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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> |
6629161f LP |
29 | |
30 | #include "util.h" | |
65dae17a | 31 | #include "strv.h" |
6629161f LP |
32 | |
33 | #include "bus-internal.h" | |
34 | #include "bus-message.h" | |
35 | #include "bus-kernel.h" | |
a56f19c4 | 36 | #include "bus-bloom.h" |
777d7a61 | 37 | #include "bus-util.h" |
751bc6ac | 38 | #include "cgroup-util.h" |
777d7a61 LP |
39 | |
40 | #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t)) | |
6629161f | 41 | |
c7819669 | 42 | int bus_kernel_parse_unique_name(const char *s, uint64_t *id) { |
6629161f LP |
43 | int r; |
44 | ||
45 | assert(s); | |
46 | assert(id); | |
47 | ||
48 | if (!startswith(s, ":1.")) | |
49 | return 0; | |
50 | ||
51 | r = safe_atou64(s + 3, id); | |
52 | if (r < 0) | |
53 | return r; | |
54 | ||
55 | return 1; | |
56 | } | |
57 | ||
febfd508 | 58 | static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) { |
6629161f | 59 | assert(d); |
6629161f LP |
60 | assert(sz > 0); |
61 | ||
e86b80b8 LP |
62 | *d = ALIGN8_PTR(*d); |
63 | ||
66b26c5c LP |
64 | /* Note that p can be NULL, which encodes a region full of |
65 | * zeroes, which is useful to optimize certain padding | |
66 | * conditions */ | |
67 | ||
febfd508 | 68 | (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec); |
ea1edece | 69 | (*d)->type = KDBUS_ITEM_PAYLOAD_VEC; |
a392d361 | 70 | (*d)->vec.address = PTR_TO_UINT64(p); |
6629161f LP |
71 | (*d)->vec.size = sz; |
72 | ||
febfd508 | 73 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
74 | } |
75 | ||
a392d361 LP |
76 | static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t sz) { |
77 | assert(d); | |
78 | assert(memfd >= 0); | |
79 | assert(sz > 0); | |
80 | ||
81 | *d = ALIGN8_PTR(*d); | |
82 | (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd); | |
ea1edece | 83 | (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD; |
a392d361 LP |
84 | (*d)->memfd.fd = memfd; |
85 | (*d)->memfd.size = sz; | |
86 | ||
87 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); | |
88 | } | |
89 | ||
febfd508 | 90 | static void append_destination(struct kdbus_item **d, const char *s, size_t length) { |
6629161f | 91 | assert(d); |
b5baa8fe | 92 | assert(s); |
6629161f | 93 | |
e86b80b8 LP |
94 | *d = ALIGN8_PTR(*d); |
95 | ||
febfd508 | 96 | (*d)->size = offsetof(struct kdbus_item, str) + length + 1; |
ea1edece | 97 | (*d)->type = KDBUS_ITEM_DST_NAME; |
51038c03 | 98 | memcpy((*d)->str, s, length + 1); |
6629161f | 99 | |
febfd508 | 100 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
101 | } |
102 | ||
febfd508 | 103 | static void* append_bloom(struct kdbus_item **d, size_t length) { |
a56f19c4 LP |
104 | void *r; |
105 | ||
b5baa8fe | 106 | assert(d); |
b5baa8fe LP |
107 | |
108 | *d = ALIGN8_PTR(*d); | |
109 | ||
febfd508 | 110 | (*d)->size = offsetof(struct kdbus_item, data) + length; |
ea1edece | 111 | (*d)->type = KDBUS_ITEM_BLOOM; |
a56f19c4 | 112 | r = (*d)->data; |
b5baa8fe | 113 | |
febfd508 | 114 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
a56f19c4 LP |
115 | |
116 | return r; | |
117 | } | |
118 | ||
febfd508 | 119 | static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) { |
9097fe29 LP |
120 | assert(d); |
121 | assert(fds); | |
122 | assert(n_fds > 0); | |
123 | ||
124 | *d = ALIGN8_PTR(*d); | |
febfd508 | 125 | (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds; |
ea1edece | 126 | (*d)->type = KDBUS_ITEM_FDS; |
9097fe29 LP |
127 | memcpy((*d)->fds, fds, sizeof(int) * n_fds); |
128 | ||
febfd508 | 129 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
9097fe29 LP |
130 | } |
131 | ||
a56f19c4 LP |
132 | static int bus_message_setup_bloom(sd_bus_message *m, void *bloom) { |
133 | unsigned i; | |
134 | int r; | |
135 | ||
136 | assert(m); | |
137 | assert(bloom); | |
138 | ||
139 | memset(bloom, 0, BLOOM_SIZE); | |
140 | ||
141 | bloom_add_pair(bloom, "message-type", bus_message_type_to_string(m->header->type)); | |
142 | ||
143 | if (m->interface) | |
144 | bloom_add_pair(bloom, "interface", m->interface); | |
145 | if (m->member) | |
146 | bloom_add_pair(bloom, "member", m->member); | |
147 | if (m->path) { | |
148 | bloom_add_pair(bloom, "path", m->path); | |
f11e11e3 | 149 | bloom_add_pair(bloom, "path-slash-prefix", m->path); |
a56f19c4 LP |
150 | bloom_add_prefixes(bloom, "path-slash-prefix", m->path, '/'); |
151 | } | |
152 | ||
153 | r = sd_bus_message_rewind(m, true); | |
154 | if (r < 0) | |
155 | return r; | |
156 | ||
157 | for (i = 0; i < 64; i++) { | |
158 | char type; | |
159 | const char *t; | |
160 | char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")]; | |
161 | char *e; | |
162 | ||
163 | r = sd_bus_message_peek_type(m, &type, NULL); | |
164 | if (r < 0) | |
165 | return r; | |
166 | ||
167 | if (type != SD_BUS_TYPE_STRING && | |
168 | type != SD_BUS_TYPE_OBJECT_PATH && | |
169 | type != SD_BUS_TYPE_SIGNATURE) | |
170 | break; | |
171 | ||
172 | r = sd_bus_message_read_basic(m, type, &t); | |
173 | if (r < 0) | |
174 | return r; | |
175 | ||
176 | e = stpcpy(buf, "arg"); | |
177 | if (i < 10) | |
693eb9a2 | 178 | *(e++) = '0' + (char) i; |
a56f19c4 | 179 | else { |
693eb9a2 LP |
180 | *(e++) = '0' + (char) (i / 10); |
181 | *(e++) = '0' + (char) (i % 10); | |
a56f19c4 LP |
182 | } |
183 | ||
184 | *e = 0; | |
185 | bloom_add_pair(bloom, buf, t); | |
186 | ||
187 | strcpy(e, "-dot-prefix"); | |
188 | bloom_add_prefixes(bloom, buf, t, '.'); | |
189 | strcpy(e, "-slash-prefix"); | |
190 | bloom_add_prefixes(bloom, buf, t, '/'); | |
191 | } | |
192 | ||
193 | return 0; | |
b5baa8fe LP |
194 | } |
195 | ||
5b7d4c1c | 196 | static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { |
9b29bb68 | 197 | struct bus_body_part *part; |
febfd508 | 198 | struct kdbus_item *d; |
6629161f LP |
199 | bool well_known; |
200 | uint64_t unique; | |
201 | size_t sz, dl; | |
9b29bb68 | 202 | unsigned i; |
6629161f LP |
203 | int r; |
204 | ||
5b7d4c1c | 205 | assert(b); |
6629161f LP |
206 | assert(m); |
207 | assert(m->sealed); | |
e9a967f9 | 208 | |
