1 /* SPDX-License-Identifier: LGPL-2.1+ */
5 #include <sys/socket.h>
10 #include "bus-kernel.h"
11 #include "bus-match.h"
16 #include "socket-util.h"
17 #include "time-util.h"
19 /* Note that we use the new /run prefix here (instead of /var/run) since we require them to be aliases and
20 * that way we become independent of /var being mounted */
21 #define DEFAULT_SYSTEM_BUS_ADDRESS "unix:path=/run/dbus/system_bus_socket"
22 #define DEFAULT_USER_BUS_ADDRESS_FMT "unix:path=%s/bus"
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 unsigned last_iteration
;
70 sd_bus_message_handler_t callback
;
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
);
95 unsigned last_iteration
;
98 const sd_bus_vtable
*vtable
;
99 sd_bus_object_find_t find
;
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 /* Slots can be "floating" or not. If they are not floating (the usual case) then they reference the bus object
129 * they are associated with. This means the bus object stays allocated at least as long as there is a slot
130 * around associated with it. If it is floating, then the slot's lifecycle is bound to the lifecycle of the
131 * bus: it will be disconnected from the bus when the bus is destroyed, and it keeping the slot reffed hence
132 * won't mean the bus stays reffed too. Internally this means the reference direction is reversed: floating
133 * slots objects are referenced by the bus object, and not vice versa. */
140 sd_bus_destroy_t destroy_callback
;
144 LIST_FIELDS(sd_bus_slot
, slots
);
147 struct reply_callback reply_callback
;
148 struct filter_callback filter_callback
;
149 struct match_callback match_callback
;
150 struct node_callback node_callback
;
151 struct node_enumerator node_enumerator
;
152 struct node_object_manager node_object_manager
;
153 struct node_vtable node_vtable
;
159 BUS_WATCH_BIND
, /* waiting for the socket to appear via inotify */
160 BUS_OPENING
, /* the kernel's connect() is still not ready */
161 BUS_AUTHENTICATING
, /* we are currently in the "SASL" authorization phase of dbus */
162 BUS_HELLO
, /* we are waiting for the Hello() response */
169 static inline bool BUS_IS_OPEN(enum bus_state state
) {
170 return state
> BUS_UNSET
&& state
< BUS_CLOSING
;
182 enum bus_state state
;
183 int input_fd
, output_fd
;
192 bool anonymous_auth
:1;
194 bool prefer_writev
:1;
195 bool match_callbacks_modified
:1;
196 bool filter_callbacks_modified
:1;
197 bool nodes_modified
:1;
199 bool manual_peer_interface
:1;
202 bool allow_interactive_authorization
:1;
203 bool exit_on_disconnect
:1;
205 bool exit_triggered
:1;
210 bool attach_timestamp
:1;
211 bool connected_signal
:1;
212 bool close_on_exit
:1;
214 signed int use_memfd
:2;
219 sd_bus_message
**rqueue
;
221 size_t rqueue_allocated
;
223 sd_bus_message
**wqueue
;
226 size_t wqueue_allocated
;
233 struct bus_match_node match_callbacks
;
234 Prioq
*reply_callbacks_prioq
;
235 OrderedHashmap
*reply_callbacks
;
236 LIST_HEAD(struct filter_callback
, filter_callbacks
);
239 Hashmap
*vtable_methods
;
240 Hashmap
*vtable_properties
;
242 union sockaddr_union sockaddr
;
243 socklen_t sockaddr_size
;
248 sd_id128_t server_id
;
251 unsigned address_index
;
253 int last_connect_error
;
257 struct iovec auth_iovec
[3];
275 /* We do locking around the memfd cache, since we want to
276 * allow people to process a sd_bus_message in a different
277 * thread then it was generated on and free it there. Since
278 * adding something to the memfd cache might happen when a
279 * message is released, we hence need to protect this bit with
281 pthread_mutex_t memfd_cache_mutex
;
282 struct memfd_cache memfd_cache
[MEMFD_CACHE_MAX
];
283 unsigned n_memfd_cache
;
288 unsigned iteration_counter
;
290 sd_event_source
*input_io_event_source
;
291 sd_event_source
*output_io_event_source
;
292 sd_event_source
*time_event_source
;
293 sd_event_source
*quit_event_source
;
294 sd_event_source
