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de1c301e LP |
1 | #pragma once |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
45fbe937 | 22 | #include <pthread.h> |
07630cea | 23 | #include <sys/socket.h> |
de1c301e LP |
24 | |
25 | #include "sd-bus.h" | |
07630cea | 26 | |
de1c301e | 27 | #include "bus-error.h" |
bc7fd8cd | 28 | #include "bus-kernel.h" |
07630cea | 29 | #include "bus-match.h" |
036d61b3 | 30 | #include "def.h" |
07630cea | 31 | #include "hashmap.h" |
07630cea LP |
32 | #include "list.h" |
33 | #include "prioq.h" | |
34 | #include "refcnt.h" | |
35 | #include "socket-util.h" | |
36 | #include "util.h" | |
de1c301e LP |
37 | |
38 | struct reply_callback { | |
52f3ba91 | 39 | sd_bus_message_handler_t callback; |
de1c301e | 40 | usec_t timeout; |
693eb9a2 | 41 | uint64_t cookie; |
e3017af9 | 42 | unsigned prioq_idx; |
de1c301e LP |
43 | }; |
44 | ||
45 | struct filter_callback { | |
52f3ba91 | 46 | sd_bus_message_handler_t callback; |
de1c301e | 47 | |
7286037f LP |
48 | unsigned last_iteration; |
49 | ||
de1c301e LP |
50 | LIST_FIELDS(struct filter_callback, callbacks); |
51 | }; | |
52 | ||
19befb2d LP |
53 | struct match_callback { |
54 | sd_bus_message_handler_t callback; | |
55 | ||
19befb2d LP |
56 | unsigned last_iteration; |
57 | ||
58 | char *match_string; | |
59 | ||
60 | struct bus_match_node *match_node; | |
61 | }; | |
62 | ||
29ddb38f LP |
63 | struct node { |
64 | char *path; | |
65 | struct node *parent; | |
66 | LIST_HEAD(struct node, child); | |
67 | LIST_FIELDS(struct node, siblings); | |
68 | ||
69 | LIST_HEAD(struct node_callback, callbacks); | |
70 | LIST_HEAD(struct node_vtable, vtables); | |
71 | LIST_HEAD(struct node_enumerator, enumerators); | |
19befb2d | 72 | LIST_HEAD(struct node_object_manager, object_managers); |
29ddb38f LP |
73 | }; |
74 | ||
75 | struct node_callback { | |
76 | struct node *node; | |
77 | ||
78 | bool is_fallback; | |
52f3ba91 | 79 | sd_bus_message_handler_t callback; |
a652755d | 80 | |
29ddb38f LP |
81 | unsigned last_iteration; |
82 | ||
83 | LIST_FIELDS(struct node_callback, callbacks); | |
84 | }; | |
85 | ||
86 | struct node_enumerator { | |
87 | struct node *node; | |
88 | ||
89 | sd_bus_node_enumerator_t callback; | |
29ddb38f LP |
90 | |
91 | unsigned last_iteration; | |
92 | ||
93 | LIST_FIELDS(struct node_enumerator, enumerators); | |
94 | }; | |
95 | ||
19befb2d LP |
96 | struct node_object_manager { |
97 | struct node *node; | |
98 | ||
99 | LIST_FIELDS(struct node_object_manager, object_managers); | |
100 | }; | |
101 | ||
29ddb38f LP |
102 | struct node_vtable { |
103 | struct node *node; | |
104 | ||
105 | char *interface; | |
a652755d | 106 | bool is_fallback; |
29ddb38f | 107 | const sd_bus_vtable *vtable; |
29ddb38f | 108 | sd_bus_object_find_t find; |
7286037f LP |
109 | |
110 | unsigned last_iteration; | |
29ddb38f LP |
111 | |
112 | LIST_FIELDS(struct node_vtable, vtables); | |
113 | }; | |
114 | ||
115 | struct vtable_member { | |
116 | const char *path; | |
117 | const char *interface; | |
118 | const char *member; | |
119 | struct node_vtable *parent; | |
120 | unsigned last_iteration; | |
121 | const sd_bus_vtable *vtable; | |
a652755d LP |
122 | }; |
123 | ||
19befb2d | 124 | typedef enum BusSlotType { |
