4 This file is part of avahi.
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.
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.
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
30 #include <dbus/dbus.h>
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>
42 int avahi_client_set_errno (AvahiClient *client, int error) {
45 return client->error = error;
48 int avahi_client_set_dbus_error(AvahiClient *client, DBusError *error) {
52 return avahi_client_set_errno(client, avahi_error_dbus_to_number(error->name));
55 static void client_set_state (AvahiClient *client, AvahiServerState state) {
58 if (client->state == state)
61 client->state = state;
63 switch (client->state) {
64 case AVAHI_CLIENT_DISCONNECTED:
66 dbus_connection_disconnect(client->bus);
67 dbus_connection_unref(client->bus);
73 case AVAHI_CLIENT_S_COLLISION:
74 case AVAHI_CLIENT_S_REGISTERING:
76 /* Clear cached strings */
77 avahi_free(client->host_name);
78 avahi_free(client->host_name_fqdn);
79 avahi_free(client->domain_name);
81 client->host_name = NULL;
82 client->host_name_fqdn = NULL;
83 client->domain_name = NULL;
86 case AVAHI_CLIENT_S_RUNNING:
92 client->callback (client, state, client->userdata);
95 static DBusHandlerResult filter_func(DBusConnection *bus, DBusMessage *message, void *userdata) {
96 AvahiClient *client = userdata;
102 dbus_error_init (&error);
104 /* fprintf(stderr, "dbus: interface=%s, path=%s, member=%s\n", */
105 /* dbus_message_get_interface (message), */
106 /* dbus_message_get_path (message), */
107 /* dbus_message_get_member (message)); */
109 if (client->state == AVAHI_CLIENT_DISCONNECTED)
112 if (dbus_message_is_signal(message, DBUS_INTERFACE_LOCAL, "Disconnected")) {
114 /* The DBUS server died or kicked us */
115 client_set_state(client, AVAHI_CLIENT_DISCONNECTED);
117 } if (dbus_message_is_signal(message, DBUS_INTERFACE_DBUS, "NameOwnerChanged")) {
118 char *name, *old, *new;
120 if (!dbus_message_get_args(
122 DBUS_TYPE_STRING, &name,
123 DBUS_TYPE_STRING, &old,
124 DBUS_TYPE_STRING, &new,
125 DBUS_TYPE_INVALID) || dbus_error_is_set (&error)) {
127 fprintf(stderr, "WARNING: Failed to parse NameOwnerChanged signal: %s\n", error.message);
131 if (strcmp(name, AVAHI_DBUS_NAME) == 0)
133 /* Regardless if the server lost or acquired its name or
134 * if the name was transfered: our services are no longer
135 * available, so we disconnect ourselves */
137 client_set_state(client, AVAHI_CLIENT_DISCONNECTED);
139 } else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_SERVER, "StateChanged")) {
144 if (!dbus_message_get_args(
146 DBUS_TYPE_INT32, &state,
147 DBUS_TYPE_STRING, &e,
148 DBUS_TYPE_INVALID) || dbus_error_is_set (&error)) {
149 fprintf(stderr, "WARNING: Failed to parse Server.StateChanged signal: %s\n", error.message);
153 if ((c = avahi_error_dbus_to_number(e)) != AVAHI_OK)
154 avahi_client_set_errno(client, c);
156 client_set_state(client, (AvahiClientState) state);
158 } else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_ENTRY_GROUP, "StateChanged")) {
161 path = dbus_message_get_path(message);
163 for (g = client->groups; g; g = g->groups_next)
164 if (strcmp(g->path, path) == 0)
172 if (!dbus_message_get_args(
174 DBUS_TYPE_INT32, &state,
175 DBUS_TYPE_STRING, &e,
176 DBUS_TYPE_INVALID) ||
177 dbus_error_is_set(&error)) {
178 fprintf(stderr, "WARNING: Failed to parse EntryGroup.StateChanged signal: %s\n", error.message);
182 if ((c = avahi_error_dbus_to_number(e)) != AVAHI_OK)
183 avahi_client_set_errno(client, c);
185 avahi_entry_group_set_state(g, state);
188 } else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "ItemNew"))
189 return avahi_domain_browser_event(client, AVAHI_BROWSER_NEW, message);
190 else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "ItemRemove"))
191 return avahi_domain_browser_event(client, AVAHI_BROWSER_REMOVE, message);
192 else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "CacheExhausted"))
193 return avahi_domain_browser_event(client, AVAHI_BROWSER_CACHE_EXHAUSTED, message);
194 else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "AllForNow"))
195 return avahi_domain_browser_event(client, AVAHI_BROWSER_ALL_FOR_NOW, message);
196 else if (dbus_message_is_signal (message, AVAHI_DBUS_INTERFACE_DOMAIN_BROWSER, "Failure"))
