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 <avahi-common/timeval.h>
  27 #include <avahi-common/malloc.h>
  28
  29 #include "browse.h"
  30
  31 struct AvahiAddressResolver {
  32     AvahiServer *server;
  33     AvahiAddress address;
  34
  35     AvahiRecordBrowser *record_browser;
  36
  37     AvahiAddressResolverCallback callback;
  38     void* userdata;
  39
  40     AvahiTimeEvent *time_event;
  41
  42     AVAHI_LLIST_FIELDS(AvahiAddressResolver, resolver);
  43 };
  44
  45 static void finish(AvahiAddressResolver *r, AvahiIfIndex interface, AvahiProtocol protocol, AvahiResolverEvent event, AvahiRecord *record) {
  46     assert(r);
  47
  48     avahi_record_browser_free(r->record_browser);
  49     r->record_browser = NULL;
  50
  51     if (r->time_event) {
  52         avahi_time_event_free(r->time_event);
  53         r->time_event = NULL;
  54     }
  55
  56     r->callback(r, interface, protocol, event, &r->address, record ? record->data.ptr.name : NULL, r->userdata);
  57 }
  58
  59 static void record_browser_callback(AvahiRecordBrowser*rr, AvahiIfIndex interface, AvahiProtocol protocol, AvahiBrowserEvent event, AvahiRecord *record, void* userdata) {
  60     AvahiAddressResolver *r = userdata;
  61
  62     assert(rr);
  63     assert(record);
  64     assert(r);
  65
  66     if (!(event == AVAHI_BROWSER_NEW))
  67         return;
  68
  69     assert(record->key->type == AVAHI_DNS_TYPE_PTR);
  70
  71     finish(r, interface, protocol, AVAHI_RESOLVER_FOUND, record);
  72 }
  73
  74 static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
  75     AvahiAddressResolver *r = userdata;
  76
  77     assert(e);
  78     assert(r);
  79
  80     finish(r, -1, AVAHI_PROTO_UNSPEC, AVAHI_RESOLVER_TIMEOUT, NULL);
  81 }
  82
  83 AvahiAddressResolver *avahi_address_resolver_new(AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const AvahiAddress *address, AvahiAddressResolverCallback callback, void* userdata) {
  84     AvahiAddressResolver *r;
  85     AvahiKey *k;
  86     char *n;
  87     struct timeval tv;
  88
  89     assert(server);
  90     assert(address);
  91     assert(callback);
  92
  93     assert(address->family == AVAHI_PROTO_INET || address->family == AVAHI_PROTO_INET6);
  94
  95     if (address->family == AVAHI_PROTO_INET)
  96         n = avahi_reverse_lookup_name_ipv4(&address->data.ipv4);
  97     else
  98         n = avahi_reverse_lookup_name_ipv6_arpa(&address->data.ipv6);
  99
 100     if (!n) {
 101         avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
 102         return NULL;
 103     }
 104
 105     k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR);
 106     avahi_free(n);
 107
 108     if (!k) {
 109         avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
 110         return NULL;
 111     }
 112
 113     if (!(r = avahi_new(AvahiAddressResolver, 1))) {
 114         avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
 115         avahi_key_unref(k);
 116         return NULL;
 117     }
 118
 119     r->server = server;
 120     r->address = *address;
 121     r->callback = callback;
 122     r->userdata = userdata;
 123
 124     r->record_browser = NULL;
 125     AVAHI_LLIST_PREPEND(AvahiAddressResolver, resolver, server->address_resolvers, r);
 126
 127     avahi_elapse_time(&tv, 1000, 0);
 128     if (!(r->time_event = avahi_time_event_new(server->time_event_queue, &tv, time_event_callback, r))) {
 129         avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
 130         avahi_address_resolver_free(r);
 131         avahi_key_unref(k);
 132         return NULL;
 133     }
 134
 135     r->record_browser = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 136     avahi_key_unref(k);
 137
 138     if (!r->record_browser) {
 139         avahi_address_resolver_free(r);
 140         return NULL;
 141     }
 142
 143     return r;
 144 }
 145
 146 void avahi_address_resolver_free(AvahiAddressResolver *r) {
 147     assert(r);
 148
 149     AVAHI_LLIST_REMOVE(AvahiAddressResolver, resolver, r->server->address_resolvers, r);
 150
 151     if (r->record_browser)
 152         avahi_record_browser_free(r->record_browser);
 153
 154     if (r->time_event)
 155         avahi_time_event_free(r->time_event);
 156
 157     avahi_free(r);
 158 }