Emeric Vigier | 2f62582 | 2012-08-06 11:09:52 -0400 | [diff] [blame] | 1 | /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ |
| 2 | /* connection.c Client connections |
| 3 | * |
| 4 | * Copyright (C) 2003 Red Hat, Inc. |
| 5 | * |
| 6 | * Licensed under the Academic Free License version 2.1 |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <config.h> |
| 25 | #include "connection.h" |
| 26 | #include "dispatch.h" |
| 27 | #include "policy.h" |
| 28 | #include "services.h" |
| 29 | #include "utils.h" |
| 30 | #include "signals.h" |
| 31 | #include "expirelist.h" |
| 32 | #include "selinux.h" |
| 33 | #include <dbus/dbus-list.h> |
| 34 | #include <dbus/dbus-hash.h> |
| 35 | #include <dbus/dbus-timeout.h> |
| 36 | |
| 37 | /* Trim executed commands to this length; we want to keep logs readable */ |
| 38 | #define MAX_LOG_COMMAND_LEN 50 |
| 39 | |
| 40 | static void bus_connection_remove_transactions (DBusConnection *connection); |
| 41 | |
| 42 | typedef struct |
| 43 | { |
| 44 | BusExpireItem expire_item; |
| 45 | |
| 46 | DBusConnection *will_get_reply; |
| 47 | DBusConnection *will_send_reply; |
| 48 | |
| 49 | dbus_uint32_t reply_serial; |
| 50 | |
| 51 | } BusPendingReply; |
| 52 | |
| 53 | struct BusConnections |
| 54 | { |
| 55 | int refcount; |
| 56 | DBusList *completed; /**< List of all completed connections */ |
| 57 | int n_completed; /**< Length of completed list */ |
| 58 | DBusList *incomplete; /**< List of all not-yet-active connections */ |
| 59 | int n_incomplete; /**< Length of incomplete list */ |
| 60 | BusContext *context; |
| 61 | DBusHashTable *completed_by_user; /**< Number of completed connections for each UID */ |
| 62 | DBusTimeout *expire_timeout; /**< Timeout for expiring incomplete connections. */ |
| 63 | int stamp; /**< Incrementing number */ |
| 64 | BusExpireList *pending_replies; /**< List of pending replies */ |
| 65 | }; |
| 66 | |
| 67 | static dbus_int32_t connection_data_slot = -1; |
| 68 | |
| 69 | typedef struct |
| 70 | { |
| 71 | BusConnections *connections; |
| 72 | DBusList *link_in_connection_list; |
| 73 | DBusConnection *connection; |
| 74 | DBusList *services_owned; |
| 75 | int n_services_owned; |
| 76 | DBusList *match_rules; |
| 77 | int n_match_rules; |
| 78 | char *name; |
| 79 | DBusList *transaction_messages; /**< Stuff we need to send as part of a transaction */ |
| 80 | DBusMessage *oom_message; |
| 81 | DBusPreallocatedSend *oom_preallocated; |
| 82 | BusClientPolicy *policy; |
| 83 | |
| 84 | char *cached_loginfo_string; |
| 85 | BusSELinuxID *selinux_id; |
| 86 | |
| 87 | long connection_tv_sec; /**< Time when we connected (seconds component) */ |
| 88 | long connection_tv_usec; /**< Time when we connected (microsec component) */ |
| 89 | int stamp; /**< connections->stamp last time we were traversed */ |
| 90 | } BusConnectionData; |
| 91 | |
| 92 | static dbus_bool_t bus_pending_reply_expired (BusExpireList *list, |
| 93 | DBusList *link, |
| 94 | void *data); |
| 95 | |
| 96 | static void bus_connection_drop_pending_replies (BusConnections *connections, |
| 97 | DBusConnection *connection); |
| 98 | |
| 99 | static dbus_bool_t expire_incomplete_timeout (void *data); |
| 100 | |
| 101 | #define BUS_CONNECTION_DATA(connection) (dbus_connection_get_data ((connection), connection_data_slot)) |
| 102 | |
| 103 | static DBusLoop* |
| 104 | connection_get_loop (DBusConnection *connection) |
| 105 | { |
| 106 | BusConnectionData *d; |
| 107 | |
| 108 | d = BUS_CONNECTION_DATA (connection); |
| 109 | |
| 110 | return bus_context_get_loop (d->connections->context); |
| 111 | } |
| 112 | |
| 113 | |
| 114 | static int |
| 115 | get_connections_for_uid (BusConnections *connections, |
| 116 | dbus_uid_t uid) |
| 117 | { |
| 118 | void *val; |
| 119 | int current_count; |
| 120 | |
| 121 | /* val is NULL is 0 when it isn't in the hash yet */ |
| 122 | |
| 123 | val = _dbus_hash_table_lookup_uintptr (connections->completed_by_user, |
| 124 | uid); |
| 125 | |
| 126 | current_count = _DBUS_POINTER_TO_INT (val); |
| 127 | |
| 128 | return current_count; |
| 129 | } |
| 130 | |
| 131 | static dbus_bool_t |
| 132 | adjust_connections_for_uid (BusConnections *connections, |
| 133 | dbus_uid_t uid, |
| 134 | int adjustment) |
| 135 | { |
| 136 | int current_count; |
| 137 | |
| 138 | current_count = get_connections_for_uid (connections, uid); |
| 139 | |
| 140 | _dbus_verbose ("Adjusting connection count for UID " DBUS_UID_FORMAT |
| 141 | ": was %d adjustment %d making %d\n", |
| 142 | uid, current_count, adjustment, current_count + adjustment); |
| 143 | |
| 144 | _dbus_assert (current_count >= 0); |
| 145 | |
| 146 | current_count += adjustment; |
| 147 | |
| 148 | _dbus_assert (current_count >= 0); |
| 149 | |
| 150 | if (current_count == 0) |
| 151 | { |
| 152 | _dbus_hash_table_remove_uintptr (connections->completed_by_user, uid); |
| 153 | return TRUE; |
| 154 | } |
| 155 | else |
| 156 | { |
| 157 | dbus_bool_t retval; |
| 158 | |
| 159 | retval = _dbus_hash_table_insert_uintptr (connections->completed_by_user, |
| 160 | uid, _DBUS_INT_TO_POINTER (current_count)); |
| 161 | |
| 162 | /* only positive adjustment can fail as otherwise |
| 163 | * a hash entry should already exist |
| 164 | */ |
| 165 | _dbus_assert (adjustment > 0 || |
| 166 | (adjustment <= 0 && retval)); |
| 167 | |
| 168 | return retval; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | void |
| 173 | bus_connection_disconnected (DBusConnection *connection) |
| 174 | { |
| 175 | BusConnectionData *d; |
| 176 | BusService *service; |
| 177 | BusMatchmaker *matchmaker; |
| 178 | |
| 179 | d = BUS_CONNECTION_DATA (connection); |
| 180 | _dbus_assert (d != NULL); |
| 181 | |
| 182 | _dbus_verbose ("%s disconnected, dropping all service ownership and releasing\n", |
| 183 | d->name ? d->name : "(inactive)"); |
| 184 | |
| 185 | /* Delete our match rules */ |
| 186 | if (d->n_match_rules > 0) |
| 187 | { |
| 188 | matchmaker = bus_context_get_matchmaker (d->connections->context); |
| 189 | bus_matchmaker_disconnected (matchmaker, connection); |
| 190 | } |
| 191 | |
| 192 | /* Drop any service ownership. Unfortunately, this requires |
| 193 | * memory allocation and there doesn't seem to be a good way to |
| 194 | * handle it other than sleeping; we can't "fail" the operation of |
| 195 | * disconnecting a client, and preallocating a broadcast "service is |
| 196 | * now gone" message for every client-service pair seems kind of |
| 197 | * involved. |
| 198 | */ |
| 199 | while ((service = _dbus_list_get_last (&d->services_owned))) |
| 200 | { |
| 201 | BusTransaction *transaction; |
| 202 | DBusError error; |
| 203 | |
| 204 | retry: |
| 205 | |
| 206 | dbus_error_init (&error); |
| 207 | |
| 208 | while ((transaction = bus_transaction_new (d->connections->context)) == NULL) |
| 209 | _dbus_wait_for_memory (); |
| 210 | |
| 211 | if (!bus_service_remove_owner (service, connection, |
| 212 | transaction, &error)) |
| 213 | { |
| 214 | _DBUS_ASSERT_ERROR_CONTENT_IS_SET (&error); |
| 215 | |
| 216 | if (dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY)) |
| 217 | { |
| 218 | dbus_error_free (&error); |
| 219 | bus_transaction_cancel_and_free (transaction); |
| 220 | _dbus_wait_for_memory (); |
| 221 | goto retry; |
| 222 | } |
| 223 | else |
| 224 | { |
| 225 | _dbus_verbose ("Failed to remove service owner: %s %s\n", |
| 226 | error.name, error.message); |
| 227 | _dbus_assert_not_reached ("Removing service owner failed for non-memory-related reason"); |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | bus_transaction_execute_and_free (transaction); |
| 232 | } |
| 233 | |
| 234 | bus_dispatch_remove_connection (connection); |
| 235 | |
| 236 | /* no more watching */ |
| 237 | if (!dbus_connection_set_watch_functions (connection, |
| 238 | NULL, NULL, NULL, |
| 239 | connection, |
| 240 | NULL)) |
| 241 | _dbus_assert_not_reached ("setting watch functions to NULL failed"); |
| 242 | |
| 243 | if (!dbus_connection_set_timeout_functions (connection, |
| 244 | NULL, NULL, NULL, |
| 245 | connection, |
| 246 | NULL)) |
| 247 | _dbus_assert_not_reached ("setting timeout functions to NULL failed"); |
| 248 | |
| 249 | dbus_connection_set_unix_user_function (connection, |
| 250 | NULL, NULL, NULL); |
| 251 | dbus_connection_set_windows_user_function (connection, |
| 252 | NULL, NULL, NULL); |
| 253 | |
| 254 | dbus_connection_set_dispatch_status_function (connection, |
| 255 | NULL, NULL, NULL); |
| 256 | |
| 257 | bus_connection_remove_transactions (connection); |
| 258 | |
| 259 | if (d->link_in_connection_list != NULL) |
| 260 | { |
| 261 | if (d->name != NULL) |
| 262 | { |
| 263 | unsigned long uid; |
| 264 | |
| 265 | _dbus_list_remove_link (&d->connections->completed, d->link_in_connection_list); |
| 266 | d->link_in_connection_list = NULL; |
| 267 | d->connections->n_completed -= 1; |
| 268 | |
| 269 | if (dbus_connection_get_unix_user (connection, &uid)) |
| 270 | { |
| 271 | if (!adjust_connections_for_uid (d->connections, |
| 272 | uid, -1)) |
| 273 | _dbus_assert_not_reached ("adjusting downward should never fail"); |
| 274 | } |
| 275 | } |
| 276 | else |
| 277 | { |
| 278 | _dbus_list_remove_link (&d->connections->incomplete, d->link_in_connection_list); |
| 279 | d->link_in_connection_list = NULL; |
| 280 | d->connections->n_incomplete -= 1; |
