]>
Commit | Line | Data |
---|---|---|
6629161f LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
7211f918 LP |
22 | #ifdef HAVE_VALGRIND_MEMCHECK_H |
23 | #include <valgrind/memcheck.h> | |
24 | #endif | |
25 | ||
6629161f | 26 | #include <fcntl.h> |
c556fe79 | 27 | #include <malloc.h> |
fd8d62d9 | 28 | #include <sys/mman.h> |
5972fe95 | 29 | #include <sys/prctl.h> |
6629161f | 30 | |
eef46c37 | 31 | /* When we include libgen.h because we need dirname() we immediately |
11c9f1e4 SM |
32 | * undefine basename() since libgen.h defines it as a macro to the POSIX |
33 | * version which is really broken. We prefer GNU basename(). */ | |
eef46c37 LP |
34 | #include <libgen.h> |
35 | #undef basename | |
36 | ||
07630cea LP |
37 | #include "bus-bloom.h" |
38 | #include "bus-internal.h" | |
3ffd4af2 | 39 | #include "bus-kernel.h" |
07630cea LP |
40 | #include "bus-label.h" |
41 | #include "bus-message.h" | |
42 | #include "bus-util.h" | |
430f0182 | 43 | #include "capability-util.h" |
3ffd4af2 | 44 | #include "fd-util.h" |
1a299299 | 45 | #include "fileio.h" |
6482f626 | 46 | #include "formats-util.h" |
07630cea | 47 | #include "memfd-util.h" |
6bedfcbb | 48 | #include "parse-util.h" |
07630cea LP |
49 | #include "string-util.h" |
50 | #include "strv.h" | |
51 | #include "util.h" | |
777d7a61 LP |
52 | |
53 | #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t)) | |
6629161f | 54 | |
c7819669 | 55 | int bus_kernel_parse_unique_name(const char *s, uint64_t *id) { |
6629161f LP |
56 | int r; |
57 | ||
58 | assert(s); | |
59 | assert(id); | |
60 | ||
61 | if (!startswith(s, ":1.")) | |
62 | return 0; | |
63 | ||
64 | r = safe_atou64(s + 3, id); | |
65 | if (r < 0) | |
66 | return r; | |
67 | ||
68 | return 1; | |
69 | } | |
70 | ||
febfd508 | 71 | static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) { |
6629161f | 72 | assert(d); |
6629161f LP |
73 | assert(sz > 0); |
74 | ||
e86b80b8 LP |
75 | *d = ALIGN8_PTR(*d); |
76 | ||
66b26c5c LP |
77 | /* Note that p can be NULL, which encodes a region full of |
78 | * zeroes, which is useful to optimize certain padding | |
79 | * conditions */ | |
80 | ||
febfd508 | 81 | (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec); |
ea1edece | 82 | (*d)->type = KDBUS_ITEM_PAYLOAD_VEC; |
a392d361 | 83 | (*d)->vec.address = PTR_TO_UINT64(p); |
6629161f LP |
84 | (*d)->vec.size = sz; |
85 | ||
febfd508 | 86 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
87 | } |
88 | ||
77adde63 | 89 | static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t start, size_t sz) { |
a392d361 LP |
90 | assert(d); |
91 | assert(memfd >= 0); | |
92 | assert(sz > 0); | |
93 | ||
94 | *d = ALIGN8_PTR(*d); | |
95 | (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd); | |
ea1edece | 96 | (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD; |
a392d361 | 97 | (*d)->memfd.fd = memfd; |
77adde63 | 98 | (*d)->memfd.start = start; |
a392d361 LP |
99 | (*d)->memfd.size = sz; |
100 | ||
101 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); | |
102 | } | |
103 | ||
febfd508 | 104 | static void append_destination(struct kdbus_item **d, const char *s, size_t length) { |
6629161f | 105 | assert(d); |
b5baa8fe | 106 | assert(s); |
6629161f | 107 | |
e86b80b8 LP |
108 | *d = ALIGN8_PTR(*d); |
109 | ||
febfd508 | 110 | (*d)->size = offsetof(struct kdbus_item, str) + length + 1; |
ea1edece | 111 | (*d)->type = KDBUS_ITEM_DST_NAME; |
51038c03 | 112 | memcpy((*d)->str, s, length + 1); |
6629161f | 113 | |
febfd508 | 114 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
115 | } |
116 | ||
18a28147 KS |
117 | static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) { |
118 | struct kdbus_item *i; | |
a56f19c4 | 119 | |
b5baa8fe | 120 | assert(d); |
b5baa8fe | 121 | |
18a28147 | 122 | i = ALIGN8_PTR(*d); |
b5baa8fe | 123 | |
18a28147 KS |
124 | i->size = offsetof(struct kdbus_item, bloom_filter) + |
125 | offsetof(struct kdbus_bloom_filter, data) + | |
126 | length; | |
127 | i->type = KDBUS_ITEM_BLOOM_FILTER; | |
b5baa8fe | 128 | |
18a28147 | 129 | *d = (struct kdbus_item *) ((uint8_t*) i + i->size); |
a56f19c4 | 130 | |
18a28147 | 131 | return &i->bloom_filter; |
a56f19c4 LP |
132 | } |
133 | ||
febfd508 | 134 | static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) { |
9097fe29 LP |
135 | assert(d); |
136 | assert(fds); | |
137 | assert(n_fds > 0); | |
138 | ||
139 | *d = ALIGN8_PTR(*d); | |
febfd508 | 140 | (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds; |
ea1edece | 141 | (*d)->type = KDBUS_ITEM_FDS; |
9097fe29 LP |
142 | memcpy((*d)->fds, fds, sizeof(int) * n_fds); |
143 | ||
febfd508 | 144 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
9097fe29 LP |
145 | } |
146 | ||
1abe54d9 LP |
147 | static void add_bloom_arg(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) { |
148 | char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")]; | |
149 | char *e; | |
150 | ||
151 | assert(data); | |
152 | assert(size > 0); | |
153 | assert(i < 64); | |
154 | assert(t); | |
155 | ||
156 | e = stpcpy(buf, "arg"); | |
157 | if (i < 10) | |
158 | *(e++) = '0' + (char) i; | |
159 | else { | |
160 | *(e++) = '0' + (char) (i / 10); | |
161 | *(e++) = '0' + (char) (i % 10); | |
162 | } | |
163 | ||
164 | *e = 0; | |
165 | bloom_add_pair(data, size, n_hash, buf, t); | |
166 | ||
167 | strcpy(e, "-dot-prefix"); | |
168 | bloom_add_prefixes(data, size, n_hash, buf, t, '.'); | |
169 | strcpy(e, "-slash-prefix"); | |
170 | bloom_add_prefixes(data, size, n_hash, buf, t, '/'); | |
171 | } | |
172 | ||
eccd47c5 | 173 | static void add_bloom_arg_has(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) { |
19bee5c3 | 174 | char buf[sizeof("arg")-1 + 2 + sizeof("-has")]; |
eccd47c5 LP |
175 | char *e; |
176 | ||
177 | assert(data); | |
178 | assert(size > 0); | |
179 | assert(i < 64); | |
180 | assert(t); | |
181 | ||
182 | e = stpcpy(buf, "arg"); | |
183 | if (i < 10) | |
184 | *(e++) = '0' + (char) i; | |
185 | else { | |
186 | *(e++) = '0' + (char) (i / 10); | |
187 | *(e++) = '0' + (char) (i % 10); | |
188 | } | |
189 | ||
19bee5c3 | 190 | strcpy(e, "-has"); |
eccd47c5 LP |
191 | bloom_add_pair(data, size, n_hash, buf, t); |
192 | } | |
193 | ||
18a28147 KS |
194 | static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) { |
195 | void *data; | |
a56f19c4 LP |
196 | unsigned i; |
197 | int r; | |
198 | ||
199 | assert(m); | |
200 | assert(bloom); | |
201 | ||
18a28147 | 202 | data = bloom->data; |
29804cc1 | 203 | memzero(data, m->bus->bloom_size); |
18a28147 | 204 | bloom->generation = 0; |
a56f19c4 | 205 | |
b28ff39f | 206 | 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 |
207 | |
208 | if (m->interface) | |
b28ff39f | 209 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface); |
a56f19c4 | 210 | if (m->member) |
b28ff39f | 211 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member); |
a56f19c4 | 212 | if (m->path) { |
b28ff39f LP |
213 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path); |
214 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path); | |
215 | bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/'); | |
a56f19c4 LP |
216 | } |
217 | ||
218 | r = sd_bus_message_rewind(m, true); | |
219 | if (r < 0) | |
220 | return r; | |
221 | ||
222 | for (i = 0; i < 64; i++) { | |
1abe54d9 | 223 | const char *t, *contents; |
a56f19c4 | 224 | char type; |
a56f19c4 | 225 | |
1abe54d9 | 226 | r = sd_bus_message_peek_type(m, &type, &contents); |
a56f19c4 LP |
227 | if (r < 0) |
228 | return r; | |
229 | ||
1abe54d9 | 230 | if (IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH, SD_BUS_TYPE_SIGNATURE)) { |
a56f19c4 | 231 | |
1abe54d9 LP |
232 | /* The bloom filter includes simple strings of any kind */ |
233 | r = sd_bus_message_read_basic(m, type, &t); | |
234 | if (r < 0) | |
235 | return r; | |
236 | ||
237 | add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t); | |
7d6884b6 TA |
238 | } |
239 | ||
240 | if (type == SD_BUS_TYPE_ARRAY && STR_IN_SET(contents, "s", "o", "g")) { | |
1abe54d9 LP |
241 | |
242 | /* As well as array of simple strings of any kinds */ | |
243 | r = sd_bus_message_enter_container(m, type, contents); | |
244 | if (r < 0) | |
245 | return r; | |
a56f19c4 | 246 | |
1abe54d9 | 247 | while ((r = sd_bus_message_read_basic(m, contents[0], &t)) > 0) |