069f5e61 LP |
209 | /* We put this together only once, if this message is reused |
210 | * we reuse the earlier-built version */ | |
e9a967f9 LP |
211 | if (m->kdbus) |
212 | return 0; | |
6629161f LP |
213 | |
214 | if (m->destination) { | |
c7819669 | 215 | r = bus_kernel_parse_unique_name(m->destination, &unique); |
6629161f LP |
216 | if (r < 0) |
217 | return r; | |
218 | ||
219 | well_known = r == 0; | |
220 | } else | |
221 | well_known = false; | |
222 | ||
b1454bf0 | 223 | sz = offsetof(struct kdbus_msg, items); |
6629161f | 224 | |
a392d361 LP |
225 | assert_cc(ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)) == |
226 | ALIGN8(offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd))); | |
227 | ||
69aec65c | 228 | /* Add in fixed header, fields header and payload */ |
c91cb83c | 229 | sz += (1 + m->n_body_parts) * |
bc7fd8cd | 230 | ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)); |
6629161f | 231 | |
69aec65c | 232 | /* Add space for bloom filter */ |
febfd508 | 233 | sz += ALIGN8(offsetof(struct kdbus_item, data) + BLOOM_SIZE); |
b5baa8fe | 234 | |
6629161f LP |
235 | /* Add in well-known destination header */ |
236 | if (well_known) { | |
237 | dl = strlen(m->destination); | |
febfd508 | 238 | sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1); |
6629161f LP |
239 | } |
240 | ||
9097fe29 LP |
241 | /* Add space for unix fds */ |
242 | if (m->n_fds > 0) | |
febfd508 | 243 | sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds); |
9097fe29 | 244 | |
c556fe79 | 245 | m->kdbus = memalign(8, sz); |
66b26c5c LP |
246 | if (!m->kdbus) { |
247 | r = -ENOMEM; | |
248 | goto fail; | |
249 | } | |
6629161f | 250 | |
66b26c5c | 251 | m->free_kdbus = true; |
d9115e18 LP |
252 | memset(m->kdbus, 0, sz); |
253 | ||
6629161f | 254 | m->kdbus->flags = |
0461f8cd | 255 | ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) | |
97f82db3 | 256 | ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0); |
6629161f LP |
257 | m->kdbus->dst_id = |
258 | well_known ? 0 : | |
b5baa8fe | 259 | m->destination ? unique : KDBUS_DST_ID_BROADCAST; |
6647dc66 | 260 | m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; |
6629161f | 261 | m->kdbus->cookie = m->header->serial; |
80a33f11 KS |
262 | |
263 | if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) | |
693eb9a2 | 264 | m->kdbus->cookie_reply = m->reply_cookie; |
80a33f11 KS |
265 | else |
266 | m->kdbus->timeout_ns = m->timeout * NSEC_PER_USEC; | |
6629161f | 267 | |
b1454bf0 | 268 | d = m->kdbus->items; |
6629161f LP |
269 | |
270 | if (well_known) | |
271 | append_destination(&d, m->destination, dl); | |
272 | ||
c91cb83c | 273 | append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
a392d361 LP |
274 | |
275 | MESSAGE_FOREACH_PART(part, i, m) { | |
276 | if (part->is_zero) { | |
66b26c5c LP |
277 | /* If this is padding then simply send a |
278 | * vector with a NULL data pointer which the | |
279 | * kernel will just pass through. This is the | |
280 | * most efficient way to encode zeroes */ | |
281 | ||
a392d361 LP |
282 | append_payload_vec(&d, NULL, part->size); |
283 | continue; | |
284 | } | |
285 | ||
66b26c5c LP |
286 | if (part->memfd >= 0 && part->sealed && m->destination) { |
287 | /* Try to send a memfd, if the part is | |
288 | * sealed and this is not a broadcast. Since we can only */ | |
a392d361 | 289 | |
66b26c5c LP |
290 | append_payload_memfd(&d, part->memfd, part->size); |
291 | continue; | |
a392d361 LP |
292 | } |
293 | ||
66b26c5c LP |
294 | /* Otherwise let's send a vector to the actual data, |
295 | * for that we need to map it first. */ | |
296 | r = bus_body_part_map(part); | |
297 | if (r < 0) | |
298 | goto fail; | |
a392d361 | 299 | |
bc7fd8cd | 300 | append_payload_vec(&d, part->data, part->size); |
a392d361 | 301 | } |
6629161f | 302 | |
5b7d4c1c LP |
303 | if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) { |
304 | void *p; | |
305 | ||
a56f19c4 LP |
306 | p = append_bloom(&d, BLOOM_SIZE); |
307 | r = bus_message_setup_bloom(m, p); | |
a392d361 LP |
308 | if (r < 0) |
309 | goto fail; | |
5b7d4c1c | 310 | } |
b5baa8fe | 311 | |
9097fe29 LP |
312 | if (m->n_fds > 0) |
313 | append_fds(&d, m->fds, m->n_fds); | |
314 | ||
e9a967f9 | 315 | m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus; |
6629161f LP |
316 | assert(m->kdbus->size <= sz); |
317 | ||
318 | return 0; | |
a392d361 LP |
319 | |
320 | fail: | |
66b26c5c | 321 | m->poisoned = true; |
a392d361 | 322 | return r; |
6629161f LP |
323 | } |
324 | ||
cb67f718 DM |
325 | static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { |
326 | sd_bus_message *m = NULL; | |
327 | struct kdbus_item *d; | |
328 | unsigned n_fds = 0; | |
329 | _cleanup_free_ int *fds = NULL; | |
330 | struct bus_header *h = NULL; | |
331 | size_t total, n_bytes = 0, idx = 0; | |
332 | const char *destination = NULL, *seclabel = NULL; | |
6629161f LP |
333 | int r; |
334 | ||
cb67f718 DM |
335 | assert(bus); |
336 | assert(k); | |
337 | assert(k->payload_type == KDBUS_PAYLOAD_DBUS); | |
35460afc | 338 | |
cb67f718 DM |
339 | KDBUS_ITEM_FOREACH(d, k, items) { |
340 | size_t l; | |
f08838da | 341 | |
cb67f718 | 342 | l = d->size - offsetof(struct kdbus_item, data); |
8f155917 | 343 | |
cb67f718 | 344 | switch (d->type) { |
62b3e928 | 345 | |
cb67f718 DM |
346 | case KDBUS_ITEM_PAYLOAD_OFF: |
347 | if (!h) { | |
348 | h = (struct bus_header *)((uint8_t *)k + d->vec.offset); | |
8a0e0ed9 | 349 | |
cb67f718 DM |
350 | if (!bus_header_is_complete(h, d->vec.size)) |
351 | return -EBADMSG; | |
352 | } | |
8a0e0ed9 | 353 | |
cb67f718 DM |
354 | n_bytes += d->vec.size; |
355 | break; | |
8a0e0ed9 | 356 | |
cb67f718 DM |
357 | case KDBUS_ITEM_PAYLOAD_MEMFD: |
358 | if (!h) | |
359 | return -EBADMSG; | |
8a0e0ed9 | 360 | |
cb67f718 DM |
361 | n_bytes += d->memfd.size; |
362 | break; | |
8a0e0ed9 | 363 | |
cb67f718 DM |
364 | case KDBUS_ITEM_FDS: { |
365 | int *f; | |
366 | unsigned j; | |
8a0e0ed9 | 367 | |
cb67f718 DM |
368 | j = l / sizeof(int); |
369 | f = realloc(fds, sizeof(int) * (n_fds + j)); | |
370 | if (!f) | |
