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 #include <avahi-common/error.h>
  30
  31 #include "browse.h"
  32 #include "log.h"
  33
  34 struct AvahiSHostNameResolver {
  35     AvahiServer *server;
  36     char *host_name;
  37
  38     AvahiSRecordBrowser *record_browser_a;
  39     AvahiSRecordBrowser *record_browser_aaaa;
  40
  41     AvahiSHostNameResolverCallback callback;
  42     void* userdata;
  43
  44     AvahiTimeEvent *time_event;
  45
  46     AVAHI_LLIST_FIELDS(AvahiSHostNameResolver, resolver);
  47 };
  48
  49 static void finish(AvahiSHostNameResolver *r, AvahiIfIndex interface, AvahiProtocol protocol, AvahiResolverEvent event, AvahiRecord *record) {
  50     AvahiAddress a;
  51
  52     assert(r);
  53
  54     if (r->record_browser_a) {
  55         avahi_s_record_browser_free(r->record_browser_a);
  56         r->record_browser_a = NULL;
  57     }
  58
  59     if (r->record_browser_aaaa) {
  60         avahi_s_record_browser_free(r->record_browser_aaaa);
  61         r->record_browser_aaaa = NULL;
  62     }
  63
  64     if (r->time_event) {
  65         avahi_time_event_free(r->time_event);
  66         r->time_event = NULL;
  67     }
  68
  69     if (record) {
  70         switch (record->key->type) {
  71             case AVAHI_DNS_TYPE_A:
  72                 a.family = AVAHI_PROTO_INET;
  73                 a.data.ipv4 = record->data.a.address;
  74                 break;
  75
  76             case AVAHI_DNS_TYPE_AAAA:
  77                 a.family = AVAHI_PROTO_INET6;
  78                 a.data.ipv6 = record->data.aaaa.address;
  79                 break;
  80
  81             default:
  82                 assert(0);
  83         }
  84     }
  85
  86     r->callback(r, interface, protocol, event, record ? record->key->name : r->host_name, record ? &a : NULL, r->userdata);
  87 }
  88
  89 static void record_browser_callback(AvahiSRecordBrowser*rr, AvahiIfIndex interface, AvahiProtocol protocol, AvahiBrowserEvent event, AvahiRecord *record, void* userdata) {
  90     AvahiSHostNameResolver *r = userdata;
  91
  92     assert(rr);
  93     assert(record);
  94     assert(r);
  95
  96     if (!(event == AVAHI_BROWSER_NEW))
  97         return;
  98
  99     assert(record->key->type == AVAHI_DNS_TYPE_A || record->key->type == AVAHI_DNS_TYPE_AAAA);
 100     finish(r, interface, protocol, AVAHI_RESOLVER_FOUND, record);
 101 }
 102
 103 static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
 104     AvahiSHostNameResolver *r = userdata;
 105
 106     assert(e);
 107     assert(r);
 108
 109     finish(r, -1, AVAHI_PROTO_UNSPEC, AVAHI_RESOLVER_TIMEOUT, NULL);
 110 }
 111
 112 AvahiSHostNameResolver *avahi_s_host_name_resolver_new(AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const char *host_name, AvahiProtocol aprotocol, AvahiSHostNameResolverCallback callback, void* userdata) {
 113     AvahiSHostNameResolver *r;
 114     AvahiKey *k;
 115     struct timeval tv;
 116
 117     assert(server);
 118     assert(host_name);
 119     assert(callback);
 120
 121     assert(aprotocol == AVAHI_PROTO_UNSPEC || aprotocol == AVAHI_PROTO_INET || aprotocol == AVAHI_PROTO_INET6);
 122
 123     if (!avahi_is_valid_domain_name(host_name)) {
 124         avahi_server_set_errno(server, AVAHI_ERR_INVALID_HOST_NAME);
 125         return NULL;
 126     }
 127
 128     if (!(r = avahi_new(AvahiSHostNameResolver, 1))) {
 129         avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
 130         return NULL;
 131     }
 132
 133     r->server = server;
 134     r->host_name = avahi_normalize_name(host_name);
 135     r->callback = callback;
 136     r->userdata = userdata;
 137
 138     r->record_browser_a = r->record_browser_aaaa = NULL;
 139
 140     avahi_elapse_time(&tv, 1000, 0);
 141     r->time_event = avahi_time_event_new(server->time_event_queue, &tv, time_event_callback, r);
 142
 143     AVAHI_LLIST_PREPEND(AvahiSHostNameResolver, resolver, server->host_name_resolvers, r);
 144
 145     r->record_browser_aaaa = r->record_browser_a = NULL;
 146
 147     if (aprotocol == AVAHI_PROTO_INET || aprotocol == AVAHI_PROTO_UNSPEC) {
 148         k = avahi_key_new(host_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
 149         r->record_browser_a = avahi_s_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 150         avahi_key_unref(k);
 151
 152         if (!r->record_browser_a)
 153             goto fail;
 154     }
 155
 156     if (aprotocol == AVAHI_PROTO_INET6 || aprotocol == AVAHI_PROTO_UNSPEC) {
 157         k = avahi_key_new(host_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
 158         r->record_browser_aaaa = avahi_s_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 159         avahi_key_unref(k);
 160
 161         if (!r->record_browser_aaaa)
 162             goto fail;
 163     }
 164
 165     assert(r->record_browser_aaaa || r->record_browser_a);
 166
 167     return r;
 168
 169 fail:
 170     avahi_s_host_name_resolver_free(r);
 171     return NULL;
 172 }
 173
 174 void avahi_s_host_name_resolver_free(AvahiSHostNameResolver *r) {
 175     assert(r);
 176
 177     AVAHI_LLIST_REMOVE(AvahiSHostNameResolver, resolver, r->server->host_name_resolvers, r);
 178
 179     if (r->record_browser_a)
 180         avahi_s_record_browser_free(r->record_browser_a);
 181
 182     if (r->record_browser_aaaa)
 183         avahi_s_record_browser_free(r->record_browser_aaaa);
 184
 185     if (r->time_event)
 186         avahi_time_event_free(r->time_event);
 187
 188     avahi_free(r->host_name);
 189     avahi_free(r);
 190 }