eccd47c5 | 248 | add_bloom_arg_has(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t); |
1abe54d9 LP |
249 | if (r < 0) |
250 | return r; | |
251 | ||
252 | r = sd_bus_message_exit_container(m); | |
253 | if (r < 0) | |
254 | return r; | |
255 | ||
256 | } else | |
257 | /* Stop adding to bloom filter as soon as we | |
258 | * run into the first argument we cannot add | |
259 | * to it. */ | |
260 | break; | |
a56f19c4 LP |
261 | } |
262 | ||
263 | return 0; | |
b5baa8fe LP |
264 | } |
265 | ||
5b7d4c1c | 266 | static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { |
9b29bb68 | 267 | struct bus_body_part *part; |
febfd508 | 268 | struct kdbus_item *d; |
022fb855 | 269 | const char *destination; |
6629161f LP |
270 | bool well_known; |
271 | uint64_t unique; | |
272 | size_t sz, dl; | |
9b29bb68 | 273 | unsigned i; |
6629161f LP |
274 | int r; |
275 | ||
5b7d4c1c | 276 | assert(b); |
6629161f LP |
277 | assert(m); |
278 | assert(m->sealed); | |
e9a967f9 | 279 | |
069f5e61 LP |
280 | /* We put this together only once, if this message is reused |
281 | * we reuse the earlier-built version */ | |
e9a967f9 LP |
282 | if (m->kdbus) |
283 | return 0; | |
6629161f | 284 | |
022fb855 DM |
285 | destination = m->destination ?: m->destination_ptr; |
286 | ||
287 | if (destination) { | |
288 | r = bus_kernel_parse_unique_name(destination, &unique); | |
6629161f LP |
289 | if (r < 0) |
290 | return r; | |
291 | ||
292 | well_known = r == 0; | |
293 | } else | |
294 | well_known = false; | |
295 | ||
b1454bf0 | 296 | sz = offsetof(struct kdbus_msg, items); |
6629161f | 297 | |
69aec65c | 298 | /* Add in fixed header, fields header and payload */ |
77adde63 DH |
299 | sz += (1 + m->n_body_parts) * ALIGN8(offsetof(struct kdbus_item, vec) + |
300 | MAX(sizeof(struct kdbus_vec), | |
301 | sizeof(struct kdbus_memfd))); | |
6629161f | 302 | |
69aec65c | 303 | /* Add space for bloom filter */ |
18a28147 KS |
304 | sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) + |
305 | offsetof(struct kdbus_bloom_filter, data) + | |
b28ff39f | 306 | m->bus->bloom_size); |
b5baa8fe | 307 | |
6629161f LP |
308 | /* Add in well-known destination header */ |
309 | if (well_known) { | |
022fb855 | 310 | dl = strlen(destination); |
febfd508 | 311 | sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1); |
6629161f LP |
312 | } |
313 | ||
9097fe29 LP |
314 | /* Add space for unix fds */ |
315 | if (m->n_fds > 0) | |
febfd508 | 316 | sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds); |
9097fe29 | 317 | |
c556fe79 | 318 | m->kdbus = memalign(8, sz); |
66b26c5c LP |
319 | if (!m->kdbus) { |
320 | r = -ENOMEM; | |
321 | goto fail; | |
322 | } | |
6629161f | 323 | |
66b26c5c | 324 | m->free_kdbus = true; |
29804cc1 | 325 | memzero(m->kdbus, sz); |
d9115e18 | 326 | |
6629161f | 327 | m->kdbus->flags = |
94e15fdc | 328 | ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_EXPECT_REPLY) | |
d7d052b2 DM |
329 | ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_NO_AUTO_START : 0) | |
330 | ((m->header->type == SD_BUS_MESSAGE_SIGNAL) ? KDBUS_MSG_SIGNAL : 0); | |
022fb855 | 331 | |
7fa934b0 | 332 | if (well_known) |
022fb855 DM |
333 | /* verify_destination_id will usually be 0, which makes the kernel driver only look |
334 | * at the provided well-known name. Otherwise, the kernel will make sure the provided | |
335 | * destination id matches the owner of the provided weel-known-name, and fail if they | |
336 | * differ. Currently, this is only needed for bus-proxyd. */ | |
337 | m->kdbus->dst_id = m->verify_destination_id; | |
7fa934b0 | 338 | else |
022fb855 | 339 | m->kdbus->dst_id = destination ? unique : KDBUS_DST_ID_BROADCAST; |
022fb855 | 340 | |
6647dc66 | 341 | m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; |
2ac7c17f | 342 | m->kdbus->cookie = m->header->dbus2.cookie; |
ca7b42c8 | 343 | m->kdbus->priority = m->priority; |
80a33f11 | 344 | |
7fa934b0 | 345 | if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) |
693eb9a2 | 346 | m->kdbus->cookie_reply = m->reply_cookie; |
7fa934b0 | 347 | else { |
03785ad0 DM |
348 | struct timespec now; |
349 | ||
b680a194 | 350 | assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0); |
03785ad0 DM |
351 | m->kdbus->timeout_ns = now.tv_sec * NSEC_PER_SEC + now.tv_nsec + |
352 | m->timeout * NSEC_PER_USEC; | |
353 | } | |
6629161f | 354 | |
b1454bf0 | 355 | d = m->kdbus->items; |
6629161f LP |
356 | |
357 | if (well_known) | |
022fb855 | 358 | append_destination(&d, destination, dl); |
6629161f | 359 | |
c91cb83c | 360 | append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
a392d361 LP |
361 | |
362 | MESSAGE_FOREACH_PART(part, i, m) { | |
363 | if (part->is_zero) { | |
66b26c5c LP |
364 | /* If this is padding then simply send a |
365 | * vector with a NULL data pointer which the | |
366 | * kernel will just pass through. This is the | |
367 | * most efficient way to encode zeroes */ | |
368 | ||
a392d361 LP |
369 | append_payload_vec(&d, NULL, part->size); |
370 | continue; | |
371 | } | |
372 | ||
022fb855 | 373 | if (part->memfd >= 0 && part->sealed && destination) { |
66b26c5c LP |
374 | /* Try to send a memfd, if the part is |
375 | * sealed and this is not a broadcast. Since we can only */ | |
a392d361 | 376 | |
77adde63 | 377 | append_payload_memfd(&d, part->memfd, part->memfd_offset, part->size); |
66b26c5c | 378 | continue; |
a392d361 LP |
379 | } |
380 | ||
73e231ab JE |
381 | /* Otherwise, let's send a vector to the actual data. |
382 | * For that, we need to map it first. */ | |
66b26c5c LP |
383 | r = bus_body_part_map(part); |
384 | if (r < 0) | |
385 | goto fail; | |
a392d361 | 386 | |
bc7fd8cd | 387 | append_payload_vec(&d, part->data, part->size); |
a392d361 | 388 | } |
6629161f | 389 | |
7ce98121 | 390 | if (m->header->type == SD_BUS_MESSAGE_SIGNAL) { |
18a28147 | 391 | struct kdbus_bloom_filter *bloom; |
5b7d4c1c | 392 | |
b28ff39f | 393 | bloom = append_bloom(&d, m->bus->bloom_size); |
18a28147 | 394 | r = bus_message_setup_bloom(m, bloom); |
a392d361 LP |
395 | if (r < 0) |
396 | goto fail; | |
5b7d4c1c | 397 | } |
b5baa8fe | 398 | |
9097fe29 LP |
399 | if (m->n_fds > 0) |
400 | append_fds(&d, m->fds, m->n_fds); | |
401 | ||
e9a967f9 | 402 | m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus; |
6629161f LP |
403 | assert(m->kdbus->size <= sz); |
404 | ||
405 | return 0; | |
a392d361 LP |
406 | |
407 | fail: | |
66b26c5c | 408 | m->poisoned = true; |
a392d361 | 409 | return r; |
6629161f LP |
410 | } |
411 | ||
125dd074 ZJS |
412 | static void unset_memfds(struct sd_bus_message *m) { |
413 | struct bus_body_part *part; | |
414 | unsigned i; | |
415 | ||
416 | assert(m); | |
417 | ||
418 | /* Make sure the memfds are not freed twice */ | |
419 | MESSAGE_FOREACH_PART(part, i, m) | |
420 | if (part->memfd >= 0) | |
421 | part->memfd = -1; | |
422 | } | |
423 | ||
76877fb9 LP |
424 | static void message_set_timestamp(sd_bus *bus, sd_bus_message *m, const struct kdbus_timestamp *ts) { |
425 | assert(bus); | |
426 | assert(m); | |
427 | ||
428 | if (!ts) | |
429 | return; | |
430 | ||
431 | if (!(bus->attach_flags & KDBUS_ATTACH_TIMESTAMP)) | |
432 | return; | |
433 | ||
434 | m->realtime = ts->realtime_ns / NSEC_PER_USEC; | |
435 | m->monotonic = ts->monotonic_ns / NSEC_PER_USEC; | |
436 | m->seqnum = ts->seqnum; | |
437 | } | |
438 | ||
cb67f718 DM |
439 | static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { |
440 | sd_bus_message *m = NULL; | |
441 | struct kdbus_item *d; | |
442 | unsigned n_fds = 0; | |
443 | _cleanup_free_ int *fds = NULL; | |
2ac7c17f LP |
444 | struct bus_header *header = NULL; |
445 | void *footer = NULL; | |
446 | size_t header_size = 0, footer_size = 0; | |
447 | size_t n_bytes = 0, idx = 0; | |
cb67f718 | 448 | const char *destination = NULL, *seclabel = NULL; |
2ac7c17f | 449 | bool last_was_memfd = false; |
6629161f LP |
450 | int r; |
451 | ||
cb67f718 DM |
452 | assert(bus); |
453 | assert(k); | |
454 | assert(k->payload_type == KDBUS_PAYLOAD_DBUS); | |
35460afc | 455 | |
cb67f718 DM |
456 | KDBUS_ITEM_FOREACH(d, k, items) { |
457 | size_t l; | |
f08838da | 458 | |
cb67f718 | 459 | l = d->size - offsetof(struct kdbus_item, data); |
8f155917 | 460 | |
cb67f718 | 461 | switch (d->type) { |
62b3e928 | 462 | |
cb67f718 | 463 | case KDBUS_ITEM_PAYLOAD_OFF: |
2ac7c17f LP |
464 | if (!header) { |
