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Commit | Line | Data |
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6629161f LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2013 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
7211f918 LP |
20 | #ifdef HAVE_VALGRIND_MEMCHECK_H |
21 | #include <valgrind/memcheck.h> | |
22 | #endif | |
23 | ||
6629161f | 24 | #include <fcntl.h> |
c556fe79 | 25 | #include <malloc.h> |
fd8d62d9 | 26 | #include <sys/mman.h> |
5972fe95 | 27 | #include <sys/prctl.h> |
6629161f | 28 | |
eef46c37 | 29 | /* When we include libgen.h because we need dirname() we immediately |
11c9f1e4 SM |
30 | * undefine basename() since libgen.h defines it as a macro to the POSIX |
31 | * version which is really broken. We prefer GNU basename(). */ | |
eef46c37 LP |
32 | #include <libgen.h> |
33 | #undef basename | |
34 | ||
b5efdb8a | 35 | #include "alloc-util.h" |
07630cea LP |
36 | #include "bus-bloom.h" |
37 | #include "bus-internal.h" | |
3ffd4af2 | 38 | #include "bus-kernel.h" |
07630cea LP |
39 | #include "bus-label.h" |
40 | #include "bus-message.h" | |
41 | #include "bus-util.h" | |
430f0182 | 42 | #include "capability-util.h" |
3ffd4af2 | 43 | #include "fd-util.h" |
1a299299 | 44 | #include "fileio.h" |
6482f626 | 45 | #include "formats-util.h" |
07630cea | 46 | #include "memfd-util.h" |
6bedfcbb | 47 | #include "parse-util.h" |
d054f0a4 | 48 | #include "stdio-util.h" |
07630cea LP |
49 | #include "string-util.h" |
50 | #include "strv.h" | |
ee104e11 | 51 | #include "user-util.h" |
07630cea | 52 | #include "util.h" |
777d7a61 LP |
53 | |
54 | #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t)) | |
6629161f | 55 | |
c7819669 | 56 | int bus_kernel_parse_unique_name(const char *s, uint64_t *id) { |
6629161f LP |
57 | int r; |
58 | ||
59 | assert(s); | |
60 | assert(id); | |
61 | ||
62 | if (!startswith(s, ":1.")) | |
63 | return 0; | |
64 | ||
65 | r = safe_atou64(s + 3, id); | |
66 | if (r < 0) | |
67 | return r; | |
68 | ||
69 | return 1; | |
70 | } | |
71 | ||
febfd508 | 72 | static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) { |
6629161f | 73 | assert(d); |
6629161f LP |
74 | assert(sz > 0); |
75 | ||
e86b80b8 LP |
76 | *d = ALIGN8_PTR(*d); |
77 | ||
66b26c5c LP |
78 | /* Note that p can be NULL, which encodes a region full of |
79 | * zeroes, which is useful to optimize certain padding | |
80 | * conditions */ | |
81 | ||
febfd508 | 82 | (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec); |
ea1edece | 83 | (*d)->type = KDBUS_ITEM_PAYLOAD_VEC; |
a392d361 | 84 | (*d)->vec.address = PTR_TO_UINT64(p); |
6629161f LP |
85 | (*d)->vec.size = sz; |
86 | ||
febfd508 | 87 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
88 | } |
89 | ||
77adde63 | 90 | static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t start, size_t sz) { |
a392d361 LP |
91 | assert(d); |
92 | assert(memfd >= 0); | |
93 | assert(sz > 0); | |
94 | ||
95 | *d = ALIGN8_PTR(*d); | |
96 | (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd); | |
ea1edece | 97 | (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD; |
a392d361 | 98 | (*d)->memfd.fd = memfd; |
77adde63 | 99 | (*d)->memfd.start = start; |
a392d361 LP |
100 | (*d)->memfd.size = sz; |
101 | ||
102 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); | |
103 | } | |
104 | ||
febfd508 | 105 | static void append_destination(struct kdbus_item **d, const char *s, size_t length) { |
6629161f | 106 | assert(d); |
b5baa8fe | 107 | assert(s); |
6629161f | 108 | |
e86b80b8 LP |
109 | *d = ALIGN8_PTR(*d); |
110 | ||
febfd508 | 111 | (*d)->size = offsetof(struct kdbus_item, str) + length + 1; |
ea1edece | 112 | (*d)->type = KDBUS_ITEM_DST_NAME; |
51038c03 | 113 | memcpy((*d)->str, s, length + 1); |
6629161f | 114 | |
febfd508 | 115 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
116 | } |
117 | ||
18a28147 KS |
118 | static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) { |
119 | struct kdbus_item *i; | |
a56f19c4 | 120 | |
b5baa8fe | 121 | assert(d); |
b5baa8fe | 122 | |
18a28147 | 123 | i = ALIGN8_PTR(*d); |
b5baa8fe | 124 | |
18a28147 KS |
125 | i->size = offsetof(struct kdbus_item, bloom_filter) + |
126 | offsetof(struct kdbus_bloom_filter, data) + | |
127 | length; | |
128 | i->type = KDBUS_ITEM_BLOOM_FILTER; | |
b5baa8fe | 129 | |
18a28147 | 130 | *d = (struct kdbus_item *) ((uint8_t*) i + i->size); |
a56f19c4 | 131 | |
18a28147 | 132 | return &i->bloom_filter; |
a56f19c4 LP |
133 | } |
134 | ||
febfd508 | 135 | static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) { |
9097fe29 LP |
136 | assert(d); |
137 | assert(fds); | |
138 | assert(n_fds > 0); | |
139 | ||
140 | *d = ALIGN8_PTR(*d); | |
febfd508 | 141 | (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds; |
ea1edece | 142 | (*d)->type = KDBUS_ITEM_FDS; |
9097fe29 LP |
143 | memcpy((*d)->fds, fds, sizeof(int) * n_fds); |
144 | ||
febfd508 | 145 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
9097fe29 LP |
146 | } |
147 | ||
1abe54d9 LP |
148 | static void add_bloom_arg(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) { |
149 | char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")]; | |
150 | char *e; | |
151 | ||
152 | assert(data); | |
153 | assert(size > 0); | |
154 | assert(i < 64); | |
155 | assert(t); | |
156 | ||
157 | e = stpcpy(buf, "arg"); | |
158 | if (i < 10) | |
159 | *(e++) = '0' + (char) i; | |
160 | else { | |
161 | *(e++) = '0' + (char) (i / 10); | |
162 | *(e++) = '0' + (char) (i % 10); | |
163 | } | |
164 | ||
165 | *e = 0; | |
166 | bloom_add_pair(data, size, n_hash, buf, t); | |
167 | ||
168 | strcpy(e, "-dot-prefix"); | |
169 | bloom_add_prefixes(data, size, n_hash, buf, t, '.'); | |
170 | strcpy(e, "-slash-prefix"); | |
171 | bloom_add_prefixes(data, size, n_hash, buf, t, '/'); | |
172 | } | |
173 | ||
eccd47c5 | 174 | static void add_bloom_arg_has(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) { |
19bee5c3 | 175 | char buf[sizeof("arg")-1 + 2 + sizeof("-has")]; |
eccd47c5 LP |
176 | char *e; |
177 | ||
178 | assert(data); | |
179 | assert(size > 0); | |
180 | assert(i < 64); | |
181 | assert(t); | |
182 | ||
183 | e = stpcpy(buf, "arg"); | |
184 | if (i < 10) | |
185 | *(e++) = '0' + (char) i; | |
186 | else { | |
187 | *(e++) = '0' + (char) (i / 10); | |
188 | *(e++) = '0' + (char) (i % 10); | |
189 | } | |
190 | ||
19bee5c3 | 191 | strcpy(e, "-has"); |
eccd47c5 LP |
192 | bloom_add_pair(data, size, n_hash, buf, t); |
193 | } | |
194 | ||
18a28147 KS |
195 | static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) { |
196 | void *data; | |
a56f19c4 LP |
197 | unsigned i; |
198 | int r; | |
199 | ||
200 | assert(m); | |
201 | assert(bloom); | |
202 | ||
18a28147 | 203 | data = bloom->data; |
29804cc1 | 204 | memzero(data, m->bus->bloom_size); |
18a28147 | 205 | bloom->generation = 0; |
a56f19c4 | 206 | |
b28ff39f | 207 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "message-type", bus_message_type_to_string(m->header->type)); |
a56f19c4 LP |
208 | |
209 | if (m->interface) | |
b28ff39f | 210 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface); |
a56f19c4 | 211 | if (m->member) |
b28ff39f | 212 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member); |
a56f19c4 | 213 | if (m->path) { |
b28ff39f LP |
214 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path); |
215 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path); | |
216 | bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/'); | |
a56f19c4 LP |
217 | } |
218 | ||
219 | r = sd_bus_message_rewind(m, true); | |
220 | if (r < 0) | |
221 | return r; | |
222 | ||
223 | for (i = 0; i < 64; i++) { | |
1abe54d9 | 224 | const char *t, *contents; |
a56f19c4 | 225 | char type; |
a56f19c4 | 226 | |
1abe54d9 | 227 | r = sd_bus_message_peek_type(m, &type, &contents); |
a56f19c4 LP |
228 | if (r < 0) |
229 | return r; | |
230 | ||
1abe54d9 | 231 | if (IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH, SD_BUS_TYPE_SIGNATURE)) { |
a56f19c4 | 232 | |
1abe54d9 LP |
233 | /* The bloom filter includes simple strings of any kind */ |
234 | r = sd_bus_message_read_basic(m, type, &t); | |
235 | if (r < 0) | |
236 | return r; | |
237 | ||
