4 This file is part of avahi.
6 avahi is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 avahi is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
14 Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with avahi; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
26 #include <avahi-common/malloc.h>
33 #include "multicast-lookup.h"
35 struct AvahiMulticastLookup {
36 AvahiMulticastLookupEngine *engine;
39 AvahiKey *key, *cname_key;
41 AvahiMulticastLookupCallback callback;
44 AvahiIfIndex interface;
45 AvahiProtocol protocol;
49 AvahiTimeEvent *all_for_now_event;
51 AVAHI_LLIST_FIELDS(AvahiMulticastLookup, lookups);
52 AVAHI_LLIST_FIELDS(AvahiMulticastLookup, by_key);
55 struct AvahiMulticastLookupEngine {
59 AVAHI_LLIST_HEAD(AvahiMulticastLookup, lookups);
60 AvahiHashmap *lookups_by_key;
65 static void all_for_now_callback(AvahiTimeEvent *e, void* userdata) {
66 AvahiMulticastLookup *l = userdata;
71 avahi_time_event_free(l->all_for_now_event);
72 l->all_for_now_event = NULL;
74 l->callback(l->engine, l->interface, l->protocol, AVAHI_BROWSER_ALL_FOR_NOW, AVAHI_LOOKUP_CALLBACK_MULTICAST, NULL, l->userdata);
77 AvahiMulticastLookup *avahi_multicast_lookup_new(
78 AvahiMulticastLookupEngine *e,
79 AvahiIfIndex interface,
80 AvahiProtocol protocol,
82 AvahiMulticastLookupCallback callback,
85 AvahiMulticastLookup *l, *t;
89 assert(AVAHI_IF_VALID(interface));
90 assert(AVAHI_PROTO_VALID(protocol));
94 l = avahi_new(AvahiMulticastLookup, 1);
97 l->key = avahi_key_ref(key);
98 l->cname_key = avahi_key_new_cname(l->key);
99 l->callback = callback;
100 l->userdata = userdata;
101 l->interface = interface;
102 l->protocol = protocol;
103 l->all_for_now_event = NULL;
104 l->queriers_added = 0;
106 t = avahi_hashmap_lookup(e->lookups_by_key, l->key);
107 AVAHI_LLIST_PREPEND(AvahiMulticastLookup, by_key, t, l);
108 avahi_hashmap_replace(e->lookups_by_key, avahi_key_ref(l->key), t);
110 AVAHI_LLIST_PREPEND(AvahiMulticastLookup, lookups, e->lookups, l);
112 avahi_querier_add_for_all(e->server, interface, protocol, l->key, &ctime);
115 avahi_timeval_add(&ctime, 1000000);
117 l->all_for_now_event = avahi_time_event_new(e->server->time_event_queue, &ctime, all_for_now_callback, l);
122 static void lookup_stop(AvahiMulticastLookup *l) {
127 if (l->queriers_added) {
128 avahi_querier_remove_for_all(l->engine->server, l->interface, l->protocol, l->key);
129 l->queriers_added = 0;
132 if (l->all_for_now_event) {
133 avahi_time_event_free(l->all_for_now_event);
134 l->all_for_now_event = NULL;
138 static void lookup_destroy(AvahiMulticastLookup *l) {
139 AvahiMulticastLookup *t;
144 t = avahi_hashmap_lookup(l->engine->lookups_by_key, l->key);
145 AVAHI_LLIST_REMOVE(AvahiMulticastLookup, by_key, t, l);
147 avahi_hashmap_replace(l->engine->lookups_by_key, avahi_key_ref(l->key), t);
149 avahi_hashmap_remove(l->engine->lookups_by_key, l->key);
151 AVAHI_LLIST_REMOVE(AvahiMulticastLookup, lookups, l->engine->lookups, l);
154 avahi_key_unref(l->key);
157 avahi_key_unref(l->cname_key);
162 void avahi_multicast_lookup_free(AvahiMulticastLookup *l) {
169 l->engine->cleanup_dead = 1;
173 void avahi_multicast_lookup_engine_cleanup(AvahiMulticastLookupEngine *e) {
174 AvahiMulticastLookup *l, *n;
177 while (e->cleanup_dead) {
180 for (l = e->lookups; l; l = n) {