465 | header = (struct bus_header*)((uint8_t*) k + d->vec.offset); | |
466 | header_size = d->vec.size; | |
954871d8 | 467 | } |
b381de41 | 468 | |
2ac7c17f LP |
469 | footer = (uint8_t*) k + d->vec.offset; |
470 | footer_size = d->vec.size; | |
471 | ||
cb67f718 | 472 | n_bytes += d->vec.size; |
2ac7c17f | 473 | last_was_memfd = false; |
cb67f718 | 474 | break; |
8a0e0ed9 | 475 | |
cb67f718 | 476 | case KDBUS_ITEM_PAYLOAD_MEMFD: |
2ac7c17f | 477 | if (!header) /* memfd cannot be first part */ |
cb67f718 | 478 | return -EBADMSG; |
8a0e0ed9 | 479 | |
cb67f718 | 480 | n_bytes += d->memfd.size; |
2ac7c17f | 481 | last_was_memfd = true; |
cb67f718 | 482 | break; |
8a0e0ed9 | 483 | |
cb67f718 DM |
484 | case KDBUS_ITEM_FDS: { |
485 | int *f; | |
486 | unsigned j; | |
8a0e0ed9 | 487 | |
cb67f718 DM |
488 | j = l / sizeof(int); |
489 | f = realloc(fds, sizeof(int) * (n_fds + j)); | |
490 | if (!f) | |
491 | return -ENOMEM; | |
8a0e0ed9 | 492 | |
cb67f718 DM |
493 | fds = f; |
494 | memcpy(fds + n_fds, d->fds, sizeof(int) * j); | |
495 | n_fds += j; | |
496 | break; | |
497 | } | |
62b3e928 | 498 | |
cb67f718 DM |
499 | case KDBUS_ITEM_SECLABEL: |
500 | seclabel = d->str; | |
501 | break; | |
fd8d62d9 LP |
502 | } |
503 | } | |
504 | ||
2ac7c17f | 505 | if (last_was_memfd) /* memfd cannot be last part */ |
cb67f718 | 506 | return -EBADMSG; |
de297575 | 507 | |
2ac7c17f LP |
508 | if (!header) |
509 | return -EBADMSG; | |
219728b3 | 510 | |
2ac7c17f | 511 | if (header_size < sizeof(struct bus_header)) |
cb67f718 | 512 | return -EBADMSG; |
6629161f | 513 | |
cb67f718 DM |
514 | /* on kdbus we only speak native endian gvariant, never dbus1 |
515 | * marshalling or reverse endian */ | |
2ac7c17f LP |
516 | if (header->version != 2 || |
517 | header->endian != BUS_NATIVE_ENDIAN) | |
cb67f718 | 518 | return -EPROTOTYPE; |
c58dea19 | 519 | |
2ac7c17f LP |
520 | r = bus_message_from_header( |
521 | bus, | |
522 | header, header_size, | |
523 | footer, footer_size, | |
524 | n_bytes, | |
525 | fds, n_fds, | |
2ac7c17f | 526 | seclabel, 0, &m); |
cb67f718 DM |
527 | if (r < 0) |
528 | return r; | |
6629161f | 529 | |
cb67f718 DM |
530 | /* The well-known names list is different from the other |
531 | credentials. If we asked for it, but nothing is there, this | |
532 | means that the list of well-known names is simply empty, not | |
533 | that we lack any data */ | |
35460afc | 534 | |
cb67f718 | 535 | m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask; |
f08838da | 536 | |
cb67f718 DM |
537 | KDBUS_ITEM_FOREACH(d, k, items) { |
538 | size_t l; | |
6629161f | 539 | |
cb67f718 | 540 | l = d->size - offsetof(struct kdbus_item, data); |
6629161f | 541 | |
cb67f718 | 542 | switch (d->type) { |
6629161f | 543 | |
cb67f718 DM |
544 | case KDBUS_ITEM_PAYLOAD_OFF: { |
545 | size_t begin_body; | |
6629161f | 546 | |
cb67f718 | 547 | begin_body = BUS_MESSAGE_BODY_BEGIN(m); |
6629161f | 548 | |
cb67f718 DM |
549 | if (idx + d->vec.size > begin_body) { |
550 | struct bus_body_part *part; | |
a43b9ca3 | 551 | |
cb67f718 | 552 | /* Contains body material */ |
6629161f | 553 | |
cb67f718 DM |
554 | part = message_append_part(m); |
555 | if (!part) { | |
556 | r = -ENOMEM; | |
557 | goto fail; | |
558 | } | |
a43b9ca3 | 559 | |
cb67f718 DM |
560 | /* A -1 offset is NUL padding. */ |
561 | part->is_zero = d->vec.offset == ~0ULL; | |
a43b9ca3 | 562 | |
cb67f718 DM |
563 | if (idx >= begin_body) { |
564 | if (!part->is_zero) | |
2ac7c17f | 565 | part->data = (uint8_t* )k + d->vec.offset; |
cb67f718 DM |
566 | part->size = d->vec.size; |
567 | } else { | |
568 | if (!part->is_zero) | |
2ac7c17f | 569 | part->data = (uint8_t*) k + d->vec.offset + (begin_body - idx); |
cb67f718 DM |
570 | part->size = d->vec.size - (begin_body - idx); |
571 | } | |
a43b9ca3 | 572 | |
cb67f718 | 573 | part->sealed = true; |
ff4994c5 | 574 | } |
a43b9ca3 | 575 | |
cb67f718 DM |
576 | idx += d->vec.size; |
577 | break; | |
578 | } | |
a43b9ca3 | 579 | |
cb67f718 DM |
580 | case KDBUS_ITEM_PAYLOAD_MEMFD: { |
581 | struct bus_body_part *part; | |
a43b9ca3 | 582 | |
cb67f718 DM |
583 | if (idx < BUS_MESSAGE_BODY_BEGIN(m)) { |
584 | r = -EBADMSG; | |
585 | goto fail; | |
ff4994c5 | 586 | } |
a43b9ca3 | 587 | |
cb67f718 DM |
588 | part = message_append_part(m); |
589 | if (!part) { | |
590 | r = -ENOMEM; | |
591 | goto fail; | |
592 | } | |
a43b9ca3 | 593 | |
cb67f718 | 594 | part->memfd = d->memfd.fd; |
77adde63 | 595 | part->memfd_offset = d->memfd.start; |
cb67f718 DM |
596 | part->size = d->memfd.size; |
597 | part->sealed = true; | |
a43b9ca3 | 598 | |
cb67f718 DM |
599 | idx += d->memfd.size; |
600 | break; | |
601 | } | |
a43b9ca3 | 602 | |
705a415f LP |
603 | case KDBUS_ITEM_PIDS: |
604 | ||
32802361 | 605 | /* The PID/TID might be missing, when the data |
2ac7c17f LP |
606 | * is faked by a bus proxy and it lacks that |
607 | * information about the real client (since | |
608 | * SO_PEERCRED is used for that). Also kernel | |
609 | * namespacing might make some of this data | |
610 | * unavailable when untranslatable. */ | |
705a415f LP |
611 | |
612 | if (d->pids.pid > 0) { | |
613 | m->creds.pid = (pid_t) d->pids.pid; | |
614 | m->creds.mask |= SD_BUS_CREDS_PID & bus->creds_mask; | |
615 | } | |
616 | ||
705a415f LP |
617 | if (d->pids.tid > 0) { |
618 | m->creds.tid = (pid_t) d->pids.tid; | |
cb67f718 DM |
619 | m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask; |
620 | } | |
705a415f | 621 | |
1386e47d LP |
622 | if (d->pids.ppid > 0) { |
623 | m->creds.ppid = (pid_t) d->pids.ppid; | |
624 | m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask; | |
cfeaa44a LP |
625 | } else if (d->pids.pid == 1) { |
626 | m->creds.ppid = 0; | |
627 | m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask; | |
1386e47d LP |
628 | } |
629 | ||
705a415f LP |
630 | break; |
631 | ||
632 | case KDBUS_ITEM_CREDS: | |
633 | ||
2ac7c17f LP |
634 | /* EUID/SUID/FSUID/EGID/SGID/FSGID might be |
635 | * missing too (see above). */ | |
705a415f | 636 | |
fed1e721 | 637 | if ((uid_t) d->creds.uid != UID_INVALID) { |
705a415f LP |
638 | m->creds.uid = (uid_t) d->creds.uid; |
639 | m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask; | |
640 | } | |
641 | ||
fed1e721 | 642 | if ((uid_t) d->creds.euid != UID_INVALID) { |
705a415f LP |
643 | m->creds.euid = (uid_t) d->creds.euid; |
644 | m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask; | |
645 | } | |
646 | ||
fed1e721 | 647 | if ((uid_t) d->creds.suid != UID_INVALID) { |
705a415f LP |
648 | m->creds.suid = (uid_t) d->creds.suid; |
649 | m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask; | |
650 | } | |
651 | ||
fed1e721 | 652 | if ((uid_t) d->creds.fsuid != UID_INVALID) { |
705a415f LP |
653 | m->creds.fsuid = (uid_t) d->creds.fsuid; |
654 | m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask; | |
655 | } | |
656 | ||
fed1e721 | 657 | if ((gid_t) d->creds.gid != GID_INVALID) { |
705a415f LP |
658 | m->creds.gid = (gid_t) d->creds.gid; |
659 | m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask; | |
660 | } | |
661 | ||
fed1e721 | 662 | if ((gid_t) d->creds.egid != GID_INVALID) { |
705a415f LP |
663 | m->creds.egid = (gid_t) d->creds.egid; |
664 | m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask; | |
665 | } | |
666 | ||
fed1e721 | 667 | if ((gid_t) d->creds.sgid != GID_INVALID) { |
705a415f LP |
668 | m->creds.sgid = (gid_t) d->creds.sgid; |
669 | m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask; | |
670 | } | |
671 | ||
fed1e721 | 672 | if ((gid_t) d->creds.fsgid != GID_INVALID) { |
705a415f LP |
673 | m->creds.fsgid = (gid_t) d->creds.fsgid; |
674 | m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask; | |
675 | } | |
676 | ||
cb67f718 | 677 | break; |
6629161f | 678 | |
cb67f718 | 679 | case KDBUS_ITEM_TIMESTAMP: |
76877fb9 | 680 | message_set_timestamp(bus, m, &d->timestamp); |
cb67f718 | 681 | break; |
fd8d62d9 | 682 | |
cb67f718 DM |
683 | case KDBUS_ITEM_PID_COMM: |
684 | m->creds.comm = d->str; | |
685 | m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask; | |
686 | break; | |
fd8d62d9 | 687 | |
cb67f718 DM |
688 | case KDBUS_ITEM_TID_COMM: |
689 | m->creds.tid_comm = d->str; | |
690 | m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask; | |
691 | break; | |
6629161f | 692 | |
cb67f718 DM |
693 | case KDBUS_ITEM_EXE: |
694 | m->creds.exe = d->str; | |