19befb2d LP |
125 | BUS_REPLY_CALLBACK, |
126 | BUS_FILTER_CALLBACK, | |
127 | BUS_MATCH_CALLBACK, | |
128 | BUS_NODE_CALLBACK, | |
129 | BUS_NODE_ENUMERATOR, | |
130 | BUS_NODE_VTABLE, | |
131 | BUS_NODE_OBJECT_MANAGER, | |
a71fe8b8 | 132 | _BUS_SLOT_INVALID = -1, |
19befb2d LP |
133 | } BusSlotType; |
134 | ||
135 | struct sd_bus_slot { | |
136 | unsigned n_ref; | |
137 | sd_bus *bus; | |
138 | void *userdata; | |
a71fe8b8 LP |
139 | BusSlotType type:5; |
140 | bool floating:1; | |
cc65fe5e | 141 | bool match_added:1; |
9cbfc66c | 142 | char *description; |
19befb2d LP |
143 | |
144 | LIST_FIELDS(sd_bus_slot, slots); | |
145 | ||
146 | union { | |
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; | |
154 | }; | |
155 | }; | |
156 | ||
de1c301e | 157 | enum bus_state { |
021a1e78 | 158 | BUS_UNSET, |
de1c301e LP |
159 | BUS_OPENING, |
160 | BUS_AUTHENTICATING, | |
161 | BUS_HELLO, | |
f54514f3 | 162 | BUS_RUNNING, |
718db961 | 163 | BUS_CLOSING, |
f54514f3 | 164 | BUS_CLOSED |
de1c301e LP |
165 | }; |
166 | ||
f54514f3 | 167 | static inline bool BUS_IS_OPEN(enum bus_state state) { |
718db961 | 168 | return state > BUS_UNSET && state < BUS_CLOSING; |
f54514f3 LP |
169 | } |
170 | ||
2181a7f5 LP |
171 | enum bus_auth { |
172 | _BUS_AUTH_INVALID, | |
173 | BUS_AUTH_EXTERNAL, | |
174 | BUS_AUTH_ANONYMOUS | |
175 | }; | |
176 | ||
de1c301e | 177 | struct sd_bus { |
e4ee6e5c LP |
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 | |
185 | same time. */ | |
186 | RefCount n_ref; | |
187 | ||
de1c301e | 188 | enum bus_state state; |
e82c9509 | 189 | int input_fd, output_fd; |
de1c301e | 190 | int message_version; |
0f437184 | 191 | int message_endian; |
021a1e78 | 192 | |
de1c301e | 193 | bool can_fds:1; |
94bbf1ba | 194 | bool bus_client:1; |
2571ead1 | 195 | bool ucred_valid:1; |
2181a7f5 LP |
196 | bool is_server:1; |
197 | bool anonymous_auth:1; | |
15d5af81 LP |
198 | bool prefer_readv:1; |
199 | bool prefer_writev:1; | |
7286037f LP |
200 | bool match_callbacks_modified:1; |
201 | bool filter_callbacks_modified:1; | |
29ddb38f | 202 | bool nodes_modified:1; |
adacb957 | 203 | bool trusted:1; |
758bf0c7 | 204 | bool manual_peer_interface:1; |
5972fe95 LP |
205 | bool is_system:1; |
206 | bool is_user:1; | |
c0765ddb | 207 | bool allow_interactive_authorization:1; |
fbb4603d LP |
208 | bool exit_on_disconnect:1; |
209 | bool exited:1; | |
210 | bool exit_triggered:1; | |
694859b5 | 211 | bool is_local:1; |
de1c301e | 212 | |
8f155917 LP |
213 | int use_memfd; |
214 | ||
de1c301e LP |
215 | void *rbuffer; |
216 | size_t rbuffer_size; | |
217 | ||
218 | sd_bus_message **rqueue; | |
821e0756 LP |
219 | unsigned rqueue_size; |
220 | size_t rqueue_allocated; | |
de1c301e LP |
221 | |
222 | sd_bus_message **wqueue; | |
223 | unsigned wqueue_size; | |
224 | size_t windex; | |
821e0756 | 225 | size_t wqueue_allocated; |
de1c301e | 226 | |
693eb9a2 | 227 | uint64_t cookie; |
de1c301e LP |
228 | |
229 | char *unique_name; | |
219728b3 | 230 | uint64_t unique_id; |
de1c301e | 231 | |
392d5b37 | 232 | struct bus_match_node match_callbacks; |
e3017af9 | 233 | Prioq *reply_callbacks_prioq; |
c9fe4af7 | 234 | OrderedHashmap *reply_callbacks; |
de1c301e | 235 | LIST_HEAD(struct filter_callback, filter_callbacks); |
