dbus.c

   1 /*
   2  * dbus.c - awesome dbus support
   3  *
   4  * Copyright © 2008-2009 Julien Danjou <julien@danjou.info>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  */
  21
  22 #include "config.h"
  23
  24 #include "dbus.h"
  25 #include <glib.h>
  26
  27 #ifdef WITH_DBUS
  28
  29 #include <dbus/dbus.h>
  30 #include <unistd.h>
  31 #include <fcntl.h>
  32
  33 #include "event.h"
  34 #include "luaa.h"
  35
  36 static DBusConnection *dbus_connection_session = NULL;
  37 static DBusConnection *dbus_connection_system = NULL;
  38 static GSource *session_source = NULL;
  39 static GSource *system_source = NULL;
  40
  41 static signal_array_t dbus_signals;
  42
  43 /** Clean up the D-Bus connection data members
  44  * \param dbus_connection The D-Bus connection to clean up
  45  * \param dbusio The D-Bus event watcher
  46  */
  47 static void
  48 a_dbus_cleanup_bus(DBusConnection *dbus_connection, GSource **source)
  49 {
  50     if(!dbus_connection)
  51         return;
  52
  53     if (*source != NULL)
  54         g_source_destroy(*source);
  55     *source = NULL;
  56
  57     /* This is a shared connection owned by libdbus
  58      * Do not close it, only unref
  59      */
  60     dbus_connection_unref(dbus_connection);
  61 }
  62
  63 /** Iterate through the D-Bus messages counting each or traverse each sub message.
  64  * \param iter The D-Bus message iterator pointer
  65  * \return The number of arguments in the iterator
  66  */
  67 static int
  68 a_dbus_message_iter(DBusMessageIter *iter)
  69 {
  70     int nargs = 0;
  71
  72     do
  73     {
  74         switch(dbus_message_iter_get_arg_type(iter))
  75         {
  76           default:
  77             lua_pushnil(globalconf.L);
  78             nargs++;
  79             break;
  80           case DBUS_TYPE_INVALID:
  81             break;
  82           case DBUS_TYPE_VARIANT:
  83             {
  84                 DBusMessageIter subiter;
  85                 dbus_message_iter_recurse(iter, &subiter);
  86                 a_dbus_message_iter(&subiter);
  87             }
  88             nargs++;
  89             break;
  90           case DBUS_TYPE_DICT_ENTRY:
  91             {
  92                 DBusMessageIter subiter;
  93
  94                 /* initialize a sub iterator */
  95                 dbus_message_iter_recurse(iter, &subiter);
  96                 /* create a new table to store the dict */
  97                 a_dbus_message_iter(&subiter);
  98             }
  99             nargs++;
 100             break;
 101           case DBUS_TYPE_STRUCT:
 102             {
 103                 DBusMessageIter subiter;
 104                 /* initialize a sub iterator */
 105                 dbus_message_iter_recurse(iter, &subiter);
 106
 107                 int n = a_dbus_message_iter(&subiter);
 108
 109                 /* create a new table to store all the value */
 110                 lua_createtable(globalconf.L, n, 0);
 111                 /* move the table before array elements */
 112                 lua_insert(globalconf.L, - n - 1);
 113
 114                 for(int i = n; i > 0; i--)
 115                     lua_rawseti(globalconf.L, - i - 1, i);
 116             }
 117             nargs++;
 118             break;
 119           case DBUS_TYPE_ARRAY:
 120             {
 121                 int array_type = dbus_message_iter_get_element_type(iter);
 122
 123                 if(dbus_type_is_fixed(array_type))
 124                 {
 125                     DBusMessageIter sub;
 126                     dbus_message_iter_recurse(iter, &sub);
 127
 128                     switch(array_type)