695 | m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask; | |
696 | break; | |
6629161f | 697 | |
cb67f718 DM |
698 | case KDBUS_ITEM_CMDLINE: |
699 | m->creds.cmdline = d->str; | |
700 | m->creds.cmdline_size = l; | |
701 | m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask; | |
702 | break; | |
777d7a61 | 703 | |
cb67f718 DM |
704 | case KDBUS_ITEM_CGROUP: |
705 | m->creds.cgroup = d->str; | |
706 | 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 | 707 | |
fe3f22d1 DK |
708 | r = bus_get_root_path(bus); |
709 | if (r < 0) | |
710 | goto fail; | |
777d7a61 | 711 | |
cb67f718 | 712 | m->creds.cgroup_root = bus->cgroup_root; |
cb67f718 | 713 | break; |
777d7a61 | 714 | |
cb67f718 | 715 | case KDBUS_ITEM_AUDIT: |
cfeaa44a LP |
716 | m->creds.audit_session_id = (uint32_t) d->audit.sessionid; |
717 | m->creds.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask; | |
6dfcc64b | 718 | |
cfeaa44a LP |
719 | m->creds.audit_login_uid = (uid_t) d->audit.loginuid; |
720 | m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask; | |
cb67f718 | 721 | break; |
777d7a61 | 722 | |
cb67f718 | 723 | case KDBUS_ITEM_CAPS: |
34a5d5e5 DH |
724 | if (d->caps.last_cap != cap_last_cap() || |
725 | d->size - offsetof(struct kdbus_item, caps.caps) < DIV_ROUND_UP(d->caps.last_cap, 32U) * 4 * 4) { | |
726 | r = -EBADMSG; | |
727 | goto fail; | |
728 | } | |
729 | ||
7d9fcc2b | 730 | m->creds.capability = d->caps.caps; |
cb67f718 DM |
731 | 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; |
732 | break; | |
219728b3 | 733 | |
cb67f718 | 734 | case KDBUS_ITEM_DST_NAME: |
9f6dfd06 LP |
735 | if (!service_name_is_valid(d->str)) { |
736 | r = -EBADMSG; | |
737 | goto fail; | |
738 | } | |
219728b3 | 739 | |
cb67f718 DM |
740 | destination = d->str; |
741 | break; | |
777d7a61 | 742 | |
635f9f0d | 743 | case KDBUS_ITEM_OWNED_NAME: |
9f6dfd06 LP |
744 | if (!service_name_is_valid(d->name.name)) { |
745 | r = -EBADMSG; | |
cb67f718 | 746 | goto fail; |
9f6dfd06 LP |
747 | } |
748 | ||
749 | if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) { | |
50c45216 LP |
750 | char **wkn; |
751 | size_t n; | |
752 | ||
753 | /* We just extend the array here, but | |
754 | * do not allocate the strings inside | |
755 | * of it, instead we just point to our | |
756 | * buffer directly. */ | |
757 | n = strv_length(m->creds.well_known_names); | |
758 | wkn = realloc(m->creds.well_known_names, (n + 2) * sizeof(char*)); | |
759 | if (!wkn) { | |
760 | r = -ENOMEM; | |
9f6dfd06 | 761 | goto fail; |
50c45216 LP |
762 | } |
763 | ||
764 | wkn[n] = d->name.name; | |
765 | wkn[n+1] = NULL; | |
766 | m->creds.well_known_names = wkn; | |
9f6dfd06 LP |
767 | |
768 | m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES; | |
769 | } | |
cb67f718 | 770 | break; |
777d7a61 | 771 | |
635f9f0d | 772 | case KDBUS_ITEM_CONN_DESCRIPTION: |
455971c1 LP |
773 | m->creds.description = d->str; |
774 | m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask; | |
cccb0b2c LP |
775 | break; |
776 | ||
02581590 LP |
777 | case KDBUS_ITEM_AUXGROUPS: |
778 | ||
779 | if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) { | |
606303a9 DM |
780 | size_t i, n; |
781 | gid_t *g; | |
02581590 | 782 | |
606303a9 DM |
783 | n = (d->size - offsetof(struct kdbus_item, data64)) / sizeof(uint64_t); |
784 | g = new(gid_t, n); | |
785 | if (!g) { | |
786 | r = -ENOMEM; | |
787 | goto fail; | |
788 | } | |
789 | ||
790 | for (i = 0; i < n; i++) | |
791 | g[i] = d->data64[i]; | |
792 | ||
793 | m->creds.supplementary_gids = g; | |
794 | m->creds.n_supplementary_gids = n; | |
02581590 LP |
795 | m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS; |
796 | } | |
797 | ||
798 | break; | |
799 | ||
cb67f718 DM |
800 | case KDBUS_ITEM_FDS: |
801 | case KDBUS_ITEM_SECLABEL: | |
3f624df6 | 802 | case KDBUS_ITEM_BLOOM_FILTER: |
cb67f718 | 803 | break; |
d78bf250 | 804 | |
cb67f718 DM |
805 | default: |
806 | log_debug("Got unknown field from kernel %llu", d->type); | |
807 | } | |
808 | } | |
d78bf250 | 809 | |
38ce47e2 LP |
810 | /* If we requested the list of well-known names to be appended |
811 | * and the sender had none no item for it will be | |
315a73d9 | 812 | * attached. However, this does *not* mean that the kernel |
38ce47e2 LP |
813 | * didn't want to provide this information to us. Hence, let's |
814 | * explicitly mark this information as available if it was | |
815 | * requested. */ | |
816 | m->creds.mask |= bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES; | |
817 | ||
cb67f718 DM |
818 | r = bus_message_parse_fields(m); |
819 | if (r < 0) | |
820 | goto fail; | |
777d7a61 | 821 | |
7fa934b0 | 822 | /* Refuse messages if kdbus and dbus1 cookie doesn't match up */ |
2ac7c17f | 823 | if ((uint64_t) m->header->dbus2.cookie != k->cookie) { |
7fa934b0 LP |
824 | r = -EBADMSG; |
825 | goto fail; | |
826 | } | |
827 | ||
828 | /* Refuse messages where the reply flag doesn't match up */ | |
94e15fdc | 829 | if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) { |
7fa934b0 LP |
830 | r = -EBADMSG; |
831 | goto fail; | |
832 | } | |
833 | ||
834 | /* Refuse reply messages where the reply cookie doesn't match up */ | |
835 | if ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) && m->reply_cookie != k->cookie_reply) { | |
836 | r = -EBADMSG; | |
837 | goto fail; | |
838 | } | |
839 | ||
840 | /* Refuse messages where the autostart flag doesn't match up */ | |
94e15fdc | 841 | if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) { |
7fa934b0 LP |
842 | r = -EBADMSG; |
843 | goto fail; | |
844 | } | |
845 | ||
cb67f718 | 846 | /* Override information from the user header with data from the kernel */ |
7d31d924 LP |
847 | if (k->src_id == KDBUS_SRC_ID_KERNEL) |
848 | bus_message_set_sender_driver(bus, m); | |
849 | else { | |
cb67f718 DM |
850 | snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id); |
851 | m->sender = m->creds.unique_name = m->sender_buffer; | |
852 | } | |
777d7a61 | 853 | |
cb67f718 DM |
854 | if (destination) |
855 | m->destination = destination; | |
856 | else if (k->dst_id == KDBUS_DST_ID_BROADCAST) | |
857 | m->destination = NULL; | |
858 | else if (k->dst_id == KDBUS_DST_ID_NAME) | |
859 | m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */ | |
860 | else { | |
861 | snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id); | |
862 | m->destination = m->destination_buffer; | |
863 | } | |
777d7a61 | 864 | |
cb67f718 DM |
865 | /* We take possession of the kmsg struct now */ |
866 | m->kdbus = k; | |
867 | m->release_kdbus = true; | |
868 | m->free_fds = true; | |
869 | fds = NULL; | |
777d7a61 | 870 | |
cb67f718 | 871 | bus->rqueue[bus->rqueue_size++] = m; |
777d7a61 | 872 | |
cb67f718 | 873 | return 1; |
777d7a61 | 874 | |
cb67f718 | 875 | fail: |
125dd074 ZJS |
876 | unset_memfds(m); |
877 | sd_bus_message_unref(m); | |
777d7a61 | 878 | |
cb67f718 DM |
879 | return r; |
880 | } | |
777d7a61 | 881 | |
cb67f718 | 882 | int bus_kernel_take_fd(sd_bus *b) { |
d31f486b | 883 | struct kdbus_bloom_parameter *bloom = NULL; |
6ad4a4fc | 884 | struct kdbus_item *items, *item; |
cb67f718 | 885 | struct kdbus_cmd_hello *hello; |
5972fe95 LP |
886 | _cleanup_free_ char *g = NULL; |
887 | const char *name; | |
888 | size_t l = 0, m = 0, sz; | |
cb67f718 | 889 | int r; |
777d7a61 | 890 | |
cb67f718 | 891 | assert(b); |
7adc46fc | 892 | |
cb67f718 DM |
893 | if (b->is_server) |
894 | return -EINVAL; | |
777d7a61 | 895 | |
cb67f718 | 896 | b->use_memfd = 1; |
777d7a61 | 897 | |
455971c1 LP |
898 | if (b->description) { |
899 | g = bus_label_escape(b->description); | |
5972fe95 LP |
900 | if (!g) |
901 | return -ENOMEM; | |
902 | ||
903 | name = g; | |
904 | } else { | |
905 | char pr[17] = {}; | |
906 | ||
907 | /* If no name is explicitly set, we'll include a hint | |
908 | * indicating the library implementation, a hint which | |
909 | * kind of bus this is and the thread name */ | |
910 | ||
911 | assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0); | |
912 | ||
913 | if (isempty(pr)) { | |
914 | name = b->is_system ? "sd-system" : | |
915 | b->is_user ? "sd-user" : "sd"; | |
916 | } else { | |
917 | _cleanup_free_ char *e = NULL; | |
918 | ||
a6278b88 | 919 | e = bus_label_escape(pr); |
5972fe95 LP |
920 | if (!e) |
921 | return -ENOMEM; | |
922 | ||
