5 * Copyright (C) 2007-2013 Intel Corporation. All rights reserved.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
38 #define RESOLVER_FLAG_PUBLIC (1 << 0)
41 * Threshold for RDNSS lifetime. Will be used to trigger RS
42 * before RDNSS entries actually expire
44 #define RESOLVER_LIFETIME_REFRESH_THRESHOLD 0.8
52 unsigned int lifetime;
56 static GSList *entry_list = NULL;
57 static bool dnsproxy_enabled = false;
59 struct resolvfile_entry {
65 static GList *resolvfile_list = NULL;
67 static void resolvfile_remove_entries(GList *entries)
71 for (list = entries; list; list = list->next) {
72 struct resolvfile_entry *entry = list->data;
74 resolvfile_list = g_list_remove(resolvfile_list, entry);
76 g_free(entry->server);
77 g_free(entry->domain);
84 static int resolvfile_export(void)
92 content = g_string_new("# Generated by Connection Manager\n");
95 * Domains and nameservers are added in reverse so that the most
96 * recently appended entry is the primary one. No more than
97 * MAXDNSRCH/MAXNS entries are used.
100 for (count = 0, list = g_list_first(resolvfile_list);
101 list && (count < MAXDNSRCH);
102 list = g_list_next(list)) {
103 struct resolvfile_entry *entry = list->data;
109 g_string_append_printf(content, "search ");
111 g_string_append_printf(content, "%s ", entry->domain);
116 g_string_append_printf(content, "\n");
118 for (count = 0, list = g_list_first(resolvfile_list);
119 list && (count < MAXNS);
120 list = g_list_next(list)) {
121 struct resolvfile_entry *entry = list->data;
126 g_string_append_printf(content, "nameserver %s\n",
131 old_umask = umask(022);
133 fd = open("/etc/resolv.conf", O_RDWR | O_CREAT | O_CLOEXEC,
134 S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
140 if (ftruncate(fd, 0) < 0) {
147 if (write(fd, content->str, content->len) < 0)
154 g_string_free(content, TRUE);
160 int __connman_resolvfile_append(int index, const char *domain,
163 struct resolvfile_entry *entry;
165 DBG("index %d server %s", index, server);
170 entry = g_try_new0(struct resolvfile_entry, 1);
174 entry->index = index;
175 entry->domain = g_strdup(domain);
176 entry->server = g_strdup(server);
178 resolvfile_list = g_list_append(resolvfile_list, entry);
180 return resolvfile_export();
183 int __connman_resolvfile_remove(int index, const char *domain,
186 GList *list, *matches = NULL;
188 DBG("index %d server %s", index, server);
190 for (list = resolvfile_list; list; list = g_list_next(list)) {
191 struct resolvfile_entry *entry = list->data;
193 if (index >= 0 && entry->index != index)
196 if (domain && g_strcmp0(entry->domain, domain) != 0)
199 if (g_strcmp0(entry->server, server) != 0)
202 matches = g_list_append(matches, entry);
205 resolvfile_remove_entries(matches);
207 return resolvfile_export();
210 void __connman_resolver_append_fallback_nameservers(void)
214 for (list = entry_list; list; list = list->next) {
215 struct entry_data *entry = list->data;
217 if (entry->index >= 0 && entry->server)
221 for (list = entry_list; list; list = list->next) {
222 struct entry_data *entry = list->data;
224 if (entry->index != -1 || !entry->server)
227 DBG("index %d server %s", entry->index, entry->server);
229 if (dnsproxy_enabled) {
230 __connman_dnsproxy_append(entry->index, entry->domain,
233 __connman_resolvfile_append(entry->index,
234 entry->domain, entry->server);
239 static void remove_fallback_nameservers(void)
243 for (list = entry_list; list; list = list->next) {
244 struct entry_data *entry = list->data;
246 if (entry->index >= 0 || !entry->server)
249 DBG("index %d server %s", entry->index, entry->server);
251 if (dnsproxy_enabled) {
252 __connman_dnsproxy_remove(entry->index, entry->domain,
255 __connman_resolvfile_remove(entry->index,
256 entry->domain, entry->server);
261 static void remove_entries(GSList *entries)
265 for (list = entries; list; list = list->next) {
266 struct entry_data *entry = list->data;
268 entry_list = g_slist_remove(entry_list, entry);
270 if (dnsproxy_enabled) {
271 __connman_dnsproxy_remove(entry->index, entry->domain,
274 __connman_resolvfile_remove(entry->index, entry->domain,
279 g_source_remove(entry->timeout);
280 g_free(entry->server);
281 g_free(entry->domain);