238 | add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t); | |
7d6884b6 TA |
239 | } |
240 | ||
241 | if (type == SD_BUS_TYPE_ARRAY && STR_IN_SET(contents, "s", "o", "g")) { | |
1abe54d9 LP |
242 | |
243 | /* As well as array of simple strings of any kinds */ | |
244 | r = sd_bus_message_enter_container(m, type, contents); | |
245 | if (r < 0) | |
246 | return r; | |
a56f19c4 | 247 | |
1abe54d9 | 248 | while ((r = sd_bus_message_read_basic(m, contents[0], &t)) > 0) |
eccd47c5 | 249 | add_bloom_arg_has(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t); |
1abe54d9 LP |
250 | if (r < 0) |
251 | return r; | |
252 | ||
253 | r = sd_bus_message_exit_container(m); | |
254 | if (r < 0) | |
255 | return r; | |
256 | ||
257 | } else | |
258 | /* Stop adding to bloom filter as soon as we | |
259 | * run into the first argument we cannot add | |
260 | * to it. */ | |
261 | break; | |
a56f19c4 LP |
262 | } |
263 | ||
264 | return 0; | |
b5baa8fe LP |
265 | } |
266 | ||
5b7d4c1c | 267 | static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { |
9b29bb68 | 268 | struct bus_body_part *part; |
febfd508 | 269 | struct kdbus_item *d; |
022fb855 | 270 | const char *destination; |
066ab03a ZJS |
271 | bool well_known = false; |
272 | uint64_t dst_id; | |
6629161f | 273 | size_t sz, dl; |
9b29bb68 | 274 | unsigned i; |
6629161f LP |
275 | int r; |
276 | ||
5b7d4c1c | 277 | assert(b); |
6629161f LP |
278 | assert(m); |
279 | assert(m->sealed); | |
e9a967f9 | 280 | |
069f5e61 LP |
281 | /* We put this together only once, if this message is reused |
282 | * we reuse the earlier-built version */ | |
e9a967f9 LP |
283 | if (m->kdbus) |
284 | return 0; | |
6629161f | 285 | |
022fb855 DM |
286 | destination = m->destination ?: m->destination_ptr; |
287 | ||
288 | if (destination) { | |
066ab03a | 289 | r = bus_kernel_parse_unique_name(destination, &dst_id); |
6629161f LP |
290 | if (r < 0) |
291 | return r; | |
066ab03a ZJS |
292 | if (r == 0) { |
293 | well_known = true; | |
294 | ||
295 | /* verify_destination_id will usually be 0, which makes the kernel | |
296 | * driver only look at the provided well-known name. Otherwise, | |
297 | * the kernel will make sure the provided destination id matches | |
298 | * the owner of the provided well-known-name, and fail if they | |
299 | * differ. Currently, this is only needed for bus-proxyd. */ | |
300 | dst_id = m->verify_destination_id; | |
301 | } | |
6629161f | 302 | } else |
066ab03a | 303 | dst_id = KDBUS_DST_ID_BROADCAST; |
6629161f | 304 | |
b1454bf0 | 305 | sz = offsetof(struct kdbus_msg, items); |
6629161f | 306 | |
69aec65c | 307 | /* Add in fixed header, fields header and payload */ |
77adde63 DH |
308 | sz += (1 + m->n_body_parts) * ALIGN8(offsetof(struct kdbus_item, vec) + |
309 | MAX(sizeof(struct kdbus_vec), | |
310 | sizeof(struct kdbus_memfd))); | |
6629161f | 311 | |
69aec65c | 312 | /* Add space for bloom filter */ |
18a28147 KS |
313 | sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) + |
314 | offsetof(struct kdbus_bloom_filter, data) + | |
b28ff39f | 315 | m->bus->bloom_size); |
b5baa8fe | 316 | |
6629161f LP |
317 | /* Add in well-known destination header */ |
318 | if (well_known) { | |
022fb855 | 319 | dl = strlen(destination); |
febfd508 | 320 | sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1); |
6629161f LP |
321 | } |
322 | ||
9097fe29 LP |
323 | /* Add space for unix fds */ |
324 | if (m->n_fds > 0) | |
febfd508 | 325 | sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds); |
9097fe29 | 326 | |
c556fe79 | 327 | m->kdbus = memalign(8, sz); |
66b26c5c LP |
328 | if (!m->kdbus) { |
329 | r = -ENOMEM; | |
330 | goto fail; | |
331 | } | |
6629161f | 332 | |
66b26c5c | 333 | m->free_kdbus = true; |
29804cc1 | 334 | memzero(m->kdbus, sz); |
d9115e18 | 335 | |
6629161f | 336 | m->kdbus->flags = |
94e15fdc | 337 | ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_EXPECT_REPLY) | |
d7d052b2 DM |
338 | ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_NO_AUTO_START : 0) | |
339 | ((m->header->type == SD_BUS_MESSAGE_SIGNAL) ? KDBUS_MSG_SIGNAL : 0); | |
022fb855 | 340 | |
066ab03a | 341 | m->kdbus->dst_id = dst_id; |
6647dc66 | 342 | m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; |
2ac7c17f | 343 | m->kdbus->cookie = m->header->dbus2.cookie; |
ca7b42c8 | 344 | m->kdbus->priority = m->priority; |
80a33f11 | 345 | |
7fa934b0 | 346 | if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) |
693eb9a2 | 347 | m->kdbus->cookie_reply = m->reply_cookie; |
7fa934b0 | 348 | else { |
03785ad0 DM |
349 | struct timespec now; |
350 | ||
b680a194 | 351 | assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0); |
03785ad0 DM |
352 | m->kdbus->timeout_ns = now.tv_sec * NSEC_PER_SEC + now.tv_nsec + |
353 | m->timeout * NSEC_PER_USEC; | |
354 | } | |
6629161f | 355 | |
b1454bf0 | 356 | d = m->kdbus->items; |
6629161f LP |
357 | |
358 | if (well_known) | |
022fb855 | 359 | append_destination(&d, destination, dl); |
6629161f | 360 | |
c91cb83c | 361 | append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
a392d361 LP |
362 | |
363 | MESSAGE_FOREACH_PART(part, i, m) { | |
364 | if (part->is_zero) { | |
66b26c5c LP |
365 | /* If this is padding then simply send a |
366 | * vector with a NULL data pointer which the | |
367 | * kernel will just pass through. This is the | |
368 | * most efficient way to encode zeroes */ | |
369 | ||
a392d361 LP |
370 | append_payload_vec(&d, NULL, part->size); |
371 | continue; | |
372 | } | |
373 | ||
022fb855 | 374 | if (part->memfd >= 0 && part->sealed && destination) { |
66b26c5c LP |
375 | /* Try to send a memfd, if the part is |
376 | * sealed and this is not a broadcast. Since we can only */ | |
a392d361 | 377 | |
77adde63 | 378 | append_payload_memfd(&d, part->memfd, part->memfd_offset, part->size); |
66b26c5c | 379 | continue; |
a392d361 LP |
380 | } |
381 | ||
73e231ab JE |
382 | /* Otherwise, let's send a vector to the actual data. |
383 | * For that, we need to map it first. */ | |
66b26c5c LP |
384 | r = bus_body_part_map(part); |
385 | if (r < 0) | |
386 | goto fail; | |
a392d361 | 387 | |
bc7fd8cd | 388 | append_payload_vec(&d, part->data, part->size); |
a392d361 | 389 | } |
6629161f | 390 | |
7ce98121 | 391 | if (m->header->type == SD_BUS_MESSAGE_SIGNAL) { |
18a28147 | 392 | struct kdbus_bloom_filter *bloom; |
5b7d4c1c | 393 | |
b28ff39f | 394 | bloom = append_bloom(&d, m->bus->bloom_size); |
18a28147 | 395 | r = bus_message_setup_bloom(m, bloom); |
a392d361 LP |
396 | if (r < 0) |
397 | goto fail; | |
5b7d4c1c | 398 | } |
b5baa8fe | 399 | |
9097fe29 LP |
400 | if (m->n_fds > 0) |
401 | append_fds(&d, m->fds, m->n_fds); | |
402 | ||
e9a967f9 | 403 | m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus; |
6629161f LP |
404 | assert(m->kdbus->size <= sz); |
405 | ||
406 | return 0; | |
a392d361 LP |
407 | |
408 | fail: | |
66b26c5c | 409 | m->poisoned = true; |
a392d361 | 410 | return r; |
6629161f LP |
411 | } |
412 | ||
125dd074 ZJS |
413 | static void unset_memfds(struct sd_bus_message *m) { |
414 | struct bus_body_part *part; | |
415 | unsigned i; | |
416 | ||
417 | assert(m); | |
418 | ||
419 | /* Make sure the memfds are not freed twice */ | |
420 | MESSAGE_FOREACH_PART(part, i, m) | |
421 | if (part->memfd >= 0) | |
422 | part->memfd = -1; | |
423 | } | |
424 | ||
76877fb9 LP |
425 | static void message_set_timestamp(sd_bus *bus, sd_bus_message *m, const struct kdbus_timestamp *ts) { |
426 | assert(bus); | |
427 | assert(m); | |
428 | ||
429 | if (!ts) | |
430 | return; | |
431 | ||
432 | if (!(bus->attach_flags & KDBUS_ATTACH_TIMESTAMP)) | |
433 | return; | |
434 | ||
435 | m->realtime = ts->realtime_ns / NSEC_PER_USEC; | |
436 | m->monotonic = ts->monotonic_ns / NSEC_PER_USEC; | |
437 | m->seqnum = ts->seqnum; | |
438 | } | |
439 | ||
cb67f718 DM |
440 | static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { |
441 | sd_bus_message *m = NULL; | |
442 | struct kdbus_item *d; | |
443 | unsigned n_fds = 0; | |
444 | _cleanup_free_ int *fds = NULL; | |
2ac7c17f LP |
445 | struct bus_header *header = NULL; |
446 | void *footer = NULL; | |
447 | size_t header_size = 0, footer_size = 0; | |
448 | size_t n_bytes = 0, idx = 0; | |