| 281 | } |
| 282 | |
| 283 | _dbus_assert (d->connections->n_incomplete >= 0); |
| 284 | _dbus_assert (d->connections->n_completed >= 0); |
| 285 | } |
| 286 | |
| 287 | bus_connection_drop_pending_replies (d->connections, connection); |
| 288 | |
| 289 | /* frees "d" as side effect */ |
| 290 | dbus_connection_set_data (connection, |
| 291 | connection_data_slot, |
| 292 | NULL, NULL); |
| 293 | |
| 294 | dbus_connection_unref (connection); |
| 295 | } |
| 296 | |
| 297 | static dbus_bool_t |
| 298 | connection_watch_callback (DBusWatch *watch, |
| 299 | unsigned int condition, |
| 300 | void *data) |
| 301 | { |
| 302 | /* FIXME this can be done in dbus-mainloop.c |
| 303 | * if the code in activation.c for the babysitter |
| 304 | * watch handler is fixed. |
| 305 | */ |
| 306 | |
| 307 | #if 0 |
| 308 | _dbus_verbose ("Calling handle_watch\n"); |
| 309 | #endif |
| 310 | return dbus_watch_handle (watch, condition); |
| 311 | } |
| 312 | |
| 313 | static dbus_bool_t |
| 314 | add_connection_watch (DBusWatch *watch, |
| 315 | void *data) |
| 316 | { |
| 317 | DBusConnection *connection = data; |
| 318 | |
| 319 | return _dbus_loop_add_watch (connection_get_loop (connection), |
| 320 | watch, connection_watch_callback, connection, |
| 321 | NULL); |
| 322 | } |
| 323 | |
| 324 | static void |
| 325 | remove_connection_watch (DBusWatch *watch, |
| 326 | void *data) |
| 327 | { |
| 328 | DBusConnection *connection = data; |
| 329 | |
| 330 | _dbus_loop_remove_watch (connection_get_loop (connection), |
| 331 | watch, connection_watch_callback, connection); |
| 332 | } |
| 333 | |
| 334 | static void |
| 335 | connection_timeout_callback (DBusTimeout *timeout, |
| 336 | void *data) |
| 337 | { |
| 338 | /* DBusConnection *connection = data; */ |
| 339 | |
| 340 | /* can return FALSE on OOM but we just let it fire again later */ |
| 341 | dbus_timeout_handle (timeout); |
| 342 | } |
| 343 | |
| 344 | static dbus_bool_t |
| 345 | add_connection_timeout (DBusTimeout *timeout, |
| 346 | void *data) |
| 347 | { |
| 348 | DBusConnection *connection = data; |
| 349 | |
| 350 | return _dbus_loop_add_timeout (connection_get_loop (connection), |
| 351 | timeout, connection_timeout_callback, connection, NULL); |
| 352 | } |
| 353 | |
| 354 | static void |
| 355 | remove_connection_timeout (DBusTimeout *timeout, |
| 356 | void *data) |
| 357 | { |
| 358 | DBusConnection *connection = data; |
| 359 | |
| 360 | _dbus_loop_remove_timeout (connection_get_loop (connection), |
| 361 | timeout, connection_timeout_callback, connection); |
| 362 | } |
| 363 | |
| 364 | static void |
| 365 | dispatch_status_function (DBusConnection *connection, |
| 366 | DBusDispatchStatus new_status, |
| 367 | void *data) |
| 368 | { |
| 369 | DBusLoop *loop = data; |
| 370 | |
| 371 | if (new_status != DBUS_DISPATCH_COMPLETE) |
| 372 | { |
| 373 | while (!_dbus_loop_queue_dispatch (loop, connection)) |
| 374 | _dbus_wait_for_memory (); |
| 375 | } |
| 376 | } |
| 377 | |
| 378 | static dbus_bool_t |
| 379 | allow_unix_user_function (DBusConnection *connection, |
| 380 | unsigned long uid, |
| 381 | void *data) |
| 382 | { |
| 383 | BusConnectionData *d; |
| 384 | |
| 385 | d = BUS_CONNECTION_DATA (connection); |
| 386 | |
| 387 | _dbus_assert (d != NULL); |
| 388 | |
| 389 | return bus_context_allow_unix_user (d->connections->context, uid); |
| 390 | } |
| 391 | |
| 392 | static void |
| 393 | free_connection_data (void *data) |
| 394 | { |
| 395 | BusConnectionData *d = data; |
| 396 | |
| 397 | /* services_owned should be NULL since we should be disconnected */ |
| 398 | _dbus_assert (d->services_owned == NULL); |
| 399 | _dbus_assert (d->n_services_owned == 0); |
| 400 | /* similarly */ |
| 401 | _dbus_assert (d->transaction_messages == NULL); |
| 402 | |
| 403 | if (d->oom_preallocated) |
| 404 | dbus_connection_free_preallocated_send (d->connection, d->oom_preallocated); |
| 405 | |
| 406 | if (d->oom_message) |
| 407 | dbus_message_unref (d->oom_message); |
| 408 | |
| 409 | if (d->policy) |
| 410 | bus_client_policy_unref (d->policy); |
| 411 | |
| 412 | if (d->selinux_id) |
| 413 | bus_selinux_id_unref (d->selinux_id); |
| 414 | |
| 415 | dbus_free (d->cached_loginfo_string); |
| 416 | |
| 417 | dbus_free (d->name); |
| 418 | |
| 419 | dbus_free (d); |
| 420 | } |
| 421 | |
| 422 | static void |
| 423 | call_timeout_callback (DBusTimeout *timeout, |
| 424 | void *data) |
| 425 | { |
| 426 | /* can return FALSE on OOM but we just let it fire again later */ |
| 427 | dbus_timeout_handle (timeout); |
| 428 | } |
| 429 | |
| 430 | BusConnections* |
| 431 | bus_connections_new (BusContext *context) |
| 432 | { |
| 433 | BusConnections *connections; |
| 434 | |
| 435 | if (!dbus_connection_allocate_data_slot (&connection_data_slot)) |
| 436 | goto failed_0; |
| 437 | |
| 438 | connections = dbus_new0 (BusConnections, 1); |
| 439 | if (connections == NULL) |
| 440 | goto failed_1; |
| 441 | |
| 442 | connections->completed_by_user = _dbus_hash_table_new (DBUS_HASH_UINTPTR, |
| 443 | NULL, NULL); |
| 444 | if (connections->completed_by_user == NULL) |
| 445 | goto failed_2; |
| 446 | |
| 447 | connections->expire_timeout = _dbus_timeout_new (100, /* irrelevant */ |
| 448 | expire_incomplete_timeout, |
| 449 | connections, NULL); |
| 450 | if (connections->expire_timeout == NULL) |
| 451 | goto failed_3; |
| 452 | |
| 453 | _dbus_timeout_set_enabled (connections->expire_timeout, FALSE); |
| 454 | |
| 455 | connections->pending_replies = bus_expire_list_new (bus_context_get_loop (context), |
| 456 | bus_context_get_reply_timeout (context), |
| 457 | bus_pending_reply_expired, |
| 458 | connections); |
| 459 | if (connections->pending_replies == NULL) |
| 460 | goto failed_4; |
| 461 | |
| 462 | if (!_dbus_loop_add_timeout (bus_context_get_loop (context), |
| 463 | connections->expire_timeout, |
| 464 | call_timeout_callback, NULL, NULL)) |
| 465 | goto failed_5; |
| 466 | |
| 467 | connections->refcount = 1; |
| 468 | connections->context = context; |
| 469 | |
| 470 | return connections; |
| 471 | |
| 472 | failed_5: |
| 473 | bus_expire_list_free (connections->pending_replies); |
| 474 | failed_4: |
| 475 | _dbus_timeout_unref (connections->expire_timeout); |
| 476 | failed_3: |
| 477 | _dbus_hash_table_unref (connections->completed_by_user); |
| 478 | failed_2: |
| 479 | dbus_free (connections); |
| 480 | failed_1: |
| 481 | dbus_connection_free_data_slot (&connection_data_slot); |
| 482 | failed_0: |
| 483 | return NULL; |
| 484 | } |
| 485 | |
| 486 | BusConnections * |
| 487 | bus_connections_ref (BusConnections *connections) |
| 488 | { |
| 489 | _dbus_assert (connections->refcount > 0); |
| 490 | connections->refcount += 1; |
| 491 | |
| 492 | return connections; |
| 493 | } |
| 494 | |
| 495 | void |
| 496 | bus_connections_unref (BusConnections *connections) |
| 497 | { |
| 498 | _dbus_assert (connections->refcount > 0); |
| 499 | connections->refcount -= 1; |
| 500 | if (connections->refcount == 0) |
| 501 | { |
| 502 | /* drop all incomplete */ |
| 503 | while (connections->incomplete != NULL) |
| 504 | { |
| 505 | DBusConnection *connection; |
| 506 | |
| 507 | connection = connections->incomplete->data; |
| 508 | |
| 509 | dbus_connection_ref (connection); |
| 510 | dbus_connection_close (connection); |
| 511 | bus_connection_disconnected (connection); |
| 512 | dbus_connection_unref (connection); |
| 513 | } |
| 514 | |
| 515 | _dbus_assert (connections->n_incomplete == 0); |
| 516 | |
| 517 | /* drop all real connections */ |
| 518 | while (connections->completed != NULL) |
| 519 | { |
| 520 | DBusConnection *connection; |
| 521 | |
| 522 | connection = connections->completed->data; |
| 523 | |
| 524 | dbus_connection_ref (connection); |
| 525 | dbus_connection_close (connection); |
| 526 | bus_connection_disconnected (connection); |
| 527 | dbus_connection_unref (connection); |
| 528 | } |
| 529 | |
| 530 | _dbus_assert (connections->n_completed == 0); |
| 531 | |
| 532 | bus_expire_list_free (connections->pending_replies); |
| 533 | |
| 534 | _dbus_loop_remove_timeout (bus_context_get_loop (connections->context), |
| 535 | connections->expire_timeout, |
| 536 | call_timeout_callback, NULL); |
| 537 | |
| 538 | _dbus_timeout_unref (connections->expire_timeout); |
| 539 | |
| 540 | _dbus_hash_table_unref (connections->completed_by_user); |
| 541 | |
| 542 | dbus_free (connections); |
| 543 | |
| 544 | dbus_connection_free_data_slot (&connection_data_slot); |
| 545 | } |
| 546 | } |
| 547 | |
| 548 | /* Used for logging */ |
| 549 | static dbus_bool_t |
| 550 | cache_peer_loginfo_string (BusConnectionData *d, |
| 551 | DBusConnection *connection) |
| 552 | { |
| 553 | DBusString loginfo_buf; |
| 554 | unsigned long uid; |
| 555 | unsigned long pid; |
| 556 | char *windows_sid; |
| 557 | dbus_bool_t prev_added; |
| 558 | |
| 559 | if (!_dbus_string_init (&loginfo_buf)) |
| 560 | return FALSE; |
| 561 | |
| 562 | prev_added = FALSE; |
| 563 | if (dbus_connection_get_unix_user (connection, &uid)) |
| 564 | { |
| 565 | if (!_dbus_string_append_printf (&loginfo_buf, "uid=%ld", uid)) |
| 566 | goto oom; |
| 567 | else |
| 568 | prev_added = TRUE; |
| 569 | } |
| 570 | |
| 571 | if (dbus_connection_get_unix_process_id (connection, &pid)) |
| 572 | { |
| 573 | if (prev_added) |
| 574 | { |
