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6629161f LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
7211f918 LP |
22 | #ifdef HAVE_VALGRIND_MEMCHECK_H |
23 | #include <valgrind/memcheck.h> | |
24 | #endif | |
25 | ||
6629161f | 26 | #include <fcntl.h> |
c556fe79 | 27 | #include <malloc.h> |
fd8d62d9 | 28 | #include <sys/mman.h> |
5972fe95 | 29 | #include <sys/prctl.h> |
6629161f | 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 | ||
6629161f | 37 | #include "util.h" |
65dae17a | 38 | #include "strv.h" |
6bcf0cf6 | 39 | #include "memfd-util.h" |
34a5d5e5 | 40 | #include "capability.h" |
1a299299 | 41 | #include "fileio.h" |
6482f626 | 42 | #include "formats-util.h" |
6629161f LP |
43 | |
44 | #include "bus-internal.h" | |
45 | #include "bus-message.h" | |
46 | #include "bus-kernel.h" | |
a56f19c4 | 47 | #include "bus-bloom.h" |
a6278b88 | 48 | #include "bus-label.h" |
777d7a61 LP |
49 | |
50 | #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t)) | |
6629161f | 51 | |
c7819669 | 52 | int bus_kernel_parse_unique_name(const char *s, uint64_t *id) { |
6629161f LP |
53 | int r; |
54 | ||
55 | assert(s); | |
56 | assert(id); | |
57 | ||
58 | if (!startswith(s, ":1.")) | |
59 | return 0; | |
60 | ||
61 | r = safe_atou64(s + 3, id); | |
62 | if (r < 0) | |
63 | return r; | |
64 | ||
65 | return 1; | |
66 | } | |
67 | ||
febfd508 | 68 | static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) { |
6629161f | 69 | assert(d); |
6629161f LP |
70 | assert(sz > 0); |
71 | ||
e86b80b8 LP |
72 | *d = ALIGN8_PTR(*d); |
73 | ||
66b26c5c LP |
74 | /* Note that p can be NULL, which encodes a region full of |
75 | * zeroes, which is useful to optimize certain padding | |
76 | * conditions */ | |
77 | ||
febfd508 | 78 | (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec); |
ea1edece | 79 | (*d)->type = KDBUS_ITEM_PAYLOAD_VEC; |
a392d361 | 80 | (*d)->vec.address = PTR_TO_UINT64(p); |
6629161f LP |
81 | (*d)->vec.size = sz; |
82 | ||
febfd508 | 83 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
84 | } |
85 | ||
77adde63 | 86 | static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t start, size_t sz) { |
a392d361 LP |
87 | assert(d); |
88 | assert(memfd >= 0); | |
89 | assert(sz > 0); | |
90 | ||
91 | *d = ALIGN8_PTR(*d); | |
92 | (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd); | |
ea1edece | 93 | (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD; |
a392d361 | 94 | (*d)->memfd.fd = memfd; |
77adde63 | 95 | (*d)->memfd.start = start; |
a392d361 LP |
96 | (*d)->memfd.size = sz; |
97 | ||
98 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); | |
99 | } | |
100 | ||
febfd508 | 101 | static void append_destination(struct kdbus_item **d, const char *s, size_t length) { |
6629161f | 102 | assert(d); |
b5baa8fe | 103 | assert(s); |
6629161f | 104 | |
e86b80b8 LP |
105 | *d = ALIGN8_PTR(*d); |
106 | ||
febfd508 | 107 | (*d)->size = offsetof(struct kdbus_item, str) + length + 1; |
ea1edece | 108 | (*d)->type = KDBUS_ITEM_DST_NAME; |
51038c03 | 109 | memcpy((*d)->str, s, length + 1); |
6629161f | 110 | |
febfd508 | 111 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
112 | } |
113 | ||
18a28147 KS |
114 | static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) { |
115 | struct kdbus_item *i; | |
a56f19c4 | 116 | |
b5baa8fe | 117 | assert(d); |
b5baa8fe | 118 | |
18a28147 | 119 | i = ALIGN8_PTR(*d); |
b5baa8fe | 120 | |
18a28147 KS |
121 | i->size = offsetof(struct kdbus_item, bloom_filter) + |
122 | offsetof(struct kdbus_bloom_filter, data) + | |
123 | length; | |
124 | i->type = KDBUS_ITEM_BLOOM_FILTER; | |
b5baa8fe | 125 | |
18a28147 | 126 | *d = (struct kdbus_item *) ((uint8_t*) i + i->size); |
a56f19c4 | 127 | |
18a28147 | 128 | return &i->bloom_filter; |
a56f19c4 LP |
129 | } |
130 | ||
febfd508 | 131 | static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) { |
9097fe29 LP |
132 | assert(d); |
133 | assert(fds); | |
134 | assert(n_fds > 0); | |
135 | ||
136 | *d = ALIGN8_PTR(*d); | |
febfd508 | 137 | (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds; |
ea1edece | 138 | (*d)->type = KDBUS_ITEM_FDS; |
9097fe29 LP |
139 | memcpy((*d)->fds, fds, sizeof(int) * n_fds); |
140 | ||
febfd508 | 141 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
9097fe29 LP |
142 | } |
143 | ||
1abe54d9 LP |
144 | static void add_bloom_arg(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) { |
145 | char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")]; | |
146 | char *e; | |
147 | ||
148 | assert(data); | |
149 | assert(size > 0); | |
150 | assert(i < 64); | |
151 | assert(t); | |
152 | ||
153 | e = stpcpy(buf, "arg"); | |
154 | if (i < 10) | |
155 | *(e++) = '0' + (char) i; | |
156 | else { | |
157 | *(e++) = '0' + (char) (i / 10); | |
158 | *(e++) = '0' + (char) (i % 10); | |
159 | } | |
160 | ||
161 | *e = 0; | |
162 | bloom_add_pair(data, size, n_hash, buf, t); | |
163 | ||
164 | strcpy(e, "-dot-prefix"); | |
165 | bloom_add_prefixes(data, size, n_hash, buf, t, '.'); | |
166 | strcpy(e, "-slash-prefix"); | |
167 | bloom_add_prefixes(data, size, n_hash, buf, t, '/'); | |
168 | } | |
169 | ||
eccd47c5 LP |
170 | static void add_bloom_arg_has(void *data, size_t size, unsigned n_hash, unsigned i, const char *t) { |
171 | char buf[sizeof("arg")-1 + 2 + sizeof("has")]; | |
172 | char *e; | |
173 | ||
174 | assert(data); | |
175 | assert(size > 0); | |
176 | assert(i < 64); | |
177 | assert(t); | |
178 | ||
179 | e = stpcpy(buf, "arg"); | |
180 | if (i < 10) | |
181 | *(e++) = '0' + (char) i; | |
182 | else { | |
183 | *(e++) = '0' + (char) (i / 10); | |
184 | *(e++) = '0' + (char) (i % 10); | |
185 | } | |
186 | ||
187 | strcpy(e, "has"); | |
188 | bloom_add_pair(data, size, n_hash, buf, t); | |
189 | } | |
190 | ||
18a28147 KS |
191 | static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) { |
192 | void *data; | |
a56f19c4 LP |
193 | unsigned i; |
194 | int r; | |
195 | ||
196 | assert(m); | |
197 | assert(bloom); | |
198 | ||
18a28147 | 199 | data = bloom->data; |
29804cc1 | 200 | memzero(data, m->bus->bloom_size); |
18a28147 | 201 | bloom->generation = 0; |
a56f19c4 | 202 | |
b28ff39f | 203 | 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 |
204 | |
205 | if (m->interface) | |
b28ff39f | 206 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface); |
a56f19c4 | 207 | if (m->member) |
b28ff39f | 208 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member); |
a56f19c4 | 209 | if (m->path) { |
b28ff39f LP |
210 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path); |
211 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path); | |
212 | bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/'); | |
a56f19c4 LP |
213 | } |
214 | ||
215 | r = sd_bus_message_rewind(m, true); | |
216 | if (r < 0) | |
217 | return r; | |
218 | ||
219 | for (i = 0; i < 64; i++) { | |
1abe54d9 | 220 | const char *t, *contents; |
a56f19c4 | 221 | char type; |
a56f19c4 | 222 | |
1abe54d9 | 223 | r = sd_bus_message_peek_type(m, &type, &contents); |
a56f19c4 LP |
224 | if (r < 0) |
225 | return r; | |
226 | ||
1abe54d9 | 227 | if (IN_SET(type, SD_BUS_TYPE_STRING, SD_BUS_TYPE_OBJECT_PATH, SD_BUS_TYPE_SIGNATURE)) { |
a56f19c4 | 228 | |
1abe54d9 LP |
229 | /* The bloom filter includes simple strings of any kind */ |
230 | r = sd_bus_message_read_basic(m, type, &t); | |
231 | if (r < 0) | |
232 | return r; | |
233 | ||
234 | add_bloom_arg(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t); | |
7d6884b6 TA |
235 | } |
236 | ||
237 | if (type == SD_BUS_TYPE_ARRAY && STR_IN_SET(contents, "s", "o", "g")) { | |
1abe54d9 LP |
238 | |
239 | /* As well as array of simple strings of any kinds */ | |
240 | r = sd_bus_message_enter_container(m, type, contents); | |
241 | if (r < 0) | |
242 | return r; | |
a56f19c4 | 243 | |
1abe54d9 | 244 | while ((r = sd_bus_message_read_basic(m, contents[0], &t)) > 0) |
eccd47c5 | 245 | add_bloom_arg_has(data, m->bus->bloom_size, m->bus->bloom_n_hash, i, t); |
1abe54d9 LP |
246 | if (r < 0) |
247 | return r; | |
248 | ||
249 | r = sd_bus_message_exit_container(m); | |
250 | if (r < 0) | |
251 | return r; | |
252 | ||
253 | } else | |
254 | /* Stop adding to bloom filter as soon as we | |
255 | * run into the first argument we cannot add | |
256 | * to it. */ | |
257 | break; | |
a56f19c4 LP |
