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 = NULL, *reply = NULL;
 249     DBusError error;
 250     int32_t state;
 251     int e = AVAHI_ERR_NO_MEMORY;
 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
 262     if (!reply || dbus_error_is_set (&error))
 263         goto fail;
 264
 265     if (!(dbus_message_get_args(reply, &error, DBUS_TYPE_INT32, &state, DBUS_TYPE_INVALID)) ||
 266         dbus_error_is_set (&error))
 267         goto fail;
 268
 269     client_set_state(client, (AvahiServerState) state);
 270
 271     dbus_message_unref(message);
 272     dbus_message_unref(reply);
 273
 274     return AVAHI_OK;
 275
 276 fail:
 277     if (dbus_error_is_set(&error)) {
 278         e = avahi_error_dbus_to_number (error.name);
 279         dbus_error_free(&error);
 280     }
 281
 282     if (ret_error)
 283         *ret_error = e;
 284
 285     if (message)
 286         dbus_message_unref(message);
 287     if (reply)
 288         dbus_message_unref(reply);
 289
 290     return e;
 291 }
 292
 293 static int check_version(AvahiClient *client, int *ret_error) {
 294     DBusMessage *message = NULL, *reply  = NULL;
 295     DBusError error;
 296     char *version;
 297     int e = AVAHI_ERR_NO_MEMORY;
 298
 299     assert(client);
 300
 301     dbus_error_init(&error);
 302
 303     if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "GetVersionString")))
 304         goto fail;
 305
 306     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 307
 308     if (!reply || dbus_error_is_set (&error))
 309         goto fail;
 310
 311     if (!dbus_message_get_args (reply, &error, DBUS_TYPE_STRING, &version, DBUS_TYPE_INVALID) ||
 312         dbus_error_is_set (&error))
 313         goto fail;
 314
 315     if (strcmp(version, PACKAGE_STRING) != 0) {
 316         e = AVAHI_ERR_VERSION_MISMATCH;
 317         goto fail;
 318     }
 319
 320     dbus_message_unref(message);
 321     dbus_message_unref(reply);
 322
 323     return AVAHI_OK;
 324
 325 fail:
 326     if (dbus_error_is_set(&error)) {
 327         e = avahi_error_dbus_to_number (error.name);
 328         dbus_error_free(&error);
 329     }
 330
 331     if (ret_error)
 332         *ret_error = e;
 333
 334     if (message)
 335         dbus_message_unref(message);
 336     if (reply)
 337         dbus_message_unref(reply);
 338
 339     return e;
 340 }
 341
 342
 343 /* This function acts like dbus_bus_get but creates a private
 344  * connection instead */
 345 static DBusConnection*
 346 avahi_dbus_bus_get (DBusError *error)
 347 {
 348     DBusConnection *conn;
 349     const char *env_addr;
 350
 351     env_addr = getenv ("DBUS_SYSTEM_BUS_ADDRESS");
 352
 353     if (env_addr == NULL || (*env_addr == 0))
 354     {
 355         env_addr = DBUS_SYSTEM_BUS_DEFAULT_ADDRESS;
 356     }
 357
 358     conn = dbus_connection_open_private (env_addr, error);
 359
 360     if (!conn)
 361         return NULL;
 362
 363     dbus_connection_set_exit_on_disconnect (conn, FALSE);
 364
 365     if (!dbus_bus_register (conn, error))
 366     {
 367         dbus_connection_close (conn);
 368         dbus_connection_unref (conn);
 369
 370         return NULL;
 371     }
 372
 373     return conn;
 374 }
 375
 376 AvahiClient *avahi_client_new(const AvahiPoll *poll_api, AvahiClientCallback callback, void *userdata, int *ret_error) {
 377     AvahiClient *client = NULL;
 378     DBusError error;
 379
 380     dbus_error_init (&error);
 381
 382     if (!(client = avahi_new(AvahiClient, 1))) {
 383         if (ret_error)
 384             *ret_error = AVAHI_ERR_NO_MEMORY;
 385         goto fail;
 386     }
 387
 388     client->poll_api = poll_api;
 389     client->error = AVAHI_OK;
 390     client->callback = callback;
 391     client->userdata = userdata;
 392     client->state = AVAHI_CLIENT_DISCONNECTED;
 393
 394     client->host_name = NULL;
 395     client->host_name_fqdn = NULL;
 396     client->domain_name = NULL;
 397     client->version_string = NULL;
 398     client->local_service_cookie_valid = 0;
 399
 400     AVAHI_LLIST_HEAD_INIT(AvahiEntryGroup, client->groups);
 401     AVAHI_LLIST_HEAD_INIT(AvahiDomainBrowser, client->domain_browsers);
 402     AVAHI_LLIST_HEAD_INIT(AvahiServiceBrowser, client->service_browsers);
