git.meshlink.io Git - catta/blob - avahi-client/client.c

   1 /***
   2   This file is part of avahi.
   3
   4   avahi is free software; you can redistribute it and/or modify it
   5   under the terms of the GNU Lesser General Public License as
   6   published by the Free Software Foundation; either version 2.1 of the
   7   License, or (at your option) any later version.
   8
   9   avahi is distributed in the hope that it will be useful, but WITHOUT
  10   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11   or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
  12   Public License for more details.
  13
  14   You should have received a copy of the GNU Lesser General Public
  15   License along with avahi; if not, write to the Free Software
  16   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  17   USA.
  18 ***/
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <string.h>
  27
  28 #include <dbus/dbus.h>
  29
  30 #include <avahi-common/dbus.h>
  31 #include <avahi-common/llist.h>
  32 #include <avahi-common/error.h>
  33 #include <avahi-common/dbus.h>
  34 #include <avahi-common/malloc.h>
  35 #include <avahi-common/dbus-watch-glue.h>
  36 #include <avahi-common/i18n.h>
  37
  38 #include "client.h"
  39 #include "internal.h"
  40
  41 #define AVAHI_CLIENT_DBUS_API_SUPPORTED ((uint32_t) 0x0201)
  42
  43 static int init_server(AvahiClient *client, int *ret_error);
  44
  45 int avahi_client_set_errno (AvahiClient *client, int error) {
  46     assert(client);
  47
  48     return client->error = error;
  49 }
  50
  51 int avahi_client_set_dbus_error(AvahiClient *client, DBusError *error) {
  52     assert(client);
  53     assert(error);
  54
  55     return avahi_client_set_errno(client, avahi_error_dbus_to_number(error->name));
  56 }
  57
  58 static void client_set_state(AvahiClient *client, AvahiClientState state) {
  59     assert(client);
  60
  61     if (client->state == state)
  62         return;
  63
  64     client->state = state;
  65
  66     switch (client->state) {
  67         case AVAHI_CLIENT_FAILURE:
  68             if (client->bus) {
  69 #ifdef HAVE_DBUS_CONNECTION_CLOSE
  70                 dbus_connection_close(client->bus);
  71 #else
  72                 dbus_connection_disconnect(client->bus);
  73 #endif
  74                 dbus_connection_unref(client->bus);
  75                 client->bus = NULL;
  76             }
  77
  78             /* Fall through */
  79
  80         case AVAHI_CLIENT_S_COLLISION:
  81         case AVAHI_CLIENT_S_REGISTERING:
  82
  83             /* Clear cached strings */
  84             avahi_free(client->host_name);
  85             avahi_free(client->host_name_fqdn);
  86             avahi_free(client->domain_name);
  87
  88             client->host_name =  NULL;
  89             client->host_name_fqdn = NULL;
  90             client->domain_name = NULL;
  91             break;
  92
  93         case AVAHI_CLIENT_S_RUNNING:
  94         case AVAHI_CLIENT_CONNECTING:
  95             break;
  96
  97     }
  98
  99     if (client->callback)
 100         client->callback (client, state, client->userdata);
 101 }
 102
 103 static DBusHandlerResult filter_func(DBusConnection *bus, DBusMessage *message, void *userdata) {
 104     AvahiClient *client = userdata;
 105     DBusError error;
 106
 107     assert(bus);
 108     assert(message);
 109
 110     dbus_error_init(&error);
 111
 112 /*     fprintf(stderr, "dbus: interface=%s, path=%s, member=%s\n", */
 113 /*             dbus_message_get_interface (message), */
 114 /*             dbus_message_get_path (message), */
 115 /*             dbus_message_get_member (message)); */
 116
 117     if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
 118
 119         /* The DBUS server died or kicked us */
 120         avahi_client_set_errno(client, AVAHI_ERR_DISCONNECTED);
 121         goto fail;
 122
 123     } else if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS, "NameAcquired")) {
 124
 125         /* Ignore this message */
 126
 127     } else if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS, "NameOwnerChanged")) {
 128         char *name, *old, *new;
