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, gint interface, guchar 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     avahi_time_event_queue_remove(r->server->time_event_queue, r->time_event);
  60     r->time_event = NULL;
  61
  62     if (record) {
  63         switch (record->key->type) {
  64             case AVAHI_DNS_TYPE_A:
  65                 a.family = AF_INET;
  66                 a.data.ipv4 = record->data.a.address;
  67                 break;
  68
  69             case AVAHI_DNS_TYPE_AAAA:
  70                 a.family = AF_INET6;
  71                 a.data.ipv6 = record->data.aaaa.address;
  72                 break;
  73
  74             default:
  75                 g_assert(FALSE);
  76         }
  77     }
  78
  79     r->callback(r, interface, protocol, event, record ? record->key->name : r->host_name, record ? &a : NULL, r->userdata);
  80 }
  81
  82 static void record_browser_callback(AvahiRecordBrowser*rr, gint interface, guchar protocol, AvahiBrowserEvent event, AvahiRecord *record, gpointer userdata) {
  83     AvahiHostNameResolver *r = userdata;
  84
  85     g_assert(rr);
  86     g_assert(record);
  87     g_assert(r);
  88
  89     if (!(event == AVAHI_BROWSER_NEW))
  90         return;
  91
  92     g_assert(record->key->type == AVAHI_DNS_TYPE_A || record->key->type == AVAHI_DNS_TYPE_AAAA);
  93     finish(r, interface, protocol, AVAHI_RESOLVER_FOUND, record);
  94 }
  95
  96 static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
  97     AvahiHostNameResolver *r = userdata;
  98
  99     g_assert(e);
 100     g_assert(r);
 101
 102     finish(r, -1, AF_UNSPEC, AVAHI_RESOLVER_TIMEOUT, NULL);
 103 }
 104
 105 AvahiHostNameResolver *avahi_host_name_resolver_new(AvahiServer *server, gint interface, guchar protocol, const gchar *host_name, guchar aprotocol, AvahiHostNameResolverCallback callback, gpointer userdata) {
 106     AvahiHostNameResolver *r;
 107     AvahiKey *k;
 108     GTimeVal tv;
 109
 110     g_assert(server);
 111     g_assert(host_name);
 112     g_assert(callback);
 113
 114     g_assert(aprotocol == AF_UNSPEC || aprotocol == AF_INET || aprotocol == AF_INET6);
 115
 116     r = g_new(AvahiHostNameResolver, 1);
 117     r->server = server;
 118     r->host_name = avahi_normalize_name(host_name);
 119     r->callback = callback;
 120     r->userdata = userdata;
 121
 122     r->record_browser_a = r->record_browser_aaaa = NULL;
 123
 124     avahi_elapse_time(&tv, 1000, 0);
 125     r->time_event = avahi_time_event_queue_add(server->time_event_queue, &tv, time_event_callback, r);
 126
 127     AVAHI_LLIST_PREPEND(AvahiHostNameResolver, resolver, server->host_name_resolvers, r);
 128
 129     if (aprotocol == AF_INET || aprotocol == AF_UNSPEC) {
 130         k = avahi_key_new(host_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
 131         r->record_browser_a = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 132         avahi_key_unref(k);
 133     }
 134
 135     if (aprotocol == AF_INET6 || aprotocol == AF_UNSPEC) {
 136         k = avahi_key_new(host_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
 137         r->record_browser_aaaa = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 138         avahi_key_unref(k);
 139     }
 140
 141     return r;
 142 }
 143
 144 void avahi_host_name_resolver_free(AvahiHostNameResolver *r) {
 145     g_assert(r);
 146
 147     AVAHI_LLIST_REMOVE(AvahiHostNameResolver, resolver, r->server->host_name_resolvers, r);
 148
 149     if (r->record_browser_a)
 150         avahi_record_browser_free(r->record_browser_a);
 151     if (r->record_browser_aaaa)
 152         avahi_record_browser_free(r->record_browser_aaaa);
 153
 154     g_free(r->host_name);
 155     g_free(r);
 156 }