258 | } |
259 | ||
260 | return 0; | |
b5baa8fe LP |
261 | } |
262 | ||
5b7d4c1c | 263 | static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { |
9b29bb68 | 264 | struct bus_body_part *part; |
febfd508 | 265 | struct kdbus_item *d; |
022fb855 | 266 | const char *destination; |
6629161f LP |
267 | bool well_known; |
268 | uint64_t unique; | |
269 | size_t sz, dl; | |
9b29bb68 | 270 | unsigned i; |
6629161f LP |
271 | int r; |
272 | ||
5b7d4c1c | 273 | assert(b); |
6629161f LP |
274 | assert(m); |
275 | assert(m->sealed); | |
e9a967f9 | 276 | |
069f5e61 LP |
277 | /* We put this together only once, if this message is reused |
278 | * we reuse the earlier-built version */ | |
e9a967f9 LP |
279 | if (m->kdbus) |
280 | return 0; | |
6629161f | 281 | |
022fb855 DM |
282 | destination = m->destination ?: m->destination_ptr; |
283 | ||
284 | if (destination) { | |
285 | r = bus_kernel_parse_unique_name(destination, &unique); | |
6629161f LP |
286 | if (r < 0) |
287 | return r; | |
288 | ||
289 | well_known = r == 0; | |
290 | } else | |
291 | well_known = false; | |
292 | ||
b1454bf0 | 293 | sz = offsetof(struct kdbus_msg, items); |
6629161f | 294 | |
69aec65c | 295 | /* Add in fixed header, fields header and payload */ |
77adde63 DH |
296 | sz += (1 + m->n_body_parts) * ALIGN8(offsetof(struct kdbus_item, vec) + |
297 | MAX(sizeof(struct kdbus_vec), | |
298 | sizeof(struct kdbus_memfd))); | |
6629161f | 299 | |
69aec65c | 300 | /* Add space for bloom filter */ |
18a28147 KS |
301 | sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) + |
302 | offsetof(struct kdbus_bloom_filter, data) + | |
b28ff39f | 303 | m->bus->bloom_size); |
b5baa8fe | 304 | |
6629161f LP |
305 | /* Add in well-known destination header */ |
306 | if (well_known) { | |
022fb855 | 307 | dl = strlen(destination); |
febfd508 | 308 | sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1); |
6629161f LP |
309 | } |
310 | ||
9097fe29 LP |
311 | /* Add space for unix fds */ |
312 | if (m->n_fds > 0) | |
febfd508 | 313 | sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds); |
9097fe29 | 314 | |
c556fe79 | 315 | m->kdbus = memalign(8, sz); |
66b26c5c LP |
316 | if (!m->kdbus) { |
317 | r = -ENOMEM; | |
318 | goto fail; | |
319 | } | |
6629161f | 320 | |
66b26c5c | 321 | m->free_kdbus = true; |
29804cc1 | 322 | memzero(m->kdbus, sz); |
d9115e18 | 323 | |
6629161f | 324 | m->kdbus->flags = |
94e15fdc | 325 | ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_EXPECT_REPLY) | |
d7d052b2 DM |
326 | ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_NO_AUTO_START : 0) | |
327 | ((m->header->type == SD_BUS_MESSAGE_SIGNAL) ? KDBUS_MSG_SIGNAL : 0); | |
022fb855 | 328 | |
7fa934b0 | 329 | if (well_known) |
022fb855 DM |
330 | /* verify_destination_id will usually be 0, which makes the kernel driver only look |
331 | * at the provided well-known name. Otherwise, the kernel will make sure the provided | |
332 | * destination id matches the owner of the provided weel-known-name, and fail if they | |
333 | * differ. Currently, this is only needed for bus-proxyd. */ | |
334 | m->kdbus->dst_id = m->verify_destination_id; | |
7fa934b0 | 335 | else |
022fb855 | 336 | m->kdbus->dst_id = destination ? unique : KDBUS_DST_ID_BROADCAST; |
022fb855 | 337 | |
6647dc66 | 338 | m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; |
2ac7c17f | 339 | m->kdbus->cookie = m->header->dbus2.cookie; |
ca7b42c8 | 340 | m->kdbus->priority = m->priority; |
80a33f11 | 341 | |
7fa934b0 | 342 | if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) |
693eb9a2 | 343 | m->kdbus->cookie_reply = m->reply_cookie; |
7fa934b0 | 344 | else { |
03785ad0 DM |
345 | struct timespec now; |
346 | ||
b680a194 | 347 | assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0); |
03785ad0 DM |
348 | m->kdbus->timeout_ns = now.tv_sec * NSEC_PER_SEC + now.tv_nsec + |
349 | m->timeout * NSEC_PER_USEC; | |
350 | } | |
6629161f | 351 | |
b1454bf0 | 352 | d = m->kdbus->items; |
6629161f LP |
353 | |
354 | if (well_known) | |
022fb855 | 355 | append_destination(&d, destination, dl); |
6629161f | 356 | |
c91cb83c | 357 | append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
a392d361 LP |
358 | |
359 | MESSAGE_FOREACH_PART(part, i, m) { | |
360 | if (part->is_zero) { | |
66b26c5c LP |
361 | /* If this is padding then simply send a |
362 | * vector with a NULL data pointer which the | |
363 | * kernel will just pass through. This is the | |
364 | * most efficient way to encode zeroes */ | |
365 | ||
a392d361 LP |
366 | append_payload_vec(&d, NULL, part->size); |
367 | continue; | |
368 | } | |
369 | ||
022fb855 | 370 | if (part->memfd >= 0 && part->sealed && destination) { |
66b26c5c LP |
371 | /* Try to send a memfd, if the part is |
372 | * sealed and this is not a broadcast. Since we can only */ | |
a392d361 | 373 | |
77adde63 | 374 | append_payload_memfd(&d, part->memfd, part->memfd_offset, part->size); |
66b26c5c | 375 | continue; |
a392d361 LP |
376 | } |
377 | ||
73e231ab JE |
378 | /* Otherwise, let's send a vector to the actual data. |
379 | * For that, we need to map it first. */ | |
66b26c5c LP |
380 | r = bus_body_part_map(part); |
381 | if (r < 0) | |
382 | goto fail; | |
a392d361 | 383 | |
bc7fd8cd | 384 | append_payload_vec(&d, part->data, part->size); |
a392d361 | 385 | } |
6629161f | 386 | |
7ce98121 | 387 | if (m->header->type == SD_BUS_MESSAGE_SIGNAL) { |
18a28147 | 388 | struct kdbus_bloom_filter *bloom; |
5b7d4c1c | 389 | |
b28ff39f | 390 | bloom = append_bloom(&d, m->bus->bloom_size); |
18a28147 | 391 | r = bus_message_setup_bloom(m, bloom); |
a392d361 LP |
392 | if (r < 0) |
393 | goto fail; | |
5b7d4c1c | 394 | } |
b5baa8fe | 395 | |
9097fe29 LP |
396 | if (m->n_fds > 0) |
397 | append_fds(&d, m->fds, m->n_fds); | |
398 | ||
e9a967f9 | 399 | m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus; |
6629161f LP |
400 | assert(m->kdbus->size <= sz); |
401 | ||
402 | return 0; | |
a392d361 LP |
403 | |
404 | fail: | |
66b26c5c | 405 | m->poisoned = true; |
a392d361 | 406 | return r; |
6629161f LP |
407 | } |
408 | ||
125dd074 ZJS |
409 | static void unset_memfds(struct sd_bus_message *m) { |
410 | struct bus_body_part *part; | |
411 | unsigned i; | |
412 | ||
413 | assert(m); | |
414 | ||
415 | /* Make sure the memfds are not freed twice */ | |
416 | MESSAGE_FOREACH_PART(part, i, m) | |
417 | if (part->memfd >= 0) | |
418 | part->memfd = -1; | |
419 | } | |
420 | ||
76877fb9 LP |
421 | static void message_set_timestamp(sd_bus *bus, sd_bus_message *m, const struct kdbus_timestamp *ts) { |
422 | assert(bus); | |
423 | assert(m); | |
424 | ||
425 | if (!ts) | |
426 | return; | |
427 | ||
428 | if (!(bus->attach_flags & KDBUS_ATTACH_TIMESTAMP)) | |
429 | return; | |
430 | ||
431 | m->realtime = ts->realtime_ns / NSEC_PER_USEC; | |
432 | m->monotonic = ts->monotonic_ns / NSEC_PER_USEC; | |
433 | m->seqnum = ts->seqnum; | |
434 | } | |
435 | ||
cb67f718 DM |
436 | static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { |
437 | sd_bus_message *m = NULL; | |
438 | struct kdbus_item *d; | |
439 | unsigned n_fds = 0; | |
440 | _cleanup_free_ int *fds = NULL; | |
2ac7c17f LP |
441 | struct bus_header *header = NULL; |
442 | void *footer = NULL; | |
443 | size_t header_size = 0, footer_size = 0; | |
444 | size_t n_bytes = 0, idx = 0; | |
cb67f718 | 445 | const char *destination = NULL, *seclabel = NULL; |
2ac7c17f | 446 | bool last_was_memfd = false; |
6629161f LP |
447 | int r; |
448 | ||
cb67f718 DM |
449 | assert(bus); |
450 | assert(k); | |
451 | assert(k->payload_type == KDBUS_PAYLOAD_DBUS); | |
35460afc | 452 | |
cb67f718 DM |
453 | KDBUS_ITEM_FOREACH(d, k, items) { |
454 | size_t l; | |
f08838da | 455 | |
cb67f718 | 456 | l = d->size - offsetof(struct kdbus_item, data); |
8f155917 | 457 | |
cb67f718 | 458 | switch (d->type) { |
62b3e928 | 459 | |
cb67f718 | 460 | case KDBUS_ITEM_PAYLOAD_OFF: |
2ac7c17f LP |
461 | if (!header) { |
462 | header = (struct bus_header*)((uint8_t*) k + d->vec.offset); | |
463 | header_size = d->vec.size; | |
954871d8 | 464 | } |
b381de41 | 465 | |
2ac7c17f LP |
466 | footer = (uint8_t*) k + d->vec.offset; |
467 | footer_size = d->vec.size; | |
468 | ||
cb67f718 | 469 | n_bytes += d->vec.size; |
2ac7c17f | 470 | last_was_memfd = false; |
cb67f718 | 471 | break; |
8a0e0ed9 | 472 | |
