2 Unix SMB/CIFS implementation.
4 multiple interface handling
6 Copyright (C) Andrew Tridgell 1992-2005
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.
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.
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/>.
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"
29 /* used for network interfaces */
31 struct interface *next, *prev;
34 struct sockaddr_storage ip;
35 struct sockaddr_storage netmask;
36 struct sockaddr_storage bcast;
42 #define ALLONES ((uint32_t)0xFFFFFFFF)
44 address construction based on a patch from fred@datalync.com
46 #define MKBCADDR(_IP, _NM) ((_IP & _NM) | (_NM ^ ALLONES))
47 #define MKNETADDR(_IP, _NM) (_IP & _NM)
49 /****************************************************************************
50 Try and find an interface that matches an ip. If we cannot, return NULL
51 **************************************************************************/
52 static struct interface *iface_list_find(struct interface *interfaces,
53 const struct sockaddr *ip,
58 if (is_address_any(ip)) {
62 for (i=interfaces;i;i=i->next) {
64 if (same_net(ip, (struct sockaddr *)&i->ip, (struct sockaddr *)&i->netmask)) {
67 } else if (sockaddr_equal((struct sockaddr *)&i->ip, ip)) {
75 /****************************************************************************
76 add an interface to the linked list of interfaces
77 ****************************************************************************/
78 static void add_interface(TALLOC_CTX *mem_ctx, const struct iface_struct *ifs, struct interface **interfaces)
80 char addr[INET6_ADDRSTRLEN];
81 struct interface *iface;
83 if (iface_list_find(*interfaces, (const struct sockaddr *)&ifs->ip, false)) {
84 DEBUG(3,("add_interface: not adding duplicate interface %s\n",
85 print_sockaddr(addr, sizeof(addr), &ifs->ip) ));
89 if (ifs->ip.ss_family == AF_INET &&
90 !(ifs->flags & (IFF_BROADCAST|IFF_LOOPBACK))) {
91 DEBUG(3,("not adding non-broadcast interface %s\n",
96 iface = talloc(*interfaces == NULL ? mem_ctx : *interfaces, struct interface);
100 ZERO_STRUCTPN(iface);
102 iface->name = talloc_strdup(iface, ifs->name);
107 iface->flags = ifs->flags;
109 iface->netmask = ifs->netmask;
110 iface->bcast = ifs->bcast;
112 /* keep string versions too, to avoid people tripping over the implied
113 static in inet_ntoa() */
114 print_sockaddr(addr, sizeof(addr), &iface->ip);
115 DEBUG(4,("added interface %s ip=%s ",
117 iface->ip_s = talloc_strdup(iface, addr);
119 print_sockaddr(addr, sizeof(addr),
121 DEBUG(4,("bcast=%s ", addr));
122 iface->bcast_s = talloc_strdup(iface, addr);
124 print_sockaddr(addr, sizeof(addr),
126 DEBUG(4,("netmask=%s\n", addr));
127 iface->nmask_s = talloc_strdup(iface, addr);
130 this needs to be a ADD_END, as some tests (such as the
131 spoolss notify test) depend on the interfaces ordering
133 DLIST_ADD_END(*interfaces, iface);
137 interpret a single element from a interfaces= config line
139 This handles the following different forms:
141 1) wildcard interface name
147 static void interpret_interface(TALLOC_CTX *mem_ctx,
149 struct iface_struct *probed_ifaces,
151 struct interface **local_interfaces)
153 struct sockaddr_storage ss;
154 struct sockaddr_storage ss_mask;
155 struct sockaddr_storage ss_net;
156 struct sockaddr_storage ss_bcast;
157 struct iface_struct ifs;
161 bool goodaddr = false;
163 /* first check if it is an interface name */
164 for (i=0;i<total_probed;i++) {
165 if (gen_fnmatch(token, probed_ifaces[i].name) == 0) {
166 add_interface(mem_ctx, &probed_ifaces[i],
175 p = strchr_m(token, ';');
178 * skip smbd-specific extra data:
179 * link speed, capabilities, and interface index
184 /* maybe it is a DNS name */
185 p = strchr_m(token,'/');
187 if (!interpret_string_addr(&ss, token, 0)) {
188 DEBUG(2, ("interpret_interface: Can't find address "
193 for (i=0;i<total_probed;i++) {
194 if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&probed_ifaces[i].ip)) {
195 add_interface(mem_ctx, &probed_ifaces[i],
200 DEBUG(2,("interpret_interface: "
201 "can't determine interface for %s\n",
206 /* parse it into an IP address/netmasklength pair */
208 goodaddr = interpret_string_addr(&ss, token, 0);
212 DEBUG(2,("interpret_interface: "
213 "can't determine interface for %s\n",
219 goodaddr = interpret_string_addr(&ss_mask, p, 0);
221 DEBUG(2,("interpret_interface: "
222 "can't determine netmask from %s\n",
228 unsigned long val = strtoul(p, &endp, 0);
229 if (p == endp || (endp && *endp != '\0')) {
230 DEBUG(2,("interpret_interface: "
231 "can't determine netmask value from %s\n",
235 if (!make_netmask(&ss_mask, &ss, val)) {
236 DEBUG(2,("interpret_interface: "
237 "can't apply netmask value %lu from %s\n",
244 make_bcast(&ss_bcast, &ss, &ss_mask);
245 make_net(&ss_net, &ss, &ss_mask);
