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6629161f 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 | ||
7211f918 LP |
22 | #ifdef HAVE_VALGRIND_MEMCHECK_H |
23 | #include <valgrind/memcheck.h> | |
24 | #endif | |
25 | ||
6629161f | 26 | #include <fcntl.h> |
c556fe79 | 27 | #include <malloc.h> |
fd8d62d9 | 28 | #include <sys/mman.h> |
5972fe95 | 29 | #include <sys/prctl.h> |
6629161f LP |
30 | |
31 | #include "util.h" | |
65dae17a | 32 | #include "strv.h" |
6629161f LP |
33 | |
34 | #include "bus-internal.h" | |
35 | #include "bus-message.h" | |
36 | #include "bus-kernel.h" | |
a56f19c4 | 37 | #include "bus-bloom.h" |
777d7a61 | 38 | #include "bus-util.h" |
751bc6ac | 39 | #include "cgroup-util.h" |
777d7a61 LP |
40 | |
41 | #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t)) | |
6629161f | 42 | |
c7819669 | 43 | int bus_kernel_parse_unique_name(const char *s, uint64_t *id) { |
6629161f LP |
44 | int r; |
45 | ||
46 | assert(s); | |
47 | assert(id); | |
48 | ||
49 | if (!startswith(s, ":1.")) | |
50 | return 0; | |
51 | ||
52 | r = safe_atou64(s + 3, id); | |
53 | if (r < 0) | |
54 | return r; | |
55 | ||
56 | return 1; | |
57 | } | |
58 | ||
febfd508 | 59 | static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) { |
6629161f | 60 | assert(d); |
6629161f LP |
61 | assert(sz > 0); |
62 | ||
e86b80b8 LP |
63 | *d = ALIGN8_PTR(*d); |
64 | ||
66b26c5c LP |
65 | /* Note that p can be NULL, which encodes a region full of |
66 | * zeroes, which is useful to optimize certain padding | |
67 | * conditions */ | |
68 | ||
febfd508 | 69 | (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec); |
ea1edece | 70 | (*d)->type = KDBUS_ITEM_PAYLOAD_VEC; |
a392d361 | 71 | (*d)->vec.address = PTR_TO_UINT64(p); |
6629161f LP |
72 | (*d)->vec.size = sz; |
73 | ||
febfd508 | 74 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
75 | } |
76 | ||
a392d361 LP |
77 | static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t sz) { |
78 | assert(d); | |
79 | assert(memfd >= 0); | |
80 | assert(sz > 0); | |
81 | ||
82 | *d = ALIGN8_PTR(*d); | |
83 | (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd); | |
ea1edece | 84 | (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD; |
a392d361 LP |
85 | (*d)->memfd.fd = memfd; |
86 | (*d)->memfd.size = sz; | |
87 | ||
88 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); | |
89 | } | |
90 | ||
febfd508 | 91 | static void append_destination(struct kdbus_item **d, const char *s, size_t length) { |
6629161f | 92 | assert(d); |
b5baa8fe | 93 | assert(s); |
6629161f | 94 | |
e86b80b8 LP |
95 | *d = ALIGN8_PTR(*d); |
96 | ||
febfd508 | 97 | (*d)->size = offsetof(struct kdbus_item, str) + length + 1; |
ea1edece | 98 | (*d)->type = KDBUS_ITEM_DST_NAME; |
51038c03 | 99 | memcpy((*d)->str, s, length + 1); |
6629161f | 100 | |
febfd508 | 101 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
102 | } |
103 | ||
febfd508 | 104 | static void* append_bloom(struct kdbus_item **d, size_t length) { |
a56f19c4 LP |
105 | void *r; |
106 | ||
b5baa8fe | 107 | assert(d); |
b5baa8fe LP |
108 | |
109 | *d = ALIGN8_PTR(*d); | |
110 | ||
febfd508 | 111 | (*d)->size = offsetof(struct kdbus_item, data) + length; |
ea1edece | 112 | (*d)->type = KDBUS_ITEM_BLOOM; |
a56f19c4 | 113 | r = (*d)->data; |
b5baa8fe | 114 | |
febfd508 | 115 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
a56f19c4 LP |
116 | |
117 | return r; | |
118 | } | |
119 | ||
febfd508 | 120 | static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) { |
9097fe29 LP |
121 | assert(d); |
122 | assert(fds); | |
123 | assert(n_fds > 0); | |
124 | ||
125 | *d = ALIGN8_PTR(*d); | |
febfd508 | 126 | (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds; |
ea1edece | 127 | (*d)->type = KDBUS_ITEM_FDS; |
9097fe29 LP |
128 | memcpy((*d)->fds, fds, sizeof(int) * n_fds); |
129 | ||
febfd508 | 130 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
9097fe29 LP |
131 | } |
132 | ||
a56f19c4 LP |
133 | static int bus_message_setup_bloom(sd_bus_message *m, void *bloom) { |
134 | unsigned i; | |
135 | int r; | |
136 | ||
137 | assert(m); | |
138 | assert(bloom); | |
139 | ||
140 | memset(bloom, 0, BLOOM_SIZE); | |
141 | ||
142 | bloom_add_pair(bloom, "message-type", bus_message_type_to_string(m->header->type)); | |
143 | ||
144 | if (m->interface) | |
145 | bloom_add_pair(bloom, "interface", m->interface); | |
146 | if (m->member) | |
147 | bloom_add_pair(bloom, "member", m->member); | |
148 | if (m->path) { | |
149 | bloom_add_pair(bloom, "path", m->path); | |
f11e11e3 | 150 | bloom_add_pair(bloom, "path-slash-prefix", m->path); |
a56f19c4 LP |
151 | bloom_add_prefixes(bloom, "path-slash-prefix", m->path, '/'); |
152 | } | |
153 | ||
154 | r = sd_bus_message_rewind(m, true); | |
155 | if (r < 0) | |
156 | return r; | |
157 | ||
158 | for (i = 0; i < 64; i++) { | |
159 | char type; | |
160 | const char *t; | |
161 | char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")]; | |
162 | char *e; | |
163 | ||
164 | r = sd_bus_message_peek_type(m, &type, NULL); | |
165 | if (r < 0) | |
166 | return r; | |
167 | ||
168 | if (type != SD_BUS_TYPE_STRING && | |
169 | type != SD_BUS_TYPE_OBJECT_PATH && | |
170 | type != SD_BUS_TYPE_SIGNATURE) | |
171 | break; | |
172 | ||
173 | r = sd_bus_message_read_basic(m, type, &t); | |
174 | if (r < 0) | |
175 | return r; | |
176 | ||
177 | e = stpcpy(buf, "arg"); | |
178 | if (i < 10) | |
693eb9a2 | 179 | *(e++) = '0' + (char) i; |
a56f19c4 | 180 | else { |
693eb9a2 LP |
181 | *(e++) = '0' + (char) (i / 10); |
182 | *(e++) = '0' + (char) (i % 10); | |
a56f19c4 LP |
183 | } |
184 | ||
185 | *e = 0; | |
186 | bloom_add_pair(bloom, buf, t); | |
187 | ||
188 | strcpy(e, "-dot-prefix"); | |
189 | bloom_add_prefixes(bloom, buf, t, '.'); | |
190 | strcpy(e, "-slash-prefix"); | |
191 | bloom_add_prefixes(bloom, buf, t, '/'); | |
192 | } | |
193 | ||
194 | return 0; | |
b5baa8fe LP |
195 | } |
196 | ||
5b7d4c1c | 197 | static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { |
9b29bb68 | 198 | struct bus_body_part *part; |
febfd508 | 199 | struct kdbus_item *d; |
6629161f LP |
200 | bool well_known; |
201 | uint64_t unique; | |
202 | size_t sz, dl; | |
9b29bb68 | 203 | unsigned i; |
6629161f LP |
204 | int r; |
205 | ||
5b7d4c1c | 206 | assert(b); |
6629161f LP |
207 | assert(m); |
208 | assert(m->sealed); | |
e9a967f9 | 209 | |
069f5e61 LP |
