git.meshlink.io Git - catta/blob - avahi-client/client.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 <stdlib.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29
  30 #include <dbus/dbus.h>
  31
  32 #include <avahi-common/dbus.h>
  33 #include <avahi-common/llist.h>
  34 #include <avahi-common/error.h>
  35 #include <avahi-common/dbus.h>
  36 #include <avahi-common/malloc.h>
  37 #include <avahi-common/dbus-watch-glue.h>
  38
  39 #include "client.h"
  40 #include "internal.h"
  41
  42 #define AVAHI_CLIENT_DBUS_API_SUPPORTED ((uint32_t) 0x0201)
  43
  44 static int init_server(AvahiClient *client, int *ret_error);
  45
  46 int avahi_client_set_errno (AvahiClient *client, int error) {
  47     assert(client);
  48
  49     return client->error = error;
  50 }
  51
  52 int avahi_client_set_dbus_error(AvahiClient *client, DBusError *error) {
  53     assert(client);
  54     assert(error);
  55
  56     return avahi_client_set_errno(client, avahi_error_dbus_to_number(error->name));
  57 }
  58
  59 static void client_set_state (AvahiClient *client, AvahiServerState state) {
  60     assert(client);
  61
  62     if (client->state == state)
  63         return;
  64
  65     client->state = state;
  66
  67     switch (client->state) {
  68         case AVAHI_CLIENT_FAILURE:
  69             if (client->bus) {
  70 #if (DBUS_VERSION_MAJOR == 0) && (DBUS_VERSION_MINOR >= 62)
  71                 dbus_connection_close(client->bus);
  72 #else
  73                 dbus_connection_disconnect(client->bus);
  74 #endif
  75                 dbus_connection_unref(client->bus);
  76                 client->bus = NULL;
  77             }
  78
  79             /* Fall through */
  80
  81         case AVAHI_CLIENT_S_COLLISION:
  82         case AVAHI_CLIENT_S_REGISTERING:
  83
  84             /* Clear cached strings */
  85             avahi_free(client->host_name);
  86             avahi_free(client->host_name_fqdn);
  87             avahi_free(client->domain_name);
  88
  89             client->host_name =  NULL;
  90             client->host_name_fqdn = NULL;
  91             client->domain_name = NULL;
  92             break;
  93
  94         case AVAHI_CLIENT_S_RUNNING:
  95         case AVAHI_CLIENT_CONNECTING:
  96             break;
  97
  98     }
  99
 100     if (client->callback)
 101         client->callback (client, state, client->userdata);
 102 }
 103
 104 static DBusHandlerResult filter_func(DBusConnection *bus, DBusMessage *message, void *userdata) {
 105     AvahiClient *client = userdata;
 106     DBusError error;
 107
 108     assert(bus);
 109     assert(message);
 110
 111     dbus_error_init(&error);
 112
 113 /*     fprintf(stderr, "dbus: interface=%s, path=%s, member=%s\n", */
 114 /*             dbus_message_get_interface (message), */
 115 /*             dbus_message_get_path (message), */
 116 /*             dbus_message_get_member (message)); */
 117
 118     if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
 119
 120         /* The DBUS server died or kicked us */
 121         avahi_client_set_errno(client, AVAHI_ERR_DISCONNECTED);
 122         goto fail;
 123
 124     } else if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS, "NameAcquired")) {
 125
 126         /* Ignore this message */
 127
 128     } else if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS, "NameOwnerChanged")) {
 129         char *name, *old, *new;
 130
 131         if (!dbus_message_get_args(
 132                   message, &error,
 133                   DBUS_TYPE_STRING, &name,
 134                   DBUS_TYPE_STRING, &old,
 135                   DBUS_TYPE_STRING, &new,
 136                   DBUS_TYPE_INVALID) || dbus_error_is_set(&error)) {
 137
 138             fprintf(stderr, "WARNING: Failed to parse NameOwnerChanged signal: %s\n", error.message);
 139             avahi_client_set_errno(client, AVAHI_ERR_DBUS_ERROR);
 140             goto fail;
 141         }
 142
 143         if (strcmp(name, AVAHI_DBUS_NAME) == 0) {
