git.meshlink.io Git - catta/blob - avahi-core/resolve-host-name.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of avahi.
   5
   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.
  10
  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.
  15
  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
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <avahi-common/domain.h>
  27 #include <avahi-common/timeval.h>
  28 #include "browse.h"
  29
  30 struct AvahiHostNameResolver {
  31     AvahiServer *server;
  32     gchar *host_name;
  33
  34     AvahiRecordBrowser *record_browser_a;
  35     AvahiRecordBrowser *record_browser_aaaa;
  36
  37     AvahiHostNameResolverCallback callback;
  38     gpointer userdata;
  39
  40     AvahiTimeEvent *time_event;
  41
  42     AVAHI_LLIST_FIELDS(AvahiHostNameResolver, resolver);
  43 };
  44
  45 static void finish(AvahiHostNameResolver *r, AvahiIfIndex interface, AvahiProtocol protocol, AvahiResolverEvent event, AvahiRecord *record) {
  46     AvahiAddress a;
  47
  48     g_assert(r);
  49
  50     if (r->record_browser_a) {
  51         avahi_record_browser_free(r->record_browser_a);
  52         r->record_browser_a = NULL;
  53     }
  54
  55     if (r->record_browser_aaaa) {
  56         avahi_record_browser_free(r->record_browser_aaaa);
  57         r->record_browser_aaaa = NULL;
  58     }
  59
  60     if (r->time_event) {
  61         avahi_time_event_queue_remove(r->server->time_event_queue, r->time_event);
  62         r->time_event = NULL;
  63     }
  64
  65     if (record) {
  66         switch (record->key->type) {
  67             case AVAHI_DNS_TYPE_A:
  68                 a.family = AVAHI_PROTO_INET;
  69                 a.data.ipv4 = record->data.a.address;
  70                 break;
  71
  72             case AVAHI_DNS_TYPE_AAAA:
  73                 a.family = AVAHI_PROTO_INET6;
  74                 a.data.ipv6 = record->data.aaaa.address;
  75                 break;
  76
  77             default:
  78                 g_assert(FALSE);
  79         }
  80     }
  81
  82     r->callback(r, interface, protocol, event, record ? record->key->name : r->host_name, record ? &a : NULL, r->userdata);
  83 }
  84
  85 static void record_browser_callback(AvahiRecordBrowser*rr, AvahiIfIndex interface, AvahiProtocol protocol, AvahiBrowserEvent event, AvahiRecord *record, gpointer userdata) {
  86     AvahiHostNameResolver *r = userdata;
  87
  88     g_assert(rr);
  89     g_assert(record);
  90     g_assert(r);
  91
  92     if (!(event == AVAHI_BROWSER_NEW))
  93         return;
  94
  95     g_assert(record->key->type == AVAHI_DNS_TYPE_A || record->key->type == AVAHI_DNS_TYPE_AAAA);
  96     finish(r, interface, protocol, AVAHI_RESOLVER_FOUND, record);
  97 }
  98
  99 static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
 100     AvahiHostNameResolver *r = userdata;
 101
 102     g_assert(e);
 103     g_assert(r);
 104
 105     finish(r, -1, AVAHI_PROTO_UNSPEC, AVAHI_RESOLVER_TIMEOUT, NULL);
 106 }
 107
 108 AvahiHostNameResolver *avahi_host_name_resolver_new(AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const gchar *host_name, guchar aprotocol, AvahiHostNameResolverCallback callback, gpointer userdata) {
 109     AvahiHostNameResolver *r;
 110     AvahiKey *k;
 111     struct timeval tv;
 112
 113     g_assert(server);
 114     g_assert(host_name);
 115     g_assert(callback);
 116
 117     g_assert(aprotocol == AVAHI_PROTO_UNSPEC || aprotocol == AVAHI_PROTO_INET || aprotocol == AVAHI_PROTO_INET6);
 118
 119     if (!avahi_is_valid_domain_name(host_name)) {
 120         avahi_server_set_errno(server, AVAHI_ERR_INVALID_HOST_NAME);
 121         return NULL;
 122     }
 123
 124     r = g_new(AvahiHostNameResolver, 1);
 125     r->server = server;
 126     r->host_name = avahi_normalize_name(host_name);
 127     r->callback = callback;
 128     r->userdata = userdata;
 129
 130     r->record_browser_a = r->record_browser_aaaa = NULL;
 131
 132     avahi_elapse_time(&tv, 1000, 0);
 133     r->time_event = avahi_time_event_queue_add(server->time_event_queue, &tv, time_event_callback, r);
 134
 135     AVAHI_LLIST_PREPEND(AvahiHostNameResolver, resolver, server->host_name_resolvers, r);
 136
 137     r->record_browser_aaaa = r->record_browser_a = NULL;
 138
 139     if (aprotocol == AVAHI_PROTO_INET || aprotocol == AVAHI_PROTO_UNSPEC) {
 140         k = avahi_key_new(host_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
 141         r->record_browser_a = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 142         avahi_key_unref(k);
 143
 144         if (!r->record_browser_a)
 145             goto fail;
 146     }
 147
 148     if (aprotocol == AVAHI_PROTO_INET6 || aprotocol == AVAHI_PROTO_UNSPEC) {
 149         k = avahi_key_new(host_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
 150         r->record_browser_aaaa = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 151         avahi_key_unref(k);
 152
 153         if (!r->record_browser_aaaa)
 154             goto fail;
 155     }
 156
 157     g_assert(r->record_browser_aaaa || r->record_browser_a);
 158
 159     return r;
 160
 161 fail:
 162     avahi_host_name_resolver_free(r);
 163     return NULL;
 164 }
 165
 166 void avahi_host_name_resolver_free(AvahiHostNameResolver *r) {
 167     g_assert(r);
 168
 169     AVAHI_LLIST_REMOVE(AvahiHostNameResolver, resolver, r->server->host_name_resolvers, r);
 170
 171     if (r->record_browser_a)
 172         avahi_record_browser_free(r->record_browser_a);
 173
 174     if (r->record_browser_aaaa)
 175         avahi_record_browser_free(r->record_browser_aaaa);
 176
 177     if (r->time_event)
 178         avahi_time_event_queue_remove(r->server->time_event_queue, r->time_event);
 179
 180     g_free(r->host_name);
 181     g_free(r);
 182 }