cb67f718 | 449 | const char *destination = NULL, *seclabel = NULL; |
2ac7c17f | 450 | bool last_was_memfd = false; |
6629161f LP |
451 | int r; |
452 | ||
cb67f718 DM |
453 | assert(bus); |
454 | assert(k); | |
455 | assert(k->payload_type == KDBUS_PAYLOAD_DBUS); | |
35460afc | 456 | |
cb67f718 DM |
457 | KDBUS_ITEM_FOREACH(d, k, items) { |
458 | size_t l; | |
f08838da | 459 | |
cb67f718 | 460 | l = d->size - offsetof(struct kdbus_item, data); |
8f155917 | 461 | |
cb67f718 | 462 | switch (d->type) { |
62b3e928 | 463 | |
cb67f718 | 464 | case KDBUS_ITEM_PAYLOAD_OFF: |
2ac7c17f LP |
465 | if (!header) { |
466 | header = (struct bus_header*)((uint8_t*) k + d->vec.offset); | |
467 | header_size = d->vec.size; | |
954871d8 | 468 | } |
b381de41 | 469 | |
2ac7c17f LP |
470 | footer = (uint8_t*) k + d->vec.offset; |
471 | footer_size = d->vec.size; | |
472 | ||
cb67f718 | 473 | n_bytes += d->vec.size; |
2ac7c17f | 474 | last_was_memfd = false; |
cb67f718 | 475 | break; |
8a0e0ed9 | 476 | |
cb67f718 | 477 | case KDBUS_ITEM_PAYLOAD_MEMFD: |
2ac7c17f | 478 | if (!header) /* memfd cannot be first part */ |
cb67f718 | 479 | return -EBADMSG; |
8a0e0ed9 | 480 | |
cb67f718 | 481 | n_bytes += d->memfd.size; |
2ac7c17f | 482 | last_was_memfd = true; |
cb67f718 | 483 | break; |
8a0e0ed9 | 484 | |
cb67f718 DM |
485 | case KDBUS_ITEM_FDS: { |
486 | int *f; | |
487 | unsigned j; | |
8a0e0ed9 | 488 | |
cb67f718 DM |
489 | j = l / sizeof(int); |
490 | f = realloc(fds, sizeof(int) * (n_fds + j)); | |
491 | if (!f) | |
492 | return -ENOMEM; | |
8a0e0ed9 | 493 | |
cb67f718 DM |
494 | fds = f; |
495 | memcpy(fds + n_fds, d->fds, sizeof(int) * j); | |
496 | n_fds += j; | |
497 | break; | |
498 | } | |
62b3e928 | 499 | |
cb67f718 DM |
500 | case KDBUS_ITEM_SECLABEL: |
501 | seclabel = d->str; | |
502 | break; | |
fd8d62d9 LP |
503 | } |
504 | } | |
505 | ||
2ac7c17f | 506 | if (last_was_memfd) /* memfd cannot be last part */ |
cb67f718 | 507 | return -EBADMSG; |
de297575 | 508 | |
2ac7c17f LP |
509 | if (!header) |
510 | return -EBADMSG; | |
219728b3 | 511 | |
2ac7c17f | 512 | if (header_size < sizeof(struct bus_header)) |
cb67f718 | 513 | return -EBADMSG; |
6629161f | 514 | |
cb67f718 DM |
515 | /* on kdbus we only speak native endian gvariant, never dbus1 |
516 | * marshalling or reverse endian */ | |
2ac7c17f LP |
517 | if (header->version != 2 || |
518 | header->endian != BUS_NATIVE_ENDIAN) | |
cb67f718 | 519 | return -EPROTOTYPE; |
c58dea19 | 520 | |
2ac7c17f LP |
521 | r = bus_message_from_header( |
522 | bus, | |
523 | header, header_size, | |
524 | footer, footer_size, | |
525 | n_bytes, | |
526 | fds, n_fds, | |
2ac7c17f | 527 | seclabel, 0, &m); |
cb67f718 DM |
528 | if (r < 0) |
529 | return r; | |
6629161f | 530 | |
cb67f718 DM |
531 | /* The well-known names list is different from the other |
532 | credentials. If we asked for it, but nothing is there, this | |
533 | means that the list of well-known names is simply empty, not | |
534 | that we lack any data */ | |
35460afc | 535 | |
cb67f718 | 536 | m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask; |
f08838da | 537 | |
cb67f718 DM |
538 | KDBUS_ITEM_FOREACH(d, k, items) { |
539 | size_t l; | |
6629161f | 540 | |
cb67f718 | 541 | l = d->size - offsetof(struct kdbus_item, data); |
6629161f | 542 | |
cb67f718 | 543 | switch (d->type) { |
6629161f | 544 | |
cb67f718 DM |
545 | case KDBUS_ITEM_PAYLOAD_OFF: { |
546 | size_t begin_body; | |
6629161f | 547 | |
cb67f718 | 548 | begin_body = BUS_MESSAGE_BODY_BEGIN(m); |
6629161f | 549 | |
cb67f718 DM |
550 | if (idx + d->vec.size > begin_body) { |
551 | struct bus_body_part *part; | |
a43b9ca3 | 552 | |
cb67f718 | 553 | /* Contains body material */ |
6629161f | 554 | |
cb67f718 DM |
555 | part = message_append_part(m); |
556 | if (!part) { | |
557 | r = -ENOMEM; | |
558 | goto fail; | |
559 | } | |
a43b9ca3 | 560 | |
cb67f718 DM |
561 | /* A -1 offset is NUL padding. */ |
562 | part->is_zero = d->vec.offset == ~0ULL; | |
a43b9ca3 | 563 | |
cb67f718 DM |
564 | if (idx >= begin_body) { |
565 | if (!part->is_zero) | |
2ac7c17f | 566 | part->data = (uint8_t* )k + d->vec.offset; |
cb67f718 DM |
567 | part->size = d->vec.size; |
568 | } else { | |
569 | if (!part->is_zero) | |
2ac7c17f | 570 | part->data = (uint8_t*) k + d->vec.offset + (begin_body - idx); |
cb67f718 DM |
571 | part->size = d->vec.size - (begin_body - idx); |
572 | } | |
a43b9ca3 | 573 | |
cb67f718 | 574 | part->sealed = true; |
ff4994c5 | 575 | } |
a43b9ca3 | 576 | |
cb67f718 DM |
577 | idx += d->vec.size; |
578 | break; | |
579 | } | |
a43b9ca3 | 580 | |
cb67f718 DM |
581 | case KDBUS_ITEM_PAYLOAD_MEMFD: { |
582 | struct bus_body_part *part; | |
a43b9ca3 | 583 | |
cb67f718 DM |
584 | if (idx < BUS_MESSAGE_BODY_BEGIN(m)) { |
585 | r = -EBADMSG; | |
586 | goto fail; | |
ff4994c5 | 587 | } |
a43b9ca3 | 588 | |
cb67f718 DM |
589 | part = message_append_part(m); |
590 | if (!part) { | |
591 | r = -ENOMEM; | |
592 | goto fail; | |
593 | } | |
a43b9ca3 | 594 | |
cb67f718 | 595 | part->memfd = d->memfd.fd; |
77adde63 | 596 | part->memfd_offset = d->memfd.start; |
cb67f718 DM |
597 | part->size = d->memfd.size; |
598 | part->sealed = true; | |
a43b9ca3 | 599 | |
cb67f718 DM |
600 | idx += d->memfd.size; |
601 | break; | |
602 | } | |
a43b9ca3 | 603 | |
705a415f LP |
604 | case KDBUS_ITEM_PIDS: |
605 | ||
32802361 | 606 | /* The PID/TID might be missing, when the data |
2ac7c17f LP |
607 | * is faked by a bus proxy and it lacks that |
608 | * information about the real client (since | |
609 | * SO_PEERCRED is used for that). Also kernel | |
610 | * namespacing might make some of this data | |
611 | * unavailable when untranslatable. */ | |
705a415f LP |
612 | |
613 | if (d->pids.pid > 0) { | |
614 | m->creds.pid = (pid_t) d->pids.pid; | |
615 | m->creds.mask |= SD_BUS_CREDS_PID & bus->creds_mask; | |
616 | } | |
617 | ||
705a415f LP |
618 | if (d->pids.tid > 0) { |
619 | m->creds.tid = (pid_t) d->pids.tid; | |
cb67f718 DM |
620 | m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask; |
621 | } | |
705a415f | 622 | |
1386e47d LP |
623 | if (d->pids.ppid > 0) { |
624 | m->creds.ppid = (pid_t) d->pids.ppid; | |
625 | m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask; | |
cfeaa44a LP |
626 | } else if (d->pids.pid == 1) { |
627 | m->creds.ppid = 0; | |
628 | m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask; | |
1386e47d LP |
629 | } |
630 | ||
705a415f LP |
631 | break; |
632 | ||
633 | case KDBUS_ITEM_CREDS: | |
634 | ||
2ac7c17f LP |
635 | /* EUID/SUID/FSUID/EGID/SGID/FSGID might be |
636 | * missing too (see above). */ | |
705a415f | 637 | |
fed1e721 | 638 | if ((uid_t) d->creds.uid != UID_INVALID) { |
705a415f LP |
639 | m->creds.uid = (uid_t) d->creds.uid; |
640 | m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask; | |
641 | } | |
642 | ||
fed1e721 | 643 | if ((uid_t) d->creds.euid != UID_INVALID) { |
705a415f LP |
644 | m->creds.euid = (uid_t) d->creds.euid; |
645 | m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask; | |
646 | } | |
647 | ||
fed1e721 | 648 | if ((uid_t) d->creds.suid != UID_INVALID) { |
705a415f LP |
649 | m->creds.suid = (uid_t) d->creds.suid; |
650 | m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask; | |
651 | } | |
652 | ||
fed1e721 | 653 | if ((uid_t) d->creds.fsuid != UID_INVALID) { |
705a415f LP |
654 | m->creds.fsuid = (uid_t) d->creds.fsuid; |
655 | m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask; | |
656 | } | |
657 | ||
fed1e721 | 658 | if ((gid_t) d->creds.gid != GID_INVALID) { |
705a415f LP |
659 | m->creds.gid = (gid_t) d->creds.gid; |
660 | m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask; | |
661 | } | |
662 | ||
fed1e721 | 663 | if ((gid_t) d->creds.egid != GID_INVALID) { |
705a415f LP |
664 | m->creds.egid = (gid_t) d->creds.egid; |
665 | m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask; | |
666 | } | |
667 | ||
fed1e721 | 668 | if ((gid_t) d->creds.sgid != GID_INVALID) { |
705a415f LP |
669 | m->creds.sgid = (gid_t) d->creds.sgid; |
670 | m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask; | |
671 | } | |
672 | ||
fed1e721 | 673 | if ((gid_t) d->creds.fsgid != GID_INVALID) { |
705a415f LP |