190 AvahiMulticastLookupEngine *engine;
191 AvahiMulticastLookupCallback callback;
193 AvahiKey *key, *cname_key;
194 AvahiInterface *interface;
198 static void* scan_cache_callback(AvahiCache *c, AvahiKey *pattern, AvahiCacheEntry *e, void* userdata) {
199 struct cbdata *cbdata = userdata;
208 cbdata->interface->hardware->index,
209 cbdata->interface->protocol,
211 AVAHI_LOOKUP_CALLBACK_CACHED|AVAHI_LOOKUP_CALLBACK_MULTICAST,
220 static void scan_interface_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, void* userdata) {
221 struct cbdata *cbdata = userdata;
227 cbdata->interface = i;
229 avahi_cache_walk(i->cache, cbdata->key, scan_cache_callback, cbdata);
231 if (cbdata->cname_key)
232 avahi_cache_walk(i->cache, cbdata->cname_key, scan_cache_callback, cbdata);
234 cbdata->interface = NULL;
237 unsigned avahi_multicast_lookup_engine_scan_cache(
238 AvahiMulticastLookupEngine *e,
239 AvahiIfIndex interface,
240 AvahiProtocol protocol,
242 AvahiMulticastLookupCallback callback,
245 struct cbdata cbdata;
251 assert(AVAHI_IF_VALID(interface));
252 assert(AVAHI_PROTO_VALID(protocol));
256 cbdata.cname_key = avahi_key_new_cname(key);
257 cbdata.callback = callback;
258 cbdata.userdata = userdata;
259 cbdata.interface = NULL;
262 avahi_interface_monitor_walk(e->server->monitor, interface, protocol, scan_interface_callback, &cbdata);
264 if (cbdata.cname_key)
265 avahi_key_unref(cbdata.cname_key);
267 return cbdata.n_found;
270 void avahi_multicast_lookup_engine_new_interface(AvahiMulticastLookupEngine *e, AvahiInterface *i) {
271 AvahiMulticastLookup *l;
276 for (l = e->lookups; l; l = l->lookups_next) {
278 if (l->dead || !l->callback)
281 if (l->queriers_added && avahi_interface_match(i, l->interface, l->protocol))
282 avahi_querier_add(i, l->key, NULL);
286 void avahi_multicast_lookup_engine_notify(AvahiMulticastLookupEngine *e, AvahiInterface *i, AvahiRecord *record, AvahiBrowserEvent event) {
287 AvahiMulticastLookup *l;
293 for (l = avahi_hashmap_lookup(e->lookups_by_key, record->key); l; l = l->by_key_next) {
294 if (l->dead || !l->callback)
297 if (avahi_interface_match(i, l->interface, l->protocol))
298 l->callback(e, i->hardware->index, i->protocol, event, AVAHI_LOOKUP_CALLBACK_MULTICAST, record, l->userdata);
302 if (record->key->clazz == AVAHI_DNS_CLASS_IN && record->key->type == AVAHI_DNS_TYPE_CNAME) {
303 /* It's a CNAME record, so we have to scan the all lookups to see if one matches */
305 for (l = e->lookups; l; l = l->lookups_next) {
308 if (l->dead || !l->callback)
311 if ((key = avahi_key_new_cname(l->key))) {
312 if (avahi_key_equal(record->key, key))
313 l->callback(e, i->hardware->index, i->protocol, event, AVAHI_LOOKUP_CALLBACK_MULTICAST, record, l->userdata);
315 avahi_key_unref(key);
321 AvahiMulticastLookupEngine *avahi_multicast_lookup_engine_new(AvahiServer *s) {
322 AvahiMulticastLookupEngine *e;
326 e = avahi_new(AvahiMulticastLookupEngine, 1);
330 /* Initialize lookup list */
331 e->lookups_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, (AvahiFreeFunc) avahi_key_unref, NULL);
332 AVAHI_LLIST_HEAD_INIT(AvahiWideAreaLookup, e->lookups);
337 void avahi_multicast_lookup_engine_free(AvahiMulticastLookupEngine *e) {
341 lookup_destroy(e->lookups);
343 avahi_hashmap_free(e->lookups_by_key);