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 int avahi_client_set_errno (AvahiClient *client, int error) {
  43     assert(client);
  44
  45     return client->error = error;
  46 }
  47
  48 int avahi_client_set_dbus_error(AvahiClient *client, DBusError *error) {
  49     assert(client);
  50     assert(error);
  51
  52     return avahi_client_set_errno(client, avahi_error_dbus_to_number(error->name));
  53 }
  54
  55 static void client_set_state (AvahiClient *client, AvahiServerState state) {
  56     assert(client);
  57
  58     if (client->state == state)
  59         return;
  60
  61     client->state = state;
  62
  63     switch (client->state) {
  64         case AVAHI_CLIENT_DISCONNECTED:
  65             if (client->bus) {
  66                 dbus_connection_disconnect(client->bus);
  67                 dbus_connection_unref(client->bus);
  68                 client->bus = NULL;
  69             }
  70
  71             /* Fall through */
  72
  73         case AVAHI_CLIENT_S_COLLISION:
  74         case AVAHI_CLIENT_S_REGISTERING:
  75
  76             /* Clear cached strings */
  77             avahi_free(client->host_name);
  78             avahi_free(client->host_name_fqdn);
  79             avahi_free(client->domain_name);
  80
  81             client->host_name =  NULL;
  82             client->host_name_fqdn = NULL;
  83             client->domain_name = NULL;
  84             break;
  85
  86         case AVAHI_CLIENT_S_INVALID:
  87         case AVAHI_CLIENT_S_RUNNING:
  88             break;
  89
  90     }
  91
  92     if (client->callback)
  93         client->callback (client, state, client->userdata);
  94 }
  95
  96 static DBusHandlerResult filter_func(DBusConnection *bus, DBusMessage *message, void *userdata) {
  97     AvahiClient *client = userdata;
  98     DBusError error;
  99
 100     assert(bus);
 101     assert(message);
 102
 103     dbus_error_init (&error);
 104
 105 /*     fprintf(stderr, "dbus: interface=%s, path=%s, member=%s\n", */
 106 /*             dbus_message_get_interface (message), */
 107 /*             dbus_message_get_path (message), */
 108 /*             dbus_message_get_member (message)); */
 109
 110     if (client->state == AVAHI_CLIENT_DISCONNECTED)
 111         goto fail;
 112
 113     if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
 114
 115         /* The DBUS server died or kicked us */
 116         client_set_state(client, AVAHI_CLIENT_DISCONNECTED);
 117
 118     } if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS, "NameOwnerChanged")) {
 119         char *name, *old, *new;
 120
 121         if (!(dbus_message_get_args(
 122                   message, &error,
 123                   DBUS_TYPE_STRING, &name,
 124                   DBUS_TYPE_STRING, &old,
 125                   DBUS_TYPE_STRING, &new,
 126                   DBUS_TYPE_INVALID) || dbus_error_is_set (&error))) {
 127
 128             fprintf(stderr, "WARNING: Failed to parse NameOwnerChanged signal: %s\n", error.message);
 129             goto fail;
 130         }
 131
 132         if (strcmp(name, AVAHI_DBUS_NAME) == 0)
 133
 134             /* Regardless if the server lost or acquired its name or
 135              * if the name was transfered: our services are no longer
 136              * available, so we disconnect ourselves */
 137
 138             client_set_state(client, AVAHI_CLIENT_DISCONNECTED);
 139
 140     } else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_SERVER, "StateChanged")) {
 141         int32_t state;
 142
 143         if (!(dbus_message_get_args(
 144                   message, &error,
 145                   DBUS_TYPE_INT32, &state,
 146                   DBUS_TYPE_INVALID) || dbus_error_is_set (&error))) {
 147             fprintf(stderr, "WARNING: Failed to parse Server.StateChanged signal: %s\n", error.message);
 148             goto fail;
 149         }
 150
 151         client_set_state(client, (AvahiClientState) state);
 152
 153     } else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_ENTRY_GROUP, "StateChanged")) {
 154         const char *path;
 155         AvahiEntryGroup *g;
 156         path = dbus_message_get_path(message);
 157
 158         for (g = client->groups; g; g = g->groups_next)
 159             if (strcmp(g->path, path) == 0)
 160                 break;
