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392d5b37 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
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 | ||
22 | #include "bus-internal.h" | |
23 | #include "bus-message.h" | |
24 | #include "bus-match.h" | |
ebcf1f97 LP |
25 | #include "bus-error.h" |
26 | #include "bus-util.h" | |
06100c7a | 27 | #include "strv.h" |
392d5b37 LP |
28 | |
29 | /* Example: | |
30 | * | |
31 | * A: type=signal,sender=foo,interface=bar | |
32 | * B: type=signal,sender=quux,interface=fips | |
33 | * C: type=signal,sender=quux,interface=waldo | |
34 | * D: type=signal,member=test | |
35 | * E: sender=miau | |
36 | * F: type=signal | |
37 | * G: type=signal | |
38 | * | |
39 | * results in this tree: | |
40 | * | |
41 | * BUS_MATCH_ROOT | |
42 | * + BUS_MATCH_MESSAGE_TYPE | |
43 | * | ` BUS_MATCH_VALUE: value == signal | |
44 | * | + DBUS_MATCH_SENDER | |
45 | * | | + BUS_MATCH_VALUE: value == foo | |
46 | * | | | ` DBUS_MATCH_INTERFACE | |
47 | * | | | ` BUS_MATCH_VALUE: value == bar | |
48 | * | | | ` BUS_MATCH_LEAF: A | |
49 | * | | ` BUS_MATCH_VALUE: value == quux | |
50 | * | | ` DBUS_MATCH_INTERFACE | |
51 | * | | | BUS_MATCH_VALUE: value == fips | |
52 | * | | | ` BUS_MATCH_LEAF: B | |
53 | * | | ` BUS_MATCH_VALUE: value == waldo | |
54 | * | | ` BUS_MATCH_LEAF: C | |
55 | * | + DBUS_MATCH_MEMBER | |
56 | * | | ` BUS_MATCH_VALUE: value == test | |
57 | * | | ` BUS_MATCH_LEAF: D | |
58 | * | + BUS_MATCH_LEAF: F | |
59 | * | ` BUS_MATCH_LEAF: G | |
60 | * ` BUS_MATCH_SENDER | |
61 | * ` BUS_MATCH_VALUE: value == miau | |
62 | * ` BUS_MATCH_LEAF: E | |
63 | */ | |
64 | ||
65 | static inline bool BUS_MATCH_IS_COMPARE(enum bus_match_node_type t) { | |
ae7bed3f | 66 | return t >= BUS_MATCH_SENDER && t <= BUS_MATCH_ARG_NAMESPACE_LAST; |
392d5b37 LP |
67 | } |
68 | ||
69 | static inline bool BUS_MATCH_CAN_HASH(enum bus_match_node_type t) { | |
70 | return (t >= BUS_MATCH_MESSAGE_TYPE && t <= BUS_MATCH_PATH) || | |
71 | (t >= BUS_MATCH_ARG && t <= BUS_MATCH_ARG_LAST); | |
72 | } | |
73 | ||
74 | static void bus_match_node_free(struct bus_match_node *node) { | |
75 | assert(node); | |
76 | assert(node->parent); | |
77 | assert(!node->child); | |
78 | assert(node->type != BUS_MATCH_ROOT); | |
79 | assert(node->type < _BUS_MATCH_NODE_TYPE_MAX); | |
80 | ||
81 | if (node->parent->child) { | |
82 | /* We are apparently linked into the parent's child | |
83 | * list. Let's remove us from there. */ | |
84 | if (node->prev) { | |
85 | assert(node->prev->next == node); | |
86 | node->prev->next = node->next; | |
87 | } else { | |
88 | assert(node->parent->child == node); | |
89 | node->parent->child = node->next; | |
90 | } | |
91 | ||
92 | if (node->next) | |
93 | node->next->prev = node->prev; | |
94 | } | |
95 | ||
96 | if (node->type == BUS_MATCH_VALUE) { | |
97 | /* We might be in the parent's hash table, so clean | |
98 | * this up */ | |
99 | ||
100 | if (node->parent->type == BUS_MATCH_MESSAGE_TYPE) | |
101 | hashmap_remove(node->parent->compare.children, UINT_TO_PTR(node->value.u8)); | |
102 | else if (BUS_MATCH_CAN_HASH(node->parent->type) && node->value.str) | |
103 | hashmap_remove(node->parent->compare.children, node->value.str); | |
104 | ||
105 | free(node->value.str); | |
106 | } | |
107 | ||
108 | if (BUS_MATCH_IS_COMPARE(node->type)) { | |
109 | assert(hashmap_isempty(node->compare.children)); | |
110 | hashmap_free(node->compare.children); | |
111 | } | |
112 | ||
113 | free(node); | |
114 | } | |
115 | ||
116 | static bool bus_match_node_maybe_free(struct bus_match_node *node) { | |
117 | assert(node); | |
118 | ||
19befb2d LP |
119 | if (node->type == BUS_MATCH_ROOT) |
120 | return false; | |
121 | ||
392d5b37 LP |
122 | if (node->child) |
123 | return false; | |
124 | ||
125 | if (BUS_MATCH_IS_COMPARE(node->type) && !hashmap_isempty(node->compare.children)) | |
126 | return true; | |
127 | ||
128 | bus_match_node_free(node); | |
129 | return true; | |
130 | } | |
131 | ||
132 | static bool value_node_test( | |
133 | struct bus_match_node *node, | |
134 | enum bus_match_node_type parent_type, | |
135 | uint8_t value_u8, | |
06100c7a LP |
136 | const char *value_str, |
137 | sd_bus_message *m) { | |