371 | return -ENOMEM; | |
8a0e0ed9 | 372 | |
cb67f718 DM |
373 | fds = f; |
374 | memcpy(fds + n_fds, d->fds, sizeof(int) * j); | |
375 | n_fds += j; | |
376 | break; | |
377 | } | |
62b3e928 | 378 | |
cb67f718 DM |
379 | case KDBUS_ITEM_SECLABEL: |
380 | seclabel = d->str; | |
381 | break; | |
fd8d62d9 LP |
382 | } |
383 | } | |
384 | ||
cb67f718 DM |
385 | if (!h) |
386 | return -EBADMSG; | |
de297575 | 387 | |
cb67f718 DM |
388 | r = bus_header_message_size(h, &total); |
389 | if (r < 0) | |
390 | return r; | |
219728b3 | 391 | |
cb67f718 DM |
392 | if (n_bytes != total) |
393 | return -EBADMSG; | |
6629161f | 394 | |
cb67f718 DM |
395 | /* on kdbus we only speak native endian gvariant, never dbus1 |
396 | * marshalling or reverse endian */ | |
397 | if (h->version != 2 || | |
398 | h->endian != BUS_NATIVE_ENDIAN) | |
399 | return -EPROTOTYPE; | |
c58dea19 | 400 | |
cb67f718 DM |
401 | r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m); |
402 | if (r < 0) | |
403 | return r; | |
6629161f | 404 | |
cb67f718 DM |
405 | /* The well-known names list is different from the other |
406 | credentials. If we asked for it, but nothing is there, this | |
407 | means that the list of well-known names is simply empty, not | |
408 | that we lack any data */ | |
35460afc | 409 | |
cb67f718 | 410 | m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask; |
f08838da | 411 | |
cb67f718 DM |
412 | KDBUS_ITEM_FOREACH(d, k, items) { |
413 | size_t l; | |
6629161f | 414 | |
cb67f718 | 415 | l = d->size - offsetof(struct kdbus_item, data); |
6629161f | 416 | |
cb67f718 | 417 | switch (d->type) { |
6629161f | 418 | |
cb67f718 DM |
419 | case KDBUS_ITEM_PAYLOAD_OFF: { |
420 | size_t begin_body; | |
6629161f | 421 | |
cb67f718 | 422 | begin_body = BUS_MESSAGE_BODY_BEGIN(m); |
6629161f | 423 | |
cb67f718 DM |
424 | if (idx + d->vec.size > begin_body) { |
425 | struct bus_body_part *part; | |
a43b9ca3 | 426 | |
cb67f718 | 427 | /* Contains body material */ |
6629161f | 428 | |
cb67f718 DM |
429 | part = message_append_part(m); |
430 | if (!part) { | |
431 | r = -ENOMEM; | |
432 | goto fail; | |
433 | } | |
a43b9ca3 | 434 | |
cb67f718 DM |
435 | /* A -1 offset is NUL padding. */ |
436 | part->is_zero = d->vec.offset == ~0ULL; | |
a43b9ca3 | 437 | |
cb67f718 DM |
438 | if (idx >= begin_body) { |
439 | if (!part->is_zero) | |
440 | part->data = (uint8_t *)k + d->vec.offset; | |
441 | part->size = d->vec.size; | |
442 | } else { | |
443 | if (!part->is_zero) | |
444 | part->data = (uint8_t *)k + d->vec.offset + (begin_body - idx); | |
445 | part->size = d->vec.size - (begin_body - idx); | |
446 | } | |
a43b9ca3 | 447 | |
cb67f718 | 448 | part->sealed = true; |
ff4994c5 | 449 | } |
a43b9ca3 | 450 | |
cb67f718 DM |
451 | idx += d->vec.size; |
452 | break; | |
453 | } | |
a43b9ca3 | 454 | |
cb67f718 DM |
455 | case KDBUS_ITEM_PAYLOAD_MEMFD: { |
456 | struct bus_body_part *part; | |
a43b9ca3 | 457 | |
cb67f718 DM |
458 | if (idx < BUS_MESSAGE_BODY_BEGIN(m)) { |
459 | r = -EBADMSG; | |
460 | goto fail; | |
ff4994c5 | 461 | } |
a43b9ca3 | 462 | |
cb67f718 DM |
463 | part = message_append_part(m); |
464 | if (!part) { | |
465 | r = -ENOMEM; | |
466 | goto fail; | |
467 | } | |
a43b9ca3 | 468 | |
cb67f718 DM |
469 | part->memfd = d->memfd.fd; |
470 | part->size = d->memfd.size; | |
471 | part->sealed = true; | |
a43b9ca3 | 472 | |
cb67f718 DM |
473 | idx += d->memfd.size; |
474 | break; | |
475 | } | |
a43b9ca3 | 476 | |
cb67f718 DM |
477 | case KDBUS_ITEM_CREDS: |
478 | /* UID/GID/PID are always valid */ | |
479 | m->creds.uid = (uid_t) d->creds.uid; | |
480 | m->creds.gid = (gid_t) d->creds.gid; | |
481 | m->creds.pid = (pid_t) d->creds.pid; | |
482 | m->creds.mask |= (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID) & bus->creds_mask; | |
a43b9ca3 | 483 | |
cb67f718 DM |
484 | /* The PID starttime/TID might be missing |
485 | * however, when the data is faked by some | |
486 | * data bus proxy and it lacks that | |
487 | * information about the real client since | |
488 | * SO_PEERCRED is used for that */ | |
6629161f | 489 | |
cb67f718 DM |
490 | if (d->creds.starttime > 0) { |
491 | m->creds.pid_starttime = d->creds.starttime / NSEC_PER_USEC; | |
492 | m->creds.mask |= SD_BUS_CREDS_PID_STARTTIME & bus->creds_mask; | |
493 | } | |
6629161f | 494 | |
cb67f718 DM |
495 | if (d->creds.tid > 0) { |
496 | m->creds.tid = (pid_t) d->creds.tid; | |
497 | m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask; | |
498 | } | |
499 | break; | |
6629161f | 500 | |
cb67f718 DM |
501 | case KDBUS_ITEM_TIMESTAMP: |
502 | m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC; | |
503 | m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC; | |
6a0e376c | 504 | m->seqnum = d->timestamp.seqnum; |
cb67f718 | 505 | break; |
fd8d62d9 | 506 | |
cb67f718 DM |
507 | case KDBUS_ITEM_PID_COMM: |
508 | m->creds.comm = d->str; | |
509 | m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask; | |
510 | break; | |
fd8d62d9 | 511 | |
cb67f718 DM |
512 | case KDBUS_ITEM_TID_COMM: |
513 | m->creds.tid_comm = d->str; | |
514 | m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask; | |
515 | break; | |
6629161f | 516 | |
cb67f718 DM |
517 | case KDBUS_ITEM_EXE: |
518 | m->creds.exe = d->str; | |
519 | m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask; | |
520 | break; | |
6629161f | 521 | |
cb67f718 DM |
522 | case KDBUS_ITEM_CMDLINE: |
523 | m->creds.cmdline = d->str; | |
524 | m->creds.cmdline_size = l; | |
525 | m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask; | |
526 | break; | |
777d7a61 | 527 | |
cb67f718 DM |
528 | case KDBUS_ITEM_CGROUP: |
529 | m->creds.cgroup = d->str; | |
530 | 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 | 531 | |
cb67f718 DM |
532 | if (!bus->cgroup_root) { |
533 | r = cg_get_root_path(&bus->cgroup_root); | |
534 | if (r < 0) | |
535 | goto fail; | |
536 | } | |
777d7a61 | 537 | |
cb67f718 | 538 | m->creds.cgroup_root = bus->cgroup_root; |
777d7a61 | 539 | |
cb67f718 | 540 | break; |
777d7a61 | 541 | |
cb67f718 DM |
542 | case KDBUS_ITEM_AUDIT: |
