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     AvahiProtocol address_protocol;
  37
  38     AvahiIfIndex interface;
  39     AvahiProtocol 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     if (r->time_event) {
  80         avahi_time_event_queue_remove(r->server->time_event_queue, r->time_event);
  81         r->time_event = NULL;
  82     }
  83
  84     if (event == AVAHI_RESOLVER_TIMEOUT)
  85         r->callback(r, r->interface, r->protocol, event, r->service_name, r->service_type, r->domain_name, NULL, NULL, 0, NULL, r->userdata);
  86     else {
  87         AvahiAddress a;
  88         gchar sn[256], st[256];
  89         size_t i;
  90
  91         g_assert(r->srv_record);
  92         g_assert(r->txt_record);
  93         g_assert(r->address_record);
  94
  95         switch (r->address_record->key->type) {
  96             case AVAHI_DNS_TYPE_A:
  97                 a.family = AVAHI_PROTO_INET;
  98                 a.data.ipv4 = r->address_record->data.a.address;
  99                 break;
 100
 101             case AVAHI_DNS_TYPE_AAAA:
 102                 a.family = AVAHI_PROTO_INET6;
 103                 a.data.ipv6 = r->address_record->data.aaaa.address;
 104                 break;
 105
 106             default:
 107                 g_assert(FALSE);
 108         }
 109
 110         g_snprintf(sn, sizeof(sn), r->service_name);
 111         g_snprintf(st, sizeof(st), r->service_type);
 112
 113         if ((i = strlen(sn)) > 0 && sn[i-1] == '.')
 114             sn[i-1] = 0;
 115
 116         if ((i = strlen(st)) > 0 && st[i-1] == '.')
 117             st[i-1] = 0;
 118
 119         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);
 120
 121     }
 122 }
 123
 124 static void record_browser_callback(AvahiRecordBrowser*rr, AvahiIfIndex interface, AvahiProtocol protocol, AvahiBrowserEvent event, AvahiRecord *record, gpointer userdata) {
 125     AvahiServiceResolver *r = userdata;
 126
 127     g_assert(rr);
 128     g_assert(record);
 129     g_assert(r);
 130
 131     if (!(event == AVAHI_BROWSER_NEW))
 132         return;
 133
 134     if (r->interface > 0 && interface != r->interface)
 135         return;
 136
 137     if (r->protocol != AVAHI_PROTO_UNSPEC && protocol != r->protocol)
 138         return;
 139
 140     if (r->interface <= 0)
 141         r->interface = interface;
 142
 143     if (r->protocol == AVAHI_PROTO_UNSPEC)
 144         r->protocol = protocol;
 145
 146     switch (record->key->type) {
 147         case AVAHI_DNS_TYPE_SRV:
 148             if (!r->srv_record) {
 149                 r->srv_record = avahi_record_ref(record);
 150
 151                 g_assert(!r->record_browser_a && !r->record_browser_aaaa);
 152
 153                 if (r->address_protocol == AVAHI_PROTO_INET || r->address_protocol == AVAHI_PROTO_UNSPEC) {
 154                     AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
 155                     r->record_browser_a = avahi_record_browser_new(r->server, r->interface, r->protocol, k, record_browser_callback, r);
 156                     avahi_key_unref(k);
 157                 }
 158
 159                 if (r->address_protocol == AVAHI_PROTO_INET6 || r->address_protocol == AVAHI_PROTO_UNSPEC) {
 160                     AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
 161                     r->record_browser_aaaa = avahi_record_browser_new(r->server, r->interface, r->protocol, k, record_browser_callback, r);
 162                     avahi_key_unref(k);
 163                 }
 164             }
 165             break;
 166
 167         case AVAHI_DNS_TYPE_TXT:
 168             if (!r->txt_record)
 169                 r->txt_record = avahi_record_ref(record);
 170             break;
 171
 172         case AVAHI_DNS_TYPE_A:
 173         case AVAHI_DNS_TYPE_AAAA:
 174             if (!r->address_record)
 175                 r->address_record = avahi_record_ref(record);
 176             break;
 177
 178         default:
 179             g_assert(FALSE);
 180     }
 181
 182     if (r->txt_record && r->srv_record && r->address_record)
 183         finish(r, AVAHI_RESOLVER_FOUND);
