git.meshlink.io Git - catta/blob - avahi-core/resolve-service.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 <string.h>
  27
  28 #include "browse.h"
  29 #include "util.h"
  30
  31 struct AvahiServiceResolver {
  32     AvahiServer *server;
  33     gchar *service_name;
  34     gchar *service_type;
  35     gchar *domain_name;
  36     guchar address_protocol;
  37
  38     gint interface;
  39     guchar protocol;
  40
  41     AvahiRecordBrowser *record_browser_srv;
  42     AvahiRecordBrowser *record_browser_txt;
  43     AvahiRecordBrowser *record_browser_a;
  44     AvahiRecordBrowser *record_browser_aaaa;
  45
  46     AvahiRecord *srv_record, *txt_record, *address_record;
  47
  48     AvahiServiceResolverCallback callback;
  49     gpointer userdata;
  50
  51     AvahiTimeEvent *time_event;
  52
  53     AVAHI_LLIST_FIELDS(AvahiServiceResolver, resolver);
  54 };
  55
  56 static void finish(AvahiServiceResolver *r, AvahiResolverEvent event) {
  57     g_assert(r);
  58
  59     if (r->record_browser_a) {
  60         avahi_record_browser_free(r->record_browser_a);
  61         r->record_browser_a = NULL;
  62     }
  63
  64     if (r->record_browser_aaaa) {
  65         avahi_record_browser_free(r->record_browser_aaaa);
  66         r->record_browser_aaaa = NULL;
  67     }
  68
  69     if (r->record_browser_srv) {
  70         avahi_record_browser_free(r->record_browser_srv);
  71         r->record_browser_srv = NULL;
  72     }
  73
  74     if (r->record_browser_txt) {
  75         avahi_record_browser_free(r->record_browser_txt);
  76         r->record_browser_txt = NULL;
  77     }
  78
  79     avahi_time_event_queue_remove(r->server->time_event_queue, r->time_event);
  80     r->time_event = NULL;
  81
  82     if (event == AVAHI_RESOLVER_TIMEOUT)
  83         r->callback(r, r->interface, r->protocol, event, r->service_name, r->service_type, r->domain_name, NULL, NULL, 0, NULL, r->userdata);
  84     else {
  85         AvahiAddress a;
  86         gchar sn[256], st[256];
  87         size_t i;
  88
  89         g_assert(r->srv_record);
  90         g_assert(r->txt_record);
  91         g_assert(r->address_record);
  92
  93         switch (r->address_record->key->type) {
  94             case AVAHI_DNS_TYPE_A:
  95                 a.family = AF_INET;
  96                 a.data.ipv4 = r->address_record->data.a.address;
  97                 break;
  98
  99             case AVAHI_DNS_TYPE_AAAA:
 100                 a.family = AF_INET6;
 101                 a.data.ipv6 = r->address_record->data.aaaa.address;
 102                 break;
 103
 104             default:
 105                 g_assert(FALSE);
 106         }
 107
 108         snprintf(sn, sizeof(sn), r->service_name);
 109         snprintf(st, sizeof(st), r->service_type);
 110
 111         if ((i = strlen(sn)) > 0 && sn[i-1] == '.')
 112             sn[i-1] = 0;
 113
 114         if ((i = strlen(st)) > 0 && st[i-1] == '.')
 115             st[i-1] = 0;
 116
 117         r->callback(r, r->interface, r->protocol, event, sn, st, r->domain_name, r->srv_record->data.srv.name, &a, r->srv_record->data.srv.port, r->txt_record->data.txt.string_list, r->userdata);
 118
 119     }
 120 }
 121
 122 static void record_browser_callback(AvahiRecordBrowser*rr, gint interface, guchar protocol, AvahiBrowserEvent event, AvahiRecord *record, gpointer userdata) {
 123     AvahiServiceResolver *r = userdata;
 124
 125     g_assert(rr);
 126     g_assert(record);
 127     g_assert(r);
 128
 129     if (!(event == AVAHI_BROWSER_NEW))
 130         return;
 131
 132     if (r->interface > 0 && interface != r->interface)
 133         return;
 134
 135     if (r->protocol != AF_UNSPEC && protocol != r->protocol)
 136         return;
 137
 138     if (r->interface <= 0)
 139         r->interface = interface;
 140
 141     if (r->protocol == AF_UNSPEC)
 142         r->protocol = protocol;
 143
 144     switch (record->key->type) {
 145         case AVAHI_DNS_TYPE_SRV:
 146             if (!r->srv_record) {
 147                 r->srv_record = avahi_record_ref(record);
 148
 149                 g_assert(!r->record_browser_a && !r->record_browser_aaaa);
 150
 151                 if (r->address_protocol == AF_INET || r->address_protocol == AF_UNSPEC) {
 152                     AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