210 | /* We put this together only once, if this message is reused |
211 | * we reuse the earlier-built version */ | |
e9a967f9 LP |
212 | if (m->kdbus) |
213 | return 0; | |
6629161f LP |
214 | |
215 | if (m->destination) { | |
c7819669 | 216 | r = bus_kernel_parse_unique_name(m->destination, &unique); |
6629161f LP |
217 | if (r < 0) |
218 | return r; | |
219 | ||
220 | well_known = r == 0; | |
221 | } else | |
222 | well_known = false; | |
223 | ||
b1454bf0 | 224 | sz = offsetof(struct kdbus_msg, items); |
6629161f | 225 | |
a392d361 LP |
226 | assert_cc(ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)) == |
227 | ALIGN8(offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd))); | |
228 | ||
69aec65c | 229 | /* Add in fixed header, fields header and payload */ |
c91cb83c | 230 | sz += (1 + m->n_body_parts) * |
bc7fd8cd | 231 | ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)); |
6629161f | 232 | |
69aec65c | 233 | /* Add space for bloom filter */ |
febfd508 | 234 | sz += ALIGN8(offsetof(struct kdbus_item, data) + BLOOM_SIZE); |
b5baa8fe | 235 | |
6629161f LP |
236 | /* Add in well-known destination header */ |
237 | if (well_known) { | |
238 | dl = strlen(m->destination); | |
febfd508 | 239 | sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1); |
6629161f LP |
240 | } |
241 | ||
9097fe29 LP |
242 | /* Add space for unix fds */ |
243 | if (m->n_fds > 0) | |
febfd508 | 244 | sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds); |
9097fe29 | 245 | |
c556fe79 | 246 | m->kdbus = memalign(8, sz); |
66b26c5c LP |
247 | if (!m->kdbus) { |
248 | r = -ENOMEM; | |
249 | goto fail; | |
250 | } | |
6629161f | 251 | |
66b26c5c | 252 | m->free_kdbus = true; |
d9115e18 LP |
253 | memset(m->kdbus, 0, sz); |
254 | ||
6629161f | 255 | m->kdbus->flags = |
0461f8cd | 256 | ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) | |
97f82db3 | 257 | ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0); |
6629161f LP |
258 | m->kdbus->dst_id = |
259 | well_known ? 0 : | |
b5baa8fe | 260 | m->destination ? unique : KDBUS_DST_ID_BROADCAST; |
6647dc66 | 261 | m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; |
6629161f | 262 | m->kdbus->cookie = m->header->serial; |
80a33f11 KS |
263 | |
264 | if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) | |
693eb9a2 | 265 | m->kdbus->cookie_reply = m->reply_cookie; |
80a33f11 KS |
266 | else |
267 | m->kdbus->timeout_ns = m->timeout * NSEC_PER_USEC; | |
6629161f | 268 | |
b1454bf0 | 269 | d = m->kdbus->items; |
6629161f LP |
270 | |
271 | if (well_known) | |
272 | append_destination(&d, m->destination, dl); | |
273 | ||
c91cb83c | 274 | append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
a392d361 LP |
275 | |
276 | MESSAGE_FOREACH_PART(part, i, m) { | |
277 | if (part->is_zero) { | |
66b26c5c LP |
278 | /* If this is padding then simply send a |
279 | * vector with a NULL data pointer which the | |
280 | * kernel will just pass through. This is the | |
281 | * most efficient way to encode zeroes */ | |
282 | ||
a392d361 LP |
283 | append_payload_vec(&d, NULL, part->size); |
284 | continue; | |
285 | } | |
286 | ||
66b26c5c LP |
287 | if (part->memfd >= 0 && part->sealed && m->destination) { |
288 | /* Try to send a memfd, if the part is | |
289 | * sealed and this is not a broadcast. Since we can only */ | |
a392d361 | 290 | |
66b26c5c LP |
291 | append_payload_memfd(&d, part->memfd, part->size); |
292 | continue; | |
a392d361 LP |
293 | } |
294 | ||
66b26c5c LP |
295 | /* Otherwise let's send a vector to the actual data, |
296 | * for that we need to map it first. */ | |
297 | r = bus_body_part_map(part); | |
298 | if (r < 0) | |
299 | goto fail; | |
a392d361 | 300 | |
bc7fd8cd | 301 | append_payload_vec(&d, part->data, part->size); |
a392d361 | 302 | } |
6629161f | 303 | |
5b7d4c1c LP |
304 | if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) { |
305 | void *p; | |
306 | ||
a56f19c4 LP |
307 | p = append_bloom(&d, BLOOM_SIZE); |
308 | r = bus_message_setup_bloom(m, p); | |
a392d361 LP |
309 | if (r < 0) |
310 | goto fail; | |
5b7d4c1c | 311 | } |
b5baa8fe | 312 | |
9097fe29 LP |
313 | if (m->n_fds > 0) |
314 | append_fds(&d, m->fds, m->n_fds); | |
315 | ||
e9a967f9 | 316 | m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus; |
6629161f LP |
317 | assert(m->kdbus->size <= sz); |
318 | ||
319 | return 0; | |
a392d361 LP |
320 | |
321 | fail: | |
66b26c5c | 322 | m->poisoned = true; |
a392d361 | 323 | return r; |
6629161f LP |
324 | } |
325 | ||
cb67f718 DM |
326 | static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { |
327 | sd_bus_message *m = NULL; | |
328 | struct kdbus_item *d; | |
329 | unsigned n_fds = 0; | |
330 | _cleanup_free_ int *fds = NULL; | |
331 | struct bus_header *h = NULL; | |
332 | size_t total, n_bytes = 0, idx = 0; | |
333 | const char *destination = NULL, *seclabel = NULL; | |
6629161f LP |
334 | int r; |
335 | ||
cb67f718 DM |
336 | assert(bus); |
337 | assert(k); | |
338 | assert(k->payload_type == KDBUS_PAYLOAD_DBUS); | |
35460afc | 339 | |
cb67f718 DM |
340 | KDBUS_ITEM_FOREACH(d, k, items) { |
341 | size_t l; | |
f08838da | 342 | |
cb67f718 | 343 | l = d->size - offsetof(struct kdbus_item, data); |
8f155917 | 344 | |
cb67f718 | 345 | switch (d->type) { |
62b3e928 | 346 | |
cb67f718 DM |
347 | case KDBUS_ITEM_PAYLOAD_OFF: |
348 | if (!h) { | |
349 | h = (struct bus_header *)((uint8_t *)k + d->vec.offset); | |
8a0e0ed9 | 350 | |
cb67f718 DM |
351 | if (!bus_header_is_complete(h, d->vec.size)) |
352 | return -EBADMSG; | |
353 | } | |
8a0e0ed9 | 354 | |
cb67f718 DM |
355 | n_bytes += d->vec.size; |
356 | break; | |
8a0e0ed9 | 357 | |
cb67f718 DM |
358 | case KDBUS_ITEM_PAYLOAD_MEMFD: |
359 | if (!h) | |
360 | return -EBADMSG; | |
8a0e0ed9 | 361 | |
cb67f718 DM |
362 | n_bytes += d->memfd.size; |
363 | break; | |
8a0e0ed9 | 364 | |
cb67f718 DM |
365 | case KDBUS_ITEM_FDS: { |
366 | int *f; | |
367 | unsigned j; | |
8a0e0ed9 | 368 | |
cb67f718 DM |
369 | j = l / sizeof(int); |
370 | f = realloc(fds, sizeof(int) * (n_fds + j)); | |
371 | if (!f) | |
372 | return -ENOMEM; | |
8a0e0ed9 | 373 | |
cb67f718 DM |
374 | fds = f; |
375 | memcpy(fds + n_fds, d->fds, sizeof(int) * j); | |
376 | n_fds += j; | |
377 | break; | |
378 | } | |
62b3e928 | 379 | |
cb67f718 DM |
380 | case KDBUS_ITEM_SECLABEL: |
381 | seclabel = d->str; | |
382 | break; | |
fd8d62d9 LP |
383 | } |
384 | } | |
385 | ||
cb67f718 DM |
386 | if (!h) |