cb67f718 | 473 | case KDBUS_ITEM_PAYLOAD_MEMFD: |
2ac7c17f | 474 | if (!header) /* memfd cannot be first part */ |
cb67f718 | 475 | return -EBADMSG; |
8a0e0ed9 | 476 | |
cb67f718 | 477 | n_bytes += d->memfd.size; |
2ac7c17f | 478 | last_was_memfd = true; |
cb67f718 | 479 | break; |
8a0e0ed9 | 480 | |
cb67f718 DM |
481 | case KDBUS_ITEM_FDS: { |
482 | int *f; | |
483 | unsigned j; | |
8a0e0ed9 | 484 | |
cb67f718 DM |
485 | j = l / sizeof(int); |
486 | f = realloc(fds, sizeof(int) * (n_fds + j)); | |
487 | if (!f) | |
488 | return -ENOMEM; | |
8a0e0ed9 | 489 | |
cb67f718 DM |
490 | fds = f; |
491 | memcpy(fds + n_fds, d->fds, sizeof(int) * j); | |
492 | n_fds += j; | |
493 | break; | |
494 | } | |
62b3e928 | 495 | |
cb67f718 DM |
496 | case KDBUS_ITEM_SECLABEL: |
497 | seclabel = d->str; | |
498 | break; | |
fd8d62d9 LP |
499 | } |
500 | } | |
501 | ||
2ac7c17f | 502 | if (last_was_memfd) /* memfd cannot be last part */ |
cb67f718 | 503 | return -EBADMSG; |
de297575 | 504 | |
2ac7c17f LP |
505 | if (!header) |
506 | return -EBADMSG; | |
219728b3 | 507 | |
2ac7c17f | 508 | if (header_size < sizeof(struct bus_header)) |
cb67f718 | 509 | return -EBADMSG; |
6629161f | 510 | |
cb67f718 DM |
511 | /* on kdbus we only speak native endian gvariant, never dbus1 |
512 | * marshalling or reverse endian */ | |
2ac7c17f LP |
513 | if (header->version != 2 || |
514 | header->endian != BUS_NATIVE_ENDIAN) | |
cb67f718 | 515 | return -EPROTOTYPE; |
c58dea19 | 516 | |
2ac7c17f LP |
517 | r = bus_message_from_header( |
518 | bus, | |
519 | header, header_size, | |
520 | footer, footer_size, | |
521 | n_bytes, | |
522 | fds, n_fds, | |
2ac7c17f | 523 | seclabel, 0, &m); |
cb67f718 DM |
524 | if (r < 0) |
525 | return r; | |
6629161f | 526 | |
cb67f718 DM |
527 | /* The well-known names list is different from the other |
528 | credentials. If we asked for it, but nothing is there, this | |
529 | means that the list of well-known names is simply empty, not | |
530 | that we lack any data */ | |
35460afc | 531 | |
cb67f718 | 532 | m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask; |
f08838da | 533 | |
cb67f718 DM |
534 | KDBUS_ITEM_FOREACH(d, k, items) { |
535 | size_t l; | |
6629161f | 536 | |
cb67f718 | 537 | l = d->size - offsetof(struct kdbus_item, data); |
6629161f | 538 | |
cb67f718 | 539 | switch (d->type) { |
6629161f | 540 | |
cb67f718 DM |
541 | case KDBUS_ITEM_PAYLOAD_OFF: { |
542 | size_t begin_body; | |
6629161f | 543 | |
cb67f718 | 544 | begin_body = BUS_MESSAGE_BODY_BEGIN(m); |
6629161f | 545 | |
cb67f718 DM |
546 | if (idx + d->vec.size > begin_body) { |
547 | struct bus_body_part *part; | |
a43b9ca3 | 548 | |
cb67f718 | 549 | /* Contains body material */ |
6629161f | 550 | |
cb67f718 DM |
551 | part = message_append_part(m); |
552 | if (!part) { | |
553 | r = -ENOMEM; | |
554 | goto fail; | |
555 | } | |
a43b9ca3 | 556 | |
cb67f718 DM |
557 | /* A -1 offset is NUL padding. */ |
558 | part->is_zero = d->vec.offset == ~0ULL; | |
a43b9ca3 | 559 | |
cb67f718 DM |
560 | if (idx >= begin_body) { |
561 | if (!part->is_zero) | |
2ac7c17f | 562 | part->data = (uint8_t* )k + d->vec.offset; |
cb67f718 DM |
563 | part->size = d->vec.size; |
564 | } else { | |
565 | if (!part->is_zero) | |
2ac7c17f | 566 | part->data = (uint8_t*) k + d->vec.offset + (begin_body - idx); |
cb67f718 DM |
567 | part->size = d->vec.size - (begin_body - idx); |
568 | } | |
a43b9ca3 | 569 | |
cb67f718 | 570 | part->sealed = true; |
ff4994c5 | 571 | } |
a43b9ca3 | 572 | |
cb67f718 DM |
573 | idx += d->vec.size; |
574 | break; | |
575 | } | |
a43b9ca3 | 576 | |
cb67f718 DM |
577 | case KDBUS_ITEM_PAYLOAD_MEMFD: { |
578 | struct bus_body_part *part; | |
a43b9ca3 | 579 | |
cb67f718 DM |
580 | if (idx < BUS_MESSAGE_BODY_BEGIN(m)) { |
581 | r = -EBADMSG; | |
582 | goto fail; | |
ff4994c5 | 583 | } |
a43b9ca3 | 584 | |
cb67f718 DM |
585 | part = message_append_part(m); |
586 | if (!part) { | |
587 | r = -ENOMEM; | |
588 | goto fail; | |
589 | } | |
a43b9ca3 | 590 | |
cb67f718 | 591 | part->memfd = d->memfd.fd; |
77adde63 | 592 | part->memfd_offset = d->memfd.start; |
cb67f718 DM |
593 | part->size = d->memfd.size; |
594 | part->sealed = true; | |
a43b9ca3 | 595 | |
cb67f718 DM |
596 | idx += d->memfd.size; |
597 | break; | |
598 | } | |
a43b9ca3 | 599 | |
705a415f LP |
600 | case KDBUS_ITEM_PIDS: |
601 | ||
32802361 | 602 | /* The PID/TID might be missing, when the data |
2ac7c17f LP |
603 | * is faked by a bus proxy and it lacks that |
604 | * information about the real client (since | |
605 | * SO_PEERCRED is used for that). Also kernel | |
606 | * namespacing might make some of this data | |
607 | * unavailable when untranslatable. */ | |
705a415f LP |
608 | |
609 | if (d->pids.pid > 0) { | |
610 | m->creds.pid = (pid_t) d->pids.pid; | |
611 | m->creds.mask |= SD_BUS_CREDS_PID & bus->creds_mask; | |
612 | } | |
613 | ||
705a415f LP |
614 | if (d->pids.tid > 0) { |
615 | m->creds.tid = (pid_t) d->pids.tid; | |
cb67f718 DM |
616 | m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask; |
617 | } | |
705a415f | 618 | |
1386e47d LP |
619 | if (d->pids.ppid > 0) { |
620 | m->creds.ppid = (pid_t) d->pids.ppid; | |
621 | m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask; | |
cfeaa44a LP |
622 | } else if (d->pids.pid == 1) { |
623 | m->creds.ppid = 0; | |
624 | m->creds.mask |= SD_BUS_CREDS_PPID & bus->creds_mask; | |
1386e47d LP |
625 | } |
626 | ||
705a415f LP |
627 | break; |
628 | ||
629 | case KDBUS_ITEM_CREDS: | |
630 | ||
2ac7c17f LP |
631 | /* EUID/SUID/FSUID/EGID/SGID/FSGID might be |
632 | * missing too (see above). */ | |
705a415f | 633 | |
fed1e721 | 634 | if ((uid_t) d->creds.uid != UID_INVALID) { |
705a415f LP |
635 | m->creds.uid = (uid_t) d->creds.uid; |
636 | m->creds.mask |= SD_BUS_CREDS_UID & bus->creds_mask; | |
637 | } | |
638 | ||
fed1e721 | 639 | if ((uid_t) d->creds.euid != UID_INVALID) { |
705a415f LP |
640 | m->creds.euid = (uid_t) d->creds.euid; |
641 | m->creds.mask |= SD_BUS_CREDS_EUID & bus->creds_mask; | |
642 | } | |
643 | ||
fed1e721 | 644 | if ((uid_t) d->creds.suid != UID_INVALID) { |
705a415f LP |
645 | m->creds.suid = (uid_t) d->creds.suid; |
646 | m->creds.mask |= SD_BUS_CREDS_SUID & bus->creds_mask; | |
647 | } | |
648 | ||
fed1e721 | 649 | if ((uid_t) d->creds.fsuid != UID_INVALID) { |
705a415f LP |
650 | m->creds.fsuid = (uid_t) d->creds.fsuid; |
651 | m->creds.mask |= SD_BUS_CREDS_FSUID & bus->creds_mask; | |
652 | } | |
653 | ||
fed1e721 | 654 | if ((gid_t) d->creds.gid != GID_INVALID) { |
705a415f LP |
655 | m->creds.gid = (gid_t) d->creds.gid; |
656 | m->creds.mask |= SD_BUS_CREDS_GID & bus->creds_mask; | |
657 | } | |
658 | ||
fed1e721 | 659 | if ((gid_t) d->creds.egid != GID_INVALID) { |
705a415f LP |
660 | m->creds.egid = (gid_t) d->creds.egid; |
661 | m->creds.mask |= SD_BUS_CREDS_EGID & bus->creds_mask; | |
662 | } | |
663 | ||
fed1e721 | 664 | if ((gid_t) d->creds.sgid != GID_INVALID) { |
705a415f LP |
665 | m->creds.sgid = (gid_t) d->creds.sgid; |
666 | m->creds.mask |= SD_BUS_CREDS_SGID & bus->creds_mask; | |
667 | } | |
668 | ||
fed1e721 | 669 | if ((gid_t) d->creds.fsgid != GID_INVALID) { |
705a415f LP |
670 | m->creds.fsgid = (gid_t) d->creds.fsgid; |
671 | m->creds.mask |= SD_BUS_CREDS_FSGID & bus->creds_mask; | |
672 | } | |
673 | ||
cb67f718 | 674 | break; |
6629161f | 675 | |
cb67f718 | 676 | case KDBUS_ITEM_TIMESTAMP: |
76877fb9 | 677 | message_set_timestamp(bus, m, &d->timestamp); |
cb67f718 | 678 | break; |
fd8d62d9 | 679 | |
cb67f718 DM |
680 | case KDBUS_ITEM_PID_COMM: |
681 | m->creds.comm = d->str; | |
682 | m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask; | |
683 | break; | |
fd8d62d9 | 684 | |
cb67f718 DM |
685 | case KDBUS_ITEM_TID_COMM: |
686 | m->creds.tid_comm = d->str; | |
687 | m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask; | |
688 | break; | |
6629161f | 689 | |
cb67f718 DM |
690 | case KDBUS_ITEM_EXE: |
691 | m->creds.exe = d->str; | |
692 | m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask; | |
693 | break; | |
6629161f | 694 | |
cb67f718 DM |
695 | case KDBUS_ITEM_CMDLINE: |
696 | m->creds.cmdline = d->str; | |
697 | m->creds.cmdline_size = l; | |
698 | m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask; | |
699 | break; | |
777d7a61 | 700 | |
cb67f718 DM |
701 | case KDBUS_ITEM_CGROUP: |