 161
 162         if (g) {
 163             int32_t state;
 164             if (!(dbus_message_get_args (message, &error, DBUS_TYPE_INT32, &state, DBUS_TYPE_INVALID)) ||
 165                 dbus_error_is_set(&error)) {
 166                 fprintf(stderr, "WARNING: Failed to parse EntryGroup.StateChanged signal: %s\n", error.message);
 167                 goto fail;
 168             }
 169
 170             avahi_entry_group_set_state(g, state);
 171         }
 172
 173     } else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "ItemNew"))
 174         return avahi_domain_browser_event(client, AVAHI_BROWSER_NEW, message);
 175     else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "ItemRemove"))
 176         return avahi_domain_browser_event(client, AVAHI_BROWSER_REMOVE, message);
 177     else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "CacheExhausted"))
 178         return avahi_domain_browser_event(client, AVAHI_BROWSER_CACHE_EXHAUSTED, message);
 179     else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "AllForNow"))
 180         return avahi_domain_browser_event(client, AVAHI_BROWSER_ALL_FOR_NOW, message);
 181     else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "NotFound"))
 182         return avahi_domain_browser_event(client, AVAHI_BROWSER_NOT_FOUND, message);
 183     else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "Failure"))
 184         return avahi_domain_browser_event(client, AVAHI_BROWSER_FAILURE, message);
 185
 186     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "ItemNew"))
 187         return avahi_service_type_browser_event (client, AVAHI_BROWSER_NEW, message);
 188     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "ItemRemove"))
 189         return avahi_service_type_browser_event (client, AVAHI_BROWSER_REMOVE, message);
 190     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "CacheExhausted"))
 191         return avahi_service_type_browser_event (client, AVAHI_BROWSER_CACHE_EXHAUSTED, message);
 192     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "AllForNow"))
 193         return avahi_service_type_browser_event (client, AVAHI_BROWSER_ALL_FOR_NOW, message);
 194     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "NotFound"))
 195         return avahi_service_type_browser_event (client, AVAHI_BROWSER_NOT_FOUND, message);
 196     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "Failure"))
 197         return avahi_service_type_browser_event (client, AVAHI_BROWSER_FAILURE, message);
 198
 199     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "ItemNew"))
 200         return avahi_service_browser_event (client, AVAHI_BROWSER_NEW, message);
 201     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "ItemRemove"))
 202         return avahi_service_browser_event (client, AVAHI_BROWSER_REMOVE, message);
 203     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "CacheExhausted"))
 204         return avahi_service_browser_event (client, AVAHI_BROWSER_CACHE_EXHAUSTED, message);
 205     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "AllForNow"))
 206         return avahi_service_browser_event (client, AVAHI_BROWSER_ALL_FOR_NOW, message);
 207     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "NotFound"))
 208         return avahi_service_browser_event (client, AVAHI_BROWSER_NOT_FOUND, message);
 209     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "Failure"))
 210         return avahi_service_browser_event (client, AVAHI_BROWSER_FAILURE, message);
 211
 212     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_RESOLVER, "Found"))
 213         return avahi_service_resolver_event (client, AVAHI_RESOLVER_FOUND, message);
 214     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_RESOLVER, "Timeout"))
 215         return avahi_service_resolver_event (client, AVAHI_RESOLVER_TIMEOUT, message);
 216     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_RESOLVER, "NotFound"))
 217         return avahi_service_resolver_event (client, AVAHI_RESOLVER_NOT_FOUND, message);
 218     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_RESOLVER, "Failure"))
 219         return avahi_service_resolver_event (client, AVAHI_RESOLVER_FAILURE, message);
 220
 221     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_HOST_NAME_RESOLVER, "Found"))