29ddb38f LP |
236 | |
237 | Hashmap *nodes; | |
29ddb38f LP |
238 | Hashmap *vtable_methods; |
239 | Hashmap *vtable_properties; | |
de1c301e | 240 | |
3cb46740 | 241 | union sockaddr_union sockaddr; |
de1c301e LP |
242 | socklen_t sockaddr_size; |
243 | ||
a7893c6b | 244 | char *machine; |
ee502e0c | 245 | pid_t nspid; |
6629161f | 246 | |
98178d39 | 247 | sd_id128_t server_id; |
de1c301e LP |
248 | |
249 | char *address; | |
250 | unsigned address_index; | |
251 | ||
252 | int last_connect_error; | |
253 | ||
2181a7f5 LP |
254 | enum bus_auth auth; |
255 | size_t auth_rbegin; | |
de1c301e LP |
256 | struct iovec auth_iovec[3]; |
257 | unsigned auth_index; | |
2181a7f5 | 258 | char *auth_buffer; |
e3017af9 | 259 | usec_t auth_timeout; |
2571ead1 LP |
260 | |
261 | struct ucred ucred; | |
c4e6556c | 262 | char *label; |
2c93b4ef | 263 | |
5b12334d LP |
264 | uint64_t creds_mask; |
265 | ||
2c93b4ef LP |
266 | int *fds; |
267 | unsigned n_fds; | |
2fd9ae2e LP |
268 | |
269 | char *exec_path; | |
270 | char **exec_argv; | |
9d373862 | 271 | |
7286037f | 272 | unsigned iteration_counter; |
fd8d62d9 | 273 | |
45fbe937 LP |
274 | /* We do locking around the memfd cache, since we want to |
275 | * allow people to process a sd_bus_message in a different | |
276 | * thread then it was generated on and free it there. Since | |
277 | * adding something to the memfd cache might happen when a | |
278 | * message is released, we hence need to protect this bit with | |
279 | * a mutex. */ | |
280 | pthread_mutex_t memfd_cache_mutex; | |
bc7fd8cd LP |
281 | struct memfd_cache memfd_cache[MEMFD_CACHE_MAX]; |
282 | unsigned n_memfd_cache; | |
d5a2b9a6 LP |
283 | |
284 | pid_t original_pid; | |
264ad849 LP |
285 | |
286 | uint64_t hello_flags; | |
d21a7bb1 | 287 | uint64_t attach_flags; |
c7819669 | 288 | |
40ca29a1 LP |
289 | sd_event_source *input_io_event_source; |
290 | sd_event_source *output_io_event_source; | |
291 | sd_event_source *time_event_source; | |
abc5fe72 | 292 | sd_event_source *quit_event_source; |
40ca29a1 | 293 | sd_event *event; |
1e05d493 | 294 | int event_priority; |
affff0b6 | 295 | |
19befb2d LP |
296 | sd_bus_message *current_message; |
297 | sd_bus_slot *current_slot; | |
caa82984 LP |
298 | sd_bus_message_handler_t current_handler; |
299 | void *current_userdata; | |
76b54375 LP |
300 | |
301 | sd_bus **default_bus_ptr; | |
302 | pid_t tid; | |
8a0e0ed9 | 303 | |
751bc6ac | 304 | char *cgroup_root; |
5972fe95 | 305 | |
455971c1 | 306 | char *description; |
b28ff39f | 307 | |
8f8f05a9 | 308 | sd_bus_track *track_queue; |
19befb2d LP |
309 | |
310 | LIST_HEAD(sd_bus_slot, slots); | |
232f3677 | 311 | LIST_HEAD(sd_bus_track, tracks); |
40ca29a1 | 312 | }; |
e3017af9 | 313 | |
036d61b3 | 314 | /* For method calls we time-out at 25s, like in the D-Bus reference implementation */ |
e3017af9 | 315 | #define BUS_DEFAULT_TIMEOUT ((usec_t) (25 * USEC_PER_SEC)) |
25220239 | 316 | |
036d61b3 LP |
317 | /* For the authentication phase we grant 90s, to provide extra room during boot, when RNGs and such are not filled up |
318 | * with enough entropy yet and might delay the boot */ | |
319 | #define BUS_AUTH_TIMEOUT ((usec_t) DEFAULT_TIMEOUT_USEC) | |
320 | ||
5ddda46f LP |
