git.meshlink.io Git - catta/blob - avahi-core/resolve-address.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 AvahiAddressResolver {
  30     AvahiServer *server;
  31     AvahiAddress address;
  32
  33     AvahiRecordBrowser *record_browser;
  34
  35     AvahiAddressResolverCallback callback;
  36     gpointer userdata;
  37
  38     AvahiTimeEvent *time_event;
  39
  40     AVAHI_LLIST_FIELDS(AvahiAddressResolver, resolver);
  41 };
  42
  43 static void finish(AvahiAddressResolver *r, AvahiIfIndex interface, AvahiProtocol protocol, AvahiResolverEvent event, AvahiRecord *record) {
  44     g_assert(r);
  45
  46     avahi_record_browser_free(r->record_browser);
  47     r->record_browser = NULL;
  48
  49     if (r->time_event) {
  50         avahi_time_event_queue_remove(r->server->time_event_queue, r->time_event);
  51         r->time_event = NULL;
  52     }
  53
  54     r->callback(r, interface, protocol, event, &r->address, record ? record->data.ptr.name : NULL, r->userdata);
  55 }
  56
  57 static void record_browser_callback(AvahiRecordBrowser*rr, AvahiIfIndex interface, AvahiProtocol protocol, AvahiBrowserEvent event, AvahiRecord *record, gpointer userdata) {
  58     AvahiAddressResolver *r = userdata;
  59
  60     g_assert(rr);
  61     g_assert(record);
  62     g_assert(r);
  63
  64     if (!(event == AVAHI_BROWSER_NEW))
  65         return;
  66
  67     g_assert(record->key->type == AVAHI_DNS_TYPE_PTR);
  68
  69     finish(r, interface, protocol, AVAHI_RESOLVER_FOUND, record);
  70 }
  71
  72 static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
  73     AvahiAddressResolver *r = userdata;
  74
  75     g_assert(e);
  76     g_assert(r);
  77
  78     finish(r, -1, AVAHI_PROTO_UNSPEC, AVAHI_RESOLVER_TIMEOUT, NULL);
  79 }
  80
  81 AvahiAddressResolver *avahi_address_resolver_new(AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const AvahiAddress *address, AvahiAddressResolverCallback callback, gpointer userdata) {
  82     AvahiAddressResolver *r;
  83     AvahiKey *k;
  84     gchar *n;
  85     struct timeval tv;
  86
  87     g_assert(server);
  88     g_assert(address);
  89     g_assert(callback);
  90
  91     g_assert(address->family == AVAHI_PROTO_INET || address->family == AVAHI_PROTO_INET6);
  92
  93     r = g_new(AvahiAddressResolver, 1);
  94     r->server = server;
  95     r->address = *address;
  96     r->callback = callback;
  97     r->userdata = userdata;
  98
  99     avahi_elapse_time(&tv, 1000, 0);
 100     r->time_event = avahi_time_event_queue_add(server->time_event_queue, &tv, time_event_callback, r);
 101
 102     AVAHI_LLIST_PREPEND(AvahiAddressResolver, resolver, server->address_resolvers, r);
 103
 104     if (address->family == AVAHI_PROTO_INET)
 105         n = avahi_reverse_lookup_name_ipv4(&address->data.ipv4);
 106     else
 107         n = avahi_reverse_lookup_name_ipv6_arpa(&address->data.ipv6);
 108
 109     k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR);
 110     g_free(n);
 111
 112     r->record_browser = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 113     avahi_key_unref(k);
 114
 115     if (!r->record_browser) {
 116         avahi_address_resolver_free(r);
 117         return NULL;
 118     }
 119
 120     return r;
 121 }
 122
 123 void avahi_address_resolver_free(AvahiAddressResolver *r) {
 124     g_assert(r);
 125
 126     AVAHI_LLIST_REMOVE(AvahiAddressResolver, resolver, r->server->address_resolvers, r);
 127
 128     if (r->record_browser)
 129         avahi_record_browser_free(r->record_browser);
 130
 131     if (r->time_event)
 132         avahi_time_event_queue_remove(r->server->time_event_queue, r->time_event);
 133
 134     g_free(r);
 135 }