 129                     {
 130                       int datalen = 0;
 131 #define DBUS_MSG_HANDLE_ARRAY_TYPE_NUMBER(type, dbustype) \
 132                       case dbustype: \
 133                         { \
 134                             const type *data; \
 135                             dbus_message_iter_get_fixed_array(&sub, &data, &datalen); \
 136                             lua_createtable(globalconf.L, datalen, 0); \
 137                             for(int i = 0; i < datalen; i++) \
 138                             { \
 139                                 lua_pushnumber(globalconf.L, data[i]); \
 140                                 lua_rawseti(globalconf.L, -2, i + 1); \
 141                             } \
 142                         } \
 143                         break;
 144                       DBUS_MSG_HANDLE_ARRAY_TYPE_NUMBER(int16_t, DBUS_TYPE_INT16)
 145                       DBUS_MSG_HANDLE_ARRAY_TYPE_NUMBER(uint16_t, DBUS_TYPE_UINT16)
 146                       DBUS_MSG_HANDLE_ARRAY_TYPE_NUMBER(int32_t, DBUS_TYPE_INT32)
 147                       DBUS_MSG_HANDLE_ARRAY_TYPE_NUMBER(uint32_t, DBUS_TYPE_UINT32)
 148                       DBUS_MSG_HANDLE_ARRAY_TYPE_NUMBER(int64_t, DBUS_TYPE_INT64)
 149                       DBUS_MSG_HANDLE_ARRAY_TYPE_NUMBER(uint64_t, DBUS_TYPE_UINT64)
 150                       DBUS_MSG_HANDLE_ARRAY_TYPE_NUMBER(double, DBUS_TYPE_DOUBLE)
 151 #undef DBUS_MSG_HANDLE_ARRAY_TYPE_NUMBER
 152                       case DBUS_TYPE_BYTE:
 153                         {
 154                             const char *c;
 155                             dbus_message_iter_get_fixed_array(&sub, &c, &datalen);
 156                             lua_pushlstring(globalconf.L, c, datalen);
 157                         }
 158                         break;
 159                       case DBUS_TYPE_BOOLEAN:
 160                         {
 161                             const dbus_bool_t *b;
 162                             dbus_message_iter_get_fixed_array(&sub, &b, &datalen);
 163                             lua_createtable(globalconf.L, datalen, 0);
 164                             for(int i = 0; i < datalen; i++)
 165                             {
 166                                 lua_pushboolean(globalconf.L, b[i]);
 167                                 lua_rawseti(globalconf.L, -2, i + 1);
 168                             }
 169                         }
 170                         break;
 171                     }
 172                 }
 173                 else if(array_type == DBUS_TYPE_DICT_ENTRY)
 174                 {
 175                     DBusMessageIter subiter;
 176                     /* initialize a sub iterator */
 177                     dbus_message_iter_recurse(iter, &subiter);
 178
 179                     /* get the keys and the values
 180                      * n is the number of entry in dict */
 181                     int n = a_dbus_message_iter(&subiter);
 182
 183                     /* create a new table to store all the value */
 184                     lua_createtable(globalconf.L, n, 0);
 185                     /* move the table before array elements */
 186                     lua_insert(globalconf.L, - (n * 2) - 1);
 187
 188                     for(int i = 0; i < n; i ++)
 189                         lua_rawset(globalconf.L, - (n * 2) - 1 + i * 2);
 190                 }
 191                 else
 192                 {
 193                     DBusMessageIter subiter;
 194                     /* prepare to dig into the array*/
 195                     dbus_message_iter_recurse(iter, &subiter);
