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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 LP |
30 | |
31 | #include "util.h" | |
65dae17a | 32 | #include "strv.h" |
6629161f LP |
33 | |
34 | #include "bus-internal.h" | |
35 | #include "bus-message.h" | |
36 | #include "bus-kernel.h" | |
a56f19c4 | 37 | #include "bus-bloom.h" |
777d7a61 | 38 | #include "bus-util.h" |
a6278b88 | 39 | #include "bus-label.h" |
751bc6ac | 40 | #include "cgroup-util.h" |
777d7a61 LP |
41 | |
42 | #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t)) | |
6629161f | 43 | |
c7819669 | 44 | int bus_kernel_parse_unique_name(const char *s, uint64_t *id) { |
6629161f LP |
45 | int r; |
46 | ||
47 | assert(s); | |
48 | assert(id); | |
49 | ||
50 | if (!startswith(s, ":1.")) | |
51 | return 0; | |
52 | ||
53 | r = safe_atou64(s + 3, id); | |
54 | if (r < 0) | |
55 | return r; | |
56 | ||
57 | return 1; | |
58 | } | |
59 | ||
febfd508 | 60 | static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) { |
6629161f | 61 | assert(d); |
6629161f LP |
62 | assert(sz > 0); |
63 | ||
e86b80b8 LP |
64 | *d = ALIGN8_PTR(*d); |
65 | ||
66b26c5c LP |
66 | /* Note that p can be NULL, which encodes a region full of |
67 | * zeroes, which is useful to optimize certain padding | |
68 | * conditions */ | |
69 | ||
febfd508 | 70 | (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec); |
ea1edece | 71 | (*d)->type = KDBUS_ITEM_PAYLOAD_VEC; |
a392d361 | 72 | (*d)->vec.address = PTR_TO_UINT64(p); |
6629161f LP |
73 | (*d)->vec.size = sz; |
74 | ||
febfd508 | 75 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
76 | } |
77 | ||
a392d361 LP |
78 | static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t sz) { |
79 | assert(d); | |
80 | assert(memfd >= 0); | |
81 | assert(sz > 0); | |
82 | ||
83 | *d = ALIGN8_PTR(*d); | |
84 | (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd); | |
ea1edece | 85 | (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD; |
a392d361 LP |
86 | (*d)->memfd.fd = memfd; |
87 | (*d)->memfd.size = sz; | |
88 | ||
89 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); | |
90 | } | |
91 | ||
febfd508 | 92 | static void append_destination(struct kdbus_item **d, const char *s, size_t length) { |
6629161f | 93 | assert(d); |
b5baa8fe | 94 | assert(s); |
6629161f | 95 | |
e86b80b8 LP |
96 | *d = ALIGN8_PTR(*d); |
97 | ||
febfd508 | 98 | (*d)->size = offsetof(struct kdbus_item, str) + length + 1; |
ea1edece | 99 | (*d)->type = KDBUS_ITEM_DST_NAME; |
51038c03 | 100 | memcpy((*d)->str, s, length + 1); |
6629161f | 101 | |
febfd508 | 102 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
103 | } |
104 | ||
18a28147 KS |
105 | static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) { |
106 | struct kdbus_item *i; | |
a56f19c4 | 107 | |
b5baa8fe | 108 | assert(d); |
b5baa8fe | 109 | |
18a28147 | 110 | i = ALIGN8_PTR(*d); |
b5baa8fe | 111 | |
18a28147 KS |
112 | i->size = offsetof(struct kdbus_item, bloom_filter) + |
113 | offsetof(struct kdbus_bloom_filter, data) + | |
114 | length; | |
115 | i->type = KDBUS_ITEM_BLOOM_FILTER; | |
b5baa8fe | 116 | |
18a28147 | 117 | *d = (struct kdbus_item *) ((uint8_t*) i + i->size); |
a56f19c4 | 118 | |
18a28147 | 119 | return &i->bloom_filter; |
a56f19c4 LP |
120 | } |
121 | ||
febfd508 | 122 | static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) { |
9097fe29 LP |
123 | assert(d); |
124 | assert(fds); | |
125 | assert(n_fds > 0); | |
126 | ||
127 | *d = ALIGN8_PTR(*d); | |
febfd508 | 128 | (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds; |
ea1edece | 129 | (*d)->type = KDBUS_ITEM_FDS; |
9097fe29 LP |
130 | memcpy((*d)->fds, fds, sizeof(int) * n_fds); |
131 | ||
febfd508 | 132 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
9097fe29 LP |
133 | } |
134 | ||
18a28147 KS |
135 | static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) { |
136 | void *data; | |
a56f19c4 LP |
137 | unsigned i; |
138 | int r; | |
139 | ||
140 | assert(m); | |
141 | assert(bloom); | |
142 | ||
18a28147 | 143 | data = bloom->data; |
29804cc1 | 144 | memzero(data, m->bus->bloom_size); |
18a28147 | 145 | bloom->generation = 0; |
a56f19c4 | 146 | |
b28ff39f | 147 | 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 |
148 | |
149 | if (m->interface) | |
b28ff39f | 150 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface); |
a56f19c4 | 151 | if (m->member) |
b28ff39f | 152 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member); |
a56f19c4 | 153 | if (m->path) { |
b28ff39f LP |
154 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path); |
155 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path); | |
156 | bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/'); | |
a56f19c4 LP |
157 | } |
158 | ||
159 | r = sd_bus_message_rewind(m, true); | |
160 | if (r < 0) | |
161 | return r; | |
162 | ||
163 | for (i = 0; i < 64; i++) { | |
164 | char type; | |
165 | const char *t; | |
166 | char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")]; | |
167 | char *e; | |
168 | ||
169 | r = sd_bus_message_peek_type(m, &type, NULL); | |
170 | if (r < 0) | |
171 | return r; | |
172 | ||
173 | if (type != SD_BUS_TYPE_STRING && | |
174 | type != SD_BUS_TYPE_OBJECT_PATH && | |
175 | type != SD_BUS_TYPE_SIGNATURE) | |
176 | break; | |
177 | ||
178 | r = sd_bus_message_read_basic(m, type, &t); | |
179 | if (r < 0) | |
180 | return r; | |
181 | ||
182 | e = stpcpy(buf, "arg"); | |
183 | if (i < 10) | |
693eb9a2 | 184 | *(e++) = '0' + (char) i; |
a56f19c4 | 185 | else { |
693eb9a2 LP |
186 | *(e++) = '0' + (char) (i / 10); |
187 | *(e++) = '0' + (char) (i % 10); | |
a56f19c4 LP |
188 | } |
189 | ||
190 | *e = 0; | |
b28ff39f | 191 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t); |
a56f19c4 LP |
192 | |
193 | strcpy(e, "-dot-prefix"); | |
b28ff39f | 194 | bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t, '.'); |
a56f19c4 | 195 | strcpy(e, "-slash-prefix"); |
b28ff39f | 196 | bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t, '/'); |
a56f19c4 LP |
197 | } |
198 | ||
199 | return 0; | |
b5baa8fe LP |
200 | } |
201 | ||
5b7d4c1c | 202 | static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { |
9b29bb68 | 203 | struct bus_body_part *part; |
febfd508 | 204 | struct kdbus_item *d; |
6629161f LP |
205 | bool well_known; |