 222         return avahi_host_name_resolver_event (client, AVAHI_RESOLVER_FOUND, message);
 223     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_HOST_NAME_RESOLVER, "Timeout"))
 224         return avahi_host_name_resolver_event (client, AVAHI_RESOLVER_TIMEOUT, message);
 225     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_HOST_NAME_RESOLVER, "NotFound"))
 226         return avahi_host_name_resolver_event (client, AVAHI_RESOLVER_NOT_FOUND, message);
 227     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_HOST_NAME_RESOLVER, "Failure"))
 228         return avahi_host_name_resolver_event (client, AVAHI_RESOLVER_FAILURE, message);
 229
 230     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_ADDRESS_RESOLVER, "Found"))
 231         return avahi_address_resolver_event (client, AVAHI_RESOLVER_FOUND, message);
 232     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_ADDRESS_RESOLVER, "Timeout"))
 233         return avahi_address_resolver_event (client, AVAHI_RESOLVER_TIMEOUT, message);
 234     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_ADDRESS_RESOLVER, "NotFound"))
 235         return avahi_address_resolver_event (client, AVAHI_RESOLVER_NOT_FOUND, message);
 236     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_ADDRESS_RESOLVER, "Failure"))
 237         return avahi_address_resolver_event (client, AVAHI_RESOLVER_FAILURE, message);
 238
 239     return DBUS_HANDLER_RESULT_HANDLED;
 240
 241 fail:
 242
 243     dbus_error_free (&error);
 244     return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 245 }
 246
 247 static int get_server_state(AvahiClient *client, int *ret_error) {
 248     DBusMessage *message, *reply;
 249     DBusError error;
 250     int32_t state;
 251     int e;
 252
 253     assert(client);
 254
 255     dbus_error_init(&error);
 256
 257     if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "GetState")))
 258         goto fail;
 259
 260     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 261     dbus_message_unref(message);
 262
 263     if (!reply)
 264         goto fail;
 265
 266     if (!(dbus_message_get_args(reply, &error, DBUS_TYPE_INT32, &state, DBUS_TYPE_INVALID)))
 267         goto fail;
 268
 269     client_set_state(client, (AvahiServerState) state);
 270
 271     return AVAHI_OK;
 272
 273 fail:
 274     if (dbus_error_is_set(&error)) {
 275         e = avahi_error_dbus_to_number (error.name);
 276         dbus_error_free(&error);
 277     } else
 278         e = AVAHI_ERR_NO_MEMORY;
 279
 280     if (ret_error)
 281         *ret_error = e;
 282
 283     return e;
 284 }
 285
 286 /* This function acts like dbus_bus_get but creates a private
 287  * connection instead */
 288 static DBusConnection*
 289 avahi_dbus_bus_get (DBusError *error)
 290 {
 291     DBusConnection *conn;
 292     const char *env_addr;
 293
 294     env_addr = getenv ("DBUS_SYSTEM_BUS_ADDRESS");
 295
 296     if (env_addr == NULL || (*env_addr == 0))
 297     {
 298         env_addr = DBUS_SYSTEM_BUS_DEFAULT_ADDRESS;
 299     }
 300
 301     conn = dbus_connection_open_private (env_addr, error);
 302
 303     if (!conn)
 304         return NULL;
 305
 306     dbus_connection_set_exit_on_disconnect (conn, FALSE);
 307
 308     if (!dbus_bus_register (conn, error))
 309     {
 310         dbus_connection_close (conn);
 311         dbus_connection_unref (conn);
 312
 313         return NULL;
 314     }
 315
 316     return conn;
 317 }
 318
 319 AvahiClient *avahi_client_new(const AvahiPoll *poll_api, AvahiClientCallback callback, void *userdata, int *ret_error) {
 320     AvahiClient *client = NULL;
 321     DBusError error;
 322
 323     dbus_error_init (&error);
 324
 325     if (!(client = avahi_new(AvahiClient, 1))) {
 326         if (ret_error)
 327             *ret_error = AVAHI_ERR_NO_MEMORY;
 328         goto fail;
 329     }
 330
 331     client->poll_api = poll_api;
 332     client->error = AVAHI_OK;
 333     client->callback = callback;
 334     client->userdata = userdata;
 335     client->state = AVAHI_CLIENT_DISCONNECTED;
 336
 337     client->host_name = NULL;
 338     client->host_name_fqdn = NULL;
 339     client->domain_name = NULL;
 340     client->version_string = NULL;
 341     client->local_service_cookie_valid = 0;
 342