543 | m->creds.audit_session_id = (uint32_t) d->audit.sessionid; | |
544 | m->creds.audit_login_uid = (uid_t) d->audit.loginuid; | |
545 | m->creds.mask |= (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID) & bus->creds_mask; | |
546 | break; | |
777d7a61 | 547 | |
cb67f718 DM |
548 | case KDBUS_ITEM_CAPS: |
549 | m->creds.capability = d->data; | |
550 | m->creds.capability_size = l; | |
551 | 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; | |
552 | break; | |
219728b3 | 553 | |
cb67f718 DM |
554 | case KDBUS_ITEM_DST_NAME: |
555 | if (!service_name_is_valid(d->str)) | |
556 | return -EBADMSG; | |
219728b3 | 557 | |
cb67f718 DM |
558 | destination = d->str; |
559 | break; | |
777d7a61 | 560 | |
cb67f718 DM |
561 | case KDBUS_ITEM_NAME: |
562 | if (!service_name_is_valid(d->name.name)) | |
563 | return -EBADMSG; | |
777d7a61 | 564 | |
cb67f718 DM |
565 | r = strv_extend(&m->creds.well_known_names, d->name.name); |
566 | if (r < 0) | |
567 | goto fail; | |
568 | break; | |
777d7a61 | 569 | |
cb67f718 DM |
570 | case KDBUS_ITEM_FDS: |
571 | case KDBUS_ITEM_SECLABEL: | |
572 | break; | |
d78bf250 | 573 | |
cb67f718 DM |
574 | default: |
575 | log_debug("Got unknown field from kernel %llu", d->type); | |
576 | } | |
577 | } | |
d78bf250 | 578 | |
cb67f718 DM |
579 | r = bus_message_parse_fields(m); |
580 | if (r < 0) | |
581 | goto fail; | |
777d7a61 | 582 | |
cb67f718 DM |
583 | /* Override information from the user header with data from the kernel */ |
584 | if (k->src_id == KDBUS_SRC_ID_KERNEL) | |
585 | m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus"; | |
586 | else { | |
587 | snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id); | |
588 | m->sender = m->creds.unique_name = m->sender_buffer; | |
589 | } | |
777d7a61 | 590 | |
cb67f718 DM |
591 | if (destination) |
592 | m->destination = destination; | |
593 | else if (k->dst_id == KDBUS_DST_ID_BROADCAST) | |
594 | m->destination = NULL; | |
595 | else if (k->dst_id == KDBUS_DST_ID_NAME) | |
596 | m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */ | |
597 | else { | |
598 | snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id); | |
599 | m->destination = m->destination_buffer; | |
600 | } | |
777d7a61 | 601 | |
cb67f718 DM |
602 | /* We take possession of the kmsg struct now */ |
603 | m->kdbus = k; | |
604 | m->release_kdbus = true; | |
605 | m->free_fds = true; | |
606 | fds = NULL; | |
777d7a61 | 607 | |
cb67f718 | 608 | bus->rqueue[bus->rqueue_size++] = m; |
777d7a61 | 609 | |
cb67f718 | 610 | return 1; |
777d7a61 | 611 | |
cb67f718 DM |
612 | fail: |
613 | if (m) { | |
614 | struct bus_body_part *part; | |
615 | unsigned i; | |
777d7a61 | 616 | |
cb67f718 DM |
617 | /* Make sure the memfds are not freed twice */ |
618 | MESSAGE_FOREACH_PART(part, i, m) | |
619 | if (part->memfd >= 0) | |
620 | part->memfd = -1; | |
777d7a61 | 621 | |
cb67f718 DM |
622 | sd_bus_message_unref(m); |
623 | } | |
777d7a61 | 624 | |
cb67f718 DM |
625 | return r; |
626 | } | |
777d7a61 | 627 | |
cb67f718 DM |
628 | int bus_kernel_take_fd(sd_bus *b) { |
629 | struct kdbus_cmd_hello *hello; | |
630 | struct kdbus_item *item; | |
631 | size_t l = 0, sz; | |
632 | int r; | |
777d7a61 | 633 | |
cb67f718 | 634 | assert(b); |
7adc46fc | 635 | |
cb67f718 DM |
636 | if (b->is_server) |
637 | return -EINVAL; | |
777d7a61 | 638 | |
cb67f718 | 639 | b->use_memfd = 1; |
777d7a61 | 640 | |
cb67f718 | 641 | sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)); |
777d7a61 | 642 | |
cb67f718 DM |
643 | if (b->fake_creds_valid) |
644 | sz += ALIGN8(offsetof(struct kdbus_item, creds)) + sizeof(struct kdbus_creds); | |
777d7a61 | 645 | |
cb67f718 DM |
646 | if (b->fake_label) { |
647 | l = strlen(b->fake_label); | |
648 | sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1); | |
649 | } | |
777d7a61 | 650 | |
cb67f718 DM |
651 | hello = alloca0(sz); |
652 | hello->size = sz; | |
653 | hello->conn_flags = b->hello_flags; | |
654 | hello->attach_flags = b->attach_flags; | |
655 | hello->pool_size = KDBUS_POOL_SIZE; | |
777d7a61 | 656 | |
cb67f718 DM |
657 | item = hello->items; |
658 | ||
659 | if (b->fake_creds_valid) { | |
660 | item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds); | |
661 | item->type = KDBUS_ITEM_CREDS; | |
662 | item->creds = b->fake_creds; | |
663 | ||
664 | item = KDBUS_ITEM_NEXT(item); | |
777d7a61 LP |
665 | } |
666 | ||
cb67f718 DM |
667 | if (b->fake_label) { |
668 | item->size = offsetof(struct kdbus_item, str) + l + 1; | |
669 | memcpy(item->str, b->fake_label, l+1); | |
777d7a61 LP |
670 | } |
671 | ||
cb67f718 DM |
672 | r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello); |
673 | if (r < 0) | |
674 | return -errno; | |
777d7a61 | 675 | |
cb67f718 DM |
676 | if (!b->kdbus_buffer) { |
677 | b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0); | |
678 | if (b->kdbus_buffer == MAP_FAILED) { | |
679 | b->kdbus_buffer = NULL; | |
680 | return -errno; | |
681 | } | |
682 | } | |
6629161f | 683 | |
cb67f718 DM |
684 | /* The higher 32bit of both flags fields are considered |
685 | * 'incompatible flags'. Refuse them all for now. */ | |
686 | if (hello->bus_flags > 0xFFFFFFFFULL || | |
687 | hello->conn_flags > 0xFFFFFFFFULL) | |
688 | return -ENOTSUP; | |
6629161f | 689 | |
cb67f718 DM |
690 | if (hello->bloom_size != BLOOM_SIZE) |
691 | return -ENOTSUP; | |
6629161f | 692 | |
cb67f718 DM |
693 | if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) |
694 | return -ENOMEM; | |
6629161f | 695 | |
cb67f718 | 696 | b->unique_id = hello->id; |
6629161f | 697 | |
cb67f718 DM |
698 | b->is_kernel = true; |
699 | b->bus_client = true; | |
700 | b->can_fds = !!(hello->conn_flags & KDBUS_HELLO_ACCEPT_FD); | |
701 | b->message_version = 2; | |
702 | b->message_endian = BUS_NATIVE_ENDIAN; | |
c91cb83c | 703 | |
cb67f718 DM |
704 | /* the kernel told us the UUID of the underlying bus */ |
705 | memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes)); | |
6629161f | 706 | |
cb67f718 DM |
707 | return bus_start_running(b); |
708 | } | |
6629161f | 709 | |
cb67f718 DM |
710 | int bus_kernel_connect(sd_bus *b) { |