206 | uint64_t unique; | |
207 | size_t sz, dl; | |
9b29bb68 | 208 | unsigned i; |
6629161f LP |
209 | int r; |
210 | ||
5b7d4c1c | 211 | assert(b); |
6629161f LP |
212 | assert(m); |
213 | assert(m->sealed); | |
e9a967f9 | 214 | |
069f5e61 LP |
215 | /* We put this together only once, if this message is reused |
216 | * we reuse the earlier-built version */ | |
e9a967f9 LP |
217 | if (m->kdbus) |
218 | return 0; | |
6629161f LP |
219 | |
220 | if (m->destination) { | |
c7819669 | 221 | r = bus_kernel_parse_unique_name(m->destination, &unique); |
6629161f LP |
222 | if (r < 0) |
223 | return r; | |
224 | ||
225 | well_known = r == 0; | |
226 | } else | |
227 | well_known = false; | |
228 | ||
b1454bf0 | 229 | sz = offsetof(struct kdbus_msg, items); |
6629161f | 230 | |
a392d361 LP |
231 | assert_cc(ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)) == |
232 | ALIGN8(offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd))); | |
233 | ||
69aec65c | 234 | /* Add in fixed header, fields header and payload */ |
c91cb83c | 235 | sz += (1 + m->n_body_parts) * |
bc7fd8cd | 236 | ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)); |
6629161f | 237 | |
69aec65c | 238 | /* Add space for bloom filter */ |
18a28147 KS |
239 | sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) + |
240 | offsetof(struct kdbus_bloom_filter, data) + | |
b28ff39f | 241 | m->bus->bloom_size); |
b5baa8fe | 242 | |
6629161f LP |
243 | /* Add in well-known destination header */ |
244 | if (well_known) { | |
245 | dl = strlen(m->destination); | |
febfd508 | 246 | sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1); |
6629161f LP |
247 | } |
248 | ||
9097fe29 LP |
249 | /* Add space for unix fds */ |
250 | if (m->n_fds > 0) | |
febfd508 | 251 | sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds); |
9097fe29 | 252 | |
c556fe79 | 253 | m->kdbus = memalign(8, sz); |
66b26c5c LP |
254 | if (!m->kdbus) { |
255 | r = -ENOMEM; | |
256 | goto fail; | |
257 | } | |
6629161f | 258 | |
66b26c5c | 259 | m->free_kdbus = true; |
29804cc1 | 260 | memzero(m->kdbus, sz); |
d9115e18 | 261 | |
6629161f | 262 | m->kdbus->flags = |
0461f8cd | 263 | ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) | |
97f82db3 | 264 | ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0); |
6629161f LP |
265 | m->kdbus->dst_id = |
266 | well_known ? 0 : | |
b5baa8fe | 267 | m->destination ? unique : KDBUS_DST_ID_BROADCAST; |
6647dc66 | 268 | m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; |
42c4ebcb | 269 | m->kdbus->cookie = (uint64_t) m->header->serial; |
ca7b42c8 | 270 | m->kdbus->priority = m->priority; |
80a33f11 KS |
271 | |
272 | if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) | |
693eb9a2 | 273 | m->kdbus->cookie_reply = m->reply_cookie; |
80a33f11 KS |
274 | else |
275 | m->kdbus->timeout_ns = m->timeout * NSEC_PER_USEC; | |
6629161f | 276 | |
b1454bf0 | 277 | d = m->kdbus->items; |
6629161f LP |
278 | |
279 | if (well_known) | |
280 | append_destination(&d, m->destination, dl); | |
281 | ||
c91cb83c | 282 | append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
a392d361 LP |
283 | |
284 | MESSAGE_FOREACH_PART(part, i, m) { | |
285 | if (part->is_zero) { | |
66b26c5c LP |
286 | /* If this is padding then simply send a |
287 | * vector with a NULL data pointer which the | |
288 | * kernel will just pass through. This is the | |
289 | * most efficient way to encode zeroes */ | |
290 | ||
a392d361 LP |
291 | append_payload_vec(&d, NULL, part->size); |
292 | continue; | |
293 | } | |
294 | ||
66b26c5c LP |
295 | if (part->memfd >= 0 && part->sealed && m->destination) { |
296 | /* Try to send a memfd, if the part is | |
297 | * sealed and this is not a broadcast. Since we can only */ | |
a392d361 | 298 | |
66b26c5c LP |
299 | append_payload_memfd(&d, part->memfd, part->size); |
300 | continue; | |
a392d361 LP |
301 | } |
302 | ||
73e231ab JE |
303 | /* Otherwise, let's send a vector to the actual data. |
304 | * For that, we need to map it first. */ | |
66b26c5c LP |
305 | r = bus_body_part_map(part); |
306 | if (r < 0) | |
307 | goto fail; | |
a392d361 | 308 | |
bc7fd8cd | 309 | append_payload_vec(&d, part->data, part->size); |
a392d361 | 310 | } |
6629161f | 311 | |
5b7d4c1c | 312 | if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) { |
18a28147 | 313 | struct kdbus_bloom_filter *bloom; |
5b7d4c1c | 314 | |
b28ff39f | 315 | bloom = append_bloom(&d, m->bus->bloom_size); |
18a28147 | 316 | r = bus_message_setup_bloom(m, bloom); |
a392d361 LP |
317 | if (r < 0) |
318 | goto fail; | |
5b7d4c1c | 319 | } |
b5baa8fe | 320 | |
9097fe29 LP |
321 | if (m->n_fds > 0) |
322 | append_fds(&d, m->fds, m->n_fds); | |
323 | ||
e9a967f9 | 324 | m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus; |
6629161f LP |
325 | assert(m->kdbus->size <= sz); |
326 | ||
327 | return 0; | |
a392d361 LP |
328 | |
329 | fail: | |
66b26c5c | 330 | m->poisoned = true; |
a392d361 | 331 | return r; |
6629161f LP |
332 | } |
333 | ||
cb67f718 DM |
334 | static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { |
335 | sd_bus_message *m = NULL; | |
336 | struct kdbus_item *d; | |
337 | unsigned n_fds = 0; | |
338 | _cleanup_free_ int *fds = NULL; | |
339 | struct bus_header *h = NULL; | |
340 | size_t total, n_bytes = 0, idx = 0; | |
341 | const char *destination = NULL, *seclabel = NULL; | |
6629161f LP |
342 | int r; |
343 | ||
cb67f718 DM |
344 | assert(bus); |
345 | assert(k); | |
346 | assert(k->payload_type == KDBUS_PAYLOAD_DBUS); | |
35460afc | 347 | |
cb67f718 DM |
348 | KDBUS_ITEM_FOREACH(d, k, items) { |
349 | size_t l; | |
f08838da | 350 | |
cb67f718 | 351 | l = d->size - offsetof(struct kdbus_item, data); |
8f155917 | 352 | |
cb67f718 | 353 | switch (d->type) { |
62b3e928 | 354 | |
cb67f718 DM |
355 | case KDBUS_ITEM_PAYLOAD_OFF: |
356 | if (!h) { | |
357 | h = (struct bus_header *)((uint8_t *)k + d->vec.offset); | |
8a0e0ed9 | 358 | |
cb67f718 DM |
359 | if (!bus_header_is_complete(h, d->vec.size)) |
360 | return -EBADMSG; | |
361 | } | |
8a0e0ed9 | 362 | |
cb67f718 DM |
363 | n_bytes += d->vec.size; |
364 | break; | |
8a0e0ed9 | 365 | |
cb67f718 DM |
366 | case KDBUS_ITEM_PAYLOAD_MEMFD: |
367 | if (!h) | |
368 | return -EBADMSG; | |
8a0e0ed9 | 369 | |
cb67f718 DM |
370 | n_bytes += d->memfd.size; |
371 | break; | |