321 | #define BUS_WQUEUE_MAX (192*1024) |
322 | #define BUS_RQUEUE_MAX (192*1024) | |
25220239 LP |
323 | |
324 | #define BUS_MESSAGE_SIZE_MAX (64*1024*1024) | |
325 | #define BUS_AUTH_SIZE_MAX (64*1024) | |
ac89bf1d | 326 | |
ed205a6b LP |
327 | #define BUS_CONTAINER_DEPTH 128 |
328 | ||
ac89bf1d LP |
329 | /* Defined by the specification as maximum size of an array in |
330 | * bytes */ | |
331 | #define BUS_ARRAY_MAX_SIZE 67108864 | |
332 | ||
2c93b4ef LP |
333 | #define BUS_FDS_MAX 1024 |
334 | ||
2fd9ae2e LP |
335 | #define BUS_EXEC_ARGV_MAX 256 |
336 | ||
0ce036ce LP |
337 | bool interface_name_is_valid(const char *p) _pure_; |
338 | bool service_name_is_valid(const char *p) _pure_; | |
f5d8989c | 339 | char* service_name_startswith(const char *a, const char *b); |
0ce036ce LP |
340 | bool member_name_is_valid(const char *p) _pure_; |
341 | bool object_path_is_valid(const char *p) _pure_; | |
342 | char *object_path_startswith(const char *a, const char *b) _pure_; | |
6693860f | 343 | |
0ce036ce LP |
344 | bool namespace_complex_pattern(const char *pattern, const char *value) _pure_; |
345 | bool path_complex_pattern(const char *pattern, const char *value) _pure_; | |
392d5b37 | 346 | |
0ce036ce LP |
347 | bool namespace_simple_pattern(const char *pattern, const char *value) _pure_; |
348 | bool path_simple_pattern(const char *pattern, const char *value) _pure_; | |
392d5b37 | 349 | |
0ce036ce LP |
350 | int bus_message_type_from_string(const char *s, uint8_t *u) _pure_; |
351 | const char *bus_message_type_to_string(uint8_t u) _pure_; | |
392d5b37 | 352 | |
6693860f | 353 | #define error_name_is_valid interface_name_is_valid |
20902f3e LP |
354 | |
355 | int bus_ensure_running(sd_bus *bus); | |
a7e3212d LP |
356 | int bus_start_running(sd_bus *bus); |
357 | int bus_next_address(sd_bus *bus); | |
d5a2b9a6 | 358 | |
7adc46fc | 359 | int bus_seal_synthetic_message(sd_bus *b, sd_bus_message *m); |
777d7a61 | 360 | |
7adc46fc | 361 | int bus_rqueue_make_room(sd_bus *bus); |
7d22c717 | 362 | |
d5a2b9a6 | 363 | bool bus_pid_changed(sd_bus *bus); |
92e189e5 | 364 | |
0f8bd8de LP |
365 | char *bus_address_escape(const char *v); |
366 | ||
92e189e5 LP |
367 | #define OBJECT_PATH_FOREACH_PREFIX(prefix, path) \ |
368 | for (char *_slash = ({ strcpy((prefix), (path)); streq((prefix), "/") ? NULL : strrchr((prefix), '/'); }) ; \ | |
369 | _slash && !(_slash[(_slash) == (prefix)] = 0); \ | |
370 | _slash = streq((prefix), "/") ? NULL : strrchr((prefix), '/')) | |
8ce2afd6 LP |
371 | |
372 | /* If we are invoking callbacks of a bus object, ensure unreffing the | |
373 | * bus from the callback doesn't destroy the object we are working | |
374 | * on */ | |
375 | #define BUS_DONT_DESTROY(bus) \ | |
4afd3348 | 376 | _cleanup_(sd_bus_unrefp) _unused_ sd_bus *_dont_destroy_##bus = sd_bus_ref(bus) |
09365592 LP |
377 | |
378 | int bus_set_address_system(sd_bus *bus); | |
379 | int bus_set_address_user(sd_bus *bus); | |
380 | int bus_set_address_system_remote(sd_bus *b, const char *host); | |
de33fc62 | 381 | int bus_set_address_system_machine(sd_bus *b, const char *machine); |
19befb2d LP |
382 | |
383 | int bus_remove_match_by_string(sd_bus *bus, const char *match, sd_bus_message_handler_t callback, void *userdata); | |
fe3f22d1 DK |