 403     AVAHI_LLIST_HEAD_INIT(AvahiServiceTypeBrowser, client->service_type_browsers);
 404     AVAHI_LLIST_HEAD_INIT(AvahiServiceResolver, client->service_resolvers);
 405     AVAHI_LLIST_HEAD_INIT(AvahiHostNameResolver, client->host_name_resolvers);
 406     AVAHI_LLIST_HEAD_INIT(AvahiAddressResolver, client->address_resolvers);
 407
 408     if (!(client->bus = avahi_dbus_bus_get(&error)) ||
 409         dbus_error_is_set (&error))
 410         goto fail;
 411
 412     if (avahi_dbus_connection_glue(client->bus, poll_api) < 0) {
 413         if (ret_error)
 414             *ret_error = AVAHI_ERR_NO_MEMORY; /* Not optimal */
 415         goto fail;
 416     }
 417
 418     if (!dbus_connection_add_filter (client->bus, filter_func, client, NULL)) {
 419         if (ret_error)
 420             *ret_error = AVAHI_ERR_NO_MEMORY;
 421         goto fail;
 422     }
 423
 424     dbus_bus_add_match(
 425         client->bus,
 426         "type='signal', "
 427         "interface='" AVAHI_DBUS_INTERFACE_SERVER "', "
 428         "sender='" AVAHI_DBUS_NAME "', "
 429         "path='" AVAHI_DBUS_PATH_SERVER "'",
 430         &error);
 431
 432     if (dbus_error_is_set (&error))
 433         goto fail;
 434
 435     dbus_bus_add_match (
 436         client->bus,
 437         "type='signal', "
 438         "interface='" DBUS_INTERFACE_DBUS "', "
 439         "sender='" DBUS_SERVICE_DBUS "', "
 440         "path='" DBUS_PATH_DBUS "'",
 441         &error);
 442
 443     if (dbus_error_is_set (&error))
 444         goto fail;
 445
 446         dbus_bus_add_match (
 447         client->bus,
 448         "type='signal', "
 449         "interface='" DBUS_INTERFACE_LOCAL "'",
 450         &error);
 451
 452     if (dbus_error_is_set (&error))
 453         goto fail;
 454
 455     if (!(dbus_bus_name_has_owner(client->bus, AVAHI_DBUS_NAME, &error)) ||
 456         dbus_error_is_set(&error)) {
 457
 458         /* We free the error so its not set, that way the fail target
 459          * will return the NO_DAEMON error rather than a DBUS error */
 460         dbus_error_free (&error);
 461
 462         if (ret_error)
 463             *ret_error = AVAHI_ERR_NO_DAEMON;
 464
 465         goto fail;
 466     }
 467
 468     if (check_version(client, ret_error) < 0)
 469         goto fail;
 470
 471     if (get_server_state(client, ret_error) < 0)
 472         goto fail;
 473
 474     return client;
 475
 476 fail:
 477
 478     if (client)
 479         avahi_client_free(client);
 480
 481     if (dbus_error_is_set(&error)) {
 482
 483         if (ret_error)
 484             *ret_error = avahi_error_dbus_to_number(error.name);
 485
 486         dbus_error_free(&error);
 487     }
 488
 489     return NULL;
 490 }
 491
 492 void avahi_client_free(AvahiClient *client) {
 493     assert(client);
 494
 495     while (client->groups)
 496         avahi_entry_group_free(client->groups);
 497
 498     while (client->domain_browsers)
 499         avahi_domain_browser_free(client->domain_browsers);
 500
 501     while (client->service_browsers)
 502         avahi_service_browser_free(client->service_browsers);
 503
 504     while (client->service_type_browsers)
 505         avahi_service_type_browser_free(client->service_type_browsers);
 506
 507     while (client->service_resolvers)
 508         avahi_service_resolver_free(client->service_resolvers);
 509
 510     if (client->bus) {
 511         dbus_connection_disconnect(client->bus);
 512         dbus_connection_unref(client->bus);
 513     }
 514
 515     avahi_free(client->version_string);
 516     avahi_free(client->host_name);
 517     avahi_free(client->host_name_fqdn);
 518     avahi_free(client->domain_name);
 519
 520     avahi_free(client);
 521 }
 522
 523 static char* avahi_client_get_string_reply_and_block (AvahiClient *client, const char *method, const char *param) {
 524     DBusMessage *message = NULL, *reply = NULL;
 525     DBusError error;
 526     char *ret, *n;
 527
 528     assert(client);
 529     assert(method);
 530
 531     dbus_error_init (&error);
 532
 533     if (!(message = dbus_message_new_method_call (AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, method))) {
 534         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 535         goto fail;
 536     }