*inotify_event_source
;
300 sd_bus_message
*current_message
;
301 sd_bus_slot
*current_slot
;
302 sd_bus_message_handler_t current_handler
;
303 void *current_userdata
;
305 sd_bus
**default_bus_ptr
;
310 sd_bus_track
*track_queue
;
312 LIST_HEAD(sd_bus_slot
, slots
);
313 LIST_HEAD(sd_bus_track
, tracks
);
315 int *inotify_watches
;
316 size_t n_inotify_watches
;
318 /* zero means use value specified by $SYSTEMD_BUS_TIMEOUT= environment variable or built-in default */
319 usec_t method_call_timeout
;
322 /* For method calls we timeout at 25s, like in the D-Bus reference implementation */
323 #define BUS_DEFAULT_TIMEOUT ((usec_t) (25 * USEC_PER_SEC))
325 /* For the authentication phase we grant 90s, to provide extra room during boot, when RNGs and such are not filled up
326 * with enough entropy yet and might delay the boot */
327 #define BUS_AUTH_TIMEOUT ((usec_t) DEFAULT_TIMEOUT_USEC)
329 #define BUS_WQUEUE_MAX (192*1024)
330 #define BUS_RQUEUE_MAX (192*1024)
332 #define BUS_MESSAGE_SIZE_MAX (128*1024*1024)
333 #define BUS_AUTH_SIZE_MAX (64*1024)
334 /* Note that the D-Bus specification states that bus paths shall have no size limit. We enforce here one
335 * anyway, since truly unbounded strings are a security problem. The limit we pick is relatively large however,
336 * to not clash unnecessarily with real-life applications. */
337 #define BUS_PATH_SIZE_MAX (64*1024)
339 #define BUS_CONTAINER_DEPTH 128
341 /* Defined by the specification as maximum size of an array in bytes */
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 bool member_name_is_valid(const char *p
) _pure_
;
351 bool object_path_is_valid(const char *p
) _pure_
;
352 char *object_path_startswith(const char *a
, const char *b
) _pure_
;
354 bool namespace_complex_pattern(const char *pattern
, const char *value
) _pure_
;
355 bool path_complex_pattern(const char *pattern
, const char *value
) _pure_
;
357 bool namespace_simple_pattern(const char *pattern
, const char *value
) _pure_
;
358 bool path_simple_pattern(const char *pattern
, const char *value
) _pure_
;
360 int bus_message_type_from_string(const char *s
, uint8_t *u
) _pure_
;
361 const char *bus_message_type_to_string(uint8_t u
) _pure_
;
363 #define error_name_is_valid interface_name_is_valid
365 sd_bus
*bus_resolve(sd_bus
*bus
);
367 int bus_ensure_running(sd_bus
*bus
);
368 int bus_start_running(sd_bus
*bus
);
369 int bus_next_address(sd_bus
*bus
);
371 int bus_seal_synthetic_message(sd_bus
*b
, sd_bus_message
*m
);
373 int bus_rqueue_make_room(sd_bus
*bus
);
375 bool bus_pid_changed(sd_bus
*bus
);
377 char *bus_address_escape(const char *v
);
379 int bus_attach_io_events(sd_bus
*b
);
380 int bus_attach_inotify_event(sd_bus
*b
);
382 void bus_close_inotify_fd(sd_bus
*b
);
383 void bus_close_io_fds(sd_bus
*b
);
385 #define OBJECT_PATH_FOREACH_PREFIX(prefix, path) \
386 for (char *_slash = ({ strcpy((prefix), (path)); streq((prefix), "/") ? NULL : strrchr((prefix), '/'); }) ; \
387 _slash && ((_slash[(_slash) == (prefix)] = 0), true); \
388 _slash = streq((prefix), "/") ? NULL : strrchr((prefix), '/'))
390 /* If we are invoking callbacks of a bus object, ensure unreffing the
391 * bus from the callback doesn't destroy the object we are working on */
392 #define BUS_DONT_DESTROY(bus) \
393 _cleanup_(sd_bus_unrefp) _unused_ sd_bus *_dont_destroy_##bus = sd_bus_ref(bus)
395 int bus_set_address_system(sd_bus
*bus
);
396 int bus_set_address_user(sd_bus
*bus
);
397 int bus_set_address_system_remote(sd_bus
*b
, const char *host
);
398 int bus_set_address_system_machine(sd_bus
*b
, const char *machine
);
400 int bus_maybe_reply_error(sd_bus_message
*m
, int r
, sd_bus_error
*error
);
402 #define bus_assert_return(expr, r, error) \
404 if (!assert_log(expr, #expr)) \
405 return sd_bus_error_set_errno(error, r); \
408 void bus_enter_closing(sd_bus
*bus
);
410 void bus_set_state(sd_bus
*bus
, enum bus_state state
);