| 575 | if (!_dbus_string_append_byte (&loginfo_buf, ' ')) |
| 576 | goto oom; |
| 577 | } |
| 578 | if (!_dbus_string_append_printf (&loginfo_buf, "pid=%ld comm=\"", pid)) |
| 579 | goto oom; |
| 580 | /* Ignore errors here; we may not have permissions to read the |
| 581 | * proc file. */ |
| 582 | _dbus_command_for_pid (pid, &loginfo_buf, MAX_LOG_COMMAND_LEN, NULL); |
| 583 | if (!_dbus_string_append_byte (&loginfo_buf, '"')) |
| 584 | goto oom; |
| 585 | } |
| 586 | |
| 587 | if (dbus_connection_get_windows_user (connection, &windows_sid)) |
| 588 | { |
| 589 | if (!_dbus_string_append_printf (&loginfo_buf, "sid=\"%s\" ", windows_sid)) |
| 590 | goto oom; |
| 591 | dbus_free (windows_sid); |
| 592 | } |
| 593 | |
| 594 | if (!_dbus_string_steal_data (&loginfo_buf, &(d->cached_loginfo_string))) |
| 595 | goto oom; |
| 596 | |
| 597 | _dbus_string_free (&loginfo_buf); |
| 598 | |
| 599 | return TRUE; |
| 600 | oom: |
| 601 | _dbus_string_free (&loginfo_buf); |
| 602 | return FALSE; |
| 603 | } |
| 604 | |
| 605 | dbus_bool_t |
| 606 | bus_connections_setup_connection (BusConnections *connections, |
| 607 | DBusConnection *connection) |
| 608 | { |
| 609 | |
| 610 | BusConnectionData *d; |
| 611 | dbus_bool_t retval; |
| 612 | DBusError error; |
| 613 | |
| 614 | |
| 615 | d = dbus_new0 (BusConnectionData, 1); |
| 616 | |
| 617 | if (d == NULL) |
| 618 | return FALSE; |
| 619 | |
| 620 | d->connections = connections; |
| 621 | d->connection = connection; |
| 622 | |
| 623 | _dbus_get_current_time (&d->connection_tv_sec, |
| 624 | &d->connection_tv_usec); |
| 625 | |
| 626 | _dbus_assert (connection_data_slot >= 0); |
| 627 | |
| 628 | if (!dbus_connection_set_data (connection, |
| 629 | connection_data_slot, |
| 630 | d, free_connection_data)) |
| 631 | { |
| 632 | dbus_free (d); |
| 633 | return FALSE; |
| 634 | } |
| 635 | |
| 636 | dbus_connection_set_route_peer_messages (connection, TRUE); |
| 637 | |
| 638 | retval = FALSE; |
| 639 | |
| 640 | dbus_error_init (&error); |
| 641 | d->selinux_id = bus_selinux_init_connection_id (connection, |
| 642 | &error); |
| 643 | if (dbus_error_is_set (&error)) |
| 644 | { |
| 645 | /* This is a bit bogus because we pretend all errors |
| 646 | * are OOM; this is done because we know that in bus.c |
| 647 | * an OOM error disconnects the connection, which is |
| 648 | * the same thing we want on any other error. |
| 649 | */ |
| 650 | dbus_error_free (&error); |
| 651 | goto out; |
| 652 | } |
| 653 | |
| 654 | if (!dbus_connection_set_watch_functions (connection, |
| 655 | add_connection_watch, |
| 656 | remove_connection_watch, |
| 657 | NULL, |
| 658 | connection, |
| 659 | NULL)) |
| 660 | goto out; |
| 661 | |
| 662 | if (!dbus_connection_set_timeout_functions (connection, |
| 663 | add_connection_timeout, |
| 664 | remove_connection_timeout, |
| 665 | NULL, |
| 666 | connection, NULL)) |
| 667 | goto out; |
| 668 | |
| 669 | /* For now we don't need to set a Windows user function because |
| 670 | * there are no policies in the config file controlling what |
| 671 | * Windows users can connect. The default 'same user that owns the |
| 672 | * bus can connect' behavior of DBusConnection is fine on Windows. |
| 673 | */ |
| 674 | dbus_connection_set_unix_user_function (connection, |
| 675 | allow_unix_user_function, |
| 676 | NULL, NULL); |
| 677 | |
| 678 | dbus_connection_set_dispatch_status_function (connection, |
| 679 | dispatch_status_function, |
| 680 | bus_context_get_loop (connections->context), |
| 681 | NULL); |
| 682 | |
| 683 | d->link_in_connection_list = _dbus_list_alloc_link (connection); |
| 684 | if (d->link_in_connection_list == NULL) |
| 685 | goto out; |
| 686 | |
| 687 | /* Setup the connection with the dispatcher */ |
| 688 | if (!bus_dispatch_add_connection (connection)) |
| 689 | goto out; |
| 690 | |
| 691 | if (dbus_connection_get_dispatch_status (connection) != DBUS_DISPATCH_COMPLETE) |
| 692 | { |
| 693 | if (!_dbus_loop_queue_dispatch (bus_context_get_loop (connections->context), connection)) |
| 694 | { |
| 695 | bus_dispatch_remove_connection (connection); |
| 696 | goto out; |
| 697 | } |
| 698 | } |
| 699 | |
| 700 | _dbus_list_append_link (&connections->incomplete, d->link_in_connection_list); |
| 701 | connections->n_incomplete += 1; |
| 702 | |
| 703 | dbus_connection_ref (connection); |
| 704 | |
| 705 | /* Note that we might disconnect ourselves here, but it only takes |
| 706 | * effect on return to the main loop. We call this to free up |
| 707 | * expired connections if possible, and to queue the timeout for our |
| 708 | * own expiration. |
| 709 | */ |
| 710 | bus_connections_expire_incomplete (connections); |
| 711 | |
| 712 | /* And we might also disconnect ourselves here, but again it |
| 713 | * only takes effect on return to main loop. |
| 714 | */ |
| 715 | if (connections->n_incomplete > |
| 716 | bus_context_get_max_incomplete_connections (connections->context)) |
| 717 | { |
| 718 | _dbus_verbose ("Number of incomplete connections exceeds max, dropping oldest one\n"); |
| 719 | |
| 720 | _dbus_assert (connections->incomplete != NULL); |
| 721 | /* Disconnect the oldest unauthenticated connection. FIXME |
| 722 | * would it be more secure to drop a *random* connection? This |
| 723 | * algorithm seems to mean that if someone can create new |
| 724 | * connections quickly enough, they can keep anyone else from |
| 725 | * completing authentication. But random may or may not really |
| 726 | * help with that, a more elaborate solution might be required. |
| 727 | */ |
| 728 | dbus_connection_close (connections->incomplete->data); |
| 729 | } |
| 730 | |
| 731 | retval = TRUE; |
| 732 | |
| 733 | out: |
| 734 | if (!retval) |
| 735 | { |
| 736 | if (d->selinux_id) |
| 737 | bus_selinux_id_unref (d->selinux_id); |
| 738 | d->selinux_id = NULL; |
| 739 | |
| 740 | if (!dbus_connection_set_watch_functions (connection, |
| 741 | NULL, NULL, NULL, |
| 742 | connection, |
| 743 | NULL)) |
| 744 | _dbus_assert_not_reached ("setting watch functions to NULL failed"); |
| 745 | |
| 746 | if (!dbus_connection_set_timeout_functions (connection, |
| 747 | NULL, NULL, NULL, |
| 748 | connection, |
| 749 | NULL)) |
| 750 | _dbus_assert_not_reached ("setting timeout functions to NULL failed"); |
| 751 | |
| 752 | dbus_connection_set_unix_user_function (connection, |
| 753 | NULL, NULL, NULL); |
| 754 | |
| 755 | dbus_connection_set_windows_user_function (connection, |
| 756 | NULL, NULL, NULL); |
| 757 | |
| 758 | dbus_connection_set_dispatch_status_function (connection, |
| 759 | NULL, NULL, NULL); |
| 760 | |
| 761 | if (d->link_in_connection_list != NULL) |
| 762 | { |
| 763 | _dbus_assert (d->link_in_connection_list->next == NULL); |
| 764 | _dbus_assert (d->link_in_connection_list->prev == NULL); |
| 765 | _dbus_list_free_link (d->link_in_connection_list); |
| 766 | d->link_in_connection_list = NULL; |
| 767 | } |
| 768 | |
| 769 | if (!dbus_connection_set_data (connection, |
| 770 | connection_data_slot, |
| 771 | NULL, NULL)) |
| 772 | _dbus_assert_not_reached ("failed to set connection data to null"); |
| 773 | |
| 774 | /* "d" has now been freed */ |
| 775 | } |
| 776 | |
| 777 | return retval; |
| 778 | } |
| 779 | |
| 780 | void |
| 781 | bus_connections_expire_incomplete (BusConnections *connections) |
| 782 | { |
| 783 | int next_interval; |
| 784 | |
| 785 | next_interval = -1; |
| 786 | |
| 787 | if (connections->incomplete != NULL) |
| 788 | { |
| 789 | long tv_sec, tv_usec; |
| 790 | DBusList *link; |
| 791 | int auth_timeout; |
| 792 | |
| 793 | _dbus_get_current_time (&tv_sec, &tv_usec); |
| 794 | auth_timeout = bus_context_get_auth_timeout (connections->context); |
| 795 | |
| 796 | link = _dbus_list_get_first_link (&connections->incomplete); |
| 797 | while (link != NULL) |
| 798 | { |
| 799 | DBusList *next = _dbus_list_get_next_link (&connections->incomplete, link); |
| 800 | DBusConnection *connection; |
| 801 | BusConnectionData *d; |
| 802 | double elapsed; |
| 803 | |
| 804 | connection = link->data; |
| 805 | |
| 806 | d = BUS_CONNECTION_DATA (connection); |
| 807 | |
| 808 | _dbus_assert (d != NULL); |
| 809 | |
| 810 | elapsed = ELAPSED_MILLISECONDS_SINCE (d->connection_tv_sec, |
| 811 | d->connection_tv_usec, |
| 812 | tv_sec, tv_usec); |
| 813 | |
| 814 | if (elapsed >= (double) auth_timeout) |
| 815 | { |
| 816 | _dbus_verbose ("Timing out authentication for connection %p\n", connection); |
| 817 | dbus_connection_close (connection); |
| 818 | } |
| 819 | else |
| 820 | { |
| 821 | /* We can end the loop, since the connections are in oldest-first order */ |
| 822 | next_interval = ((double)auth_timeout) - elapsed; |
| 823 | _dbus_verbose ("Connection %p authentication expires in %d milliseconds\n", |
| 824 | connection, next_interval); |
| 825 | |
| 826 | break; |
| 827 | } |
| 828 | |
| 829 | link = next; |
| 830 | } |
| 831 | } |
| 832 | |
| 833 | bus_expire_timeout_set_interval (connections->expire_timeout, |
| 834 | next_interval); |
| 835 | } |
| 836 | |
| 837 | static dbus_bool_t |
| 838 | expire_incomplete_timeout (void *data) |
| 839 | { |
| 840 | BusConnections *connections = data; |
| 841 | |
| 842 | _dbus_verbose ("Running\n"); |
| 843 | |
| 844 | /* note that this may remove the timeout */ |
| 845 | bus_connections_expire_incomplete (connections); |
| 846 | |
| 847 | return TRUE; |
| 848 | } |