 537
 538     if (param) {
 539         if (!dbus_message_append_args (message, DBUS_TYPE_STRING, &param, DBUS_TYPE_INVALID)) {
 540             avahi_client_set_errno (client, AVAHI_ERR_NO_MEMORY);
 541             goto fail;
 542         }
 543     }
 544
 545     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 546
 547     if (!reply || dbus_error_is_set (&error))
 548         goto fail;
 549
 550     if (!dbus_message_get_args (reply, &error, DBUS_TYPE_STRING, &ret, DBUS_TYPE_INVALID) ||
 551         dbus_error_is_set (&error))
 552         goto fail;
 553
 554     if (!(n = avahi_strdup(ret))) {
 555         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 556         goto fail;
 557     }
 558
 559     dbus_message_unref(message);
 560     dbus_message_unref(reply);
 561
 562     return n;
 563
 564 fail:
 565
 566     if (message)
 567         dbus_message_unref(message);
 568     if (reply)
 569         dbus_message_unref(reply);
 570
 571     if (dbus_error_is_set(&error)) {
 572         avahi_client_set_dbus_error(client, &error);
 573         dbus_error_free(&error);
 574     }
 575
 576     return NULL;
 577 }
 578
 579 const char* avahi_client_get_version_string (AvahiClient *client) {
 580     assert(client);
 581
 582     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 583         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 584         return NULL;
 585     }
 586
 587     if (!client->version_string)
 588         client->version_string = avahi_client_get_string_reply_and_block(client, "GetVersionString", NULL);
 589
 590     return client->version_string;
 591 }
 592
 593 const char* avahi_client_get_domain_name (AvahiClient *client) {
 594     assert(client);
 595
 596     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 597         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 598         return NULL;
 599     }
 600
 601     if (!client->domain_name)
 602         client->domain_name = avahi_client_get_string_reply_and_block(client, "GetDomainName", NULL);
 603
 604     return client->domain_name;
 605 }
 606
 607 const char* avahi_client_get_host_name (AvahiClient *client) {
 608     assert(client);
 609
 610     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 611         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 612         return NULL;
 613     }
 614
 615     if (!client->host_name)
 616         client->host_name = avahi_client_get_string_reply_and_block(client, "GetHostName", NULL);
 617
 618     return client->host_name;
 619 }
 620
 621 const char* avahi_client_get_host_name_fqdn (AvahiClient *client) {
 622     assert(client);
 623
 624     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 625         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 626         return NULL;
 627     }
 628
 629     if (!client->host_name_fqdn)
 630         client->host_name_fqdn = avahi_client_get_string_reply_and_block(client, "GetHostNameFqdn", NULL);
 631
 632     return client->host_name_fqdn;
 633 }
 634
 635 AvahiClientState avahi_client_get_state(AvahiClient *client) {
 636     assert(client);
 637
 638     return client->state;
 639 }
 640
 641 int avahi_client_errno(AvahiClient *client) {
 642     assert(client);
 643
 644     return client->error;
 645 }
 646
 647 /* Just for internal use */
 648 int avahi_client_simple_method_call(AvahiClient *client, const char *path, const char *interface, const char *method) {
 649     DBusMessage *message = NULL, *reply = NULL;
 650     DBusError error;
 651     int r = AVAHI_OK;
 652
 653     dbus_error_init(&error);
 654
 655     assert(client);
 656     assert(path);
 657     assert(interface);
 658     assert(method);
 659
 660     if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, path, interface, method))) {
 661         r = avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 662         goto fail;
 663     }
 664
 665     if (!(reply = dbus_connection_send_with_reply_and_block(client->bus, message, -1, &error)) ||
 666         dbus_error_is_set (&error)) {
 667         r = avahi_client_set_errno(client, AVAHI_ERR_DBUS_ERROR);
 668         goto fail;
 669     }
 670
 671     if (!dbus_message_get_args(reply, &error, DBUS_TYPE_INVALID) ||
 672         dbus_error_is_set (&error)) {
