1 /* SPDX-License-Identifier: LGPL-2.1+ */
5 Copyright 2013 Lennart Poettering
9 #include <sys/socket.h>
13 #include "bus-error.h"
14 #include "bus-kernel.h"
15 #include "bus-match.h"
21 #include "socket-util.h"
24 struct reply_callback {
25 sd_bus_message_handler_t callback;
26 usec_t timeout_usec; /* this is a relative timeout until we reach the BUS_HELLO state, and an absolute one right after */
31 struct filter_callback {
32 sd_bus_message_handler_t callback;
34 unsigned last_iteration;
36 LIST_FIELDS(struct filter_callback, callbacks);
39 struct match_callback {
40 sd_bus_message_handler_t callback;
41 sd_bus_message_handler_t install_callback;
43 sd_bus_slot *install_slot; /* The AddMatch() call */
45 unsigned last_iteration;
49 struct bus_match_node *match_node;
55 LIST_HEAD(struct node, child);
56 LIST_FIELDS(struct node, siblings);
58 LIST_HEAD(struct node_callback, callbacks);
59 LIST_HEAD(struct node_vtable, vtables);
60 LIST_HEAD(struct node_enumerator, enumerators);
61 LIST_HEAD(struct node_object_manager, object_managers);
64 struct node_callback {
68 sd_bus_message_handler_t callback;
70 unsigned last_iteration;
72 LIST_FIELDS(struct node_callback, callbacks);
75 struct node_enumerator {
78 sd_bus_node_enumerator_t callback;
80 unsigned last_iteration;
82 LIST_FIELDS(struct node_enumerator, enumerators);
85 struct node_object_manager {
88 LIST_FIELDS(struct node_object_manager, object_managers);
96 const sd_bus_vtable *vtable;
97 sd_bus_object_find_t find;
99 unsigned last_iteration;
101 LIST_FIELDS(struct node_vtable, vtables);
104 struct vtable_member {
106 const char *interface;
108 struct node_vtable *parent;
109 unsigned last_iteration;
110 const sd_bus_vtable *vtable;
113 typedef enum BusSlotType {
120 BUS_NODE_OBJECT_MANAGER,
121 _BUS_SLOT_INVALID = -1,
128 sd_bus_destroy_t destroy_callback;
131 /* Slots can be "floating" or not. If they are not floating (the usual case) then they reference the bus object
132 * they are associated with. This means the bus object stays allocated at least as long as there is a slot
133 * around associated with it. If it is floating, then the slot's lifecycle is bound to the lifecycle of the
134 * bus: it will be disconnected from the bus when the bus is destroyed, and it keeping the slot reffed hence
135 * won't mean the bus stays reffed too. Internally this means the reference direction is reversed: floating
136 * slots objects are referenced by the bus object, and not vice versa. */
142 LIST_FIELDS(sd_bus_slot, slots);
145 struct reply_callback reply_callback;
146 struct filter_callback filter_callback;
147 struct match_callback match_callback;
148 struct node_callback node_callback;
149 struct node_enumerator node_enumerator;
150 struct node_object_manager node_object_manager;
151 struct node_vtable node_vtable;
157 BUS_WATCH_BIND, /* waiting for the socket to appear via inotify */
158 BUS_OPENING, /* the kernel's connect() is still not ready */
159 BUS_AUTHENTICATING, /* we are currently in the "SASL" authorization phase of dbus */
160 BUS_HELLO, /* we are waiting for the Hello() response */
167 static inline bool BUS_IS_OPEN(enum bus_state state) {
168 return state > BUS_UNSET && state < BUS_CLOSING;
178 /* We use atomic ref counting here since sd_bus_message
179 objects retain references to their originating sd_bus but
180 we want to allow them to be processed in a different
181 thread. We won't provide full thread safety, but only the
182 bare minimum that makes it possible to use sd_bus and
183 sd_bus_message objects independently and on different
184 threads as long as each object is used only once at the
188 enum bus_state state;
189 int input_fd, output_fd;
198 bool anonymous_auth:1;
200 bool prefer_writev:1;
201 bool match_callbacks_modified:1;
202 bool filter_callbacks_modified:1;
203 bool nodes_modified:1;
205 bool manual_peer_interface:1;
208 bool allow_interactive_authorization:1;
209 bool exit_on_disconnect:1;
211 bool exit_triggered:1;
216 bool attach_timestamp:1;
217 bool connected_signal:1;
224 sd_bus_message **rqueue;
225 unsigned rqueue_size;
226 size_t rqueue_allocated;
228 sd_bus_message **wqueue;
229 unsigned wqueue_size;
231 size_t wqueue_allocated;
238 struct bus_match_node match_callbacks;
239 Prioq *reply_callbacks_prioq;
240 OrderedHashmap *reply_callbacks;
241 LIST_HEAD(struct filter_callback, filter_callbacks);
244 Hashmap *vtable_methods;
245 Hashmap *vtable_properties;
247 union sockaddr_union sockaddr;
248 socklen_t sockaddr_size;