923 | g = strappend(b->is_system ? "sd-system-" : | |
924 | b->is_user ? "sd-user-" : "sd-", | |
925 | e); | |
926 | if (!g) | |
927 | return -ENOMEM; | |
928 | ||
929 | name = g; | |
930 | } | |
931 | ||
455971c1 LP |
932 | b->description = bus_label_unescape(name); |
933 | if (!b->description) | |
5972fe95 LP |
934 | return -ENOMEM; |
935 | } | |
936 | ||
937 | m = strlen(name); | |
938 | ||
939 | sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) + | |
940 | ALIGN8(offsetof(struct kdbus_item, str) + m + 1); | |
777d7a61 | 941 | |
cb67f718 | 942 | if (b->fake_creds_valid) |
5972fe95 | 943 | sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds)); |
777d7a61 | 944 | |
705a415f LP |
945 | if (b->fake_pids_valid) |
946 | sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids)); | |
947 | ||
cb67f718 DM |
948 | if (b->fake_label) { |
949 | l = strlen(b->fake_label); | |
950 | sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1); | |
951 | } | |
777d7a61 | 952 | |
7f3d3ba1 | 953 | hello = alloca0_align(sz, 8); |
cb67f718 | 954 | hello->size = sz; |
bc75205c | 955 | hello->flags = b->hello_flags; |
6f5c810a | 956 | hello->attach_flags_send = _KDBUS_ATTACH_ANY; |
d704fda9 | 957 | hello->attach_flags_recv = b->attach_flags; |
cb67f718 | 958 | hello->pool_size = KDBUS_POOL_SIZE; |
777d7a61 | 959 | |
cb67f718 DM |
960 | item = hello->items; |
961 | ||
5972fe95 | 962 | item->size = offsetof(struct kdbus_item, str) + m + 1; |
635f9f0d | 963 | item->type = KDBUS_ITEM_CONN_DESCRIPTION; |
5972fe95 LP |
964 | memcpy(item->str, name, m + 1); |
965 | item = KDBUS_ITEM_NEXT(item); | |
966 | ||
cb67f718 DM |
967 | if (b->fake_creds_valid) { |
968 | item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds); | |
969 | item->type = KDBUS_ITEM_CREDS; | |
970 | item->creds = b->fake_creds; | |
971 | ||
972 | item = KDBUS_ITEM_NEXT(item); | |
777d7a61 LP |
973 | } |
974 | ||
705a415f LP |
975 | if (b->fake_pids_valid) { |
976 | item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids); | |
977 | item->type = KDBUS_ITEM_PIDS; | |
978 | item->pids = b->fake_pids; | |
979 | ||
980 | item = KDBUS_ITEM_NEXT(item); | |
981 | } | |
982 | ||
cb67f718 DM |
983 | if (b->fake_label) { |
984 | item->size = offsetof(struct kdbus_item, str) + l + 1; | |
5972fe95 | 985 | item->type = KDBUS_ITEM_SECLABEL; |
cb67f718 | 986 | memcpy(item->str, b->fake_label, l+1); |
777d7a61 LP |
987 | } |
988 | ||
cb67f718 | 989 | r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello); |
524d896a LP |
990 | if (r < 0) { |
991 | if (errno == ENOTTY) | |
992 | /* If the ioctl is not supported we assume that the | |
993 | * API version changed in a major incompatible way, | |
994 | * let's indicate an API incompatibility in this | |
995 | * case. */ | |
996 | return -ESOCKTNOSUPPORT; | |
997 | ||
cb67f718 | 998 | return -errno; |
524d896a | 999 | } |
777d7a61 | 1000 | |
cb67f718 DM |
1001 | if (!b->kdbus_buffer) { |
1002 | b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0); | |
1003 | if (b->kdbus_buffer == MAP_FAILED) { | |
1004 | b->kdbus_buffer = NULL; | |
d31f486b DH |
1005 | r = -errno; |
1006 | goto fail; | |
cb67f718 DM |
1007 | } |
1008 | } | |
6629161f | 1009 | |
4a3e79e1 | 1010 | /* The higher 32bit of the bus_flags fields are considered |
cb67f718 | 1011 | * 'incompatible flags'. Refuse them all for now. */ |
d31f486b | 1012 | if (hello->bus_flags > 0xFFFFFFFFULL) { |
524d896a | 1013 | r = -ESOCKTNOSUPPORT; |
d31f486b DH |
1014 | goto fail; |
1015 | } | |
6629161f | 1016 | |
d31f486b DH |
1017 | /* extract bloom parameters from items */ |
1018 | items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset); | |
6ad4a4fc | 1019 | KDBUS_FOREACH(item, items, hello->items_size) { |
d31f486b DH |
1020 | switch (item->type) { |
1021 | case KDBUS_ITEM_BLOOM_PARAMETER: | |
1022 | bloom = &item->bloom_parameter; | |
1023 | break; | |
1024 | } | |
1025 | } | |
6629161f | 1026 | |
d31f486b | 1027 | if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) { |
15411c0c | 1028 | r = -EOPNOTSUPP; |
d31f486b DH |
1029 | goto fail; |
1030 | } | |
b28ff39f | 1031 | |
d31f486b DH |
1032 | b->bloom_size = (size_t) bloom->size; |
1033 | b->bloom_n_hash = (unsigned) bloom->n_hash; | |
1034 | ||
1035 | if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) { | |
1036 | r = -ENOMEM; | |
1037 | goto fail; | |
1038 | } | |
6629161f | 1039 | |
cb67f718 | 1040 | b->unique_id = hello->id; |
6629161f | 1041 | |
cb67f718 DM |
1042 | b->is_kernel = true; |
1043 | b->bus_client = true; | |
bc75205c | 1044 | b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD); |
cb67f718 DM |
1045 | b->message_version = 2; |
1046 | b->message_endian = BUS_NATIVE_ENDIAN; | |
c91cb83c | 1047 | |
cb67f718 DM |
1048 | /* the kernel told us the UUID of the underlying bus */ |
1049 | memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes)); | |
6629161f | 1050 | |
d31f486b DH |
1051 | /* free returned items */ |
1052 | (void) bus_kernel_cmd_free(b, hello->offset); | |
cb67f718 | 1053 | return bus_start_running(b); |
d31f486b DH |
1054 | |
1055 | fail: | |
72e61104 | 1056 | (void) bus_kernel_cmd_free(b, hello->offset); |
d31f486b | 1057 | return r; |
cb67f718 | 1058 | } |
6629161f | 1059 | |
cb67f718 DM |
1060 | int bus_kernel_connect(sd_bus *b) { |
1061 | assert(b); | |
1062 | assert(b->input_fd < 0); | |
1063 | assert(b->output_fd < 0); | |
1064 | assert(b->kernel); | |
1307c3ff | 1065 | |
cb67f718 DM |
1066 | if (b->is_server) |
1067 | return -EINVAL; | |
1307c3ff | 1068 | |
cb67f718 DM |
1069 | b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC); |
1070 | if (b->input_fd < 0) | |
1071 | return -errno; | |
6629161f | 1072 | |
cb67f718 | 1073 | b->output_fd = b->input_fd; |
6629161f | 1074 | |
cb67f718 DM |
1075 | return bus_kernel_take_fd(b); |
1076 | } | |
f9be01f3 | 1077 | |
52cfc037 LP |
1078 | int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) { |
1079 | struct kdbus_cmd_free cmd = { | |
d31f486b | 1080 | .size = sizeof(cmd), |
52cfc037 LP |
1081 | .offset = offset, |
1082 | }; | |
1083 | int r; | |
1084 | ||
1085 | assert(bus); | |
1086 | assert(bus->is_kernel); | |
1087 | ||
1088 | r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd); | |
1089 | if (r < 0) | |
1090 | return -errno; | |
1091 | ||
1092 | return 0; | |
1093 | } | |
1094 | ||
069f5e61 | 1095 | static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { |
069f5e61 LP |
1096 | struct kdbus_item *d; |
1097 | ||
1098 | assert(bus); | |
1099 | assert(k); | |
1100 | ||
069f5e61 | 1101 | KDBUS_ITEM_FOREACH(d, k, items) { |
069f5e61 LP |
1102 | if (d->type == KDBUS_ITEM_FDS) |
1103 | close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int)); | |
1104 | else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD) | |
03e334a1 | 1105 | safe_close(d->memfd.fd); |
069f5e61 | 1106 | } |
ca794c8e | 1107 | |
52cfc037 | 1108 | bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer); |
069f5e61 LP |
1109 | } |
1110 | ||
1111 | int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) { | |
94e15fdc | 1112 | struct kdbus_cmd_send cmd = { }; |
cb67f718 | 1113 | int r; |
6629161f | 1114 | |
cb67f718 DM |
1115 | assert(bus); |
1116 | assert(m); | |
1117 | assert(bus->state == BUS_RUNNING); | |
6629161f | 1118 | |
cb67f718 DM |
1119 | /* If we can't deliver, we want room for the error message */ |
1120 | r = bus_rqueue_make_room(bus); | |
6629161f LP |
1121 | if (r < 0) |
1122 | return r; | |
1123 | ||
cb67f718 | 1124 | r = bus_message_setup_kmsg(bus, m); |
6629161f LP |
1125 | if (r < 0) |
1126 | return r; | |
1127 | ||
94e15fdc DH |
1128 | cmd.size = sizeof(cmd); |
1129 | cmd.msg_address = (uintptr_t)m->kdbus; | |
1130 | ||
069f5e61 LP |
1131 | /* If this is a synchronous method call, then let's tell the |
1132 | * kernel, so that it can pass CPU time/scheduling to the | |
1133 | * destination for the time, if it wants to. If we | |
1134 | * synchronously wait for the result anyway, we won't need CPU | |
1135 | * anyway. */ | |
94e15fdc DH |
1136 | if (hint_sync_call) { |
1137 | m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY; | |
1138 | cmd.flags |= KDBUS_SEND_SYNC_REPLY; | |
1139 | } | |
069f5e61 | 1140 | |
94e15fdc | 1141 | r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd); |
cb67f718 DM |
1142 | if (r < 0) { |
1143 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