674 | m->creds.fsgid = (gid_t) d->creds.fsgid; |
675 | m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask; | |
676 | } | |
677 | ||
cb67f718 | 678 | break; |
6629161f | 679 | |
cb67f718 | 680 | case KDBUS_ITEM_TIMESTAMP: |
76877fb9 | 681 | message_set_timestamp(bus, m, &d->timestamp); |
cb67f718 | 682 | break; |
fd8d62d9 | 683 | |
cb67f718 DM |
684 | case KDBUS_ITEM_PID_COMM: |
685 | m->creds.comm = d->str; | |
686 | m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask; | |
687 | break; | |
fd8d62d9 | 688 | |
cb67f718 DM |
689 | case KDBUS_ITEM_TID_COMM: |
690 | m->creds.tid_comm = d->str; | |
691 | m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask; | |
692 | break; | |
6629161f | 693 | |
cb67f718 DM |
694 | case KDBUS_ITEM_EXE: |
695 | m->creds.exe = d->str; | |
696 | m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask; | |
697 | break; | |
6629161f | 698 | |
cb67f718 DM |
699 | case KDBUS_ITEM_CMDLINE: |
700 | m->creds.cmdline = d->str; | |
701 | m->creds.cmdline_size = l; | |
702 | m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask; | |
703 | break; | |
777d7a61 | 704 | |
cb67f718 DM |
705 | case KDBUS_ITEM_CGROUP: |
706 | m->creds.cgroup = d->str; | |
707 | 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 | 708 | |
fe3f22d1 DK |
709 | r = bus_get_root_path(bus); |
710 | if (r < 0) | |
711 | goto fail; | |
777d7a61 | 712 | |
cb67f718 | 713 | m->creds.cgroup_root = bus->cgroup_root; |
cb67f718 | 714 | break; |
777d7a61 | 715 | |
cb67f718 | 716 | case KDBUS_ITEM_AUDIT: |
cfeaa44a LP |
717 | m->creds.audit_session_id = (uint32_t) d->audit.sessionid; |
718 | m->creds.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask; | |
6dfcc64b | 719 | |
cfeaa44a LP |
720 | m->creds.audit_login_uid = (uid_t) d->audit.loginuid; |
721 | m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask; | |
cb67f718 | 722 | break; |
777d7a61 | 723 | |
cb67f718 | 724 | case KDBUS_ITEM_CAPS: |
34a5d5e5 DH |
725 | if (d->caps.last_cap != cap_last_cap() || |
726 | d->size - offsetof(struct kdbus_item, caps.caps) < DIV_ROUND_UP(d->caps.last_cap, 32U) * 4 * 4) { | |
727 | r = -EBADMSG; | |
728 | goto fail; | |
729 | } | |
730 | ||
7d9fcc2b | 731 | m->creds.capability = d->caps.caps; |
cb67f718 DM |
732 | 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; |
733 | break; | |
219728b3 | 734 | |
cb67f718 | 735 | case KDBUS_ITEM_DST_NAME: |
9f6dfd06 LP |
736 | if (!service_name_is_valid(d->str)) { |
737 | r = -EBADMSG; | |
738 | goto fail; | |
739 | } | |
219728b3 | 740 | |
cb67f718 DM |
741 | destination = d->str; |
742 | break; | |
777d7a61 | 743 | |
635f9f0d | 744 | case KDBUS_ITEM_OWNED_NAME: |
9f6dfd06 LP |
745 | if (!service_name_is_valid(d->name.name)) { |
746 | r = -EBADMSG; | |
cb67f718 | 747 | goto fail; |
9f6dfd06 LP |
748 | } |
749 | ||
750 | if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) { | |
50c45216 LP |
751 | char **wkn; |
752 | size_t n; | |
753 | ||
754 | /* We just extend the array here, but | |
755 | * do not allocate the strings inside | |
756 | * of it, instead we just point to our | |
757 | * buffer directly. */ | |
758 | n = strv_length(m->creds.well_known_names); | |
759 | wkn = realloc(m->creds.well_known_names, (n + 2) * sizeof(char*)); | |
760 | if (!wkn) { | |
761 | r = -ENOMEM; | |
9f6dfd06 | 762 | goto fail; |
50c45216 LP |
763 | } |
764 | ||
765 | wkn[n] = d->name.name; | |
766 | wkn[n+1] = NULL; | |
767 | m->creds.well_known_names = wkn; | |
9f6dfd06 LP |
768 | |
769 | m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES; | |
770 | } | |
cb67f718 | 771 | break; |
777d7a61 | 772 | |
635f9f0d | 773 | case KDBUS_ITEM_CONN_DESCRIPTION: |
455971c1 LP |
774 | m->creds.description = d->str; |
775 | m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask; | |
cccb0b2c LP |
776 | break; |
777 | ||
02581590 LP |
778 | case KDBUS_ITEM_AUXGROUPS: |
779 | ||
780 | if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) { | |
606303a9 DM |
781 | size_t i, n; |
782 | gid_t *g; | |
02581590 | 783 | |
606303a9 DM |
784 | n = (d->size - offsetof(struct kdbus_item, data64)) / sizeof(uint64_t); |
785 | g = new(gid_t, n); | |
786 | if (!g) { | |
787 | r = -ENOMEM; | |
788 | goto fail; | |
789 | } | |
790 | ||
791 | for (i = 0; i < n; i++) | |
792 | g[i] = d->data64[i]; | |
793 | ||
794 | m->creds.supplementary_gids = g; | |
795 | m->creds.n_supplementary_gids = n; | |
02581590 LP |
796 | m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS; |
797 | } | |
798 | ||
799 | break; | |
800 | ||
cb67f718 DM |
801 | case KDBUS_ITEM_FDS: |
802 | case KDBUS_ITEM_SECLABEL: | |
3f624df6 | 803 | case KDBUS_ITEM_BLOOM_FILTER: |
cb67f718 | 804 | break; |
d78bf250 | 805 | |
cb67f718 DM |
806 | default: |
807 | log_debug("Got unknown field from kernel %llu", d->type); | |
808 | } | |
809 | } | |
d78bf250 | 810 | |
38ce47e2 LP |
811 | /* If we requested the list of well-known names to be appended |
812 | * and the sender had none no item for it will be | |
315a73d9 | 813 | * attached. However, this does *not* mean that the kernel |
38ce47e2 LP |
814 | * didn't want to provide this information to us. Hence, let's |
815 | * explicitly mark this information as available if it was | |
816 | * requested. */ | |
817 | m->creds.mask |= bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES; | |
818 | ||
cb67f718 DM |
819 | r = bus_message_parse_fields(m); |
820 | if (r < 0) | |
821 | goto fail; | |
777d7a61 | 822 | |
7fa934b0 | 823 | /* Refuse messages if kdbus and dbus1 cookie doesn't match up */ |
2ac7c17f | 824 | if ((uint64_t) m->header->dbus2.cookie != k->cookie) { |
7fa934b0 LP |
825 | r = -EBADMSG; |
826 | goto fail; | |
827 | } | |
828 | ||
829 | /* Refuse messages where the reply flag doesn't match up */ | |
94e15fdc | 830 | if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) { |
7fa934b0 LP |
831 | r = -EBADMSG; |
832 | goto fail; | |
833 | } | |
834 | ||
835 | /* Refuse reply messages where the reply cookie doesn't match up */ | |
836 | if ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) && m->reply_cookie != k->cookie_reply) { | |
837 | r = -EBADMSG; | |
838 | goto fail; | |
839 | } | |
840 | ||
841 | /* Refuse messages where the autostart flag doesn't match up */ | |
94e15fdc | 842 | if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) { |
7fa934b0 LP |
843 | r = -EBADMSG; |
844 | goto fail; | |
845 | } | |
846 | ||
cb67f718 | 847 | /* Override information from the user header with data from the kernel */ |
7d31d924 LP |
848 | if (k->src_id == KDBUS_SRC_ID_KERNEL) |
849 | bus_message_set_sender_driver(bus, m); | |
850 | else { | |
d054f0a4 DM |
851 | xsprintf(m->sender_buffer, ":1.%llu", |
852 | (unsigned long long)k->src_id); | |
cb67f718 DM |
853 | m->sender = m->creds.unique_name = m->sender_buffer; |
854 | } | |
777d7a61 | 855 | |
cb67f718 DM |
856 | if (destination) |
857 | m->destination = destination; | |
858 | else if (k->dst_id == KDBUS_DST_ID_BROADCAST) | |
859 | m->destination = NULL; | |
860 | else if (k->dst_id == KDBUS_DST_ID_NAME) | |
861 | m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */ | |
862 | else { | |
d054f0a4 DM |
863 | xsprintf(m->destination_buffer, ":1.%llu", |
864 | (unsigned long long)k->dst_id); | |
cb67f718 DM |
865 | m->destination = m->destination_buffer; |
866 | } | |
777d7a61 | 867 | |
cb67f718 DM |
868 | /* We take possession of the kmsg struct now */ |
869 | m->kdbus = k; | |
870 | m->release_kdbus = true; | |
871 | m->free_fds = true; | |
872 | fds = NULL; | |
777d7a61 | 873 | |
cb67f718 | 874 | bus->rqueue[bus->rqueue_size++] = m; |
777d7a61 | 875 | |
cb67f718 | 876 | return 1; |
777d7a61 | 877 | |
cb67f718 | 878 | fail: |
125dd074 ZJS |
879 | unset_memfds(m); |
880 | sd_bus_message_unref(m); | |
777d7a61 | 881 | |
cb67f718 DM |
882 | return r; |
883 | } | |
777d7a61 | 884 | |
cb67f718 | 885 | int bus_kernel_take_fd(sd_bus *b) { |
d31f486b | 886 | struct kdbus_bloom_parameter *bloom = NULL; |
6ad4a4fc | 887 | struct kdbus_item *items, *item; |
cb67f718 | 888 | struct kdbus_cmd_hello *hello; |
5972fe95 LP |
889 | _cleanup_free_ char *g = NULL; |
890 | const char *name; | |
891 | size_t l = 0, m = 0, sz; | |
cb67f718 | 892 | int r; |
