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