| 849 | |
| 850 | dbus_bool_t |
| 851 | bus_connection_get_unix_groups (DBusConnection *connection, |
| 852 | unsigned long **groups, |
| 853 | int *n_groups, |
| 854 | DBusError *error) |
| 855 | { |
| 856 | BusConnectionData *d; |
| 857 | unsigned long uid; |
| 858 | |
| 859 | d = BUS_CONNECTION_DATA (connection); |
| 860 | |
| 861 | _dbus_assert (d != NULL); |
| 862 | |
| 863 | *groups = NULL; |
| 864 | *n_groups = 0; |
| 865 | |
| 866 | if (dbus_connection_get_unix_user (connection, &uid)) |
| 867 | { |
| 868 | if (!_dbus_unix_groups_from_uid (uid, groups, n_groups)) |
| 869 | { |
| 870 | _dbus_verbose ("Did not get any groups for UID %lu\n", |
| 871 | uid); |
| 872 | return FALSE; |
| 873 | } |
| 874 | else |
| 875 | { |
| 876 | _dbus_verbose ("Got %d groups for UID %lu\n", |
| 877 | *n_groups, uid); |
| 878 | return TRUE; |
| 879 | } |
| 880 | } |
| 881 | else |
| 882 | return TRUE; /* successfully got 0 groups */ |
| 883 | } |
| 884 | |
| 885 | dbus_bool_t |
| 886 | bus_connection_is_in_unix_group (DBusConnection *connection, |
| 887 | unsigned long gid) |
| 888 | { |
| 889 | int i; |
| 890 | unsigned long *group_ids; |
| 891 | int n_group_ids; |
| 892 | |
| 893 | if (!bus_connection_get_unix_groups (connection, &group_ids, &n_group_ids, |
| 894 | NULL)) |
| 895 | return FALSE; |
| 896 | |
| 897 | i = 0; |
| 898 | while (i < n_group_ids) |
| 899 | { |
| 900 | if (group_ids[i] == gid) |
| 901 | { |
| 902 | dbus_free (group_ids); |
| 903 | return TRUE; |
| 904 | } |
| 905 | ++i; |
| 906 | } |
| 907 | |
| 908 | dbus_free (group_ids); |
| 909 | return FALSE; |
| 910 | } |
| 911 | |
| 912 | const char * |
| 913 | bus_connection_get_loginfo (DBusConnection *connection) |
| 914 | { |
| 915 | BusConnectionData *d; |
| 916 | |
| 917 | d = BUS_CONNECTION_DATA (connection); |
| 918 | |
| 919 | if (!bus_connection_is_active (connection)) |
| 920 | return "inactive"; |
| 921 | return d->cached_loginfo_string; |
| 922 | } |
| 923 | |
| 924 | BusClientPolicy* |
| 925 | bus_connection_get_policy (DBusConnection *connection) |
| 926 | { |
| 927 | BusConnectionData *d; |
| 928 | |
| 929 | d = BUS_CONNECTION_DATA (connection); |
| 930 | |
| 931 | _dbus_assert (d != NULL); |
| 932 | _dbus_assert (d->policy != NULL); |
| 933 | |
| 934 | return d->policy; |
| 935 | } |
| 936 | |
| 937 | static dbus_bool_t |
| 938 | foreach_active (BusConnections *connections, |
| 939 | BusConnectionForeachFunction function, |
| 940 | void *data) |
| 941 | { |
| 942 | DBusList *link; |
| 943 | |
| 944 | link = _dbus_list_get_first_link (&connections->completed); |
| 945 | while (link != NULL) |
| 946 | { |
| 947 | DBusConnection *connection = link->data; |
| 948 | DBusList *next = _dbus_list_get_next_link (&connections->completed, link); |
| 949 | |
| 950 | if (!(* function) (connection, data)) |
| 951 | return FALSE; |
| 952 | |
| 953 | link = next; |
| 954 | } |
| 955 | |
| 956 | return TRUE; |
| 957 | } |
| 958 | |
| 959 | static dbus_bool_t |
| 960 | foreach_inactive (BusConnections *connections, |
| 961 | BusConnectionForeachFunction function, |
| 962 | void *data) |
| 963 | { |
| 964 | DBusList *link; |
| 965 | |
| 966 | link = _dbus_list_get_first_link (&connections->incomplete); |
| 967 | while (link != NULL) |
| 968 | { |
| 969 | DBusConnection *connection = link->data; |
| 970 | DBusList *next = _dbus_list_get_next_link (&connections->incomplete, link); |
| 971 | |
| 972 | if (!(* function) (connection, data)) |
| 973 | return FALSE; |
| 974 | |
| 975 | link = next; |
| 976 | } |
| 977 | |
| 978 | return TRUE; |
| 979 | } |
| 980 | |
| 981 | /** |
| 982 | * Calls function on each active connection; if the function returns |
| 983 | * #FALSE, stops iterating. Active connections are authenticated |
| 984 | * and have sent a Hello message. |
| 985 | * |
| 986 | * @param connections the connections object |
| 987 | * @param function the function |
| 988 | * @param data data to pass to it as a second arg |
| 989 | */ |
| 990 | void |
| 991 | bus_connections_foreach_active (BusConnections *connections, |
| 992 | BusConnectionForeachFunction function, |
| 993 | void *data) |
| 994 | { |
| 995 | foreach_active (connections, function, data); |
| 996 | } |
| 997 | |
| 998 | /** |
| 999 | * Calls function on each connection; if the function returns |
| 1000 | * #FALSE, stops iterating. |
| 1001 | * |
| 1002 | * @param connections the connections object |
| 1003 | * @param function the function |
| 1004 | * @param data data to pass to it as a second arg |
| 1005 | */ |
| 1006 | void |
| 1007 | bus_connections_foreach (BusConnections *connections, |
| 1008 | BusConnectionForeachFunction function, |
| 1009 | void *data) |
| 1010 | { |
| 1011 | if (!foreach_active (connections, function, data)) |
| 1012 | return; |
| 1013 | |
| 1014 | foreach_inactive (connections, function, data); |
| 1015 | } |
| 1016 | |
| 1017 | BusContext* |
| 1018 | bus_connections_get_context (BusConnections *connections) |
| 1019 | { |
| 1020 | return connections->context; |
| 1021 | } |
| 1022 | |
| 1023 | /* |
| 1024 | * This is used to avoid covering the same connection twice when |
| 1025 | * traversing connections. Note that it assumes we will |
| 1026 | * bus_connection_mark_stamp() each connection at least once per |
| 1027 | * INT_MAX increments of the global stamp, or wraparound would break |
| 1028 | * things. |
| 1029 | */ |
| 1030 | void |
| 1031 | bus_connections_increment_stamp (BusConnections *connections) |
| 1032 | { |
| 1033 | connections->stamp += 1; |
| 1034 | } |
| 1035 | |
| 1036 | /* Mark connection with current stamp, return TRUE if it |
| 1037 | * didn't already have that stamp |
| 1038 | */ |
| 1039 | dbus_bool_t |
| 1040 | bus_connection_mark_stamp (DBusConnection *connection) |
| 1041 | { |
| 1042 | BusConnectionData *d; |
| 1043 | |
| 1044 | d = BUS_CONNECTION_DATA (connection); |
| 1045 | |
| 1046 | _dbus_assert (d != NULL); |
| 1047 | |
| 1048 | if (d->stamp == d->connections->stamp) |
| 1049 | return FALSE; |
| 1050 | else |
| 1051 | { |
| 1052 | d->stamp = d->connections->stamp; |
| 1053 | return TRUE; |
| 1054 | } |
| 1055 | } |
| 1056 | |
| 1057 | BusContext* |
| 1058 | bus_connection_get_context (DBusConnection *connection) |
| 1059 | { |
| 1060 | BusConnectionData *d; |
| 1061 | |
| 1062 | d = BUS_CONNECTION_DATA (connection); |
| 1063 | |
| 1064 | _dbus_assert (d != NULL); |
| 1065 | |
| 1066 | return d->connections->context; |
| 1067 | } |
| 1068 | |
| 1069 | BusConnections* |
| 1070 | bus_connection_get_connections (DBusConnection *connection) |
| 1071 | { |
| 1072 | BusConnectionData *d; |
| 1073 | |
| 1074 | d = BUS_CONNECTION_DATA (connection); |
| 1075 | |
| 1076 | _dbus_assert (d != NULL); |
| 1077 | |
| 1078 | return d->connections; |
| 1079 | } |
| 1080 | |
| 1081 | BusRegistry* |
| 1082 | bus_connection_get_registry (DBusConnection *connection) |
| 1083 | { |
| 1084 | BusConnectionData *d; |
| 1085 | |
| 1086 | d = BUS_CONNECTION_DATA (connection); |
| 1087 | |
| 1088 | _dbus_assert (d != NULL); |
| 1089 | |
| 1090 | return bus_context_get_registry (d->connections->context); |
| 1091 | } |
| 1092 | |
| 1093 | BusActivation* |
| 1094 | bus_connection_get_activation (DBusConnection *connection) |
| 1095 | { |
| 1096 | BusConnectionData *d; |
| 1097 | |
| 1098 | d = BUS_CONNECTION_DATA (connection); |
| 1099 | |
| 1100 | _dbus_assert (d != NULL); |
| 1101 | |
| 1102 | return bus_context_get_activation (d->connections->context); |
| 1103 | } |
| 1104 | |
| 1105 | BusMatchmaker* |
| 1106 | bus_connection_get_matchmaker (DBusConnection *connection) |
| 1107 | { |
| 1108 | BusConnectionData *d; |
| 1109 | |
| 1110 | d = BUS_CONNECTION_DATA (connection); |
| 1111 | |
| 1112 | _dbus_assert (d != NULL); |
| 1113 | |
| 1114 | return bus_context_get_matchmaker (d->connections->context); |
| 1115 | } |
| 1116 | |
| 1117 | BusSELinuxID* |
| 1118 | bus_connection_get_selinux_id (DBusConnection *connection) |
| 1119 | { |
| 1120 | BusConnectionData *d; |
| 1121 | |
| 1122 | d = BUS_CONNECTION_DATA (connection); |
| 1123 | |
| 1124 | _dbus_assert (d != NULL); |
| 1125 | |
| 1126 | return d->selinux_id; |
| 1127 | } |
| 1128 | |
| 1129 | /** |
| 1130 | * Checks whether the connection is registered with the message bus. |
| 1131 | * |
| 1132 | * @param connection the connection |
| 1133 | * @returns #TRUE if we're an active message bus participant |
| 1134 | */ |
| 1135 | dbus_bool_t |
| 1136 | bus_connection_is_active (DBusConnection *connection) |
| 1137 | { |
| 1138 | BusConnectionData *d; |
| 1139 | |
| 1140 | d = BUS_CONNECTION_DATA (connection); |
| 1141 | |
| 1142 | return d != NULL && d->name != NULL; |
| 1143 | } |
| 1144 | |
| 1145 | dbus_bool_t |
| 1146 | bus_connection_preallocate_oom_error (DBusConnection *connection) |
| 1147 | { |
| 1148 | DBusMessage *message; |
| 1149 | DBusPreallocatedSend *preallocated; |
| 1150 | BusConnectionData *d; |
| 1151 | |
| 1152 | d = BUS_CONNECTION_DATA (connection); |
| 1153 | |
| 1154 | _dbus_assert (d != NULL); |
| 1155 | |
| 1156 | if (d->oom_preallocated != NULL) |
| 1157 | return TRUE; |
| 1158 | |
| 1159 | preallocated = dbus_connection_preallocate_send (connection); |
| 1160 | if (preallocated == NULL) |
| 1161 | return FALSE; |
| 1162 | |
| 1163 | message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR); |
| 1164 | |
| 1165 | if (message == NULL) |
| 1166 | { |