 144
 145             if (avahi_client_is_connected(client)) {
 146
 147                 /* Regardless if the server lost or acquired 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, (AvahiServerState) 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. Eventually this should be replaced by a DBUS
 445  * provided version. */
 446 static DBusConnection* avahi_dbus_bus_get(DBusError *error) {
 447     DBusConnection *c;
 448     const char *a;
 449
 450     if (!(a = getenv("DBUS_SYSTEM_BUS_ADDRESS")) || !*a)
 451         a = DBUS_SYSTEM_BUS_DEFAULT_ADDRESS;
 452
 453     if (!(c = dbus_connection_open_private(a, error)))
 454         return NULL;
 455
 456     dbus_connection_set_exit_on_disconnect(c, FALSE);
 457
 458     if (!dbus_bus_register(c, error)) {
 459         dbus_connection_close(c);
 460         dbus_connection_unref(c);
 461         return NULL;
 462     }
 463
 464     return c;
 465 }
 466
 467 AvahiClient *avahi_client_new(const AvahiPoll *poll_api, AvahiClientFlags flags, AvahiClientCallback callback, void *userdata, int *ret_error) {
 468     AvahiClient *client = NULL;
 469     DBusError error;
 470
 471     dbus_error_init(&error);
 472
 473     if (!(client = avahi_new(AvahiClient, 1))) {
 474         if (ret_error)
 475             *ret_error = AVAHI_ERR_NO_MEMORY;
 476         goto fail;
 477     }
 478
 479     client->poll_api = poll_api;
 480     client->error = AVAHI_OK;
 481     client->callback = callback;
 482     client->userdata = userdata;
 483     client->state = (AvahiClientState) -1;
 484     client->flags = flags;
 485
 486     client->host_name = NULL;
 487     client->host_name_fqdn = NULL;
 488     client->domain_name = NULL;
 489     client->version_string = NULL;
 490     client->local_service_cookie_valid = 0;
 491
 492     AVAHI_LLIST_HEAD_INIT(AvahiEntryGroup, client->groups);
 493     AVAHI_LLIST_HEAD_INIT(AvahiDomainBrowser, client->domain_browsers);
 494     AVAHI_LLIST_HEAD_INIT(AvahiServiceBrowser, client->service_browsers);
 495     AVAHI_LLIST_HEAD_INIT(AvahiServiceTypeBrowser, client->service_type_browsers);
 496     AVAHI_LLIST_HEAD_INIT(AvahiServiceResolver, client->service_resolvers);
 497     AVAHI_LLIST_HEAD_INIT(AvahiHostNameResolver, client->host_name_resolvers);
 498     AVAHI_LLIST_HEAD_INIT(AvahiAddressResolver, client->address_resolvers);
 499     AVAHI_LLIST_HEAD_INIT(AvahiRecordBrowser, client->record_browsers);
 500
 501     if (!(client->bus = avahi_dbus_bus_get(&error)) || dbus_error_is_set(&error)) {
 502         if (ret_error)
 503             *ret_error = AVAHI_ERR_DBUS_ERROR;
 504         goto fail;
 505     }
 506
 507     if (avahi_dbus_connection_glue(client->bus, poll_api) < 0) {
 508         if (ret_error)
 509             *ret_error = AVAHI_ERR_NO_MEMORY; /* Not optimal */
 510         goto fail;
 511     }
 512
 513     if (!dbus_connection_add_filter (client->bus, filter_func, client, NULL)) {
 514         if (ret_error)
 515             *ret_error = AVAHI_ERR_NO_MEMORY;
 516         goto fail;
 517     }
 518
 519     dbus_bus_add_match(
 520         client->bus,
 521         "type='signal', "
 522         "interface='" AVAHI_DBUS_INTERFACE_SERVER "', "
 523         "sender='" AVAHI_DBUS_NAME "', "
 524         "path='" AVAHI_DBUS_PATH_SERVER "'",
 525         &error);
 526
 527     if (dbus_error_is_set(&error))
 528         goto fail;
 529
 530     dbus_bus_add_match (
 531         client->bus,
 532         "type='signal', "
 533         "interface='" DBUS_INTERFACE_DBUS "', "
 534         "sender='" DBUS_SERVICE_DBUS "', "
 535         "path='" DBUS_PATH_DBUS "'",
 536         &error);
 537
 538     if (dbus_error_is_set(&error))
 539         goto fail;
 540
 541     dbus_bus_add_match (
 542         client->bus,
 543         "type='signal', "
 544         "interface='" DBUS_INTERFACE_LOCAL "'",
 545         &error);
 546
 547     if (dbus_error_is_set(&error))
 548         goto fail;
 549
 550
 551     if (!(dbus_bus_name_has_owner(client->bus, AVAHI_DBUS_NAME, &error)) ||