387 | return -EBADMSG; | |
de297575 | 388 | |
cb67f718 DM |
389 | r = bus_header_message_size(h, &total); |
390 | if (r < 0) | |
391 | return r; | |
219728b3 | 392 | |
cb67f718 DM |
393 | if (n_bytes != total) |
394 | return -EBADMSG; | |
6629161f | 395 | |
cb67f718 DM |
396 | /* on kdbus we only speak native endian gvariant, never dbus1 |
397 | * marshalling or reverse endian */ | |
398 | if (h->version != 2 || | |
399 | h->endian != BUS_NATIVE_ENDIAN) | |
400 | return -EPROTOTYPE; | |
c58dea19 | 401 | |
cb67f718 DM |
402 | r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m); |
403 | if (r < 0) | |
404 | return r; | |
6629161f | 405 | |
cb67f718 DM |
406 | /* The well-known names list is different from the other |
407 | credentials. If we asked for it, but nothing is there, this | |
408 | means that the list of well-known names is simply empty, not | |
409 | that we lack any data */ | |
35460afc | 410 | |
cb67f718 | 411 | m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask; |
f08838da | 412 | |
cb67f718 DM |
413 | KDBUS_ITEM_FOREACH(d, k, items) { |
414 | size_t l; | |
6629161f | 415 | |
cb67f718 | 416 | l = d->size - offsetof(struct kdbus_item, data); |
6629161f | 417 | |
cb67f718 | 418 | switch (d->type) { |
6629161f | 419 | |
cb67f718 DM |
420 | case KDBUS_ITEM_PAYLOAD_OFF: { |
421 | size_t begin_body; | |
6629161f | 422 | |
cb67f718 | 423 | begin_body = BUS_MESSAGE_BODY_BEGIN(m); |
6629161f | 424 | |
cb67f718 DM |
425 | if (idx + d->vec.size > begin_body) { |
426 | struct bus_body_part *part; | |
a43b9ca3 | 427 | |
cb67f718 | 428 | /* Contains body material */ |
6629161f | 429 | |
cb67f718 DM |
430 | part = message_append_part(m); |
431 | if (!part) { | |
432 | r = -ENOMEM; | |
433 | goto fail; | |
434 | } | |
a43b9ca3 | 435 | |
cb67f718 DM |
436 | /* A -1 offset is NUL padding. */ |
437 | part->is_zero = d->vec.offset == ~0ULL; | |
a43b9ca3 | 438 | |
cb67f718 DM |
439 | if (idx >= begin_body) { |
440 | if (!part->is_zero) | |
441 | part->data = (uint8_t *)k + d->vec.offset; | |
442 | part->size = d->vec.size; | |
443 | } else { | |
444 | if (!part->is_zero) | |
445 | part->data = (uint8_t *)k + d->vec.offset + (begin_body - idx); | |
446 | part->size = d->vec.size - (begin_body - idx); | |
447 | } | |
a43b9ca3 | 448 | |
cb67f718 | 449 | part->sealed = true; |
ff4994c5 | 450 | } |
a43b9ca3 | 451 | |
cb67f718 DM |
452 | idx += d->vec.size; |
453 | break; | |
454 | } | |
a43b9ca3 | 455 | |
cb67f718 DM |
456 | case KDBUS_ITEM_PAYLOAD_MEMFD: { |
457 | struct bus_body_part *part; | |
a43b9ca3 | 458 | |
cb67f718 DM |
459 | if (idx < BUS_MESSAGE_BODY_BEGIN(m)) { |
460 | r = -EBADMSG; | |
461 | goto fail; | |
ff4994c5 | 462 | } |
a43b9ca3 | 463 | |
cb67f718 DM |
464 | part = message_append_part(m); |
465 | if (!part) { | |
466 | r = -ENOMEM; | |
467 | goto fail; | |
468 | } | |
a43b9ca3 | 469 | |
cb67f718 DM |
470 | part->memfd = d->memfd.fd; |
471 | part->size = d->memfd.size; | |
472 | part->sealed = true; | |
a43b9ca3 | 473 | |
cb67f718 DM |
474 | idx += d->memfd.size; |
475 | break; | |
476 | } | |
a43b9ca3 | 477 | |
cb67f718 DM |
478 | case KDBUS_ITEM_CREDS: |
479 | /* UID/GID/PID are always valid */ | |
480 | m->creds.uid = (uid_t) d->creds.uid; | |
481 | m->creds.gid = (gid_t) d->creds.gid; | |
482 | m->creds.pid = (pid_t) d->creds.pid; | |
483 | m->creds.mask |= (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID) & bus->creds_mask; | |
a43b9ca3 | 484 | |
cb67f718 DM |
485 | /* The PID starttime/TID might be missing |
486 | * however, when the data is faked by some | |
487 | * data bus proxy and it lacks that | |
488 | * information about the real client since | |
489 | * SO_PEERCRED is used for that */ | |
6629161f | 490 | |
cb67f718 DM |
491 | if (d->creds.starttime > 0) { |
492 | m->creds.pid_starttime = d->creds.starttime / NSEC_PER_USEC; | |
493 | m->creds.mask |= SD_BUS_CREDS_PID_STARTTIME & bus->creds_mask; | |
494 | } | |
6629161f | 495 | |
cb67f718 DM |
496 | if (d->creds.tid > 0) { |
497 | m->creds.tid = (pid_t) d->creds.tid; | |
498 | m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask; | |
499 | } | |
500 | break; | |
6629161f | 501 | |
cb67f718 DM |
502 | case KDBUS_ITEM_TIMESTAMP: |
503 | m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC; | |
504 | m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC; | |
6a0e376c | 505 | m->seqnum = d->timestamp.seqnum; |
cb67f718 | 506 | break; |
fd8d62d9 | 507 | |
cb67f718 DM |
508 | case KDBUS_ITEM_PID_COMM: |
509 | m->creds.comm = d->str; | |
510 | m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask; | |
511 | break; | |
fd8d62d9 | 512 | |
cb67f718 DM |
513 | case KDBUS_ITEM_TID_COMM: |
514 | m->creds.tid_comm = d->str; | |
515 | m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask; | |
516 | break; | |
6629161f | 517 | |
cb67f718 DM |
518 | case KDBUS_ITEM_EXE: |
519 | m->creds.exe = d->str; | |
520 | m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask; | |
521 | break; | |
6629161f | 522 | |
cb67f718 DM |
523 | case KDBUS_ITEM_CMDLINE: |
524 | m->creds.cmdline = d->str; | |
525 | m->creds.cmdline_size = l; | |
526 | m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask; | |
527 | break; | |
777d7a61 | 528 | |
cb67f718 DM |
529 | case KDBUS_ITEM_CGROUP: |
530 | m->creds.cgroup = d->str; | |
531 | m->creds.mask |= (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID) & bus->creds_mask; | |
777d7a61 | 532 | |
cb67f718 DM |
533 | if (!bus->cgroup_root) { |
534 | r = cg_get_root_path(&bus->cgroup_root); | |
535 | if (r < 0) | |
536 | goto fail; | |
537 | } | |
777d7a61 | 538 | |
cb67f718 | 539 | m->creds.cgroup_root = bus->cgroup_root; |
777d7a61 | 540 | |
cb67f718 | 541 | break; |
777d7a61 | 542 | |
cb67f718 DM |
543 | case KDBUS_ITEM_AUDIT: |
544 | m->creds.audit_session_id = (uint32_t) d->audit.sessionid; | |
545 | m->creds.audit_login_uid = (uid_t) d->audit.loginuid; | |
546 | m->creds.mask |= (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID) & bus->creds_mask; | |
547 | break; | |
777d7a61 | 548 | |
cb67f718 DM |
549 | case KDBUS_ITEM_CAPS: |
550 | m->creds.capability = d->data; | |
551 | m->creds.capability_size = l; | |
552 | m->creds.mask |= (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS) & bus->creds_mask; | |
553 | break; | |
219728b3 | 554 | |
cb67f718 DM |
555 | case KDBUS_ITEM_DST_NAME: |
556 | if (!service_name_is_valid(d->str)) | |
557 | return -EBADMSG; | |