 129
 130         if (!dbus_message_get_args(
 131                   message, &error,
 132                   DBUS_TYPE_STRING, &name,
 133                   DBUS_TYPE_STRING, &old,
 134                   DBUS_TYPE_STRING, &new,
 135                   DBUS_TYPE_INVALID) || dbus_error_is_set(&error)) {
 136
 137             fprintf(stderr, "WARNING: Failed to parse NameOwnerChanged signal: %s\n", error.message);
 138             avahi_client_set_errno(client, AVAHI_ERR_DBUS_ERROR);
 139             goto fail;
 140         }
 141
 142         if (strcmp(name, AVAHI_DBUS_NAME) == 0) {
 143
 144             if (old[0] &&
 145                 avahi_client_is_connected(client)) {
 146
 147                 /* Regardless if the server lost its name or
 148                  * if the name was transfered: our services are no longer
 149                  * available, so we disconnect ourselves */
 150                 avahi_client_set_errno(client, AVAHI_ERR_DISCONNECTED);
 151                 goto fail;
 152
 153             } else if (client->state == AVAHI_CLIENT_CONNECTING && (!old || *old == 0)) {
 154                 int ret;
 155
 156                 /* Server appeared */
 157
 158                 if ((ret = init_server(client, NULL)) < 0) {
 159                     avahi_client_set_errno(client, ret);
 160                     goto fail;
 161                 }
 162             }
 163         }
 164
 165     } else if (!avahi_client_is_connected(client)) {
 166
 167         /* Ignore messages we get in unconnected state */
 168
 169     } else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_SERVER, "StateChanged")) {
 170         int32_t state;
 171         char *e = NULL;
 172         int c;
 173
 174         if (!dbus_message_get_args(
 175                   message, &error,
 176                   DBUS_TYPE_INT32, &state,
 177                   DBUS_TYPE_STRING, &e,
 178                   DBUS_TYPE_INVALID) || dbus_error_is_set (&error)) {
 179
 180             fprintf(stderr, "WARNING: Failed to parse Server.StateChanged signal: %s\n", error.message);
 181             avahi_client_set_errno(client, AVAHI_ERR_DBUS_ERROR);
 182             goto fail;
 183         }
 184
 185         if ((c = avahi_error_dbus_to_number(e)) != AVAHI_OK)
 186             avahi_client_set_errno(client, c);
 187
 188         client_set_state(client, (AvahiClientState) state);
 189
 190     } else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_ENTRY_GROUP, "StateChanged")) {
 191         const char *path;
 192         AvahiEntryGroup *g;
 193         path = dbus_message_get_path(message);
 194
 195         for (g = client->groups; g; g = g->groups_next)
 196             if (strcmp(g->path, path) == 0)
 197                 break;
 198
 199         if (g) {
 200             int32_t state;
 201             char *e;
 202             int c;
 203
 204             if (!dbus_message_get_args(
 205                       message, &error,
 206                       DBUS_TYPE_INT32, &state,
 207                       DBUS_TYPE_STRING, &e,
 208                       DBUS_TYPE_INVALID) ||
 209                 dbus_error_is_set(&error)) {
 210
 211                 fprintf(stderr, "WARNING: Failed to parse EntryGroup.StateChanged signal: %s\n", error.message);
 212                 avahi_client_set_errno(client, AVAHI_ERR_DBUS_ERROR);
 213                 goto fail;
 214             }
 215
 216             if ((c = avahi_error_dbus_to_number(e)) != AVAHI_OK)
 217                 avahi_client_set_errno(client, c);
 218
 219             avahi_entry_group_set_state(g, state);
 220         }
 221
 222     } else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "ItemNew"))
 223         return avahi_domain_browser_event(client, AVAHI_BROWSER_NEW, message);
 224     else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "ItemRemove"))
 225         return avahi_domain_browser_event(client, AVAHI_BROWSER_REMOVE, message);
 226     else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "CacheExhausted"))
 227         return avahi_domain_browser_event(client, AVAHI_BROWSER_CACHE_EXHAUSTED, message);
 228     else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "AllForNow"))