197 return avahi_domain_browser_event(client, AVAHI_BROWSER_FAILURE, message);
199 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "ItemNew"))
200 return avahi_service_type_browser_event (client, AVAHI_BROWSER_NEW, message);
201 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "ItemRemove"))
202 return avahi_service_type_browser_event (client, AVAHI_BROWSER_REMOVE, message);
203 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "CacheExhausted"))
204 return avahi_service_type_browser_event (client, AVAHI_BROWSER_CACHE_EXHAUSTED, message);
205 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "AllForNow"))
206 return avahi_service_type_browser_event (client, AVAHI_BROWSER_ALL_FOR_NOW, message);
207 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "Failure"))
208 return avahi_service_type_browser_event (client, AVAHI_BROWSER_FAILURE, message);
210 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "ItemNew"))
211 return avahi_service_browser_event (client, AVAHI_BROWSER_NEW, message);
212 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "ItemRemove"))
213 return avahi_service_browser_event (client, AVAHI_BROWSER_REMOVE, message);
214 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "CacheExhausted"))
215 return avahi_service_browser_event (client, AVAHI_BROWSER_CACHE_EXHAUSTED, message);
216 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "AllForNow"))
217 return avahi_service_browser_event (client, AVAHI_BROWSER_ALL_FOR_NOW, message);
218 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "Failure"))
219 return avahi_service_browser_event (client, AVAHI_BROWSER_FAILURE, message);
221 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_RESOLVER, "Found"))
222 return avahi_service_resolver_event (client, AVAHI_RESOLVER_FOUND, message);
223 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_RESOLVER, "Failure"))
224 return avahi_service_resolver_event (client, AVAHI_RESOLVER_FAILURE, message);
226 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_HOST_NAME_RESOLVER, "Found"))
227 return avahi_host_name_resolver_event (client, AVAHI_RESOLVER_FOUND, message);
228 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_HOST_NAME_RESOLVER, "Failure"))
229 return avahi_host_name_resolver_event (client, AVAHI_RESOLVER_FAILURE, message);
231 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_ADDRESS_RESOLVER, "Found"))
232 return avahi_address_resolver_event (client, AVAHI_RESOLVER_FOUND, message);
233 else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_ADDRESS_RESOLVER, "Failure"))
234 return avahi_address_resolver_event (client, AVAHI_RESOLVER_FAILURE, message);
236 return DBUS_HANDLER_RESULT_HANDLED;
240 dbus_error_free (&error);
241 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
244 static int get_server_state(AvahiClient *client, int *ret_error) {
245 DBusMessage *message = NULL, *reply = NULL;
248 int e = AVAHI_ERR_NO_MEMORY;
252 dbus_error_init(&error);
254 if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "GetState")))
257 reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
259 if (!reply || dbus_error_is_set (&error))
262 if (!dbus_message_get_args(reply, &error, DBUS_TYPE_INT32, &state, DBUS_TYPE_INVALID) ||
263 dbus_error_is_set (&error))
266 client_set_state(client, (AvahiServerState) state);
268 dbus_message_unref(message);
269 dbus_message_unref(reply);
274 if (dbus_error_is_set(&error)) {
275 e = avahi_error_dbus_to_number (error.name);
276 dbus_error_free(&error);
283 dbus_message_unref(message);
285 dbus_message_unref(reply);
290 static int check_version(AvahiClient *client, int *ret_error) {
291 DBusMessage *message = NULL, *reply = NULL;
294 int e = AVAHI_ERR_NO_MEMORY;
298 dbus_error_init(&error);
300 if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "GetVersionString")))
303 reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
305 if (!reply || dbus_error_is_set (&error))
308 if (!dbus_message_get_args (reply, &error, DBUS_TYPE_STRING, &version, DBUS_TYPE_INVALID) ||
309 dbus_error_is_set (&error))
312 if (strcmp(version, PACKAGE_STRING) != 0) {
313 e = AVAHI_ERR_VERSION_MISMATCH;
317 dbus_message_unref(message);
318 dbus_message_unref(reply);
323 if (dbus_error_is_set(&error)) {
324 e = avahi_error_dbus_to_number (error.name);
325 dbus_error_free(&error);
332 dbus_message_unref(message);