777d7a61 | 893 | |
cb67f718 | 894 | assert(b); |
7adc46fc | 895 | |
cb67f718 DM |
896 | if (b->is_server) |
897 | return -EINVAL; | |
777d7a61 | 898 | |
cb67f718 | 899 | b->use_memfd = 1; |
777d7a61 | 900 | |
455971c1 LP |
901 | if (b->description) { |
902 | g = bus_label_escape(b->description); | |
5972fe95 LP |
903 | if (!g) |
904 | return -ENOMEM; | |
905 | ||
906 | name = g; | |
907 | } else { | |
908 | char pr[17] = {}; | |
909 | ||
910 | /* If no name is explicitly set, we'll include a hint | |
911 | * indicating the library implementation, a hint which | |
912 | * kind of bus this is and the thread name */ | |
913 | ||
914 | assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0); | |
915 | ||
916 | if (isempty(pr)) { | |
917 | name = b->is_system ? "sd-system" : | |
918 | b->is_user ? "sd-user" : "sd"; | |
919 | } else { | |
920 | _cleanup_free_ char *e = NULL; | |
921 | ||
a6278b88 | 922 | e = bus_label_escape(pr); |
5972fe95 LP |
923 | if (!e) |
924 | return -ENOMEM; | |
925 | ||
926 | g = strappend(b->is_system ? "sd-system-" : | |
927 | b->is_user ? "sd-user-" : "sd-", | |
928 | e); | |
929 | if (!g) | |
930 | return -ENOMEM; | |
931 | ||
932 | name = g; | |
933 | } | |
934 | ||
455971c1 LP |
935 | b->description = bus_label_unescape(name); |
936 | if (!b->description) | |
5972fe95 LP |
937 | return -ENOMEM; |
938 | } | |
939 | ||
940 | m = strlen(name); | |
941 | ||
942 | sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) + | |
943 | ALIGN8(offsetof(struct kdbus_item, str) + m + 1); | |
777d7a61 | 944 | |
cb67f718 | 945 | if (b->fake_creds_valid) |
5972fe95 | 946 | sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds)); |
777d7a61 | 947 | |
705a415f LP |
948 | if (b->fake_pids_valid) |
949 | sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids)); | |
950 | ||
cb67f718 DM |
951 | if (b->fake_label) { |
952 | l = strlen(b->fake_label); | |
953 | sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1); | |
954 | } | |
777d7a61 | 955 | |
7f3d3ba1 | 956 | hello = alloca0_align(sz, 8); |
cb67f718 | 957 | hello->size = sz; |
bc75205c | 958 | hello->flags = b->hello_flags; |
6f5c810a | 959 | hello->attach_flags_send = _KDBUS_ATTACH_ANY; |
d704fda9 | 960 | hello->attach_flags_recv = b->attach_flags; |
cb67f718 | 961 | hello->pool_size = KDBUS_POOL_SIZE; |
777d7a61 | 962 | |
cb67f718 DM |
963 | item = hello->items; |
964 | ||
5972fe95 | 965 | item->size = offsetof(struct kdbus_item, str) + m + 1; |
635f9f0d | 966 | item->type = KDBUS_ITEM_CONN_DESCRIPTION; |
5972fe95 LP |
967 | memcpy(item->str, name, m + 1); |
968 | item = KDBUS_ITEM_NEXT(item); | |
969 | ||
cb67f718 DM |
970 | if (b->fake_creds_valid) { |
971 | item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds); | |
972 | item->type = KDBUS_ITEM_CREDS; | |
973 | item->creds = b->fake_creds; | |
974 | ||
975 | item = KDBUS_ITEM_NEXT(item); | |
777d7a61 LP |
976 | } |
977 | ||
705a415f LP |
978 | if (b->fake_pids_valid) { |
979 | item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids); | |
980 | item->type = KDBUS_ITEM_PIDS; | |
981 | item->pids = b->fake_pids; | |
982 | ||
983 | item = KDBUS_ITEM_NEXT(item); | |
984 | } | |
985 | ||
cb67f718 DM |
986 | if (b->fake_label) { |
987 | item->size = offsetof(struct kdbus_item, str) + l + 1; | |
5972fe95 | 988 | item->type = KDBUS_ITEM_SECLABEL; |
cb67f718 | 989 | memcpy(item->str, b->fake_label, l+1); |
777d7a61 LP |
990 | } |
991 | ||
cb67f718 | 992 | r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello); |
524d896a LP |
993 | if (r < 0) { |
994 | if (errno == ENOTTY) | |
995 | /* If the ioctl is not supported we assume that the | |
996 | * API version changed in a major incompatible way, | |
997 | * let's indicate an API incompatibility in this | |
998 | * case. */ | |
999 | return -ESOCKTNOSUPPORT; | |
1000 | ||
cb67f718 | 1001 | return -errno; |
524d896a | 1002 | } |
777d7a61 | 1003 | |
cb67f718 DM |
1004 | if (!b->kdbus_buffer) { |
1005 | b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0); | |
1006 | if (b->kdbus_buffer == MAP_FAILED) { | |
1007 | b->kdbus_buffer = NULL; | |
d31f486b DH |
1008 | r = -errno; |
1009 | goto fail; | |
cb67f718 DM |
1010 | } |
1011 | } | |
6629161f | 1012 | |
4a3e79e1 | 1013 | /* The higher 32bit of the bus_flags fields are considered |
cb67f718 | 1014 | * 'incompatible flags'. Refuse them all for now. */ |
d31f486b | 1015 | if (hello->bus_flags > 0xFFFFFFFFULL) { |
524d896a | 1016 | r = -ESOCKTNOSUPPORT; |
d31f486b DH |
1017 | goto fail; |
1018 | } | |
6629161f | 1019 | |
d31f486b DH |
1020 | /* extract bloom parameters from items */ |
1021 | items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset); | |
6ad4a4fc | 1022 | KDBUS_FOREACH(item, items, hello->items_size) { |
d31f486b DH |
1023 | switch (item->type) { |
1024 | case KDBUS_ITEM_BLOOM_PARAMETER: | |
1025 | bloom = &item->bloom_parameter; | |
1026 | break; | |
1027 | } | |
1028 | } | |
6629161f | 1029 | |
d31f486b | 1030 | if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) { |
15411c0c | 1031 | r = -EOPNOTSUPP; |
d31f486b DH |
1032 | goto fail; |
1033 | } | |
b28ff39f | 1034 | |
d31f486b DH |
1035 | b->bloom_size = (size_t) bloom->size; |
1036 | b->bloom_n_hash = (unsigned) bloom->n_hash; | |
1037 | ||
1038 | if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) { | |
1039 | r = -ENOMEM; | |
1040 | goto fail; | |
1041 | } | |
6629161f | 1042 | |
cb67f718 | 1043 | b->unique_id = hello->id; |
6629161f | 1044 | |
cb67f718 DM |
1045 | b->is_kernel = true; |
1046 | b->bus_client = true; | |
bc75205c | 1047 | b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD); |
cb67f718 DM |
1048 | b->message_version = 2; |
1049 | b->message_endian = BUS_NATIVE_ENDIAN; | |
c91cb83c | 1050 | |
cb67f718 DM |
1051 | /* the kernel told us the UUID of the underlying bus */ |
1052 | memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes)); | |
6629161f | 1053 | |
d31f486b DH |
1054 | /* free returned items */ |
1055 | (void) bus_kernel_cmd_free(b, hello->offset); | |
cb67f718 | 1056 | return bus_start_running(b); |
d31f486b DH |
1057 | |
1058 | fail: | |
72e61104 | 1059 | (void) bus_kernel_cmd_free(b, hello->offset); |
d31f486b | 1060 | return r; |
cb67f718 | 1061 | } |
6629161f | 1062 | |
cb67f718 DM |
1063 | int bus_kernel_connect(sd_bus *b) { |
1064 | assert(b); | |
1065 | assert(b->input_fd < 0); | |
1066 | assert(b->output_fd < 0); | |
1067 | assert(b->kernel); | |
1307c3ff | 1068 | |
cb67f718 DM |
1069 | if (b->is_server) |
1070 | return -EINVAL; | |
1307c3ff | 1071 | |
cb67f718 DM |
1072 | b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC); |
1073 | if (b->input_fd < 0) | |
1074 | return -errno; | |
6629161f | 1075 | |
cb67f718 | 1076 | b->output_fd = b->input_fd; |
6629161f | 1077 | |
cb67f718 DM |
1078 | return bus_kernel_take_fd(b); |
1079 | } | |
f9be01f3 | 1080 | |
52cfc037 LP |
1081 | int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) { |
1082 | struct kdbus_cmd_free cmd = { | |
d31f486b | 1083 | .size = sizeof(cmd), |
52cfc037 LP |
1084 | .offset = offset, |
1085 | }; | |
1086 | int r; | |
1087 | ||
1088 | assert(bus); | |
1089 | assert(bus->is_kernel); | |
1090 | ||
1091 | r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd); | |
1092 | if (r < 0) | |
1093 | return -errno; | |
1094 | ||
1095 | return 0; | |
1096 | } | |
1097 | ||
069f5e61 | 1098 | static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { |
069f5e61 LP |
1099 | struct kdbus_item *d; |
1100 | ||
1101 | assert(bus); | |
1102 | assert(k); | |
1103 | ||
069f5e61 | 1104 | KDBUS_ITEM_FOREACH(d, k, items) { |
069f5e61 LP |
1105 | if (d->type == KDBUS_ITEM_FDS) |
1106 | close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int)); | |
1107 | else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD) | |
03e334a1 | 1108 | safe_close(d->memfd.fd); |
069f5e61 | 1109 | } |
ca794c8e | 1110 | |
52cfc037 | 1111 | bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer); |
069f5e61 LP |
1112 | } |
1113 | ||
1114 | int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) { | |
94e15fdc | 1115 | struct kdbus_cmd_send cmd = { }; |
cb67f718 | 1116 | int r; |
6629161f | 1117 | |
cb67f718 DM |
1118 | assert(bus); |
1119 | assert(m); | |