 673         r = avahi_client_set_errno(client, AVAHI_ERR_DBUS_ERROR);
 674         goto fail;
 675     }
 676
 677     dbus_message_unref(message);
 678     dbus_message_unref(reply);
 679
 680     return AVAHI_OK;
 681
 682 fail:
 683     if (dbus_error_is_set(&error)) {
 684         r = avahi_client_set_dbus_error(client, &error);
 685         dbus_error_free(&error);
 686     }
 687
 688     if (message)
 689         dbus_message_unref(message);
 690
 691     if (reply)
 692         dbus_message_unref(reply);
 693
 694     return r;
 695 }
 696
 697 uint32_t avahi_client_get_local_service_cookie(AvahiClient *client) {
 698     DBusMessage *message = NULL, *reply = NULL;
 699     DBusError error;
 700     assert(client);
 701
 702     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 703         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 704         return AVAHI_SERVICE_COOKIE_INVALID;
 705     }
 706
 707     if (client->local_service_cookie_valid)
 708         return client->local_service_cookie;
 709
 710     dbus_error_init (&error);
 711
 712     if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "GetLocalServiceCookie"))) {
 713         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 714         goto fail;
 715     }
 716
 717     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 718
 719     if (!reply || dbus_error_is_set (&error))
 720         goto fail;
 721
 722     if (!dbus_message_get_args (reply, &error, DBUS_TYPE_UINT32, &client->local_service_cookie, DBUS_TYPE_INVALID) ||
 723         dbus_error_is_set (&error))
 724         goto fail;
 725
 726     dbus_message_unref(message);
 727     dbus_message_unref(reply);
 728
 729     client->local_service_cookie_valid = 1;
 730     return client->local_service_cookie;
 731
 732 fail:
 733
 734     if (message)
 735         dbus_message_unref(message);
 736     if (reply)
 737         dbus_message_unref(reply);
 738
 739     if (dbus_error_is_set(&error)) {
 740         avahi_client_set_dbus_error(client, &error);
 741         dbus_error_free(&error);
 742     }
 743
 744     return AVAHI_SERVICE_COOKIE_INVALID;
 745 }
 746
 747 int avahi_client_is_service_local(AvahiClient *client, AvahiIfIndex interface, AvahiProtocol protocol, const char *name, const char *type, const char *domain) {
 748     DBusMessage *message = NULL, *reply = NULL;
 749     DBusError error;
 750     int32_t i_interface, i_protocol;
 751     int b;
 752
 753     assert(client);
 754     assert(name);
 755     assert(type);
 756     assert(domain);
 757
 758     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 759         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 760         return AVAHI_SERVICE_COOKIE_INVALID;
 761     }
 762
 763     dbus_error_init (&error);
 764
 765     if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "IsServiceLocal"))) {
 766         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 767         goto fail;
 768     }
 769
 770     i_interface = (int32_t) interface;
 771     i_protocol = (int32_t) protocol;
 772
 773     if (!dbus_message_append_args(
 774             message,
 775             DBUS_TYPE_INT32, &i_interface,
 776             DBUS_TYPE_INT32, &i_protocol,
 777             DBUS_TYPE_STRING, &name,
 778             DBUS_TYPE_STRING, &type,
 779             DBUS_TYPE_STRING, &domain,
 780             DBUS_TYPE_INVALID)) {
 781         avahi_client_set_errno (client, AVAHI_ERR_NO_MEMORY);
 782         goto fail;
 783     }
 784
 785     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 786
 787     if (!reply || dbus_error_is_set (&error))
 788         goto fail;
 789
 790     if (!dbus_message_get_args (reply, &error, DBUS_TYPE_BOOLEAN, &b, DBUS_TYPE_INVALID) ||
 791         dbus_error_is_set (&error))
 792         goto fail;
 793
 794     dbus_message_unref(message);
 795     dbus_message_unref(reply);
 796
 797     return b;
 798
 799 fail:
 800
 801     if (message)
 802         dbus_message_unref(message);
 803     if (reply)
 804         dbus_message_unref(reply);
 805
 806     if (dbus_error_is_set(&error)) {
 807         avahi_client_set_dbus_error(client, &error);
 808         dbus_error_free(&error);
 809     }
 810
 811     return AVAHI_SERVICE_COOKIE_INVALID;
 812 }