 196
 197                     /* now iterate over every element of the array */
 198                     int n = a_dbus_message_iter(&subiter);
 199
 200                     /* create a new table to store all the value */
 201                     lua_createtable(globalconf.L, n, 0);
 202                     /* move the table before array elements */
 203                     lua_insert(globalconf.L, - n - 1);
 204
 205                     for(int i = n; i > 0; i--)
 206                         lua_rawseti(globalconf.L, - i - 1, i);
 207                 }
 208             }
 209             nargs++;
 210             break;
 211           case DBUS_TYPE_BOOLEAN:
 212             {
 213                 dbus_bool_t b;
 214                 dbus_message_iter_get_basic(iter, &b);
 215                 lua_pushboolean(globalconf.L, b);
 216             }
 217             nargs++;
 218             break;
 219           case DBUS_TYPE_BYTE:
 220             {
 221                 char c;
 222                 dbus_message_iter_get_basic(iter, &c);
 223                 lua_pushlstring(globalconf.L, &c, 1);
 224             }
 225             nargs++;
 226             break;
 227 #define DBUS_MSG_HANDLE_TYPE_NUMBER(type, dbustype) \
 228           case dbustype: \
 229             { \
 230                 type ui; \
 231                 dbus_message_iter_get_basic(iter, &ui); \
 232                 lua_pushnumber(globalconf.L, ui); \
 233             } \
 234             nargs++; \
 235             break;
 236           DBUS_MSG_HANDLE_TYPE_NUMBER(int16_t, DBUS_TYPE_INT16)
 237           DBUS_MSG_HANDLE_TYPE_NUMBER(uint16_t, DBUS_TYPE_UINT16)
 238           DBUS_MSG_HANDLE_TYPE_NUMBER(int32_t, DBUS_TYPE_INT32)
 239           DBUS_MSG_HANDLE_TYPE_NUMBER(uint32_t, DBUS_TYPE_UINT32)
 240           DBUS_MSG_HANDLE_TYPE_NUMBER(int64_t, DBUS_TYPE_INT64)
 241           DBUS_MSG_HANDLE_TYPE_NUMBER(uint64_t, DBUS_TYPE_UINT64)
 242 #undef DBUS_MSG_HANDLE_TYPE_NUMBER
 243           case DBUS_TYPE_STRING:
 244             {
 245                 char *s;
 246                 dbus_message_iter_get_basic(iter, &s);
 247                 lua_pushstring(globalconf.L, s);
 248             }
 249             nargs++;
 250             break;
 251         }
 252     } while(dbus_message_iter_next(iter));
 253
 254     return nargs;
 255 }
 256
 257 static bool
 258 a_dbus_convert_value(lua_State *L, int idx, DBusMessageIter *iter)
 259 {
 260     /* i is the type name, i+1 the value */
 261     size_t len;
 262     const char *type = lua_tolstring(globalconf.L, idx, &len);
 263
 264     if(!type || len < 1)
 265         return false;
 266
 267     switch(*type)
 268     {
 269       case DBUS_TYPE_ARRAY:
 270         {
 271             DBusMessageIter subiter;
 272             dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY,
 273                                              type + 1,
 274                                              &subiter);
 275
 276             int arraylen = luaA_rawlen(L, idx + 1);
 277
 278             if(arraylen % 2 != 0)
 279             {
 280                 luaA_warn(globalconf.L,
 281                           "your D-Bus signal handling method returned wrong number of arguments");
 282                 return false;
 283             }
 284
 285             /* Push the array */
 286             lua_pushvalue(L, idx + 1);
 287
 288             for(int i = 1; i < arraylen; i += 2)
 289             {
 290                 lua_rawgeti(L, -1, i);
 291                 lua_rawgeti(L, -2, i + 1);
 292                 if(!a_dbus_convert_value(L, -2, &subiter))
 293                     return false;