702 | m->creds.cgroup = d->str; | |
703 | 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 | 704 | |
fe3f22d1 DK |
705 | r = bus_get_root_path(bus); |
706 | if (r < 0) | |
707 | goto fail; | |
777d7a61 | 708 | |
cb67f718 | 709 | m->creds.cgroup_root = bus->cgroup_root; |
cb67f718 | 710 | break; |
777d7a61 | 711 | |
cb67f718 | 712 | case KDBUS_ITEM_AUDIT: |
cfeaa44a LP |
713 | m->creds.audit_session_id = (uint32_t) d->audit.sessionid; |
714 | m->creds.mask |= SD_BUS_CREDS_AUDIT_SESSION_ID & bus->creds_mask; | |
6dfcc64b | 715 | |
cfeaa44a LP |
716 | m->creds.audit_login_uid = (uid_t) d->audit.loginuid; |
717 | m->creds.mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID & bus->creds_mask; | |
cb67f718 | 718 | break; |
777d7a61 | 719 | |
cb67f718 | 720 | case KDBUS_ITEM_CAPS: |
34a5d5e5 DH |
721 | if (d->caps.last_cap != cap_last_cap() || |
722 | d->size - offsetof(struct kdbus_item, caps.caps) < DIV_ROUND_UP(d->caps.last_cap, 32U) * 4 * 4) { | |
723 | r = -EBADMSG; | |
724 | goto fail; | |
725 | } | |
726 | ||
7d9fcc2b | 727 | m->creds.capability = d->caps.caps; |
cb67f718 DM |
728 | 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; |
729 | break; | |
219728b3 | 730 | |
cb67f718 | 731 | case KDBUS_ITEM_DST_NAME: |
9f6dfd06 LP |
732 | if (!service_name_is_valid(d->str)) { |
733 | r = -EBADMSG; | |
734 | goto fail; | |
735 | } | |
219728b3 | 736 | |
cb67f718 DM |
737 | destination = d->str; |
738 | break; | |
777d7a61 | 739 | |
635f9f0d | 740 | case KDBUS_ITEM_OWNED_NAME: |
9f6dfd06 LP |
741 | if (!service_name_is_valid(d->name.name)) { |
742 | r = -EBADMSG; | |
cb67f718 | 743 | goto fail; |
9f6dfd06 LP |
744 | } |
745 | ||
746 | if (bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) { | |
50c45216 LP |
747 | char **wkn; |
748 | size_t n; | |
749 | ||
750 | /* We just extend the array here, but | |
751 | * do not allocate the strings inside | |
752 | * of it, instead we just point to our | |
753 | * buffer directly. */ | |
754 | n = strv_length(m->creds.well_known_names); | |
755 | wkn = realloc(m->creds.well_known_names, (n + 2) * sizeof(char*)); | |
756 | if (!wkn) { | |
757 | r = -ENOMEM; | |
9f6dfd06 | 758 | goto fail; |
50c45216 LP |
759 | } |
760 | ||
761 | wkn[n] = d->name.name; | |
762 | wkn[n+1] = NULL; | |
763 | m->creds.well_known_names = wkn; | |
9f6dfd06 LP |
764 | |
765 | m->creds.mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES; | |
766 | } | |
cb67f718 | 767 | break; |
777d7a61 | 768 | |
635f9f0d | 769 | case KDBUS_ITEM_CONN_DESCRIPTION: |
455971c1 LP |
770 | m->creds.description = d->str; |
771 | m->creds.mask |= SD_BUS_CREDS_DESCRIPTION & bus->creds_mask; | |
cccb0b2c LP |
772 | break; |
773 | ||
02581590 LP |
774 | case KDBUS_ITEM_AUXGROUPS: |
775 | ||
776 | if (bus->creds_mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) { | |
606303a9 DM |
777 | size_t i, n; |
778 | gid_t *g; | |
02581590 | 779 | |
606303a9 DM |
780 | n = (d->size - offsetof(struct kdbus_item, data64)) / sizeof(uint64_t); |
781 | g = new(gid_t, n); | |
782 | if (!g) { | |
783 | r = -ENOMEM; | |
784 | goto fail; | |
785 | } | |
786 | ||
787 | for (i = 0; i < n; i++) | |
788 | g[i] = d->data64[i]; | |
789 | ||
790 | m->creds.supplementary_gids = g; | |
791 | m->creds.n_supplementary_gids = n; | |
02581590 LP |
792 | m->creds.mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS; |
793 | } | |
794 | ||
795 | break; | |
796 | ||
cb67f718 DM |
797 | case KDBUS_ITEM_FDS: |
798 | case KDBUS_ITEM_SECLABEL: | |
3f624df6 | 799 | case KDBUS_ITEM_BLOOM_FILTER: |
cb67f718 | 800 | break; |
d78bf250 | 801 | |
cb67f718 DM |
802 | default: |
803 | log_debug("Got unknown field from kernel %llu", d->type); | |
804 | } | |
805 | } | |
d78bf250 | 806 | |
38ce47e2 LP |
807 | /* If we requested the list of well-known names to be appended |
808 | * and the sender had none no item for it will be | |
315a73d9 | 809 | * attached. However, this does *not* mean that the kernel |
38ce47e2 LP |
810 | * didn't want to provide this information to us. Hence, let's |
811 | * explicitly mark this information as available if it was | |
812 | * requested. */ | |
813 | m->creds.mask |= bus->creds_mask & SD_BUS_CREDS_WELL_KNOWN_NAMES; | |
814 | ||
cb67f718 DM |
815 | r = bus_message_parse_fields(m); |
816 | if (r < 0) | |
817 | goto fail; | |
777d7a61 | 818 | |
7fa934b0 | 819 | /* Refuse messages if kdbus and dbus1 cookie doesn't match up */ |
2ac7c17f | 820 | if ((uint64_t) m->header->dbus2.cookie != k->cookie) { |
7fa934b0 LP |
821 | r = -EBADMSG; |
822 | goto fail; | |
823 | } | |
824 | ||
825 | /* Refuse messages where the reply flag doesn't match up */ | |
94e15fdc | 826 | if (!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) != !!(k->flags & KDBUS_MSG_EXPECT_REPLY)) { |
7fa934b0 LP |
827 | r = -EBADMSG; |
828 | goto fail; | |
829 | } | |
830 | ||
831 | /* Refuse reply messages where the reply cookie doesn't match up */ | |
832 | if ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) && m->reply_cookie != k->cookie_reply) { | |
833 | r = -EBADMSG; | |
834 | goto fail; | |
835 | } | |
836 | ||
837 | /* Refuse messages where the autostart flag doesn't match up */ | |
94e15fdc | 838 | if (!(m->header->flags & BUS_MESSAGE_NO_AUTO_START) != !(k->flags & KDBUS_MSG_NO_AUTO_START)) { |
7fa934b0 LP |
839 | r = -EBADMSG; |
840 | goto fail; | |
841 | } | |
842 | ||
cb67f718 | 843 | /* Override information from the user header with data from the kernel */ |
7d31d924 LP |
844 | if (k->src_id == KDBUS_SRC_ID_KERNEL) |
845 | bus_message_set_sender_driver(bus, m); | |
846 | else { | |
cb67f718 DM |
847 | snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id); |
848 | m->sender = m->creds.unique_name = m->sender_buffer; | |
849 | } | |
777d7a61 | 850 | |
cb67f718 DM |
851 | if (destination) |
852 | m->destination = destination; | |
853 | else if (k->dst_id == KDBUS_DST_ID_BROADCAST) | |
854 | m->destination = NULL; | |
855 | else if (k->dst_id == KDBUS_DST_ID_NAME) | |
856 | m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */ | |
857 | else { | |
858 | snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id); | |
859 | m->destination = m->destination_buffer; | |
860 | } | |
777d7a61 | 861 | |
cb67f718 DM |
862 | /* We take possession of the kmsg struct now */ |
863 | m->kdbus = k; | |
864 | m->release_kdbus = true; | |
865 | m->free_fds = true; | |
866 | fds = NULL; | |
777d7a61 | 867 | |
cb67f718 | 868 | bus->rqueue[bus->rqueue_size++] = m; |
777d7a61 | 869 | |
cb67f718 | 870 | return 1; |
777d7a61 | 871 | |
cb67f718 | 872 | fail: |
125dd074 ZJS |
873 | unset_memfds(m); |
874 | sd_bus_message_unref(m); | |
777d7a61 | 875 | |
cb67f718 DM |
876 | return r; |
877 | } | |
777d7a61 | 878 | |
cb67f718 | 879 | int bus_kernel_take_fd(sd_bus *b) { |
d31f486b | 880 | struct kdbus_bloom_parameter *bloom = NULL; |
6ad4a4fc | 881 | struct kdbus_item *items, *item; |
cb67f718 | 882 | struct kdbus_cmd_hello *hello; |
5972fe95 LP |
883 | _cleanup_free_ char *g = NULL; |
884 | const char *name; | |
885 | size_t l = 0, m = 0, sz; | |
cb67f718 | 886 | int r; |
777d7a61 | 887 | |
cb67f718 | 888 | assert(b); |
7adc46fc | 889 | |
cb67f718 DM |
890 | if (b->is_server) |
891 | return -EINVAL; | |
777d7a61 | 892 | |
cb67f718 | 893 | b->use_memfd = 1; |
777d7a61 | 894 | |
455971c1 LP |
895 | if (b->description) { |
896 | g = bus_label_escape(b->description); | |
5972fe95 LP |
897 | if (!g) |
898 | return -ENOMEM; | |
899 | ||
900 | name = g; | |
901 | } else { | |
902 | char pr[17] = {}; | |
903 | ||
904 | /* If no name is explicitly set, we'll include a hint | |
905 | * indicating the library implementation, a hint which | |
906 | * kind of bus this is and the thread name */ | |
907 | ||
908 | assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0); | |
909 | ||
910 | if (isempty(pr)) { | |
911 | name = b->is_system ? "sd-system" : | |
912 | b->is_user ? "sd-user" : "sd"; | |
913 | } else { | |
914 | _cleanup_free_ char *e = NULL; | |
915 | ||
a6278b88 | 916 | e = bus_label_escape(pr); |
5972fe95 LP |
917 | if (!e) |
918 | return -ENOMEM; | |
919 | ||
920 | g = strappend(b->is_system ? "sd-system-" : | |
921 | b->is_user ? "sd-user-" : "sd-", | |
922 | e); | |
923 | if (!g) | |
924 | return -ENOMEM; | |
925 | ||
926 | name = g; | |
927 | } | |
928 | ||
455971c1 LP |
