!goodaddr) {
227 DEBUG(2,("interpret_interface: "
228 "can't determine netmask from %s\n",
229 p));
230 return;
231 }
232 } else {
233 char *endp = NULL;
234 unsigned long val = strtoul(p, &endp, 0);
235 if (p == endp || (endp && *endp != '\0')) {
236 DEBUG(2,("interpret_interface: "
237 "can't determine netmask value from %s\n",
238 p));
239 return;
240 }
241 if (!make_netmask(&ss_mask, &ss, val)) {
242 DEBUG(2,("interpret_interface: "
243 "can't apply netmask value %lu from %s\n",
244 val,
245 p));
246 return;
247 }
248 }
249
250 make_bcast(&ss_bcast, &ss, &ss_mask);
251 make_net(&ss_net, &ss, &ss_mask);
252
253 /* Maybe the first component was a broadcast address. */
254 if (sockaddr_equal((struct sockaddr *)&ss_bcast, (struct sockaddr *)&ss) ||
255 sockaddr_equal((struct sockaddr *)&ss_net, (struct sockaddr *)&ss)) {
256 for (i=0;i<total_probed;i++) {
257 if (same_net((struct sockaddr *)&ss,
258 (struct sockaddr *)&probed_ifaces[i].ip,
259 (struct sockaddr *)&ss_mask)) {
260 /* Temporarily replace netmask on
261 * the detected interface - user knows
262 * best.... */
263 struct sockaddr_storage saved_mask =
264 probed_ifaces[i].netmask;
265 probed_ifaces[i].netmask = ss_mask;
266 DEBUG(2,("interpret_interface: "
267 "using netmask value %s from "
268 "config file on interface %s\n",
269 p,
270 probed_ifaces[i].name));
271 add_interface(mem_ctx, &probed_ifaces[i],
272 local_interfaces, enable_ipv6);
273 probed_ifaces[i].netmask = saved_mask;
274 return;
275 }
276 }
277 DEBUG(2,("interpret_interface: Can't determine ip for "
278 "broadcast address %s\n",
279 token));
280 return;
281 }
282
283 /* Just fake up the interface definition. User knows best. */
284
285 DEBUG(2,("interpret_interface: Adding interface %s\n",
286 token));
287
288 ZERO_STRUCT(ifs);
289 (void)strlcpy(ifs.name, token, sizeof(ifs.name));
290 ifs.flags = IFF_BROADCAST;
291 ifs.ip = ss;
292 ifs.netmask = ss_mask;
293 ifs.bcast = ss_bcast;
294 add_interface(mem_ctx, &ifs,
295 local_interfaces, enable_ipv6);
296}
297
298
299/**
300load the list of network interfaces
301**/
302void load_interface_list(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx, struct interface **local_interfaces)
303{
304 const char **ptr = lpcfg_interfaces(lp_ctx);
305 int i;
306 struct iface_struct *ifaces = NULL;
307 int total_probed;
308 bool enable_ipv6 = lpcfg_parm_bool(lp_ctx, NULL, "ipv6", "enable", true);
309
310 *local_interfaces = NULL;
311
312 /* probe the kernel for interfaces */
313 total_probed = get_interfaces(mem_ctx, &ifaces);
314
315 /* if we don't have a interfaces line then use all interfaces
316 except loopback */
317 if (!ptr || !*ptr || !**ptr) {
318 if (total_probed <= 0) {
319 DEBUG(0,("ERROR: Could not determine network interfaces, you must use a interfaces config line\n"));
320 }
321 for (i=0;i<total_probed;i++) {
322 if (!is_loopback_addr((struct sockaddr *)&ifaces[i].ip)) {
323 add_interface(mem_ctx, &ifaces[i], local_interfaces, enable_ipv6);
324 }
325 }
326 }
327
328 while (ptr && *ptr) {
329 interpret_interface(mem_ctx, *ptr, ifaces, total_probed, local_interfaces, enable_ipv6);
330 ptr++;
331 }
332
333 if (!*local_interfaces) {
334 DEBUG(0,("WARNING: no network interfaces found\n"));
335 }
336 talloc_free(ifaces);
337}
338
339/**
340 how many interfaces do we have
341 **/
342int iface_list_count(struct interface *ifaces)
343{
344 int ret = 0;
345 struct interface *i;
346
347 for (i=ifaces;i;i=i->next)
348 ret++;
349 return ret;
350}
351
352/**
353 return IP of the Nth interface
354 **/
355const char *iface_list_n_ip(struct interface *ifaces, int n)
356{
357 struct interface *i;
358