 229         return avahi_domain_browser_event(client, AVAHI_BROWSER_ALL_FOR_NOW, message);
 230     else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "Failure"))
 231         return avahi_domain_browser_event(client, AVAHI_BROWSER_FAILURE, message);
 232
 233     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "ItemNew"))
 234         return avahi_service_type_browser_event (client, AVAHI_BROWSER_NEW, message);
 235     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "ItemRemove"))
 236         return avahi_service_type_browser_event (client, AVAHI_BROWSER_REMOVE, message);
 237     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "CacheExhausted"))
 238         return avahi_service_type_browser_event (client, AVAHI_BROWSER_CACHE_EXHAUSTED, message);
 239     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "AllForNow"))
 240         return avahi_service_type_browser_event (client, AVAHI_BROWSER_ALL_FOR_NOW, message);
 241     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "Failure"))
 242         return avahi_service_type_browser_event (client, AVAHI_BROWSER_FAILURE, message);
 243
 244     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "ItemNew"))
 245         return avahi_service_browser_event (client, AVAHI_BROWSER_NEW, message);
 246     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "ItemRemove"))
 247         return avahi_service_browser_event (client, AVAHI_BROWSER_REMOVE, message);
 248     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "CacheExhausted"))
 249         return avahi_service_browser_event (client, AVAHI_BROWSER_CACHE_EXHAUSTED, message);
 250     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "AllForNow"))
 251         return avahi_service_browser_event (client, AVAHI_BROWSER_ALL_FOR_NOW, message);
 252     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "Failure"))
 253         return avahi_service_browser_event (client, AVAHI_BROWSER_FAILURE, message);
 254
 255     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_RESOLVER, "Found"))
 256         return avahi_service_resolver_event (client, AVAHI_RESOLVER_FOUND, message);
 257     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_RESOLVER, "Failure"))
 258         return avahi_service_resolver_event (client, AVAHI_RESOLVER_FAILURE, message);
 259
 260     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_HOST_NAME_RESOLVER, "Found"))
 261         return avahi_host_name_resolver_event (client, AVAHI_RESOLVER_FOUND, message);
 262     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_HOST_NAME_RESOLVER, "Failure"))
 263         return avahi_host_name_resolver_event (client, AVAHI_RESOLVER_FAILURE, message);
 264
 265     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_ADDRESS_RESOLVER, "Found"))
 266         return avahi_address_resolver_event (client, AVAHI_RESOLVER_FOUND, message);
 267     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_ADDRESS_RESOLVER, "Failure"))
 268         return avahi_address_resolver_event (client, AVAHI_RESOLVER_FAILURE, message);
 269
 270     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_RECORD_BROWSER, "ItemNew"))
 271         return avahi_record_browser_event (client, AVAHI_BROWSER_NEW, message);
 272     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_RECORD_BROWSER, "ItemRemove"))
 273         return avahi_record_browser_event (client, AVAHI_BROWSER_REMOVE, message);
 274     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_RECORD_BROWSER, "CacheExhausted"))
 275         return avahi_record_browser_event (client, AVAHI_BROWSER_CACHE_EXHAUSTED, message);
 276     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_RECORD_BROWSER, "AllForNow"))
 277         return avahi_record_browser_event (client, AVAHI_BROWSER_ALL_FOR_NOW, message);
 278     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_RECORD_BROWSER, "Failure"))
 279         return avahi_record_browser_event (client, AVAHI_BROWSER_FAILURE, message);
 280
 281     else {
 282
 283         fprintf(stderr, "WARNING: Unhandled message: interface=%s, path=%s, member=%s\n",
 284                dbus_message_get_interface(message),