392d5b37 LP |
138 | |
139 | assert(node); | |
140 | assert(node->type == BUS_MATCH_VALUE); | |
141 | ||
142 | /* Tests parameters against this value node, doing prefix | |
143 | * magic and stuff. */ | |
144 | ||
145 | switch (parent_type) { | |
146 | ||
147 | case BUS_MATCH_MESSAGE_TYPE: | |
148 | return node->value.u8 == value_u8; | |
149 | ||
150 | case BUS_MATCH_SENDER: | |
ae7bed3f LP |
151 | if (streq_ptr(node->value.str, value_str)) |
152 | return true; | |
153 | ||
06100c7a LP |
154 | if (m->creds.mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) { |
155 | char **i; | |
ae7bed3f | 156 | |
06100c7a LP |
157 | /* on kdbus we have the well known names list |
158 | * in the credentials, let's make use of that | |
159 | * for an accurate match */ | |
160 | ||
161 | STRV_FOREACH(i, m->creds.well_known_names) | |
162 | if (streq_ptr(node->value.str, *i)) | |
163 | return true; | |
164 | ||
165 | } else { | |
166 | ||
167 | /* If we don't have kdbus, we don't know the | |
168 | * well-known names of the senders. In that, | |
169 | * let's just hope that dbus-daemon doesn't | |
170 | * send us stuff we didn't want. */ | |
171 | ||
172 | if (node->value.str[0] != ':' && value_str && value_str[0] == ':') | |
173 | return true; | |
174 | } | |
ae7bed3f LP |
175 | |
176 | return false; | |
177 | ||
06100c7a | 178 | case BUS_MATCH_DESTINATION: |
392d5b37 LP |
179 | case BUS_MATCH_INTERFACE: |
180 | case BUS_MATCH_MEMBER: | |
181 | case BUS_MATCH_PATH: | |
182 | case BUS_MATCH_ARG ... BUS_MATCH_ARG_LAST: | |
42c5aaf3 | 183 | return streq_ptr(node->value.str, value_str); |
392d5b37 LP |
184 | |
185 | case BUS_MATCH_ARG_NAMESPACE ... BUS_MATCH_ARG_NAMESPACE_LAST: | |
186 | return namespace_simple_pattern(node->value.str, value_str); | |
187 | ||
188 | case BUS_MATCH_PATH_NAMESPACE: | |
189 | return path_simple_pattern(node->value.str, value_str); | |
190 | ||
191 | case BUS_MATCH_ARG_PATH ... BUS_MATCH_ARG_PATH_LAST: | |
192 | return path_complex_pattern(node->value.str, value_str); | |
193 | ||
194 | default: | |
195 | assert_not_reached("Invalid node type"); | |
196 | } | |
197 | } | |
198 | ||
199 | static bool value_node_same( | |
200 | struct bus_match_node *node, | |
201 | enum bus_match_node_type parent_type, | |
202 | uint8_t value_u8, | |
203 | const char *value_str) { | |
204 | ||
205 | /* Tests parameters against this value node, not doing prefix | |
206 | * magic and stuff, i.e. this one actually compares the match | |
207 | * itself.*/ | |
208 | ||
209 | assert(node); | |
210 | assert(node->type == BUS_MATCH_VALUE); | |
211 | ||
212 | switch (parent_type) { | |
213 | ||
214 | case BUS_MATCH_MESSAGE_TYPE: | |
215 | return node->value.u8 == value_u8; | |
216 | ||
217 | case BUS_MATCH_SENDER: | |
218 | case BUS_MATCH_DESTINATION: | |
219 | case BUS_MATCH_INTERFACE: | |
220 | case BUS_MATCH_MEMBER: | |
221 | case BUS_MATCH_PATH: | |
222 | case BUS_MATCH_ARG ... BUS_MATCH_ARG_LAST: | |
223 | case BUS_MATCH_ARG_NAMESPACE ... BUS_MATCH_ARG_NAMESPACE_LAST: | |
224 | case BUS_MATCH_PATH_NAMESPACE: | |
225 | case BUS_MATCH_ARG_PATH ... BUS_MATCH_ARG_PATH_LAST: | |
226 | return streq(node->value.str, value_str); | |
227 | ||
228 | default: | |
229 | assert_not_reached("Invalid node type"); | |
230 | } | |
231 | } | |
232 | ||
233 | int bus_match_run( | |
234 | sd_bus *bus, | |
235 | struct bus_match_node *node, | |
392d5b37 LP |
236 | sd_bus_message *m) { |
237 | ||
238 | ||
239 | const char *test_str = NULL; | |
240 | uint8_t test_u8 = 0; | |
241 | int r; | |
242 | ||
243 | assert(m); | |
244 | ||
245 | if (!node) | |
246 | return 0; | |
247 | ||
7286037f LP |
248 | if (bus && bus->match_callbacks_modified) |
249 | return 0; | |
250 | ||
392d5b37 LP |
251 | /* Not these special semantics: when traversing the tree we |
252 | * usually let bus_match_run() when called for a node | |
253 | * recursively invoke bus_match_run(). There's are two | |
254 | * exceptions here though, which are BUS_NODE_ROOT (which | |
255 | * cannot have a sibling), and BUS_NODE_VALUE (whose siblings | |
256 | * are invoked anyway by its parent. */ | |
257 | ||
258 | switch (node->type) { | |
259 | ||
260 | case BUS_MATCH_ROOT: | |
261 | ||