1144 | sd_bus_message *reply; | |
253ce82b | 1145 | |
cb67f718 DM |
1146 | if (errno == EAGAIN || errno == EINTR) |
1147 | return 0; | |
1148 | else if (errno == ENXIO || errno == ESRCH) { | |
6629161f | 1149 | |
cb67f718 DM |
1150 | /* ENXIO: unique name not known |
1151 | * ESRCH: well-known name not known */ | |
6629161f | 1152 | |
cb67f718 DM |
1153 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
1154 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination); | |
1155 | else { | |
1156 | log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination); | |
1157 | return 0; | |
1158 | } | |
777d7a61 | 1159 | |
cb67f718 | 1160 | } else if (errno == EADDRNOTAVAIL) { |
fd8d62d9 | 1161 | |
cb67f718 | 1162 | /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */ |
bc7fd8cd | 1163 | |
cb67f718 DM |
1164 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
1165 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination); | |
1166 | else { | |
1167 | log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination); | |
1168 | return 0; | |
1169 | } | |
1170 | } else | |
1171 | return -errno; | |
bc7fd8cd | 1172 | |
cb67f718 DM |
1173 | r = bus_message_new_synthetic_error( |
1174 | bus, | |
1175 | BUS_MESSAGE_COOKIE(m), | |
1176 | &error, | |
1177 | &reply); | |
bc7fd8cd | 1178 | |
cb67f718 DM |
1179 | if (r < 0) |
1180 | return r; | |
bc7fd8cd | 1181 | |
cb67f718 DM |
1182 | r = bus_seal_synthetic_message(bus, reply); |
1183 | if (r < 0) | |
1184 | return r; | |
62b3e928 | 1185 | |
cb67f718 | 1186 | bus->rqueue[bus->rqueue_size++] = reply; |
bc7fd8cd | 1187 | |
069f5e61 LP |
1188 | } else if (hint_sync_call) { |
1189 | struct kdbus_msg *k; | |
fd8d62d9 | 1190 | |
94e15fdc | 1191 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset); |
069f5e61 | 1192 | assert(k); |
777d7a61 | 1193 | |
069f5e61 | 1194 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
1307c3ff | 1195 | |
069f5e61 LP |
1196 | r = bus_kernel_make_message(bus, k); |
1197 | if (r < 0) { | |
1198 | close_kdbus_msg(bus, k); | |
1307c3ff | 1199 | |
069f5e61 LP |
1200 | /* Anybody can send us invalid messages, let's just drop them. */ |
1201 | if (r == -EBADMSG || r == -EPROTOTYPE) | |
b267a6d2 | 1202 | log_debug_errno(r, "Ignoring invalid synchronous reply: %m"); |
069f5e61 LP |
1203 | else |
1204 | return r; | |
1205 | } | |
1206 | } else { | |
1207 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
1208 | close_kdbus_msg(bus, k); | |
1209 | } | |
cb67f718 | 1210 | } |
069f5e61 LP |
1211 | |
1212 | return 1; | |
cb67f718 | 1213 | } |
69aec65c | 1214 | |
76877fb9 LP |
1215 | static int push_name_owner_changed( |
1216 | sd_bus *bus, | |
1217 | const char *name, | |
1218 | const char *old_owner, | |
1219 | const char *new_owner, | |
1220 | const struct kdbus_timestamp *ts) { | |
1221 | ||
cb67f718 DM |
1222 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
1223 | int r; | |
2dc9970b | 1224 | |
cb67f718 | 1225 | assert(bus); |
2dc9970b | 1226 | |
cb67f718 DM |
1227 | r = sd_bus_message_new_signal( |
1228 | bus, | |
151b9b96 | 1229 | &m, |
cb67f718 DM |
1230 | "/org/freedesktop/DBus", |
1231 | "org.freedesktop.DBus", | |
151b9b96 | 1232 | "NameOwnerChanged"); |
cb67f718 DM |
1233 | if (r < 0) |
1234 | return r; | |
2dc9970b | 1235 | |
cb67f718 DM |
1236 | r = sd_bus_message_append(m, "sss", name, old_owner, new_owner); |
1237 | if (r < 0) | |
1238 | return r; | |
5b12334d | 1239 | |
7d31d924 | 1240 | bus_message_set_sender_driver(bus, m); |
76877fb9 | 1241 | message_set_timestamp(bus, m, ts); |
5b12334d | 1242 | |
cb67f718 DM |
1243 | r = bus_seal_synthetic_message(bus, m); |
1244 | if (r < 0) | |
1245 | return r; | |
5b12334d | 1246 | |
cb67f718 DM |
1247 | bus->rqueue[bus->rqueue_size++] = m; |
1248 | m = NULL; | |
5b12334d | 1249 | |
cb67f718 DM |
1250 | return 1; |
1251 | } | |
5b12334d | 1252 | |
76877fb9 LP |
1253 | static int translate_name_change( |
1254 | sd_bus *bus, | |
1255 | const struct kdbus_msg *k, | |
1256 | const struct kdbus_item *d, | |
1257 | const struct kdbus_timestamp *ts) { | |
1258 | ||
cb67f718 | 1259 | char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX]; |
5b12334d | 1260 | |
cb67f718 DM |
1261 | assert(bus); |
1262 | assert(k); | |
1263 | assert(d); | |
751bc6ac | 1264 | |
619d7a03 | 1265 | if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) |
cb67f718 DM |
1266 | old_owner[0] = 0; |
1267 | else | |
619d7a03 | 1268 | sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id); |
751bc6ac | 1269 | |
619d7a03 | 1270 | if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) { |
751bc6ac | 1271 | |
cb67f718 DM |
1272 | if (isempty(old_owner)) |
1273 | return 0; | |
5b12334d | 1274 | |
cb67f718 DM |
1275 | new_owner[0] = 0; |
1276 | } else | |
619d7a03 | 1277 | sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id); |
5b12334d | 1278 | |
76877fb9 | 1279 | return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner, ts); |
cb67f718 | 1280 | } |
5b12334d | 1281 | |
76877fb9 LP |
1282 | static int translate_id_change( |
1283 | sd_bus *bus, | |
1284 | const struct kdbus_msg *k, | |
1285 | const struct kdbus_item *d, | |
1286 | const struct kdbus_timestamp *ts) { | |
1287 | ||
cb67f718 | 1288 | char owner[UNIQUE_NAME_MAX]; |
2e2ec0ea | 1289 | |
cb67f718 DM |
1290 | assert(bus); |
1291 | assert(k); | |
1292 | assert(d); | |
777d7a61 | 1293 | |
cb67f718 | 1294 | sprintf(owner, ":1.%llu", d->id_change.id); |
2e2ec0ea | 1295 | |
cb67f718 DM |
1296 | return push_name_owner_changed( |
1297 | bus, owner, | |
1298 | d->type == KDBUS_ITEM_ID_ADD ? NULL : owner, | |
76877fb9 LP |
1299 | d->type == KDBUS_ITEM_ID_ADD ? owner : NULL, |
1300 | ts); | |
cb67f718 | 1301 | } |
49b832c5 | 1302 | |
76877fb9 LP |
1303 | static int translate_reply( |
1304 | sd_bus *bus, | |
1305 | const struct kdbus_msg *k, | |
1306 | const struct kdbus_item *d, | |
1307 | const struct kdbus_timestamp *ts) { | |
1308 | ||
cb67f718 DM |
1309 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
1310 | int r; | |
777d7a61 | 1311 | |
cb67f718 DM |
1312 | assert(bus); |
1313 | assert(k); | |
1314 | assert(d); | |
acb5a3cb | 1315 | |
cb67f718 DM |
1316 | r = bus_message_new_synthetic_error( |
1317 | bus, | |
1318 | k->cookie_reply, | |
1319 | d->type == KDBUS_ITEM_REPLY_TIMEOUT ? | |
1320 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") : | |
1321 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"), | |
1322 | &m); | |
1307c3ff | 1323 | if (r < 0) |
cb67f718 | 1324 | return r; |
51038c03 | 1325 | |
76877fb9 | 1326 | message_set_timestamp(bus, m, ts); |
51038c03 | 1327 | |
cb67f718 DM |
1328 | r = bus_seal_synthetic_message(bus, m); |
1329 | if (r < 0) | |
1330 | return r; | |
6629161f | 1331 | |
7adc46fc | 1332 | bus->rqueue[bus->rqueue_size++] = m; |
cb67f718 | 1333 | m = NULL; |
7d22c717 | 1334 | |
6629161f | 1335 | return 1; |
cb67f718 | 1336 | } |
1307c3ff | 1337 | |
cb67f718 | 1338 | static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) { |
76877fb9 | 1339 | static int (* const translate[])(sd_bus *bus, const struct kdbus_msg *k, const struct kdbus_item *d, const struct kdbus_timestamp *ts) = { |
cb67f718 DM |
1340 | [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, |
1341 | [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1342 | [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1307c3ff | 1343 | |
cb67f718 DM |
1344 | [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, |
1345 | [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, | |
1346 | ||
1347 | [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1348 | [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1349 | }; | |
1350 | ||
76877fb9 LP |
1351 | struct kdbus_item *d, *found = NULL; |
1352 | struct kdbus_timestamp *ts = NULL; | |
1353 | ||
cb67f718 DM |
1354 | assert(bus); |
1355 | assert(k); | |
1356 | assert(k->payload_type == KDBUS_PAYLOAD_KERNEL); | |
1357 | ||
1358 | KDBUS_ITEM_FOREACH(d, k, items) { | |
856d6e09 | 1359 | if (d->type == KDBUS_ITEM_TIMESTAMP) |
76877fb9 | 1360 | ts = &d->timestamp; |
95cdf5e3 | 1361 | else if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) { |
cb67f718 DM |
1362 | if (found) |
1363 | return -EBADMSG; | |
1364 | found = d; | |
1365 | } else | |
1366 | log_debug("Got unknown field from kernel %llu", d->type); | |
1307c3ff LP |
1367 | } |
1368 | ||
cb67f718 DM |
