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 1000
34 struct AvahiSAddressResolver {
38 AvahiSRecordBrowser *record_browser;
40 AvahiSAddressResolverCallback callback;
43 AvahiRecord *ptr_record;
44 AvahiIfIndex interface;
45 AvahiProtocol protocol;
47 AvahiTimeEvent *time_event;
49 AVAHI_LLIST_FIELDS(AvahiSAddressResolver, resolver);
52 static void finish(AvahiSAddressResolver *r, AvahiResolverEvent event) {
56 avahi_time_event_free(r->time_event);
60 if (event == AVAHI_RESOLVER_TIMEOUT)
61 r->callback(r, r->interface, r->protocol, AVAHI_RESOLVER_TIMEOUT, &r->address, NULL, r->userdata);
64 assert(event == AVAHI_RESOLVER_FOUND);
65 assert(r->ptr_record);
67 r->callback(r, r->interface, r->protocol, AVAHI_RESOLVER_FOUND, &r->address, r->ptr_record->data.ptr.name, r->userdata);
71 static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
72 AvahiSAddressResolver *r = userdata;
77 finish(r, AVAHI_RESOLVER_TIMEOUT);
80 static void start_timeout(AvahiSAddressResolver *r) {
87 avahi_elapse_time(&tv, TIMEOUT_MSEC, 0);
88 r->time_event = avahi_time_event_new(r->server->time_event_queue, &tv, time_event_callback, r);
91 static void record_browser_callback(AvahiSRecordBrowser*rr, AvahiIfIndex interface, AvahiProtocol protocol, AvahiBrowserEvent event, AvahiRecord *record, void* userdata) {
92 AvahiSAddressResolver *r = userdata;
98 assert(record->key->type == AVAHI_DNS_TYPE_PTR);
100 if (event == AVAHI_BROWSER_NEW) {
102 if (r->interface > 0 && interface != r->interface)
105 if (r->protocol != AVAHI_PROTO_UNSPEC && protocol != r->protocol)
108 if (r->interface <= 0)
109 r->interface = interface;
111 if (r->protocol == AVAHI_PROTO_UNSPEC)
112 r->protocol = protocol;
114 if (!r->ptr_record) {
115 r->ptr_record = avahi_record_ref(record);
117 finish(r, AVAHI_RESOLVER_FOUND);
122 assert(event == AVAHI_BROWSER_REMOVE);
124 if (r->ptr_record && avahi_record_equal_no_ttl(record, r->ptr_record)) {
125 avahi_record_unref(r->ptr_record);
126 r->ptr_record = NULL;
128 /** Look for a replacement */
129 avahi_s_record_browser_restart(r->record_browser);
135 AvahiSAddressResolver *avahi_s_address_resolver_new(AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const AvahiAddress *address, AvahiSAddressResolverCallback callback, void* userdata) {
136 AvahiSAddressResolver *r;
144 assert(address->family == AVAHI_PROTO_INET || address->family == AVAHI_PROTO_INET6);
146 if (address->family == AVAHI_PROTO_INET)
147 n = avahi_reverse_lookup_name_ipv4(&address->data.ipv4);
149 n = avahi_reverse_lookup_name_ipv6_arpa(&address->data.ipv6);
152 avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
156 k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR);
160 avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
164 if (!(r = avahi_new(AvahiSAddressResolver, 1))) {
165 avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
171 r->address = *address;
172 r->callback = callback;
173 r->userdata = userdata;
174 r->ptr_record = NULL;
175 r->interface = interface;
176 r->protocol = protocol;
178 r->record_browser = NULL;
179 AVAHI_LLIST_PREPEND(AvahiSAddressResolver, resolver, server->address_resolvers, r);
181 r->time_event = NULL;
184 r->record_browser = avahi_s_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
187 if (!r->record_browser) {
188 avahi_s_address_resolver_free(r);
195 void avahi_s_address_resolver_free(AvahiSAddressResolver *r) {
198 AVAHI_LLIST_REMOVE(AvahiSAddressResolver, resolver, r->server->address_resolvers, r);
200 if (r->record_browser)
201 avahi_s_record_browser_free(r->record_browser);
204 avahi_time_event_free(r->time_event);
207 avahi_record_unref(r->ptr_record);