262 | /* Run all children. Since we cannot have any siblings | |
263 | * we won't call any. The children of the root node | |
264 | * are compares or leaves, they will automatically | |
265 | * call their siblings. */ | |
eb01ba5d | 266 | return bus_match_run(bus, node->child, m); |
392d5b37 LP |
267 | |
268 | case BUS_MATCH_VALUE: | |
269 | ||
270 | /* Run all children. We don't execute any siblings, we | |
271 | * assume our caller does that. The children of value | |
272 | * nodes are compares or leaves, they will | |
273 | * automatically call their siblings */ | |
274 | ||
275 | assert(node->child); | |
eb01ba5d | 276 | return bus_match_run(bus, node->child, m); |
392d5b37 LP |
277 | |
278 | case BUS_MATCH_LEAF: | |
279 | ||
7286037f | 280 | if (bus) { |
19befb2d | 281 | if (node->leaf.callback->last_iteration == bus->iteration_counter) |
7286037f LP |
282 | return 0; |
283 | ||
19befb2d | 284 | node->leaf.callback->last_iteration = bus->iteration_counter; |
7286037f LP |
285 | } |
286 | ||
88fe224c LP |
287 | r = sd_bus_message_rewind(m, true); |
288 | if (r < 0) | |
289 | return r; | |
290 | ||
392d5b37 | 291 | /* Run the callback. And then invoke siblings. */ |
c7819669 | 292 | if (node->leaf.callback) { |
ebcf1f97 | 293 | _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL; |
1b64f838 | 294 | sd_bus_slot *slot; |
ebcf1f97 | 295 | |
19befb2d LP |
296 | slot = container_of(node->leaf.callback, sd_bus_slot, match_callback); |
297 | if (bus) | |
1b64f838 | 298 | bus->current_slot = sd_bus_slot_ref(slot); |
19befb2d LP |
299 | r = node->leaf.callback->callback(bus, m, slot->userdata, &error_buffer); |
300 | if (bus) | |
1b64f838 | 301 | bus->current_slot = sd_bus_slot_unref(slot); |
19befb2d | 302 | |
ebcf1f97 | 303 | r = bus_maybe_reply_error(m, r, &error_buffer); |
c7819669 LP |
304 | if (r != 0) |
305 | return r; | |
bbb6ff02 LP |
306 | |
307 | if (bus && bus->match_callbacks_modified) | |
308 | return 0; | |
c7819669 | 309 | } |
392d5b37 | 310 | |
eb01ba5d | 311 | return bus_match_run(bus, node->next, m); |
392d5b37 LP |
312 | |
313 | case BUS_MATCH_MESSAGE_TYPE: | |
314 | test_u8 = m->header->type; | |
315 | break; | |
316 | ||
317 | case BUS_MATCH_SENDER: | |
318 | test_str = m->sender; | |
319 | /* FIXME: resolve test_str from a well-known to a unique name first */ | |
320 | break; | |
321 | ||
322 | case BUS_MATCH_DESTINATION: | |
323 | test_str = m->destination; | |
324 | break; | |
325 | ||
326 | case BUS_MATCH_INTERFACE: | |
327 | test_str = m->interface; | |
328 | break; | |
329 | ||
330 | case BUS_MATCH_MEMBER: | |
331 | test_str = m->member; | |
332 | break; | |
333 | ||
334 | case BUS_MATCH_PATH: | |
335 | case BUS_MATCH_PATH_NAMESPACE: | |
336 | test_str = m->path; | |
337 | break; | |
338 | ||
339 | case BUS_MATCH_ARG ... BUS_MATCH_ARG_LAST: | |
340 | test_str = bus_message_get_arg(m, node->type - BUS_MATCH_ARG); | |
341 | break; | |
342 | ||
343 | case BUS_MATCH_ARG_PATH ... BUS_MATCH_ARG_PATH_LAST: | |
344 | test_str = bus_message_get_arg(m, node->type - BUS_MATCH_ARG_PATH); | |
345 | break; | |
346 | ||
347 | case BUS_MATCH_ARG_NAMESPACE ... BUS_MATCH_ARG_NAMESPACE_LAST: | |
348 | test_str = bus_message_get_arg(m, node->type - BUS_MATCH_ARG_NAMESPACE); | |
349 | break; | |
350 | ||
351 | default: | |
352 | assert_not_reached("Unknown match type."); | |
353 | } | |
354 | ||
355 | if (BUS_MATCH_CAN_HASH(node->type)) { | |
356 | struct bus_match_node *found; | |
357 | ||
358 | /* Lookup via hash table, nice! So let's jump directly. */ | |
359 | ||
360 | if (test_str) | |
361 | found = hashmap_get(node->compare.children, test_str); | |
362 | else if (node->type == BUS_MATCH_MESSAGE_TYPE) | |
363 | found = hashmap_get(node->compare.children, UINT_TO_PTR(test_u8)); | |
364 | else | |
365 | found = NULL; | |
366 | ||
367 | if (found) { | |
eb01ba5d | 368 | r = bus_match_run(bus, found, m); |
392d5b37 LP |
369 | if (r != 0) |
370 | return r; | |
371 | } | |
372 | } else { | |
373 | struct bus_match_node *c; | |
374 | ||
375 | /* No hash table, so let's iterate manually... */ | |
376 | ||
377 | for (c = node->child; c; c = c->next) { | |
06100c7a | 378 | if (!value_node_test(c, node->type, test_u8, test_str, m)) |
392d5b37 LP |