711 | assert(b); | |
712 | assert(b->input_fd < 0); | |
713 | assert(b->output_fd < 0); | |
714 | assert(b->kernel); | |
1307c3ff | 715 | |
cb67f718 DM |
716 | if (b->is_server) |
717 | return -EINVAL; | |
1307c3ff | 718 | |
cb67f718 DM |
719 | b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC); |
720 | if (b->input_fd < 0) | |
721 | return -errno; | |
6629161f | 722 | |
cb67f718 | 723 | b->output_fd = b->input_fd; |
6629161f | 724 | |
cb67f718 DM |
725 | return bus_kernel_take_fd(b); |
726 | } | |
f9be01f3 | 727 | |
069f5e61 LP |
728 | static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { |
729 | uint64_t off; | |
730 | struct kdbus_item *d; | |
731 | ||
732 | assert(bus); | |
733 | assert(k); | |
734 | ||
735 | off = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer; | |
736 | ioctl(bus->input_fd, KDBUS_CMD_FREE, &off); | |
737 | ||
738 | KDBUS_ITEM_FOREACH(d, k, items) { | |
739 | ||
740 | if (d->type == KDBUS_ITEM_FDS) | |
741 | close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int)); | |
742 | else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD) | |
743 | close_nointr_nofail(d->memfd.fd); | |
744 | } | |
745 | } | |
746 | ||
747 | int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) { | |
cb67f718 | 748 | int r; |
6629161f | 749 | |
cb67f718 DM |
750 | assert(bus); |
751 | assert(m); | |
752 | assert(bus->state == BUS_RUNNING); | |
6629161f | 753 | |
cb67f718 DM |
754 | /* If we can't deliver, we want room for the error message */ |
755 | r = bus_rqueue_make_room(bus); | |
6629161f LP |
756 | if (r < 0) |
757 | return r; | |
758 | ||
cb67f718 | 759 | r = bus_message_setup_kmsg(bus, m); |
6629161f LP |
760 | if (r < 0) |
761 | return r; | |
762 | ||
069f5e61 LP |
763 | /* If this is a synchronous method call, then let's tell the |
764 | * kernel, so that it can pass CPU time/scheduling to the | |
765 | * destination for the time, if it wants to. If we | |
766 | * synchronously wait for the result anyway, we won't need CPU | |
767 | * anyway. */ | |
768 | if (hint_sync_call) | |
769 | m->kdbus->flags |= KDBUS_MSG_FLAGS_EXPECT_REPLY|KDBUS_MSG_FLAGS_SYNC_REPLY; | |
770 | ||
cb67f718 DM |
771 | r = ioctl(bus->output_fd, KDBUS_CMD_MSG_SEND, m->kdbus); |
772 | if (r < 0) { | |
773 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
774 | sd_bus_message *reply; | |
253ce82b | 775 | |
cb67f718 DM |
776 | if (errno == EAGAIN || errno == EINTR) |
777 | return 0; | |
778 | else if (errno == ENXIO || errno == ESRCH) { | |
6629161f | 779 | |
cb67f718 DM |
780 | /* ENXIO: unique name not known |
781 | * ESRCH: well-known name not known */ | |
6629161f | 782 | |
cb67f718 DM |
783 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
784 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination); | |
785 | else { | |
786 | log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination); | |
787 | return 0; | |
788 | } | |
777d7a61 | 789 | |
cb67f718 | 790 | } else if (errno == EADDRNOTAVAIL) { |
fd8d62d9 | 791 | |
cb67f718 | 792 | /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */ |
bc7fd8cd | 793 | |
cb67f718 DM |
794 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
795 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination); | |
796 | else { | |
797 | log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination); | |
798 | return 0; | |
799 | } | |
800 | } else | |
801 | return -errno; | |
bc7fd8cd | 802 | |
cb67f718 DM |
803 | r = bus_message_new_synthetic_error( |
804 | bus, | |
805 | BUS_MESSAGE_COOKIE(m), | |
806 | &error, | |
807 | &reply); | |
bc7fd8cd | 808 | |
cb67f718 DM |
809 | if (r < 0) |
810 | return r; | |
bc7fd8cd | 811 | |
cb67f718 DM |
812 | r = bus_seal_synthetic_message(bus, reply); |
813 | if (r < 0) | |
814 | return r; | |
62b3e928 | 815 | |
cb67f718 | 816 | bus->rqueue[bus->rqueue_size++] = reply; |
bc7fd8cd | 817 | |
069f5e61 LP |
818 | } else if (hint_sync_call) { |
819 | struct kdbus_msg *k; | |
fd8d62d9 | 820 | |
069f5e61 LP |
821 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + m->kdbus->offset_reply); |
822 | assert(k); | |
777d7a61 | 823 | |
069f5e61 | 824 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
1307c3ff | 825 | |
069f5e61 LP |
826 | r = bus_kernel_make_message(bus, k); |
827 | if (r < 0) { | |
828 | close_kdbus_msg(bus, k); | |
1307c3ff | 829 | |
069f5e61 LP |
830 | /* Anybody can send us invalid messages, let's just drop them. */ |
831 | if (r == -EBADMSG || r == -EPROTOTYPE) | |
832 | log_debug("Ignoring invalid message: %s", strerror(-r)); | |
833 | else | |
834 | return r; | |
835 | } | |
836 | } else { | |
837 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
838 | close_kdbus_msg(bus, k); | |
839 | } | |
cb67f718 | 840 | } |
069f5e61 LP |
841 | |
842 | return 1; | |
cb67f718 | 843 | } |
69aec65c | 844 | |
cb67f718 DM |
845 | static int push_name_owner_changed(sd_bus *bus, const char *name, const char *old_owner, const char *new_owner) { |
846 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; | |
847 | int r; | |
2dc9970b | 848 | |
cb67f718 | 849 | assert(bus); |
2dc9970b | 850 | |
cb67f718 DM |
851 | r = sd_bus_message_new_signal( |
852 | bus, | |
853 | "/org/freedesktop/DBus", | |
854 | "org.freedesktop.DBus", | |
855 | "NameOwnerChanged", | |
856 | &m); | |
857 | if (r < 0) | |
858 | return r; | |
2dc9970b | 859 | |
cb67f718 DM |
860 | r = sd_bus_message_append(m, "sss", name, old_owner, new_owner); |
861 | if (r < 0) | |
862 | return r; | |
5b12334d | 863 | |
cb67f718 | 864 | m->sender = "org.freedesktop.DBus"; |
5b12334d | 865 | |
cb67f718 DM |
866 | r = bus_seal_synthetic_message(bus, m); |
867 | if (r < 0) | |
868 | return r; | |
5b12334d | 869 | |
cb67f718 DM |
870 | bus->rqueue[bus->rqueue_size++] = m; |
871 | m = NULL; | |
5b12334d | 872 | |
cb67f718 DM |
873 | return 1; |
874 | } | |
5b12334d | 875 | |
cb67f718 DM |
876 | static int translate_name_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { |
877 | char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX]; | |
5b12334d | 878 | |
cb67f718 DM |
879 | assert(bus); |