253 sd_id128_t server_id;
256 unsigned address_index;
258 int last_connect_error;
262 struct iovec auth_iovec[3];
280 unsigned iteration_counter;
282 /* We do locking around the memfd cache, since we want to
283 * allow people to process a sd_bus_message in a different
284 * thread then it was generated on and free it there. Since
285 * adding something to the memfd cache might happen when a
286 * message is released, we hence need to protect this bit with
288 pthread_mutex_t memfd_cache_mutex;
289 struct memfd_cache memfd_cache[MEMFD_CACHE_MAX];
290 unsigned n_memfd_cache;
295 sd_event_source *input_io_event_source;
296 sd_event_source *output_io_event_source;
297 sd_event_source *time_event_source;
298 sd_event_source *quit_event_source;
299 sd_event_source *inotify_event_source;
303 sd_bus_message *current_message;
304 sd_bus_slot *current_slot;
305 sd_bus_message_handler_t current_handler;
306 void *current_userdata;
308 sd_bus **default_bus_ptr;
316 sd_bus_track *track_queue;
318 LIST_HEAD(sd_bus_slot, slots);
319 LIST_HEAD(sd_bus_track, tracks);
321 int *inotify_watches;
322 size_t n_inotify_watches;
325 /* For method calls we time-out at 25s, like in the D-Bus reference implementation */
326 #define BUS_DEFAULT_TIMEOUT ((usec_t) (25 * USEC_PER_SEC))
328 /* For the authentication phase we grant 90s, to provide extra room during boot, when RNGs and such are not filled up
329 * with enough entropy yet and might delay the boot */
330 #define BUS_AUTH_TIMEOUT ((usec_t) DEFAULT_TIMEOUT_USEC)
332 #define BUS_WQUEUE_MAX (192*1024)
333 #define BUS_RQUEUE_MAX (192*1024)
335 #define BUS_MESSAGE_SIZE_MAX (128*1024*1024)
336 #define BUS_AUTH_SIZE_MAX (64*1024)
338 #define BUS_CONTAINER_DEPTH 128
340 /* Defined by the specification as maximum size of an array in
342 #define BUS_ARRAY_MAX_SIZE 67108864
344 #define BUS_FDS_MAX 1024
346 #define BUS_EXEC_ARGV_MAX 256
348 bool interface_name_is_valid(const char *p) _pure_;
349 bool service_name_is_valid(const char *p) _pure_;
350 #if 0 /// UNNEEDED by elogind
351 char* service_name_startswith(const char *a, const char *b);
353 bool member_name_is_valid(const char *p) _pure_;
354 bool object_path_is_valid(const char *p) _pure_;
355 char *object_path_startswith(const char *a, const char *b) _pure_;
357 bool namespace_complex_pattern(const char *pattern, const char *value) _pure_;
358 bool path_complex_pattern(const char *pattern, const char *value) _pure_;
360 bool namespace_simple_pattern(const char *pattern, const char *value) _pure_;
361 bool path_simple_pattern(const char *pattern, const char *value) _pure_;
363 int bus_message_type_from_string(const char *s, uint8_t *u) _pure_;
364 const char *bus_message_type_to_string(uint8_t u) _pure_;
366 #define error_name_is_valid interface_name_is_valid
368 sd_bus *bus_resolve(sd_bus *bus);
370 int bus_ensure_running(sd_bus *bus);
371 int bus_start_running(sd_bus *bus);
372 int bus_next_address(sd_bus *bus);
374 int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m);
376 int bus_rqueue_make_room(sd_bus *bus);
378 bool bus_pid_changed(sd_bus *bus);
380 char *bus_address_escape(const char *v);
382 int bus_attach_io_events(sd_bus *b);
383 int bus_attach_inotify_event(sd_bus *b);
385 void bus_close_inotify_fd(sd_bus *b);
386 void bus_close_io_fds(sd_bus *b);
388 #define OBJECT_PATH_FOREACH_PREFIX(prefix, path) \
389 for (char *_slash = ({ strcpy((prefix), (path)); streq((prefix), "/") ? NULL : strrchr((prefix), '/'); }) ; \
390 _slash && !(_slash[(_slash) == (prefix)] = 0); \
391 _slash = streq((prefix), "/") ? NULL : strrchr((prefix), '/'))
393 /* If we are invoking callbacks of a bus object, ensure unreffing the
394 * bus from the callback doesn't destroy the object we are working
396 #define BUS_DONT_DESTROY(bus) \
397 _cleanup_(sd_bus_unrefp) _unused_ sd_bus *_dont_destroy_##bus = sd_bus_ref(bus)
399 int bus_set_address_system(sd_bus *bus);
400 #if 0 /// UNNEEDED by elogind
401 int bus_set_address_user(sd_bus *bus);
403 int bus_set_address_system_remote(sd_bus *b, const char *host);
404 int bus_set_address_system_machine(sd_bus *b, const char *machine);
406 #if 0 /// UNNEEDED by elogind
408 int bus_get_root_path(sd_bus *bus);
410 int bus_maybe_reply_error(sd_bus_message *m, int r, sd_bus_error *error);
412 #define bus_assert_return(expr, r, error) \
414 if (!assert_log(expr, #expr)) \
415 return sd_bus_error_set_errno(error, r); \
418 void bus_enter_closing(sd_bus *bus);
420 void bus_set_state(sd_bus *bus, enum bus_state state);