379 | continue; |
380 | ||
eb01ba5d | 381 | r = bus_match_run(bus, c, m); |
392d5b37 LP |
382 | if (r != 0) |
383 | return r; | |
384 | } | |
385 | } | |
386 | ||
7286037f LP |
387 | if (bus && bus->match_callbacks_modified) |
388 | return 0; | |
389 | ||
392d5b37 | 390 | /* And now, let's invoke our siblings */ |
eb01ba5d | 391 | return bus_match_run(bus, node->next, m); |
392d5b37 LP |
392 | } |
393 | ||
394 | static int bus_match_add_compare_value( | |
395 | struct bus_match_node *where, | |
396 | enum bus_match_node_type t, | |
397 | uint8_t value_u8, | |
398 | const char *value_str, | |
399 | struct bus_match_node **ret) { | |
400 | ||
401 | struct bus_match_node *c = NULL, *n = NULL; | |
402 | int r; | |
403 | ||
404 | assert(where); | |
405 | assert(where->type == BUS_MATCH_ROOT || where->type == BUS_MATCH_VALUE); | |
406 | assert(BUS_MATCH_IS_COMPARE(t)); | |
407 | assert(ret); | |
408 | ||
409 | for (c = where->child; c && c->type != t; c = c->next) | |
410 | ; | |
411 | ||
412 | if (c) { | |
413 | /* Comparison node already exists? Then let's see if | |
414 | * the value node exists too. */ | |
415 | ||
416 | if (t == BUS_MATCH_MESSAGE_TYPE) | |
417 | n = hashmap_get(c->compare.children, UINT_TO_PTR(value_u8)); | |
418 | else if (BUS_MATCH_CAN_HASH(t)) | |
419 | n = hashmap_get(c->compare.children, value_str); | |
420 | else { | |
421 | for (n = c->child; n && !value_node_same(n, t, value_u8, value_str); n = n->next) | |
422 | ; | |
423 | } | |
424 | ||
425 | if (n) { | |
426 | *ret = n; | |
427 | return 0; | |
428 | } | |
429 | } else { | |
430 | /* Comparison node, doesn't exist yet? Then let's | |
431 | * create it. */ | |
432 | ||
433 | c = new0(struct bus_match_node, 1); | |
434 | if (!c) { | |
435 | r = -ENOMEM; | |
436 | goto fail; | |
437 | } | |
438 | ||
439 | c->type = t; | |
440 | c->parent = where; | |
441 | c->next = where->child; | |
442 | if (c->next) | |
443 | c->next->prev = c; | |
444 | where->child = c; | |
445 | ||
446 | if (t == BUS_MATCH_MESSAGE_TYPE) { | |
447 | c->compare.children = hashmap_new(trivial_hash_func, trivial_compare_func); | |
448 | if (!c->compare.children) { | |
449 | r = -ENOMEM; | |
450 | goto fail; | |
451 | } | |
452 | } else if (BUS_MATCH_CAN_HASH(t)) { | |
453 | c->compare.children = hashmap_new(string_hash_func, string_compare_func); | |
454 | if (!c->compare.children) { | |
455 | r = -ENOMEM; | |
456 | goto fail; | |
457 | } | |
458 | } | |
459 | } | |
460 | ||
461 | n = new0(struct bus_match_node, 1); | |
462 | if (!n) { | |
463 | r = -ENOMEM; | |
464 | goto fail; | |
465 | } | |
466 | ||
467 | n->type = BUS_MATCH_VALUE; | |
468 | n->value.u8 = value_u8; | |
469 | if (value_str) { | |
470 | n->value.str = strdup(value_str); | |
471 | if (!n->value.str) { | |
472 | r = -ENOMEM; | |
473 | goto fail; | |
474 | } | |
475 | } | |
476 | ||
477 | n->parent = c; | |
478 | if (c->compare.children) { | |
479 | ||
480 | if (t == BUS_MATCH_MESSAGE_TYPE) | |
481 | r = hashmap_put(c->compare.children, UINT_TO_PTR(value_u8), n); | |
482 | else | |
483 | r = hashmap_put(c->compare.children, n->value.str, n); | |
484 | ||
485 | if (r < 0) | |
486 | goto fail; | |
487 | } else { | |
488 | n->next = c->child; | |
489 | if (n->next) | |
490 | n->next->prev = n; | |
491 | c->child = n; | |
492 | } | |
493 | ||
494 | *ret = n; | |
495 | return 1; | |
496 | ||
497 | fail: | |
498 | if (c) | |
499 | bus_match_node_maybe_free(c); | |
500 | ||
501 | if (n) { | |
502 | free(n->value.str); | |
503 | free(n); | |
504 | } | |
505 | ||
506 | return r; | |
507 | } | |
508 | ||
509 | static int bus_match_find_compare_value( | |
510 | struct bus_match_node *where, | |
511 | enum bus_match_node_type t, | |
512 | uint8_t value_u8, | |
513 | const char *value_str, | |
514 | struct bus_match_node **ret) { | |
515 | ||
516 | struct bus_match_node *c, *n; | |
517 | ||
518 | assert(where); | |
519 | assert(where->type == BUS_MATCH_ROOT || where->type == BUS_MATCH_VALUE); | |
520 | assert(BUS_MATCH_IS_COMPARE(t)); | |
521 | assert(ret); | |
522 | ||
523 | for (c = where->child; c && c->type != t; c = c->next) | |
524 | ; | |
525 | ||
526 | if (!c) | |
527 | return 0; | |
528 | ||
529 | if (t == BUS_MATCH_MESSAGE_TYPE) | |