880 | assert(k); | |
881 | assert(d); | |
751bc6ac | 882 | |
cb67f718 DM |
883 | if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) |
884 | old_owner[0] = 0; | |
885 | else | |
886 | sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old.id); | |
751bc6ac | 887 | |
cb67f718 | 888 | if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) { |
751bc6ac | 889 | |
cb67f718 DM |
890 | if (isempty(old_owner)) |
891 | return 0; | |
5b12334d | 892 | |
cb67f718 DM |
893 | new_owner[0] = 0; |
894 | } else | |
895 | sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new.id); | |
5b12334d | 896 | |
cb67f718 DM |
897 | return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner); |
898 | } | |
5b12334d | 899 | |
cb67f718 DM |
900 | static int translate_id_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { |
901 | char owner[UNIQUE_NAME_MAX]; | |
2e2ec0ea | 902 | |
cb67f718 DM |
903 | assert(bus); |
904 | assert(k); | |
905 | assert(d); | |
777d7a61 | 906 | |
cb67f718 | 907 | sprintf(owner, ":1.%llu", d->id_change.id); |
2e2ec0ea | 908 | |
cb67f718 DM |
909 | return push_name_owner_changed( |
910 | bus, owner, | |
911 | d->type == KDBUS_ITEM_ID_ADD ? NULL : owner, | |
912 | d->type == KDBUS_ITEM_ID_ADD ? owner : NULL); | |
913 | } | |
49b832c5 | 914 | |
cb67f718 DM |
915 | static int translate_reply(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { |
916 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; | |
917 | int r; | |
777d7a61 | 918 | |
cb67f718 DM |
919 | assert(bus); |
920 | assert(k); | |
921 | assert(d); | |
acb5a3cb | 922 | |
cb67f718 DM |
923 | r = bus_message_new_synthetic_error( |
924 | bus, | |
925 | k->cookie_reply, | |
926 | d->type == KDBUS_ITEM_REPLY_TIMEOUT ? | |
927 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") : | |
928 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"), | |
929 | &m); | |
1307c3ff | 930 | if (r < 0) |
cb67f718 | 931 | return r; |
51038c03 | 932 | |
cb67f718 | 933 | m->sender = "org.freedesktop.DBus"; |
51038c03 | 934 | |
cb67f718 DM |
935 | r = bus_seal_synthetic_message(bus, m); |
936 | if (r < 0) | |
937 | return r; | |
6629161f | 938 | |
7adc46fc | 939 | bus->rqueue[bus->rqueue_size++] = m; |
cb67f718 | 940 | m = NULL; |
7d22c717 | 941 | |
6629161f | 942 | return 1; |
cb67f718 | 943 | } |
1307c3ff | 944 | |
cb67f718 DM |
945 | static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) { |
946 | struct kdbus_item *d, *found = NULL; | |
1307c3ff | 947 | |
cb67f718 DM |
948 | static int (* const translate[])(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) = { |
949 | [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
950 | [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
951 | [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1307c3ff | 952 | |
cb67f718 DM |
953 | [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, |
954 | [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, | |
955 | ||
956 | [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
957 | [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
958 | }; | |
959 | ||
960 | assert(bus); | |
961 | assert(k); | |
962 | assert(k->payload_type == KDBUS_PAYLOAD_KERNEL); | |
963 | ||
964 | KDBUS_ITEM_FOREACH(d, k, items) { | |
965 | if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) { | |
966 | if (found) | |
967 | return -EBADMSG; | |
968 | found = d; | |
969 | } else | |
970 | log_debug("Got unknown field from kernel %llu", d->type); | |
1307c3ff LP |
971 | } |
972 | ||
cb67f718 DM |
973 | if (!found) { |
974 | log_debug("Didn't find a kernel message to translate."); | |
975 | return 0; | |
976 | } | |
977 | ||
978 | return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found); | |
6629161f LP |
979 | } |
980 | ||
7d22c717 | 981 | int bus_kernel_read_message(sd_bus *bus) { |
9ff1897b | 982 | struct kdbus_cmd_recv recv = {}; |
6629161f | 983 | struct kdbus_msg *k; |
6629161f LP |
984 | int r; |
985 | ||
986 | assert(bus); | |
7d22c717 | 987 | |
7adc46fc | 988 | r = bus_rqueue_make_room(bus); |
7d22c717 LP |
989 | if (r < 0) |
990 | return r; | |
6629161f | 991 | |
9ff1897b | 992 | r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &recv); |
fd8d62d9 | 993 | if (r < 0) { |
6629161f LP |
994 | if (errno == EAGAIN) |
995 | return 0; | |
996 | ||
fd8d62d9 | 997 | return -errno; |
6629161f LP |
998 | } |
999 | ||
069f5e61 | 1000 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.offset); |
e1d337d4 | 1001 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
7d22c717 | 1002 | r = bus_kernel_make_message(bus, k); |
e1d337d4 LP |
1003 | |
1004 | /* Anybody can send us invalid messages, let's just drop them. */ | |
1005 | if (r == -EBADMSG || r == -EPROTOTYPE) { | |
ff4994c5 | 1006 | log_debug("Ignoring invalid message: %s", strerror(-r)); |
e1d337d4 LP |
1007 | r = 0; |
1008 | } | |
1009 | ||
1010 | } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) | |
7d22c717 | 1011 | r = bus_kernel_translate_message(bus, k); |
069f5e61 LP |
1012 | else { |
1013 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
777d7a61 | 1014 | r = 0; |
069f5e61 | 1015 | } |
777d7a61 | 1016 | |
fd8d62d9 LP |
1017 | if (r <= 0) |
1018 | close_kdbus_msg(bus, k); | |
6629161f | 1019 | |
51038c03 | 1020 | return r < 0 ? r : 1; |
6629161f LP |
1021 | } |
1022 | ||
8e959fbf | 1023 | int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) { |
bc7fd8cd | 1024 | struct memfd_cache *c; |
45fbe937 | 1025 | int fd; |
bc7fd8cd LP |
1026 | |
1027 | assert(address); | |
8e959fbf LP |
1028 | assert(mapped); |
1029 | assert(allocated); | |
35460afc LP |
1030 | |
1031 | if (!bus || !bus->is_kernel) | |
1032 | return -ENOTSUP; | |
bc7fd8cd | 1033 | |
76b7742c | 1034 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
45fbe937 | 1035 | |
bc7fd8cd | 1036 | if (bus->n_memfd_cache <= 0) { |
135a4eb4 KS |
1037 | struct kdbus_cmd_memfd_make cmd = { |
1038 | .size = sizeof(struct kdbus_cmd_memfd_make), | |
1039 | }; | |
45fbe937 LP |
1040 | int r; |
1041 | ||
76b7742c | 1042 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1043 | |