 552         dbus_error_is_set(&error)) {
 553
 554         /* We free the error so its not set, that way the fail target
 555          * will return the NO_DAEMON error rather than a DBUS error */
 556         dbus_error_free(&error);
 557
 558         if (!(flags & AVAHI_CLIENT_NO_FAIL)) {
 559
 560             if (ret_error)
 561                 *ret_error = AVAHI_ERR_NO_DAEMON;
 562
 563             goto fail;
 564         }
 565
 566         /* The user doesn't want this call to fail if the daemon is not
 567          * available, so let's return succesfully */
 568         client_set_state(client, AVAHI_CLIENT_CONNECTING);
 569
 570     } else {
 571
 572         if (init_server(client, ret_error) < 0)
 573             goto fail;
 574     }
 575
 576     return client;
 577
 578 fail:
 579
 580     if (client)
 581         avahi_client_free(client);
 582
 583     if (dbus_error_is_set(&error)) {
 584
 585         if (ret_error) {
 586             if (strcmp(error.name, DBUS_ERROR_FILE_NOT_FOUND) == 0)
 587                 /* DBUS returns this error when the DBUS daemon is not running */
 588                 *ret_error = AVAHI_ERR_NO_DAEMON;
 589             else
 590                 *ret_error = avahi_error_dbus_to_number(error.name);
 591         }
 592
 593         dbus_error_free(&error);
 594     }
 595
 596     return NULL;
 597 }
 598
 599 void avahi_client_free(AvahiClient *client) {
 600     assert(client);
 601
 602     if (client->bus)
 603         /* Disconnect in advance, so that the free() functions won't
 604          * issue needless server calls */
 605 #if (DBUS_VERSION_MAJOR == 0) && (DBUS_VERSION_MINOR >= 62)
 606         dbus_connection_close(client->bus);
 607 #else
 608         dbus_connection_disconnect(client->bus);
 609 #endif
 610
 611     while (client->groups)
 612         avahi_entry_group_free(client->groups);
 613
 614     while (client->domain_browsers)
 615         avahi_domain_browser_free(client->domain_browsers);
 616
 617     while (client->service_browsers)
 618         avahi_service_browser_free(client->service_browsers);
 619
 620     while (client->service_type_browsers)
 621         avahi_service_type_browser_free(client->service_type_browsers);
 622
 623     while (client->service_resolvers)
 624         avahi_service_resolver_free(client->service_resolvers);
 625
 626     while (client->host_name_resolvers)
 627         avahi_host_name_resolver_free(client->host_name_resolvers);
 628
 629     while (client->address_resolvers)
 630         avahi_address_resolver_free(client->address_resolvers);
 631
 632     while (client->record_browsers)
 633         avahi_record_browser_free(client->record_browsers);
 634
 635     if (client->bus)
 636         dbus_connection_unref(client->bus);
 637
 638     avahi_free(client->version_string);
 639     avahi_free(client->host_name);
 640     avahi_free(client->host_name_fqdn);
 641     avahi_free(client->domain_name);
 642
 643     avahi_free(client);
 644 }
 645
 646 static char* avahi_client_get_string_reply_and_block (AvahiClient *client, const char *method, const char *param) {
 647     DBusMessage *message = NULL, *reply = NULL;
 648     DBusError error;
 649     char *ret, *n;
 650
 651     assert(client);
 652     assert(method);
 653
 654     dbus_error_init (&error);
 655
 656     if (!(message = dbus_message_new_method_call (AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, method))) {
 657         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 658         goto fail;
 659     }
 660
 661     if (param) {
 662         if (!dbus_message_append_args (message, DBUS_TYPE_STRING, &param, DBUS_TYPE_INVALID)) {
 663             avahi_client_set_errno (client, AVAHI_ERR_NO_MEMORY);
 664             goto fail;
 665         }
 666     }
 667
 668     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 669
 670     if (!reply || dbus_error_is_set (&error))
 671         goto fail;
 672