384 | |
385 | int bus_get_root_path(sd_bus *bus); | |
a095315b KS |
386 | |
387 | int bus_maybe_reply_error(sd_bus_message *m, int r, sd_bus_error *error); | |
d4d00020 | 388 | |
759e02e7 LP |
389 | #define bus_assert_return(expr, r, error) \ |
390 | do { \ | |
34c38d2a | 391 | if (!assert_log(expr, #expr)) \ |
759e02e7 LP |
392 | return sd_bus_error_set_errno(error, r); \ |
393 | } while (false) | |
a132bef0 ZJS |
394 | |
395 | /** | |
396 | * enum kdbus_attach_flags - flags for metadata attachments | |
397 | * @KDBUS_ATTACH_TIMESTAMP: Timestamp | |
398 | * @KDBUS_ATTACH_CREDS: Credentials | |
399 | * @KDBUS_ATTACH_PIDS: PIDs | |
400 | * @KDBUS_ATTACH_AUXGROUPS: Auxiliary groups | |
401 | * @KDBUS_ATTACH_NAMES: Well-known names | |
402 | * @KDBUS_ATTACH_TID_COMM: The "comm" process identifier of the TID | |
403 | * @KDBUS_ATTACH_PID_COMM: The "comm" process identifier of the PID | |
404 | * @KDBUS_ATTACH_EXE: The path of the executable | |
405 | * @KDBUS_ATTACH_CMDLINE: The process command line | |
406 | * @KDBUS_ATTACH_CGROUP: The croup membership | |
407 | * @KDBUS_ATTACH_CAPS: The process capabilities | |
408 | * @KDBUS_ATTACH_SECLABEL: The security label | |
409 | * @KDBUS_ATTACH_AUDIT: The audit IDs | |
410 | * @KDBUS_ATTACH_CONN_DESCRIPTION: The human-readable connection name | |
411 | * @_KDBUS_ATTACH_ALL: All of the above | |
412 | * @_KDBUS_ATTACH_ANY: Wildcard match to enable any kind of | |
413 | * metatdata. | |
414 | */ | |
415 | enum kdbus_attach_flags { | |
416 | KDBUS_ATTACH_TIMESTAMP = 1ULL << 0, | |
417 | KDBUS_ATTACH_CREDS = 1ULL << 1, | |
418 | KDBUS_ATTACH_PIDS = 1ULL << 2, | |
419 | KDBUS_ATTACH_AUXGROUPS = 1ULL << 3, | |
420 | KDBUS_ATTACH_NAMES = 1ULL << 4, | |
421 | KDBUS_ATTACH_TID_COMM = 1ULL << 5, | |
422 | KDBUS_ATTACH_PID_COMM = 1ULL << 6, | |
423 | KDBUS_ATTACH_EXE = 1ULL << 7, | |
424 | KDBUS_ATTACH_CMDLINE = 1ULL << 8, | |
425 | KDBUS_ATTACH_CGROUP = 1ULL << 9, | |
426 | KDBUS_ATTACH_CAPS = 1ULL << 10, | |
427 | KDBUS_ATTACH_SECLABEL = 1ULL << 11, | |
428 | KDBUS_ATTACH_AUDIT = 1ULL << 12, | |
429 | KDBUS_ATTACH_CONN_DESCRIPTION = 1ULL << 13, | |
430 | _KDBUS_ATTACH_ALL = (1ULL << 14) - 1, | |
431 | _KDBUS_ATTACH_ANY = ~0ULL | |
432 | }; | |
433 | ||
434 | /** | |
435 | * enum kdbus_hello_flags - flags for struct kdbus_cmd_hello | |
436 | * @KDBUS_HELLO_ACCEPT_FD: The connection allows the reception of | |
437 | * any passed file descriptors | |
438 | * @KDBUS_HELLO_ACTIVATOR: Special-purpose connection which registers | |
439 | * a well-know name for a process to be started | |
440 | * when traffic arrives | |
441 | * @KDBUS_HELLO_POLICY_HOLDER: Special-purpose connection which registers | |
442 | * policy entries for a name. The provided name | |
443 | * is not activated and not registered with the | |
444 | * name database, it only allows unprivileged | |
445 | * connections to acquire a name, talk or discover | |
446 | * a service | |
447 | * @KDBUS_HELLO_MONITOR: Special-purpose connection to monitor | |
448 | * bus traffic | |
449 | */ | |
450 | enum kdbus_hello_flags { | |
451 | KDBUS_HELLO_ACCEPT_FD = 1ULL << 0, | |
452 | KDBUS_HELLO_ACTIVATOR = 1ULL << 1, | |
453 | KDBUS_HELLO_POLICY_HOLDER = 1ULL << 2, | |
454 | KDBUS_HELLO_MONITOR = 1ULL << 3, | |
455 | }; |