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