334 dbus_message_unref(reply);
340 /* This function acts like dbus_bus_get but creates a private
341 * connection instead */
342 static DBusConnection*
343 avahi_dbus_bus_get (DBusError *error)
345 DBusConnection *conn;
346 const char *env_addr;
348 env_addr = getenv ("DBUS_SYSTEM_BUS_ADDRESS");
350 if (env_addr == NULL || (*env_addr == 0))
352 env_addr = DBUS_SYSTEM_BUS_DEFAULT_ADDRESS;
355 conn = dbus_connection_open_private (env_addr, error);
360 dbus_connection_set_exit_on_disconnect (conn, FALSE);
362 if (!dbus_bus_register (conn, error))
364 dbus_connection_close (conn);
365 dbus_connection_unref (conn);
373 AvahiClient *avahi_client_new(const AvahiPoll *poll_api, AvahiClientCallback callback, void *userdata, int *ret_error) {
374 AvahiClient *client = NULL;
377 dbus_error_init (&error);
379 if (!(client = avahi_new(AvahiClient, 1))) {
381 *ret_error = AVAHI_ERR_NO_MEMORY;
385 client->poll_api = poll_api;
386 client->error = AVAHI_OK;
387 client->callback = callback;
388 client->userdata = userdata;
389 client->state = AVAHI_CLIENT_DISCONNECTED;
391 client->host_name = NULL;
392 client->host_name_fqdn = NULL;
393 client->domain_name = NULL;
394 client->version_string = NULL;
395 client->local_service_cookie_valid = 0;
397 AVAHI_LLIST_HEAD_INIT(AvahiEntryGroup, client->groups);
398 AVAHI_LLIST_HEAD_INIT(AvahiDomainBrowser, client->domain_browsers);
399 AVAHI_LLIST_HEAD_INIT(AvahiServiceBrowser, client->service_browsers);
400 AVAHI_LLIST_HEAD_INIT(AvahiServiceTypeBrowser, client->service_type_browsers);
401 AVAHI_LLIST_HEAD_INIT(AvahiServiceResolver, client->service_resolvers);
402 AVAHI_LLIST_HEAD_INIT(AvahiHostNameResolver, client->host_name_resolvers);
403 AVAHI_LLIST_HEAD_INIT(AvahiAddressResolver, client->address_resolvers);
405 if (!(client->bus = avahi_dbus_bus_get(&error)) ||
406 dbus_error_is_set (&error))
409 if (avahi_dbus_connection_glue(client->bus, poll_api) < 0) {
411 *ret_error = AVAHI_ERR_NO_MEMORY; /* Not optimal */
415 if (!dbus_connection_add_filter (client->bus, filter_func, client, NULL)) {
417 *ret_error = AVAHI_ERR_NO_MEMORY;
424 "interface='" AVAHI_DBUS_INTERFACE_SERVER "', "
425 "sender='" AVAHI_DBUS_NAME "', "
426 "path='" AVAHI_DBUS_PATH_SERVER "'",
429 if (dbus_error_is_set (&error))
435 "interface='" DBUS_INTERFACE_DBUS "', "
436 "sender='" DBUS_SERVICE_DBUS "', "
437 "path='" DBUS_PATH_DBUS "'",
440 if (dbus_error_is_set (&error))
446 "interface='" DBUS_INTERFACE_LOCAL "'",
449 if (dbus_error_is_set (&error))
452 if (!(dbus_bus_name_has_owner(client->bus, AVAHI_DBUS_NAME, &error)) ||
453 dbus_error_is_set(&error)) {
455 /* We free the error so its not set, that way the fail target
456 * will return the NO_DAEMON error rather than a DBUS error */
457 dbus_error_free (&error);
460 *ret_error = AVAHI_ERR_NO_DAEMON;
465 if (check_version(client, ret_error) < 0)
468 if (get_server_state(client, ret_error) < 0)
476 avahi_client_free(client);
478 if (dbus_error_is_set(&error)) {
481 *ret_error = avahi_error_dbus_to_number(error.name);
483 dbus_error_free(&error);
489 void avahi_client_free(AvahiClient *client) {
492 while (client->groups)
493 avahi_entry_group_free(client->groups);
495 while (client->domain_browsers)
496 avahi_domain_browser_free(client->domain_browsers);
498 while (client->service_browsers)
499 avahi_service_browser_free(client->service_browsers);
501 while (client->service_type_browsers)
502 avahi_service_type_browser_free(client->service_type_browsers);
504 while (client->service_resolvers)
505 avahi_service_resolver_free(client->service_resolvers);
508 dbus_connection_disconnect(client->bus);
509 dbus_connection_unref(client->bus);
512 avahi_free(client->version_string);
513 avahi_free(client->host_name);
514 avahi_free(client->host_name_fqdn);
515 avahi_free(client->domain_name);
520 static char* avahi_client_get_string_reply_and_block (AvahiClient *client, const char *method, const char *param) {
521 DBusMessage *message = NULL, *reply = NULL;
528 dbus_error_init (&error);
530 if (!(message = dbus_message_new_method_call (AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, method))) {
531 avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
536 if (!dbus_message_append_args (message, DBUS_TYPE_STRING, ¶m, DBUS_TYPE_INVALID)) {
537 avahi_client_set_errno (client, AVAHI_ERR_NO_MEMORY);