 294                 lua_pop(L, 2);
 295             }
 296
 297             /* Remove the array */
 298             lua_pop(L, 1);
 299
 300             dbus_message_iter_close_container(iter, &subiter);
 301         }
 302         break;
 303       case DBUS_TYPE_BOOLEAN:
 304         {
 305             dbus_bool_t b = lua_toboolean(globalconf.L, idx + 1);
 306             dbus_message_iter_append_basic(iter, DBUS_TYPE_BOOLEAN, &b);
 307         }
 308         break;
 309 #define DBUS_MSG_RETURN_HANDLE_TYPE_STRING(dbustype) \
 310       case dbustype: \
 311         { \
 312             const char *s = lua_tostring(globalconf.L, idx + 1); \
 313             if(s) \
 314                 dbus_message_iter_append_basic(iter, dbustype, &s); \
 315         } \
 316         break;
 317     DBUS_MSG_RETURN_HANDLE_TYPE_STRING(DBUS_TYPE_STRING)
 318     DBUS_MSG_RETURN_HANDLE_TYPE_STRING(DBUS_TYPE_BYTE)
 319 #undef DBUS_MSG_RETURN_HANDLE_TYPE_STRING
 320 #define DBUS_MSG_RETURN_HANDLE_TYPE_NUMBER(type, dbustype) \
 321       case dbustype: \
 322         { \
 323            type num = lua_tonumber(globalconf.L, idx + 1); \
 324            dbus_message_iter_append_basic(iter, dbustype, &num); \
 325         } \
 326         break;
 327     DBUS_MSG_RETURN_HANDLE_TYPE_NUMBER(int16_t, DBUS_TYPE_INT16)
 328     DBUS_MSG_RETURN_HANDLE_TYPE_NUMBER(uint16_t, DBUS_TYPE_UINT16)
 329     DBUS_MSG_RETURN_HANDLE_TYPE_NUMBER(int32_t, DBUS_TYPE_INT32)
 330     DBUS_MSG_RETURN_HANDLE_TYPE_NUMBER(uint32_t, DBUS_TYPE_UINT32)
 331     DBUS_MSG_RETURN_HANDLE_TYPE_NUMBER(int64_t, DBUS_TYPE_INT64)
 332     DBUS_MSG_RETURN_HANDLE_TYPE_NUMBER(uint64_t, DBUS_TYPE_UINT64)
 333     DBUS_MSG_RETURN_HANDLE_TYPE_NUMBER(double, DBUS_TYPE_DOUBLE)
 334 #undef DBUS_MSG_RETURN_HANDLE_TYPE_NUMBER
 335     }
 336
 337     return true;
 338 }
 339
 340 /** Process a single request from D-Bus
 341  * \param dbus_connection  The connection to the D-Bus server.
 342  * \param msg The D-Bus message request being sent to the D-Bus connection.
 343  */
 344 static void
 345 a_dbus_process_request(DBusConnection *dbus_connection, DBusMessage *msg)
 346 {
 347     const char *interface = dbus_message_get_interface(msg);
 348     int old_top = lua_gettop(globalconf.L);
 349
 350     lua_createtable(globalconf.L, 0, 5);
 351
 352     switch(dbus_message_get_type(msg))
 353     {
 354       case DBUS_MESSAGE_TYPE_SIGNAL:
 355         lua_pushliteral(globalconf.L, "signal");
 356         break;
 357       case DBUS_MESSAGE_TYPE_METHOD_CALL:
 358         lua_pushliteral(globalconf.L, "method_call");
 359         break;
 360       case DBUS_MESSAGE_TYPE_METHOD_RETURN:
 361         lua_pushliteral(globalconf.L, "method_return");
 362         break;
 363       case DBUS_MESSAGE_TYPE_ERROR:
 364         lua_pushliteral(globalconf.L, "error");
 365         break;
 366       default:
 367         lua_pushliteral(globalconf.L, "unknown");
 368         break;
 369     }
 370
 371     lua_setfield(globalconf.L, -2, "type");
 372
 373     lua_pushstring(globalconf.L, interface);
 374     lua_setfield(globalconf.L, -2, "interface");
 375
 376     const char *s = dbus_message_get_path(msg);
 377     lua_pushstring(globalconf.L, s);
 378     lua_setfield(globalconf.L, -2, "path");
 379
 380     s = dbus_message_get_member(msg);
 381     lua_pushstring(globalconf.L, s);
 382     lua_setfield(globalconf.L, -2, "member");
 383
 384     if(dbus_connection == dbus_connection_system)
 385         lua_pushliteral(globalconf.L, "system");
 386     else
 387         lua_pushliteral(globalconf.L, "session");
 388     lua_setfield(globalconf.L, -2, "bus");
 389