219728b3 | 558 | |
cb67f718 DM |
559 | destination = d->str; |
560 | break; | |
777d7a61 | 561 | |
cb67f718 DM |
562 | case KDBUS_ITEM_NAME: |
563 | if (!service_name_is_valid(d->name.name)) | |
564 | return -EBADMSG; | |
777d7a61 | 565 | |
cb67f718 DM |
566 | r = strv_extend(&m->creds.well_known_names, d->name.name); |
567 | if (r < 0) | |
568 | goto fail; | |
569 | break; | |
777d7a61 | 570 | |
cb67f718 DM |
571 | case KDBUS_ITEM_FDS: |
572 | case KDBUS_ITEM_SECLABEL: | |
573 | break; | |
d78bf250 | 574 | |
cb67f718 DM |
575 | default: |
576 | log_debug("Got unknown field from kernel %llu", d->type); | |
577 | } | |
578 | } | |
d78bf250 | 579 | |
cb67f718 DM |
580 | r = bus_message_parse_fields(m); |
581 | if (r < 0) | |
582 | goto fail; | |
777d7a61 | 583 | |
cb67f718 DM |
584 | /* Override information from the user header with data from the kernel */ |
585 | if (k->src_id == KDBUS_SRC_ID_KERNEL) | |
586 | m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus"; | |
587 | else { | |
588 | snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id); | |
589 | m->sender = m->creds.unique_name = m->sender_buffer; | |
590 | } | |
777d7a61 | 591 | |
cb67f718 DM |
592 | if (destination) |
593 | m->destination = destination; | |
594 | else if (k->dst_id == KDBUS_DST_ID_BROADCAST) | |
595 | m->destination = NULL; | |
596 | else if (k->dst_id == KDBUS_DST_ID_NAME) | |
597 | m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */ | |
598 | else { | |
599 | snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id); | |
600 | m->destination = m->destination_buffer; | |
601 | } | |
777d7a61 | 602 | |
cb67f718 DM |
603 | /* We take possession of the kmsg struct now */ |
604 | m->kdbus = k; | |
605 | m->release_kdbus = true; | |
606 | m->free_fds = true; | |
607 | fds = NULL; | |
777d7a61 | 608 | |
cb67f718 | 609 | bus->rqueue[bus->rqueue_size++] = m; |
777d7a61 | 610 | |
cb67f718 | 611 | return 1; |
777d7a61 | 612 | |
cb67f718 DM |
613 | fail: |
614 | if (m) { | |
615 | struct bus_body_part *part; | |
616 | unsigned i; | |
777d7a61 | 617 | |
cb67f718 DM |
618 | /* Make sure the memfds are not freed twice */ |
619 | MESSAGE_FOREACH_PART(part, i, m) | |
620 | if (part->memfd >= 0) | |
621 | part->memfd = -1; | |
777d7a61 | 622 | |
cb67f718 DM |
623 | sd_bus_message_unref(m); |
624 | } | |
777d7a61 | 625 | |
cb67f718 DM |
626 | return r; |
627 | } | |
777d7a61 | 628 | |
cb67f718 DM |
629 | int bus_kernel_take_fd(sd_bus *b) { |
630 | struct kdbus_cmd_hello *hello; | |
631 | struct kdbus_item *item; | |
5972fe95 LP |
632 | _cleanup_free_ char *g = NULL; |
633 | const char *name; | |
634 | size_t l = 0, m = 0, sz; | |
cb67f718 | 635 | int r; |
777d7a61 | 636 | |
cb67f718 | 637 | assert(b); |
7adc46fc | 638 | |
cb67f718 DM |
639 | if (b->is_server) |
640 | return -EINVAL; | |
777d7a61 | 641 | |
cb67f718 | 642 | b->use_memfd = 1; |
777d7a61 | 643 | |
5972fe95 LP |
644 | if (b->connection_name) { |
645 | g = sd_bus_label_escape(b->connection_name); | |
646 | if (!g) | |
647 | return -ENOMEM; | |
648 | ||
649 | name = g; | |
650 | } else { | |
651 | char pr[17] = {}; | |
652 | ||
653 | /* If no name is explicitly set, we'll include a hint | |
654 | * indicating the library implementation, a hint which | |
655 | * kind of bus this is and the thread name */ | |
656 | ||
657 | assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0); | |
658 | ||
659 | if (isempty(pr)) { | |
660 | name = b->is_system ? "sd-system" : | |
661 | b->is_user ? "sd-user" : "sd"; | |
662 | } else { | |
663 | _cleanup_free_ char *e = NULL; | |
664 | ||
665 | e = sd_bus_label_escape(pr); | |
666 | if (!e) | |
667 | return -ENOMEM; | |
668 | ||
669 | g = strappend(b->is_system ? "sd-system-" : | |
670 | b->is_user ? "sd-user-" : "sd-", | |
671 | e); | |
672 | if (!g) | |
673 | return -ENOMEM; | |
674 | ||
675 | name = g; | |
676 | } | |
677 | ||
678 | b->connection_name = sd_bus_label_unescape(name); | |
679 | if (!b->connection_name) | |
680 | return -ENOMEM; | |
681 | } | |
682 | ||
683 | m = strlen(name); | |
684 | ||
685 | sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) + | |
686 | ALIGN8(offsetof(struct kdbus_item, str) + m + 1); | |
777d7a61 | 687 | |
cb67f718 | 688 | if (b->fake_creds_valid) |
5972fe95 | 689 | sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds)); |
777d7a61 | 690 | |
cb67f718 DM |
691 | if (b->fake_label) { |
692 | l = strlen(b->fake_label); | |
693 | sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1); | |
694 | } | |
777d7a61 | 695 | |
cb67f718 DM |
696 | hello = alloca0(sz); |
697 | hello->size = sz; | |
698 | hello->conn_flags = b->hello_flags; | |
699 | hello->attach_flags = b->attach_flags; | |
700 | hello->pool_size = KDBUS_POOL_SIZE; | |
777d7a61 | 701 | |
cb67f718 DM |
702 | item = hello->items; |
703 | ||
5972fe95 LP |
704 | item->size = offsetof(struct kdbus_item, str) + m + 1; |
705 | item->type = KDBUS_ITEM_CONN_NAME; | |
706 | memcpy(item->str, name, m + 1); | |
707 | item = KDBUS_ITEM_NEXT(item); | |
708 | ||
cb67f718 DM |
709 | if (b->fake_creds_valid) { |
710 | item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds); | |
711 | item->type = KDBUS_ITEM_CREDS; | |
712 | item->creds = b->fake_creds; | |
713 | ||
714 | item = KDBUS_ITEM_NEXT(item); | |
777d7a61 LP |
715 | } |
716 | ||
cb67f718 DM |
717 | if (b->fake_label) { |
718 | item->size = offsetof(struct kdbus_item, str) + l + 1; | |
5972fe95 | 719 | item->type = KDBUS_ITEM_SECLABEL; |
cb67f718 | 720 | memcpy(item->str, b->fake_label, l+1); |
777d7a61 LP |
721 | } |
722 | ||
cb67f718 DM |
723 | r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello); |
724 | if (r < 0) | |
725 | return -errno; | |
777d7a61 | 726 | |
cb67f718 DM |
727 | if (!b->kdbus_buffer) { |
728 | b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0); | |
729 | if (b->kdbus_buffer == MAP_FAILED) { | |
730 | b->kdbus_buffer = NULL; | |
731 | return -errno; | |
732 | } | |
733 | } | |
6629161f | 734 | |
cb67f718 DM |
735 | /* The higher 32bit of both flags fields are considered |
736 | * 'incompatible flags'. Refuse them all for now. */ | |
737 | if (hello->bus_flags > 0xFFFFFFFFULL || | |
738 | hello->conn_flags > 0xFFFFFFFFULL) | |
739 | return -ENOTSUP; | |
6629161f | 740 | |
cb67f718 DM |
741 | if (hello->bloom_size != BLOOM_SIZE) |
742 | return -ENOTSUP; | |
6629161f | 743 | |
cb67f718 DM |
744 | if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) |
