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/timeval.h>
27 #include <avahi-common/malloc.h>
28 #include <avahi-common/error.h>
32 #define TIMEOUT_MSEC 5000
34 struct AvahiSAddressResolver {
38 AvahiSRecordBrowser *record_browser;
40 AvahiSAddressResolverCallback callback;
43 AvahiRecord *ptr_record;
44 AvahiIfIndex interface;
45 AvahiProtocol protocol;
46 AvahiLookupResultFlags flags;
48 int retry_with_multicast;
51 AvahiTimeEvent *time_event;
53 AVAHI_LLIST_FIELDS(AvahiSAddressResolver, resolver);
56 static void finish(AvahiSAddressResolver *r, AvahiResolverEvent event) {
60 avahi_time_event_free(r->time_event);
65 case AVAHI_RESOLVER_NOT_FOUND:
66 case AVAHI_RESOLVER_TIMEOUT:
67 case AVAHI_RESOLVER_FAILURE:
68 r->callback(r, r->interface, r->protocol, event, &r->address, NULL, r->flags, r->userdata);
71 case AVAHI_RESOLVER_FOUND:
72 assert(r->ptr_record);
73 r->callback(r, r->interface, r->protocol, event, &r->address, r->ptr_record->data.ptr.name, r->flags, r->userdata);
78 static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
79 AvahiSAddressResolver *r = userdata;
84 finish(r, AVAHI_RESOLVER_TIMEOUT);
87 static void start_timeout(AvahiSAddressResolver *r) {
94 avahi_elapse_time(&tv, TIMEOUT_MSEC, 0);
95 r->time_event = avahi_time_event_new(r->server->time_event_queue, &tv, time_event_callback, r);
98 static void record_browser_callback(
99 AvahiSRecordBrowser*rr,
100 AvahiIfIndex interface,
101 AvahiProtocol protocol,
102 AvahiBrowserEvent event,
104 AvahiLookupResultFlags flags,
107 AvahiSAddressResolver *r = userdata;
114 case AVAHI_BROWSER_NEW:
116 assert(record->key->type == AVAHI_DNS_TYPE_PTR);
118 if (r->interface > 0 && interface != r->interface)
121 if (r->protocol != AVAHI_PROTO_UNSPEC && protocol != r->protocol)
124 if (r->interface <= 0)
125 r->interface = interface;
127 if (r->protocol == AVAHI_PROTO_UNSPEC)
128 r->protocol = protocol;
130 if (!r->ptr_record) {
131 r->ptr_record = avahi_record_ref(record);
134 finish(r, AVAHI_RESOLVER_FOUND);
138 case AVAHI_BROWSER_REMOVE:
140 assert(record->key->type == AVAHI_DNS_TYPE_PTR);
142 if (r->ptr_record && avahi_record_equal_no_ttl(record, r->ptr_record)) {
143 avahi_record_unref(r->ptr_record);
144 r->ptr_record = NULL;
147 /** Look for a replacement */
148 avahi_s_record_browser_restart(r->record_browser);
154 case AVAHI_BROWSER_CACHE_EXHAUSTED:
155 case AVAHI_BROWSER_ALL_FOR_NOW:
158 case AVAHI_BROWSER_NOT_FOUND:
160 if (r->retry_with_multicast) {
161 r->retry_with_multicast = 0;
163 avahi_s_record_browser_free(r->record_browser);
164 r->record_browser = avahi_s_record_browser_new(r->server, r->interface, r->protocol, r->key, AVAHI_LOOKUP_USE_MULTICAST, record_browser_callback, r);
166 if (r->record_browser) {
174 case AVAHI_BROWSER_FAILURE:
176 finish(r, event == AVAHI_BROWSER_NOT_FOUND ? AVAHI_RESOLVER_NOT_FOUND : AVAHI_RESOLVER_FAILURE);
181 AvahiSAddressResolver *avahi_s_address_resolver_new(
183 AvahiIfIndex interface,
184 AvahiProtocol protocol,
185 const AvahiAddress *address,
186 AvahiLookupFlags flags,
187 AvahiSAddressResolverCallback callback,
190 AvahiSAddressResolver *r;
198 assert(address->proto == AVAHI_PROTO_INET || address->proto == AVAHI_PROTO_INET6);
200 if (!AVAHI_IF_VALID(interface)) {
201 avahi_server_set_errno(server, AVAHI_ERR_INVALID_INTERFACE);
205 if (!AVAHI_VALID_FLAGS(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST)) {
206 avahi_server_set_errno(server, AVAHI_ERR_INVALID_FLAGS);
210 if (address->proto == AVAHI_PROTO_INET)
211 n = avahi_reverse_lookup_name_ipv4(&address->data.ipv4);
213 n = avahi_reverse_lookup_name_ipv6_arpa(&address->data.ipv6);
216 avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
220 k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR);
224 avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
228 if (!(r = avahi_new(AvahiSAddressResolver, 1))) {
229 avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
235 r->address = *address;
236 r->callback = callback;
237 r->userdata = userdata;
238 r->ptr_record = NULL;
239 r->interface = interface;
240 r->protocol = protocol;
242 r->retry_with_multicast = 0;
245 r->record_browser = NULL;
246 AVAHI_LLIST_PREPEND(AvahiSAddressResolver, resolver, server->address_resolvers, r);
248 r->time_event = NULL;
250 if (!(flags & (AVAHI_LOOKUP_USE_MULTICAST|AVAHI_LOOKUP_USE_WIDE_AREA))) {
252 if (!server->wide_area_lookup_engine || !avahi_wide_area_has_servers(server->wide_area_lookup_engine))
253 flags |= AVAHI_LOOKUP_USE_MULTICAST;
255 flags |= AVAHI_LOOKUP_USE_WIDE_AREA;
256 r->retry_with_multicast = 1;
260 r->record_browser = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, r);
262 if (!r->record_browser) {
263 avahi_s_address_resolver_free(r);
272 void avahi_s_address_resolver_free(AvahiSAddressResolver *r) {
275 AVAHI_LLIST_REMOVE(AvahiSAddressResolver, resolver, r->server->address_resolvers, r);
277 if (r->record_browser)
278 avahi_s_record_browser_free(r->record_browser);
281 avahi_time_event_free(r->time_event);
284 avahi_record_unref(r->ptr_record);
287 avahi_key_unref(r->key);