929 | b->description = bus_label_unescape(name); |
930 | if (!b->description) | |
5972fe95 LP |
931 | return -ENOMEM; |
932 | } | |
933 | ||
934 | m = strlen(name); | |
935 | ||
936 | sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) + | |
937 | ALIGN8(offsetof(struct kdbus_item, str) + m + 1); | |
777d7a61 | 938 | |
cb67f718 | 939 | if (b->fake_creds_valid) |
5972fe95 | 940 | sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds)); |
777d7a61 | 941 | |
705a415f LP |
942 | if (b->fake_pids_valid) |
943 | sz += ALIGN8(offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids)); | |
944 | ||
cb67f718 DM |
945 | if (b->fake_label) { |
946 | l = strlen(b->fake_label); | |
947 | sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1); | |
948 | } | |
777d7a61 | 949 | |
7f3d3ba1 | 950 | hello = alloca0_align(sz, 8); |
cb67f718 | 951 | hello->size = sz; |
bc75205c | 952 | hello->flags = b->hello_flags; |
6f5c810a | 953 | hello->attach_flags_send = _KDBUS_ATTACH_ANY; |
d704fda9 | 954 | hello->attach_flags_recv = b->attach_flags; |
cb67f718 | 955 | hello->pool_size = KDBUS_POOL_SIZE; |
777d7a61 | 956 | |
cb67f718 DM |
957 | item = hello->items; |
958 | ||
5972fe95 | 959 | item->size = offsetof(struct kdbus_item, str) + m + 1; |
635f9f0d | 960 | item->type = KDBUS_ITEM_CONN_DESCRIPTION; |
5972fe95 LP |
961 | memcpy(item->str, name, m + 1); |
962 | item = KDBUS_ITEM_NEXT(item); | |
963 | ||
cb67f718 DM |
964 | if (b->fake_creds_valid) { |
965 | item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds); | |
966 | item->type = KDBUS_ITEM_CREDS; | |
967 | item->creds = b->fake_creds; | |
968 | ||
969 | item = KDBUS_ITEM_NEXT(item); | |
777d7a61 LP |
970 | } |
971 | ||
705a415f LP |
972 | if (b->fake_pids_valid) { |
973 | item->size = offsetof(struct kdbus_item, pids) + sizeof(struct kdbus_pids); | |
974 | item->type = KDBUS_ITEM_PIDS; | |
975 | item->pids = b->fake_pids; | |
976 | ||
977 | item = KDBUS_ITEM_NEXT(item); | |
978 | } | |
979 | ||
cb67f718 DM |
980 | if (b->fake_label) { |
981 | item->size = offsetof(struct kdbus_item, str) + l + 1; | |
5972fe95 | 982 | item->type = KDBUS_ITEM_SECLABEL; |
cb67f718 | 983 | memcpy(item->str, b->fake_label, l+1); |
777d7a61 LP |
984 | } |
985 | ||
cb67f718 | 986 | r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello); |
524d896a LP |
987 | if (r < 0) { |
988 | if (errno == ENOTTY) | |
989 | /* If the ioctl is not supported we assume that the | |
990 | * API version changed in a major incompatible way, | |
991 | * let's indicate an API incompatibility in this | |
992 | * case. */ | |
993 | return -ESOCKTNOSUPPORT; | |
994 | ||
cb67f718 | 995 | return -errno; |
524d896a | 996 | } |
777d7a61 | 997 | |
cb67f718 DM |
998 | if (!b->kdbus_buffer) { |
999 | b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0); | |
1000 | if (b->kdbus_buffer == MAP_FAILED) { | |
1001 | b->kdbus_buffer = NULL; | |
d31f486b DH |
1002 | r = -errno; |
1003 | goto fail; | |
cb67f718 DM |
1004 | } |
1005 | } | |
6629161f | 1006 | |
4a3e79e1 | 1007 | /* The higher 32bit of the bus_flags fields are considered |
cb67f718 | 1008 | * 'incompatible flags'. Refuse them all for now. */ |
d31f486b | 1009 | if (hello->bus_flags > 0xFFFFFFFFULL) { |
524d896a | 1010 | r = -ESOCKTNOSUPPORT; |
d31f486b DH |
1011 | goto fail; |
1012 | } | |
6629161f | 1013 | |
d31f486b DH |
1014 | /* extract bloom parameters from items */ |
1015 | items = (void*)((uint8_t*)b->kdbus_buffer + hello->offset); | |
6ad4a4fc | 1016 | KDBUS_FOREACH(item, items, hello->items_size) { |
d31f486b DH |
1017 | switch (item->type) { |
1018 | case KDBUS_ITEM_BLOOM_PARAMETER: | |
1019 | bloom = &item->bloom_parameter; | |
1020 | break; | |
1021 | } | |
1022 | } | |
6629161f | 1023 | |
d31f486b | 1024 | if (!bloom || !bloom_validate_parameters((size_t) bloom->size, (unsigned) bloom->n_hash)) { |
15411c0c | 1025 | r = -EOPNOTSUPP; |
d31f486b DH |
1026 | goto fail; |
1027 | } | |
b28ff39f | 1028 | |
d31f486b DH |
1029 | b->bloom_size = (size_t) bloom->size; |
1030 | b->bloom_n_hash = (unsigned) bloom->n_hash; | |
1031 | ||
1032 | if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) { | |
1033 | r = -ENOMEM; | |
1034 | goto fail; | |
1035 | } | |
6629161f | 1036 | |
cb67f718 | 1037 | b->unique_id = hello->id; |
6629161f | 1038 | |
cb67f718 DM |
1039 | b->is_kernel = true; |
1040 | b->bus_client = true; | |
bc75205c | 1041 | b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD); |
cb67f718 DM |
1042 | b->message_version = 2; |
1043 | b->message_endian = BUS_NATIVE_ENDIAN; | |
c91cb83c | 1044 | |
cb67f718 DM |
1045 | /* the kernel told us the UUID of the underlying bus */ |
1046 | memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes)); | |
6629161f | 1047 | |
d31f486b DH |
1048 | /* free returned items */ |
1049 | (void) bus_kernel_cmd_free(b, hello->offset); | |
cb67f718 | 1050 | return bus_start_running(b); |
d31f486b DH |
1051 | |
1052 | fail: | |
72e61104 | 1053 | (void) bus_kernel_cmd_free(b, hello->offset); |
d31f486b | 1054 | return r; |
cb67f718 | 1055 | } |
6629161f | 1056 | |
cb67f718 DM |
1057 | int bus_kernel_connect(sd_bus *b) { |
1058 | assert(b); | |
1059 | assert(b->input_fd < 0); | |
1060 | assert(b->output_fd < 0); | |
1061 | assert(b->kernel); | |
1307c3ff | 1062 | |
cb67f718 DM |
1063 | if (b->is_server) |
1064 | return -EINVAL; | |
1307c3ff | 1065 | |
cb67f718 DM |
1066 | b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC); |
1067 | if (b->input_fd < 0) | |
1068 | return -errno; | |
6629161f | 1069 | |
cb67f718 | 1070 | b->output_fd = b->input_fd; |
6629161f | 1071 | |
cb67f718 DM |
1072 | return bus_kernel_take_fd(b); |
1073 | } | |
f9be01f3 | 1074 | |
52cfc037 LP |
1075 | int bus_kernel_cmd_free(sd_bus *bus, uint64_t offset) { |
1076 | struct kdbus_cmd_free cmd = { | |
d31f486b | 1077 | .size = sizeof(cmd), |
52cfc037 LP |
1078 | .offset = offset, |
1079 | }; | |
1080 | int r; | |
1081 | ||
1082 | assert(bus); | |
1083 | assert(bus->is_kernel); | |
1084 | ||
1085 | r = ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd); | |
1086 | if (r < 0) | |
1087 | return -errno; | |
1088 | ||
1089 | return 0; | |
1090 | } | |
1091 | ||
069f5e61 | 1092 | static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { |
069f5e61 LP |
1093 | struct kdbus_item *d; |
1094 | ||
1095 | assert(bus); | |
1096 | assert(k); | |
1097 | ||
069f5e61 | 1098 | KDBUS_ITEM_FOREACH(d, k, items) { |
069f5e61 LP |
1099 | if (d->type == KDBUS_ITEM_FDS) |
1100 | close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int)); | |
1101 | else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD) | |
03e334a1 | 1102 | safe_close(d->memfd.fd); |
069f5e61 | 1103 | } |
ca794c8e | 1104 | |
52cfc037 | 1105 | bus_kernel_cmd_free(bus, (uint8_t*) k - (uint8_t*) bus->kdbus_buffer); |
069f5e61 LP |
1106 | } |
1107 | ||
1108 | int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) { | |
94e15fdc | 1109 | struct kdbus_cmd_send cmd = { }; |
cb67f718 | 1110 | int r; |
6629161f | 1111 | |
cb67f718 DM |
1112 | assert(bus); |
1113 | assert(m); | |
1114 | assert(bus->state == BUS_RUNNING); | |
6629161f | 1115 | |
cb67f718 DM |
1116 | /* If we can't deliver, we want room for the error message */ |
1117 | r = bus_rqueue_make_room(bus); | |
6629161f LP |
1118 | if (r < 0) |
1119 | return r; | |
1120 | ||
cb67f718 | 1121 | r = bus_message_setup_kmsg(bus, m); |
6629161f LP |
1122 | if (r < 0) |
1123 | return r; | |
1124 | ||
94e15fdc DH |
1125 | cmd.size = sizeof(cmd); |
1126 | cmd.msg_address = (uintptr_t)m->kdbus; | |
1127 | ||
069f5e61 LP |
1128 | /* If this is a synchronous method call, then let's tell the |
1129 | * kernel, so that it can pass CPU time/scheduling to the | |
1130 | * destination for the time, if it wants to. If we | |
1131 | * synchronously wait for the result anyway, we won't need CPU | |
1132 | * anyway. */ | |
94e15fdc DH |
1133 | if (hint_sync_call) { |
1134 | m->kdbus->flags |= KDBUS_MSG_EXPECT_REPLY; | |
1135 | cmd.flags |= KDBUS_SEND_SYNC_REPLY; | |
1136 | } | |
069f5e61 | 1137 | |
94e15fdc | 1138 | r = ioctl(bus->output_fd, KDBUS_CMD_SEND, &cmd); |
cb67f718 DM |
1139 | if (r < 0) { |
1140 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
1141 | sd_bus_message *reply; | |
253ce82b | 1142 | |
cb67f718 DM |
1143 | if (errno == EAGAIN || errno == EINTR) |
1144 | return 0; | |