1120 | assert(bus->state == BUS_RUNNING); | |
6629161f | 1121 | |
cb67f718 DM |
1122 | /* If we can't deliver, we want room for the error message */ |
1123 | r = bus_rqueue_make_room(bus); | |
6629161f LP |
1124 | if (r < 0) |
1125 | return r; | |
1126 | ||
cb67f718 | 1127 | r = bus_message_setup_kmsg(bus, m); |
6629161f LP |
1128 | if (r < 0) |
1129 | return r; | |
1130 | ||
94e15fdc DH |
1131 | cmd.size = sizeof(cmd); |
1132 | cmd.msg_address = (uintptr_t)m->kdbus; | |
1133 | ||
069f5e61 LP |
1134 | /* If this is a synchronous method call, then let's tell the |
1135 | * kernel, so that it can pass CPU time/scheduling to the | |
1136 | * destination for the time, if it wants to. If we | |
1137 | * synchronously wait for the result anyway, we won't need CPU | |
1138 | * anyway. */ | |
94e15fdc DH |
1139 | if (hint_sync_call) { |
1140 | m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY; | |
1141 | cmd.flags |= KDBUS_SEND_SYNC_REPLY; | |
1142 | } | |
069f5e61 | 1143 | |
94e15fdc | 1144 | r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd); |
cb67f718 | 1145 | if (r < 0) { |
4afd3348 | 1146 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; |
cb67f718 | 1147 | sd_bus_message *reply; |
253ce82b | 1148 | |
cb67f718 DM |
1149 | if (errno == EAGAIN || errno == EINTR) |
1150 | return 0; | |
1151 | else if (errno == ENXIO || errno == ESRCH) { | |
6629161f | 1152 | |
cb67f718 DM |
1153 | /* ENXIO: unique name not known |
1154 | * ESRCH: well-known name not known */ | |
6629161f | 1155 | |
cb67f718 DM |
1156 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
1157 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination); | |
1158 | else { | |
1159 | log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination); | |
1160 | return 0; | |
1161 | } | |
777d7a61 | 1162 | |
cb67f718 | 1163 | } else if (errno == EADDRNOTAVAIL) { |
fd8d62d9 | 1164 | |
cb67f718 | 1165 | /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */ |
bc7fd8cd | 1166 | |
cb67f718 DM |
1167 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
1168 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination); | |
1169 | else { | |
1170 | log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination); | |
1171 | return 0; | |
1172 | } | |
1173 | } else | |
1174 | return -errno; | |
bc7fd8cd | 1175 | |
cb67f718 DM |
1176 | r = bus_message_new_synthetic_error( |
1177 | bus, | |
1178 | BUS_MESSAGE_COOKIE(m), | |
1179 | &error, | |
1180 | &reply); | |
bc7fd8cd | 1181 | |
cb67f718 DM |
1182 | if (r < 0) |
1183 | return r; | |
bc7fd8cd | 1184 | |
cb67f718 DM |
1185 | r = bus_seal_synthetic_message(bus, reply); |
1186 | if (r < 0) | |
1187 | return r; | |
62b3e928 | 1188 | |
cb67f718 | 1189 | bus->rqueue[bus->rqueue_size++] = reply; |
bc7fd8cd | 1190 | |
069f5e61 LP |
1191 | } else if (hint_sync_call) { |
1192 | struct kdbus_msg *k; | |
fd8d62d9 | 1193 | |
94e15fdc | 1194 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset); |
069f5e61 | 1195 | assert(k); |
777d7a61 | 1196 | |
069f5e61 | 1197 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
1307c3ff | 1198 | |
069f5e61 LP |
1199 | r = bus_kernel_make_message(bus, k); |
1200 | if (r < 0) { | |
1201 | close_kdbus_msg(bus, k); | |
1307c3ff | 1202 | |
069f5e61 LP |
1203 | /* Anybody can send us invalid messages, let's just drop them. */ |
1204 | if (r == -EBADMSG || r == -EPROTOTYPE) | |
b267a6d2 | 1205 | log_debug_errno(r, "Ignoring invalid synchronous reply: %m"); |
069f5e61 LP |
1206 | else |
1207 | return r; | |
1208 | } | |
1209 | } else { | |
1210 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
1211 | close_kdbus_msg(bus, k); | |
1212 | } | |
cb67f718 | 1213 | } |
069f5e61 LP |
1214 | |
1215 | return 1; | |
cb67f718 | 1216 | } |
69aec65c | 1217 | |
76877fb9 LP |
1218 | static int push_name_owner_changed( |
1219 | sd_bus *bus, | |
1220 | const char *name, | |
1221 | const char *old_owner, | |
1222 | const char *new_owner, | |
1223 | const struct kdbus_timestamp *ts) { | |
1224 | ||
4afd3348 | 1225 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL; |
cb67f718 | 1226 | int r; |
2dc9970b | 1227 | |
cb67f718 | 1228 | assert(bus); |
2dc9970b | 1229 | |
cb67f718 DM |
1230 | r = sd_bus_message_new_signal( |
1231 | bus, | |
151b9b96 | 1232 | &m, |
cb67f718 DM |
1233 | "/org/freedesktop/DBus", |
1234 | "org.freedesktop.DBus", | |
151b9b96 | 1235 | "NameOwnerChanged"); |
cb67f718 DM |
1236 | if (r < 0) |
1237 | return r; | |
2dc9970b | 1238 | |
cb67f718 DM |
1239 | r = sd_bus_message_append(m, "sss", name, old_owner, new_owner); |
1240 | if (r < 0) | |
1241 | return r; | |
5b12334d | 1242 | |
7d31d924 | 1243 | bus_message_set_sender_driver(bus, m); |
76877fb9 | 1244 | message_set_timestamp(bus, m, ts); |
5b12334d | 1245 | |
cb67f718 DM |
1246 | r = bus_seal_synthetic_message(bus, m); |
1247 | if (r < 0) | |
1248 | return r; | |
5b12334d | 1249 | |
cb67f718 DM |
1250 | bus->rqueue[bus->rqueue_size++] = m; |
1251 | m = NULL; | |
5b12334d | 1252 | |
cb67f718 DM |
1253 | return 1; |
1254 | } | |
5b12334d | 1255 | |
76877fb9 LP |
1256 | static int translate_name_change( |
1257 | sd_bus *bus, | |
1258 | const struct kdbus_msg *k, | |
1259 | const struct kdbus_item *d, | |
1260 | const struct kdbus_timestamp *ts) { | |
1261 | ||
cb67f718 | 1262 | char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX]; |
5b12334d | 1263 | |
cb67f718 DM |
1264 | assert(bus); |
1265 | assert(k); | |
1266 | assert(d); | |
751bc6ac | 1267 | |
619d7a03 | 1268 | if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) |
cb67f718 DM |
1269 | old_owner[0] = 0; |
1270 | else | |
619d7a03 | 1271 | sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id); |
751bc6ac | 1272 | |
619d7a03 | 1273 | if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) { |
751bc6ac | 1274 | |
cb67f718 DM |
1275 | if (isempty(old_owner)) |
1276 | return 0; | |
5b12334d | 1277 | |
cb67f718 DM |
1278 | new_owner[0] = 0; |
1279 | } else | |
619d7a03 | 1280 | sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id); |
5b12334d | 1281 | |
76877fb9 | 1282 | return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner, ts); |
cb67f718 | 1283 | } |
5b12334d | 1284 | |
76877fb9 LP |
1285 | static int translate_id_change( |
1286 | sd_bus *bus, | |
1287 | const struct kdbus_msg *k, | |
1288 | const struct kdbus_item *d, | |
1289 | const struct kdbus_timestamp *ts) { | |
1290 | ||
cb67f718 | 1291 | char owner[UNIQUE_NAME_MAX]; |
2e2ec0ea | 1292 | |
cb67f718 DM |
1293 | assert(bus); |
1294 | assert(k); | |
1295 | assert(d); | |
777d7a61 | 1296 | |
cb67f718 | 1297 | sprintf(owner, ":1.%llu", d->id_change.id); |
2e2ec0ea | 1298 | |
cb67f718 DM |
1299 | return push_name_owner_changed( |
1300 | bus, owner, | |
1301 | d->type == KDBUS_ITEM_ID_ADD ? NULL : owner, | |
76877fb9 LP |
1302 | d->type == KDBUS_ITEM_ID_ADD ? owner : NULL, |
1303 | ts); | |
cb67f718 | 1304 | } |
49b832c5 | 1305 | |
76877fb9 LP |
1306 | static int translate_reply( |
1307 | sd_bus *bus, | |
1308 | const struct kdbus_msg *k, | |
1309 | const struct kdbus_item *d, | |
1310 | const struct kdbus_timestamp *ts) { | |
1311 | ||
4afd3348 | 1312 | _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL; |
cb67f718 | 1313 | int r; |
777d7a61 | 1314 | |
cb67f718 DM |
1315 | assert(bus); |
1316 | assert(k); | |
1317 | assert(d); | |
acb5a3cb | 1318 | |
cb67f718 DM |
1319 | r = bus_message_new_synthetic_error( |
1320 | bus, | |
1321 | k->cookie_reply, | |
1322 | d->type == KDBUS_ITEM_REPLY_TIMEOUT ? | |
1323 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") : | |
1324 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"), | |
1325 | &m); | |
1307c3ff | 1326 | if (r < 0) |
cb67f718 | 1327 | return r; |
51038c03 | 1328 | |
76877fb9 | 1329 | message_set_timestamp(bus, m, ts); |
51038c03 | 1330 | |
cb67f718 DM |
1331 | r = bus_seal_synthetic_message(bus, m); |
1332 | if (r < 0) | |
1333 | return r; | |
6629161f | 1334 | |
7adc46fc | 1335 | bus->rqueue[bus->rqueue_size++] = m; |
cb67f718 | 1336 | m = NULL; |
7d22c717 | 1337 | |
6629161f | 1338 | return 1; |
cb67f718 | 1339 | } |
1307c3ff | 1340 | |
cb67f718 | 1341 | static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) { |