 285                dbus_message_get_path(message),
 286                dbus_message_get_member(message));
 287
 288         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 289     }
 290
 291     return DBUS_HANDLER_RESULT_HANDLED;
 292
 293 fail:
 294
 295     if (dbus_error_is_set(&error)) {
 296         avahi_client_set_errno(client, avahi_error_dbus_to_number(error.name));
 297         dbus_error_free(&error);
 298     }
 299
 300     client_set_state(client, AVAHI_CLIENT_FAILURE);
 301
 302     return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 303 }
 304
 305 static int get_server_state(AvahiClient *client, int *ret_error) {
 306     DBusMessage *message = NULL, *reply = NULL;
 307     DBusError error;
 308     int32_t state;
 309     int e = AVAHI_ERR_NO_MEMORY;
 310
 311     assert(client);
 312
 313     dbus_error_init(&error);
 314
 315     if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "GetState")))
 316         goto fail;
 317
 318     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 319
 320     if (!reply || dbus_error_is_set (&error))
 321         goto fail;
 322
 323     if (!dbus_message_get_args(reply, &error, DBUS_TYPE_INT32, &state, DBUS_TYPE_INVALID) ||
 324         dbus_error_is_set (&error))
 325         goto fail;
 326
 327     client_set_state(client, (AvahiClientState) state);
 328
 329     dbus_message_unref(message);
 330     dbus_message_unref(reply);
 331
 332     return AVAHI_OK;
 333
 334 fail:
 335     if (dbus_error_is_set(&error)) {
 336         e = avahi_error_dbus_to_number (error.name);
 337         dbus_error_free(&error);
 338     }
 339
 340     if (ret_error)
 341         *ret_error = e;
 342
 343     if (message)
 344         dbus_message_unref(message);
 345     if (reply)
 346         dbus_message_unref(reply);
 347
 348     return e;
 349 }
 350
 351 static int check_version(AvahiClient *client, int *ret_error) {
 352     DBusMessage *message = NULL, *reply  = NULL;
 353     DBusError error;
 354     uint32_t version;
 355     int e = AVAHI_ERR_NO_MEMORY;
 356
 357     assert(client);
 358
 359     dbus_error_init(&error);
 360
 361     if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "GetAPIVersion")))
 362         goto fail;
 363
 364     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 365
 366     if (!reply || dbus_error_is_set (&error)) {
 367         char *version_str;
 368
 369         if (!dbus_error_is_set(&error) || strcmp(error.name, DBUS_ERROR_UNKNOWN_METHOD))
 370             goto fail;
 371
 372         /* If the method GetAPIVersion is not known, we look if
 373          * GetVersionString matches "avahi 0.6" which is the only
 374          * version we support which doesn't have GetAPIVersion() .*/
 375
 376         dbus_message_unref(message);
 377         if (reply) dbus_message_unref(reply);
 378         dbus_error_free(&error);
 379
 380         if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "GetVersionString")))
 381             goto fail;
 382
 383         reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 384
 385         if (!reply || dbus_error_is_set (&error))
 386             goto fail;
 387
 388         if (!dbus_message_get_args (reply, &error, DBUS_TYPE_STRING, &version_str, DBUS_TYPE_INVALID) ||
 389             dbus_error_is_set (&error))
 390             goto fail;
 391
 392         version = strcmp(version_str, "avahi 0.6") == 0 ? 0x0201 : 0x0000;
 393
 394     } else {
 395
 396         if (!dbus_message_get_args (reply, &error, DBUS_TYPE_UINT32, &version, DBUS_TYPE_INVALID) ||
 397             dbus_error_is_set(&error))
 398             goto fail;
 399     }
 400
 401     /*fprintf(stderr, "API Version 0x%04x\n", version);*/
 402
 403     if ((version & 0xFF00) != (AVAHI_CLIENT_DBUS_API_SUPPORTED & 0xFF00) ||
 404         (version & 0x00FF) < (AVAHI_CLIENT_DBUS_API_SUPPORTED & 0x00FF)) {
 405         e = AVAHI_ERR_VERSION_MISMATCH;
 406         goto fail;
 407     }
 408
 409     dbus_message_unref(message);
 410     dbus_message_unref(reply);
 411
 412     return AVAHI_OK;
 413
 414 fail:
 415     if (dbus_error_is_set(&error)) {