530 | n = hashmap_get(c->compare.children, UINT_TO_PTR(value_u8)); | |
531 | else if (BUS_MATCH_CAN_HASH(t)) | |
532 | n = hashmap_get(c->compare.children, value_str); | |
533 | else { | |
534 | for (n = c->child; !value_node_same(n, t, value_u8, value_str); n = n->next) | |
535 | ; | |
536 | } | |
537 | ||
538 | if (n) { | |
539 | *ret = n; | |
540 | return 1; | |
541 | } | |
542 | ||
543 | return 0; | |
544 | } | |
545 | ||
546 | static int bus_match_add_leaf( | |
547 | struct bus_match_node *where, | |
19befb2d | 548 | struct match_callback *callback) { |
392d5b37 LP |
549 | |
550 | struct bus_match_node *n; | |
551 | ||
552 | assert(where); | |
553 | assert(where->type == BUS_MATCH_ROOT || where->type == BUS_MATCH_VALUE); | |
19befb2d | 554 | assert(callback); |
392d5b37 LP |
555 | |
556 | n = new0(struct bus_match_node, 1); | |
557 | if (!n) | |
558 | return -ENOMEM; | |
559 | ||
560 | n->type = BUS_MATCH_LEAF; | |
561 | n->parent = where; | |
562 | n->next = where->child; | |
563 | if (n->next) | |
564 | n->next->prev = n; | |
19befb2d | 565 | |
392d5b37 | 566 | n->leaf.callback = callback; |
19befb2d | 567 | callback->match_node = n; |
392d5b37 LP |
568 | |
569 | where->child = n; | |
570 | ||
392d5b37 LP |
571 | return 1; |
572 | } | |
573 | ||
574 | static int bus_match_find_leaf( | |
575 | struct bus_match_node *where, | |
52f3ba91 | 576 | sd_bus_message_handler_t callback, |
392d5b37 LP |
577 | void *userdata, |
578 | struct bus_match_node **ret) { | |
579 | ||
580 | struct bus_match_node *c; | |
581 | ||
582 | assert(where); | |
583 | assert(where->type == BUS_MATCH_ROOT || where->type == BUS_MATCH_VALUE); | |
584 | assert(ret); | |
585 | ||
586 | for (c = where->child; c; c = c->next) { | |
19befb2d LP |
587 | sd_bus_slot *s; |
588 | ||
589 | s = container_of(c->leaf.callback, sd_bus_slot, match_callback); | |
590 | ||
392d5b37 | 591 | if (c->type == BUS_MATCH_LEAF && |
19befb2d LP |
592 | c->leaf.callback->callback == callback && |
593 | s->userdata == userdata) { | |
392d5b37 LP |
594 | *ret = c; |
595 | return 1; | |
596 | } | |
597 | } | |
598 | ||
599 | return 0; | |
600 | } | |
601 | ||
602 | enum bus_match_node_type bus_match_node_type_from_string(const char *k, size_t n) { | |
603 | assert(k); | |
604 | ||
2a0e0692 | 605 | if (n == 4 && startswith(k, "type")) |
392d5b37 | 606 | return BUS_MATCH_MESSAGE_TYPE; |
2a0e0692 | 607 | if (n == 6 && startswith(k, "sender")) |
392d5b37 | 608 | return BUS_MATCH_SENDER; |
2a0e0692 | 609 | if (n == 11 && startswith(k, "destination")) |
392d5b37 | 610 | return BUS_MATCH_DESTINATION; |
2a0e0692 | 611 | if (n == 9 && startswith(k, "interface")) |
392d5b37 | 612 | return BUS_MATCH_INTERFACE; |
2a0e0692 | 613 | if (n == 6 && startswith(k, "member")) |
392d5b37 | 614 | return BUS_MATCH_MEMBER; |
2a0e0692 | 615 | if (n == 4 && startswith(k, "path")) |
392d5b37 | 616 | return BUS_MATCH_PATH; |
2a0e0692 | 617 | if (n == 14 && startswith(k, "path_namespace")) |
392d5b37 LP |
618 | return BUS_MATCH_PATH_NAMESPACE; |
619 | ||
2a0e0692 | 620 | if (n == 4 && startswith(k, "arg")) { |
392d5b37 LP |
621 | int j; |
622 | ||
623 | j = undecchar(k[3]); | |
624 | if (j < 0) | |
625 | return -EINVAL; | |
626 | ||
627 | return BUS_MATCH_ARG + j; | |
628 | } | |
629 | ||
2a0e0692 | 630 | if (n == 5 && startswith(k, "arg")) { |
392d5b37 LP |
631 | int a, b; |
632 | enum bus_match_node_type t; | |
633 | ||
634 | a = undecchar(k[3]); | |
635 | b = undecchar(k[4]); | |
636 | if (a <= 0 || b < 0) | |
637 | return -EINVAL; | |
638 | ||
639 | t = BUS_MATCH_ARG + a * 10 + b; | |
640 | if (t > BUS_MATCH_ARG_LAST) | |
641 | return -EINVAL; | |
642 | ||
643 | return t; | |
644 | } | |
645 | ||
2a0e0692 | 646 | if (n == 8 && startswith(k, "arg") && startswith(k + 4, "path")) { |
392d5b37 LP |
647 | int j; |
648 | ||
649 | j = undecchar(k[3]); | |
650 | if (j < 0) | |
651 | return -EINVAL; | |
652 | ||
653 | return BUS_MATCH_ARG_PATH + j; | |
654 | } | |
655 | ||
2a0e0692 | 656 | if (n == 9 && startswith(k, "arg") && startswith(k + 5, "path")) { |
392d5b37 LP |
657 | enum bus_match_node_type t; |
658 | int a, b; | |
659 | ||
660 | a = undecchar(k[3]); | |
661 | b = undecchar(k[4]); | |
662 | if (a <= 0 || b < 0) | |