 390     /* + 1 for the table above */
 391     DBusMessageIter iter;
 392     int nargs = 1;
 393
 394     if(dbus_message_iter_init(msg, &iter))
 395         nargs += a_dbus_message_iter(&iter);
 396
 397     if(dbus_message_get_no_reply(msg))
 398     {
 399         signal_t *sigfound = signal_array_getbyid(&dbus_signals,
 400                                                   a_strhash((const unsigned char *) NONULL(interface)));
 401         /* emit signals */
 402         if(sigfound)
 403             signal_object_emit(globalconf.L, &dbus_signals, NONULL(interface), nargs);
 404     }
 405     else
 406     {
 407         signal_t *sig = signal_array_getbyid(&dbus_signals,
 408                                              a_strhash((const unsigned char *) NONULL(interface)));
 409         if(sig)
 410         {
 411             /* there can be only ONE handler to send reply */
 412             void *func = (void *) sig->sigfuncs.tab[0];
 413
 414             int n = lua_gettop(globalconf.L) - nargs;
 415
 416             luaA_object_push(globalconf.L, (void *) func);
 417             luaA_dofunction(globalconf.L, nargs, LUA_MULTRET);
 418
 419             n -= lua_gettop(globalconf.L);
 420
 421             DBusMessage *reply = dbus_message_new_method_return(msg);
 422
 423             dbus_message_iter_init_append(reply, &iter);
 424
 425             if(n % 2 != 0)
 426             {
 427                 luaA_warn(globalconf.L,
 428                           "your D-Bus signal handling method returned wrong number of arguments");
 429                 /* Restore stack */
 430                 lua_settop(globalconf.L, old_top);
 431                 return;
 432             }
 433
 434             /* i is negative */
 435             for(int i = n; i < 0; i += 2)
 436             {
 437                 if(!a_dbus_convert_value(globalconf.L, i, &iter))
 438                 {
 439                     luaA_warn(globalconf.L, "your D-Bus signal handling method returned bad data");
 440                     /* Restore stack */
 441                     lua_settop(globalconf.L, old_top);
 442                     return;
 443                 }
 444
 445                 lua_remove(globalconf.L, i);
 446                 lua_remove(globalconf.L, i + 1);
 447             }
 448
 449             dbus_connection_send(dbus_connection, reply, NULL);
 450             dbus_message_unref(reply);
 451         }
 452     }
 453     /* Restore stack */
 454     lua_settop(globalconf.L, old_top);
 455 }
 456
 457 /** Attempt to process all the requests in the D-Bus connection.
 458  * \param dbus_connection The D-Bus connection to process from
 459  * \param dbusio The D-Bus event watcher
 460  */
 461 static void
 462 a_dbus_process_requests_on_bus(DBusConnection *dbus_connection, GSource **source)
 463 {
 464     DBusMessage *msg;
 465     int nmsg = 0;
 466
 467     while(true)
 468     {
 469         dbus_connection_read_write(dbus_connection, 0);
 470
 471         if(!(msg = dbus_connection_pop_message(dbus_connection)))
 472             break;
 473
 474         if(dbus_message_is_signal(msg, DBUS_INTERFACE_LOCAL, "Disconnected"))
 475         {
 476             a_dbus_cleanup_bus(dbus_connection, source);
 477             dbus_message_unref(msg);
 478             return;
 479         }
 480         else
 481             a_dbus_process_request(dbus_connection, msg);
 482
 483         dbus_message_unref(msg);
 484
 485         nmsg++;
 486     }
 487
 488     if(nmsg)
 489         dbus_connection_flush(dbus_connection);
 490 }
 491
 492 /** Foreword D-Bus process session requests on too the correct function.
