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 #include <stdio.h>
  28
  29 #include <avahi-common/domain.h>
  30 #include <avahi-common/timeval.h>
  31 #include <avahi-common/malloc.h>
  32 #include <avahi-common/error.h>
  33
  34 #include "browse.h"
  35
  36 struct AvahiSServiceResolver {
  37     AvahiServer *server;
  38     char *service_name;
  39     char *service_type;
  40     char *domain_name;
  41     AvahiProtocol address_protocol;
  42
  43     AvahiIfIndex interface;
  44     AvahiProtocol protocol;
  45
  46     AvahiSRecordBrowser *record_browser_srv;
  47     AvahiSRecordBrowser *record_browser_txt;
  48     AvahiSRecordBrowser *record_browser_a;
  49     AvahiSRecordBrowser *record_browser_aaaa;
  50
  51     AvahiRecord *srv_record, *txt_record, *address_record;
  52
  53     AvahiSServiceResolverCallback callback;
  54     void* userdata;
  55
  56     AvahiTimeEvent *time_event;
  57
  58     AVAHI_LLIST_FIELDS(AvahiSServiceResolver, resolver);
  59 };
  60
  61 static void finish(AvahiSServiceResolver *r, AvahiResolverEvent event) {
  62     assert(r);
  63
  64     if (r->record_browser_a) {
  65         avahi_s_record_browser_free(r->record_browser_a);
  66         r->record_browser_a = NULL;
  67     }
  68
  69     if (r->record_browser_aaaa) {
  70         avahi_s_record_browser_free(r->record_browser_aaaa);
  71         r->record_browser_aaaa = NULL;
  72     }
  73
  74     if (r->record_browser_srv) {
  75         avahi_s_record_browser_free(r->record_browser_srv);
  76         r->record_browser_srv = NULL;
  77     }
  78
  79     if (r->record_browser_txt) {
  80         avahi_s_record_browser_free(r->record_browser_txt);
  81         r->record_browser_txt = NULL;
  82     }
  83
  84     if (r->time_event) {
  85         avahi_time_event_free(r->time_event);
  86         r->time_event = NULL;
  87     }
  88
  89     if (event == AVAHI_RESOLVER_TIMEOUT)
  90         r->callback(r, r->interface, r->protocol, event, r->service_name, r->service_type, r->domain_name, NULL, NULL, 0, NULL, r->userdata);
  91     else {
  92         AvahiAddress a;
  93         char sn[256], st[256];
  94         size_t i;
  95
  96         assert(r->srv_record);
  97         assert(r->txt_record);
  98         assert(r->address_record);
  99
 100         switch (r->address_record->key->type) {
 101             case AVAHI_DNS_TYPE_A:
 102                 a.family = AVAHI_PROTO_INET;
 103                 a.data.ipv4 = r->address_record->data.a.address;
 104                 break;
 105
 106             case AVAHI_DNS_TYPE_AAAA:
 107                 a.family = AVAHI_PROTO_INET6;
 108                 a.data.ipv6 = r->address_record->data.aaaa.address;
 109                 break;
 110
 111             default:
 112                 assert(0);
 113         }
 114
 115         snprintf(sn, sizeof(sn), r->service_name);
 116         snprintf(st, sizeof(st), r->service_type);
 117
 118         if ((i = strlen(sn)) > 0 && sn[i-1] == '.')
 119             sn[i-1] = 0;
 120
 121         if ((i = strlen(st)) > 0 && st[i-1] == '.')
 122             st[i-1] = 0;
 123
 124         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);
 125
 126     }
 127 }
 128
 129 static void record_browser_callback(AvahiSRecordBrowser*rr, AvahiIfIndex interface, AvahiProtocol protocol, AvahiBrowserEvent event, AvahiRecord *record, void* userdata) {
 130     AvahiSServiceResolver *r = userdata;
 131
 132     assert(rr);
 133     assert(record);
 134     assert(r);
 135
 136     if (!(event == AVAHI_BROWSER_NEW))
 137         return;
 138
 139     if (r->interface > 0 && interface != r->interface)
 140         return;
 141
 142     if (r->protocol != AVAHI_PROTO_UNSPEC && protocol != r->protocol)
 143         return;
 144
 145     if (r->interface <= 0)
 146         r->interface = interface;
 147
 148     if (r->protocol == AVAHI_PROTO_UNSPEC)
 149         r->protocol = protocol;
 150
 151     switch (record->key->type) {
 152         case AVAHI_DNS_TYPE_SRV:
 153             if (!r->srv_record) {
 154                 r->srv_record = avahi_record_ref(record);
 155
 156                 assert(!r->record_browser_a && !r->record_browser_aaaa);
 157
 158                 if (r->address_protocol == AVAHI_PROTO_INET || r->address_protocol == AVAHI_PROTO_UNSPEC) {
 159                     AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
 160                     r->record_browser_a = avahi_s_record_browser_new(r->server, r->interface, r->protocol, k, record_browser_callback, r);
 161                     avahi_key_unref(k);
 162                 }
 163
 164                 if (r->address_protocol == AVAHI_PROTO_INET6 || r->address_protocol == AVAHI_PROTO_UNSPEC) {
 165                     AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
 166                     r->record_browser_aaaa = avahi_s_record_browser_new(r->server, r->interface, r->protocol, k, record_browser_callback, r);