76877fb9 | 1342 | static int (* const translate[])(sd_bus *bus, const struct kdbus_msg *k, const struct kdbus_item *d, const struct kdbus_timestamp *ts) = { |
cb67f718 DM |
1343 | [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, |
1344 | [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1345 | [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1307c3ff | 1346 | |
cb67f718 DM |
1347 | [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, |
1348 | [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, | |
1349 | ||
1350 | [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1351 | [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1352 | }; | |
1353 | ||
76877fb9 LP |
1354 | struct kdbus_item *d, *found = NULL; |
1355 | struct kdbus_timestamp *ts = NULL; | |
1356 | ||
cb67f718 DM |
1357 | assert(bus); |
1358 | assert(k); | |
1359 | assert(k->payload_type == KDBUS_PAYLOAD_KERNEL); | |
1360 | ||
1361 | KDBUS_ITEM_FOREACH(d, k, items) { | |
856d6e09 | 1362 | if (d->type == KDBUS_ITEM_TIMESTAMP) |
76877fb9 | 1363 | ts = &d->timestamp; |
95cdf5e3 | 1364 | else if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) { |
cb67f718 DM |
1365 | if (found) |
1366 | return -EBADMSG; | |
1367 | found = d; | |
1368 | } else | |
1369 | log_debug("Got unknown field from kernel %llu", d->type); | |
1307c3ff LP |
1370 | } |
1371 | ||
cb67f718 DM |
1372 | if (!found) { |
1373 | log_debug("Didn't find a kernel message to translate."); | |
1374 | return 0; | |
1375 | } | |
1376 | ||
76877fb9 | 1377 | return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found, ts); |
6629161f LP |
1378 | } |
1379 | ||
766c5809 | 1380 | int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) { |
94e15fdc | 1381 | struct kdbus_cmd_recv recv = { .size = sizeof(recv) }; |
6629161f | 1382 | struct kdbus_msg *k; |
6629161f LP |
1383 | int r; |
1384 | ||
1385 | assert(bus); | |
7d22c717 | 1386 | |
7adc46fc | 1387 | r = bus_rqueue_make_room(bus); |
7d22c717 LP |
1388 | if (r < 0) |
1389 | return r; | |
6629161f | 1390 | |
766c5809 LP |
1391 | if (hint_priority) { |
1392 | recv.flags |= KDBUS_RECV_USE_PRIORITY; | |
1393 | recv.priority = priority; | |
1394 | } | |
1395 | ||
94e15fdc | 1396 | r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv); |
83e30358 DH |
1397 | if (recv.return_flags & KDBUS_RECV_RETURN_DROPPED_MSGS) |
1398 | log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs); | |
fd8d62d9 | 1399 | if (r < 0) { |
6629161f LP |
1400 | if (errno == EAGAIN) |
1401 | return 0; | |
1402 | ||
fd8d62d9 | 1403 | return -errno; |
6629161f LP |
1404 | } |
1405 | ||
a9c8343e | 1406 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.msg.offset); |
e1d337d4 | 1407 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
7d22c717 | 1408 | r = bus_kernel_make_message(bus, k); |
e1d337d4 LP |
1409 | |
1410 | /* Anybody can send us invalid messages, let's just drop them. */ | |
1411 | if (r == -EBADMSG || r == -EPROTOTYPE) { | |
da927ba9 | 1412 | log_debug_errno(r, "Ignoring invalid message: %m"); |
e1d337d4 LP |
1413 | r = 0; |
1414 | } | |
1415 | ||
0c9cc10d DH |
1416 | if (r <= 0) |
1417 | close_kdbus_msg(bus, k); | |
1418 | } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) { | |
7d22c717 | 1419 | r = bus_kernel_translate_message(bus, k); |
0c9cc10d DH |
1420 | close_kdbus_msg(bus, k); |
1421 | } else { | |
069f5e61 | 1422 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); |
777d7a61 | 1423 | r = 0; |
fd8d62d9 | 1424 | close_kdbus_msg(bus, k); |
0c9cc10d | 1425 | } |
6629161f | 1426 | |
51038c03 | 1427 | return r < 0 ? r : 1; |
6629161f LP |
1428 | } |
1429 | ||
8e959fbf | 1430 | int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) { |
bc7fd8cd | 1431 | struct memfd_cache *c; |
45fbe937 | 1432 | int fd; |
bc7fd8cd LP |
1433 | |
1434 | assert(address); | |
8e959fbf LP |
1435 | assert(mapped); |
1436 | assert(allocated); | |
35460afc LP |
1437 | |
1438 | if (!bus || !bus->is_kernel) | |
15411c0c | 1439 | return -EOPNOTSUPP; |
bc7fd8cd | 1440 | |
50e0d56c | 1441 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) == 0); |
45fbe937 | 1442 | |
bc7fd8cd | 1443 | if (bus->n_memfd_cache <= 0) { |
45fbe937 LP |
1444 | int r; |
1445 | ||
50e0d56c | 1446 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0); |
bc7fd8cd | 1447 | |
455971c1 | 1448 | r = memfd_new(bus->description); |
9b05bc48 | 1449 | if (r < 0) |
73843b52 | 1450 | return r; |
bc7fd8cd LP |
1451 | |
1452 | *address = NULL; | |
8e959fbf LP |
1453 | *mapped = 0; |
1454 | *allocated = 0; | |
a6082d77 | 1455 | return r; |
bc7fd8cd LP |
1456 | } |
1457 | ||
bf30e48f | 1458 | c = &bus->memfd_cache[--bus->n_memfd_cache]; |
bc7fd8cd LP |
1459 | |
1460 | assert(c->fd >= 0); | |
8e959fbf | 1461 | assert(c->mapped == 0 || c->address); |
bc7fd8cd LP |
1462 | |
1463 | *address = c->address; | |
8e959fbf LP |
1464 | *mapped = c->mapped; |
1465 | *allocated = c->allocated; | |
45fbe937 LP |
1466 | fd = c->fd; |
1467 | ||
50e0d56c | 1468 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0); |
bc7fd8cd | 1469 | |
45fbe937 LP |
1470 | return fd; |
1471 | } | |
1472 | ||
1473 | static void close_and_munmap(int fd, void *address, size_t size) { | |
1474 | if (size > 0) | |
76b7742c | 1475 | assert_se(munmap(address, PAGE_ALIGN(size)) >= 0); |
45fbe937 | 1476 | |
03e334a1 | 1477 | safe_close(fd); |
bc7fd8cd LP |
1478 | } |
1479 | ||
8e959fbf | 1480 | void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) { |
bc7fd8cd | 1481 | struct memfd_cache *c; |
8e959fbf | 1482 | uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX); |
bc7fd8cd LP |
1483 | |
1484 | assert(fd >= 0); | |
8e959fbf | 1485 | assert(mapped == 0 || address); |
bc7fd8cd | 1486 | |
45fbe937 | 1487 | if (!bus || !bus->is_kernel) { |
8e959fbf | 1488 | close_and_munmap(fd, address, mapped); |
45fbe937 LP |
1489 | return; |
1490 | } | |
1491 | ||
50e0d56c | 1492 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) == 0); |
bc7fd8cd | 1493 | |
45fbe937 | 1494 | if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) { |
50e0d56c | 1495 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0); |
bc7fd8cd | 1496 | |
8e959fbf | 1497 | close_and_munmap(fd, address, mapped); |
bc7fd8cd LP |
1498 | return; |
1499 | } | |
1500 | ||
1501 | c = &bus->memfd_cache[bus->n_memfd_cache++]; | |
1502 | c->fd = fd; | |
1503 | c->address = address; | |
1504 | ||
1505 | /* If overly long, let's return a bit to the OS */ | |
8e959fbf | 1506 | if (mapped > max_mapped) { |
73843b52 | 1507 | assert_se(memfd_set_size(fd, max_mapped) >= 0); |
8e959fbf LP |
1508 | assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0); |
1509 | c->mapped = c->allocated = max_mapped; | |
1510 | } else { | |
1511 | c->mapped = mapped; | |
1512 | c->allocated = allocated; | |
1513 | } | |
45fbe937 | 1514 | |
50e0d56c | 1515 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0); |
bc7fd8cd LP |
1516 | } |
1517 | ||
1518 | void bus_kernel_flush_memfd(sd_bus *b) { | |
1519 | unsigned i; | |
1520 | ||
1521 | assert(b); | |
1522 | ||
76b7742c | 1523 | for (i = 0; i < b->n_memfd_cache; i++) |
8e959fbf | 1524 | close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped); |
bc7fd8cd | 1525 | } |
0253ddcc | 1526 | |
b5dae4c7 | 1527 | uint64_t request_name_flags_to_kdbus(uint64_t flags) { |
e3dd987c | 1528 | uint64_t f = 0; |
0253ddcc | 1529 | |
e3dd987c LP |
1530 | if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT) |
1531 | f |= KDBUS_NAME_ALLOW_REPLACEMENT; | |
0253ddcc | 1532 | |
e3dd987c LP |
1533 | if (flags & SD_BUS_NAME_REPLACE_EXISTING) |
1534 | f |= KDBUS_NAME_REPLACE_EXISTING; | |
0253ddcc | 1535 | |
d90bb669 | 1536 | if (flags & SD_BUS_NAME_QUEUE) |
e3dd987c | 1537 | f |= KDBUS_NAME_QUEUE; |
0253ddcc | 1538 | |
b5dae4c7 | 1539 | return f; |
e3dd987c LP |
1540 | } |
1541 | ||
b5dae4c7 | 1542 | uint64_t attach_flags_to_kdbus(uint64_t mask) { |
e3dd987c LP |
1543 | uint64_t m = 0; |
1544 | ||
705a415f LP |
1545 | if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID| |
1546 | SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID)) | |
e3dd987c LP |
1547 | m |= KDBUS_ATTACH_CREDS; |
1548 | ||
1386e47d | 1549 | if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID|SD_BUS_CREDS_PPID)) |