285 g_slist_free(entries);
287 __connman_resolver_append_fallback_nameservers();
290 static gboolean resolver_expire_cb(gpointer user_data)
292 struct entry_data *entry = user_data;
295 DBG("index %d domain %s server %s",
296 entry->index, entry->domain, entry->server);
298 list = g_slist_prepend(NULL, entry);
300 if (entry->index >= 0) {
301 struct connman_service *service;
302 service = __connman_service_lookup_from_index(entry->index);
304 #if defined TIZEN_EXT
305 __connman_service_nameserver_remove(service,
307 CONNMAN_IPCONFIG_TYPE_ALL);
309 __connman_service_nameserver_remove(service,
310 entry->server, true);
314 remove_entries(list);
319 static gboolean resolver_refresh_cb(gpointer user_data)
321 struct entry_data *entry = user_data;
322 unsigned int interval;
323 struct connman_service *service = NULL;
325 /* Round up what we have left from lifetime */
326 interval = entry->lifetime *
327 (1 - RESOLVER_LIFETIME_REFRESH_THRESHOLD) + 1.0;
329 DBG("RDNSS start index %d domain %s "
330 "server %s remaining lifetime %d",
331 entry->index, entry->domain,
332 entry->server, interval);
334 entry->timeout = g_timeout_add_seconds(interval,
335 resolver_expire_cb, entry);
337 if (entry->index >= 0) {
338 service = __connman_service_lookup_from_index(entry->index);
341 * Send Router Solicitation to refresh RDNSS entries
342 * before their lifetime expires
344 __connman_network_refresh_rs_ipv6(
345 __connman_service_get_network(service),
352 static int append_resolver(int index, const char *domain,
353 const char *server, unsigned int lifetime,
356 struct entry_data *entry;
357 unsigned int interval;
359 DBG("index %d domain %s server %s lifetime %d flags %d",
360 index, domain, server, lifetime, flags);
362 if (!server && !domain)
366 if (g_strcmp0(server, "0.0.0.0") == 0)
370 entry = g_try_new0(struct entry_data, 1);
374 entry->index = index;
375 entry->domain = g_strdup(domain);
376 entry->server = g_strdup(server);
377 entry->flags = flags;
378 entry->lifetime = lifetime;
381 entry->family = connman_inet_check_ipaddress(server);
384 interval = lifetime * RESOLVER_LIFETIME_REFRESH_THRESHOLD;
386 DBG("RDNSS start index %d domain %s "
387 "server %s lifetime threshold %d",
388 index, domain, server, interval);
390 entry->timeout = g_timeout_add_seconds(interval,
391 resolver_refresh_cb, entry);
394 if (entry->index >= 0 && entry->server)
395 remove_fallback_nameservers();
397 entry_list = g_slist_append(entry_list, entry);
399 if (dnsproxy_enabled)
400 __connman_dnsproxy_append(entry->index, domain, server);
402 __connman_resolvfile_append(entry->index, domain, server);
405 * We update the service only for those nameservers
406 * that are automagically added via netlink (lifetime > 0)
408 if (server && entry->index >= 0 && lifetime) {
409 struct connman_service *service;
410 service = __connman_service_lookup_from_index(entry->index);
412 #if defined TIZEN_EXT
413 __connman_service_nameserver_append(service,
415 CONNMAN_IPCONFIG_TYPE_ALL);
417 __connman_service_nameserver_append(service,
426 * connman_resolver_append:
427 * @index: network interface index
428 * @domain: domain limitation
429 * @server: server address
431 * Append resolver server address to current list
433 int connman_resolver_append(int index, const char *domain,
438 DBG("index %d domain %s server %s", index, domain, server);
440 if (!server && !domain)
443 for (list = entry_list; list; list = list->next) {
444 struct entry_data *entry = list->data;
446 if (entry->timeout > 0)
449 if (entry->index == index &&
450 g_strcmp0(entry->domain, domain) == 0 &&
451 g_strcmp0(entry->server, server) == 0) {
452 if (dnsproxy_enabled)
453 __connman_dnsproxy_append(entry->index, domain,
460 return append_resolver(index, domain, server, 0, 0);
464 * connman_resolver_append_lifetime:
465 * @index: network interface index
466 * @domain: domain limitation
467 * @server: server address
468 * @timeout: server lifetime in seconds
470 * Append resolver server address to current list
472 int connman_resolver_append_lifetime(int index, const char *domain,
473 const char *server, unsigned int lifetime)
476 unsigned int interval;
478 DBG("index %d domain %s server %s lifetime %d",