 416         e = avahi_error_dbus_to_number (error.name);
 417         dbus_error_free(&error);
 418     }
 419
 420     if (ret_error)
 421         *ret_error = e;
 422
 423     if (message)
 424         dbus_message_unref(message);
 425     if (reply)
 426         dbus_message_unref(reply);
 427
 428     return e;
 429 }
 430
 431 static int init_server(AvahiClient *client, int *ret_error) {
 432     int r;
 433
 434     if ((r = check_version(client, ret_error)) < 0)
 435         return r;
 436
 437     if ((r = get_server_state(client, ret_error)) < 0)
 438         return r;
 439
 440     return AVAHI_OK;
 441 }
 442
 443 /* This function acts like dbus_bus_get but creates a private
 444  * connection instead.  */
 445 static DBusConnection* avahi_dbus_bus_get(DBusError *error) {
 446     DBusConnection *c;
 447
 448 #ifdef HAVE_DBUS_BUS_GET_PRIVATE
 449     if (!(c = dbus_bus_get_private(DBUS_BUS_SYSTEM, error)))
 450         return NULL;
 451
 452     dbus_connection_set_exit_on_disconnect(c, FALSE);
 453 #else
 454     const char *a;
 455
 456     if (!(a = getenv("DBUS_SYSTEM_BUS_ADDRESS")) || !*a)
 457         a = DBUS_SYSTEM_BUS_DEFAULT_ADDRESS;
 458
 459     if (!(c = dbus_connection_open_private(a, error)))
 460         return NULL;
 461
 462     dbus_connection_set_exit_on_disconnect(c, FALSE);
 463
 464     if (!dbus_bus_register(c, error)) {
 465 #ifdef HAVE_DBUS_CONNECTION_CLOSE
 466         dbus_connection_close(c);
 467 #else
 468         dbus_connection_disconnect(c);
 469 #endif
 470         dbus_connection_unref(c);
 471         return NULL;
 472     }
 473 #endif
 474
 475     return c;
 476 }
 477
 478 AvahiClient *avahi_client_new(const AvahiPoll *poll_api, AvahiClientFlags flags, AvahiClientCallback callback, void *userdata, int *ret_error) {
 479     AvahiClient *client = NULL;
 480     DBusError error;
 481
 482     avahi_init_i18n();
 483
 484     dbus_error_init(&error);
 485
 486     if (!(client = avahi_new(AvahiClient, 1))) {
 487         if (ret_error)
 488             *ret_error = AVAHI_ERR_NO_MEMORY;
 489         goto fail;
 490     }
 491
 492     client->poll_api = poll_api;
 493     client->error = AVAHI_OK;
 494     client->callback = callback;
 495     client->userdata = userdata;
 496     client->state = (AvahiClientState) -1;
 497     client->flags = flags;
 498
 499     client->host_name = NULL;
 500     client->host_name_fqdn = NULL;
 501     client->domain_name = NULL;
 502     client->version_string = NULL;
 503     client->local_service_cookie_valid = 0;
 504
 505     AVAHI_LLIST_HEAD_INIT(AvahiEntryGroup, client->groups);
 506     AVAHI_LLIST_HEAD_INIT(AvahiDomainBrowser, client->domain_browsers);
 507     AVAHI_LLIST_HEAD_INIT(AvahiServiceBrowser, client->service_browsers);
 508     AVAHI_LLIST_HEAD_INIT(AvahiServiceTypeBrowser, client->service_type_browsers);
 509     AVAHI_LLIST_HEAD_INIT(AvahiServiceResolver, client->service_resolvers);
 510     AVAHI_LLIST_HEAD_INIT(AvahiHostNameResolver, client->host_name_resolvers);
 511     AVAHI_LLIST_HEAD_INIT(AvahiAddressResolver, client->address_resolvers);
 512     AVAHI_LLIST_HEAD_INIT(AvahiRecordBrowser, client->record_browsers);
 513
 514     if (!(client->bus = avahi_dbus_bus_get(&error)) || dbus_error_is_set(&error)) {
 515         if (ret_error)
 516             *ret_error = AVAHI_ERR_DBUS_ERROR;
 517         goto fail;
 518     }
 519
 520     if (avahi_dbus_connection_glue(client->bus, poll_api) < 0) {
 521         if (ret_error)
 522             *ret_error = AVAHI_ERR_NO_MEMORY; /* Not optimal */
 523         goto fail;
 524     }
 525
 526     if (!dbus_connection_add_filter(client->bus, filter_func, client, NULL)) {
 527         if (ret_error)
 528             *ret_error = AVAHI_ERR_NO_MEMORY;
 529         goto fail;
 530     }
 531
 532     dbus_bus_add_match(
 533         client->bus,
 534         "type='signal', "
 535         "interface='" AVAHI_DBUS_INTERFACE_SERVER "', "
 536         "sender='" AVAHI_DBUS_NAME "', "
 537         "path='" AVAHI_DBUS_PATH_SERVER "'",
 538         &error);
 539
 540     if (dbus_error_is_set(&error))
 541         goto fail;
 542
 543     dbus_bus_add_match (
 544         client->bus,