8a0e0ed9 | 372 | |
cb67f718 DM |
373 | case KDBUS_ITEM_FDS: { |
374 | int *f; | |
375 | unsigned j; | |
8a0e0ed9 | 376 | |
cb67f718 DM |
377 | j = l / sizeof(int); |
378 | f = realloc(fds, sizeof(int) * (n_fds + j)); | |
379 | if (!f) | |
380 | return -ENOMEM; | |
8a0e0ed9 | 381 | |
cb67f718 DM |
382 | fds = f; |
383 | memcpy(fds + n_fds, d->fds, sizeof(int) * j); | |
384 | n_fds += j; | |
385 | break; | |
386 | } | |
62b3e928 | 387 | |
cb67f718 DM |
388 | case KDBUS_ITEM_SECLABEL: |
389 | seclabel = d->str; | |
390 | break; | |
fd8d62d9 LP |
391 | } |
392 | } | |
393 | ||
cb67f718 DM |
394 | if (!h) |
395 | return -EBADMSG; | |
de297575 | 396 | |
cb67f718 DM |
397 | r = bus_header_message_size(h, &total); |
398 | if (r < 0) | |
399 | return r; | |
219728b3 | 400 | |
cb67f718 DM |
401 | if (n_bytes != total) |
402 | return -EBADMSG; | |
6629161f | 403 | |
cb67f718 DM |
404 | /* on kdbus we only speak native endian gvariant, never dbus1 |
405 | * marshalling or reverse endian */ | |
406 | if (h->version != 2 || | |
407 | h->endian != BUS_NATIVE_ENDIAN) | |
408 | return -EPROTOTYPE; | |
c58dea19 | 409 | |
cb67f718 DM |
410 | r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m); |
411 | if (r < 0) | |
412 | return r; | |
6629161f | 413 | |
cb67f718 DM |
414 | /* The well-known names list is different from the other |
415 | credentials. If we asked for it, but nothing is there, this | |
416 | means that the list of well-known names is simply empty, not | |
417 | that we lack any data */ | |
35460afc | 418 | |
cb67f718 | 419 | m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask; |
f08838da | 420 | |
cb67f718 DM |
421 | KDBUS_ITEM_FOREACH(d, k, items) { |
422 | size_t l; | |
6629161f | 423 | |
cb67f718 | 424 | l = d->size - offsetof(struct kdbus_item, data); |
6629161f | 425 | |
cb67f718 | 426 | switch (d->type) { |
6629161f | 427 | |
cb67f718 DM |
428 | case KDBUS_ITEM_PAYLOAD_OFF: { |
429 | size_t begin_body; | |
6629161f | 430 | |
cb67f718 | 431 | begin_body = BUS_MESSAGE_BODY_BEGIN(m); |
6629161f | 432 | |
cb67f718 DM |
433 | if (idx + d->vec.size > begin_body) { |
434 | struct bus_body_part *part; | |
a43b9ca3 | 435 | |
cb67f718 | 436 | /* Contains body material */ |
6629161f | 437 | |
cb67f718 DM |
438 | part = message_append_part(m); |
439 | if (!part) { | |
440 | r = -ENOMEM; | |
441 | goto fail; | |
442 | } | |
a43b9ca3 | 443 | |
cb67f718 DM |
444 | /* A -1 offset is NUL padding. */ |
445 | part->is_zero = d->vec.offset == ~0ULL; | |
a43b9ca3 | 446 | |
cb67f718 DM |
447 | if (idx >= begin_body) { |
448 | if (!part->is_zero) | |
449 | part->data = (uint8_t *)k + d->vec.offset; | |
450 | part->size = d->vec.size; | |
451 | } else { | |
452 | if (!part->is_zero) | |
453 | part->data = (uint8_t *)k + d->vec.offset + (begin_body - idx); | |
454 | part->size = d->vec.size - (begin_body - idx); | |
455 | } | |
a43b9ca3 | 456 | |
cb67f718 | 457 | part->sealed = true; |
ff4994c5 | 458 | } |
a43b9ca3 | 459 | |
cb67f718 DM |
460 | idx += d->vec.size; |
461 | break; | |
462 | } | |
a43b9ca3 | 463 | |
cb67f718 DM |
464 | case KDBUS_ITEM_PAYLOAD_MEMFD: { |
465 | struct bus_body_part *part; | |
a43b9ca3 | 466 | |
cb67f718 DM |
467 | if (idx < BUS_MESSAGE_BODY_BEGIN(m)) { |
468 | r = -EBADMSG; | |
469 | goto fail; | |
ff4994c5 | 470 | } |
a43b9ca3 | 471 | |
cb67f718 DM |
472 | part = message_append_part(m); |
473 | if (!part) { | |
474 | r = -ENOMEM; | |
475 | goto fail; | |
476 | } | |
a43b9ca3 | 477 | |
cb67f718 DM |
478 | part->memfd = d->memfd.fd; |
479 | part->size = d->memfd.size; | |
480 | part->sealed = true; | |
a43b9ca3 | 481 | |
cb67f718 DM |
482 | idx += d->memfd.size; |
483 | break; | |
484 | } | |
a43b9ca3 | 485 | |
cb67f718 DM |
486 | case KDBUS_ITEM_CREDS: |
487 | /* UID/GID/PID are always valid */ | |
488 | m->creds.uid = (uid_t) d->creds.uid; | |
489 | m->creds.gid = (gid_t) d->creds.gid; | |
490 | m->creds.pid = (pid_t) d->creds.pid; | |
491 | m->creds.mask |= (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID) & bus->creds_mask; | |
a43b9ca3 | 492 | |
cb67f718 DM |
493 | /* The PID starttime/TID might be missing |
494 | * however, when the data is faked by some | |
495 | * data bus proxy and it lacks that | |
496 | * information about the real client since | |
497 | * SO_PEERCRED is used for that */ | |
6629161f | 498 | |
cb67f718 DM |
499 | if (d->creds.starttime > 0) { |
500 | m->creds.pid_starttime = d->creds.starttime / NSEC_PER_USEC; | |
501 | m->creds.mask |= SD_BUS_CREDS_PID_STARTTIME & bus->creds_mask; | |
502 | } | |
6629161f | 503 | |
cb67f718 DM |
504 | if (d->creds.tid > 0) { |
505 | m->creds.tid = (pid_t) d->creds.tid; | |
506 | m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask; | |
507 | } | |
508 | break; | |
6629161f | 509 | |
cb67f718 | 510 | case KDBUS_ITEM_TIMESTAMP: |
41add995 LP |
511 | |
512 | if (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) { | |
513 | m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC; | |
514 | m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC; | |
515 | m->seqnum = d->timestamp.seqnum; | |
516 | } | |
517 | ||
cb67f718 | 518 | break; |
fd8d62d9 | 519 | |
cb67f718 DM |
520 | case KDBUS_ITEM_PID_COMM: |
521 | m->creds.comm = d->str; | |
522 | m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask; | |
523 | break; | |
fd8d62d9 | 524 | |
cb67f718 DM |
525 | case KDBUS_ITEM_TID_COMM: |
526 | m->creds.tid_comm = d->str; | |
527 | m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask; | |
528 | break; | |
6629161f | 529 | |
cb67f718 DM |
530 | case KDBUS_ITEM_EXE: |
531 | m->creds.exe = d->str; | |
532 | m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask; | |
533 | break; | |
6629161f | 534 | |
cb67f718 DM |
535 | case KDBUS_ITEM_CMDLINE: |
536 | m->creds.cmdline = d->str; | |
537 | m->creds.cmdline_size = l; | |
538 | m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask; | |
539 | break; | |
777d7a61 | 540 | |
cb67f718 DM |
541 | case KDBUS_ITEM_CGROUP: |
542 | m->creds.cgroup = d->str; | |
543 | 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 | 544 | |
cb67f718 DM |
545 | if (!bus->cgroup_root) { |
546 | r = cg_get_root_path(&bus->cgroup_root); | |
547 | if (r < 0) | |
548 | goto fail; | |
549 | } | |
777d7a61 | 550 | |
cb67f718 | 551 | m->creds.cgroup_root = bus->cgroup_root; |