359 for (i=ifaces;i && n;i=i->next)
360 n--;
361
362 if (i) {
363 return i->ip_s;
364 }
365 return NULL;
366}
367
368
369/**
370 return the first IPv4 interface address we have registered
371 **/
372const char *iface_list_first_v4(struct interface *ifaces)
373{
374 struct interface *i;
375
376 for (i=ifaces; i; i=i->next) {
377 if (i->ip.ss_family == AF_INET) {
378 return i->ip_s;
379 }
380 }
381 return NULL;
382}
383
384/**
385 return the first IPv6 interface address we have registered
386 **/
387static const char *iface_list_first_v6(struct interface *ifaces)
388{
389 struct interface *i;
390
391#ifdef HAVE_IPV6
392 for (i=ifaces; i; i=i->next) {
393 if (i->ip.ss_family == AF_INET6) {
394 return i->ip_s;
395 }
396 }
397#endif
398 return NULL;
399}
400
401/**
402 check if an interface is IPv4
403 **/
404bool iface_list_n_is_v4(struct interface *ifaces, int n)
405{
406 struct interface *i;
407
408 for (i=ifaces;i && n;i=i->next)
409 n--;
410
411 if (i) {
412 return i->ip.ss_family == AF_INET;
413 }
414 return false;
415}
416
417/**
418 return bcast of the Nth interface
419 **/
420const char *iface_list_n_bcast(struct interface *ifaces, int n)
421{
422 struct interface *i;
423
424 for (i=ifaces;i && n;i=i->next)
425 n--;
426
427 if (i) {
428 return i->bcast_s;
429 }
430 return NULL;
431}
432
433/**
434 return netmask of the Nth interface
435 **/
436const char *iface_list_n_netmask(struct interface *ifaces, int n)
437{
438 struct interface *i;
439
440 for (i=ifaces;i && n;i=i->next)
441 n--;
442
443 if (i) {
444 return i->nmask_s;
445 }
446 return NULL;
447}
448
449/**
450 return the local IP address that best matches a destination IP, or
451 our first interface if none match
452*/
453const char *iface_list_best_ip(struct interface *ifaces, const char *dest)
454{
455 struct interface *iface;
456 struct sockaddr_storage ss;
457
458 if (!interpret_string_addr(&ss, dest, AI_NUMERICHOST)) {
459 return iface_list_n_ip(ifaces, 0);
460 }
461 iface = iface_list_find(ifaces, (const struct sockaddr *)&ss, true);
462 if (iface) {
463 return iface->ip_s;
464 }
465#ifdef HAVE_IPV6
466 if (ss.ss_family == AF_INET6) {
467 return iface_list_first_v6(ifaces);
468 }
469#endif
470 return iface_list_first_v4(ifaces);
471}
472
473/**
474 return true if an IP is one one of our local networks
475*/
476bool iface_list_is_local(struct interface *ifaces, const char *dest)
477{
478 struct sockaddr_storage ss;
479
480 if (!interpret_string_addr(&ss, dest, AI_NUMERICHOST)) {
481 return false;
482 }
483 if (iface_list_find(ifaces, (const struct sockaddr *)&ss, true)) {
484 return true;
485 }
486 return false;
487}
488
489/**
490 return true if a IP matches a IP/netmask pair
491*/
492bool iface_list_same_net(const char *ip1, const char *ip2, const char *netmask)
493{
494 struct sockaddr_storage ip1_ss, ip2_ss, nm_ss;
495
496 if (!interpret_string_addr(&ip1_ss, ip1, AI_NUMERICHOST)) {
497 return false;
498 }
499 if (!interpret_string_addr(&ip2_ss, ip2, AI_NUMERICHOST)) {
500 return false;
501 }
502 if (!interpret_string_addr(&nm_ss, netmask, AI_NUMERICHOST)) {
503 return false;
504 }
505
506 return same_net((struct sockaddr *)&ip1_ss,
507 (struct sockaddr *)&ip2_ss,
508 (struct sockaddr *)&nm_ss);
509}
510
511/**
512 return the list of wildcard interfaces
513 this will include the IPv4 0.0.0.0, and may include IPv6 ::
514*/
515char **iface_list_wildcard(TALLOC_CTX *mem_ctx)
516{
517 char **ret;
518#ifdef HAVE_IPV6
519 ret = str_list_make(mem_ctx, "::,0.0.0.0", NULL);
520#else
521 ret = str_list_make(mem_ctx, "0.0.0.0", NULL);
522#endif
523 return ret;
524}
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