479 index, domain, server, lifetime);
481 if (!server && !domain)
484 for (list = entry_list; list; list = list->next) {
485 struct entry_data *entry = list->data;
487 if (entry->timeout == 0 ||
488 entry->index != index ||
489 g_strcmp0(entry->domain, domain) != 0 ||
490 g_strcmp0(entry->server, server) != 0)
493 g_source_remove(entry->timeout);
496 resolver_expire_cb(entry);
500 interval = lifetime * RESOLVER_LIFETIME_REFRESH_THRESHOLD;
502 DBG("RDNSS start index %d domain %s "
503 "server %s lifetime threshold %d",
504 index, domain, server, interval);
506 entry->timeout = g_timeout_add_seconds(interval,
507 resolver_refresh_cb, entry);
511 return append_resolver(index, domain, server, lifetime, 0);
515 * connman_resolver_remove:
516 * @index: network interface index
517 * @domain: domain limitation
518 * @server: server address
520 * Remover resolver server address from current list
522 int connman_resolver_remove(int index, const char *domain, const char *server)
524 GSList *list, *matches = NULL;
526 DBG("index %d domain %s server %s", index, domain, server);
528 for (list = entry_list; list; list = list->next) {
529 struct entry_data *entry = list->data;
531 if (entry->index != index)
534 if (g_strcmp0(entry->domain, domain) != 0)
537 if (g_strcmp0(entry->server, server) != 0)
540 matches = g_slist_prepend(matches, entry);
547 remove_entries(matches);
553 * connman_resolver_remove_all:
554 * @index: network interface index
556 * Remove all resolver server address for the specified interface index
558 int connman_resolver_remove_all(int index)
560 GSList *list, *matches = NULL;
562 DBG("index %d", index);
567 for (list = entry_list; list; list = list->next) {
568 struct entry_data *entry = list->data;
570 if (entry->index != index)
573 matches = g_slist_prepend(matches, entry);
579 remove_entries(matches);
584 int __connman_resolver_redo_servers(int index)
588 if (!dnsproxy_enabled)
591 DBG("index %d", index);
596 for (list = entry_list; list; list = list->next) {
597 struct entry_data *entry = list->data;
599 if (entry->timeout == 0 || entry->index != index)
603 * This function must only check IPv6 server addresses so
604 * do not remove IPv4 name servers unnecessarily.
606 if (entry->family != AF_INET6)
610 * We remove the server, and then re-create so that it will
611 * use proper source addresses when sending DNS queries.
613 __connman_dnsproxy_remove(entry->index, entry->domain,
616 __connman_dnsproxy_append(entry->index, entry->domain,
621 * We want to re-add all search domains back to search
622 * domain lists as they just got removed for RDNSS IPv6-servers
624 * Removal of search domains is not necessary
625 * as there can be only one instance of each search domain
626 * in the each dns-servers search domain list.
629 for (list = entry_list; list; list = list->next) {
630 struct entry_data *entry = list->data;
632 if (entry->index != index)
638 __connman_dnsproxy_append(entry->index, entry->domain,
645 static void free_entry(gpointer data)
647 struct entry_data *entry = data;
648 g_free(entry->domain);
649 g_free(entry->server);
653 static void free_resolvfile(gpointer data)
655 struct resolvfile_entry *entry = data;
656 g_free(entry->domain);
657 g_free(entry->server);
661 int __connman_resolver_init(gboolean dnsproxy)
666 DBG("dnsproxy %d", dnsproxy);
668 /* get autoip nameservers */
669 ns = __connman_inet_get_pnp_nameservers(NULL);
670 for (i = 0; ns && ns[i]; i += 1) {
671 DBG("pnp server %s", ns[i]);
672 append_resolver(i, NULL, ns[i], 86400, 0);
679 if (__connman_dnsproxy_init() < 0) {
680 /* Fall back to resolv.conf */
684 dnsproxy_enabled = true;
686 ns = connman_setting_get_string_list("FallbackNameservers");
687 for (i = 0; ns && ns[i]; i += 1) {
688 DBG("server %s", ns[i]);
689 append_resolver(-1, NULL, ns[i], 0, RESOLVER_FLAG_PUBLIC);
695 void __connman_resolver_cleanup(void)
699 if (dnsproxy_enabled)
700 __connman_dnsproxy_cleanup();
705 for (list = resolvfile_list; list; list = g_list_next(list))
706 free_resolvfile(list->data);
707 g_list_free(resolvfile_list);
708 resolvfile_list = NULL;
710 for (slist = entry_list; slist; slist = g_slist_next(slist))
711 free_entry(slist->data);
712 g_slist_free(entry_list);