663 | return -EINVAL; | |
664 | ||
665 | t = BUS_MATCH_ARG_PATH + a * 10 + b; | |
666 | if (t > BUS_MATCH_ARG_PATH_LAST) | |
667 | return -EINVAL; | |
668 | ||
669 | return t; | |
670 | } | |
671 | ||
2a0e0692 | 672 | if (n == 13 && startswith(k, "arg") && startswith(k + 4, "namespace")) { |
392d5b37 LP |
673 | int j; |
674 | ||
675 | j = undecchar(k[3]); | |
676 | if (j < 0) | |
677 | return -EINVAL; | |
678 | ||
679 | return BUS_MATCH_ARG_NAMESPACE + j; | |
680 | } | |
681 | ||
2a0e0692 | 682 | if (n == 14 && startswith(k, "arg") && startswith(k + 5, "namespace")) { |
392d5b37 LP |
683 | enum bus_match_node_type t; |
684 | int a, b; | |
685 | ||
686 | a = undecchar(k[3]); | |
687 | b = undecchar(k[4]); | |
688 | if (a <= 0 || b < 0) | |
689 | return -EINVAL; | |
690 | ||
691 | t = BUS_MATCH_ARG_NAMESPACE + a * 10 + b; | |
692 | if (t > BUS_MATCH_ARG_NAMESPACE_LAST) | |
693 | return -EINVAL; | |
694 | ||
695 | return t; | |
696 | } | |
697 | ||
698 | return -EINVAL; | |
699 | } | |
700 | ||
392d5b37 | 701 | static int match_component_compare(const void *a, const void *b) { |
c7819669 | 702 | const struct bus_match_component *x = a, *y = b; |
392d5b37 LP |
703 | |
704 | if (x->type < y->type) | |
705 | return -1; | |
706 | if (x->type > y->type) | |
707 | return 1; | |
708 | ||
709 | return 0; | |
710 | } | |
711 | ||
c7819669 | 712 | void bus_match_parse_free(struct bus_match_component *components, unsigned n_components) { |
392d5b37 LP |
713 | unsigned i; |
714 | ||
715 | for (i = 0; i < n_components; i++) | |
716 | free(components[i].value_str); | |
717 | ||
718 | free(components); | |
719 | } | |
720 | ||
c7819669 | 721 | int bus_match_parse( |
392d5b37 | 722 | const char *match, |
c7819669 | 723 | struct bus_match_component **_components, |
392d5b37 LP |
724 | unsigned *_n_components) { |
725 | ||
726 | const char *p = match; | |
c7819669 | 727 | struct bus_match_component *components = NULL; |
392d5b37 LP |
728 | size_t components_allocated = 0; |
729 | unsigned n_components = 0, i; | |
730 | _cleanup_free_ char *value = NULL; | |
731 | int r; | |
732 | ||
733 | assert(match); | |
734 | assert(_components); | |
735 | assert(_n_components); | |
736 | ||
737 | while (*p != 0) { | |
738 | const char *eq, *q; | |
739 | enum bus_match_node_type t; | |
740 | unsigned j = 0; | |
741 | size_t value_allocated = 0; | |
bc6422cb | 742 | bool escaped = false, quoted; |
392d5b37 LP |
743 | uint8_t u; |
744 | ||
745 | eq = strchr(p, '='); | |
746 | if (!eq) | |
747 | return -EINVAL; | |
748 | ||
392d5b37 LP |
749 | t = bus_match_node_type_from_string(p, eq - p); |
750 | if (t < 0) | |
751 | return -EINVAL; | |
752 | ||
bc6422cb LP |
753 | quoted = eq[1] == '\''; |
754 | ||
755 | for (q = eq + 1 + quoted;; q++) { | |
392d5b37 LP |
756 | |
757 | if (*q == 0) { | |
bc6422cb LP |
758 | |
759 | if (quoted) { | |
760 | r = -EINVAL; | |
761 | goto fail; | |
762 | } else { | |
763 | if (value) | |
764 | value[j] = 0; | |
765 | break; | |
766 | } | |
392d5b37 LP |
767 | } |
768 | ||
769 | if (!escaped) { | |
770 | if (*q == '\\') { | |
771 | escaped = true; | |
772 | continue; | |
773 | } | |
bc6422cb LP |
774 | |
775 | if (quoted) { | |
776 | if (*q == '\'') { | |
777 | if (value) | |
778 | value[j] = 0; | |
779 | break; | |
780 | } | |
781 | } else { | |
782 | if (*q == ',') { | |
783 | if (value) | |
784 | value[j] = 0; | |
785 | ||
786 | break; | |
787 | } | |
392d5b37 LP |
788 | } |
789 | } | |
790 | ||
2244a6fb | 791 | if (!GREEDY_REALLOC(value, value_allocated, j + 2)) { |
392d5b37 LP |
792 | r = -ENOMEM; |
793 | goto fail; | |
794 | } | |
795 | ||
796 | value[j++] = *q; | |
797 | escaped = false; | |
798 | } | |
799 | ||
2c8d477a LP |
800 | if (!value) { |
801 | value = strdup(""); | |
802 | if (!value) { | |
803 | r = -ENOMEM; | |
804 | goto fail; | |
805 | } | |
806 | } | |
807 | ||
392d5b37 LP |
808 | if (t == BUS_MATCH_MESSAGE_TYPE) { |
809 | r = bus_message_type_from_string(value, &u); | |
810 | if (r < 0) | |
811 | goto fail; | |
812 | ||
813 | free(value); | |
814 | value = NULL; | |
815 | } else | |
816 | u = 0; | |
817 | ||
2244a6fb | 818 | if (!GREEDY_REALLOC(components, components_allocated, n_components + 1)) { |
392d5b37 LP |
819 | r = -ENOMEM; |