1145 | else if (errno == ENXIO || errno == ESRCH) { | |
6629161f | 1146 | |
cb67f718 DM |
1147 | /* ENXIO: unique name not known |
1148 | * ESRCH: well-known name not known */ | |
6629161f | 1149 | |
cb67f718 DM |
1150 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
1151 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination); | |
1152 | else { | |
1153 | log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination); | |
1154 | return 0; | |
1155 | } | |
777d7a61 | 1156 | |
cb67f718 | 1157 | } else if (errno == EADDRNOTAVAIL) { |
fd8d62d9 | 1158 | |
cb67f718 | 1159 | /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */ |
bc7fd8cd | 1160 | |
cb67f718 DM |
1161 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
1162 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination); | |
1163 | else { | |
1164 | log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination); | |
1165 | return 0; | |
1166 | } | |
1167 | } else | |
1168 | return -errno; | |
bc7fd8cd | 1169 | |
cb67f718 DM |
1170 | r = bus_message_new_synthetic_error( |
1171 | bus, | |
1172 | BUS_MESSAGE_COOKIE(m), | |
1173 | &error, | |
1174 | &reply); | |
bc7fd8cd | 1175 | |
cb67f718 DM |
1176 | if (r < 0) |
1177 | return r; | |
bc7fd8cd | 1178 | |
cb67f718 DM |
1179 | r = bus_seal_synthetic_message(bus, reply); |
1180 | if (r < 0) | |
1181 | return r; | |
62b3e928 | 1182 | |
cb67f718 | 1183 | bus->rqueue[bus->rqueue_size++] = reply; |
bc7fd8cd | 1184 | |
069f5e61 LP |
1185 | } else if (hint_sync_call) { |
1186 | struct kdbus_msg *k; | |
fd8d62d9 | 1187 | |
94e15fdc | 1188 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + cmd.reply.offset); |
069f5e61 | 1189 | assert(k); |
777d7a61 | 1190 | |
069f5e61 | 1191 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
1307c3ff | 1192 | |
069f5e61 LP |
1193 | r = bus_kernel_make_message(bus, k); |
1194 | if (r < 0) { | |
1195 | close_kdbus_msg(bus, k); | |
1307c3ff | 1196 | |
069f5e61 LP |
1197 | /* Anybody can send us invalid messages, let's just drop them. */ |
1198 | if (r == -EBADMSG || r == -EPROTOTYPE) | |
b267a6d2 | 1199 | log_debug_errno(r, "Ignoring invalid synchronous reply: %m"); |
069f5e61 LP |
1200 | else |
1201 | return r; | |
1202 | } | |
1203 | } else { | |
1204 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
1205 | close_kdbus_msg(bus, k); | |
1206 | } | |
cb67f718 | 1207 | } |
069f5e61 LP |
1208 | |
1209 | return 1; | |
cb67f718 | 1210 | } |
69aec65c | 1211 | |
76877fb9 LP |
1212 | static int push_name_owner_changed( |
1213 | sd_bus *bus, | |
1214 | const char *name, | |
1215 | const char *old_owner, | |
1216 | const char *new_owner, | |
1217 | const struct kdbus_timestamp *ts) { | |
1218 | ||
cb67f718 DM |
1219 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
1220 | int r; | |
2dc9970b | 1221 | |
cb67f718 | 1222 | assert(bus); |
2dc9970b | 1223 | |
cb67f718 DM |
1224 | r = sd_bus_message_new_signal( |
1225 | bus, | |
151b9b96 | 1226 | &m, |
cb67f718 DM |
1227 | "/org/freedesktop/DBus", |
1228 | "org.freedesktop.DBus", | |
151b9b96 | 1229 | "NameOwnerChanged"); |
cb67f718 DM |
1230 | if (r < 0) |
1231 | return r; | |
2dc9970b | 1232 | |
cb67f718 DM |
1233 | r = sd_bus_message_append(m, "sss", name, old_owner, new_owner); |
1234 | if (r < 0) | |
1235 | return r; | |
5b12334d | 1236 | |
7d31d924 | 1237 | bus_message_set_sender_driver(bus, m); |
76877fb9 | 1238 | message_set_timestamp(bus, m, ts); |
5b12334d | 1239 | |
cb67f718 DM |
1240 | r = bus_seal_synthetic_message(bus, m); |
1241 | if (r < 0) | |
1242 | return r; | |
5b12334d | 1243 | |
cb67f718 DM |
1244 | bus->rqueue[bus->rqueue_size++] = m; |
1245 | m = NULL; | |
5b12334d | 1246 | |
cb67f718 DM |
1247 | return 1; |
1248 | } | |
5b12334d | 1249 | |
76877fb9 LP |
1250 | static int translate_name_change( |
1251 | sd_bus *bus, | |
1252 | const struct kdbus_msg *k, | |
1253 | const struct kdbus_item *d, | |
1254 | const struct kdbus_timestamp *ts) { | |
1255 | ||
cb67f718 | 1256 | char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX]; |
5b12334d | 1257 | |
cb67f718 DM |
1258 | assert(bus); |
1259 | assert(k); | |
1260 | assert(d); | |
751bc6ac | 1261 | |
619d7a03 | 1262 | if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) |
cb67f718 DM |
1263 | old_owner[0] = 0; |
1264 | else | |
619d7a03 | 1265 | sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id); |
751bc6ac | 1266 | |
619d7a03 | 1267 | if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) { |
751bc6ac | 1268 | |
cb67f718 DM |
1269 | if (isempty(old_owner)) |
1270 | return 0; | |
5b12334d | 1271 | |
cb67f718 DM |
1272 | new_owner[0] = 0; |
1273 | } else | |
619d7a03 | 1274 | sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id); |
5b12334d | 1275 | |
76877fb9 | 1276 | return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner, ts); |
cb67f718 | 1277 | } |
5b12334d | 1278 | |
76877fb9 LP |
1279 | static int translate_id_change( |
1280 | sd_bus *bus, | |
1281 | const struct kdbus_msg *k, | |
1282 | const struct kdbus_item *d, | |
1283 | const struct kdbus_timestamp *ts) { | |
1284 | ||
cb67f718 | 1285 | char owner[UNIQUE_NAME_MAX]; |
2e2ec0ea | 1286 | |
cb67f718 DM |
1287 | assert(bus); |
1288 | assert(k); | |
1289 | assert(d); | |
777d7a61 | 1290 | |
cb67f718 | 1291 | sprintf(owner, ":1.%llu", d->id_change.id); |
2e2ec0ea | 1292 | |
cb67f718 DM |
1293 | return push_name_owner_changed( |
1294 | bus, owner, | |
1295 | d->type == KDBUS_ITEM_ID_ADD ? NULL : owner, | |
76877fb9 LP |
1296 | d->type == KDBUS_ITEM_ID_ADD ? owner : NULL, |
1297 | ts); | |
cb67f718 | 1298 | } |
49b832c5 | 1299 | |
76877fb9 LP |
1300 | static int translate_reply( |
1301 | sd_bus *bus, | |
1302 | const struct kdbus_msg *k, | |
1303 | const struct kdbus_item *d, | |
1304 | const struct kdbus_timestamp *ts) { | |
1305 | ||
cb67f718 DM |
1306 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
1307 | int r; | |
777d7a61 | 1308 | |
cb67f718 DM |
1309 | assert(bus); |
1310 | assert(k); | |
1311 | assert(d); | |
acb5a3cb | 1312 | |
cb67f718 DM |
1313 | r = bus_message_new_synthetic_error( |
1314 | bus, | |
1315 | k->cookie_reply, | |
1316 | d->type == KDBUS_ITEM_REPLY_TIMEOUT ? | |
1317 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") : | |
1318 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"), | |
1319 | &m); | |
1307c3ff | 1320 | if (r < 0) |
cb67f718 | 1321 | return r; |
51038c03 | 1322 | |
76877fb9 | 1323 | message_set_timestamp(bus, m, ts); |
51038c03 | 1324 | |
cb67f718 DM |
1325 | r = bus_seal_synthetic_message(bus, m); |
1326 | if (r < 0) | |
1327 | return r; | |
6629161f | 1328 | |
7adc46fc | 1329 | bus->rqueue[bus->rqueue_size++] = m; |
cb67f718 | 1330 | m = NULL; |
7d22c717 | 1331 | |
6629161f | 1332 | return 1; |
cb67f718 | 1333 | } |
1307c3ff | 1334 | |
cb67f718 | 1335 | static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) { |
76877fb9 | 1336 | static int (* const translate[])(sd_bus *bus, const struct kdbus_msg *k, const struct kdbus_item *d, const struct kdbus_timestamp *ts) = { |
cb67f718 DM |
1337 | [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, |
1338 | [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1339 | [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1307c3ff | 1340 | |
cb67f718 DM |
1341 | [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, |
1342 | [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, | |
1343 | ||
1344 | [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1345 | [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1346 | }; | |
1347 | ||
76877fb9 LP |
1348 | struct kdbus_item *d, *found = NULL; |
1349 | struct kdbus_timestamp *ts = NULL; | |
1350 | ||
cb67f718 DM |
1351 | assert(bus); |
1352 | assert(k); | |
1353 | assert(k->payload_type == KDBUS_PAYLOAD_KERNEL); | |
1354 | ||
1355 | KDBUS_ITEM_FOREACH(d, k, items) { | |
856d6e09 | 1356 | if (d->type == KDBUS_ITEM_TIMESTAMP) |
76877fb9 | 1357 | ts = &d->timestamp; |
95cdf5e3 | 1358 | else if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) { |
cb67f718 DM |
1359 | if (found) |
1360 | return -EBADMSG; | |
1361 | found = d; | |
1362 | } else | |
1363 | log_debug("Got unknown field from kernel %llu", d->type); | |
1307c3ff LP |
1364 | } |
1365 | ||
cb67f718 DM |
1366 | if (!found) { |
1367 | log_debug("Didn't find a kernel message to translate."); | |
1368 | return 0; | |