542 reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
544 if (!reply || dbus_error_is_set (&error))
547 if (!dbus_message_get_args (reply, &error, DBUS_TYPE_STRING, &ret, DBUS_TYPE_INVALID) ||
548 dbus_error_is_set (&error))
551 if (!(n = avahi_strdup(ret))) {
552 avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
556 dbus_message_unref(message);
557 dbus_message_unref(reply);
564 dbus_message_unref(message);
566 dbus_message_unref(reply);
568 if (dbus_error_is_set(&error)) {
569 avahi_client_set_dbus_error(client, &error);
570 dbus_error_free(&error);
576 const char* avahi_client_get_version_string (AvahiClient *client) {
579 if (client->state == AVAHI_CLIENT_DISCONNECTED) {
580 avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
584 if (!client->version_string)
585 client->version_string = avahi_client_get_string_reply_and_block(client, "GetVersionString", NULL);
587 return client->version_string;
590 const char* avahi_client_get_domain_name (AvahiClient *client) {
593 if (client->state == AVAHI_CLIENT_DISCONNECTED) {
594 avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
598 if (!client->domain_name)
599 client->domain_name = avahi_client_get_string_reply_and_block(client, "GetDomainName", NULL);
601 return client->domain_name;
604 const char* avahi_client_get_host_name (AvahiClient *client) {
607 if (client->state == AVAHI_CLIENT_DISCONNECTED) {
608 avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
612 if (!client->host_name)
613 client->host_name = avahi_client_get_string_reply_and_block(client, "GetHostName", NULL);
615 return client->host_name;
618 const char* avahi_client_get_host_name_fqdn (AvahiClient *client) {
621 if (client->state == AVAHI_CLIENT_DISCONNECTED) {
622 avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
626 if (!client->host_name_fqdn)
627 client->host_name_fqdn = avahi_client_get_string_reply_and_block(client, "GetHostNameFqdn", NULL);
629 return client->host_name_fqdn;
632 AvahiClientState avahi_client_get_state(AvahiClient *client) {
635 return client->state;
638 int avahi_client_errno(AvahiClient *client) {
641 return client->error;
644 /* Just for internal use */
645 int avahi_client_simple_method_call(AvahiClient *client, const char *path, const char *interface, const char *method) {
646 DBusMessage *message = NULL, *reply = NULL;
650 dbus_error_init(&error);
657 if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, path, interface, method))) {
658 r = avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
662 if (!(reply = dbus_connection_send_with_reply_and_block(client->bus, message, -1, &error)) ||
663 dbus_error_is_set (&error)) {
664 r = avahi_client_set_errno(client, AVAHI_ERR_DBUS_ERROR);
668 if (!dbus_message_get_args(reply, &error, DBUS_TYPE_INVALID) ||
669 dbus_error_is_set (&error)) {
670 r = avahi_client_set_errno(client, AVAHI_ERR_DBUS_ERROR);
674 dbus_message_unref(message);
675 dbus_message_unref(reply);
680 if (dbus_error_is_set(&error)) {
681 r = avahi_client_set_dbus_error(client, &error);
682 dbus_error_free(&error);
686 dbus_message_unref(message);
689 dbus_message_unref(reply);
694 uint32_t avahi_client_get_local_service_cookie(AvahiClient *client) {
695 DBusMessage *message = NULL, *reply = NULL;
699 if (client->state == AVAHI_CLIENT_DISCONNECTED) {
700 avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
701 return AVAHI_SERVICE_COOKIE_INVALID;
704 if (client->local_service_cookie_valid)
705 return client->local_service_cookie;
707 dbus_error_init (&error);
709 if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "GetLocalServiceCookie"))) {
710 avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
714 reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
716 if (!reply || dbus_error_is_set (&error))
719 if (!dbus_message_get_args (reply, &error, DBUS_TYPE_UINT32, &client->local_service_cookie, DBUS_TYPE_INVALID) ||
720 dbus_error_is_set (&error))
723 dbus_message_unref(message);
724 dbus_message_unref(reply);
726 client->local_service_cookie_valid = 1;
727 return client->local_service_cookie;
732 dbus_message_unref(message);
734 dbus_message_unref(reply);
736 if (dbus_error_is_set(&error)) {
737 avahi_client_set_dbus_error(client, &error);
738 dbus_error_free(&error);
741 return AVAHI_SERVICE_COOKIE_INVALID;