| 1167 | dbus_connection_free_preallocated_send (connection, preallocated); |
| 1168 | return FALSE; |
| 1169 | } |
| 1170 | |
| 1171 | /* d->name may be NULL, but that is OK */ |
| 1172 | if (!dbus_message_set_error_name (message, DBUS_ERROR_NO_MEMORY) || |
| 1173 | !dbus_message_set_destination (message, d->name) || |
| 1174 | !dbus_message_set_sender (message, |
| 1175 | DBUS_SERVICE_DBUS)) |
| 1176 | { |
| 1177 | dbus_connection_free_preallocated_send (connection, preallocated); |
| 1178 | dbus_message_unref (message); |
| 1179 | return FALSE; |
| 1180 | } |
| 1181 | |
| 1182 | /* set reply serial to placeholder value just so space is already allocated |
| 1183 | * for it. |
| 1184 | */ |
| 1185 | if (!dbus_message_set_reply_serial (message, 14)) |
| 1186 | { |
| 1187 | dbus_connection_free_preallocated_send (connection, preallocated); |
| 1188 | dbus_message_unref (message); |
| 1189 | return FALSE; |
| 1190 | } |
| 1191 | |
| 1192 | d->oom_message = message; |
| 1193 | d->oom_preallocated = preallocated; |
| 1194 | |
| 1195 | return TRUE; |
| 1196 | } |
| 1197 | |
| 1198 | void |
| 1199 | bus_connection_send_oom_error (DBusConnection *connection, |
| 1200 | DBusMessage *in_reply_to) |
| 1201 | { |
| 1202 | BusConnectionData *d; |
| 1203 | |
| 1204 | d = BUS_CONNECTION_DATA (connection); |
| 1205 | |
| 1206 | _dbus_assert (d != NULL); |
| 1207 | _dbus_assert (d->oom_message != NULL); |
| 1208 | |
| 1209 | /* should always succeed since we set it to a placeholder earlier */ |
| 1210 | if (!dbus_message_set_reply_serial (d->oom_message, |
| 1211 | dbus_message_get_serial (in_reply_to))) |
| 1212 | _dbus_assert_not_reached ("Failed to set reply serial for preallocated oom message"); |
| 1213 | |
| 1214 | _dbus_assert (dbus_message_get_sender (d->oom_message) != NULL); |
| 1215 | |
| 1216 | dbus_connection_send_preallocated (connection, d->oom_preallocated, |
| 1217 | d->oom_message, NULL); |
| 1218 | |
| 1219 | dbus_message_unref (d->oom_message); |
| 1220 | d->oom_message = NULL; |
| 1221 | d->oom_preallocated = NULL; |
| 1222 | } |
| 1223 | |
| 1224 | void |
| 1225 | bus_connection_add_match_rule_link (DBusConnection *connection, |
| 1226 | DBusList *link) |
| 1227 | { |
| 1228 | BusConnectionData *d; |
| 1229 | |
| 1230 | d = BUS_CONNECTION_DATA (connection); |
| 1231 | _dbus_assert (d != NULL); |
| 1232 | |
| 1233 | _dbus_list_append_link (&d->match_rules, link); |
| 1234 | |
| 1235 | d->n_match_rules += 1; |
| 1236 | } |
| 1237 | |
| 1238 | dbus_bool_t |
| 1239 | bus_connection_add_match_rule (DBusConnection *connection, |
| 1240 | BusMatchRule *rule) |
| 1241 | { |
| 1242 | DBusList *link; |
| 1243 | |
| 1244 | link = _dbus_list_alloc_link (rule); |
| 1245 | |
| 1246 | if (link == NULL) |
| 1247 | return FALSE; |
| 1248 | |
| 1249 | bus_connection_add_match_rule_link (connection, link); |
| 1250 | |
| 1251 | return TRUE; |
| 1252 | } |
| 1253 | |
| 1254 | void |
| 1255 | bus_connection_remove_match_rule (DBusConnection *connection, |
| 1256 | BusMatchRule *rule) |
| 1257 | { |
| 1258 | BusConnectionData *d; |
| 1259 | |
| 1260 | d = BUS_CONNECTION_DATA (connection); |
| 1261 | _dbus_assert (d != NULL); |
| 1262 | |
| 1263 | _dbus_list_remove_last (&d->match_rules, rule); |
| 1264 | |
| 1265 | d->n_match_rules -= 1; |
| 1266 | _dbus_assert (d->n_match_rules >= 0); |
| 1267 | } |
| 1268 | |
| 1269 | int |
| 1270 | bus_connection_get_n_match_rules (DBusConnection *connection) |
| 1271 | { |
| 1272 | BusConnectionData *d; |
| 1273 | |
| 1274 | d = BUS_CONNECTION_DATA (connection); |
| 1275 | _dbus_assert (d != NULL); |
| 1276 | |
| 1277 | return d->n_match_rules; |
| 1278 | } |
| 1279 | |
| 1280 | void |
| 1281 | bus_connection_add_owned_service_link (DBusConnection *connection, |
| 1282 | DBusList *link) |
| 1283 | { |
| 1284 | BusConnectionData *d; |
| 1285 | |
| 1286 | d = BUS_CONNECTION_DATA (connection); |
| 1287 | _dbus_assert (d != NULL); |
| 1288 | |
| 1289 | _dbus_list_append_link (&d->services_owned, link); |
| 1290 | |
| 1291 | d->n_services_owned += 1; |
| 1292 | } |
| 1293 | |
| 1294 | dbus_bool_t |
| 1295 | bus_connection_add_owned_service (DBusConnection *connection, |
| 1296 | BusService *service) |
| 1297 | { |
| 1298 | DBusList *link; |
| 1299 | |
| 1300 | link = _dbus_list_alloc_link (service); |
| 1301 | |
| 1302 | if (link == NULL) |
| 1303 | return FALSE; |
| 1304 | |
| 1305 | bus_connection_add_owned_service_link (connection, link); |
| 1306 | |
| 1307 | return TRUE; |
| 1308 | } |
| 1309 | |
| 1310 | void |
| 1311 | bus_connection_remove_owned_service (DBusConnection *connection, |
| 1312 | BusService *service) |
| 1313 | { |
| 1314 | BusConnectionData *d; |
| 1315 | |
| 1316 | d = BUS_CONNECTION_DATA (connection); |
| 1317 | _dbus_assert (d != NULL); |
| 1318 | |
| 1319 | _dbus_list_remove_last (&d->services_owned, service); |
| 1320 | |
| 1321 | d->n_services_owned -= 1; |
| 1322 | _dbus_assert (d->n_services_owned >= 0); |
| 1323 | } |
| 1324 | |
| 1325 | int |
| 1326 | bus_connection_get_n_services_owned (DBusConnection *connection) |
| 1327 | { |
| 1328 | BusConnectionData *d; |
| 1329 | |
| 1330 | d = BUS_CONNECTION_DATA (connection); |
| 1331 | _dbus_assert (d != NULL); |
| 1332 | |
| 1333 | return d->n_services_owned; |
| 1334 | } |
| 1335 | |
| 1336 | dbus_bool_t |
| 1337 | bus_connection_complete (DBusConnection *connection, |
| 1338 | const DBusString *name, |
| 1339 | DBusError *error) |
| 1340 | { |
| 1341 | BusConnectionData *d; |
| 1342 | unsigned long uid; |
| 1343 | |
| 1344 | d = BUS_CONNECTION_DATA (connection); |
| 1345 | _dbus_assert (d != NULL); |
| 1346 | _dbus_assert (d->name == NULL); |
| 1347 | _dbus_assert (d->policy == NULL); |
| 1348 | |
| 1349 | _dbus_assert (!bus_connection_is_active (connection)); |
| 1350 | |
| 1351 | if (!_dbus_string_copy_data (name, &d->name)) |
| 1352 | { |
| 1353 | BUS_SET_OOM (error); |
| 1354 | return FALSE; |
| 1355 | } |
| 1356 | |
| 1357 | _dbus_assert (d->name != NULL); |
| 1358 | |
| 1359 | _dbus_verbose ("Name %s assigned to %p\n", d->name, connection); |
| 1360 | |
| 1361 | d->policy = bus_context_create_client_policy (d->connections->context, |
| 1362 | connection, |
| 1363 | error); |
| 1364 | |
| 1365 | /* we may have a NULL policy on OOM or error getting list of |
| 1366 | * groups for a user. In the latter case we don't handle it so |
| 1367 | * well currently, as it will just keep failing over and over. |
| 1368 | */ |
| 1369 | |
| 1370 | if (d->policy == NULL) |
| 1371 | { |
| 1372 | _dbus_verbose ("Failed to create security policy for connection %p\n", |
| 1373 | connection); |
| 1374 | _DBUS_ASSERT_ERROR_IS_SET (error); |
| 1375 | dbus_free (d->name); |
| 1376 | d->name = NULL; |
| 1377 | return FALSE; |
| 1378 | } |
| 1379 | |
| 1380 | if (dbus_connection_get_unix_user (connection, &uid)) |
| 1381 | { |
| 1382 | if (!adjust_connections_for_uid (d->connections, |
| 1383 | uid, 1)) |
| 1384 | goto fail; |
| 1385 | } |
| 1386 | |
| 1387 | /* Create and cache a string which holds information about the |
| 1388 | * peer process; used for logging purposes. |
| 1389 | */ |
| 1390 | if (!cache_peer_loginfo_string (d, connection)) |
| 1391 | goto fail; |
| 1392 | |
| 1393 | /* Now the connection is active, move it between lists */ |
| 1394 | _dbus_list_unlink (&d->connections->incomplete, |
| 1395 | d->link_in_connection_list); |
| 1396 | d->connections->n_incomplete -= 1; |
| 1397 | _dbus_list_append_link (&d->connections->completed, |
| 1398 | d->link_in_connection_list); |
| 1399 | d->connections->n_completed += 1; |
| 1400 | |
| 1401 | _dbus_assert (d->connections->n_incomplete >= 0); |
| 1402 | _dbus_assert (d->connections->n_completed > 0); |
| 1403 | |
| 1404 | /* See if we can remove the timeout */ |
| 1405 | bus_connections_expire_incomplete (d->connections); |
| 1406 | |
| 1407 | _dbus_assert (bus_connection_is_active (connection)); |
| 1408 | |
| 1409 | return TRUE; |
| 1410 | fail: |
| 1411 | BUS_SET_OOM (error); |
| 1412 | dbus_free (d->name); |
| 1413 | d->name = NULL; |
| 1414 | if (d->policy) |
| 1415 | bus_client_policy_unref (d->policy); |
| 1416 | d->policy = NULL; |
| 1417 | return FALSE; |
| 1418 | } |
| 1419 | |
| 1420 | const char * |
| 1421 | bus_connection_get_name (DBusConnection *connection) |
| 1422 | { |
| 1423 | BusConnectionData *d; |
| 1424 | |
| 1425 | d = BUS_CONNECTION_DATA (connection); |
| 1426 | _dbus_assert (d != NULL); |
| 1427 | |
| 1428 | return d->name; |
| 1429 | } |
| 1430 | |
| 1431 | /** |
| 1432 | * Check whether completing the passed-in connection would |
| 1433 | * exceed limits, and if so set error and return #FALSE |
| 1434 | */ |
| 1435 | dbus_bool_t |
| 1436 | bus_connections_check_limits (BusConnections *connections, |
| 1437 | DBusConnection *requesting_completion, |
| 1438 | DBusError *error) |
| 1439 | { |
| 1440 | BusConnectionData *d; |
| 1441 | unsigned long uid; |
| 1442 | |
| 1443 | d = BUS_CONNECTION_DATA (requesting_completion); |
| 1444 | _dbus_assert (d != NULL); |
| 1445 | |
| 1446 | _dbus_assert (d->name == NULL); |
| 1447 | |
| 1448 | if (connections->n_completed >= |
| 1449 | bus_context_get_max_completed_connections (connections->context)) |
| 1450 | { |
| 1451 | dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED, |
| 1452 | "The maximum number of active connections has been reached"); |
| 1453 | return FALSE; |
| 1454 | } |