 545         "type='signal', "
 546         "interface='" DBUS_INTERFACE_DBUS "', "
 547         "sender='" DBUS_SERVICE_DBUS "', "
 548         "path='" DBUS_PATH_DBUS "'",
 549         &error);
 550
 551     if (dbus_error_is_set(&error))
 552         goto fail;
 553
 554     dbus_bus_add_match (
 555         client->bus,
 556         "type='signal', "
 557         "interface='" DBUS_INTERFACE_LOCAL "'",
 558         &error);
 559
 560     if (dbus_error_is_set(&error))
 561         goto fail;
 562
 563     if (!dbus_bus_start_service_by_name(client->bus, AVAHI_DBUS_NAME, 0, NULL, &error)) {
 564
 565         /* We free the error so its not set, that way the fail target
 566          * will return the NO_DAEMON error rather than a DBUS error */
 567         dbus_error_free(&error);
 568
 569         if (!(flags & AVAHI_CLIENT_NO_FAIL)) {
 570
 571             if (ret_error)
 572                 *ret_error = AVAHI_ERR_NO_DAEMON;
 573
 574             goto fail;
 575         }
 576
 577         /* The user doesn't want this call to fail if the daemon is not
 578          * available, so let's return succesfully */
 579         client_set_state(client, AVAHI_CLIENT_CONNECTING);
 580
 581     } else {
 582
 583         if (init_server(client, ret_error) < 0)
 584             goto fail;
 585     }
 586
 587     return client;
 588
 589 fail:
 590
 591     if (client)
 592         avahi_client_free(client);
 593
 594     if (dbus_error_is_set(&error)) {
 595
 596         if (ret_error) {
 597             if (strcmp(error.name, DBUS_ERROR_FILE_NOT_FOUND) == 0)
 598                 /* DBUS returns this error when the DBUS daemon is not running */
 599                 *ret_error = AVAHI_ERR_NO_DAEMON;
 600             else
 601                 *ret_error = avahi_error_dbus_to_number(error.name);
 602         }
 603
 604         dbus_error_free(&error);
 605     }
 606
 607     return NULL;
 608 }
 609
 610 void avahi_client_free(AvahiClient *client) {
 611     assert(client);
 612
 613     if (client->bus)
 614         /* Disconnect in advance, so that the free() functions won't
 615          * issue needless server calls */
 616 #ifdef HAVE_DBUS_CONNECTION_CLOSE
 617         dbus_connection_close(client->bus);
 618 #else
 619         dbus_connection_disconnect(client->bus);
 620 #endif
 621
 622     while (client->groups)
 623         avahi_entry_group_free(client->groups);
 624
 625     while (client->domain_browsers)
 626         avahi_domain_browser_free(client->domain_browsers);
 627
 628     while (client->service_browsers)
 629         avahi_service_browser_free(client->service_browsers);
 630
 631     while (client->service_type_browsers)
 632         avahi_service_type_browser_free(client->service_type_browsers);
 633
 634     while (client->service_resolvers)
 635         avahi_service_resolver_free(client->service_resolvers);
 636
 637     while (client->host_name_resolvers)
 638         avahi_host_name_resolver_free(client->host_name_resolvers);
 639
 640     while (client->address_resolvers)
 641         avahi_address_resolver_free(client->address_resolvers);
 642
 643     while (client->record_browsers)
 644         avahi_record_browser_free(client->record_browsers);
 645
 646     if (client->bus)
 647         dbus_connection_unref(client->bus);
 648
 649     avahi_free(client->version_string);
 650     avahi_free(client->host_name);
 651     avahi_free(client->host_name_fqdn);
 652     avahi_free(client->domain_name);
 653
 654     avahi_free(client);
 655 }
 656
 657 static char* avahi_client_get_string_reply_and_block (AvahiClient *client, const char *method, const char *param) {
 658     DBusMessage *message = NULL, *reply = NULL;
 659     DBusError error;
 660     char *ret, *n;
 661
 662     assert(client);
 663     assert(method);
 664
 665     dbus_error_init (&error);
 666
 667     if (!(message = dbus_message_new_method_call (AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, method))) {
 668         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 669         goto fail;
 670     }
 671
 672     if (param) {
 673         if (!dbus_message_append_args (message, DBUS_TYPE_STRING, &param, DBUS_TYPE_INVALID)) {