1369 | if (!found) { |
1370 | log_debug("Didn't find a kernel message to translate."); | |
1371 | return 0; | |
1372 | } | |
1373 | ||
76877fb9 | 1374 | return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found, ts); |
6629161f LP |
1375 | } |
1376 | ||
766c5809 | 1377 | int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) { |
94e15fdc | 1378 | struct kdbus_cmd_recv recv = { .size = sizeof(recv) }; |
6629161f | 1379 | struct kdbus_msg *k; |
6629161f LP |
1380 | int r; |
1381 | ||
1382 | assert(bus); | |
7d22c717 | 1383 | |
7adc46fc | 1384 | r = bus_rqueue_make_room(bus); |
7d22c717 LP |
1385 | if (r < 0) |
1386 | return r; | |
6629161f | 1387 | |
766c5809 LP |
1388 | if (hint_priority) { |
1389 | recv.flags |= KDBUS_RECV_USE_PRIORITY; | |
1390 | recv.priority = priority; | |
1391 | } | |
1392 | ||
94e15fdc | 1393 | r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv); |
83e30358 DH |
1394 | if (recv.return_flags & KDBUS_RECV_RETURN_DROPPED_MSGS) |
1395 | log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs); | |
fd8d62d9 | 1396 | if (r < 0) { |
6629161f LP |
1397 | if (errno == EAGAIN) |
1398 | return 0; | |
1399 | ||
fd8d62d9 | 1400 | return -errno; |
6629161f LP |
1401 | } |
1402 | ||
a9c8343e | 1403 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.msg.offset); |
e1d337d4 | 1404 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
7d22c717 | 1405 | r = bus_kernel_make_message(bus, k); |
e1d337d4 LP |
1406 | |
1407 | /* Anybody can send us invalid messages, let's just drop them. */ | |
1408 | if (r == -EBADMSG || r == -EPROTOTYPE) { | |
da927ba9 | 1409 | log_debug_errno(r, "Ignoring invalid message: %m"); |
e1d337d4 LP |
1410 | r = 0; |
1411 | } | |
1412 | ||
0c9cc10d DH |
1413 | if (r <= 0) |
1414 | close_kdbus_msg(bus, k); | |
1415 | } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) { | |
7d22c717 | 1416 | r = bus_kernel_translate_message(bus, k); |
0c9cc10d DH |
1417 | close_kdbus_msg(bus, k); |
1418 | } else { | |
069f5e61 | 1419 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); |
777d7a61 | 1420 | r = 0; |
fd8d62d9 | 1421 | close_kdbus_msg(bus, k); |
0c9cc10d | 1422 | } |
6629161f | 1423 | |
51038c03 | 1424 | return r < 0 ? r : 1; |
6629161f LP |
1425 | } |
1426 | ||
8e959fbf | 1427 | int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) { |
bc7fd8cd | 1428 | struct memfd_cache *c; |
45fbe937 | 1429 | int fd; |
bc7fd8cd LP |
1430 | |
1431 | assert(address); | |
8e959fbf LP |
1432 | assert(mapped); |
1433 | assert(allocated); | |
35460afc LP |
1434 | |
1435 | if (!bus || !bus->is_kernel) | |
15411c0c | 1436 | return -EOPNOTSUPP; |
bc7fd8cd | 1437 | |
50e0d56c | 1438 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) == 0); |
45fbe937 | 1439 | |
bc7fd8cd | 1440 | if (bus->n_memfd_cache <= 0) { |
45fbe937 LP |
1441 | int r; |
1442 | ||
50e0d56c | 1443 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0); |
bc7fd8cd | 1444 | |
455971c1 | 1445 | r = memfd_new(bus->description); |
9b05bc48 | 1446 | if (r < 0) |
73843b52 | 1447 | return r; |
bc7fd8cd LP |
1448 | |
1449 | *address = NULL; | |
8e959fbf LP |
1450 | *mapped = 0; |
1451 | *allocated = 0; | |
a6082d77 | 1452 | return r; |
bc7fd8cd LP |
1453 | } |
1454 | ||
bf30e48f | 1455 | c = &bus->memfd_cache[--bus->n_memfd_cache]; |
bc7fd8cd LP |
1456 | |
1457 | assert(c->fd >= 0); | |
8e959fbf | 1458 | assert(c->mapped == 0 || c->address); |
bc7fd8cd LP |
1459 | |
1460 | *address = c->address; | |
8e959fbf LP |
1461 | *mapped = c->mapped; |
1462 | *allocated = c->allocated; | |
45fbe937 LP |
1463 | fd = c->fd; |
1464 | ||
50e0d56c | 1465 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0); |
bc7fd8cd | 1466 | |
45fbe937 LP |
1467 | return fd; |
1468 | } | |
1469 | ||
1470 | static void close_and_munmap(int fd, void *address, size_t size) { | |
1471 | if (size > 0) | |
76b7742c | 1472 | assert_se(munmap(address, PAGE_ALIGN(size)) >= 0); |
45fbe937 | 1473 | |
03e334a1 | 1474 | safe_close(fd); |
bc7fd8cd LP |
1475 | } |
1476 | ||
8e959fbf | 1477 | void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) { |
bc7fd8cd | 1478 | struct memfd_cache *c; |
8e959fbf | 1479 | uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX); |
bc7fd8cd LP |
1480 | |
1481 | assert(fd >= 0); | |
8e959fbf | 1482 | assert(mapped == 0 || address); |
bc7fd8cd | 1483 | |
45fbe937 | 1484 | if (!bus || !bus->is_kernel) { |
8e959fbf | 1485 | close_and_munmap(fd, address, mapped); |
45fbe937 LP |
1486 | return; |
1487 | } | |
1488 | ||
50e0d56c | 1489 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) == 0); |
bc7fd8cd | 1490 | |
45fbe937 | 1491 | if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) { |
50e0d56c | 1492 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0); |
bc7fd8cd | 1493 | |
8e959fbf | 1494 | close_and_munmap(fd, address, mapped); |
bc7fd8cd LP |
1495 | return; |
1496 | } | |
1497 | ||
1498 | c = &bus->memfd_cache[bus->n_memfd_cache++]; | |
1499 | c->fd = fd; | |
1500 | c->address = address; | |
1501 | ||
1502 | /* If overly long, let's return a bit to the OS */ | |
8e959fbf | 1503 | if (mapped > max_mapped) { |
73843b52 | 1504 | assert_se(memfd_set_size(fd, max_mapped) >= 0); |
8e959fbf LP |
1505 | assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0); |
1506 | c->mapped = c->allocated = max_mapped; | |
1507 | } else { | |
1508 | c->mapped = mapped; | |
1509 | c->allocated = allocated; | |
1510 | } | |
45fbe937 | 1511 | |
50e0d56c | 1512 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) == 0); |
bc7fd8cd LP |
1513 | } |
1514 | ||
1515 | void bus_kernel_flush_memfd(sd_bus *b) { | |
1516 | unsigned i; | |
1517 | ||
1518 | assert(b); | |
1519 | ||
76b7742c | 1520 | for (i = 0; i < b->n_memfd_cache; i++) |
8e959fbf | 1521 | close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped); |
bc7fd8cd | 1522 | } |
0253ddcc | 1523 | |
b5dae4c7 | 1524 | uint64_t request_name_flags_to_kdbus(uint64_t flags) { |
e3dd987c | 1525 | uint64_t f = 0; |
0253ddcc | 1526 | |
e3dd987c LP |
1527 | if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT) |
1528 | f |= KDBUS_NAME_ALLOW_REPLACEMENT; | |
0253ddcc | 1529 | |
e3dd987c LP |
1530 | if (flags & SD_BUS_NAME_REPLACE_EXISTING) |
1531 | f |= KDBUS_NAME_REPLACE_EXISTING; | |
0253ddcc | 1532 | |
d90bb669 | 1533 | if (flags & SD_BUS_NAME_QUEUE) |
e3dd987c | 1534 | f |= KDBUS_NAME_QUEUE; |
0253ddcc | 1535 | |
b5dae4c7 | 1536 | return f; |
e3dd987c LP |
1537 | } |
1538 | ||
b5dae4c7 | 1539 | uint64_t attach_flags_to_kdbus(uint64_t mask) { |
e3dd987c LP |
1540 | uint64_t m = 0; |
1541 | ||
705a415f LP |
1542 | if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID| |
1543 | SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID)) | |
e3dd987c LP |
1544 | m |= KDBUS_ATTACH_CREDS; |
1545 | ||
1386e47d | 1546 | if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID|SD_BUS_CREDS_PPID)) |
705a415f LP |
1547 | m |= KDBUS_ATTACH_PIDS; |
1548 | ||
a2243d54 DM |
1549 | if (mask & SD_BUS_CREDS_COMM) |
1550 | m |= KDBUS_ATTACH_PID_COMM; | |
1551 | ||
1552 | if (mask & SD_BUS_CREDS_TID_COMM) | |
1553 | m |= KDBUS_ATTACH_TID_COMM; | |
e3dd987c LP |
1554 | |
1555 | if (mask & SD_BUS_CREDS_EXE) | |
1556 | m |= KDBUS_ATTACH_EXE; | |
1557 | ||
1558 | if (mask & SD_BUS_CREDS_CMDLINE) | |
1559 | m |= KDBUS_ATTACH_CMDLINE; | |
1560 | ||
1561 | 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)) | |
1562 | m |= KDBUS_ATTACH_CGROUP; | |
1563 | ||
1564 | if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) | |
1565 | m |= KDBUS_ATTACH_CAPS; | |
1566 | ||
1567 | if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) | |
1568 | m |= KDBUS_ATTACH_SECLABEL; | |
0253ddcc | 1569 | |
e3dd987c LP |
1570 | if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) |
1571 | m |= KDBUS_ATTACH_AUDIT; | |
1572 | ||
49b832c5 LP |
1573 | if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) |
1574 | m |= KDBUS_ATTACH_NAMES; | |
1575 | ||
455971c1 | 1576 | if (mask & SD_BUS_CREDS_DESCRIPTION) |
635f9f0d | 1577 | m |= KDBUS_ATTACH_CONN_DESCRIPTION; |
cccb0b2c | 1578 | |
02581590 LP |
1579 | if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) |
1580 | m |= KDBUS_ATTACH_AUXGROUPS; | |
1581 | ||
b5dae4c7 | 1582 | return m; |
0253ddcc | 1583 | } |
e3dd987c | 1584 | |
f2769777 | 1585 | int bus_kernel_create_bus(const char *name, bool world, char **s) { |