| 1455 | |
| 1456 | if (dbus_connection_get_unix_user (requesting_completion, &uid)) |
| 1457 | { |
| 1458 | if (get_connections_for_uid (connections, uid) >= |
| 1459 | bus_context_get_max_connections_per_user (connections->context)) |
| 1460 | { |
| 1461 | dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED, |
| 1462 | "The maximum number of active connections for UID %lu has been reached", |
| 1463 | uid); |
| 1464 | return FALSE; |
| 1465 | } |
| 1466 | } |
| 1467 | |
| 1468 | return TRUE; |
| 1469 | } |
| 1470 | |
| 1471 | static void |
| 1472 | bus_pending_reply_free (BusPendingReply *pending) |
| 1473 | { |
| 1474 | _dbus_verbose ("Freeing pending reply %p, replier %p receiver %p serial %u\n", |
| 1475 | pending, |
| 1476 | pending->will_send_reply, |
| 1477 | pending->will_get_reply, |
| 1478 | pending->reply_serial); |
| 1479 | |
| 1480 | dbus_free (pending); |
| 1481 | } |
| 1482 | |
| 1483 | static dbus_bool_t |
| 1484 | bus_pending_reply_send_no_reply (BusConnections *connections, |
| 1485 | BusTransaction *transaction, |
| 1486 | BusPendingReply *pending) |
| 1487 | { |
| 1488 | DBusMessage *message; |
| 1489 | DBusMessageIter iter; |
| 1490 | dbus_bool_t retval; |
| 1491 | const char *errmsg; |
| 1492 | |
| 1493 | retval = FALSE; |
| 1494 | |
| 1495 | message = dbus_message_new (DBUS_MESSAGE_TYPE_ERROR); |
| 1496 | if (message == NULL) |
| 1497 | return FALSE; |
| 1498 | |
| 1499 | dbus_message_set_no_reply (message, TRUE); |
| 1500 | |
| 1501 | if (!dbus_message_set_reply_serial (message, |
| 1502 | pending->reply_serial)) |
| 1503 | goto out; |
| 1504 | |
| 1505 | if (!dbus_message_set_error_name (message, |
| 1506 | DBUS_ERROR_NO_REPLY)) |
| 1507 | goto out; |
| 1508 | |
| 1509 | errmsg = "Message did not receive a reply (timeout by message bus)"; |
| 1510 | dbus_message_iter_init_append (message, &iter); |
| 1511 | if (!dbus_message_iter_append_basic (&iter, DBUS_TYPE_STRING, &errmsg)) |
| 1512 | goto out; |
| 1513 | |
| 1514 | if (!bus_transaction_send_from_driver (transaction, pending->will_get_reply, |
| 1515 | message)) |
| 1516 | goto out; |
| 1517 | |
| 1518 | retval = TRUE; |
| 1519 | |
| 1520 | out: |
| 1521 | dbus_message_unref (message); |
| 1522 | return retval; |
| 1523 | } |
| 1524 | |
| 1525 | static dbus_bool_t |
| 1526 | bus_pending_reply_expired (BusExpireList *list, |
| 1527 | DBusList *link, |
| 1528 | void *data) |
| 1529 | { |
| 1530 | BusPendingReply *pending = link->data; |
| 1531 | BusConnections *connections = data; |
| 1532 | BusTransaction *transaction; |
| 1533 | |
| 1534 | /* No reply is forthcoming. So nuke it if we can. If not, |
| 1535 | * leave it in the list to try expiring again later when we |
| 1536 | * get more memory. |
| 1537 | */ |
| 1538 | |
| 1539 | _dbus_verbose ("Expiring pending reply %p, replier %p receiver %p serial %u\n", |
| 1540 | pending, |
| 1541 | pending->will_send_reply, |
| 1542 | pending->will_get_reply, |
| 1543 | pending->reply_serial); |
| 1544 | |
| 1545 | transaction = bus_transaction_new (connections->context); |
| 1546 | if (transaction == NULL) |
| 1547 | return FALSE; |
| 1548 | |
| 1549 | if (!bus_pending_reply_send_no_reply (connections, |
| 1550 | transaction, |
| 1551 | pending)) |
| 1552 | { |
| 1553 | bus_transaction_cancel_and_free (transaction); |
| 1554 | return FALSE; |
| 1555 | } |
| 1556 | |
| 1557 | bus_expire_list_remove_link (connections->pending_replies, link); |
| 1558 | |
| 1559 | bus_pending_reply_free (pending); |
| 1560 | bus_transaction_execute_and_free (transaction); |
| 1561 | |
| 1562 | return TRUE; |
| 1563 | } |
| 1564 | |
| 1565 | static void |
| 1566 | bus_connection_drop_pending_replies (BusConnections *connections, |
| 1567 | DBusConnection *connection) |
| 1568 | { |
| 1569 | /* The DBusConnection is almost 100% finalized here, so you can't |
| 1570 | * do anything with it except check for pointer equality |
| 1571 | */ |
| 1572 | DBusList *link; |
| 1573 | |
| 1574 | _dbus_verbose ("Dropping pending replies that involve connection %p\n", |
| 1575 | connection); |
| 1576 | |
| 1577 | link = bus_expire_list_get_first_link (connections->pending_replies); |
| 1578 | while (link != NULL) |
| 1579 | { |
| 1580 | DBusList *next; |
| 1581 | BusPendingReply *pending; |
| 1582 | |
| 1583 | next = bus_expire_list_get_next_link (connections->pending_replies, |
| 1584 | link); |
| 1585 | pending = link->data; |
| 1586 | |
| 1587 | if (pending->will_get_reply == connection) |
| 1588 | { |
| 1589 | /* We don't need to track this pending reply anymore */ |
| 1590 | |
| 1591 | _dbus_verbose ("Dropping pending reply %p, replier %p receiver %p serial %u\n", |
| 1592 | pending, |
| 1593 | pending->will_send_reply, |
| 1594 | pending->will_get_reply, |
| 1595 | pending->reply_serial); |
| 1596 | |
| 1597 | bus_expire_list_remove_link (connections->pending_replies, |
| 1598 | link); |
| 1599 | bus_pending_reply_free (pending); |
| 1600 | } |
| 1601 | else if (pending->will_send_reply == connection) |
| 1602 | { |
| 1603 | /* The reply isn't going to be sent, so set things |
| 1604 | * up so it will be expired right away |
| 1605 | */ |
| 1606 | _dbus_verbose ("Will expire pending reply %p, replier %p receiver %p serial %u\n", |
| 1607 | pending, |
| 1608 | pending->will_send_reply, |
| 1609 | pending->will_get_reply, |
| 1610 | pending->reply_serial); |
| 1611 | |
| 1612 | pending->will_send_reply = NULL; |
| 1613 | pending->expire_item.added_tv_sec = 0; |
| 1614 | pending->expire_item.added_tv_usec = 0; |
| 1615 | |
| 1616 | bus_expire_list_recheck_immediately (connections->pending_replies); |
| 1617 | } |
| 1618 | |
| 1619 | link = next; |
| 1620 | } |
| 1621 | } |
| 1622 | |
| 1623 | |
| 1624 | typedef struct |
| 1625 | { |
| 1626 | BusPendingReply *pending; |
| 1627 | BusConnections *connections; |
| 1628 | } CancelPendingReplyData; |
| 1629 | |
| 1630 | static void |
| 1631 | cancel_pending_reply (void *data) |
| 1632 | { |
| 1633 | CancelPendingReplyData *d = data; |
| 1634 | |
| 1635 | _dbus_verbose ("d = %p\n", d); |
| 1636 | |
| 1637 | if (!bus_expire_list_remove (d->connections->pending_replies, |
| 1638 | &d->pending->expire_item)) |
| 1639 | _dbus_assert_not_reached ("pending reply did not exist to be cancelled"); |
| 1640 | |
| 1641 | bus_pending_reply_free (d->pending); /* since it's been cancelled */ |
| 1642 | } |
| 1643 | |
| 1644 | static void |
| 1645 | cancel_pending_reply_data_free (void *data) |
| 1646 | { |
| 1647 | CancelPendingReplyData *d = data; |
| 1648 | |
| 1649 | _dbus_verbose ("d = %p\n", d); |
| 1650 | |
| 1651 | /* d->pending should be either freed or still |
| 1652 | * in the list of pending replies (owned by someone |
| 1653 | * else) |
| 1654 | */ |
| 1655 | |
| 1656 | dbus_free (d); |
| 1657 | } |
| 1658 | |
| 1659 | /* |
| 1660 | * Record that a reply is allowed; return TRUE on success. |
| 1661 | */ |
| 1662 | dbus_bool_t |
| 1663 | bus_connections_expect_reply (BusConnections *connections, |
| 1664 | BusTransaction *transaction, |
| 1665 | DBusConnection *will_get_reply, |
| 1666 | DBusConnection *will_send_reply, |
| 1667 | DBusMessage *reply_to_this, |
| 1668 | DBusError *error) |
| 1669 | { |
| 1670 | BusPendingReply *pending; |
| 1671 | dbus_uint32_t reply_serial; |
| 1672 | DBusList *link; |
| 1673 | CancelPendingReplyData *cprd; |
| 1674 | int count; |
| 1675 | |
| 1676 | _dbus_assert (will_get_reply != NULL); |
| 1677 | _dbus_assert (will_send_reply != NULL); |
| 1678 | _dbus_assert (reply_to_this != NULL); |
| 1679 | |
| 1680 | if (dbus_message_get_no_reply (reply_to_this)) |
| 1681 | return TRUE; /* we won't allow a reply, since client doesn't care for one. */ |
| 1682 | |
| 1683 | reply_serial = dbus_message_get_serial (reply_to_this); |
| 1684 | |
| 1685 | link = bus_expire_list_get_first_link (connections->pending_replies); |
| 1686 | count = 0; |
| 1687 | while (link != NULL) |
| 1688 | { |
| 1689 | pending = link->data; |
| 1690 | |
| 1691 | if (pending->reply_serial == reply_serial && |
| 1692 | pending->will_get_reply == will_get_reply && |
| 1693 | pending->will_send_reply == will_send_reply) |
| 1694 | { |
| 1695 | dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED, |
| 1696 | "Message has the same reply serial as a currently-outstanding existing method call"); |
| 1697 | return FALSE; |
| 1698 | } |
| 1699 | |
| 1700 | link = bus_expire_list_get_next_link (connections->pending_replies, |
| 1701 | link); |
| 1702 | if (pending->will_get_reply == will_get_reply) |
| 1703 | ++count; |
| 1704 | } |
| 1705 | |
| 1706 | if (count >= |
| 1707 | bus_context_get_max_replies_per_connection (connections->context)) |
| 1708 | { |
| 1709 | dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED, |
| 1710 | "The maximum number of pending replies per connection has been reached"); |
| 1711 | return FALSE; |
| 1712 | } |
| 1713 | |
| 1714 | pending = dbus_new0 (BusPendingReply, 1); |
| 1715 | if (pending == NULL) |
| 1716 | { |
| 1717 | BUS_SET_OOM (error); |
| 1718 | return FALSE; |
| 1719 | } |
| 1720 | |
| 1721 | #ifdef DBUS_ENABLE_VERBOSE_MODE |
| 1722 | /* so we can see a not-yet-added pending reply */ |
| 1723 | pending->expire_item.added_tv_sec = 1; |
| 1724 | pending->expire_item.added_tv_usec = 1; |
| 1725 | #endif |
| 1726 | |
| 1727 | pending->will_get_reply = will_get_reply; |
| 1728 | pending->will_send_reply = will_send_reply; |