745 | return -ENOMEM; | |
6629161f | 746 | |
cb67f718 | 747 | b->unique_id = hello->id; |
6629161f | 748 | |
cb67f718 DM |
749 | b->is_kernel = true; |
750 | b->bus_client = true; | |
751 | b->can_fds = !!(hello->conn_flags & KDBUS_HELLO_ACCEPT_FD); | |
752 | b->message_version = 2; | |
753 | b->message_endian = BUS_NATIVE_ENDIAN; | |
c91cb83c | 754 | |
cb67f718 DM |
755 | /* the kernel told us the UUID of the underlying bus */ |
756 | memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes)); | |
6629161f | 757 | |
cb67f718 DM |
758 | return bus_start_running(b); |
759 | } | |
6629161f | 760 | |
cb67f718 DM |
761 | int bus_kernel_connect(sd_bus *b) { |
762 | assert(b); | |
763 | assert(b->input_fd < 0); | |
764 | assert(b->output_fd < 0); | |
765 | assert(b->kernel); | |
1307c3ff | 766 | |
cb67f718 DM |
767 | if (b->is_server) |
768 | return -EINVAL; | |
1307c3ff | 769 | |
cb67f718 DM |
770 | b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC); |
771 | if (b->input_fd < 0) | |
772 | return -errno; | |
6629161f | 773 | |
cb67f718 | 774 | b->output_fd = b->input_fd; |
6629161f | 775 | |
cb67f718 DM |
776 | return bus_kernel_take_fd(b); |
777 | } | |
f9be01f3 | 778 | |
069f5e61 LP |
779 | static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { |
780 | uint64_t off; | |
781 | struct kdbus_item *d; | |
782 | ||
783 | assert(bus); | |
784 | assert(k); | |
785 | ||
786 | off = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer; | |
787 | ioctl(bus->input_fd, KDBUS_CMD_FREE, &off); | |
788 | ||
789 | KDBUS_ITEM_FOREACH(d, k, items) { | |
790 | ||
791 | if (d->type == KDBUS_ITEM_FDS) | |
792 | close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int)); | |
793 | else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD) | |
794 | close_nointr_nofail(d->memfd.fd); | |
795 | } | |
796 | } | |
797 | ||
798 | int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) { | |
cb67f718 | 799 | int r; |
6629161f | 800 | |
cb67f718 DM |
801 | assert(bus); |
802 | assert(m); | |
803 | assert(bus->state == BUS_RUNNING); | |
6629161f | 804 | |
cb67f718 DM |
805 | /* If we can't deliver, we want room for the error message */ |
806 | r = bus_rqueue_make_room(bus); | |
6629161f LP |
807 | if (r < 0) |
808 | return r; | |
809 | ||
cb67f718 | 810 | r = bus_message_setup_kmsg(bus, m); |
6629161f LP |
811 | if (r < 0) |
812 | return r; | |
813 | ||
069f5e61 LP |
814 | /* If this is a synchronous method call, then let's tell the |
815 | * kernel, so that it can pass CPU time/scheduling to the | |
816 | * destination for the time, if it wants to. If we | |
817 | * synchronously wait for the result anyway, we won't need CPU | |
818 | * anyway. */ | |
819 | if (hint_sync_call) | |
820 | m->kdbus->flags |= KDBUS_MSG_FLAGS_EXPECT_REPLY|KDBUS_MSG_FLAGS_SYNC_REPLY; | |
821 | ||
cb67f718 DM |
822 | r = ioctl(bus->output_fd, KDBUS_CMD_MSG_SEND, m->kdbus); |
823 | if (r < 0) { | |
824 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
825 | sd_bus_message *reply; | |
253ce82b | 826 | |
cb67f718 DM |
827 | if (errno == EAGAIN || errno == EINTR) |
828 | return 0; | |
829 | else if (errno == ENXIO || errno == ESRCH) { | |
6629161f | 830 | |
cb67f718 DM |
831 | /* ENXIO: unique name not known |
832 | * ESRCH: well-known name not known */ | |
6629161f | 833 | |
cb67f718 DM |
834 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
835 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination); | |
836 | else { | |
837 | log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination); | |
838 | return 0; | |
839 | } | |
777d7a61 | 840 | |
cb67f718 | 841 | } else if (errno == EADDRNOTAVAIL) { |
fd8d62d9 | 842 | |
cb67f718 | 843 | /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */ |
bc7fd8cd | 844 | |
cb67f718 DM |
845 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
846 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination); | |
847 | else { | |
848 | log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination); | |
849 | return 0; | |
850 | } | |
851 | } else | |
852 | return -errno; | |
bc7fd8cd | 853 | |
cb67f718 DM |
854 | r = bus_message_new_synthetic_error( |
855 | bus, | |
856 | BUS_MESSAGE_COOKIE(m), | |
857 | &error, | |
858 | &reply); | |
bc7fd8cd | 859 | |
cb67f718 DM |
860 | if (r < 0) |
861 | return r; | |
bc7fd8cd | 862 | |
cb67f718 DM |
863 | r = bus_seal_synthetic_message(bus, reply); |
864 | if (r < 0) | |
865 | return r; | |
62b3e928 | 866 | |
cb67f718 | 867 | bus->rqueue[bus->rqueue_size++] = reply; |
bc7fd8cd | 868 | |
069f5e61 LP |
869 | } else if (hint_sync_call) { |
870 | struct kdbus_msg *k; | |
fd8d62d9 | 871 | |
069f5e61 LP |
872 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + m->kdbus->offset_reply); |
873 | assert(k); | |
777d7a61 | 874 | |
069f5e61 | 875 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
1307c3ff | 876 | |
069f5e61 LP |
877 | r = bus_kernel_make_message(bus, k); |
878 | if (r < 0) { | |
879 | close_kdbus_msg(bus, k); | |
1307c3ff | 880 | |
069f5e61 LP |
881 | /* Anybody can send us invalid messages, let's just drop them. */ |
882 | if (r == -EBADMSG || r == -EPROTOTYPE) | |
883 | log_debug("Ignoring invalid message: %s", strerror(-r)); | |
884 | else | |
885 | return r; | |
886 | } | |
887 | } else { | |
888 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
889 | close_kdbus_msg(bus, k); | |
890 | } | |
cb67f718 | 891 | } |
069f5e61 LP |
892 | |
893 | return 1; | |
cb67f718 | 894 | } |
69aec65c | 895 | |
cb67f718 DM |
896 | static int push_name_owner_changed(sd_bus *bus, const char *name, const char *old_owner, const char *new_owner) { |
897 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; | |
898 | int r; | |
2dc9970b | 899 | |
cb67f718 | 900 | assert(bus); |
2dc9970b | 901 | |
cb67f718 DM |
902 | r = sd_bus_message_new_signal( |
903 | bus, | |
904 | "/org/freedesktop/DBus", | |
905 | "org.freedesktop.DBus", | |
906 | "NameOwnerChanged", | |
907 | &m); | |
908 | if (r < 0) | |
909 | return r; | |
2dc9970b | 910 | |
cb67f718 DM |
911 | r = sd_bus_message_append(m, "sss", name, old_owner, new_owner); |
912 | if (r < 0) | |
913 | return r; | |
5b12334d | 914 | |
cb67f718 | 915 | m->sender = "org.freedesktop.DBus"; |
5b12334d | 916 | |
cb67f718 DM |
917 | r = bus_seal_synthetic_message(bus, m); |
918 | if (r < 0) | |
919 | return r; | |
5b12334d | 920 | |
cb67f718 DM |
921 | bus->rqueue[bus->rqueue_size++] = m; |