 184 }
 185
 186 static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
 187     AvahiServiceResolver *r = userdata;
 188
 189     g_assert(e);
 190     g_assert(r);
 191
 192     finish(r, AVAHI_RESOLVER_TIMEOUT);
 193 }
 194
 195 AvahiServiceResolver *avahi_service_resolver_new(AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const gchar *name, const gchar *type, const gchar *domain, AvahiProtocol aprotocol, AvahiServiceResolverCallback callback, gpointer userdata) {
 196     AvahiServiceResolver *r;
 197     AvahiKey *k;
 198     GTimeVal tv;
 199     gchar t[256], *n;
 200     size_t l;
 201
 202     g_assert(server);
 203     g_assert(name);
 204     g_assert(type);
 205     g_assert(callback);
 206
 207     g_assert(aprotocol == AVAHI_PROTO_UNSPEC || aprotocol == AVAHI_PROTO_INET || aprotocol == AVAHI_PROTO_INET6);
 208
 209     if (!avahi_valid_service_name(name)) {
 210         avahi_server_set_errno(server, AVAHI_ERR_INVALID_SERVICE_NAME);
 211         return NULL;
 212     }
 213
 214     if (!avahi_valid_service_type(type)) {
 215         avahi_server_set_errno(server, AVAHI_ERR_INVALID_SERVICE_TYPE);
 216         return NULL;
 217     }
 218
 219     if (!avahi_valid_domain_name(domain)) {
 220         avahi_server_set_errno(server, AVAHI_ERR_INVALID_DOMAIN_NAME);
 221         return NULL;
 222     }
 223
 224     r = g_new(AvahiServiceResolver, 1);
 225     r->server = server;
 226     r->service_name = g_strdup(name);
 227     r->service_type = avahi_normalize_name(type);
 228     r->domain_name = avahi_normalize_name(domain);
 229     r->callback = callback;
 230     r->userdata = userdata;
 231     r->address_protocol = aprotocol;
 232     r->srv_record = r->txt_record = r->address_record = NULL;
 233     r->interface = interface;
 234     r->protocol = protocol;
 235
 236     n = t;
 237     l = sizeof(t);
 238     avahi_escape_label((const guint8*) name, strlen(name), &n, &l);
 239     g_snprintf(n, l, ".%s.%s", r->service_type, r->domain_name);
 240
 241     avahi_elapse_time(&tv, 1000, 0);
 242     r->time_event = avahi_time_event_queue_add(server->time_event_queue, &tv, time_event_callback, r);
 243
 244     AVAHI_LLIST_PREPEND(AvahiServiceResolver, resolver, server->service_resolvers, r);
 245
 246     r->record_browser_a = r->record_browser_aaaa = r->record_browser_srv = r->record_browser_txt = NULL;
 247
 248     k = avahi_key_new(t, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV);
 249     r->record_browser_srv = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 250     avahi_key_unref(k);
 251
 252     if (!r->record_browser_srv) {
 253         avahi_service_resolver_free(r);
 254         return NULL;
 255     }
 256
 257     k = avahi_key_new(t, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT);
 258     r->record_browser_txt = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 259     avahi_key_unref(k);
 260
 261     if (!r->record_browser_txt) {
 262         avahi_service_resolver_free(r);
 263         return NULL;
 264     }
 265
 266     return r;
 267 }
 268
 269 void avahi_service_resolver_free(AvahiServiceResolver *r) {
 270     g_assert(r);
 271
 272     AVAHI_LLIST_REMOVE(AvahiServiceResolver, resolver, r->server->service_resolvers, r);
 273
 274     if (r->time_event)
 275         avahi_time_event_queue_remove(r->server->time_event_queue, r->time_event);
 276
 277     if (r->record_browser_srv)
 278         avahi_record_browser_free(r->record_browser_srv);
 279     if (r->record_browser_txt)
 280         avahi_record_browser_free(r->record_browser_txt);
 281     if (r->record_browser_a)
 282         avahi_record_browser_free(r->record_browser_a);
 283     if (r->record_browser_aaaa)
 284         avahi_record_browser_free(r->record_browser_aaaa);
 285
 286     if (r->srv_record)
 287         avahi_record_unref(r->srv_record);
 288     if (r->txt_record)
 289         avahi_record_unref(r->txt_record);
 290     if (r->address_record)
 291         avahi_record_unref(r->address_record);
 292
 293     g_free(r->service_name);
 294     g_free(r->service_type);
 295     g_free(r->domain_name);
 296     g_free(r);
 297 }