 674             avahi_client_set_errno (client, AVAHI_ERR_NO_MEMORY);
 675             goto fail;
 676         }
 677     }
 678
 679     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 680
 681     if (!reply || dbus_error_is_set (&error))
 682         goto fail;
 683
 684     if (!dbus_message_get_args (reply, &error, DBUS_TYPE_STRING, &ret, DBUS_TYPE_INVALID) ||
 685         dbus_error_is_set (&error))
 686         goto fail;
 687
 688     if (!(n = avahi_strdup(ret))) {
 689         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 690         goto fail;
 691     }
 692
 693     dbus_message_unref(message);
 694     dbus_message_unref(reply);
 695
 696     return n;
 697
 698 fail:
 699
 700     if (message)
 701         dbus_message_unref(message);
 702     if (reply)
 703         dbus_message_unref(reply);
 704
 705     if (dbus_error_is_set(&error)) {
 706         avahi_client_set_dbus_error(client, &error);
 707         dbus_error_free(&error);
 708     }
 709
 710     return NULL;
 711 }
 712
 713 const char* avahi_client_get_version_string(AvahiClient *client) {
 714     assert(client);
 715
 716     if (!avahi_client_is_connected(client)) {
 717         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 718         return NULL;
 719     }
 720
 721     if (!client->version_string)
 722         client->version_string = avahi_client_get_string_reply_and_block(client, "GetVersionString", NULL);
 723
 724     return client->version_string;
 725 }
 726
 727 const char* avahi_client_get_domain_name(AvahiClient *client) {
 728     assert(client);
 729
 730     if (!avahi_client_is_connected(client)) {
 731         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 732         return NULL;
 733     }
 734
 735     if (!client->domain_name)
 736         client->domain_name = avahi_client_get_string_reply_and_block(client, "GetDomainName", NULL);
 737
 738     return client->domain_name;
 739 }
 740
 741 const char* avahi_client_get_host_name(AvahiClient *client) {
 742     assert(client);
 743
 744     if (!avahi_client_is_connected(client)) {
 745         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 746         return NULL;
 747     }
 748
 749     if (!client->host_name)
 750         client->host_name = avahi_client_get_string_reply_and_block(client, "GetHostName", NULL);
 751
 752     return client->host_name;
 753 }
 754
 755 const char* avahi_client_get_host_name_fqdn (AvahiClient *client) {
 756     assert(client);
 757
 758     if (!avahi_client_is_connected(client)) {
 759         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 760         return NULL;
 761     }
 762
 763     if (!client->host_name_fqdn)
 764         client->host_name_fqdn = avahi_client_get_string_reply_and_block(client, "GetHostNameFqdn", NULL);
 765
 766     return client->host_name_fqdn;
 767 }
 768
 769 AvahiClientState avahi_client_get_state(AvahiClient *client) {
 770     assert(client);
 771
 772     return client->state;
 773 }
 774
 775 int avahi_client_errno(AvahiClient *client) {
 776     assert(client);
 777
 778     return client->error;
 779 }
 780
 781 /* Just for internal use */
 782 int avahi_client_simple_method_call(AvahiClient *client, const char *path, const char *interface, const char *method) {
 783     DBusMessage *message = NULL, *reply = NULL;
 784     DBusError error;
 785     int r = AVAHI_OK;
 786
 787     dbus_error_init(&error);
 788
 789     assert(client);
 790     assert(path);
 791     assert(interface);
 792     assert(method);
 793
 794     if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, path, interface, method))) {
 795         r = avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 796         goto fail;
 797     }
 798
 799     if (!(reply = dbus_connection_send_with_reply_and_block(client->bus, message, -1, &error)) ||
 800         dbus_error_is_set (&error)) {
 801         r = avahi_client_set_errno(client, AVAHI_ERR_DBUS_ERROR);
 802         goto fail;
 803     }
 804
 805     if (!dbus_message_get_args(reply, &error, DBUS_TYPE_INVALID) ||
 806         dbus_error_is_set (&error)) {