 343     AVAHI_LLIST_HEAD_INIT(AvahiEntryGroup, client->groups);
 344     AVAHI_LLIST_HEAD_INIT(AvahiDomainBrowser, client->domain_browsers);
 345     AVAHI_LLIST_HEAD_INIT(AvahiServiceBrowser, client->service_browsers);
 346     AVAHI_LLIST_HEAD_INIT(AvahiServiceTypeBrowser, client->service_type_browsers);
 347     AVAHI_LLIST_HEAD_INIT(AvahiServiceResolver, client->service_resolvers);
 348     AVAHI_LLIST_HEAD_INIT(AvahiHostNameResolver, client->host_name_resolvers);
 349     AVAHI_LLIST_HEAD_INIT(AvahiAddressResolver, client->address_resolvers);
 350
 351     if (!(client->bus = avahi_dbus_bus_get(&error)) ||
 352         dbus_error_is_set (&error))
 353         goto fail;
 354
 355     if (avahi_dbus_connection_glue(client->bus, poll_api) < 0) {
 356         if (ret_error)
 357             *ret_error = AVAHI_ERR_NO_MEMORY; /* Not optimal */
 358         goto fail;
 359     }
 360
 361     if (!dbus_connection_add_filter (client->bus, filter_func, client, NULL)) {
 362         if (ret_error)
 363             *ret_error = AVAHI_ERR_NO_MEMORY;
 364         goto fail;
 365     }
 366
 367     dbus_bus_add_match(
 368         client->bus,
 369         "type='signal', "
 370         "interface='" AVAHI_DBUS_INTERFACE_SERVER "', "
 371         "sender='" AVAHI_DBUS_NAME "', "
 372         "path='" AVAHI_DBUS_PATH_SERVER "'",
 373         &error);
 374
 375     if (dbus_error_is_set (&error))
 376         goto fail;
 377
 378     dbus_bus_add_match (
 379         client->bus,
 380         "type='signal', "
 381         "interface='" DBUS_INTERFACE_DBUS "', "
 382         "sender='" DBUS_SERVICE_DBUS "', "
 383         "path='" DBUS_PATH_DBUS "'",
 384         &error);
 385
 386     if (dbus_error_is_set (&error))
 387         goto fail;
 388
 389         dbus_bus_add_match (
 390         client->bus,
 391         "type='signal', "
 392         "interface='" DBUS_INTERFACE_LOCAL "'",
 393         &error);
 394
 395     if (dbus_error_is_set (&error))
 396         goto fail;
 397
 398     if (!(dbus_bus_name_has_owner(client->bus, AVAHI_DBUS_NAME, &error)) ||
 399         dbus_error_is_set(&error)) {
 400
 401         /* We free the error so its not set, that way the fail target
 402          * will return the NO_DAEMON error rather than a DBUS error */
 403         dbus_error_free (&error);
 404
 405         if (ret_error)
 406             *ret_error = AVAHI_ERR_NO_DAEMON;
 407
 408         goto fail;
 409     }
 410
 411     if (get_server_state(client, ret_error) < 0)
 412         goto fail;
 413
 414     return client;
 415
 416 fail:
 417
 418     if (client)
 419         avahi_client_free(client);
 420
 421     if (dbus_error_is_set(&error)) {
 422
 423         if (ret_error)
 424             *ret_error = avahi_error_dbus_to_number(error.name);
 425
 426         dbus_error_free(&error);
 427     }
 428
 429     return NULL;
 430 }
 431
 432 void avahi_client_free(AvahiClient *client) {
 433     assert(client);
 434
 435     while (client->groups)
 436         avahi_entry_group_free(client->groups);
 437
 438     while (client->domain_browsers)
 439         avahi_domain_browser_free(client->domain_browsers);
 440
 441     while (client->service_browsers)
 442         avahi_service_browser_free(client->service_browsers);
 443
 444     while (client->service_type_browsers)
 445         avahi_service_type_browser_free(client->service_type_browsers);
 446
 447     while (client->service_resolvers)
 448         avahi_service_resolver_free(client->service_resolvers);
 449
 450     if (client->bus) {
 451         dbus_connection_disconnect(client->bus);
 452         dbus_connection_unref(client->bus);
 453     }
 454
 455     avahi_free(client->version_string);
 456     avahi_free(client->host_name);
 457     avahi_free(client->host_name_fqdn);
 458     avahi_free(client->domain_name);
 459
 460     avahi_free(client);
 461 }
 462
 463 static char* avahi_client_get_string_reply_and_block (AvahiClient *client, const char *method, const char *param) {
 464     DBusMessage *message = NULL, *reply = NULL;
 465     DBusError error;
 466     char *ret, *n;
 467
 468     assert(client);
 469     assert(method);
 470
 471     dbus_error_init (&error);
 472
 473     if (!(message = dbus_message_new_method_call (AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, method))) {