777d7a61 | 552 | |
cb67f718 | 553 | break; |
777d7a61 | 554 | |
cb67f718 DM |
555 | case KDBUS_ITEM_AUDIT: |
556 | m->creds.audit_session_id = (uint32_t) d->audit.sessionid; | |
557 | m->creds.audit_login_uid = (uid_t) d->audit.loginuid; | |
558 | m->creds.mask |= (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID) & bus->creds_mask; | |
559 | break; | |
777d7a61 | 560 | |
cb67f718 DM |
561 | case KDBUS_ITEM_CAPS: |
562 | m->creds.capability = d->data; | |
563 | m->creds.capability_size = l; | |
564 | 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; | |
565 | break; | |
219728b3 | 566 | |
cb67f718 DM |
567 | case KDBUS_ITEM_DST_NAME: |
568 | if (!service_name_is_valid(d->str)) | |
569 | return -EBADMSG; | |
219728b3 | 570 | |
cb67f718 DM |
571 | destination = d->str; |
572 | break; | |
777d7a61 | 573 | |
cb67f718 DM |
574 | case KDBUS_ITEM_NAME: |
575 | if (!service_name_is_valid(d->name.name)) | |
576 | return -EBADMSG; | |
777d7a61 | 577 | |
cb67f718 DM |
578 | r = strv_extend(&m->creds.well_known_names, d->name.name); |
579 | if (r < 0) | |
580 | goto fail; | |
581 | break; | |
777d7a61 | 582 | |
cccb0b2c LP |
583 | case KDBUS_ITEM_CONN_NAME: |
584 | m->creds.conn_name = d->str; | |
585 | m->creds.mask |= SD_BUS_CREDS_CONNECTION_NAME & bus->creds_mask; | |
586 | break; | |
587 | ||
cb67f718 DM |
588 | case KDBUS_ITEM_FDS: |
589 | case KDBUS_ITEM_SECLABEL: | |
590 | break; | |
d78bf250 | 591 | |
cb67f718 DM |
592 | default: |
593 | log_debug("Got unknown field from kernel %llu", d->type); | |
594 | } | |
595 | } | |
d78bf250 | 596 | |
cb67f718 DM |
597 | r = bus_message_parse_fields(m); |
598 | if (r < 0) | |
599 | goto fail; | |
777d7a61 | 600 | |
cb67f718 DM |
601 | /* Override information from the user header with data from the kernel */ |
602 | if (k->src_id == KDBUS_SRC_ID_KERNEL) | |
603 | m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus"; | |
604 | else { | |
605 | snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id); | |
606 | m->sender = m->creds.unique_name = m->sender_buffer; | |
607 | } | |
777d7a61 | 608 | |
cb67f718 DM |
609 | if (destination) |
610 | m->destination = destination; | |
611 | else if (k->dst_id == KDBUS_DST_ID_BROADCAST) | |
612 | m->destination = NULL; | |
613 | else if (k->dst_id == KDBUS_DST_ID_NAME) | |
614 | m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */ | |
615 | else { | |
616 | snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id); | |
617 | m->destination = m->destination_buffer; | |
618 | } | |
777d7a61 | 619 | |
cb67f718 DM |
620 | /* We take possession of the kmsg struct now */ |
621 | m->kdbus = k; | |
622 | m->release_kdbus = true; | |
623 | m->free_fds = true; | |
624 | fds = NULL; | |
777d7a61 | 625 | |
cb67f718 | 626 | bus->rqueue[bus->rqueue_size++] = m; |
777d7a61 | 627 | |
cb67f718 | 628 | return 1; |
777d7a61 | 629 | |
cb67f718 DM |
630 | fail: |
631 | if (m) { | |
632 | struct bus_body_part *part; | |
633 | unsigned i; | |
777d7a61 | 634 | |
cb67f718 DM |
635 | /* Make sure the memfds are not freed twice */ |
636 | MESSAGE_FOREACH_PART(part, i, m) | |
637 | if (part->memfd >= 0) | |
638 | part->memfd = -1; | |
777d7a61 | 639 | |
cb67f718 DM |
640 | sd_bus_message_unref(m); |
641 | } | |
777d7a61 | 642 | |
cb67f718 DM |
643 | return r; |
644 | } | |
777d7a61 | 645 | |
cb67f718 DM |
646 | int bus_kernel_take_fd(sd_bus *b) { |
647 | struct kdbus_cmd_hello *hello; | |
648 | struct kdbus_item *item; | |
5972fe95 LP |
649 | _cleanup_free_ char *g = NULL; |
650 | const char *name; | |
651 | size_t l = 0, m = 0, sz; | |
cb67f718 | 652 | int r; |
777d7a61 | 653 | |
cb67f718 | 654 | assert(b); |
7adc46fc | 655 | |
cb67f718 DM |
656 | if (b->is_server) |
657 | return -EINVAL; | |
777d7a61 | 658 | |
cb67f718 | 659 | b->use_memfd = 1; |
777d7a61 | 660 | |
5972fe95 | 661 | if (b->connection_name) { |
a6278b88 | 662 | g = bus_label_escape(b->connection_name); |
5972fe95 LP |
663 | if (!g) |
664 | return -ENOMEM; | |
665 | ||
666 | name = g; | |
667 | } else { | |
668 | char pr[17] = {}; | |
669 | ||
670 | /* If no name is explicitly set, we'll include a hint | |
671 | * indicating the library implementation, a hint which | |
672 | * kind of bus this is and the thread name */ | |
673 | ||
674 | assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0); | |
675 | ||
676 | if (isempty(pr)) { | |
677 | name = b->is_system ? "sd-system" : | |
678 | b->is_user ? "sd-user" : "sd"; | |
679 | } else { | |
680 | _cleanup_free_ char *e = NULL; | |
681 | ||
a6278b88 | 682 | e = bus_label_escape(pr); |
5972fe95 LP |
683 | if (!e) |
684 | return -ENOMEM; | |
685 | ||
686 | g = strappend(b->is_system ? "sd-system-" : | |
687 | b->is_user ? "sd-user-" : "sd-", | |
688 | e); | |
689 | if (!g) | |
690 | return -ENOMEM; | |
691 | ||
692 | name = g; | |
693 | } | |
694 | ||
a6278b88 | 695 | b->connection_name = bus_label_unescape(name); |
5972fe95 LP |
696 | if (!b->connection_name) |
697 | return -ENOMEM; | |
698 | } | |
699 | ||
700 | m = strlen(name); | |
701 | ||
702 | sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) + | |
703 | ALIGN8(offsetof(struct kdbus_item, str) + m + 1); | |
777d7a61 | 704 | |
cb67f718 | 705 | if (b->fake_creds_valid) |
5972fe95 | 706 | sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds)); |
777d7a61 | 707 | |
cb67f718 DM |
708 | if (b->fake_label) { |
709 | l = strlen(b->fake_label); | |
710 | sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1); | |
711 | } | |
777d7a61 | 712 | |
cb67f718 DM |
713 | hello = alloca0(sz); |
714 | hello->size = sz; | |
715 | hello->conn_flags = b->hello_flags; | |
716 | hello->attach_flags = b->attach_flags; | |
717 | hello->pool_size = KDBUS_POOL_SIZE; | |
777d7a61 | 718 | |
cb67f718 DM |
719 | item = hello->items; |
720 | ||
5972fe95 LP |
721 | item->size = offsetof(struct kdbus_item, str) + m + 1; |
722 | item->type = KDBUS_ITEM_CONN_NAME; | |
723 | memcpy(item->str, name, m + 1); | |
724 | item = KDBUS_ITEM_NEXT(item); | |
725 | ||
cb67f718 DM |
726 | if (b->fake_creds_valid) { |
727 | item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds); | |
728 | item->type = KDBUS_ITEM_CREDS; | |
729 | item->creds = b->fake_creds; | |
730 | ||
731 | item = KDBUS_ITEM_NEXT(item); | |
777d7a61 LP |
732 | } |
733 | ||
cb67f718 DM |
734 | if (b->fake_label) { |