 493  * \param w The D-Bus event watcher
 494  * \param revents (not used)
 495  */
 496 static gboolean
 497 a_dbus_process_requests_session(gpointer data)
 498 {
 499     a_dbus_process_requests_on_bus(dbus_connection_session, &session_source);
 500     return TRUE;
 501 }
 502
 503 /** Foreword D-Bus process system requests on too the correct function.
 504  * \param w The D-Bus event watcher
 505  * \param revents (not used)
 506  */
 507 static gboolean
 508 a_dbus_process_requests_system(gpointer data)
 509 {
 510     a_dbus_process_requests_on_bus(dbus_connection_system, &system_source);
 511     return TRUE;
 512 }
 513
 514 /** Attempt to request a D-Bus name
 515  * \param dbus_connection The application's connection to D-Bus
 516  * \param name The D-Bus connection name to be requested
 517  * \return true if the name is primary owner or the name is already
 518  * the owner, otherwise false.
 519  */
 520 static bool
 521 a_dbus_request_name(DBusConnection *dbus_connection, const char *name)
 522 {
 523     DBusError err;
 524
 525     if(!dbus_connection)
 526         return false;
 527
 528     dbus_error_init(&err);
 529
 530     int ret = dbus_bus_request_name(dbus_connection, name, 0, &err);
 531
 532     if(dbus_error_is_set(&err))
 533     {
 534         warn("failed to request D-Bus name: %s", err.message);
 535         dbus_error_free(&err);
 536         return false;
 537     }
 538
 539     switch(ret)
 540     {
 541       case DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER:
 542         return true;
 543       case DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER:
 544         warn("already primary D-Bus name owner for %s", name);
 545         return true;
 546     }
 547     return false;
 548 }
 549
 550 /** Attempt to release the D-Bus name owner
 551  * \param dbus_connection The application's connection to the D-Bus
 552  * \param name The name to be released
 553  * \return True on success. False if the name is not
 554  * the owner, or does not exist.
 555  */
 556 static bool
 557 a_dbus_release_name(DBusConnection *dbus_connection, const char *name)
 558 {
 559     DBusError err;
 560
 561     if(!dbus_connection)
 562         return false;
 563
 564     dbus_error_init(&err);
 565
 566     int ret = dbus_bus_release_name(dbus_connection, name, &err);
 567
 568     if(dbus_error_is_set(&err))
 569     {
 570         warn("failed to release D-Bus name: %s", err.message);
 571         dbus_error_free(&err);
 572         return false;
 573     }
 574
 575     switch(ret)
 576     {
 577       case DBUS_RELEASE_NAME_REPLY_NOT_OWNER:
 578         warn("not primary D-Bus name owner for %s", name);
 579         return false;
 580       case DBUS_RELEASE_NAME_REPLY_NON_EXISTENT:
 581         warn("non existent D-Bus name: %s", name);
 582         return false;
 583     }
 584     return true;
 585 }
 586
 587 /** Attempt to create a new connection to D-Bus
 588  * \param type The bus type to use when connecting to D-Bus
 589  * \param type_name The bus type name eg: "session" or "system"
 590  * \param cb Function callback to use when processing requests
 591  * \param source A new GSource that will be used for watching the dbus connection.
 592  * \return The requested D-Bus connection on success, NULL on failure.
