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
 178     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "ItemNew"))
 179         return avahi_service_type_browser_event (client, AVAHI_BROWSER_NEW, message);
 180     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_TYPE_BROWSER, "ItemRemove"))
 181         return avahi_service_type_browser_event (client, AVAHI_BROWSER_REMOVE, message);
 182
 183     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "ItemNew"))
 184         return avahi_service_browser_event (client, AVAHI_BROWSER_NEW, message);
 185     else if (dbus_message_is_signal(message, AVAHI_DBUS_INTERFACE_SERVICE_BROWSER, "ItemRemove"))
 186         return avahi_service_browser_event (client, AVAHI_BROWSER_REMOVE, message);
 187
 188     return DBUS_HANDLER_RESULT_HANDLED;
 189
 190 fail:
 191
 192     dbus_error_free (&error);
 193     return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 194 }
 195
 196 static int get_server_state(AvahiClient *client, int *ret_error) {
 197     DBusMessage *message, *reply;
 198     DBusError error;
 199     int32_t state;
 200     int e;
 201
 202     assert(client);
 203
 204     dbus_error_init(&error);
 205
 206     if (!(message = dbus_message_new_method_call(AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, "GetState")))
 207         goto fail;
 208
 209     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 210     dbus_message_unref(message);
 211
 212     if (!reply)
 213         goto fail;
 214
 215     if (!(dbus_message_get_args(reply, &error, DBUS_TYPE_INT32, &state, DBUS_TYPE_INVALID)))
 216         goto fail;
 217
 218     client_set_state(client, (AvahiServerState) state);
 219
 220     return AVAHI_OK;
 221
 222 fail:
 223     if (dbus_error_is_set(&error)) {
 224         e = avahi_error_dbus_to_number (error.name);
 225         dbus_error_free(&error);
 226     } else
 227         e = AVAHI_ERR_NO_MEMORY;
 228
 229     if (ret_error)
 230         *ret_error = e;
 231
 232     return e;
 233 }
 234
 235 AvahiClient *avahi_client_new(const AvahiPoll *poll_api, AvahiClientCallback callback, void *userdata, int *ret_error) {
 236     AvahiClient *client = NULL;
 237     DBusError error;
 238
 239     dbus_error_init (&error);
 240
 241     if (!(client = avahi_new(AvahiClient, 1))) {
 242         if (ret_error)
 243             *ret_error = AVAHI_ERR_NO_MEMORY;
 244         goto fail;
 245     }
 246
 247     client->poll_api = poll_api;
 248     client->error = AVAHI_OK;
 249     client->callback = callback;
 250     client->userdata = userdata;
 251     client->state = AVAHI_CLIENT_DISCONNECTED;
 252
 253     client->host_name = NULL;
 254     client->host_name_fqdn = NULL;
 255     client->domain_name = NULL;
 256     client->version_string = NULL;
 257
 258     AVAHI_LLIST_HEAD_INIT(AvahiEntryGroup, client->groups);
 259     AVAHI_LLIST_HEAD_INIT(AvahiDomainBrowser, client->domain_browsers);
 260     AVAHI_LLIST_HEAD_INIT(AvahiServiceBrowser, client->service_browsers);
 261     AVAHI_LLIST_HEAD_INIT(AvahiServiceTypeBrowser, client->service_type_browsers);
 262
 263     if (!(client->bus = dbus_bus_get(DBUS_BUS_SYSTEM, &error)) ||
 264         dbus_error_is_set (&error))
 265         goto fail;
 266
 267     if (avahi_dbus_connection_glue(client->bus, poll_api) < 0) {
 268         if (ret_error)
 269             *ret_error = AVAHI_ERR_NO_MEMORY; /* Not optimal */
 270         goto fail;
 271     }
 272
 273     if (!dbus_connection_add_filter (client->bus, filter_func, client, NULL)) {
 274         if (ret_error)
 275             *ret_error = AVAHI_ERR_NO_MEMORY;
 276         goto fail;
 277     }
 278
 279     dbus_bus_add_match(
 280         client->bus,
 281         "type='signal', "
 282         "interface='" AVAHI_DBUS_INTERFACE_SERVER "', "
 283         "sender='" AVAHI_DBUS_NAME "', "
 284         "path='" AVAHI_DBUS_PATH_SERVER "'",
 285         &error);
 286
 287     if (dbus_error_is_set (&error))
 288         goto fail;
 289
 290     dbus_bus_add_match (
 291         client->bus,
 292         "type='signal', "
 293         "interface='" DBUS_INTERFACE_DBUS "', "
 294         "sender='" DBUS_SERVICE_DBUS "', "
 295         "path='" DBUS_PATH_DBUS "'",
 296         &error);
 297
 298     if (dbus_error_is_set (&error))
 299         goto fail;
 300
 301         dbus_bus_add_match (
 302         client->bus,
 303         "type='signal', "
 304         "interface='" DBUS_INTERFACE_LOCAL "'",
 305         &error);
 306
 307     if (dbus_error_is_set (&error))
 308         goto fail;
 309
 310     if (!(dbus_bus_name_has_owner(client->bus, AVAHI_DBUS_NAME, &error)) ||
 311         dbus_error_is_set(&error)) {
 312
 313         if (ret_error)
 314             *ret_error = AVAHI_ERR_NO_DAEMON;
 315
 316         goto fail;
 317     }
 318
 319     if (get_server_state(client, ret_error) < 0)
 320         goto fail;
 321
 322     return client;
 323
 324 fail:
 325
 326     if (client)
 327         avahi_client_free(client);
 328
