1 /* SPDX-License-Identifier: LGPL-2.1+ */
5 This file is part of systemd.
7 Copyright 2013 Lennart Poettering
9 systemd is free software; you can redistribute it and/or modify it
10 under the terms of the GNU Lesser General Public License as published by
11 the Free Software Foundation; either version 2.1 of the License, or
12 (at your option) any later version.
14 systemd is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Lesser General Public License for more details.
19 You should have received a copy of the GNU Lesser General Public License
20 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 #include <sys/socket.h>
28 #include "bus-error.h"
29 #include "bus-kernel.h"
30 #include "bus-match.h"
36 #include "socket-util.h"
39 struct reply_callback {
40 sd_bus_message_handler_t callback;
41 usec_t timeout_usec; /* this is a relative timeout until we reach the BUS_HELLO state, and an absolute one right after */
46 struct filter_callback {
47 sd_bus_message_handler_t callback;
49 unsigned last_iteration;
51 LIST_FIELDS(struct filter_callback, callbacks);
54 struct match_callback {
55 sd_bus_message_handler_t callback;
56 sd_bus_message_handler_t install_callback;
58 sd_bus_slot *install_slot; /* The AddMatch() call */
60 unsigned last_iteration;
64 struct bus_match_node *match_node;
70 LIST_HEAD(struct node, child);
71 LIST_FIELDS(struct node, siblings);
73 LIST_HEAD(struct node_callback, callbacks);
74 LIST_HEAD(struct node_vtable, vtables);
75 LIST_HEAD(struct node_enumerator, enumerators);
76 LIST_HEAD(struct node_object_manager, object_managers);
79 struct node_callback {
83 sd_bus_message_handler_t callback;
85 unsigned last_iteration;
87 LIST_FIELDS(struct node_callback, callbacks);
90 struct node_enumerator {
93 sd_bus_node_enumerator_t callback;
95 unsigned last_iteration;
97 LIST_FIELDS(struct node_enumerator, enumerators);
100 struct node_object_manager {
103 LIST_FIELDS(struct node_object_manager, object_managers);
111 const sd_bus_vtable *vtable;
112 sd_bus_object_find_t find;
114 unsigned last_iteration;
116 LIST_FIELDS(struct node_vtable, vtables);
119 struct vtable_member {
121 const char *interface;
123 struct node_vtable *parent;
124 unsigned last_iteration;
125 const sd_bus_vtable *vtable;
128 typedef enum BusSlotType {
135 BUS_NODE_OBJECT_MANAGER,
136 _BUS_SLOT_INVALID = -1,
148 LIST_FIELDS(sd_bus_slot, slots);
151 struct reply_callback reply_callback;
152 struct filter_callback filter_callback;
153 struct match_callback match_callback;
154 struct node_callback node_callback;
155 struct node_enumerator node_enumerator;
156 struct node_object_manager node_object_manager;
157 struct node_vtable node_vtable;
163 BUS_WATCH_BIND, /* waiting for the socket to appear via inotify */
164 BUS_OPENING, /* the kernel's connect() is still not ready */
165 BUS_AUTHENTICATING, /* we are currently in the "SASL" authorization phase of dbus */
166 BUS_HELLO, /* we are waiting for the Hello() response */
173 static inline bool BUS_IS_OPEN(enum bus_state state) {
174 return state > BUS_UNSET && state < BUS_CLOSING;
184 /* We use atomic ref counting here since sd_bus_message
185 objects retain references to their originating sd_bus but
186 we want to allow them to be processed in a different
187 thread. We won't provide full thread safety, but only the
188 bare minimum that makes it possible to use sd_bus and
189 sd_bus_message objects independently and on different
190 threads as long as each object is used only once at the
194 enum bus_state state;
195 int input_fd, output_fd;
204 bool anonymous_auth:1;
206 bool prefer_writev:1;
207 bool match_callbacks_modified:1;
208 bool filter_callbacks_modified:1;
209 bool nodes_modified:1;
211 bool manual_peer_interface:1;
214 bool allow_interactive_authorization:1;
215 bool exit_on_disconnect:1;
217 bool exit_triggered:1;
222 bool attach_timestamp:1;
223 bool connected_signal:1;
230 sd_bus_message **rqueue;
231 unsigned rqueue_size;
232 size_t rqueue_allocated;
234 sd_bus_message **wqueue;
235 unsigned wqueue_size;
237 size_t wqueue_allocated;
244 struct bus_match_node match_callbacks;
245 Prioq *reply_callbacks_prioq;
246 OrderedHashmap *reply_callbacks;
247 LIST_HEAD(struct filter_callback, filter_callbacks);
250 Hashmap *vtable_methods;
251 Hashmap *vtable_properties;
253 union sockaddr_union sockaddr;
254 socklen_t sockaddr_size;
259 sd_id128_t server_id;
262 unsigned address_index;