| 1729 | pending->reply_serial = reply_serial; |
| 1730 | |
| 1731 | cprd = dbus_new0 (CancelPendingReplyData, 1); |
| 1732 | if (cprd == NULL) |
| 1733 | { |
| 1734 | BUS_SET_OOM (error); |
| 1735 | bus_pending_reply_free (pending); |
| 1736 | return FALSE; |
| 1737 | } |
| 1738 | |
| 1739 | if (!bus_expire_list_add (connections->pending_replies, |
| 1740 | &pending->expire_item)) |
| 1741 | { |
| 1742 | BUS_SET_OOM (error); |
| 1743 | dbus_free (cprd); |
| 1744 | bus_pending_reply_free (pending); |
| 1745 | return FALSE; |
| 1746 | } |
| 1747 | |
| 1748 | if (!bus_transaction_add_cancel_hook (transaction, |
| 1749 | cancel_pending_reply, |
| 1750 | cprd, |
| 1751 | cancel_pending_reply_data_free)) |
| 1752 | { |
| 1753 | BUS_SET_OOM (error); |
| 1754 | bus_expire_list_remove (connections->pending_replies, &pending->expire_item); |
| 1755 | dbus_free (cprd); |
| 1756 | bus_pending_reply_free (pending); |
| 1757 | return FALSE; |
| 1758 | } |
| 1759 | |
| 1760 | cprd->pending = pending; |
| 1761 | cprd->connections = connections; |
| 1762 | |
| 1763 | _dbus_get_current_time (&pending->expire_item.added_tv_sec, |
| 1764 | &pending->expire_item.added_tv_usec); |
| 1765 | |
| 1766 | _dbus_verbose ("Added pending reply %p, replier %p receiver %p serial %u\n", |
| 1767 | pending, |
| 1768 | pending->will_send_reply, |
| 1769 | pending->will_get_reply, |
| 1770 | pending->reply_serial); |
| 1771 | |
| 1772 | return TRUE; |
| 1773 | } |
| 1774 | |
| 1775 | typedef struct |
| 1776 | { |
| 1777 | DBusList *link; |
| 1778 | BusConnections *connections; |
| 1779 | } CheckPendingReplyData; |
| 1780 | |
| 1781 | static void |
| 1782 | cancel_check_pending_reply (void *data) |
| 1783 | { |
| 1784 | CheckPendingReplyData *d = data; |
| 1785 | |
| 1786 | _dbus_verbose ("d = %p\n",d); |
| 1787 | |
| 1788 | bus_expire_list_add_link (d->connections->pending_replies, |
| 1789 | d->link); |
| 1790 | d->link = NULL; |
| 1791 | } |
| 1792 | |
| 1793 | static void |
| 1794 | check_pending_reply_data_free (void *data) |
| 1795 | { |
| 1796 | CheckPendingReplyData *d = data; |
| 1797 | |
| 1798 | _dbus_verbose ("d = %p\n",d); |
| 1799 | |
| 1800 | if (d->link != NULL) |
| 1801 | { |
| 1802 | BusPendingReply *pending = d->link->data; |
| 1803 | |
| 1804 | _dbus_assert (!bus_expire_list_contains_item (d->connections->pending_replies, |
| 1805 | &pending->expire_item)); |
| 1806 | |
| 1807 | bus_pending_reply_free (pending); |
| 1808 | _dbus_list_free_link (d->link); |
| 1809 | } |
| 1810 | |
| 1811 | dbus_free (d); |
| 1812 | } |
| 1813 | |
| 1814 | /* |
| 1815 | * Check whether a reply is allowed, remove BusPendingReply |
| 1816 | * if so, return TRUE if so. |
| 1817 | */ |
| 1818 | dbus_bool_t |
| 1819 | bus_connections_check_reply (BusConnections *connections, |
| 1820 | BusTransaction *transaction, |
| 1821 | DBusConnection *sending_reply, |
| 1822 | DBusConnection *receiving_reply, |
| 1823 | DBusMessage *reply, |
| 1824 | DBusError *error) |
| 1825 | { |
| 1826 | CheckPendingReplyData *cprd; |
| 1827 | DBusList *link; |
| 1828 | dbus_uint32_t reply_serial; |
| 1829 | |
| 1830 | _dbus_assert (sending_reply != NULL); |
| 1831 | _dbus_assert (receiving_reply != NULL); |
| 1832 | |
| 1833 | reply_serial = dbus_message_get_reply_serial (reply); |
| 1834 | |
| 1835 | link = bus_expire_list_get_first_link (connections->pending_replies); |
| 1836 | while (link != NULL) |
| 1837 | { |
| 1838 | BusPendingReply *pending = link->data; |
| 1839 | |
| 1840 | if (pending->reply_serial == reply_serial && |
| 1841 | pending->will_get_reply == receiving_reply && |
| 1842 | pending->will_send_reply == sending_reply) |
| 1843 | { |
| 1844 | _dbus_verbose ("Found pending reply with serial %u\n", reply_serial); |
| 1845 | break; |
| 1846 | } |
| 1847 | |
| 1848 | link = bus_expire_list_get_next_link (connections->pending_replies, |
| 1849 | link); |
| 1850 | } |
| 1851 | |
| 1852 | if (link == NULL) |
| 1853 | { |
| 1854 | _dbus_verbose ("No pending reply expected\n"); |
| 1855 | |
| 1856 | return FALSE; |
| 1857 | } |
| 1858 | |
| 1859 | cprd = dbus_new0 (CheckPendingReplyData, 1); |
| 1860 | if (cprd == NULL) |
| 1861 | { |
| 1862 | BUS_SET_OOM (error); |
| 1863 | return FALSE; |
| 1864 | } |
| 1865 | |
| 1866 | if (!bus_transaction_add_cancel_hook (transaction, |
| 1867 | cancel_check_pending_reply, |
| 1868 | cprd, |
| 1869 | check_pending_reply_data_free)) |
| 1870 | { |
| 1871 | BUS_SET_OOM (error); |
| 1872 | dbus_free (cprd); |
| 1873 | return FALSE; |
| 1874 | } |
| 1875 | |
| 1876 | cprd->link = link; |
| 1877 | cprd->connections = connections; |
| 1878 | |
| 1879 | bus_expire_list_unlink (connections->pending_replies, |
| 1880 | link); |
| 1881 | |
| 1882 | _dbus_assert (!bus_expire_list_contains_item (connections->pending_replies, link->data)); |
| 1883 | |
| 1884 | return TRUE; |
| 1885 | } |
| 1886 | |
| 1887 | /* |
| 1888 | * Transactions |
| 1889 | * |
| 1890 | * Note that this is fairly fragile; in particular, don't try to use |
| 1891 | * one transaction across any main loop iterations. |
| 1892 | */ |
| 1893 | |
| 1894 | typedef struct |
| 1895 | { |
| 1896 | BusTransaction *transaction; |
| 1897 | DBusMessage *message; |
| 1898 | DBusPreallocatedSend *preallocated; |
| 1899 | } MessageToSend; |
| 1900 | |
| 1901 | typedef struct |
| 1902 | { |
| 1903 | BusTransactionCancelFunction cancel_function; |
| 1904 | DBusFreeFunction free_data_function; |
| 1905 | void *data; |
| 1906 | } CancelHook; |
| 1907 | |
| 1908 | struct BusTransaction |
| 1909 | { |
| 1910 | DBusList *connections; |
| 1911 | BusContext *context; |
| 1912 | DBusList *cancel_hooks; |
| 1913 | }; |
| 1914 | |
| 1915 | static void |
| 1916 | message_to_send_free (DBusConnection *connection, |
| 1917 | MessageToSend *to_send) |
| 1918 | { |
| 1919 | if (to_send->message) |
| 1920 | dbus_message_unref (to_send->message); |
| 1921 | |
| 1922 | if (to_send->preallocated) |
| 1923 | dbus_connection_free_preallocated_send (connection, to_send->preallocated); |
| 1924 | |
| 1925 | dbus_free (to_send); |
| 1926 | } |
| 1927 | |
| 1928 | static void |
| 1929 | cancel_hook_cancel (void *element, |
| 1930 | void *data) |
| 1931 | { |
| 1932 | CancelHook *ch = element; |
| 1933 | |
| 1934 | _dbus_verbose ("Running transaction cancel hook\n"); |
| 1935 | |
| 1936 | if (ch->cancel_function) |
| 1937 | (* ch->cancel_function) (ch->data); |
| 1938 | } |
| 1939 | |
| 1940 | static void |
| 1941 | cancel_hook_free (void *element, |
| 1942 | void *data) |
| 1943 | { |
| 1944 | CancelHook *ch = element; |
| 1945 | |
| 1946 | if (ch->free_data_function) |
| 1947 | (* ch->free_data_function) (ch->data); |
| 1948 | |
| 1949 | dbus_free (ch); |
| 1950 | } |
| 1951 | |
| 1952 | static void |
| 1953 | free_cancel_hooks (BusTransaction *transaction) |
| 1954 | { |
| 1955 | _dbus_list_foreach (&transaction->cancel_hooks, |
| 1956 | cancel_hook_free, NULL); |
| 1957 | |
| 1958 | _dbus_list_clear (&transaction->cancel_hooks); |
| 1959 | } |
| 1960 | |
| 1961 | BusTransaction* |
| 1962 | bus_transaction_new (BusContext *context) |
| 1963 | { |
| 1964 | BusTransaction *transaction; |
| 1965 | |
| 1966 | transaction = dbus_new0 (BusTransaction, 1); |
| 1967 | if (transaction == NULL) |
| 1968 | return NULL; |
| 1969 | |
| 1970 | transaction->context = context; |
| 1971 | |
| 1972 | return transaction; |
| 1973 | } |
| 1974 | |
| 1975 | BusContext* |
| 1976 | bus_transaction_get_context (BusTransaction *transaction) |
| 1977 | { |
| 1978 | return transaction->context; |
| 1979 | } |
| 1980 | |
| 1981 | BusConnections* |
| 1982 | bus_transaction_get_connections (BusTransaction *transaction) |
| 1983 | { |
| 1984 | return bus_context_get_connections (transaction->context); |
| 1985 | } |
| 1986 | |
| 1987 | dbus_bool_t |
| 1988 | bus_transaction_send_from_driver (BusTransaction *transaction, |
| 1989 | DBusConnection *connection, |
| 1990 | DBusMessage *message) |
| 1991 | { |
| 1992 | /* We have to set the sender to the driver, and have |
| 1993 | * to check security policy since it was not done in |
| 1994 | * dispatch.c |
| 1995 | */ |
| 1996 | _dbus_verbose ("Sending %s %s %s from driver\n", |
| 1997 | dbus_message_get_interface (message) ? |
| 1998 | dbus_message_get_interface (message) : "(no interface)", |
| 1999 | dbus_message_get_member (message) ? |
| 2000 | dbus_message_get_member (message) : "(no member)", |
| 2001 | dbus_message_get_error_name (message) ? |
| 2002 | dbus_message_get_error_name (message) : "(no error name)"); |
| 2003 | |
| 2004 | if (!dbus_message_set_sender (message, DBUS_SERVICE_DBUS)) |
| 2005 | return FALSE; |
| 2006 | |
| 2007 | if (bus_connection_is_active (connection)) |
| 2008 | { |
| 2009 | if (!dbus_message_set_destination (message, |
| 2010 | bus_connection_get_name (connection))) |
| 2011 | return FALSE; |
| 2012 | } |
| 2013 | |
| 2014 | /* bus driver never wants a reply */ |
| 2015 | dbus_message_set_no_reply (message, TRUE); |
| 2016 | |
| 2017 | /* If security policy doesn't allow the message, we silently |
| 2018 | * eat it; the driver doesn't care about getting a reply. |
| 2019 | */ |
| 2020 | if (!bus_context_check_security_policy (bus_transaction_get_context (transaction), |
| 2021 | transaction, |
| 2022 | NULL, connection, connection, message, NULL)) |
| 2023 | return TRUE; |
| 2024 | |