922 | m = NULL; | |
5b12334d | 923 | |
cb67f718 DM |
924 | return 1; |
925 | } | |
5b12334d | 926 | |
cb67f718 DM |
927 | static int translate_name_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { |
928 | char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX]; | |
5b12334d | 929 | |
cb67f718 DM |
930 | assert(bus); |
931 | assert(k); | |
932 | assert(d); | |
751bc6ac | 933 | |
cb67f718 DM |
934 | if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) |
935 | old_owner[0] = 0; | |
936 | else | |
937 | sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old.id); | |
751bc6ac | 938 | |
cb67f718 | 939 | if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) { |
751bc6ac | 940 | |
cb67f718 DM |
941 | if (isempty(old_owner)) |
942 | return 0; | |
5b12334d | 943 | |
cb67f718 DM |
944 | new_owner[0] = 0; |
945 | } else | |
946 | sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new.id); | |
5b12334d | 947 | |
cb67f718 DM |
948 | return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner); |
949 | } | |
5b12334d | 950 | |
cb67f718 DM |
951 | static int translate_id_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { |
952 | char owner[UNIQUE_NAME_MAX]; | |
2e2ec0ea | 953 | |
cb67f718 DM |
954 | assert(bus); |
955 | assert(k); | |
956 | assert(d); | |
777d7a61 | 957 | |
cb67f718 | 958 | sprintf(owner, ":1.%llu", d->id_change.id); |
2e2ec0ea | 959 | |
cb67f718 DM |
960 | return push_name_owner_changed( |
961 | bus, owner, | |
962 | d->type == KDBUS_ITEM_ID_ADD ? NULL : owner, | |
963 | d->type == KDBUS_ITEM_ID_ADD ? owner : NULL); | |
964 | } | |
49b832c5 | 965 | |
cb67f718 DM |
966 | static int translate_reply(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { |
967 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; | |
968 | int r; | |
777d7a61 | 969 | |
cb67f718 DM |
970 | assert(bus); |
971 | assert(k); | |
972 | assert(d); | |
acb5a3cb | 973 | |
cb67f718 DM |
974 | r = bus_message_new_synthetic_error( |
975 | bus, | |
976 | k->cookie_reply, | |
977 | d->type == KDBUS_ITEM_REPLY_TIMEOUT ? | |
978 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") : | |
979 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"), | |
980 | &m); | |
1307c3ff | 981 | if (r < 0) |
cb67f718 | 982 | return r; |
51038c03 | 983 | |
cb67f718 | 984 | m->sender = "org.freedesktop.DBus"; |
51038c03 | 985 | |
cb67f718 DM |
986 | r = bus_seal_synthetic_message(bus, m); |
987 | if (r < 0) | |
988 | return r; | |
6629161f | 989 | |
7adc46fc | 990 | bus->rqueue[bus->rqueue_size++] = m; |
cb67f718 | 991 | m = NULL; |
7d22c717 | 992 | |
6629161f | 993 | return 1; |
cb67f718 | 994 | } |
1307c3ff | 995 | |
cb67f718 DM |
996 | static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) { |
997 | struct kdbus_item *d, *found = NULL; | |
1307c3ff | 998 | |
cb67f718 DM |
999 | static int (* const translate[])(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) = { |
1000 | [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1001 | [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1002 | [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1307c3ff | 1003 | |
cb67f718 DM |
1004 | [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, |
1005 | [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, | |
1006 | ||
1007 | [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1008 | [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1009 | }; | |
1010 | ||
1011 | assert(bus); | |
1012 | assert(k); | |
1013 | assert(k->payload_type == KDBUS_PAYLOAD_KERNEL); | |
1014 | ||
1015 | KDBUS_ITEM_FOREACH(d, k, items) { | |
1016 | if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) { | |
1017 | if (found) | |
1018 | return -EBADMSG; | |
1019 | found = d; | |
1020 | } else | |
1021 | log_debug("Got unknown field from kernel %llu", d->type); | |
1307c3ff LP |
1022 | } |
1023 | ||
cb67f718 DM |
1024 | if (!found) { |
1025 | log_debug("Didn't find a kernel message to translate."); | |
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found); | |
6629161f LP |
1030 | } |
1031 | ||
7d22c717 | 1032 | int bus_kernel_read_message(sd_bus *bus) { |
9ff1897b | 1033 | struct kdbus_cmd_recv recv = {}; |
6629161f | 1034 | struct kdbus_msg *k; |
6629161f LP |
1035 | int r; |
1036 | ||
1037 | assert(bus); | |
7d22c717 | 1038 | |
7adc46fc | 1039 | r = bus_rqueue_make_room(bus); |
7d22c717 LP |
1040 | if (r < 0) |
1041 | return r; | |
6629161f | 1042 | |
9ff1897b | 1043 | r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &recv); |
fd8d62d9 | 1044 | if (r < 0) { |
6629161f LP |
1045 | if (errno == EAGAIN) |
1046 | return 0; | |
1047 | ||
fd8d62d9 | 1048 | return -errno; |
6629161f LP |
1049 | } |
1050 | ||
069f5e61 | 1051 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.offset); |
e1d337d4 | 1052 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
7d22c717 | 1053 | r = bus_kernel_make_message(bus, k); |
e1d337d4 LP |
1054 | |
1055 | /* Anybody can send us invalid messages, let's just drop them. */ | |
1056 | if (r == -EBADMSG || r == -EPROTOTYPE) { | |
ff4994c5 | 1057 | log_debug("Ignoring invalid message: %s", strerror(-r)); |
e1d337d4 LP |
1058 | r = 0; |
1059 | } | |
1060 | ||
1061 | } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) | |
7d22c717 | 1062 | r = bus_kernel_translate_message(bus, k); |
069f5e61 LP |
1063 | else { |
1064 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
777d7a61 | 1065 | r = 0; |
069f5e61 | 1066 | } |
777d7a61 | 1067 | |
fd8d62d9 LP |
1068 | if (r <= 0) |
1069 | close_kdbus_msg(bus, k); | |
6629161f | 1070 | |
51038c03 | 1071 | return r < 0 ? r : 1; |
6629161f LP |
1072 | } |
1073 | ||
8e959fbf | 1074 | int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) { |
bc7fd8cd | 1075 | struct memfd_cache *c; |
45fbe937 | 1076 | int fd; |
bc7fd8cd LP |
1077 | |
1078 | assert(address); | |
8e959fbf LP |
1079 | assert(mapped); |
1080 | assert(allocated); | |
35460afc LP |
1081 | |
1082 | if (!bus || !bus->is_kernel) | |
1083 | return -ENOTSUP; | |
bc7fd8cd | 1084 | |
76b7742c | 1085 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
45fbe937 | 1086 | |
bc7fd8cd | 1087 | if (bus->n_memfd_cache <= 0) { |
8d1db1d1 LP |
1088 | _cleanup_free_ char *g = NULL; |
1089 | struct kdbus_cmd_memfd_make *cmd; | |
1090 | struct kdbus_item *item; | |
1091 | size_t l, sz; | |
45fbe937 LP |
1092 | int r; |
1093 | ||
76b7742c | 1094 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1095 | |
