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