 673     if (!dbus_message_get_args (reply, &error, DBUS_TYPE_STRING, &ret, DBUS_TYPE_INVALID) ||
 674         dbus_error_is_set (&error))
 675         goto fail;
 676
 677     if (!(n = avahi_strdup(ret))) {
 678         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 679         goto fail;
 680     }
 681
 682     dbus_message_unref(message);
 683     dbus_message_unref(reply);
 684
 685     return n;
 686
 687 fail:
 688
 689     if (message)
 690         dbus_message_unref(message);
 691     if (reply)
 692         dbus_message_unref(reply);
 693
 694     if (dbus_error_is_set(&error)) {
 695         avahi_client_set_dbus_error(client, &error);
 696         dbus_error_free(&error);
 697     }
 698
 699     return NULL;
 700 }
 701
 702 const char* avahi_client_get_version_string(AvahiClient *client) {
 703     assert(client);
 704
 705     if (!avahi_client_is_connected(client)) {
 706         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 707         return NULL;
 708     }
 709
 710     if (!client->version_string)
 711         client->version_string = avahi_client_get_string_reply_and_block(client, "GetVersionString", NULL);
 712
 713     return client->version_string;
 714 }
 715
 716 const char* avahi_client_get_domain_name(AvahiClient *client) {
 717     assert(client);
 718
 719     if (!avahi_client_is_connected(client)) {
 720         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 721         return NULL;
 722     }
 723
 724     if (!client->domain_name)
 725         client->domain_name = avahi_client_get_string_reply_and_block(client, "GetDomainName", NULL);
 726
 727     return client->domain_name;
 728 }
 729
 730 const char* avahi_client_get_host_name(AvahiClient *client) {
 731     assert(client);
 732
 733     if (!avahi_client_is_connected(client)) {
 734         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 735         return NULL;
 736     }
 737
 738     if (!client->host_name)
 739         client->host_name = avahi_client_get_string_reply_and_block(client, "GetHostName", NULL);
 740
 741     return client->host_name;
 742 }
 743
 744 const char* avahi_client_get_host_name_fqdn (AvahiClient *client) {
 745     assert(client);
 746
 747     if (!avahi_client_is_connected(client)) {
 748         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 749         return NULL;
 750     }
 751
 752     if (!client->host_name_fqdn)
 753         client->host_name_fqdn = avahi_client_get_string_reply_and_block(client, "GetHostNameFqdn", NULL);
 754
 755     return client->host_name_fqdn;
 756 }
 757
 758 AvahiClientState avahi_client_get_state(AvahiClient *client) {
 759     assert(client);
 760
 761     return client->state;
 762 }
 763
 764 int avahi_client_errno(AvahiClient *client) {
 765     assert(client);
 766
 767     return client->error;
 768 }
 769
 770 /* Just for internal use */
 771 int avahi_client_simple_method_call(AvahiClient *client, const char *path, const char *interface, const char *method) {
 772     DBusMessage *message = NULL, *reply = NULL;
 773     DBusError error;
 774     int r = AVAHI_OK;
 775
 776     dbus_error_init(&error);
 777
 778     assert(client);
 779     assert(path);
 780     assert(interface);
 781     assert(method);
 782
 783     if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, path, interface, method))) {
 784         r = avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 785         goto fail;
 786     }
 787
 788     if (!(reply = dbus_connection_send_with_reply_and_block(client->bus, message, -1, &error)) ||
 789         dbus_error_is_set (&error)) {
 790         r = avahi_client_set_errno(client, AVAHI_ERR_DBUS_ERROR);
 791         goto fail;
 792     }
 793
 794     if (!dbus_message_get_args(reply, &error, DBUS_TYPE_INVALID) ||
 795         dbus_error_is_set (&error)) {
 796         r = avahi_client_set_errno(client, AVAHI_ERR_DBUS_ERROR);
 797         goto fail;
 798     }
 799
 800     dbus_message_unref(message);
 801     dbus_message_unref(reply);
 802