| 2025 | return bus_transaction_send (transaction, connection, message); |
| 2026 | } |
| 2027 | |
| 2028 | dbus_bool_t |
| 2029 | bus_transaction_send (BusTransaction *transaction, |
| 2030 | DBusConnection *connection, |
| 2031 | DBusMessage *message) |
| 2032 | { |
| 2033 | MessageToSend *to_send; |
| 2034 | BusConnectionData *d; |
| 2035 | DBusList *link; |
| 2036 | |
| 2037 | _dbus_verbose (" trying to add %s interface=%s member=%s error=%s to transaction%s\n", |
| 2038 | dbus_message_get_type (message) == DBUS_MESSAGE_TYPE_ERROR ? "error" : |
| 2039 | dbus_message_get_reply_serial (message) != 0 ? "reply" : |
| 2040 | "message", |
| 2041 | dbus_message_get_interface (message) ? |
| 2042 | dbus_message_get_interface (message) : "(unset)", |
| 2043 | dbus_message_get_member (message) ? |
| 2044 | dbus_message_get_member (message) : "(unset)", |
| 2045 | dbus_message_get_error_name (message) ? |
| 2046 | dbus_message_get_error_name (message) : "(unset)", |
| 2047 | dbus_connection_get_is_connected (connection) ? |
| 2048 | "" : " (disconnected)"); |
| 2049 | |
| 2050 | _dbus_assert (dbus_message_get_sender (message) != NULL); |
| 2051 | |
| 2052 | if (!dbus_connection_get_is_connected (connection)) |
| 2053 | return TRUE; /* silently ignore disconnected connections */ |
| 2054 | |
| 2055 | d = BUS_CONNECTION_DATA (connection); |
| 2056 | _dbus_assert (d != NULL); |
| 2057 | |
| 2058 | to_send = dbus_new (MessageToSend, 1); |
| 2059 | if (to_send == NULL) |
| 2060 | { |
| 2061 | return FALSE; |
| 2062 | } |
| 2063 | |
| 2064 | to_send->preallocated = dbus_connection_preallocate_send (connection); |
| 2065 | if (to_send->preallocated == NULL) |
| 2066 | { |
| 2067 | dbus_free (to_send); |
| 2068 | return FALSE; |
| 2069 | } |
| 2070 | |
| 2071 | dbus_message_ref (message); |
| 2072 | to_send->message = message; |
| 2073 | to_send->transaction = transaction; |
| 2074 | |
| 2075 | _dbus_verbose ("about to prepend message\n"); |
| 2076 | |
| 2077 | if (!_dbus_list_prepend (&d->transaction_messages, to_send)) |
| 2078 | { |
| 2079 | message_to_send_free (connection, to_send); |
| 2080 | return FALSE; |
| 2081 | } |
| 2082 | |
| 2083 | _dbus_verbose ("prepended message\n"); |
| 2084 | |
| 2085 | /* See if we already had this connection in the list |
| 2086 | * for this transaction. If we have a pending message, |
| 2087 | * then we should already be in transaction->connections |
| 2088 | */ |
| 2089 | link = _dbus_list_get_first_link (&d->transaction_messages); |
| 2090 | _dbus_assert (link->data == to_send); |
| 2091 | link = _dbus_list_get_next_link (&d->transaction_messages, link); |
| 2092 | while (link != NULL) |
| 2093 | { |
| 2094 | MessageToSend *m = link->data; |
| 2095 | DBusList *next = _dbus_list_get_next_link (&d->transaction_messages, link); |
| 2096 | |
| 2097 | if (m->transaction == transaction) |
| 2098 | break; |
| 2099 | |
| 2100 | link = next; |
| 2101 | } |
| 2102 | |
| 2103 | if (link == NULL) |
| 2104 | { |
| 2105 | if (!_dbus_list_prepend (&transaction->connections, connection)) |
| 2106 | { |
| 2107 | _dbus_list_remove (&d->transaction_messages, to_send); |
| 2108 | message_to_send_free (connection, to_send); |
| 2109 | return FALSE; |
| 2110 | } |
| 2111 | } |
| 2112 | |
| 2113 | return TRUE; |
| 2114 | } |
| 2115 | |
| 2116 | static void |
| 2117 | connection_cancel_transaction (DBusConnection *connection, |
| 2118 | BusTransaction *transaction) |
| 2119 | { |
| 2120 | DBusList *link; |
| 2121 | BusConnectionData *d; |
| 2122 | |
| 2123 | d = BUS_CONNECTION_DATA (connection); |
| 2124 | _dbus_assert (d != NULL); |
| 2125 | |
| 2126 | link = _dbus_list_get_first_link (&d->transaction_messages); |
| 2127 | while (link != NULL) |
| 2128 | { |
| 2129 | MessageToSend *m = link->data; |
| 2130 | DBusList *next = _dbus_list_get_next_link (&d->transaction_messages, link); |
| 2131 | |
| 2132 | if (m->transaction == transaction) |
| 2133 | { |
| 2134 | _dbus_list_remove_link (&d->transaction_messages, |
| 2135 | link); |
| 2136 | |
| 2137 | message_to_send_free (connection, m); |
| 2138 | } |
| 2139 | |
| 2140 | link = next; |
| 2141 | } |
| 2142 | } |
| 2143 | |
| 2144 | void |
| 2145 | bus_transaction_cancel_and_free (BusTransaction *transaction) |
| 2146 | { |
| 2147 | DBusConnection *connection; |
| 2148 | |
| 2149 | _dbus_verbose ("TRANSACTION: cancelled\n"); |
| 2150 | |
| 2151 | while ((connection = _dbus_list_pop_first (&transaction->connections))) |
| 2152 | connection_cancel_transaction (connection, transaction); |
| 2153 | |
| 2154 | _dbus_assert (transaction->connections == NULL); |
| 2155 | |
| 2156 | _dbus_list_foreach (&transaction->cancel_hooks, |
| 2157 | cancel_hook_cancel, NULL); |
| 2158 | |
| 2159 | free_cancel_hooks (transaction); |
| 2160 | |
| 2161 | dbus_free (transaction); |
| 2162 | } |
| 2163 | |
| 2164 | static void |
| 2165 | connection_execute_transaction (DBusConnection *connection, |
| 2166 | BusTransaction *transaction) |
| 2167 | { |
| 2168 | DBusList *link; |
| 2169 | BusConnectionData *d; |
| 2170 | |
| 2171 | d = BUS_CONNECTION_DATA (connection); |
| 2172 | _dbus_assert (d != NULL); |
| 2173 | |
| 2174 | /* Send the queue in order (FIFO) */ |
| 2175 | link = _dbus_list_get_last_link (&d->transaction_messages); |
| 2176 | while (link != NULL) |
| 2177 | { |
| 2178 | MessageToSend *m = link->data; |
| 2179 | DBusList *prev = _dbus_list_get_prev_link (&d->transaction_messages, link); |
| 2180 | |
| 2181 | if (m->transaction == transaction) |
| 2182 | { |
| 2183 | _dbus_list_remove_link (&d->transaction_messages, |
| 2184 | link); |
| 2185 | |
| 2186 | _dbus_assert (dbus_message_get_sender (m->message) != NULL); |
| 2187 | |
| 2188 | dbus_connection_send_preallocated (connection, |
| 2189 | m->preallocated, |
| 2190 | m->message, |
| 2191 | NULL); |
| 2192 | |
| 2193 | m->preallocated = NULL; /* so we don't double-free it */ |
| 2194 | |
| 2195 | message_to_send_free (connection, m); |
| 2196 | } |
| 2197 | |
| 2198 | link = prev; |
| 2199 | } |
| 2200 | } |
| 2201 | |
| 2202 | void |
| 2203 | bus_transaction_execute_and_free (BusTransaction *transaction) |
| 2204 | { |
| 2205 | /* For each connection in transaction->connections |
| 2206 | * send the messages |
| 2207 | */ |
| 2208 | DBusConnection *connection; |
| 2209 | |
| 2210 | _dbus_verbose ("TRANSACTION: executing\n"); |
| 2211 | |
| 2212 | while ((connection = _dbus_list_pop_first (&transaction->connections))) |
| 2213 | connection_execute_transaction (connection, transaction); |
| 2214 | |
| 2215 | _dbus_assert (transaction->connections == NULL); |
| 2216 | |
| 2217 | free_cancel_hooks (transaction); |
| 2218 | |
| 2219 | dbus_free (transaction); |
| 2220 | } |
| 2221 | |
| 2222 | static void |
| 2223 | bus_connection_remove_transactions (DBusConnection *connection) |
| 2224 | { |
| 2225 | MessageToSend *to_send; |
| 2226 | BusConnectionData *d; |
| 2227 | |
| 2228 | d = BUS_CONNECTION_DATA (connection); |
| 2229 | _dbus_assert (d != NULL); |
| 2230 | |
| 2231 | while ((to_send = _dbus_list_get_first (&d->transaction_messages))) |
| 2232 | { |
| 2233 | /* only has an effect for the first MessageToSend listing this transaction */ |
| 2234 | _dbus_list_remove (&to_send->transaction->connections, |
| 2235 | connection); |
| 2236 | |
| 2237 | _dbus_list_remove (&d->transaction_messages, to_send); |
| 2238 | message_to_send_free (connection, to_send); |
| 2239 | } |
| 2240 | } |
| 2241 | |
| 2242 | /** |
| 2243 | * Converts the DBusError to a message reply |
| 2244 | */ |
| 2245 | dbus_bool_t |
| 2246 | bus_transaction_send_error_reply (BusTransaction *transaction, |
| 2247 | DBusConnection *connection, |
| 2248 | const DBusError *error, |
| 2249 | DBusMessage *in_reply_to) |
| 2250 | { |
| 2251 | DBusMessage *reply; |
| 2252 | |
| 2253 | _dbus_assert (error != NULL); |
| 2254 | _DBUS_ASSERT_ERROR_IS_SET (error); |
| 2255 | |
| 2256 | _dbus_verbose ("Sending error reply %s \"%s\"\n", |
| 2257 | error->name, error->message); |
| 2258 | |
| 2259 | reply = dbus_message_new_error (in_reply_to, |
| 2260 | error->name, |
| 2261 | error->message); |
| 2262 | if (reply == NULL) |
| 2263 | return FALSE; |
| 2264 | |
| 2265 | if (!bus_transaction_send_from_driver (transaction, connection, reply)) |
| 2266 | { |
| 2267 | dbus_message_unref (reply); |
| 2268 | return FALSE; |
| 2269 | } |
| 2270 | |
| 2271 | dbus_message_unref (reply); |
| 2272 | |
| 2273 | return TRUE; |
| 2274 | } |
| 2275 | |
| 2276 | dbus_bool_t |
| 2277 | bus_transaction_add_cancel_hook (BusTransaction *transaction, |
| 2278 | BusTransactionCancelFunction cancel_function, |
| 2279 | void *data, |
| 2280 | DBusFreeFunction free_data_function) |
| 2281 | { |
| 2282 | CancelHook *ch; |
| 2283 | |
| 2284 | ch = dbus_new (CancelHook, 1); |
| 2285 | if (ch == NULL) |
| 2286 | return FALSE; |
| 2287 | |
| 2288 | _dbus_verbose (" adding cancel hook function = %p data = %p\n", |
| 2289 | cancel_function, data); |
| 2290 | |
| 2291 | ch->cancel_function = cancel_function; |
| 2292 | ch->data = data; |
| 2293 | ch->free_data_function = free_data_function; |
| 2294 | |
| 2295 | /* It's important that the hooks get run in reverse order that they |
| 2296 | * were added |
| 2297 | */ |
| 2298 | if (!_dbus_list_prepend (&transaction->cancel_hooks, ch)) |
| 2299 | { |
| 2300 | dbus_free (ch); |
| 2301 | return FALSE; |
| 2302 | } |
| 2303 | |
| 2304 | return TRUE; |
| 2305 | } |