1369 | } | |
1370 | ||
76877fb9 | 1371 | return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found, ts); |
6629161f LP |
1372 | } |
1373 | ||
766c5809 | 1374 | int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) { |
94e15fdc | 1375 | struct kdbus_cmd_recv recv = { .size = sizeof(recv) }; |
6629161f | 1376 | struct kdbus_msg *k; |
6629161f LP |
1377 | int r; |
1378 | ||
1379 | assert(bus); | |
7d22c717 | 1380 | |
7adc46fc | 1381 | r = bus_rqueue_make_room(bus); |
7d22c717 LP |
1382 | if (r < 0) |
1383 | return r; | |
6629161f | 1384 | |
766c5809 LP |
1385 | if (hint_priority) { |
1386 | recv.flags |= KDBUS_RECV_USE_PRIORITY; | |
1387 | recv.priority = priority; | |
1388 | } | |
1389 | ||
94e15fdc | 1390 | r = ioctl(bus->input_fd, KDBUS_CMD_RECV, &recv); |
83e30358 DH |
1391 | if (recv.return_flags & KDBUS_RECV_RETURN_DROPPED_MSGS) |
1392 | log_debug("%s: kdbus reports %" PRIu64 " dropped broadcast messages, ignoring.", strna(bus->description), (uint64_t) recv.dropped_msgs); | |
fd8d62d9 | 1393 | if (r < 0) { |
6629161f LP |
1394 | if (errno == EAGAIN) |
1395 | return 0; | |
1396 | ||
fd8d62d9 | 1397 | return -errno; |
6629161f LP |
1398 | } |
1399 | ||
a9c8343e | 1400 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.msg.offset); |
e1d337d4 | 1401 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
7d22c717 | 1402 | r = bus_kernel_make_message(bus, k); |
e1d337d4 LP |
1403 | |
1404 | /* Anybody can send us invalid messages, let's just drop them. */ | |
1405 | if (r == -EBADMSG || r == -EPROTOTYPE) { | |
da927ba9 | 1406 | log_debug_errno(r, "Ignoring invalid message: %m"); |
e1d337d4 LP |
1407 | r = 0; |
1408 | } | |
1409 | ||
0c9cc10d DH |
1410 | if (r <= 0) |
1411 | close_kdbus_msg(bus, k); | |
1412 | } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) { | |
7d22c717 | 1413 | r = bus_kernel_translate_message(bus, k); |
0c9cc10d DH |
1414 | close_kdbus_msg(bus, k); |
1415 | } else { | |
069f5e61 | 1416 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); |
777d7a61 | 1417 | r = 0; |
fd8d62d9 | 1418 | close_kdbus_msg(bus, k); |
0c9cc10d | 1419 | } |
6629161f | 1420 | |
51038c03 | 1421 | return r < 0 ? r : 1; |
6629161f LP |
1422 | } |
1423 | ||
8e959fbf | 1424 | int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) { |
bc7fd8cd | 1425 | struct memfd_cache *c; |
45fbe937 | 1426 | int fd; |
bc7fd8cd LP |
1427 | |
1428 | assert(address); | |
8e959fbf LP |
1429 | assert(mapped); |
1430 | assert(allocated); | |
35460afc LP |
1431 | |
1432 | if (!bus || !bus->is_kernel) | |
15411c0c | 1433 | return -EOPNOTSUPP; |
bc7fd8cd | 1434 | |
76b7742c | 1435 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
45fbe937 | 1436 | |
bc7fd8cd | 1437 | if (bus->n_memfd_cache <= 0) { |
45fbe937 LP |
1438 | int r; |
1439 | ||
76b7742c | 1440 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1441 | |
455971c1 | 1442 | r = memfd_new(bus->description); |
9b05bc48 | 1443 | if (r < 0) |
73843b52 | 1444 | return r; |
bc7fd8cd LP |
1445 | |
1446 | *address = NULL; | |
8e959fbf LP |
1447 | *mapped = 0; |
1448 | *allocated = 0; | |
a6082d77 | 1449 | return r; |
bc7fd8cd LP |
1450 | } |
1451 | ||
bf30e48f | 1452 | c = &bus->memfd_cache[--bus->n_memfd_cache]; |
bc7fd8cd LP |
1453 | |
1454 | assert(c->fd >= 0); | |
8e959fbf | 1455 | assert(c->mapped == 0 || c->address); |
bc7fd8cd LP |
1456 | |
1457 | *address = c->address; | |
8e959fbf LP |
1458 | *mapped = c->mapped; |
1459 | *allocated = c->allocated; | |
45fbe937 LP |
1460 | fd = c->fd; |
1461 | ||
76b7742c | 1462 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1463 | |
45fbe937 LP |
1464 | return fd; |
1465 | } | |
1466 | ||
1467 | static void close_and_munmap(int fd, void *address, size_t size) { | |
1468 | if (size > 0) | |
76b7742c | 1469 | assert_se(munmap(address, PAGE_ALIGN(size)) >= 0); |
45fbe937 | 1470 | |
03e334a1 | 1471 | safe_close(fd); |
bc7fd8cd LP |
1472 | } |
1473 | ||
8e959fbf | 1474 | void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) { |
bc7fd8cd | 1475 | struct memfd_cache *c; |
8e959fbf | 1476 | uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX); |
bc7fd8cd LP |
1477 | |
1478 | assert(fd >= 0); | |
8e959fbf | 1479 | assert(mapped == 0 || address); |
bc7fd8cd | 1480 | |
45fbe937 | 1481 | if (!bus || !bus->is_kernel) { |
8e959fbf | 1482 | close_and_munmap(fd, address, mapped); |
45fbe937 LP |
1483 | return; |
1484 | } | |
1485 | ||
76b7742c | 1486 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1487 | |
45fbe937 | 1488 | if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) { |
76b7742c | 1489 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1490 | |
8e959fbf | 1491 | close_and_munmap(fd, address, mapped); |
bc7fd8cd LP |
1492 | return; |
1493 | } | |
1494 | ||
1495 | c = &bus->memfd_cache[bus->n_memfd_cache++]; | |
1496 | c->fd = fd; | |
1497 | c->address = address; | |
1498 | ||
1499 | /* If overly long, let's return a bit to the OS */ | |
8e959fbf | 1500 | if (mapped > max_mapped) { |
73843b52 | 1501 | assert_se(memfd_set_size(fd, max_mapped) >= 0); |
8e959fbf LP |
1502 | assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0); |
1503 | c->mapped = c->allocated = max_mapped; | |
1504 | } else { | |
1505 | c->mapped = mapped; | |
1506 | c->allocated = allocated; | |
1507 | } | |
45fbe937 | 1508 | |
76b7742c | 1509 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd LP |
1510 | } |
1511 | ||
1512 | void bus_kernel_flush_memfd(sd_bus *b) { | |
1513 | unsigned i; | |
1514 | ||
1515 | assert(b); | |
1516 | ||
76b7742c | 1517 | for (i = 0; i < b->n_memfd_cache; i++) |
8e959fbf | 1518 | close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped); |
bc7fd8cd | 1519 | } |
0253ddcc | 1520 | |
b5dae4c7 | 1521 | uint64_t request_name_flags_to_kdbus(uint64_t flags) { |
e3dd987c | 1522 | uint64_t f = 0; |
0253ddcc | 1523 | |
e3dd987c LP |
1524 | if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT) |
1525 | f |= KDBUS_NAME_ALLOW_REPLACEMENT; | |
0253ddcc | 1526 | |
e3dd987c LP |
1527 | if (flags & SD_BUS_NAME_REPLACE_EXISTING) |
1528 | f |= KDBUS_NAME_REPLACE_EXISTING; | |
0253ddcc | 1529 | |
d90bb669 | 1530 | if (flags & SD_BUS_NAME_QUEUE) |
e3dd987c | 1531 | f |= KDBUS_NAME_QUEUE; |
0253ddcc | 1532 | |
b5dae4c7 | 1533 | return f; |
e3dd987c LP |
1534 | } |
1535 | ||
b5dae4c7 | 1536 | uint64_t attach_flags_to_kdbus(uint64_t mask) { |
e3dd987c LP |
1537 | uint64_t m = 0; |
1538 | ||
705a415f LP |
1539 | if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID| |
1540 | SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID)) | |
e3dd987c LP |
1541 | m |= KDBUS_ATTACH_CREDS; |
1542 | ||
1386e47d | 1543 | if (mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID|SD_BUS_CREDS_PPID)) |
705a415f LP |
1544 | m |= KDBUS_ATTACH_PIDS; |
1545 | ||
a2243d54 DM |
1546 | if (mask & SD_BUS_CREDS_COMM) |
1547 | m |= KDBUS_ATTACH_PID_COMM; | |
1548 | ||
1549 | if (mask & SD_BUS_CREDS_TID_COMM) | |
1550 | m |= KDBUS_ATTACH_TID_COMM; | |
e3dd987c LP |
1551 | |
1552 | if (mask & SD_BUS_CREDS_EXE) | |
1553 | m |= KDBUS_ATTACH_EXE; | |
1554 | ||
1555 | if (mask & SD_BUS_CREDS_CMDLINE) | |
1556 | m |= KDBUS_ATTACH_CMDLINE; | |
1557 | ||
1558 | 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)) | |
1559 | m |= KDBUS_ATTACH_CGROUP; | |
1560 | ||
1561 | if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) | |
1562 | m |= KDBUS_ATTACH_CAPS; | |
1563 | ||
1564 | if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) | |
1565 | m |= KDBUS_ATTACH_SECLABEL; | |
0253ddcc | 1566 | |
e3dd987c LP |
1567 | if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) |
1568 | m |= KDBUS_ATTACH_AUDIT; | |
1569 | ||
49b832c5 LP |
1570 | if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) |
1571 | m |= KDBUS_ATTACH_NAMES; | |
1572 | ||
455971c1 | 1573 | if (mask & SD_BUS_CREDS_DESCRIPTION) |
635f9f0d | 1574 | m |= KDBUS_ATTACH_CONN_DESCRIPTION; |
cccb0b2c | 1575 | |
02581590 LP |
1576 | if (mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) |
1577 | m |= KDBUS_ATTACH_AUXGROUPS; | |
1578 | ||
b5dae4c7 | 1579 | return m; |
0253ddcc | 1580 | } |
e3dd987c | 1581 | |
f2769777 | 1582 | int bus_kernel_create_bus(const char *name, bool world, char **s) { |
b2086f60 | 1583 | struct kdbus_cmd *make; |
e3dd987c | 1584 | struct kdbus_item *n; |
fa7796e9 | 1585 | size_t l; |
