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 <avahi-common/malloc.h>
  29
  30 #include "browse.h"
  31 #include "log.h"
  32
  33 struct AvahiHostNameResolver {
  34     AvahiServer *server;
  35     char *host_name;
  36
  37     AvahiRecordBrowser *record_browser_a;
  38     AvahiRecordBrowser *record_browser_aaaa;
  39
  40     AvahiHostNameResolverCallback callback;
  41     void* userdata;
  42
  43     AvahiTimeEvent *time_event;
  44
  45     AVAHI_LLIST_FIELDS(AvahiHostNameResolver, resolver);
  46 };
  47
  48 static void finish(AvahiHostNameResolver *r, AvahiIfIndex interface, AvahiProtocol protocol, AvahiResolverEvent event, AvahiRecord *record) {
  49     AvahiAddress a;
  50
  51     assert(r);
  52
  53     if (r->record_browser_a) {
  54         avahi_record_browser_free(r->record_browser_a);
  55         r->record_browser_a = NULL;
  56     }
  57
  58     if (r->record_browser_aaaa) {
  59         avahi_record_browser_free(r->record_browser_aaaa);
  60         r->record_browser_aaaa = NULL;
  61     }
  62
  63     if (r->time_event) {
  64         avahi_time_event_free(r->time_event);
  65         r->time_event = NULL;
  66     }
  67
  68     if (record) {
  69         switch (record->key->type) {
  70             case AVAHI_DNS_TYPE_A:
  71                 a.family = AVAHI_PROTO_INET;
  72                 a.data.ipv4 = record->data.a.address;
  73                 break;
  74
  75             case AVAHI_DNS_TYPE_AAAA:
  76                 a.family = AVAHI_PROTO_INET6;
  77                 a.data.ipv6 = record->data.aaaa.address;
  78                 break;
  79
  80             default:
  81                 assert(0);
  82         }
  83     }
  84
  85     r->callback(r, interface, protocol, event, record ? record->key->name : r->host_name, record ? &a : NULL, r->userdata);
  86 }
  87
  88 static void record_browser_callback(AvahiRecordBrowser*rr, AvahiIfIndex interface, AvahiProtocol protocol, AvahiBrowserEvent event, AvahiRecord *record, void* userdata) {
  89     AvahiHostNameResolver *r = userdata;
  90
  91     assert(rr);
  92     assert(record);
  93     assert(r);
  94
  95     if (!(event == AVAHI_BROWSER_NEW))
  96         return;
  97
  98     assert(record->key->type == AVAHI_DNS_TYPE_A || record->key->type == AVAHI_DNS_TYPE_AAAA);
  99     finish(r, interface, protocol, AVAHI_RESOLVER_FOUND, record);
 100 }
 101
 102 static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
 103     AvahiHostNameResolver *r = userdata;
 104
 105     assert(e);
 106     assert(r);
 107
 108     finish(r, -1, AVAHI_PROTO_UNSPEC, AVAHI_RESOLVER_TIMEOUT, NULL);
 109 }
 110
 111 AvahiHostNameResolver *avahi_host_name_resolver_new(AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const char *host_name, AvahiProtocol aprotocol, AvahiHostNameResolverCallback callback, void* userdata) {
 112     AvahiHostNameResolver *r;
 113     AvahiKey *k;
 114     struct timeval tv;
 115
 116     assert(server);
 117     assert(host_name);
 118     assert(callback);
 119
 120     assert(aprotocol == AVAHI_PROTO_UNSPEC || aprotocol == AVAHI_PROTO_INET || aprotocol == AVAHI_PROTO_INET6);
 121
 122     if (!avahi_is_valid_domain_name(host_name)) {
 123         avahi_server_set_errno(server, AVAHI_ERR_INVALID_HOST_NAME);
 124         return NULL;
 125     }
 126
 127     if (!(r = avahi_new(AvahiHostNameResolver, 1))) {
 128         avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
 129         return NULL;
 130     }
 131
 132     r->server = server;
 133     r->host_name = avahi_normalize_name(host_name);
 134     r->callback = callback;
 135     r->userdata = userdata;
 136
 137     r->record_browser_a = r->record_browser_aaaa = NULL;
 138
 139     avahi_elapse_time(&tv, 1000, 0);
 140     r->time_event = avahi_time_event_new(server->time_event_queue, &tv, time_event_callback, r);
 141
 142     AVAHI_LLIST_PREPEND(AvahiHostNameResolver, resolver, server->host_name_resolvers, r);
 143
 144     r->record_browser_aaaa = r->record_browser_a = NULL;
 145
 146     if (aprotocol == AVAHI_PROTO_INET || aprotocol == AVAHI_PROTO_UNSPEC) {
 147         k = avahi_key_new(host_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
 148         r->record_browser_a = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 149         avahi_key_unref(k);
 150
 151         if (!r->record_browser_a)
 152             goto fail;
 153     }
 154
 155     if (aprotocol == AVAHI_PROTO_INET6 || aprotocol == AVAHI_PROTO_UNSPEC) {
 156         k = avahi_key_new(host_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
 157         r->record_browser_aaaa = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 158         avahi_key_unref(k);
 159
 160         if (!r->record_browser_aaaa)
 161             goto fail;
 162     }
 163
 164     assert(r->record_browser_aaaa || r->record_browser_a);
 165
 166     return r;
 167
 168 fail:
 169     avahi_host_name_resolver_free(r);
 170     return NULL;
 171 }
 172
 173 void avahi_host_name_resolver_free(AvahiHostNameResolver *r) {
 174     assert(r);
 175
 176     AVAHI_LLIST_REMOVE(AvahiHostNameResolver, resolver, r->server->host_name_resolvers, r);
 177
 178     if (r->record_browser_a)
 179         avahi_record_browser_free(r->record_browser_a);
 180
 181     if (r->record_browser_aaaa)
 182         avahi_record_browser_free(r->record_browser_aaaa);
 183
 184     if (r->time_event)
 185         avahi_time_event_free(r->time_event);
 186
 187     avahi_free(r->host_name);
 188     avahi_free(r);
 189 }