 153                     r->record_browser_a = avahi_record_browser_new(r->server, r->interface, r->protocol, k, record_browser_callback, r);
 154                     avahi_key_unref(k);
 155                 }
 156
 157                 if (r->address_protocol == AF_INET6 || r->address_protocol == AF_UNSPEC) {
 158                     AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
 159                     r->record_browser_aaaa = avahi_record_browser_new(r->server, r->interface, r->protocol, k, record_browser_callback, r);
 160                     avahi_key_unref(k);
 161                 }
 162             }
 163             break;
 164
 165         case AVAHI_DNS_TYPE_TXT:
 166             if (!r->txt_record)
 167                 r->txt_record = avahi_record_ref(record);
 168             break;
 169
 170         case AVAHI_DNS_TYPE_A:
 171         case AVAHI_DNS_TYPE_AAAA:
 172             if (!r->address_record)
 173                 r->address_record = avahi_record_ref(record);
 174             break;
 175
 176         default:
 177             g_assert(FALSE);
 178     }
 179
 180     if (r->txt_record && r->srv_record && r->address_record)
 181         finish(r, AVAHI_RESOLVER_FOUND);
 182 }
 183
 184 static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
 185     AvahiServiceResolver *r = userdata;
 186
 187     g_assert(e);
 188     g_assert(r);
 189
 190     finish(r, AVAHI_RESOLVER_TIMEOUT);
 191 }
 192
 193 AvahiServiceResolver *avahi_service_resolver_new(AvahiServer *server, gint interface, guchar protocol, const gchar *name, const gchar *type, const gchar *domain, guchar aprotocol, AvahiServiceResolverCallback callback, gpointer userdata) {
 194     AvahiServiceResolver *r;
 195     AvahiKey *k;
 196     GTimeVal tv;
 197     gchar t[256], *n;
 198     size_t l;
 199
 200     g_assert(server);
 201     g_assert(name);
 202     g_assert(type);
 203     g_assert(callback);
 204
 205     g_assert(aprotocol == AF_UNSPEC || aprotocol == AF_INET || aprotocol == AF_INET6);
 206
 207     r = g_new(AvahiServiceResolver, 1);
 208     r->server = server;
 209     r->service_name = avahi_normalize_name(name);
 210     r->service_type = avahi_normalize_name(type);
 211     r->domain_name = avahi_normalize_name(domain);
 212     r->callback = callback;
 213     r->userdata = userdata;
 214     r->address_protocol = aprotocol;
 215     r->srv_record = r->txt_record = r->address_record = NULL;
 216     r->interface = interface;
 217     r->protocol = protocol;
 218
 219     n = t;
 220     l = sizeof(t);
 221     avahi_escape_label((guint8*) name, strlen(name), &n, &l);
 222     snprintf(n, l, ".%s%s", r->service_type, r->domain_name);
 223
 224     avahi_elapse_time(&tv, 1000, 0);
 225     r->time_event = avahi_time_event_queue_add(server->time_event_queue, &tv, time_event_callback, r);
 226
 227     AVAHI_LLIST_PREPEND(AvahiServiceResolver, resolver, server->service_resolvers, r);
 228
 229     r->record_browser_a = r->record_browser_aaaa = r->record_browser_srv = r->record_browser_txt = NULL;
 230
 231     k = avahi_key_new(t, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV);
 232     r->record_browser_srv = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 233     avahi_key_unref(k);
 234
 235     k = avahi_key_new(t, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT);
 236     r->record_browser_txt = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 237     avahi_key_unref(k);
 238
 239     return r;
 240 }
 241
 242 void avahi_service_resolver_free(AvahiServiceResolver *r) {
 243     g_assert(r);
 244
 245     AVAHI_LLIST_REMOVE(AvahiServiceResolver, resolver, r->server->service_resolvers, r);
 246
 247     if (r->record_browser_srv)
 248         avahi_record_browser_free(r->record_browser_srv);
 249     if (r->record_browser_txt)
 250         avahi_record_browser_free(r->record_browser_txt);
 251     if (r->record_browser_a)
 252         avahi_record_browser_free(r->record_browser_a);
 253     if (r->record_browser_aaaa)
 254         avahi_record_browser_free(r->record_browser_aaaa);
 255
 256     if (r->srv_record)
 257         avahi_record_unref(r->srv_record);
 258     if (r->txt_record)
 259         avahi_record_unref(r->txt_record);
 260     if (r->address_record)
 261         avahi_record_unref(r->address_record);
 262
 263     g_free(r->service_name);
 264     g_free(r->service_type);
 265     g_free(r->domain_name);
 266     g_free(r);
 267 }