247 /* Maybe the first component was a broadcast address. */
248 if (sockaddr_equal((struct sockaddr *)&ss_bcast, (struct sockaddr *)&ss) ||
249 sockaddr_equal((struct sockaddr *)&ss_net, (struct sockaddr *)&ss)) {
250 for (i=0;i<total_probed;i++) {
251 if (same_net((struct sockaddr *)&ss,
252 (struct sockaddr *)&probed_ifaces[i].ip,
253 (struct sockaddr *)&ss_mask)) {
254 /* Temporarily replace netmask on
255 * the detected interface - user knows
257 struct sockaddr_storage saved_mask =
258 probed_ifaces[i].netmask;
259 probed_ifaces[i].netmask = ss_mask;
260 DEBUG(2,("interpret_interface: "
261 "using netmask value %s from "
262 "config file on interface %s\n",
264 probed_ifaces[i].name));
265 add_interface(mem_ctx, &probed_ifaces[i],
267 probed_ifaces[i].netmask = saved_mask;
271 DEBUG(2,("interpret_interface: Can't determine ip for "
272 "broadcast address %s\n",
277 /* Just fake up the interface definition. User knows best. */
279 DEBUG(2,("interpret_interface: Adding interface %s\n",
283 (void)strlcpy(ifs.name, token, sizeof(ifs.name));
284 ifs.flags = IFF_BROADCAST;
286 ifs.netmask = ss_mask;
287 ifs.bcast = ss_bcast;
288 add_interface(mem_ctx, &ifs, local_interfaces);
293 load the list of network interfaces
295 void load_interface_list(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx, struct interface **local_interfaces)
297 const char **ptr = lpcfg_interfaces(lp_ctx);
299 struct iface_struct *ifaces = NULL;
302 *local_interfaces = NULL;
304 /* probe the kernel for interfaces */
305 total_probed = get_interfaces(mem_ctx, &ifaces);
307 /* if we don't have a interfaces line then use all interfaces
309 if (!ptr || !*ptr || !**ptr) {
310 if (total_probed <= 0) {
311 DEBUG(0,("ERROR: Could not determine network interfaces, you must use a interfaces config line\n"));
313 for (i=0;i<total_probed;i++) {
314 if (!is_loopback_addr((struct sockaddr *)&ifaces[i].ip)) {
315 add_interface(mem_ctx, &ifaces[i], local_interfaces);
320 while (ptr && *ptr) {
321 interpret_interface(mem_ctx, *ptr, ifaces, total_probed, local_interfaces);
325 if (!*local_interfaces) {
326 DEBUG(0,("WARNING: no network interfaces found\n"));
332 how many interfaces do we have
334 int iface_list_count(struct interface *ifaces)
339 for (i=ifaces;i;i=i->next)
345 return IP of the Nth interface
347 const char *iface_list_n_ip(struct interface *ifaces, int n)
351 for (i=ifaces;i && n;i=i->next)
362 return the first IPv4 interface address we have registered
364 const char *iface_list_first_v4(struct interface *ifaces)
368 for (i=ifaces; i; i=i->next) {
369 if (i->ip.ss_family == AF_INET) {
377 return the first IPv6 interface address we have registered
379 static const char *iface_list_first_v6(struct interface *ifaces)
384 for (i=ifaces; i; i=i->next) {
385 if (i->ip.ss_family == AF_INET6) {
394 check if an interface is IPv4
396 bool iface_list_n_is_v4(struct interface *ifaces, int n)
400 for (i=ifaces;i && n;i=i->next)
404 return i->ip.ss_family == AF_INET;
410 return bcast of the Nth interface
412 const char *iface_list_n_bcast(struct interface *ifaces, int n)
416 for (i=ifaces;i && n;i=i->next)
426 return netmask of the Nth interface
428 const char *iface_list_n_netmask(struct interface *ifaces, int n)
432 for (i=ifaces;i && n;i=i->next)
442 return the local IP address that best matches a destination IP, or
443 our first interface if none match
445 const char *iface_list_best_ip(struct interface *ifaces, const char *dest)
447 struct interface *iface;
448 struct sockaddr_storage ss;
450 if (!interpret_string_addr(&ss, dest, AI_NUMERICHOST)) {
451 return iface_list_n_ip(ifaces, 0);
453 iface = iface_list_find(ifaces, (const struct sockaddr *)&ss, true);
458 if (ss.ss_family == AF_INET6) {
459 return iface_list_first_v6(ifaces);
462 return iface_list_first_v4(ifaces);
466 return true if an IP is one one of our local networks
468 bool iface_list_is_local(struct interface *ifaces, const char *dest)
470 struct sockaddr_storage ss;
472 if (!interpret_string_addr(&ss, dest, AI_NUMERICHOST)) {
475 if (iface_list_find(ifaces, (const struct sockaddr *)&ss, true)) {
482 return true if a IP matches a IP/netmask pair
484 bool iface_list_same_net(const char *ip1, const char *ip2, const char *netmask)
486 struct sockaddr_storage ip1_ss, ip2_ss, nm_ss;
488 if (!interpret_string_addr(&ip1_ss, ip1, AI_NUMERICHOST)) {
491 if (!interpret_string_addr(&ip2_ss, ip2, AI_NUMERICHOST)) {
494 if (!interpret_string_addr(&nm_ss, netmask, AI_NUMERICHOST)) {
498 return same_net((struct sockaddr *)&ip1_ss,
499 (struct sockaddr *)&ip2_ss,
500 (struct sockaddr *)&nm_ss);
504 return the list of wildcard interfaces
505 this will include the IPv4 0.0.0.0, and may include IPv6 ::
507 char **iface_list_wildcard(TALLOC_CTX *mem_ctx)
511 ret = str_list_make(mem_ctx, "::,0.0.0.0", NULL);
513 ret = str_list_make(mem_ctx, "0.0.0.0", NULL);