735 | item->size = offsetof(struct kdbus_item, str) + l + 1; | |
5972fe95 | 736 | item->type = KDBUS_ITEM_SECLABEL; |
cb67f718 | 737 | memcpy(item->str, b->fake_label, l+1); |
777d7a61 LP |
738 | } |
739 | ||
cb67f718 DM |
740 | r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello); |
741 | if (r < 0) | |
742 | return -errno; | |
777d7a61 | 743 | |
cb67f718 DM |
744 | if (!b->kdbus_buffer) { |
745 | b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0); | |
746 | if (b->kdbus_buffer == MAP_FAILED) { | |
747 | b->kdbus_buffer = NULL; | |
748 | return -errno; | |
749 | } | |
750 | } | |
6629161f | 751 | |
cb67f718 DM |
752 | /* The higher 32bit of both flags fields are considered |
753 | * 'incompatible flags'. Refuse them all for now. */ | |
754 | if (hello->bus_flags > 0xFFFFFFFFULL || | |
755 | hello->conn_flags > 0xFFFFFFFFULL) | |
756 | return -ENOTSUP; | |
6629161f | 757 | |
b28ff39f | 758 | if (!bloom_validate_parameters((size_t) hello->bloom.size, (unsigned) hello->bloom.n_hash)) |
cb67f718 | 759 | return -ENOTSUP; |
6629161f | 760 | |
b28ff39f LP |
761 | b->bloom_size = (size_t) hello->bloom.size; |
762 | b->bloom_n_hash = (unsigned) hello->bloom.n_hash; | |
763 | ||
cb67f718 DM |
764 | if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) |
765 | return -ENOMEM; | |
6629161f | 766 | |
cb67f718 | 767 | b->unique_id = hello->id; |
6629161f | 768 | |
cb67f718 DM |
769 | b->is_kernel = true; |
770 | b->bus_client = true; | |
771 | b->can_fds = !!(hello->conn_flags & KDBUS_HELLO_ACCEPT_FD); | |
772 | b->message_version = 2; | |
773 | b->message_endian = BUS_NATIVE_ENDIAN; | |
c91cb83c | 774 | |
cb67f718 DM |
775 | /* the kernel told us the UUID of the underlying bus */ |
776 | memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes)); | |
6629161f | 777 | |
cb67f718 DM |
778 | return bus_start_running(b); |
779 | } | |
6629161f | 780 | |
cb67f718 DM |
781 | int bus_kernel_connect(sd_bus *b) { |
782 | assert(b); | |
783 | assert(b->input_fd < 0); | |
784 | assert(b->output_fd < 0); | |
785 | assert(b->kernel); | |
1307c3ff | 786 | |
cb67f718 DM |
787 | if (b->is_server) |
788 | return -EINVAL; | |
1307c3ff | 789 | |
cb67f718 DM |
790 | b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC); |
791 | if (b->input_fd < 0) | |
792 | return -errno; | |
6629161f | 793 | |
cb67f718 | 794 | b->output_fd = b->input_fd; |
6629161f | 795 | |
cb67f718 DM |
796 | return bus_kernel_take_fd(b); |
797 | } | |
f9be01f3 | 798 | |
069f5e61 LP |
799 | static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { |
800 | uint64_t off; | |
801 | struct kdbus_item *d; | |
802 | ||
803 | assert(bus); | |
804 | assert(k); | |
805 | ||
806 | off = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer; | |
807 | ioctl(bus->input_fd, KDBUS_CMD_FREE, &off); | |
808 | ||
809 | KDBUS_ITEM_FOREACH(d, k, items) { | |
810 | ||
811 | if (d->type == KDBUS_ITEM_FDS) | |
812 | close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int)); | |
813 | else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD) | |
03e334a1 | 814 | safe_close(d->memfd.fd); |
069f5e61 LP |
815 | } |
816 | } | |
817 | ||
818 | int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) { | |
cb67f718 | 819 | int r; |
6629161f | 820 | |
cb67f718 DM |
821 | assert(bus); |
822 | assert(m); | |
823 | assert(bus->state == BUS_RUNNING); | |
6629161f | 824 | |
cb67f718 DM |
825 | /* If we can't deliver, we want room for the error message */ |
826 | r = bus_rqueue_make_room(bus); | |
6629161f LP |
827 | if (r < 0) |
828 | return r; | |
829 | ||
cb67f718 | 830 | r = bus_message_setup_kmsg(bus, m); |
6629161f LP |
831 | if (r < 0) |
832 | return r; | |
833 | ||
069f5e61 LP |
834 | /* If this is a synchronous method call, then let's tell the |
835 | * kernel, so that it can pass CPU time/scheduling to the | |
836 | * destination for the time, if it wants to. If we | |
837 | * synchronously wait for the result anyway, we won't need CPU | |
838 | * anyway. */ | |
839 | if (hint_sync_call) | |
840 | m->kdbus->flags |= KDBUS_MSG_FLAGS_EXPECT_REPLY|KDBUS_MSG_FLAGS_SYNC_REPLY; | |
841 | ||
cb67f718 DM |
842 | r = ioctl(bus->output_fd, KDBUS_CMD_MSG_SEND, m->kdbus); |
843 | if (r < 0) { | |
844 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
845 | sd_bus_message *reply; | |
253ce82b | 846 | |
cb67f718 DM |
847 | if (errno == EAGAIN || errno == EINTR) |
848 | return 0; | |
849 | else if (errno == ENXIO || errno == ESRCH) { | |
6629161f | 850 | |
cb67f718 DM |
851 | /* ENXIO: unique name not known |
852 | * ESRCH: well-known name not known */ | |
6629161f | 853 | |
cb67f718 DM |
854 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
855 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination); | |
856 | else { | |
857 | log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination); | |
858 | return 0; | |
859 | } | |
777d7a61 | 860 | |
cb67f718 | 861 | } else if (errno == EADDRNOTAVAIL) { |
fd8d62d9 | 862 | |
cb67f718 | 863 | /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */ |
bc7fd8cd | 864 | |
cb67f718 DM |
865 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
866 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination); | |
867 | else { | |
868 | log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination); | |
869 | return 0; | |
870 | } | |
871 | } else | |
872 | return -errno; | |
bc7fd8cd | 873 | |
cb67f718 DM |
874 | r = bus_message_new_synthetic_error( |
875 | bus, | |
876 | BUS_MESSAGE_COOKIE(m), | |
877 | &error, | |
878 | &reply); | |
bc7fd8cd | 879 | |
cb67f718 DM |
880 | if (r < 0) |
881 | return r; | |
bc7fd8cd | 882 | |
cb67f718 DM |
883 | r = bus_seal_synthetic_message(bus, reply); |
884 | if (r < 0) | |
885 | return r; | |
62b3e928 | 886 | |
cb67f718 | 887 | bus->rqueue[bus->rqueue_size++] = reply; |
bc7fd8cd | 888 | |
069f5e61 LP |
889 | } else if (hint_sync_call) { |
890 | struct kdbus_msg *k; | |
fd8d62d9 | 891 | |
069f5e61 LP |
892 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + m->kdbus->offset_reply); |
893 | assert(k); | |
777d7a61 | 894 | |
069f5e61 | 895 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
1307c3ff | 896 | |
069f5e61 LP |
897 | r = bus_kernel_make_message(bus, k); |
898 | if (r < 0) { | |
899 | close_kdbus_msg(bus, k); | |
1307c3ff | 900 | |
069f5e61 LP |