 329     if (dbus_error_is_set(&error)) {
 330
 331         if (ret_error)
 332             *ret_error = avahi_error_dbus_to_number(error.name);
 333
 334         dbus_error_free(&error);
 335     }
 336
 337     return NULL;
 338 }
 339
 340 void avahi_client_free(AvahiClient *client) {
 341     assert(client);
 342
 343     while (client->groups)
 344         avahi_entry_group_free(client->groups);
 345
 346     while (client->domain_browsers)
 347         avahi_domain_browser_free(client->domain_browsers);
 348
 349     while (client->service_browsers)
 350         avahi_service_browser_free(client->service_browsers);
 351
 352     while (client->service_type_browsers)
 353         avahi_service_type_browser_free(client->service_type_browsers);
 354
 355     if (client->bus) {
 356         dbus_connection_disconnect(client->bus);
 357         dbus_connection_unref(client->bus);
 358     }
 359
 360     avahi_free(client->version_string);
 361     avahi_free(client->host_name);
 362     avahi_free(client->host_name_fqdn);
 363     avahi_free(client->domain_name);
 364
 365     avahi_free(client);
 366 }
 367
 368 static char* avahi_client_get_string_reply_and_block (AvahiClient *client, const char *method, const char *param) {
 369     DBusMessage *message = NULL, *reply = NULL;
 370     DBusError error;
 371     char *ret, *n;
 372
 373     assert(client);
 374     assert(method);
 375
 376     dbus_error_init (&error);
 377
 378     if (!(message = dbus_message_new_method_call (AVAHI_DBUS_NAME, AVAHI_DBUS_PATH_SERVER, AVAHI_DBUS_INTERFACE_SERVER, method))) {
 379         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 380         goto fail;
 381     }
 382
 383     if (param) {
 384         if (!dbus_message_append_args (message, DBUS_TYPE_STRING, &param, DBUS_TYPE_INVALID)) {
 385             avahi_client_set_errno (client, AVAHI_ERR_NO_MEMORY);
 386             goto fail;
 387         }
 388     }
 389
 390     reply = dbus_connection_send_with_reply_and_block (client->bus, message, -1, &error);
 391
 392     if (!reply || dbus_error_is_set (&error))
 393         goto fail;
 394
 395     if (!dbus_message_get_args (reply, &error, DBUS_TYPE_STRING, &ret, DBUS_TYPE_INVALID) ||
 396         dbus_error_is_set (&error))
 397         goto fail;
 398
 399     if (!(n = avahi_strdup(ret))) {
 400         avahi_client_set_errno(client, AVAHI_ERR_NO_MEMORY);
 401         goto fail;
 402     }
 403
 404     dbus_message_unref(message);
 405     dbus_message_unref(reply);
 406
 407     return n;
 408
 409 fail:
 410
 411     if (message)
 412         dbus_message_unref(message);
 413     if (reply)
 414         dbus_message_unref(reply);
 415
 416     if (dbus_error_is_set(&error)) {
 417         avahi_client_set_dbus_error(client, &error);
 418         dbus_error_free(&error);
 419     }
 420
 421     return NULL;
 422 }
 423
 424 const char* avahi_client_get_version_string (AvahiClient *client) {
 425     assert(client);
 426
 427     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 428         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 429         return NULL;
 430     }
 431
 432     if (!client->version_string)
 433         client->version_string = avahi_client_get_string_reply_and_block(client, "GetVersionString", NULL);
 434
 435     return client->version_string;
 436 }
 437
 438 const char* avahi_client_get_domain_name (AvahiClient *client) {
 439     assert(client);
 440
 441     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 442         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 443         return NULL;
 444     }
 445
 446     if (!client->domain_name)
 447         client->domain_name = avahi_client_get_string_reply_and_block(client, "GetDomainName", NULL);
 448
 449     return client->domain_name;
 450 }
 451
 452 const char* avahi_client_get_host_name (AvahiClient *client) {
 453     assert(client);
 454
 455     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 456         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 457         return NULL;
 458     }
 459
 460     if (!client->host_name)
 461         client->host_name = avahi_client_get_string_reply_and_block(client, "GetHostName", NULL);
 462
 463     return client->host_name;
 464 }
 465
 466 const char* avahi_client_get_host_name_fqdn (AvahiClient *client) {
 467     assert(client);
 468
 469     if (client->state == AVAHI_CLIENT_DISCONNECTED) {
 470         avahi_client_set_errno(client, AVAHI_ERR_BAD_STATE);
 471         return NULL;
 472     }
 473
 474     if (!client->host_name_fqdn)
 475         client->host_name_fqdn = avahi_client_get_string_reply_and_block(client, "GetHostNameFqdn", NULL);
 476
 477     return client->host_name_fqdn;
 478 }
 479
 480 AvahiClientState avahi_client_get_state(AvahiClient *client) {
 481     assert(client);
 482
 483     return client->state;
 484 }
 485
 486 int avahi_client_errno(AvahiClient *client) {
 487     assert(client);
 488
 489     return client->error;
 490 }