8d1db1d1 LP |
1096 | assert(bus->connection_name); |
1097 | ||
1098 | g = sd_bus_label_escape(bus->connection_name); | |
1099 | if (!g) | |
1100 | return -ENOMEM; | |
1101 | ||
1102 | l = strlen(g); | |
1103 | sz = ALIGN8(offsetof(struct kdbus_cmd_memfd_make, items)) + | |
1104 | ALIGN8(offsetof(struct kdbus_item, str)) + | |
1105 | l + 1; | |
1106 | cmd = alloca0(sz); | |
1107 | cmd->size = sz; | |
1108 | ||
1109 | item = cmd->items; | |
1110 | item->size = ALIGN8(offsetof(struct kdbus_item, str)) + l + 1; | |
1111 | item->type = KDBUS_ITEM_MEMFD_NAME; | |
1112 | memcpy(item->str, g, l + 1); | |
1113 | ||
1114 | r = ioctl(bus->input_fd, KDBUS_CMD_MEMFD_NEW, cmd); | |
9b05bc48 | 1115 | if (r < 0) |
bc7fd8cd LP |
1116 | return -errno; |
1117 | ||
1118 | *address = NULL; | |
8e959fbf LP |
1119 | *mapped = 0; |
1120 | *allocated = 0; | |
8d1db1d1 | 1121 | return cmd->fd; |
bc7fd8cd LP |
1122 | } |
1123 | ||
bf30e48f | 1124 | c = &bus->memfd_cache[--bus->n_memfd_cache]; |
bc7fd8cd LP |
1125 | |
1126 | assert(c->fd >= 0); | |
8e959fbf | 1127 | assert(c->mapped == 0 || c->address); |
bc7fd8cd LP |
1128 | |
1129 | *address = c->address; | |
8e959fbf LP |
1130 | *mapped = c->mapped; |
1131 | *allocated = c->allocated; | |
45fbe937 LP |
1132 | fd = c->fd; |
1133 | ||
76b7742c | 1134 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1135 | |
45fbe937 LP |
1136 | return fd; |
1137 | } | |
1138 | ||
1139 | static void close_and_munmap(int fd, void *address, size_t size) { | |
1140 | if (size > 0) | |
76b7742c | 1141 | assert_se(munmap(address, PAGE_ALIGN(size)) >= 0); |
45fbe937 LP |
1142 | |
1143 | close_nointr_nofail(fd); | |
bc7fd8cd LP |
1144 | } |
1145 | ||
8e959fbf | 1146 | void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) { |
bc7fd8cd | 1147 | struct memfd_cache *c; |
8e959fbf | 1148 | uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX); |
bc7fd8cd LP |
1149 | |
1150 | assert(fd >= 0); | |
8e959fbf | 1151 | assert(mapped == 0 || address); |
bc7fd8cd | 1152 | |
45fbe937 | 1153 | if (!bus || !bus->is_kernel) { |
8e959fbf | 1154 | close_and_munmap(fd, address, mapped); |
45fbe937 LP |
1155 | return; |
1156 | } | |
1157 | ||
76b7742c | 1158 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1159 | |
45fbe937 | 1160 | if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) { |
76b7742c | 1161 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1162 | |
8e959fbf | 1163 | close_and_munmap(fd, address, mapped); |
bc7fd8cd LP |
1164 | return; |
1165 | } | |
1166 | ||
1167 | c = &bus->memfd_cache[bus->n_memfd_cache++]; | |
1168 | c->fd = fd; | |
1169 | c->address = address; | |
1170 | ||
1171 | /* If overly long, let's return a bit to the OS */ | |
8e959fbf LP |
1172 | if (mapped > max_mapped) { |
1173 | assert_se(ioctl(fd, KDBUS_CMD_MEMFD_SIZE_SET, &max_mapped) >= 0); | |
1174 | assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0); | |
1175 | c->mapped = c->allocated = max_mapped; | |
1176 | } else { | |
1177 | c->mapped = mapped; | |
1178 | c->allocated = allocated; | |
1179 | } | |
45fbe937 | 1180 | |
76b7742c | 1181 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd LP |
1182 | } |
1183 | ||
1184 | void bus_kernel_flush_memfd(sd_bus *b) { | |
1185 | unsigned i; | |
1186 | ||
1187 | assert(b); | |
1188 | ||
76b7742c | 1189 | for (i = 0; i < b->n_memfd_cache; i++) |
8e959fbf | 1190 | close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped); |
bc7fd8cd | 1191 | } |
0253ddcc | 1192 | |
e3dd987c LP |
1193 | int kdbus_translate_request_name_flags(uint64_t flags, uint64_t *kdbus_flags) { |
1194 | uint64_t f = 0; | |
0253ddcc | 1195 | |
e3dd987c | 1196 | assert(kdbus_flags); |
0253ddcc | 1197 | |
e3dd987c LP |
1198 | if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT) |
1199 | f |= KDBUS_NAME_ALLOW_REPLACEMENT; | |
0253ddcc | 1200 | |
e3dd987c LP |
1201 | if (flags & SD_BUS_NAME_REPLACE_EXISTING) |
1202 | f |= KDBUS_NAME_REPLACE_EXISTING; | |
0253ddcc | 1203 | |
d90bb669 | 1204 | if (flags & SD_BUS_NAME_QUEUE) |
e3dd987c | 1205 | f |= KDBUS_NAME_QUEUE; |
0253ddcc | 1206 | |
e3dd987c LP |
1207 | *kdbus_flags = f; |
1208 | return 0; | |
1209 | } | |
1210 | ||
1211 | int kdbus_translate_attach_flags(uint64_t mask, uint64_t *kdbus_mask) { | |
1212 | uint64_t m = 0; | |
1213 | ||
1214 | assert(kdbus_mask); | |
1215 | ||
1216 | if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID)) | |
1217 | m |= KDBUS_ATTACH_CREDS; | |
1218 | ||
1219 | if (mask & (SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM)) | |
1220 | m |= KDBUS_ATTACH_COMM; | |
1221 | ||
1222 | if (mask & SD_BUS_CREDS_EXE) | |
1223 | m |= KDBUS_ATTACH_EXE; | |
1224 | ||
1225 | if (mask & SD_BUS_CREDS_CMDLINE) | |
1226 | m |= KDBUS_ATTACH_CMDLINE; | |
1227 | ||
1228 | if (mask & (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID)) | |
1229 | m |= KDBUS_ATTACH_CGROUP; | |
1230 | ||
1231 | if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) | |
1232 | m |= KDBUS_ATTACH_CAPS; | |
1233 | ||
1234 | if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) | |
1235 | m |= KDBUS_ATTACH_SECLABEL; | |
0253ddcc | 1236 | |
e3dd987c LP |
1237 | if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) |
1238 | m |= KDBUS_ATTACH_AUDIT; | |
1239 | ||
49b832c5 LP |
1240 | if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) |
1241 | m |= KDBUS_ATTACH_NAMES; | |
1242 | ||
e3dd987c | 1243 | *kdbus_mask = m; |
0253ddcc DM |
1244 | return 0; |
1245 | } | |
e3dd987c | 1246 | |
f2769777 | 1247 | int bus_kernel_create_bus(const char *name, bool world, char **s) { |
816a3f9e | 1248 | struct kdbus_cmd_make *make; |
e3dd987c LP |
1249 | struct kdbus_item *n; |
1250 | int fd; | |
1251 | ||
1252 | assert(name); | |
1253 | assert(s); | |
1254 | ||
1255 | fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1256 | if (fd < 0) | |
1257 | return -errno; | |
1258 | ||
816a3f9e DM |
1259 | make = alloca0(ALIGN8(offsetof(struct kdbus_cmd_make, items) + |
1260 | offsetof(struct kdbus_item, data64) + sizeof(uint64_t) + | |
e3dd987c LP |
1261 | offsetof(struct kdbus_item, str) + |
1262 | DECIMAL_STR_MAX(uid_t) + 1 + strlen(name) + 1)); | |
1263 | ||
816a3f9e DM |
1264 | make->size = offsetof(struct kdbus_cmd_make, items); |
1265 | ||
e3dd987c | 1266 | n = make->items; |
816a3f9e DM |
1267 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); |
1268 | n->type = KDBUS_ITEM_BLOOM_SIZE; | |
1269 | n->data64[0] = BLOOM_SIZE; | |