135a4eb4 | 1044 | r = ioctl(bus->input_fd, KDBUS_CMD_MEMFD_NEW, &cmd); |
9b05bc48 | 1045 | if (r < 0) |
bc7fd8cd LP |
1046 | return -errno; |
1047 | ||
1048 | *address = NULL; | |
8e959fbf LP |
1049 | *mapped = 0; |
1050 | *allocated = 0; | |
135a4eb4 | 1051 | return cmd.fd; |
bc7fd8cd LP |
1052 | } |
1053 | ||
bf30e48f | 1054 | c = &bus->memfd_cache[--bus->n_memfd_cache]; |
bc7fd8cd LP |
1055 | |
1056 | assert(c->fd >= 0); | |
8e959fbf | 1057 | assert(c->mapped == 0 || c->address); |
bc7fd8cd LP |
1058 | |
1059 | *address = c->address; | |
8e959fbf LP |
1060 | *mapped = c->mapped; |
1061 | *allocated = c->allocated; | |
45fbe937 LP |
1062 | fd = c->fd; |
1063 | ||
76b7742c | 1064 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1065 | |
45fbe937 LP |
1066 | return fd; |
1067 | } | |
1068 | ||
1069 | static void close_and_munmap(int fd, void *address, size_t size) { | |
1070 | if (size > 0) | |
76b7742c | 1071 | assert_se(munmap(address, PAGE_ALIGN(size)) >= 0); |
45fbe937 LP |
1072 | |
1073 | close_nointr_nofail(fd); | |
bc7fd8cd LP |
1074 | } |
1075 | ||
8e959fbf | 1076 | void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) { |
bc7fd8cd | 1077 | struct memfd_cache *c; |
8e959fbf | 1078 | uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX); |
bc7fd8cd LP |
1079 | |
1080 | assert(fd >= 0); | |
8e959fbf | 1081 | assert(mapped == 0 || address); |
bc7fd8cd | 1082 | |
45fbe937 | 1083 | if (!bus || !bus->is_kernel) { |
8e959fbf | 1084 | close_and_munmap(fd, address, mapped); |
45fbe937 LP |
1085 | return; |
1086 | } | |
1087 | ||
76b7742c | 1088 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1089 | |
45fbe937 | 1090 | if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) { |
76b7742c | 1091 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1092 | |
8e959fbf | 1093 | close_and_munmap(fd, address, mapped); |
bc7fd8cd LP |
1094 | return; |
1095 | } | |
1096 | ||
1097 | c = &bus->memfd_cache[bus->n_memfd_cache++]; | |
1098 | c->fd = fd; | |
1099 | c->address = address; | |
1100 | ||
1101 | /* If overly long, let's return a bit to the OS */ | |
8e959fbf LP |
1102 | if (mapped > max_mapped) { |
1103 | assert_se(ioctl(fd, KDBUS_CMD_MEMFD_SIZE_SET, &max_mapped) >= 0); | |
1104 | assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0); | |
1105 | c->mapped = c->allocated = max_mapped; | |
1106 | } else { | |
1107 | c->mapped = mapped; | |
1108 | c->allocated = allocated; | |
1109 | } | |
45fbe937 | 1110 | |
76b7742c | 1111 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd LP |
1112 | } |
1113 | ||
1114 | void bus_kernel_flush_memfd(sd_bus *b) { | |
1115 | unsigned i; | |
1116 | ||
1117 | assert(b); | |
1118 | ||
76b7742c | 1119 | for (i = 0; i < b->n_memfd_cache; i++) |
8e959fbf | 1120 | close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped); |
bc7fd8cd | 1121 | } |
0253ddcc | 1122 | |
e3dd987c LP |
1123 | int kdbus_translate_request_name_flags(uint64_t flags, uint64_t *kdbus_flags) { |
1124 | uint64_t f = 0; | |
0253ddcc | 1125 | |
e3dd987c | 1126 | assert(kdbus_flags); |
0253ddcc | 1127 | |
e3dd987c LP |
1128 | if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT) |
1129 | f |= KDBUS_NAME_ALLOW_REPLACEMENT; | |
0253ddcc | 1130 | |
e3dd987c LP |
1131 | if (flags & SD_BUS_NAME_REPLACE_EXISTING) |
1132 | f |= KDBUS_NAME_REPLACE_EXISTING; | |
0253ddcc | 1133 | |
d90bb669 | 1134 | if (flags & SD_BUS_NAME_QUEUE) |
e3dd987c | 1135 | f |= KDBUS_NAME_QUEUE; |
0253ddcc | 1136 | |
e3dd987c LP |
1137 | *kdbus_flags = f; |
1138 | return 0; | |
1139 | } | |
1140 | ||
1141 | int kdbus_translate_attach_flags(uint64_t mask, uint64_t *kdbus_mask) { | |
1142 | uint64_t m = 0; | |
1143 | ||
1144 | assert(kdbus_mask); | |
1145 | ||
1146 | if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID)) | |
1147 | m |= KDBUS_ATTACH_CREDS; | |
1148 | ||
1149 | if (mask & (SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM)) | |
1150 | m |= KDBUS_ATTACH_COMM; | |
1151 | ||
1152 | if (mask & SD_BUS_CREDS_EXE) | |
1153 | m |= KDBUS_ATTACH_EXE; | |
1154 | ||
1155 | if (mask & SD_BUS_CREDS_CMDLINE) | |
1156 | m |= KDBUS_ATTACH_CMDLINE; | |
1157 | ||
1158 | 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)) | |
1159 | m |= KDBUS_ATTACH_CGROUP; | |
1160 | ||
1161 | if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) | |
1162 | m |= KDBUS_ATTACH_CAPS; | |
1163 | ||
1164 | if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) | |
1165 | m |= KDBUS_ATTACH_SECLABEL; | |
0253ddcc | 1166 | |
e3dd987c LP |
1167 | if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) |
1168 | m |= KDBUS_ATTACH_AUDIT; | |
1169 | ||
49b832c5 LP |
1170 | if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) |
1171 | m |= KDBUS_ATTACH_NAMES; | |
1172 | ||
e3dd987c | 1173 | *kdbus_mask = m; |
0253ddcc DM |
1174 | return 0; |
1175 | } | |
e3dd987c | 1176 | |
f2769777 | 1177 | int bus_kernel_create_bus(const char *name, bool world, char **s) { |
816a3f9e | 1178 | struct kdbus_cmd_make *make; |
e3dd987c LP |
1179 | struct kdbus_item *n; |
1180 | int fd; | |
1181 | ||
1182 | assert(name); | |
1183 | assert(s); | |
1184 | ||
1185 | fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1186 | if (fd < 0) | |
1187 | return -errno; | |
1188 | ||
816a3f9e DM |
1189 | make = alloca0(ALIGN8(offsetof(struct kdbus_cmd_make, items) + |
1190 | offsetof(struct kdbus_item, data64) + sizeof(uint64_t) + | |
e3dd987c LP |
1191 | offsetof(struct kdbus_item, str) + |
1192 | DECIMAL_STR_MAX(uid_t) + 1 + strlen(name) + 1)); | |
1193 | ||
816a3f9e DM |
1194 | make->size = offsetof(struct kdbus_cmd_make, items); |
1195 | ||
e3dd987c | 1196 | n = make->items; |
816a3f9e DM |
1197 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); |
1198 | n->type = KDBUS_ITEM_BLOOM_SIZE; | |
1199 | n->data64[0] = BLOOM_SIZE; | |
1200 | assert_cc(BLOOM_SIZE % 8 == 0); | |
1201 | make->size += ALIGN8(n->size); | |
1202 | ||
1203 | n = KDBUS_ITEM_NEXT(n); | |
e3dd987c LP |
1204 | sprintf(n->str, "%lu-%s", (unsigned long) getuid(), name); |
1205 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
5e16c257 | 1206 | n->type = KDBUS_ITEM_MAKE_NAME; |