820 | goto fail; | |
821 | } | |
822 | ||
823 | components[n_components].type = t; | |
824 | components[n_components].value_str = value; | |
825 | components[n_components].value_u8 = u; | |
826 | n_components++; | |
827 | ||
828 | value = NULL; | |
829 | ||
a3e648cc | 830 | if (q[quoted] == 0) |
392d5b37 LP |
831 | break; |
832 | ||
bc6422cb | 833 | if (q[quoted] != ',') { |
392d5b37 LP |
834 | r = -EINVAL; |
835 | goto fail; | |
836 | } | |
837 | ||
bc6422cb | 838 | p = q + 1 + quoted; |
392d5b37 LP |
839 | } |
840 | ||
841 | /* Order the whole thing, so that we always generate the same tree */ | |
7ff7394d | 842 | qsort_safe(components, n_components, sizeof(struct bus_match_component), match_component_compare); |
392d5b37 LP |
843 | |
844 | /* Check for duplicates */ | |
845 | for (i = 0; i+1 < n_components; i++) | |
846 | if (components[i].type == components[i+1].type) { | |
847 | r = -EINVAL; | |
848 | goto fail; | |
849 | } | |
850 | ||
851 | *_components = components; | |
852 | *_n_components = n_components; | |
853 | ||
854 | return 0; | |
855 | ||
856 | fail: | |
c7819669 | 857 | bus_match_parse_free(components, n_components); |
392d5b37 LP |
858 | return r; |
859 | } | |
860 | ||
53461b74 LP |
861 | char *bus_match_to_string(struct bus_match_component *components, unsigned n_components) { |
862 | _cleanup_free_ FILE *f = NULL; | |
863 | char *buffer = NULL; | |
864 | size_t size = 0; | |
865 | unsigned i; | |
866 | ||
867 | if (n_components <= 0) | |
868 | return strdup(""); | |
869 | ||
870 | assert(components); | |
871 | ||
872 | f = open_memstream(&buffer, &size); | |
873 | if (!f) | |
874 | return NULL; | |
875 | ||
876 | for (i = 0; i < n_components; i++) { | |
877 | char buf[32]; | |
878 | ||
879 | if (i != 0) | |
880 | fputc(',', f); | |
881 | ||
882 | fputs(bus_match_node_type_to_string(components[i].type, buf, sizeof(buf)), f); | |
883 | fputc('=', f); | |
884 | fputc('\'', f); | |
885 | ||
886 | if (components[i].type == BUS_MATCH_MESSAGE_TYPE) | |
887 | fputs(bus_message_type_to_string(components[i].value_u8), f); | |
888 | else | |
889 | fputs(components[i].value_str, f); | |
890 | ||
891 | fputc('\'', f); | |
892 | } | |
893 | ||
894 | fflush(f); | |
895 | if (ferror(f)) | |
896 | return NULL; | |
897 | ||
898 | return buffer; | |
899 | } | |
900 | ||
392d5b37 LP |
901 | int bus_match_add( |
902 | struct bus_match_node *root, | |
c7819669 LP |
903 | struct bus_match_component *components, |
904 | unsigned n_components, | |
19befb2d | 905 | struct match_callback *callback) { |
392d5b37 | 906 | |
c7819669 | 907 | unsigned i; |
392d5b37 LP |
908 | struct bus_match_node *n; |
909 | int r; | |
910 | ||
911 | assert(root); | |
19befb2d | 912 | assert(callback); |
392d5b37 LP |
913 | |
914 | n = root; | |
915 | for (i = 0; i < n_components; i++) { | |
916 | r = bus_match_add_compare_value( | |
917 | n, components[i].type, | |
918 | components[i].value_u8, components[i].value_str, &n); | |
919 | if (r < 0) | |
c7819669 | 920 | return r; |
392d5b37 LP |
921 | } |
922 | ||
19befb2d LP |
923 | return bus_match_add_leaf(n, callback); |
924 | } | |
392d5b37 | 925 | |
19befb2d LP |
926 | int bus_match_remove( |
927 | struct bus_match_node *root, | |
928 | struct match_callback *callback) { | |
392d5b37 | 929 | |
19befb2d LP |
930 | struct bus_match_node *node, *pp; |
931 | ||
932 | assert(root); | |
933 | assert(callback); | |
934 | ||
935 | node = callback->match_node; | |
936 | if (!node) | |
937 | return 0; | |
938 | ||
939 | assert(node->type == BUS_MATCH_LEAF); | |
940 | ||
941 | callback->match_node = NULL; | |
942 | ||
943 | /* Free the leaf */ | |
944 | pp = node->parent; | |
945 | bus_match_node_free(node); | |
946 | ||
947 | /* Prune the tree above */ | |
948 | while (pp) { | |
949 | node = pp; | |
950 | pp = node->parent; | |
951 | ||
952 | if (!bus_match_node_maybe_free(node)) | |
953 | break; | |
954 | } | |
955 | ||
956 | return 1; | |
392d5b37 LP |
957 | } |
958 | ||
19befb2d | 959 | int bus_match_find( |
392d5b37 | 960 | struct bus_match_node *root, |
c7819669 LP |
961 | struct bus_match_component *components, |
962 | unsigned n_components, | |
52f3ba91 | 963 | sd_bus_message_handler_t callback, |