 474         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 475         goto fail;
 476     }
 477
 478     if (param) {
 479         if (!dbus_message_append_args (message, DBUS_TYPE_STRING, &param, DBUS_TYPE_INVALID)) {
 480             avahi_client_set_errno (client, AVAHI_ERR_NO_MEMORY);
 481             goto fail;
 482         }
 483     }
 484
 485     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 486
 487     if (!reply || dbus_error_is_set (&error))
 488         goto fail;
 489
 490     if (!dbus_message_get_args (reply, &error, DBUS_TYPE_STRING, &ret, DBUS_TYPE_INVALID) ||
 491         dbus_error_is_set (&error))
 492         goto fail;
 493
 494     if (!(n = avahi_strdup(ret))) {
 495         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 496         goto fail;
 497     }
 498
 499     dbus_message_unref(message);
 500     dbus_message_unref(reply);
 501
 502     return n;
 503
 504 fail:
 505
 506     if (message)
 507         dbus_message_unref(message);
 508     if (reply)
 509         dbus_message_unref(reply);
 510
 511     if (dbus_error_is_set(&error)) {
 512         avahi_client_set_dbus_error(client, &error);
 513         dbus_error_free(&error);
 514     }
 515
 516     return NULL;
 517 }
 518
 519 const char* avahi_client_get_version_string (AvahiClient *client) {
 520     assert(client);
 521
 522     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 523         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 524         return NULL;
 525     }
 526
 527     if (!client->version_string)
 528         client->version_string = avahi_client_get_string_reply_and_block(client, "GetVersionString", NULL);
 529
 530     return client->version_string;
 531 }
 532
 533 const char* avahi_client_get_domain_name (AvahiClient *client) {
 534     assert(client);
 535
 536     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 537         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 538         return NULL;
 539     }
 540
 541     if (!client->domain_name)
 542         client->domain_name = avahi_client_get_string_reply_and_block(client, "GetDomainName", NULL);
 543
 544     return client->domain_name;
 545 }
 546
 547 const char* avahi_client_get_host_name (AvahiClient *client) {
 548     assert(client);
 549
 550     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 551         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 552         return NULL;
 553     }
 554
 555     if (!client->host_name)
 556         client->host_name = avahi_client_get_string_reply_and_block(client, "GetHostName", NULL);
 557
 558     return client->host_name;
 559 }
 560
 561 const char* avahi_client_get_host_name_fqdn (AvahiClient *client) {
 562     assert(client);
 563
 564     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 565         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 566         return NULL;
 567     }
 568
 569     if (!client->host_name_fqdn)
 570         client->host_name_fqdn = avahi_client_get_string_reply_and_block(client, "GetHostNameFqdn", NULL);
 571
 572     return client->host_name_fqdn;
 573 }
 574
 575 AvahiClientState avahi_client_get_state(AvahiClient *client) {
 576     assert(client);
 577
 578     return client->state;
 579 }
 580
 581 int avahi_client_errno(AvahiClient *client) {
 582     assert(client);
 583
 584     return client->error;
 585 }
 586
 587 /* Just for internal use */
 588 int avahi_client_simple_method_call(AvahiClient *client, const char *path, const char *interface, const char *method) {
 589     DBusMessage *message = NULL, *reply = NULL;
 590     DBusError error;
 591     int r = AVAHI_OK;
 592
 593     dbus_error_init(&error);
 594
 595     assert(client);
 596     assert(path);
 597     assert(interface);
 598     assert(method);
 599
 600     if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, path, interface, method))) {
 601         r = avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 602         goto fail;
 603     }
 604
 605     if (!(reply = dbus_connection_send_with_reply_and_block(client->bus, message, -1, &error)) ||
 606         dbus_error_is_set (&error)) {
 607         r = avahi_client_set_errno(client, AVAHI_ERR_DBUS_ERROR);
 608         goto fail;
 609     }
 610
 611     if (!dbus_message_get_args(reply, &error, DBUS_TYPE_INVALID) ||