901 | /* Anybody can send us invalid messages, let's just drop them. */ |
902 | if (r == -EBADMSG || r == -EPROTOTYPE) | |
903 | log_debug("Ignoring invalid message: %s", strerror(-r)); | |
904 | else | |
905 | return r; | |
906 | } | |
907 | } else { | |
908 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
909 | close_kdbus_msg(bus, k); | |
910 | } | |
cb67f718 | 911 | } |
069f5e61 LP |
912 | |
913 | return 1; | |
cb67f718 | 914 | } |
69aec65c | 915 | |
cb67f718 DM |
916 | static int push_name_owner_changed(sd_bus *bus, const char *name, const char *old_owner, const char *new_owner) { |
917 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; | |
918 | int r; | |
2dc9970b | 919 | |
cb67f718 | 920 | assert(bus); |
2dc9970b | 921 | |
cb67f718 DM |
922 | r = sd_bus_message_new_signal( |
923 | bus, | |
151b9b96 | 924 | &m, |
cb67f718 DM |
925 | "/org/freedesktop/DBus", |
926 | "org.freedesktop.DBus", | |
151b9b96 | 927 | "NameOwnerChanged"); |
cb67f718 DM |
928 | if (r < 0) |
929 | return r; | |
2dc9970b | 930 | |
cb67f718 DM |
931 | r = sd_bus_message_append(m, "sss", name, old_owner, new_owner); |
932 | if (r < 0) | |
933 | return r; | |
5b12334d | 934 | |
cb67f718 | 935 | m->sender = "org.freedesktop.DBus"; |
5b12334d | 936 | |
cb67f718 DM |
937 | r = bus_seal_synthetic_message(bus, m); |
938 | if (r < 0) | |
939 | return r; | |
5b12334d | 940 | |
cb67f718 DM |
941 | bus->rqueue[bus->rqueue_size++] = m; |
942 | m = NULL; | |
5b12334d | 943 | |
cb67f718 DM |
944 | return 1; |
945 | } | |
5b12334d | 946 | |
cb67f718 DM |
947 | static int translate_name_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { |
948 | char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX]; | |
5b12334d | 949 | |
cb67f718 DM |
950 | assert(bus); |
951 | assert(k); | |
952 | assert(d); | |
751bc6ac | 953 | |
cb67f718 DM |
954 | if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) |
955 | old_owner[0] = 0; | |
956 | else | |
957 | sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old.id); | |
751bc6ac | 958 | |
cb67f718 | 959 | if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) { |
751bc6ac | 960 | |
cb67f718 DM |
961 | if (isempty(old_owner)) |
962 | return 0; | |
5b12334d | 963 | |
cb67f718 DM |
964 | new_owner[0] = 0; |
965 | } else | |
966 | sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new.id); | |
5b12334d | 967 | |
cb67f718 DM |
968 | return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner); |
969 | } | |
5b12334d | 970 | |
cb67f718 DM |
971 | static int translate_id_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { |
972 | char owner[UNIQUE_NAME_MAX]; | |
2e2ec0ea | 973 | |
cb67f718 DM |
974 | assert(bus); |
975 | assert(k); | |
976 | assert(d); | |
777d7a61 | 977 | |
cb67f718 | 978 | sprintf(owner, ":1.%llu", d->id_change.id); |
2e2ec0ea | 979 | |
cb67f718 DM |
980 | return push_name_owner_changed( |
981 | bus, owner, | |
982 | d->type == KDBUS_ITEM_ID_ADD ? NULL : owner, | |
983 | d->type == KDBUS_ITEM_ID_ADD ? owner : NULL); | |
984 | } | |
49b832c5 | 985 | |
cb67f718 DM |
986 | static int translate_reply(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { |
987 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; | |
988 | int r; | |
777d7a61 | 989 | |
cb67f718 DM |
990 | assert(bus); |
991 | assert(k); | |
992 | assert(d); | |
acb5a3cb | 993 | |
cb67f718 DM |
994 | r = bus_message_new_synthetic_error( |
995 | bus, | |
996 | k->cookie_reply, | |
997 | d->type == KDBUS_ITEM_REPLY_TIMEOUT ? | |
998 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") : | |
999 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"), | |
1000 | &m); | |
1307c3ff | 1001 | if (r < 0) |
cb67f718 | 1002 | return r; |
51038c03 | 1003 | |
cb67f718 | 1004 | m->sender = "org.freedesktop.DBus"; |
51038c03 | 1005 | |
cb67f718 DM |
1006 | r = bus_seal_synthetic_message(bus, m); |
1007 | if (r < 0) | |
1008 | return r; | |
6629161f | 1009 | |
7adc46fc | 1010 | bus->rqueue[bus->rqueue_size++] = m; |
cb67f718 | 1011 | m = NULL; |
7d22c717 | 1012 | |
6629161f | 1013 | return 1; |
cb67f718 | 1014 | } |
1307c3ff | 1015 | |
cb67f718 DM |
1016 | static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) { |
1017 | struct kdbus_item *d, *found = NULL; | |
1307c3ff | 1018 | |
cb67f718 DM |
1019 | static int (* const translate[])(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) = { |
1020 | [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1021 | [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1022 | [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1307c3ff | 1023 | |
cb67f718 DM |
1024 | [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, |
1025 | [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, | |
1026 | ||
1027 | [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1028 | [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1029 | }; | |
1030 | ||
1031 | assert(bus); | |
1032 | assert(k); | |
1033 | assert(k->payload_type == KDBUS_PAYLOAD_KERNEL); | |
1034 | ||
1035 | KDBUS_ITEM_FOREACH(d, k, items) { | |
1036 | if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) { | |
1037 | if (found) | |
1038 | return -EBADMSG; | |
1039 | found = d; | |
1040 | } else | |
1041 | log_debug("Got unknown field from kernel %llu", d->type); | |
1307c3ff LP |
1042 | } |
1043 | ||
cb67f718 DM |
1044 | if (!found) { |
1045 | log_debug("Didn't find a kernel message to translate."); | |
1046 | return 0; | |
1047 | } | |
1048 | ||
1049 | return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found); | |
6629161f LP |
1050 | } |
1051 | ||
766c5809 | 1052 | int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) { |
9ff1897b | 1053 | struct kdbus_cmd_recv recv = {}; |
6629161f | 1054 | struct kdbus_msg *k; |
6629161f LP |
1055 | int r; |
1056 | ||
1057 | assert(bus); | |
7d22c717 | 1058 | |
7adc46fc | 1059 | r = bus_rqueue_make_room(bus); |
7d22c717 LP |
1060 | if (r < 0) |
1061 | return r; | |
6629161f | 1062 | |
766c5809 LP |
1063 | if (hint_priority) { |
1064 | recv.flags |= KDBUS_RECV_USE_PRIORITY; | |
1065 | recv.priority = priority; | |
1066 | } | |
1067 | ||
9ff1897b | 1068 | r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &recv); |
fd8d62d9 | 1069 | if (r < 0) { |
6629161f LP |
1070 | if (errno == EAGAIN) |
1071 | return 0; | |
1072 | ||