816a3f9e | 1207 | make->size += ALIGN8(n->size); |
e3dd987c | 1208 | |
f2769777 | 1209 | make->flags = KDBUS_MAKE_POLICY_OPEN | (world ? KDBUS_MAKE_ACCESS_WORLD : 0); |
e3dd987c LP |
1210 | |
1211 | if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { | |
1212 | close_nointr_nofail(fd); | |
1213 | return -errno; | |
1214 | } | |
1215 | ||
f9638db8 LP |
1216 | /* The higher 32bit of the flags field are considered |
1217 | * 'incompatible flags'. Refuse them all for now. */ | |
1218 | if (make->flags > 0xFFFFFFFFULL) { | |
1219 | close_nointr_nofail(fd); | |
1220 | return -ENOTSUP; | |
1221 | } | |
1222 | ||
e3dd987c LP |
1223 | if (s) { |
1224 | char *p; | |
1225 | ||
1226 | p = strjoin("/dev/kdbus/", n->str, "/bus", NULL); | |
1227 | if (!p) { | |
1228 | close_nointr_nofail(fd); | |
1229 | return -ENOMEM; | |
1230 | } | |
1231 | ||
1232 | *s = p; | |
1233 | } | |
1234 | ||
1235 | return fd; | |
1236 | } | |
9bd37b40 | 1237 | |
e821075a LP |
1238 | int bus_kernel_create_starter(const char *bus, const char *name) { |
1239 | struct kdbus_cmd_hello *hello; | |
1240 | struct kdbus_item *n; | |
1241 | char *p; | |
1242 | int fd; | |
1243 | ||
1244 | assert(bus); | |
1245 | assert(name); | |
1246 | ||
1247 | p = alloca(sizeof("/dev/kdbus/") - 1 + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + sizeof("/bus")); | |
1248 | sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus); | |
1249 | ||
1250 | fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1251 | if (fd < 0) | |
1252 | return -errno; | |
1253 | ||
1254 | hello = alloca0(ALIGN8(offsetof(struct kdbus_cmd_hello, items) + | |
1255 | offsetof(struct kdbus_item, str) + | |
1256 | strlen(name) + 1)); | |
1257 | ||
1258 | n = hello->items; | |
1259 | strcpy(n->str, name); | |
1260 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
613ec4b8 | 1261 | n->type = KDBUS_ITEM_NAME; |
e821075a LP |
1262 | |
1263 | hello->size = ALIGN8(offsetof(struct kdbus_cmd_hello, items) + n->size); | |
07442eff | 1264 | hello->conn_flags = KDBUS_HELLO_ACTIVATOR; |
e821075a LP |
1265 | hello->pool_size = KDBUS_POOL_SIZE; |
1266 | ||
1267 | if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) { | |
1268 | close_nointr_nofail(fd); | |
1269 | return -errno; | |
1270 | } | |
1271 | ||
1272 | /* The higher 32bit of both flags fields are considered | |
1273 | * 'incompatible flags'. Refuse them all for now. */ | |
1274 | if (hello->bus_flags > 0xFFFFFFFFULL || | |
1275 | hello->conn_flags > 0xFFFFFFFFULL) { | |
1276 | close_nointr_nofail(fd); | |
1277 | return -ENOTSUP; | |
1278 | } | |
1279 | ||
1280 | if (hello->bloom_size != BLOOM_SIZE) { | |
1281 | close_nointr_nofail(fd); | |
1282 | return -ENOTSUP; | |
1283 | } | |
1284 | ||
1285 | return fd; | |
1286 | } | |
1287 | ||
9bd37b40 | 1288 | int bus_kernel_create_namespace(const char *name, char **s) { |
816a3f9e | 1289 | struct kdbus_cmd_make *make; |
9bd37b40 LP |
1290 | struct kdbus_item *n; |
1291 | int fd; | |
1292 | ||
1293 | assert(name); | |
1294 | assert(s); | |
1295 | ||
1296 | fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1297 | if (fd < 0) | |
1298 | return -errno; | |
1299 | ||
816a3f9e | 1300 | make = alloca0(ALIGN8(offsetof(struct kdbus_cmd_make, items) + |
9bd37b40 LP |
1301 | offsetof(struct kdbus_item, str) + |
1302 | strlen(name) + 1)); | |
1303 | ||
1304 | n = make->items; | |
1305 | strcpy(n->str, name); | |
1306 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
5e16c257 | 1307 | n->type = KDBUS_ITEM_MAKE_NAME; |
9bd37b40 | 1308 | |
816a3f9e | 1309 | make->size = ALIGN8(offsetof(struct kdbus_cmd_make, items) + n->size); |
fd5b0b91 | 1310 | make->flags = KDBUS_MAKE_POLICY_OPEN | KDBUS_MAKE_ACCESS_WORLD; |
9bd37b40 LP |
1311 | |
1312 | if (ioctl(fd, KDBUS_CMD_NS_MAKE, make) < 0) { | |
1313 | close_nointr_nofail(fd); | |
1314 | return -errno; | |
1315 | } | |
1316 | ||
f9638db8 LP |
1317 | /* The higher 32bit of the flags field are considered |
1318 | * 'incompatible flags'. Refuse them all for now. */ | |
1319 | if (make->flags > 0xFFFFFFFFULL) { | |
1320 | close_nointr_nofail(fd); | |
1321 | return -ENOTSUP; | |
1322 | } | |
1323 | ||
9bd37b40 LP |
1324 | if (s) { |
1325 | char *p; | |
1326 | ||
f8a2d1c9 | 1327 | p = strappend("/dev/kdbus/ns/", name); |
9bd37b40 LP |
1328 | if (!p) { |
1329 | close_nointr_nofail(fd); | |
1330 | return -ENOMEM; | |
1331 | } | |
1332 | ||
1333 | *s = p; | |
1334 | } | |
1335 | ||
1336 | return fd; | |
1337 | } | |
c8fa3f60 | 1338 | |
b6c631f3 KS |
1339 | int bus_kernel_create_monitor(const char *bus) { |
1340 | struct kdbus_cmd_hello *hello; | |
1341 | char *p; | |
1342 | int fd; | |
c8fa3f60 LS |
1343 | |
1344 | assert(bus); | |
1345 | ||
b6c631f3 KS |
1346 | p = alloca(sizeof("/dev/kdbus/") - 1 + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + sizeof("/bus")); |
1347 | sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus); | |
c8fa3f60 | 1348 | |
b6c631f3 KS |
1349 | fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); |
1350 | if (fd < 0) | |
c8fa3f60 LS |
1351 | return -errno; |
1352 | ||
b6c631f3 KS |
1353 | hello = alloca0(sizeof(struct kdbus_cmd_hello)); |
1354 | hello->size = sizeof(struct kdbus_cmd_hello); | |
1355 | hello->conn_flags = KDBUS_HELLO_ACTIVATOR; | |
1356 | hello->pool_size = KDBUS_POOL_SIZE; | |
1357 | ||
1358 | if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) { | |
1359 | close_nointr_nofail(fd); | |
1360 | return -errno; | |
1361 | } | |
1362 | ||
1363 | /* The higher 32bit of both flags fields are considered | |
1364 | * 'incompatible flags'. Refuse them all for now. */ | |
1365 | if (hello->bus_flags > 0xFFFFFFFFULL || | |
1366 | hello->conn_flags > 0xFFFFFFFFULL) { | |
1367 | close_nointr_nofail(fd); | |
1368 | return -ENOTSUP; | |
1369 | } | |
1370 | ||
1371 | return fd; | |
c8fa3f60 | 1372 | } |
ae095f86 LP |
1373 | |
1374 | int bus_kernel_try_close(sd_bus *bus) { | |
1375 | assert(bus); | |
1376 | assert(bus->is_kernel); | |
1377 | ||
1378 | if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE) < 0) | |
1379 | return -errno; | |
1380 | ||
1381 | return 0; | |
1382 | } |