 803     return AVAHI_OK;
 804
 805 fail:
 806     if (dbus_error_is_set(&error)) {
 807         r = avahi_client_set_dbus_error(client, &error);
 808         dbus_error_free(&error);
 809     }
 810
 811     if (message)
 812         dbus_message_unref(message);
 813
 814     if (reply)
 815         dbus_message_unref(reply);
 816
 817     return r;
 818 }
 819
 820 uint32_t avahi_client_get_local_service_cookie(AvahiClient *client) {
 821     DBusMessage *message = NULL, *reply = NULL;
 822     DBusError error;
 823     assert(client);
 824
 825     if (!avahi_client_is_connected(client)) {
 826         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 827         return AVAHI_SERVICE_COOKIE_INVALID;
 828     }
 829
 830     if (client->local_service_cookie_valid)
 831         return client->local_service_cookie;
 832
 833     dbus_error_init (&error);
 834
 835     if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "GetLocalServiceCookie"))) {
 836         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 837         goto fail;
 838     }
 839
 840     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 841
 842     if (!reply || dbus_error_is_set (&error))
 843         goto fail;
 844
 845     if (!dbus_message_get_args (reply, &error, DBUS_TYPE_UINT32, &client->local_service_cookie, DBUS_TYPE_INVALID) ||
 846         dbus_error_is_set (&error))
 847         goto fail;
 848
 849     dbus_message_unref(message);
 850     dbus_message_unref(reply);
 851
 852     client->local_service_cookie_valid = 1;
 853     return client->local_service_cookie;
 854
 855 fail:
 856
 857     if (message)
 858         dbus_message_unref(message);
 859     if (reply)
 860         dbus_message_unref(reply);
 861
 862     if (dbus_error_is_set(&error)) {
 863         avahi_client_set_dbus_error(client, &error);
 864         dbus_error_free(&error);
 865     }
 866
 867     return AVAHI_SERVICE_COOKIE_INVALID;
 868 }
 869
 870 int avahi_client_is_connected(AvahiClient *client) {
 871     assert(client);
 872
 873     return
 874         client->bus &&
 875         dbus_connection_get_is_connected(client->bus) &&
 876         (client->state == AVAHI_CLIENT_S_RUNNING || client->state == AVAHI_CLIENT_S_REGISTERING || client->state == AVAHI_CLIENT_S_COLLISION);
 877 }
 878
 879 int avahi_client_set_host_name(AvahiClient* client, const char *name) {
 880     DBusMessage *message = NULL, *reply = NULL;
 881     DBusError error;
 882
 883     assert(client);
 884
 885     if (!avahi_client_is_connected(client))
 886         return avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 887
 888     dbus_error_init (&error);
 889
 890     if (!(message = dbus_message_new_method_call (AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "SetHostName"))) {
 891         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 892         goto fail;
 893     }
 894
 895     if (!dbus_message_append_args (message, DBUS_TYPE_STRING, &name, DBUS_TYPE_INVALID)) {
 896         avahi_client_set_errno (client, AVAHI_ERR_NO_MEMORY);
 897         goto fail;
 898     }
 899
 900     reply = dbus_connection_send_with_reply_and_block(client->bus, message, -1, &error);
 901
 902     if (!reply || dbus_error_is_set (&error))
 903         goto fail;
 904
 905     if (!dbus_message_get_args(reply, &error, DBUS_TYPE_INVALID) ||
 906         dbus_error_is_set (&error))
 907         goto fail;
 908
 909     dbus_message_unref(message);
 910     dbus_message_unref(reply);
 911
 912     avahi_free(client->host_name);
 913     client->host_name = NULL;
 914     avahi_free(client->host_name_fqdn);
 915     client->host_name_fqdn = NULL;
 916
 917     return 0;
 918
 919 fail:
 920
 921     if (message)
 922         dbus_message_unref(message);
 923     if (reply)
 924         dbus_message_unref(reply);
 925
 926     if (dbus_error_is_set(&error)) {
 927         avahi_client_set_dbus_error(client, &error);
 928         dbus_error_free(&error);
 929     }
 930
 931     return client->error;
 932 }