 612         dbus_error_is_set (&error)) {
 613         r = avahi_client_set_errno(client, AVAHI_ERR_DBUS_ERROR);
 614         goto fail;
 615     }
 616
 617     dbus_message_unref(message);
 618     dbus_message_unref(reply);
 619
 620     return AVAHI_OK;
 621
 622 fail:
 623     if (dbus_error_is_set(&error)) {
 624         r = avahi_client_set_dbus_error(client, &error);
 625         dbus_error_free(&error);
 626     }
 627
 628     if (message)
 629         dbus_message_unref(message);
 630
 631     if (reply)
 632         dbus_message_unref(reply);
 633
 634     return r;
 635 }
 636
 637 uint32_t avahi_client_get_local_service_cookie(AvahiClient *client) {
 638     DBusMessage *message = NULL, *reply = NULL;
 639     DBusError error;
 640     assert(client);
 641
 642     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 643         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 644         return AVAHI_SERVICE_COOKIE_INVALID;
 645     }
 646
 647     if (client->local_service_cookie_valid)
 648         return client->local_service_cookie;
 649
 650     dbus_error_init (&error);
 651
 652     if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "GetLocalServiceCookie"))) {
 653         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 654         goto fail;
 655     }
 656
 657     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 658
 659     if (!reply || dbus_error_is_set (&error))
 660         goto fail;
 661
 662     if (!dbus_message_get_args (reply, &error, DBUS_TYPE_UINT32, &client->local_service_cookie, DBUS_TYPE_INVALID) ||
 663         dbus_error_is_set (&error))
 664         goto fail;
 665
 666     dbus_message_unref(message);
 667     dbus_message_unref(reply);
 668
 669     client->local_service_cookie_valid = 1;
 670     return client->local_service_cookie;
 671
 672 fail:
 673
 674     if (message)
 675         dbus_message_unref(message);
 676     if (reply)
 677         dbus_message_unref(reply);
 678
 679     if (dbus_error_is_set(&error)) {
 680         avahi_client_set_dbus_error(client, &error);
 681         dbus_error_free(&error);
 682     }
 683
 684     return AVAHI_SERVICE_COOKIE_INVALID;
 685 }
 686
 687 int avahi_client_is_service_local(AvahiClient *client, AvahiIfIndex interface, AvahiProtocol protocol, const char *name, const char *type, const char *domain) {
 688     DBusMessage *message = NULL, *reply = NULL;
 689     DBusError error;
 690     int32_t i_interface, i_protocol;
 691     int b;
 692
 693     assert(client);
 694     assert(name);
 695     assert(type);
 696     assert(domain);
 697
 698     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 699         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 700         return AVAHI_SERVICE_COOKIE_INVALID;
 701     }
 702
 703     dbus_error_init (&error);
 704
 705     if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "IsServiceLocal"))) {
 706         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 707         goto fail;
 708     }
 709
 710     i_interface = (int32_t) interface;
 711     i_protocol = (int32_t) protocol;
 712
 713     if (!dbus_message_append_args(
 714             message,
 715             DBUS_TYPE_INT32, &i_interface,
 716             DBUS_TYPE_INT32, &i_protocol,
 717             DBUS_TYPE_STRING, &name,
 718             DBUS_TYPE_STRING, &type,
 719             DBUS_TYPE_STRING, &domain,
 720             DBUS_TYPE_INVALID)) {
 721         avahi_client_set_errno (client, AVAHI_ERR_NO_MEMORY);
 722         goto fail;
 723     }
 724
 725     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 726
 727     if (!reply || dbus_error_is_set (&error))
 728         goto fail;
 729
 730     if (!dbus_message_get_args (reply, &error, DBUS_TYPE_BOOLEAN, &b, DBUS_TYPE_INVALID) ||
 731         dbus_error_is_set (&error))
 732         goto fail;
 733
 734     dbus_message_unref(message);
 735     dbus_message_unref(reply);
 736
 737     return b;
 738
 739 fail:
 740
 741     if (message)
 742         dbus_message_unref(message);
 743     if (reply)
 744         dbus_message_unref(reply);
 745
 746     if (dbus_error_is_set(&error)) {
 747         avahi_client_set_dbus_error(client, &error);
 748         dbus_error_free(&error);
 749     }
 750
 751     return AVAHI_SERVICE_COOKIE_INVALID;
 752 }