 807         r = avahi_client_set_errno(client, AVAHI_ERR_DBUS_ERROR);
 808         goto fail;
 809     }
 810
 811     dbus_message_unref(message);
 812     dbus_message_unref(reply);
 813
 814     return AVAHI_OK;
 815
 816 fail:
 817     if (dbus_error_is_set(&error)) {
 818         r = avahi_client_set_dbus_error(client, &error);
 819         dbus_error_free(&error);
 820     }
 821
 822     if (message)
 823         dbus_message_unref(message);
 824
 825     if (reply)
 826         dbus_message_unref(reply);
 827
 828     return r;
 829 }
 830
 831 uint32_t avahi_client_get_local_service_cookie(AvahiClient *client) {
 832     DBusMessage *message = NULL, *reply = NULL;
 833     DBusError error;
 834     assert(client);
 835
 836     if (!avahi_client_is_connected(client)) {
 837         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 838         return AVAHI_SERVICE_COOKIE_INVALID;
 839     }
 840
 841     if (client->local_service_cookie_valid)
 842         return client->local_service_cookie;
 843
 844     dbus_error_init (&error);
 845
 846     if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "GetLocalServiceCookie"))) {
 847         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 848         goto fail;
 849     }
 850
 851     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 852
 853     if (!reply || dbus_error_is_set (&error))
 854         goto fail;
 855
 856     if (!dbus_message_get_args (reply, &error, DBUS_TYPE_UINT32, &client->local_service_cookie, DBUS_TYPE_INVALID) ||
 857         dbus_error_is_set (&error))
 858         goto fail;
 859
 860     dbus_message_unref(message);
 861     dbus_message_unref(reply);
 862
 863     client->local_service_cookie_valid = 1;
 864     return client->local_service_cookie;
 865
 866 fail:
 867
 868     if (message)
 869         dbus_message_unref(message);
 870     if (reply)
 871         dbus_message_unref(reply);
 872
 873     if (dbus_error_is_set(&error)) {
 874         avahi_client_set_dbus_error(client, &error);
 875         dbus_error_free(&error);
 876     }
 877
 878     return AVAHI_SERVICE_COOKIE_INVALID;
 879 }
 880
 881 int avahi_client_is_connected(AvahiClient *client) {
 882     assert(client);
 883
 884     return
 885         client->bus &&
 886         dbus_connection_get_is_connected(client->bus) &&
 887         (client->state == AVAHI_CLIENT_S_RUNNING || client->state == AVAHI_CLIENT_S_REGISTERING || client->state == AVAHI_CLIENT_S_COLLISION);
 888 }
 889
 890 int avahi_client_set_host_name(AvahiClient* client, const char *name) {
 891     DBusMessage *message = NULL, *reply = NULL;
 892     DBusError error;
 893
 894     assert(client);
 895
 896     if (!avahi_client_is_connected(client))
 897         return avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 898
 899     dbus_error_init (&error);
 900
 901     if (!(message = dbus_message_new_method_call (AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "SetHostName"))) {
 902         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 903         goto fail;
 904     }
 905
 906     if (!dbus_message_append_args (message, DBUS_TYPE_STRING, &name, DBUS_TYPE_INVALID)) {
 907         avahi_client_set_errno (client, AVAHI_ERR_NO_MEMORY);
 908         goto fail;
 909     }
 910
 911     reply = dbus_connection_send_with_reply_and_block(client->bus, message, -1, &error);
 912
 913     if (!reply || dbus_error_is_set (&error))
 914         goto fail;
 915
 916     if (!dbus_message_get_args(reply, &error, DBUS_TYPE_INVALID) ||
 917         dbus_error_is_set (&error))
 918         goto fail;
 919
 920     dbus_message_unref(message);
 921     dbus_message_unref(reply);
 922
 923     avahi_free(client->host_name);
 924     client->host_name = NULL;
 925     avahi_free(client->host_name_fqdn);
 926     client->host_name_fqdn = NULL;
 927
 928     return 0;
 929
 930 fail:
 931
 932     if (message)
 933         dbus_message_unref(message);
 934     if (reply)
 935         dbus_message_unref(reply);
 936
 937     if (dbus_error_is_set(&error)) {
 938         avahi_client_set_dbus_error(client, &error);
 939         dbus_error_free(&error);
 940     }
 941
 942     return client->error;
 943 }