fd8d62d9 | 1073 | return -errno; |
6629161f LP |
1074 | } |
1075 | ||
069f5e61 | 1076 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.offset); |
e1d337d4 | 1077 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
7d22c717 | 1078 | r = bus_kernel_make_message(bus, k); |
e1d337d4 LP |
1079 | |
1080 | /* Anybody can send us invalid messages, let's just drop them. */ | |
1081 | if (r == -EBADMSG || r == -EPROTOTYPE) { | |
ff4994c5 | 1082 | log_debug("Ignoring invalid message: %s", strerror(-r)); |
e1d337d4 LP |
1083 | r = 0; |
1084 | } | |
1085 | ||
1086 | } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) | |
7d22c717 | 1087 | r = bus_kernel_translate_message(bus, k); |
069f5e61 LP |
1088 | else { |
1089 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
777d7a61 | 1090 | r = 0; |
069f5e61 | 1091 | } |
777d7a61 | 1092 | |
fd8d62d9 LP |
1093 | if (r <= 0) |
1094 | close_kdbus_msg(bus, k); | |
6629161f | 1095 | |
51038c03 | 1096 | return r < 0 ? r : 1; |
6629161f LP |
1097 | } |
1098 | ||
8e959fbf | 1099 | int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) { |
bc7fd8cd | 1100 | struct memfd_cache *c; |
45fbe937 | 1101 | int fd; |
bc7fd8cd LP |
1102 | |
1103 | assert(address); | |
8e959fbf LP |
1104 | assert(mapped); |
1105 | assert(allocated); | |
35460afc LP |
1106 | |
1107 | if (!bus || !bus->is_kernel) | |
1108 | return -ENOTSUP; | |
bc7fd8cd | 1109 | |
76b7742c | 1110 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
45fbe937 | 1111 | |
bc7fd8cd | 1112 | if (bus->n_memfd_cache <= 0) { |
8d1db1d1 LP |
1113 | _cleanup_free_ char *g = NULL; |
1114 | struct kdbus_cmd_memfd_make *cmd; | |
1115 | struct kdbus_item *item; | |
1116 | size_t l, sz; | |
45fbe937 LP |
1117 | int r; |
1118 | ||
76b7742c | 1119 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1120 | |
8d1db1d1 LP |
1121 | assert(bus->connection_name); |
1122 | ||
a6278b88 | 1123 | g = bus_label_escape(bus->connection_name); |
8d1db1d1 LP |
1124 | if (!g) |
1125 | return -ENOMEM; | |
1126 | ||
1127 | l = strlen(g); | |
1128 | sz = ALIGN8(offsetof(struct kdbus_cmd_memfd_make, items)) + | |
1129 | ALIGN8(offsetof(struct kdbus_item, str)) + | |
1130 | l + 1; | |
1131 | cmd = alloca0(sz); | |
1132 | cmd->size = sz; | |
1133 | ||
1134 | item = cmd->items; | |
1135 | item->size = ALIGN8(offsetof(struct kdbus_item, str)) + l + 1; | |
1136 | item->type = KDBUS_ITEM_MEMFD_NAME; | |
1137 | memcpy(item->str, g, l + 1); | |
1138 | ||
1139 | r = ioctl(bus->input_fd, KDBUS_CMD_MEMFD_NEW, cmd); | |
9b05bc48 | 1140 | if (r < 0) |
bc7fd8cd LP |
1141 | return -errno; |
1142 | ||
1143 | *address = NULL; | |
8e959fbf LP |
1144 | *mapped = 0; |
1145 | *allocated = 0; | |
8d1db1d1 | 1146 | return cmd->fd; |
bc7fd8cd LP |
1147 | } |
1148 | ||
bf30e48f | 1149 | c = &bus->memfd_cache[--bus->n_memfd_cache]; |
bc7fd8cd LP |
1150 | |
1151 | assert(c->fd >= 0); | |
8e959fbf | 1152 | assert(c->mapped == 0 || c->address); |
bc7fd8cd LP |
1153 | |
1154 | *address = c->address; | |
8e959fbf LP |
1155 | *mapped = c->mapped; |
1156 | *allocated = c->allocated; | |
45fbe937 LP |
1157 | fd = c->fd; |
1158 | ||
76b7742c | 1159 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1160 | |
45fbe937 LP |
1161 | return fd; |
1162 | } | |
1163 | ||
1164 | static void close_and_munmap(int fd, void *address, size_t size) { | |
1165 | if (size > 0) | |
76b7742c | 1166 | assert_se(munmap(address, PAGE_ALIGN(size)) >= 0); |
45fbe937 | 1167 | |
03e334a1 | 1168 | safe_close(fd); |
bc7fd8cd LP |
1169 | } |
1170 | ||
8e959fbf | 1171 | void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) { |
bc7fd8cd | 1172 | struct memfd_cache *c; |
8e959fbf | 1173 | uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX); |
bc7fd8cd LP |
1174 | |
1175 | assert(fd >= 0); | |
8e959fbf | 1176 | assert(mapped == 0 || address); |
bc7fd8cd | 1177 | |
45fbe937 | 1178 | if (!bus || !bus->is_kernel) { |
8e959fbf | 1179 | close_and_munmap(fd, address, mapped); |
45fbe937 LP |
1180 | return; |
1181 | } | |
1182 | ||
76b7742c | 1183 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1184 | |
45fbe937 | 1185 | if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) { |
76b7742c | 1186 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1187 | |
8e959fbf | 1188 | close_and_munmap(fd, address, mapped); |
bc7fd8cd LP |
1189 | return; |
1190 | } | |
1191 | ||
1192 | c = &bus->memfd_cache[bus->n_memfd_cache++]; | |
1193 | c->fd = fd; | |
1194 | c->address = address; | |
1195 | ||
1196 | /* If overly long, let's return a bit to the OS */ | |
8e959fbf LP |
1197 | if (mapped > max_mapped) { |
1198 | assert_se(ioctl(fd, KDBUS_CMD_MEMFD_SIZE_SET, &max_mapped) >= 0); | |
1199 | assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0); | |
1200 | c->mapped = c->allocated = max_mapped; | |
1201 | } else { | |
1202 | c->mapped = mapped; | |
1203 | c->allocated = allocated; | |
1204 | } | |
45fbe937 | 1205 | |
76b7742c | 1206 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd LP |
1207 | } |
1208 | ||
1209 | void bus_kernel_flush_memfd(sd_bus *b) { | |
1210 | unsigned i; | |
1211 | ||
1212 | assert(b); | |
1213 | ||
76b7742c | 1214 | for (i = 0; i < b->n_memfd_cache; i++) |
8e959fbf | 1215 | close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped); |
bc7fd8cd | 1216 | } |
0253ddcc | 1217 | |
e3dd987c LP |
1218 | int kdbus_translate_request_name_flags(uint64_t flags, uint64_t *kdbus_flags) { |
1219 | uint64_t f = 0; | |
0253ddcc | 1220 | |
e3dd987c | 1221 | assert(kdbus_flags); |
0253ddcc | 1222 | |
e3dd987c LP |
1223 | if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT) |
1224 | f |= KDBUS_NAME_ALLOW_REPLACEMENT; | |
0253ddcc | 1225 | |
e3dd987c LP |
1226 | if (flags & SD_BUS_NAME_REPLACE_EXISTING) |
1227 | f |= KDBUS_NAME_REPLACE_EXISTING; | |
0253ddcc | 1228 | |
d90bb669 | 1229 | if (flags & SD_BUS_NAME_QUEUE) |
e3dd987c | 1230 | f |= KDBUS_NAME_QUEUE; |
0253ddcc | 1231 | |
e3dd987c LP |
1232 | *kdbus_flags = f; |
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | int kdbus_translate_attach_flags(uint64_t mask, uint64_t *kdbus_mask) { | |
1237 | uint64_t m = 0; | |
1238 | ||
1239 | assert(kdbus_mask); | |
1240 | ||
1241 | if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID)) | |
1242 | m |= KDBUS_ATTACH_CREDS; | |
1243 | ||
1244 | if (mask & (SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM)) | |