 167                     avahi_key_unref(k);
 168                 }
 169             }
 170             break;
 171
 172         case AVAHI_DNS_TYPE_TXT:
 173             if (!r->txt_record)
 174                 r->txt_record = avahi_record_ref(record);
 175             break;
 176
 177         case AVAHI_DNS_TYPE_A:
 178         case AVAHI_DNS_TYPE_AAAA:
 179             if (!r->address_record)
 180                 r->address_record = avahi_record_ref(record);
 181             break;
 182
 183         default:
 184             assert(0);
 185     }
 186
 187     if (r->txt_record && r->srv_record && r->address_record)
 188         finish(r, AVAHI_RESOLVER_FOUND);
 189 }
 190
 191 static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
 192     AvahiSServiceResolver *r = userdata;
 193
 194     assert(e);
 195     assert(r);
 196
 197     finish(r, AVAHI_RESOLVER_TIMEOUT);
 198 }
 199
 200 AvahiSServiceResolver *avahi_s_service_resolver_new(AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const char *name, const char *type, const char *domain, AvahiProtocol aprotocol, AvahiSServiceResolverCallback callback, void* userdata) {
 201     AvahiSServiceResolver *r;
 202     AvahiKey *k;
 203     struct timeval tv;
 204     char t[256], *n;
 205     size_t l;
 206
 207     assert(server);
 208     assert(name);
 209     assert(type);
 210     assert(callback);
 211
 212     assert(aprotocol == AVAHI_PROTO_UNSPEC || aprotocol == AVAHI_PROTO_INET || aprotocol == AVAHI_PROTO_INET6);
 213
 214     if (!avahi_is_valid_service_name(name)) {
 215         avahi_server_set_errno(server, AVAHI_ERR_INVALID_SERVICE_NAME);
 216         return NULL;
 217     }
 218
 219     if (!avahi_is_valid_service_type(type)) {
 220         avahi_server_set_errno(server, AVAHI_ERR_INVALID_SERVICE_TYPE);
 221         return NULL;
 222     }
 223
 224     if (!avahi_is_valid_domain_name(domain)) {
 225         avahi_server_set_errno(server, AVAHI_ERR_INVALID_DOMAIN_NAME);
 226         return NULL;
 227     }
 228
 229     if (!(r = avahi_new(AvahiSServiceResolver, 1))) {
 230         avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
 231         return NULL;
 232     }
 233
 234     r->server = server;
 235     r->service_name = avahi_strdup(name);
 236     r->service_type = avahi_normalize_name(type);
 237     r->domain_name = avahi_normalize_name(domain);
 238     r->callback = callback;
 239     r->userdata = userdata;
 240     r->address_protocol = aprotocol;
 241     r->srv_record = r->txt_record = r->address_record = NULL;
 242     r->interface = interface;
 243     r->protocol = protocol;
 244
 245     n = t;
 246     l = sizeof(t);
 247     avahi_escape_label((const uint8_t*) name, strlen(name), &n, &l);
 248     snprintf(n, l, ".%s.%s", r->service_type, r->domain_name);
 249
 250     avahi_elapse_time(&tv, 1000, 0);
 251     r->time_event = avahi_time_event_new(server->time_event_queue, &tv, time_event_callback, r);
 252
 253     AVAHI_LLIST_PREPEND(AvahiSServiceResolver, resolver, server->service_resolvers, r);
 254
 255     r->record_browser_a = r->record_browser_aaaa = r->record_browser_srv = r->record_browser_txt = NULL;
 256
 257     k = avahi_key_new(t, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV);
 258     r->record_browser_srv = avahi_s_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 259     avahi_key_unref(k);
 260
 261     if (!r->record_browser_srv) {
 262         avahi_s_service_resolver_free(r);
 263         return NULL;
 264     }
 265
 266     k = avahi_key_new(t, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT);
 267     r->record_browser_txt = avahi_s_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
 268     avahi_key_unref(k);
 269
 270     if (!r->record_browser_txt) {
 271         avahi_s_service_resolver_free(r);
 272         return NULL;
 273     }
 274
 275     return r;
 276 }
 277
 278 void avahi_s_service_resolver_free(AvahiSServiceResolver *r) {
 279     assert(r);
 280
 281     AVAHI_LLIST_REMOVE(AvahiSServiceResolver, resolver, r->server->service_resolvers, r);
 282
 283     if (r->time_event)
 284         avahi_time_event_free(r->time_event);
 285
 286     if (r->record_browser_srv)
 287         avahi_s_record_browser_free(r->record_browser_srv);
 288     if (r->record_browser_txt)
 289         avahi_s_record_browser_free(r->record_browser_txt);
 290     if (r->record_browser_a)
 291         avahi_s_record_browser_free(r->record_browser_a);
 292     if (r->record_browser_aaaa)
 293         avahi_s_record_browser_free(r->record_browser_aaaa);
 294
 295     if (r->srv_record)
 296         avahi_record_unref(r->srv_record);
 297     if (r->txt_record)
 298         avahi_record_unref(r->txt_record);
 299     if (r->address_record)
 300         avahi_record_unref(r->address_record);
 301
 302     avahi_free(r->service_name);
 303     avahi_free(r->service_type);
 304     avahi_free(r->domain_name);
 305     avahi_free(r);
 306 }