264 int last_connect_error;
268 struct iovec auth_iovec[3];
286 unsigned iteration_counter;
288 /* We do locking around the memfd cache, since we want to
289 * allow people to process a sd_bus_message in a different
290 * thread then it was generated on and free it there. Since
291 * adding something to the memfd cache might happen when a
292 * message is released, we hence need to protect this bit with
294 pthread_mutex_t memfd_cache_mutex;
295 struct memfd_cache memfd_cache[MEMFD_CACHE_MAX];
296 unsigned n_memfd_cache;
300 sd_event_source *input_io_event_source;
301 sd_event_source *output_io_event_source;
302 sd_event_source *time_event_source;
303 sd_event_source *quit_event_source;
304 sd_event_source *inotify_event_source;
308 sd_bus_message *current_message;
309 sd_bus_slot *current_slot;
310 sd_bus_message_handler_t current_handler;
311 void *current_userdata;
313 sd_bus **default_bus_ptr;
320 sd_bus_track *track_queue;
322 LIST_HEAD(sd_bus_slot, slots);
323 LIST_HEAD(sd_bus_track, tracks);
325 int *inotify_watches;
326 size_t n_inotify_watches;
329 /* For method calls we time-out at 25s, like in the D-Bus reference implementation */
330 #define BUS_DEFAULT_TIMEOUT ((usec_t) (25 * USEC_PER_SEC))
332 /* For the authentication phase we grant 90s, to provide extra room during boot, when RNGs and such are not filled up
333 * with enough entropy yet and might delay the boot */
334 #define BUS_AUTH_TIMEOUT ((usec_t) DEFAULT_TIMEOUT_USEC)
336 #define BUS_WQUEUE_MAX (192*1024)
337 #define BUS_RQUEUE_MAX (192*1024)
339 #define BUS_MESSAGE_SIZE_MAX (64*1024*1024)
340 #define BUS_AUTH_SIZE_MAX (64*1024)
342 #define BUS_CONTAINER_DEPTH 128
344 /* Defined by the specification as maximum size of an array in
346 #define BUS_ARRAY_MAX_SIZE 67108864
348 #define BUS_FDS_MAX 1024
350 #define BUS_EXEC_ARGV_MAX 256
352 bool interface_name_is_valid(const char *p) _pure_;
353 bool service_name_is_valid(const char *p) _pure_;
354 #if 0 /// UNNEEDED by elogind
355 char* service_name_startswith(const char *a, const char *b);
357 bool member_name_is_valid(const char *p) _pure_;
358 bool object_path_is_valid(const char *p) _pure_;
359 char *object_path_startswith(const char *a, const char *b) _pure_;
361 bool namespace_complex_pattern(const char *pattern, const char *value) _pure_;
362 bool path_complex_pattern(const char *pattern, const char *value) _pure_;
364 bool namespace_simple_pattern(const char *pattern, const char *value) _pure_;
365 bool path_simple_pattern(const char *pattern, const char *value) _pure_;
367 int bus_message_type_from_string(const char *s, uint8_t *u) _pure_;
368 const char *bus_message_type_to_string(uint8_t u) _pure_;
370 #define error_name_is_valid interface_name_is_valid
372 int bus_ensure_running(sd_bus *bus);
373 int bus_start_running(sd_bus *bus);
374 int bus_next_address(sd_bus *bus);
376 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m);
378 int bus_rqueue_make_room(sd_bus *bus);
380 bool bus_pid_changed(sd_bus *bus);
382 char *bus_address_escape(const char *v);
384 int bus_attach_io_events(sd_bus *b);
385 int bus_attach_inotify_event(sd_bus *b);
387 void bus_close_inotify_fd(sd_bus *b);
388 void bus_close_io_fds(sd_bus *b);
390 #define OBJECT_PATH_FOREACH_PREFIX(prefix, path) \
391 for (char *_slash = ({ strcpy((prefix), (path)); streq((prefix), "/") ? NULL : strrchr((prefix), '/'); }) ; \
392 _slash && !(_slash[(_slash) == (prefix)] = 0); \
393 _slash = streq((prefix), "/") ? NULL : strrchr((prefix), '/'))
395 /* If we are invoking callbacks of a bus object, ensure unreffing the
396 * bus from the callback doesn't destroy the object we are working
398 #define BUS_DONT_DESTROY(bus) \
399 _cleanup_(sd_bus_unrefp) _unused_ sd_bus *_dont_destroy_##bus = sd_bus_ref(bus)
401 int bus_set_address_system(sd_bus *bus);
402 #if 0 /// UNNEEDED by elogind
403 int bus_set_address_user(sd_bus *bus);
405 int bus_set_address_system_remote(sd_bus *b, const char *host);
406 int bus_set_address_system_machine(sd_bus *b, const char *machine);
408 #if 0 /// UNNEEDED by elogind
410 int bus_get_root_path(sd_bus *bus);
412 int bus_maybe_reply_error(sd_bus_message *m, int r, sd_bus_error *error);
414 #define bus_assert_return(expr, r, error) \
416 if (!assert_log(expr, #expr)) \
417 return sd_bus_error_set_errno(error, r); \
420 void bus_enter_closing(sd_bus *bus);
422 void bus_set_state(sd_bus *bus, enum bus_state state);