1270 | assert_cc(BLOOM_SIZE % 8 == 0); | |
1271 | make->size += ALIGN8(n->size); | |
1272 | ||
1273 | n = KDBUS_ITEM_NEXT(n); | |
e3dd987c LP |
1274 | sprintf(n->str, "%lu-%s", (unsigned long) getuid(), name); |
1275 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
5e16c257 | 1276 | n->type = KDBUS_ITEM_MAKE_NAME; |
816a3f9e | 1277 | make->size += ALIGN8(n->size); |
e3dd987c | 1278 | |
f2769777 | 1279 | make->flags = KDBUS_MAKE_POLICY_OPEN | (world ? KDBUS_MAKE_ACCESS_WORLD : 0); |
e3dd987c LP |
1280 | |
1281 | if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { | |
1282 | close_nointr_nofail(fd); | |
1283 | return -errno; | |
1284 | } | |
1285 | ||
f9638db8 LP |
1286 | /* The higher 32bit of the flags field are considered |
1287 | * 'incompatible flags'. Refuse them all for now. */ | |
1288 | if (make->flags > 0xFFFFFFFFULL) { | |
1289 | close_nointr_nofail(fd); | |
1290 | return -ENOTSUP; | |
1291 | } | |
1292 | ||
e3dd987c LP |
1293 | if (s) { |
1294 | char *p; | |
1295 | ||
1296 | p = strjoin("/dev/kdbus/", n->str, "/bus", NULL); | |
1297 | if (!p) { | |
1298 | close_nointr_nofail(fd); | |
1299 | return -ENOMEM; | |
1300 | } | |
1301 | ||
1302 | *s = p; | |
1303 | } | |
1304 | ||
1305 | return fd; | |
1306 | } | |
9bd37b40 | 1307 | |
e821075a LP |
1308 | int bus_kernel_create_starter(const char *bus, const char *name) { |
1309 | struct kdbus_cmd_hello *hello; | |
1310 | struct kdbus_item *n; | |
1311 | char *p; | |
1312 | int fd; | |
1313 | ||
1314 | assert(bus); | |
1315 | assert(name); | |
1316 | ||
1317 | p = alloca(sizeof("/dev/kdbus/") - 1 + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + sizeof("/bus")); | |
1318 | sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus); | |
1319 | ||
1320 | fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1321 | if (fd < 0) | |
1322 | return -errno; | |
1323 | ||
1324 | hello = alloca0(ALIGN8(offsetof(struct kdbus_cmd_hello, items) + | |
1325 | offsetof(struct kdbus_item, str) + | |
1326 | strlen(name) + 1)); | |
1327 | ||
1328 | n = hello->items; | |
1329 | strcpy(n->str, name); | |
1330 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
613ec4b8 | 1331 | n->type = KDBUS_ITEM_NAME; |
e821075a LP |
1332 | |
1333 | hello->size = ALIGN8(offsetof(struct kdbus_cmd_hello, items) + n->size); | |
07442eff | 1334 | hello->conn_flags = KDBUS_HELLO_ACTIVATOR; |
e821075a LP |
1335 | hello->pool_size = KDBUS_POOL_SIZE; |
1336 | ||
1337 | if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) { | |
1338 | close_nointr_nofail(fd); | |
1339 | return -errno; | |
1340 | } | |
1341 | ||
1342 | /* The higher 32bit of both flags fields are considered | |
1343 | * 'incompatible flags'. Refuse them all for now. */ | |
1344 | if (hello->bus_flags > 0xFFFFFFFFULL || | |
1345 | hello->conn_flags > 0xFFFFFFFFULL) { | |
1346 | close_nointr_nofail(fd); | |
1347 | return -ENOTSUP; | |
1348 | } | |
1349 | ||
1350 | if (hello->bloom_size != BLOOM_SIZE) { | |
1351 | close_nointr_nofail(fd); | |
1352 | return -ENOTSUP; | |
1353 | } | |
1354 | ||
1355 | return fd; | |
1356 | } | |
1357 | ||
9bd37b40 | 1358 | int bus_kernel_create_namespace(const char *name, char **s) { |
816a3f9e | 1359 | struct kdbus_cmd_make *make; |
9bd37b40 LP |
1360 | struct kdbus_item *n; |
1361 | int fd; | |
1362 | ||
1363 | assert(name); | |
1364 | assert(s); | |
1365 | ||
1366 | fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1367 | if (fd < 0) | |
1368 | return -errno; | |
1369 | ||
816a3f9e | 1370 | make = alloca0(ALIGN8(offsetof(struct kdbus_cmd_make, items) + |
9bd37b40 LP |
1371 | offsetof(struct kdbus_item, str) + |
1372 | strlen(name) + 1)); | |
1373 | ||
1374 | n = make->items; | |
1375 | strcpy(n->str, name); | |
1376 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
5e16c257 | 1377 | n->type = KDBUS_ITEM_MAKE_NAME; |
9bd37b40 | 1378 | |
816a3f9e | 1379 | make->size = ALIGN8(offsetof(struct kdbus_cmd_make, items) + n->size); |
fd5b0b91 | 1380 | make->flags = KDBUS_MAKE_POLICY_OPEN | KDBUS_MAKE_ACCESS_WORLD; |
9bd37b40 LP |
1381 | |
1382 | if (ioctl(fd, KDBUS_CMD_NS_MAKE, make) < 0) { | |
1383 | close_nointr_nofail(fd); | |
1384 | return -errno; | |
1385 | } | |
1386 | ||
f9638db8 LP |
1387 | /* The higher 32bit of the flags field are considered |
1388 | * 'incompatible flags'. Refuse them all for now. */ | |
1389 | if (make->flags > 0xFFFFFFFFULL) { | |
1390 | close_nointr_nofail(fd); | |
1391 | return -ENOTSUP; | |
1392 | } | |
1393 | ||
9bd37b40 LP |
1394 | if (s) { |
1395 | char *p; | |
1396 | ||
f8a2d1c9 | 1397 | p = strappend("/dev/kdbus/ns/", name); |
9bd37b40 LP |
1398 | if (!p) { |
1399 | close_nointr_nofail(fd); | |
1400 | return -ENOMEM; | |
1401 | } | |
1402 | ||
1403 | *s = p; | |
1404 | } | |
1405 | ||
1406 | return fd; | |
1407 | } | |
c8fa3f60 | 1408 | |
b6c631f3 KS |
1409 | int bus_kernel_create_monitor(const char *bus) { |
1410 | struct kdbus_cmd_hello *hello; | |
1411 | char *p; | |
1412 | int fd; | |
c8fa3f60 LS |
1413 | |
1414 | assert(bus); | |
1415 | ||
b6c631f3 KS |
1416 | p = alloca(sizeof("/dev/kdbus/") - 1 + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + sizeof("/bus")); |
1417 | sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus); | |
c8fa3f60 | 1418 | |
b6c631f3 KS |
1419 | fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); |
1420 | if (fd < 0) | |
c8fa3f60 LS |
1421 | return -errno; |
1422 | ||
b6c631f3 KS |
1423 | hello = alloca0(sizeof(struct kdbus_cmd_hello)); |
1424 | hello->size = sizeof(struct kdbus_cmd_hello); | |
1425 | hello->conn_flags = KDBUS_HELLO_ACTIVATOR; | |
1426 | hello->pool_size = KDBUS_POOL_SIZE; | |
1427 | ||
1428 | if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) { | |
1429 | close_nointr_nofail(fd); | |
1430 | return -errno; | |
1431 | } | |
1432 | ||
1433 | /* The higher 32bit of both flags fields are considered | |
1434 | * 'incompatible flags'. Refuse them all for now. */ | |
1435 | if (hello->bus_flags > 0xFFFFFFFFULL || | |
1436 | hello->conn_flags > 0xFFFFFFFFULL) { | |
1437 | close_nointr_nofail(fd); | |
1438 | return -ENOTSUP; | |
1439 | } | |
1440 | ||
1441 | return fd; | |
c8fa3f60 | 1442 | } |
ae095f86 LP |
1443 | |
1444 | int bus_kernel_try_close(sd_bus *bus) { | |
1445 | assert(bus); | |
1446 | assert(bus->is_kernel); | |
1447 | ||
1448 | if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE) < 0) | |
1449 | return -errno; | |
1450 | ||
1451 | return 0; | |
1452 | } |