c7819669 | 964 | void *userdata, |
19befb2d | 965 | struct match_callback **ret) { |
392d5b37 | 966 | |
392d5b37 | 967 | struct bus_match_node *n, **gc; |
19befb2d | 968 | unsigned i; |
392d5b37 LP |
969 | int r; |
970 | ||
971 | assert(root); | |
19befb2d | 972 | assert(ret); |
392d5b37 LP |
973 | |
974 | gc = newa(struct bus_match_node*, n_components); | |
975 | ||
976 | n = root; | |
977 | for (i = 0; i < n_components; i++) { | |
978 | r = bus_match_find_compare_value( | |
979 | n, components[i].type, | |
980 | components[i].value_u8, components[i].value_str, | |
981 | &n); | |
982 | if (r <= 0) | |
c7819669 | 983 | return r; |
392d5b37 LP |
984 | |
985 | gc[i] = n; | |
986 | } | |
987 | ||
988 | r = bus_match_find_leaf(n, callback, userdata, &n); | |
989 | if (r <= 0) | |
c7819669 LP |
990 | return r; |
991 | ||
19befb2d LP |
992 | *ret = n->leaf.callback; |
993 | return 1; | |
392d5b37 LP |
994 | } |
995 | ||
996 | void bus_match_free(struct bus_match_node *node) { | |
997 | struct bus_match_node *c; | |
998 | ||
999 | if (!node) | |
1000 | return; | |
1001 | ||
1002 | if (BUS_MATCH_CAN_HASH(node->type)) { | |
1003 | Iterator i; | |
1004 | ||
1005 | HASHMAP_FOREACH(c, node->compare.children, i) | |
1006 | bus_match_free(c); | |
1007 | ||
1008 | assert(hashmap_isempty(node->compare.children)); | |
1009 | } | |
1010 | ||
1011 | while ((c = node->child)) | |
1012 | bus_match_free(c); | |
1013 | ||
1014 | if (node->type != BUS_MATCH_ROOT) | |
1015 | bus_match_node_free(node); | |
1016 | } | |
1017 | ||
1018 | const char* bus_match_node_type_to_string(enum bus_match_node_type t, char buf[], size_t l) { | |
1019 | switch (t) { | |
1020 | ||
1021 | case BUS_MATCH_ROOT: | |
1022 | return "root"; | |
1023 | ||
1024 | case BUS_MATCH_VALUE: | |
1025 | return "value"; | |
1026 | ||
1027 | case BUS_MATCH_LEAF: | |
1028 | return "leaf"; | |
1029 | ||
1030 | case BUS_MATCH_MESSAGE_TYPE: | |
1031 | return "type"; | |
1032 | ||
1033 | case BUS_MATCH_SENDER: | |
1034 | return "sender"; | |
1035 | ||
1036 | case BUS_MATCH_DESTINATION: | |
1037 | return "destination"; | |
1038 | ||
1039 | case BUS_MATCH_INTERFACE: | |
1040 | return "interface"; | |
1041 | ||
1042 | case BUS_MATCH_MEMBER: | |
1043 | return "member"; | |
1044 | ||
1045 | case BUS_MATCH_PATH: | |
1046 | return "path"; | |
1047 | ||
1048 | case BUS_MATCH_PATH_NAMESPACE: | |
1049 | return "path_namespace"; | |
1050 | ||
1051 | case BUS_MATCH_ARG ... BUS_MATCH_ARG_LAST: | |
1052 | snprintf(buf, l, "arg%i", t - BUS_MATCH_ARG); | |
1053 | return buf; | |
1054 | ||
1055 | case BUS_MATCH_ARG_PATH ... BUS_MATCH_ARG_PATH_LAST: | |
1056 | snprintf(buf, l, "arg%ipath", t - BUS_MATCH_ARG_PATH); | |
1057 | return buf; | |
1058 | ||
1059 | case BUS_MATCH_ARG_NAMESPACE ... BUS_MATCH_ARG_NAMESPACE_LAST: | |
1060 | snprintf(buf, l, "arg%inamespace", t - BUS_MATCH_ARG_NAMESPACE); | |
1061 | return buf; | |
1062 | ||
1063 | default: | |
1064 | return NULL; | |
1065 | } | |
1066 | } | |
1067 | ||
1068 | void bus_match_dump(struct bus_match_node *node, unsigned level) { | |
1069 | struct bus_match_node *c; | |
1070 | _cleanup_free_ char *pfx = NULL; | |
1071 | char buf[32]; | |
1072 | ||
1073 | if (!node) | |
1074 | return; | |
1075 | ||
1076 | pfx = strrep(" ", level); | |
1077 | printf("%s[%s]", strempty(pfx), bus_match_node_type_to_string(node->type, buf, sizeof(buf))); | |
1078 | ||
1079 | if (node->type == BUS_MATCH_VALUE) { | |
1080 | if (node->parent->type == BUS_MATCH_MESSAGE_TYPE) | |
1081 | printf(" <%u>\n", node->value.u8); | |
1082 | else | |
1083 | printf(" <%s>\n", node->value.str); | |
1084 | } else if (node->type == BUS_MATCH_ROOT) | |
1085 | puts(" root"); | |
1086 | else if (node->type == BUS_MATCH_LEAF) | |
19befb2d | 1087 | printf(" %p/%p\n", node->leaf.callback->callback, container_of(node->leaf.callback, sd_bus_slot, match_callback)->userdata); |
392d5b37 LP |
1088 | else |
1089 | putchar('\n'); | |
1090 | ||
1091 | if (BUS_MATCH_CAN_HASH(node->type)) { | |
1092 | Iterator i; | |
1093 | ||
1094 | HASHMAP_FOREACH(c, node->compare.children, i) | |
1095 | bus_match_dump(c, level + 1); | |
1096 | } | |
1097 | ||
1098 | for (c = node->child; c; c = c->next) | |
1099 | bus_match_dump(c, level + 1); | |
1100 | } |