 593  */
 594 static DBusConnection *
 595 a_dbus_connect(DBusBusType type, const char *type_name, GSourceFunc cb, GSource **source)
 596 {
 597     int fd;
 598     DBusConnection *dbus_connection;
 599     DBusError err;
 600
 601     dbus_error_init(&err);
 602
 603     dbus_connection = dbus_bus_get(type, &err);
 604     if(dbus_error_is_set(&err))
 605     {
 606         warn("D-Bus session bus %s failed: %s", type_name, err.message);
 607         dbus_connection = NULL;
 608         dbus_error_free(&err);
 609     }
 610     else
 611     {
 612         dbus_connection_set_exit_on_disconnect(dbus_connection, false);
 613         if(dbus_connection_get_unix_fd(dbus_connection, &fd))
 614         {
 615             GIOChannel *channel = g_io_channel_unix_new(fd);
 616             *source = g_io_create_watch(channel, G_IO_IN);
 617             g_io_channel_unref(channel);
 618             g_source_set_callback(*source, cb, NULL, NULL);
 619             g_source_attach(*source, NULL);
 620
 621             fcntl(fd, F_SETFD, FD_CLOEXEC);
 622         }
 623         else
 624         {
 625             warn("cannot get D-Bus connection file descriptor");
 626             a_dbus_cleanup_bus(dbus_connection, source);
 627         }
 628     }
 629
 630     return dbus_connection;
 631 }
 632
 633 /** Initialize the D-Bus session and system
 634  */
 635 void
 636 a_dbus_init(void)
 637 {
 638     dbus_connection_session = a_dbus_connect(DBUS_BUS_SESSION, "session",
 639                                              a_dbus_process_requests_session, &session_source);
 640     dbus_connection_system = a_dbus_connect(DBUS_BUS_SYSTEM, "system",
 641                                             a_dbus_process_requests_system, &system_source);
 642 }
 643
 644 /** Cleanup the D-Bus session and system
 645  */
 646 void
 647 a_dbus_cleanup(void)
 648 {
 649     a_dbus_cleanup_bus(dbus_connection_session, &session_source);
 650     a_dbus_cleanup_bus(dbus_connection_system, &system_source);
 651 }
 652
 653 /** Retrieve the D-Bus bus by it's name
 654  * \param name The name of the bus
 655  * \return The corresponding D-Bus connection
 656  */
 657 static DBusConnection *
 658 a_dbus_bus_getbyname(const char *name)
 659 {
 660     if(A_STREQ(name, "system"))
 661         return dbus_connection_system;
 662     if(A_STREQ(name, "session"))
 663         return dbus_connection_session;
 664     return NULL;
 665 }
 666
 667 /** Register a D-Bus name to receive message from.
 668  * \param L The Lua VM state.
 669  * \return The number of elements pushed on stack.
 670  * \luastack
 671  * \lparam A string indicating if we are using system or session bus.
 672  * \lparam A string with the name of the D-Bus name to register.
 673  * \lreturn True if everything worked fine, false otherwise.
 674  */
 675 static int
 676 luaA_dbus_request_name(lua_State *L)
 677 {
 678     const char *bus = luaL_checkstring(L, 1);
 679     const char *name = luaL_checkstring(L, 2);
 680     DBusConnection *dbus_connection = a_dbus_bus_getbyname(bus);
 681     lua_pushboolean(L, a_dbus_request_name(dbus_connection, name));
 682     return 1;
 683 }
 684
 685 /** Release a D-Bus name.
 686  * \param L The Lua VM state.
 687  * \return The number of elements pushed on stack.
 688  * \luastack
 689  * \lparam A string indicating if we are using system or session bus.
 690  * \lparam A string with the name of the D-Bus name to unregister.
 691  * \lreturn True if everything worked fine, false otherwise.
 692  */
 693 static int
 694 luaA_dbus_release_name(lua_State *L)
 695 {
 696     const char *bus = luaL_checkstring(L, 1);
 697     const char *name = luaL_checkstring(L, 2);
 698     DBusConnection *dbus_connection = a_dbus_bus_getbyname(bus);
 699     lua_pushboolean(L, a_dbus_release_name(dbus_connection, name));
 700     return 1;
 701 }
 702
 703 /** Add a match rule to match messages going through the message bus.
 704  * \param L The Lua VM state.
 705  * \return The number of elements pushed on stack.
 706  * \luastack
 707  * \lparam A string indicating if we are using system or session bus.