b2086f60 | 1586 | struct kdbus_cmd *make; |
e3dd987c | 1587 | struct kdbus_item *n; |
fa7796e9 | 1588 | size_t l; |
e3dd987c LP |
1589 | int fd; |
1590 | ||
1591 | assert(name); | |
1592 | assert(s); | |
1593 | ||
63cc4c31 | 1594 | fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); |
e3dd987c LP |
1595 | if (fd < 0) |
1596 | return -errno; | |
1597 | ||
fa7796e9 | 1598 | l = strlen(name); |
b2086f60 | 1599 | make = alloca0_align(offsetof(struct kdbus_cmd, items) + |
fa7796e9 LP |
1600 | ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) + |
1601 | ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) + | |
1602 | ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1), | |
7f3d3ba1 | 1603 | 8); |
e3dd987c | 1604 | |
b2086f60 | 1605 | make->size = offsetof(struct kdbus_cmd, items); |
816a3f9e | 1606 | |
fa7796e9 | 1607 | /* Set the bloom parameters */ |
e3dd987c | 1608 | n = make->items; |
18a28147 KS |
1609 | n->size = offsetof(struct kdbus_item, bloom_parameter) + |
1610 | sizeof(struct kdbus_bloom_parameter); | |
1611 | n->type = KDBUS_ITEM_BLOOM_PARAMETER; | |
b28ff39f LP |
1612 | n->bloom_parameter.size = DEFAULT_BLOOM_SIZE; |
1613 | n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH; | |
1614 | ||
1615 | assert_cc(DEFAULT_BLOOM_SIZE > 0); | |
1616 | assert_cc(DEFAULT_BLOOM_N_HASH > 0); | |
1617 | ||
816a3f9e DM |
1618 | make->size += ALIGN8(n->size); |
1619 | ||
19ee32dc DH |
1620 | /* Provide all metadata via bus-owner queries */ |
1621 | n = KDBUS_ITEM_NEXT(n); | |
1622 | n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND; | |
1623 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); | |
fa7796e9 LP |
1624 | n->data64[0] = _KDBUS_ATTACH_ANY; |
1625 | make->size += ALIGN8(n->size); | |
1626 | ||
1627 | /* Set the a good name */ | |
816a3f9e | 1628 | n = KDBUS_ITEM_NEXT(n); |
a4152e3f | 1629 | sprintf(n->str, UID_FMT "-%s", getuid(), name); |
e3dd987c | 1630 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; |
5e16c257 | 1631 | n->type = KDBUS_ITEM_MAKE_NAME; |
816a3f9e | 1632 | make->size += ALIGN8(n->size); |
e3dd987c | 1633 | |
f7c7cd03 | 1634 | make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0; |
e3dd987c LP |
1635 | |
1636 | if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { | |
03e334a1 | 1637 | safe_close(fd); |
524d896a LP |
1638 | |
1639 | /* Major API change? then the ioctls got shuffled around. */ | |
1640 | if (errno == ENOTTY) | |
1641 | return -ESOCKTNOSUPPORT; | |
1642 | ||
e3dd987c LP |
1643 | return -errno; |
1644 | } | |
1645 | ||
1646 | if (s) { | |
1647 | char *p; | |
1648 | ||
63cc4c31 | 1649 | p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL); |
e3dd987c | 1650 | if (!p) { |
03e334a1 | 1651 | safe_close(fd); |
e3dd987c LP |
1652 | return -ENOMEM; |
1653 | } | |
1654 | ||
1655 | *s = p; | |
1656 | } | |
1657 | ||
1658 | return fd; | |
1659 | } | |
9bd37b40 | 1660 | |
8f077bf9 | 1661 | int bus_kernel_open_bus_fd(const char *bus, char **path) { |
a4152e3f LP |
1662 | char *p; |
1663 | int fd; | |
8f077bf9 | 1664 | size_t len; |
1683342a | 1665 | |
8aee3fc7 LP |
1666 | assert(bus); |
1667 | ||
63cc4c31 | 1668 | len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1; |
8f077bf9 ZJS |
1669 | |
1670 | if (path) { | |
8aee3fc7 | 1671 | p = new(char, len); |
8f077bf9 ZJS |
1672 | if (!p) |
1673 | return -ENOMEM; | |
8f077bf9 | 1674 | } else |
8aee3fc7 LP |
1675 | p = newa(char, len); |
1676 | ||
63cc4c31 | 1677 | sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus); |
1683342a | 1678 | |
a4152e3f | 1679 | fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); |
8aee3fc7 LP |
1680 | if (fd < 0) { |
1681 | if (path) | |
1682 | free(p); | |
1683 | ||
a4152e3f | 1684 | return -errno; |
8aee3fc7 LP |
1685 | } |
1686 | ||
1687 | if (path) | |
1688 | *path = p; | |
a4152e3f LP |
1689 | |
1690 | return fd; | |
1683342a DM |
1691 | } |
1692 | ||
e7d718af | 1693 | int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) { |
8e00bfc2 | 1694 | _cleanup_free_ char *path = NULL; |
b2086f60 | 1695 | struct kdbus_cmd *make; |
e7d718af | 1696 | struct kdbus_item *n; |
342f3005 | 1697 | const char *name; |
e7d718af DM |
1698 | int fd; |
1699 | ||
1700 | fd = bus_kernel_open_bus_fd(bus_name, &path); | |
1701 | if (fd < 0) | |
1702 | return fd; | |
1703 | ||
b2086f60 | 1704 | make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd, items)) + |
342f3005 DH |
1705 | ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + strlen(ep_name) + 1), |
1706 | 8); | |
b2086f60 | 1707 | make->size = ALIGN8(offsetof(struct kdbus_cmd, items)); |
e7d718af DM |
1708 | make->flags = KDBUS_MAKE_ACCESS_WORLD; |
1709 | ||
1710 | n = make->items; | |
342f3005 DH |
1711 | sprintf(n->str, UID_FMT "-%s", getuid(), ep_name); |
1712 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
e7d718af | 1713 | n->type = KDBUS_ITEM_MAKE_NAME; |
342f3005 DH |
1714 | make->size += ALIGN8(n->size); |
1715 | name = n->str; | |
e7d718af | 1716 | |
40885bb2 | 1717 | if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) { |
e7d718af DM |
1718 | safe_close(fd); |
1719 | return -errno; | |
1720 | } | |
1721 | ||
e7d718af | 1722 | if (ep_path) { |
2c652b6b LP |
1723 | char *p; |
1724 | ||
342f3005 | 1725 | p = strjoin(dirname(path), "/", name, NULL); |
2c652b6b | 1726 | if (!p) { |
4edf33d1 | 1727 | safe_close(fd); |
e7d718af | 1728 | return -ENOMEM; |
4edf33d1 | 1729 | } |
2c652b6b LP |
1730 | |
1731 | *ep_path = p; | |
e7d718af DM |
1732 | } |
1733 | ||
1734 | return fd; | |
1735 | } | |
1736 | ||
ae095f86 | 1737 | int bus_kernel_try_close(sd_bus *bus) { |
b2086f60 DH |
1738 | struct kdbus_cmd byebye = { .size = sizeof(byebye) }; |
1739 | ||
ae095f86 LP |
1740 | assert(bus); |
1741 | assert(bus->is_kernel); | |
1742 | ||
b2086f60 | 1743 | if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE, &byebye) < 0) |
ae095f86 LP |
1744 | return -errno; |
1745 | ||
1746 | return 0; | |
1747 | } | |
ff975efb LP |
1748 | |
1749 | int bus_kernel_drop_one(int fd) { | |
1750 | struct kdbus_cmd_recv recv = { | |
94e15fdc DH |
1751 | .size = sizeof(recv), |
1752 | .flags = KDBUS_RECV_DROP, | |
ff975efb LP |
1753 | }; |
1754 | ||
1755 | assert(fd >= 0); | |
1756 | ||
94e15fdc | 1757 | if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0) |
ff975efb LP |
1758 | return -errno; |
1759 | ||
1760 | return 0; | |
1761 | } | |
b5dae4c7 LP |
1762 | |
1763 | int bus_kernel_realize_attach_flags(sd_bus *bus) { | |
b2086f60 | 1764 | struct kdbus_cmd *update; |
b5dae4c7 LP |
1765 | struct kdbus_item *n; |
1766 | ||
1767 | assert(bus); | |
1768 | assert(bus->is_kernel); | |
1769 | ||
b2086f60 | 1770 | update = alloca0_align(offsetof(struct kdbus_cmd, items) + |
fa7796e9 LP |
1771 | ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)), |
1772 | 8); | |
b5dae4c7 LP |
1773 | |
1774 | n = update->items; | |
1775 | n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV; | |
1776 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); | |
1777 | n->data64[0] = bus->attach_flags; | |
1778 | ||
fa7796e9 | 1779 | update->size = |
b2086f60 | 1780 | offsetof(struct kdbus_cmd, items) + |
fa7796e9 | 1781 | ALIGN8(n->size); |
b5dae4c7 | 1782 | |
b2086f60 | 1783 | if (ioctl(bus->input_fd, KDBUS_CMD_UPDATE, update) < 0) |
b5dae4c7 LP |
1784 | return -errno; |
1785 | ||
1786 | return 0; | |
1787 | } | |
1a299299 | 1788 | |
3acc1daf LP |
1789 | int bus_kernel_get_bus_name(sd_bus *bus, char **name) { |
1790 | struct kdbus_cmd_info cmd = { | |
1791 | .size = sizeof(struct kdbus_cmd_info), | |
1792 | }; | |
1793 | struct kdbus_info *info; | |
1794 | struct kdbus_item *item; | |
1795 | char *n = NULL; | |
1796 | int r; | |
1797 | ||
1798 | assert(bus); | |
1799 | assert(name); | |
1800 | assert(bus->is_kernel); | |
1801 | ||
1802 | r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd); | |
1803 | if (r < 0) | |
1804 | return -errno; | |
1805 | ||
1806 | info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset); | |
1807 | ||
1808 | KDBUS_ITEM_FOREACH(item, info, items) | |
1809 | if (item->type == KDBUS_ITEM_MAKE_NAME) { | |
1810 | r = free_and_strdup(&n, item->str); | |
1811 | break; | |
1812 | } | |
1813 | ||
1814 | bus_kernel_cmd_free(bus, cmd.offset); | |
1815 | ||
1816 | if (r < 0) | |
1817 | return r; | |
1818 | if (!n) | |
1819 | return -EIO; | |
1820 | ||
1821 | *name = n; | |
1822 | return 0; | |
1823 | } |