705a415f LP |
1550 | m |= KDBUS_ATTACH_PIDS; |
1551 | ||
a2243d54 DM |
1552 | if (mask & SD_BUS_CREDS_COMM) |
1553 | m |= KDBUS_ATTACH_PID_COMM; | |
1554 | ||
1555 | if (mask & SD_BUS_CREDS_TID_COMM) | |
1556 | m |= KDBUS_ATTACH_TID_COMM; | |
e3dd987c LP |
1557 | |
1558 | if (mask & SD_BUS_CREDS_EXE) | |
1559 | m |= KDBUS_ATTACH_EXE; | |
1560 | ||
1561 | if (mask & SD_BUS_CREDS_CMDLINE) | |
1562 | m |= KDBUS_ATTACH_CMDLINE; | |
1563 | ||
1564 | 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)) | |
1565 | m |= KDBUS_ATTACH_CGROUP; | |
1566 | ||
1567 | if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) | |
1568 | m |= KDBUS_ATTACH_CAPS; | |
1569 | ||
1570 | if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) | |
1571 | m |= KDBUS_ATTACH_SECLABEL; | |
0253ddcc | 1572 | |
e3dd987c LP |
1573 | if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) |
1574 | m |= KDBUS_ATTACH_AUDIT; | |
1575 | ||
49b832c5 LP |
1576 | if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) |
1577 | m |= KDBUS_ATTACH_NAMES; | |
1578 | ||
455971c1 | 1579 | if (mask & SD_BUS_CREDS_DESCRIPTION) |
635f9f0d | 1580 | m |= KDBUS_ATTACH_CONN_DESCRIPTION; |
cccb0b2c | 1581 | |
02581590 LP |
1582 | if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) |
1583 | m |= KDBUS_ATTACH_AUXGROUPS; | |
1584 | ||
b5dae4c7 | 1585 | return m; |
0253ddcc | 1586 | } |
e3dd987c | 1587 | |
f2769777 | 1588 | int bus_kernel_create_bus(const char *name, bool world, char **s) { |
b2086f60 | 1589 | struct kdbus_cmd *make; |
e3dd987c | 1590 | struct kdbus_item *n; |
fa7796e9 | 1591 | size_t l; |
e3dd987c LP |
1592 | int fd; |
1593 | ||
1594 | assert(name); | |
1595 | assert(s); | |
1596 | ||
63cc4c31 | 1597 | fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); |
e3dd987c LP |
1598 | if (fd < 0) |
1599 | return -errno; | |
1600 | ||
fa7796e9 | 1601 | l = strlen(name); |
b2086f60 | 1602 | make = alloca0_align(offsetof(struct kdbus_cmd, items) + |
fa7796e9 LP |
1603 | ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) + |
1604 | ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) + | |
1605 | ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1), | |
7f3d3ba1 | 1606 | 8); |
e3dd987c | 1607 | |
b2086f60 | 1608 | make->size = offsetof(struct kdbus_cmd, items); |
816a3f9e | 1609 | |
fa7796e9 | 1610 | /* Set the bloom parameters */ |
e3dd987c | 1611 | n = make->items; |
18a28147 KS |
1612 | n->size = offsetof(struct kdbus_item, bloom_parameter) + |
1613 | sizeof(struct kdbus_bloom_parameter); | |
1614 | n->type = KDBUS_ITEM_BLOOM_PARAMETER; | |
b28ff39f LP |
1615 | n->bloom_parameter.size = DEFAULT_BLOOM_SIZE; |
1616 | n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH; | |
1617 | ||
1618 | assert_cc(DEFAULT_BLOOM_SIZE > 0); | |
1619 | assert_cc(DEFAULT_BLOOM_N_HASH > 0); | |
1620 | ||
816a3f9e DM |
1621 | make->size += ALIGN8(n->size); |
1622 | ||
19ee32dc DH |
1623 | /* Provide all metadata via bus-owner queries */ |
1624 | n = KDBUS_ITEM_NEXT(n); | |
1625 | n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND; | |
1626 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); | |
fa7796e9 LP |
1627 | n->data64[0] = _KDBUS_ATTACH_ANY; |
1628 | make->size += ALIGN8(n->size); | |
1629 | ||
1630 | /* Set the a good name */ | |
816a3f9e | 1631 | n = KDBUS_ITEM_NEXT(n); |
a4152e3f | 1632 | sprintf(n->str, UID_FMT "-%s", getuid(), name); |
e3dd987c | 1633 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; |
5e16c257 | 1634 | n->type = KDBUS_ITEM_MAKE_NAME; |
816a3f9e | 1635 | make->size += ALIGN8(n->size); |
e3dd987c | 1636 | |
f7c7cd03 | 1637 | make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0; |
e3dd987c LP |
1638 | |
1639 | if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { | |
03e334a1 | 1640 | safe_close(fd); |
524d896a LP |
1641 | |
1642 | /* Major API change? then the ioctls got shuffled around. */ | |
1643 | if (errno == ENOTTY) | |
1644 | return -ESOCKTNOSUPPORT; | |
1645 | ||
e3dd987c LP |
1646 | return -errno; |
1647 | } | |
1648 | ||
1649 | if (s) { | |
1650 | char *p; | |
1651 | ||
605405c6 | 1652 | p = strjoin("/sys/fs/kdbus/", n->str, "/bus"); |
e3dd987c | 1653 | if (!p) { |
03e334a1 | 1654 | safe_close(fd); |
e3dd987c LP |
1655 | return -ENOMEM; |
1656 | } | |
1657 | ||
1658 | *s = p; | |
1659 | } | |
1660 | ||
1661 | return fd; | |
1662 | } | |
9bd37b40 | 1663 | |
8f077bf9 | 1664 | int bus_kernel_open_bus_fd(const char *bus, char **path) { |
a4152e3f LP |
1665 | char *p; |
1666 | int fd; | |
8f077bf9 | 1667 | size_t len; |
1683342a | 1668 | |
8aee3fc7 LP |
1669 | assert(bus); |
1670 | ||
63cc4c31 | 1671 | len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1; |
8f077bf9 ZJS |
1672 | |
1673 | if (path) { | |
8aee3fc7 | 1674 | p = new(char, len); |
8f077bf9 ZJS |
1675 | if (!p) |
1676 | return -ENOMEM; | |
8f077bf9 | 1677 | } else |
8aee3fc7 LP |
1678 | p = newa(char, len); |
1679 | ||
63cc4c31 | 1680 | sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus); |
1683342a | 1681 | |
a4152e3f | 1682 | fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); |
8aee3fc7 LP |
1683 | if (fd < 0) { |
1684 | if (path) | |
1685 | free(p); | |
1686 | ||
a4152e3f | 1687 | return -errno; |
8aee3fc7 LP |
1688 | } |
1689 | ||
1690 | if (path) | |
1691 | *path = p; | |
a4152e3f LP |
1692 | |
1693 | return fd; | |
1683342a DM |
1694 | } |
1695 | ||
ae095f86 | 1696 | int bus_kernel_try_close(sd_bus *bus) { |
b2086f60 DH |
1697 | struct kdbus_cmd byebye = { .size = sizeof(byebye) }; |
1698 | ||
ae095f86 LP |
1699 | assert(bus); |
1700 | assert(bus->is_kernel); | |
1701 | ||
b2086f60 | 1702 | if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE, &byebye) < 0) |
ae095f86 LP |
1703 | return -errno; |
1704 | ||
1705 | return 0; | |
1706 | } | |
ff975efb LP |
1707 | |
1708 | int bus_kernel_drop_one(int fd) { | |
1709 | struct kdbus_cmd_recv recv = { | |
94e15fdc DH |
1710 | .size = sizeof(recv), |
1711 | .flags = KDBUS_RECV_DROP, | |
ff975efb LP |
1712 | }; |
1713 | ||
1714 | assert(fd >= 0); | |
1715 | ||
94e15fdc | 1716 | if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0) |
ff975efb LP |
1717 | return -errno; |
1718 | ||
1719 | return 0; | |
1720 | } | |
b5dae4c7 LP |
1721 | |
1722 | int bus_kernel_realize_attach_flags(sd_bus *bus) { | |
b2086f60 | 1723 | struct kdbus_cmd *update; |
b5dae4c7 LP |
1724 | struct kdbus_item *n; |
1725 | ||
1726 | assert(bus); | |
1727 | assert(bus->is_kernel); | |
1728 | ||
b2086f60 | 1729 | update = alloca0_align(offsetof(struct kdbus_cmd, items) + |
fa7796e9 LP |
1730 | ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)), |
1731 | 8); | |
b5dae4c7 LP |
1732 | |
1733 | n = update->items; | |
1734 | n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV; | |
1735 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); | |
1736 | n->data64[0] = bus->attach_flags; | |
1737 | ||
fa7796e9 | 1738 | update->size = |
b2086f60 | 1739 | offsetof(struct kdbus_cmd, items) + |
fa7796e9 | 1740 | ALIGN8(n->size); |
b5dae4c7 | 1741 | |
b2086f60 | 1742 | if (ioctl(bus->input_fd, KDBUS_CMD_UPDATE, update) < 0) |
b5dae4c7 LP |
1743 | return -errno; |
1744 | ||
1745 | return 0; | |
1746 | } | |
1a299299 | 1747 | |
3acc1daf LP |
1748 | int bus_kernel_get_bus_name(sd_bus *bus, char **name) { |
1749 | struct kdbus_cmd_info cmd = { | |
1750 | .size = sizeof(struct kdbus_cmd_info), | |
1751 | }; | |
1752 | struct kdbus_info *info; | |
1753 | struct kdbus_item *item; | |
1754 | char *n = NULL; | |
1755 | int r; | |
1756 | ||
1757 | assert(bus); | |
1758 | assert(name); | |
1759 | assert(bus->is_kernel); | |
1760 | ||
1761 | r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd); | |
1762 | if (r < 0) | |
1763 | return -errno; | |
1764 | ||
1765 | info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset); | |
1766 | ||
1767 | KDBUS_ITEM_FOREACH(item, info, items) | |
1768 | if (item->type == KDBUS_ITEM_MAKE_NAME) { | |
1769 | r = free_and_strdup(&n, item->str); | |
1770 | break; | |
1771 | } | |
1772 | ||
1773 | bus_kernel_cmd_free(bus, cmd.offset); | |
1774 | ||
1775 | if (r < 0) | |
1776 | return r; | |
1777 | if (!n) | |
1778 | return -EIO; | |
1779 | ||
1780 | *name = n; | |
1781 | return 0; | |
1782 | } |