e3dd987c LP |
1586 | int fd; |
1587 | ||
1588 | assert(name); | |
1589 | assert(s); | |
1590 | ||
63cc4c31 | 1591 | fd = open("/sys/fs/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); |
e3dd987c LP |
1592 | if (fd < 0) |
1593 | return -errno; | |
1594 | ||
fa7796e9 | 1595 | l = strlen(name); |
b2086f60 | 1596 | make = alloca0_align(offsetof(struct kdbus_cmd, items) + |
fa7796e9 LP |
1597 | ALIGN8(offsetof(struct kdbus_item, bloom_parameter) + sizeof(struct kdbus_bloom_parameter)) + |
1598 | ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)) + | |
1599 | ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + l + 1), | |
7f3d3ba1 | 1600 | 8); |
e3dd987c | 1601 | |
b2086f60 | 1602 | make->size = offsetof(struct kdbus_cmd, items); |
816a3f9e | 1603 | |
fa7796e9 | 1604 | /* Set the bloom parameters */ |
e3dd987c | 1605 | n = make->items; |
18a28147 KS |
1606 | n->size = offsetof(struct kdbus_item, bloom_parameter) + |
1607 | sizeof(struct kdbus_bloom_parameter); | |
1608 | n->type = KDBUS_ITEM_BLOOM_PARAMETER; | |
b28ff39f LP |
1609 | n->bloom_parameter.size = DEFAULT_BLOOM_SIZE; |
1610 | n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH; | |
1611 | ||
1612 | assert_cc(DEFAULT_BLOOM_SIZE > 0); | |
1613 | assert_cc(DEFAULT_BLOOM_N_HASH > 0); | |
1614 | ||
816a3f9e DM |
1615 | make->size += ALIGN8(n->size); |
1616 | ||
19ee32dc DH |
1617 | /* Provide all metadata via bus-owner queries */ |
1618 | n = KDBUS_ITEM_NEXT(n); | |
1619 | n->type = KDBUS_ITEM_ATTACH_FLAGS_SEND; | |
1620 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); | |
fa7796e9 LP |
1621 | n->data64[0] = _KDBUS_ATTACH_ANY; |
1622 | make->size += ALIGN8(n->size); | |
1623 | ||
1624 | /* Set the a good name */ | |
816a3f9e | 1625 | n = KDBUS_ITEM_NEXT(n); |
a4152e3f | 1626 | sprintf(n->str, UID_FMT "-%s", getuid(), name); |
e3dd987c | 1627 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; |
5e16c257 | 1628 | n->type = KDBUS_ITEM_MAKE_NAME; |
816a3f9e | 1629 | make->size += ALIGN8(n->size); |
e3dd987c | 1630 | |
f7c7cd03 | 1631 | make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0; |
e3dd987c LP |
1632 | |
1633 | if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { | |
03e334a1 | 1634 | safe_close(fd); |
524d896a LP |
1635 | |
1636 | /* Major API change? then the ioctls got shuffled around. */ | |
1637 | if (errno == ENOTTY) | |
1638 | return -ESOCKTNOSUPPORT; | |
1639 | ||
e3dd987c LP |
1640 | return -errno; |
1641 | } | |
1642 | ||
1643 | if (s) { | |
1644 | char *p; | |
1645 | ||
63cc4c31 | 1646 | p = strjoin("/sys/fs/kdbus/", n->str, "/bus", NULL); |
e3dd987c | 1647 | if (!p) { |
03e334a1 | 1648 | safe_close(fd); |
e3dd987c LP |
1649 | return -ENOMEM; |
1650 | } | |
1651 | ||
1652 | *s = p; | |
1653 | } | |
1654 | ||
1655 | return fd; | |
1656 | } | |
9bd37b40 | 1657 | |
8f077bf9 | 1658 | int bus_kernel_open_bus_fd(const char *bus, char **path) { |
a4152e3f LP |
1659 | char *p; |
1660 | int fd; | |
8f077bf9 | 1661 | size_t len; |
1683342a | 1662 | |
8aee3fc7 LP |
1663 | assert(bus); |
1664 | ||
63cc4c31 | 1665 | len = strlen("/sys/fs/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1; |
8f077bf9 ZJS |
1666 | |
1667 | if (path) { | |
8aee3fc7 | 1668 | p = new(char, len); |
8f077bf9 ZJS |
1669 | if (!p) |
1670 | return -ENOMEM; | |
8f077bf9 | 1671 | } else |
8aee3fc7 LP |
1672 | p = newa(char, len); |
1673 | ||
63cc4c31 | 1674 | sprintf(p, "/sys/fs/kdbus/" UID_FMT "-%s/bus", getuid(), bus); |
1683342a | 1675 | |
a4152e3f | 1676 | fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); |
8aee3fc7 LP |
1677 | if (fd < 0) { |
1678 | if (path) | |
1679 | free(p); | |
1680 | ||
a4152e3f | 1681 | return -errno; |
8aee3fc7 LP |
1682 | } |
1683 | ||
1684 | if (path) | |
1685 | *path = p; | |
a4152e3f LP |
1686 | |
1687 | return fd; | |
1683342a DM |
1688 | } |
1689 | ||
e7d718af | 1690 | int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) { |
8e00bfc2 | 1691 | _cleanup_free_ char *path = NULL; |
b2086f60 | 1692 | struct kdbus_cmd *make; |
e7d718af | 1693 | struct kdbus_item *n; |
342f3005 | 1694 | const char *name; |
e7d718af DM |
1695 | int fd; |
1696 | ||
1697 | fd = bus_kernel_open_bus_fd(bus_name, &path); | |
1698 | if (fd < 0) | |
1699 | return fd; | |
1700 | ||
b2086f60 | 1701 | make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd, items)) + |
342f3005 DH |
1702 | ALIGN8(offsetof(struct kdbus_item, str) + DECIMAL_STR_MAX(uid_t) + 1 + strlen(ep_name) + 1), |
1703 | 8); | |
b2086f60 | 1704 | make->size = ALIGN8(offsetof(struct kdbus_cmd, items)); |
e7d718af DM |
1705 | make->flags = KDBUS_MAKE_ACCESS_WORLD; |
1706 | ||
1707 | n = make->items; | |
342f3005 DH |
1708 | sprintf(n->str, UID_FMT "-%s", getuid(), ep_name); |
1709 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
e7d718af | 1710 | n->type = KDBUS_ITEM_MAKE_NAME; |
342f3005 DH |
1711 | make->size += ALIGN8(n->size); |
1712 | name = n->str; | |
e7d718af | 1713 | |
40885bb2 | 1714 | if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) { |
e7d718af DM |
1715 | safe_close(fd); |
1716 | return -errno; | |
1717 | } | |
1718 | ||
e7d718af | 1719 | if (ep_path) { |
2c652b6b LP |
1720 | char *p; |
1721 | ||
342f3005 | 1722 | p = strjoin(dirname(path), "/", name, NULL); |
2c652b6b | 1723 | if (!p) { |
4edf33d1 | 1724 | safe_close(fd); |
e7d718af | 1725 | return -ENOMEM; |
4edf33d1 | 1726 | } |
2c652b6b LP |
1727 | |
1728 | *ep_path = p; | |
e7d718af DM |
1729 | } |
1730 | ||
1731 | return fd; | |
1732 | } | |
1733 | ||
ae095f86 | 1734 | int bus_kernel_try_close(sd_bus *bus) { |
b2086f60 DH |
1735 | struct kdbus_cmd byebye = { .size = sizeof(byebye) }; |
1736 | ||
ae095f86 LP |
1737 | assert(bus); |
1738 | assert(bus->is_kernel); | |
1739 | ||
b2086f60 | 1740 | if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE, &byebye) < 0) |
ae095f86 LP |
1741 | return -errno; |
1742 | ||
1743 | return 0; | |
1744 | } | |
ff975efb LP |
1745 | |
1746 | int bus_kernel_drop_one(int fd) { | |
1747 | struct kdbus_cmd_recv recv = { | |
94e15fdc DH |
1748 | .size = sizeof(recv), |
1749 | .flags = KDBUS_RECV_DROP, | |
ff975efb LP |
1750 | }; |
1751 | ||
1752 | assert(fd >= 0); | |
1753 | ||
94e15fdc | 1754 | if (ioctl(fd, KDBUS_CMD_RECV, &recv) < 0) |
ff975efb LP |
1755 | return -errno; |
1756 | ||
1757 | return 0; | |
1758 | } | |
b5dae4c7 LP |
1759 | |
1760 | int bus_kernel_realize_attach_flags(sd_bus *bus) { | |
b2086f60 | 1761 | struct kdbus_cmd *update; |
b5dae4c7 LP |
1762 | struct kdbus_item *n; |
1763 | ||
1764 | assert(bus); | |
1765 | assert(bus->is_kernel); | |
1766 | ||
b2086f60 | 1767 | update = alloca0_align(offsetof(struct kdbus_cmd, items) + |
fa7796e9 LP |
1768 | ALIGN8(offsetof(struct kdbus_item, data64) + sizeof(uint64_t)), |
1769 | 8); | |
b5dae4c7 LP |
1770 | |
1771 | n = update->items; | |
1772 | n->type = KDBUS_ITEM_ATTACH_FLAGS_RECV; | |
1773 | n->size = offsetof(struct kdbus_item, data64) + sizeof(uint64_t); | |
1774 | n->data64[0] = bus->attach_flags; | |
1775 | ||
fa7796e9 | 1776 | update->size = |
b2086f60 | 1777 | offsetof(struct kdbus_cmd, items) + |
fa7796e9 | 1778 | ALIGN8(n->size); |
b5dae4c7 | 1779 | |
b2086f60 | 1780 | if (ioctl(bus->input_fd, KDBUS_CMD_UPDATE, update) < 0) |
b5dae4c7 LP |
1781 | return -errno; |
1782 | ||
1783 | return 0; | |
1784 | } | |
1a299299 | 1785 | |
3acc1daf LP |
1786 | int bus_kernel_get_bus_name(sd_bus *bus, char **name) { |
1787 | struct kdbus_cmd_info cmd = { | |
1788 | .size = sizeof(struct kdbus_cmd_info), | |
1789 | }; | |
1790 | struct kdbus_info *info; | |
1791 | struct kdbus_item *item; | |
1792 | char *n = NULL; | |
1793 | int r; | |
1794 | ||
1795 | assert(bus); | |
1796 | assert(name); | |
1797 | assert(bus->is_kernel); | |
1798 | ||
1799 | r = ioctl(bus->input_fd, KDBUS_CMD_BUS_CREATOR_INFO, &cmd); | |
1800 | if (r < 0) | |
1801 | return -errno; | |
1802 | ||
1803 | info = (struct kdbus_info*) ((uint8_t*) bus->kdbus_buffer + cmd.offset); | |
1804 | ||
1805 | KDBUS_ITEM_FOREACH(item, info, items) | |
1806 | if (item->type == KDBUS_ITEM_MAKE_NAME) { | |
1807 | r = free_and_strdup(&n, item->str); | |
1808 | break; | |
1809 | } | |
1810 | ||
1811 | bus_kernel_cmd_free(bus, cmd.offset); | |
1812 | ||
1813 | if (r < 0) | |
1814 | return r; | |
1815 | if (!n) | |
1816 | return -EIO; | |
1817 | ||
1818 | *name = n; | |
1819 | return 0; | |
1820 | } |