 708  * \lparam A string with the name of the match rule.
 709  */
 710 static int
 711 luaA_dbus_add_match(lua_State *L)
 712 {
 713     const char *bus = luaL_checkstring(L, 1);
 714     const char *name = luaL_checkstring(L, 2);
 715     DBusConnection *dbus_connection = a_dbus_bus_getbyname(bus);
 716
 717     if(dbus_connection)
 718     {
 719         dbus_bus_add_match(dbus_connection, name, NULL);
 720         dbus_connection_flush(dbus_connection);
 721     }
 722
 723     return 0;
 724 }
 725
 726 /** Remove a previously added match rule "by value"
 727  * (the most recently-added identical rule gets removed).
 728  * \param L The Lua VM state.
 729  * \return The number of elements pushed on stack.
 730  * \luastack
 731  * \lparam A string indicating if we are using system or session bus.
 732  * \lparam A string with the name of the match rule.
 733  */
 734 static int
 735 luaA_dbus_remove_match(lua_State *L)
 736 {
 737     const char *bus = luaL_checkstring(L, 1);
 738     const char *name = luaL_checkstring(L, 2);
 739     DBusConnection *dbus_connection = a_dbus_bus_getbyname(bus);
 740
 741     if(dbus_connection)
 742     {
 743         dbus_bus_remove_match(dbus_connection, name, NULL);
 744         dbus_connection_flush(dbus_connection);
 745     }
 746
 747     return 0;
 748 }
 749
 750 /** Add a signal receiver on the D-Bus.
 751  * \param L The Lua VM state.
 752  * \return The number of elements pushed on stack.
 753  * \luastack
 754  * \lparam A string with the interface name.
 755  * \lparam The function to call.
 756  */
 757 static int
 758 luaA_dbus_connect_signal(lua_State *L)
 759 {
 760     const char *name = luaL_checkstring(L, 1);
 761     luaA_checkfunction(L, 2);
 762     signal_t *sig = signal_array_getbyid(&dbus_signals,
 763                                          a_strhash((const unsigned char *) name));
 764     if(sig)
 765         luaA_warn(L, "cannot add signal %s on D-Bus, already existing", name);
 766     else
 767     {
 768         signal_add(&dbus_signals, name);
 769         signal_connect(&dbus_signals, name, luaA_object_ref(L, 2));
 770     }
 771     return 0;
 772 }
 773
 774 /** Add a signal receiver on the D-Bus.
 775  * \param L The Lua VM state.
 776  * \return The number of elements pushed on stack.
 777  * \luastack
 778  * \lparam A string with the interface name.
 779  * \lparam The function to call.
 780  */
 781 static int
 782 luaA_dbus_disconnect_signal(lua_State *L)
 783 {
 784     const char *name = luaL_checkstring(L, 1);
 785     luaA_checkfunction(L, 2);
 786     const void *func = lua_topointer(L, 2);
 787     signal_disconnect(&dbus_signals, name, func);
 788     luaA_object_unref(L, func);
 789     return 0;
 790 }
 791
 792 const struct luaL_Reg awesome_dbus_lib[] =
 793 {
 794     { "request_name", luaA_dbus_request_name },
 795     { "release_name", luaA_dbus_release_name },
 796     { "add_match", luaA_dbus_add_match },
 797     { "remove_match", luaA_dbus_remove_match },
 798     { "connect_signal", luaA_dbus_connect_signal },
 799     { "disconnect_signal", luaA_dbus_disconnect_signal },
 800     { NULL, NULL }
 801 };
 802
 803 #else /* WITH_DBUS */
 804
 805 /** Empty stub if dbus is not enabled */
 806 void
 807 a_dbus_init(void)
 808 {
 809 }
 810
 811 /** Empty stub if dbus is not enabled */
 812 void
 813 a_dbus_cleanup(void)
 814 {
 815 }
 816
 817 #endif
 818 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80