1245 | m |= KDBUS_ATTACH_COMM; | |
1246 | ||
1247 | if (mask & SD_BUS_CREDS_EXE) | |
1248 | m |= KDBUS_ATTACH_EXE; | |
1249 | ||
1250 | if (mask & SD_BUS_CREDS_CMDLINE) | |
1251 | m |= KDBUS_ATTACH_CMDLINE; | |
1252 | ||
1253 | 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)) | |
1254 | m |= KDBUS_ATTACH_CGROUP; | |
1255 | ||
1256 | if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) | |
1257 | m |= KDBUS_ATTACH_CAPS; | |
1258 | ||
1259 | if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) | |
1260 | m |= KDBUS_ATTACH_SECLABEL; | |
0253ddcc | 1261 | |
e3dd987c LP |
1262 | if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) |
1263 | m |= KDBUS_ATTACH_AUDIT; | |
1264 | ||
49b832c5 LP |
1265 | if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) |
1266 | m |= KDBUS_ATTACH_NAMES; | |
1267 | ||
cccb0b2c LP |
1268 | if (mask & SD_BUS_CREDS_CONNECTION_NAME) |
1269 | m |= KDBUS_ATTACH_CONN_NAME; | |
1270 | ||
e3dd987c | 1271 | *kdbus_mask = m; |
0253ddcc DM |
1272 | return 0; |
1273 | } | |
e3dd987c | 1274 | |
f2769777 | 1275 | int bus_kernel_create_bus(const char *name, bool world, char **s) { |
816a3f9e | 1276 | struct kdbus_cmd_make *make; |
e3dd987c LP |
1277 | struct kdbus_item *n; |
1278 | int fd; | |
1279 | ||
1280 | assert(name); | |
1281 | assert(s); | |
1282 | ||
1283 | fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1284 | if (fd < 0) | |
1285 | return -errno; | |
1286 | ||
816a3f9e DM |
1287 | make = alloca0(ALIGN8(offsetof(struct kdbus_cmd_make, items) + |
1288 | offsetof(struct kdbus_item, data64) + sizeof(uint64_t) + | |
e3dd987c LP |
1289 | offsetof(struct kdbus_item, str) + |
1290 | DECIMAL_STR_MAX(uid_t) + 1 + strlen(name) + 1)); | |
1291 | ||
816a3f9e DM |
1292 | make->size = offsetof(struct kdbus_cmd_make, items); |
1293 | ||
e3dd987c | 1294 | n = make->items; |
18a28147 KS |
1295 | n->size = offsetof(struct kdbus_item, bloom_parameter) + |
1296 | sizeof(struct kdbus_bloom_parameter); | |
1297 | n->type = KDBUS_ITEM_BLOOM_PARAMETER; | |
b28ff39f LP |
1298 | |
1299 | n->bloom_parameter.size = DEFAULT_BLOOM_SIZE; | |
1300 | n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH; | |
1301 | ||
1302 | assert_cc(DEFAULT_BLOOM_SIZE > 0); | |
1303 | assert_cc(DEFAULT_BLOOM_N_HASH > 0); | |
1304 | ||
816a3f9e DM |
1305 | make->size += ALIGN8(n->size); |
1306 | ||
1307 | n = KDBUS_ITEM_NEXT(n); | |
e3dd987c LP |
1308 | sprintf(n->str, "%lu-%s", (unsigned long) getuid(), name); |
1309 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
5e16c257 | 1310 | n->type = KDBUS_ITEM_MAKE_NAME; |
816a3f9e | 1311 | make->size += ALIGN8(n->size); |
e3dd987c | 1312 | |
f7c7cd03 | 1313 | make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0; |
e3dd987c LP |
1314 | |
1315 | if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { | |
03e334a1 | 1316 | safe_close(fd); |
e3dd987c LP |
1317 | return -errno; |
1318 | } | |
1319 | ||
f9638db8 LP |
1320 | /* The higher 32bit of the flags field are considered |
1321 | * 'incompatible flags'. Refuse them all for now. */ | |
1322 | if (make->flags > 0xFFFFFFFFULL) { | |
03e334a1 | 1323 | safe_close(fd); |
f9638db8 LP |
1324 | return -ENOTSUP; |
1325 | } | |
1326 | ||
e3dd987c LP |
1327 | if (s) { |
1328 | char *p; | |
1329 | ||
1330 | p = strjoin("/dev/kdbus/", n->str, "/bus", NULL); | |
1331 | if (!p) { | |
03e334a1 | 1332 | safe_close(fd); |
e3dd987c LP |
1333 | return -ENOMEM; |
1334 | } | |
1335 | ||
1336 | *s = p; | |
1337 | } | |
1338 | ||
1339 | return fd; | |
1340 | } | |
9bd37b40 | 1341 | |
1683342a DM |
1342 | static void bus_kernel_translate_policy(const BusNamePolicy *policy, struct kdbus_item *item) |
1343 | { | |
1344 | switch (policy->type) { | |
1345 | case BUSNAME_POLICY_TYPE_USER: | |
1346 | item->policy_access.type = KDBUS_POLICY_ACCESS_USER; | |
1347 | item->policy_access.id = policy->uid; | |
1348 | break; | |
1349 | ||
1350 | case BUSNAME_POLICY_TYPE_GROUP: | |
1351 | item->policy_access.type = KDBUS_POLICY_ACCESS_GROUP; | |
1352 | item->policy_access.id = policy->gid; | |
1353 | break; | |
1354 | ||
1355 | case BUSNAME_POLICY_TYPE_WORLD: | |
1356 | item->policy_access.type = KDBUS_POLICY_ACCESS_WORLD; | |
1357 | break; | |
1358 | ||
1359 | default: | |
1360 | assert_not_reached("Unknown policy type"); | |
1361 | } | |
1362 | ||
1363 | switch (policy->access) { | |
1364 | case BUSNAME_POLICY_ACCESS_SEE: | |
1365 | item->policy_access.access = KDBUS_POLICY_SEE; | |
1366 | break; | |
1367 | ||
1368 | case BUSNAME_POLICY_ACCESS_TALK: | |
1369 | item->policy_access.access = KDBUS_POLICY_TALK; | |
1370 | break; | |
1371 | ||
1372 | case BUSNAME_POLICY_ACCESS_OWN: | |
1373 | item->policy_access.access = KDBUS_POLICY_OWN; | |
1374 | break; | |
1375 | ||
1376 | default: | |
1377 | assert_not_reached("Unknown policy access"); | |
1378 | } | |
1379 | } | |
1380 | ||
5892a914 | 1381 | int bus_kernel_create_starter(const char *bus, const char *name, bool activating, bool accept_fd, BusNamePolicy *policy) { |
e821075a LP |
1382 | struct kdbus_cmd_hello *hello; |
1383 | struct kdbus_item *n; | |
1683342a DM |
1384 | size_t policy_cnt = 0; |
1385 | BusNamePolicy *po; | |
1386 | size_t size; | |
e821075a LP |
1387 | char *p; |
1388 | int fd; | |
1389 | ||
1390 | assert(bus); | |
1391 | assert(name); | |
1392 | ||
f8294e41 | 1393 | p = alloca(strlen("/dev/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1); |
e821075a LP |
1394 | sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus); |
1395 | ||
1396 | fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1397 | if (fd < 0) | |
1398 | return -errno; | |
1399 | ||
1683342a DM |
1400 | LIST_FOREACH(policy, po, policy) |
1401 | policy_cnt++; | |
1402 | ||
1403 | size = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) + | |
1404 | ALIGN8(offsetof(struct kdbus_item, str) + strlen(name) + 1) + | |
1405 | policy_cnt * ALIGN8(offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access)); | |
1406 | ||
1407 | hello = alloca0(size); | |
e821075a LP |
1408 | |
1409 | n = hello->items; | |
1410 | strcpy(n->str, name); | |
1411 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
613ec4b8 | 1412 | n->type = KDBUS_ITEM_NAME; |
1683342a DM |
1413 | n = KDBUS_ITEM_NEXT(n); |
1414 | ||
1415 | LIST_FOREACH(policy, po, policy) { | |
1416 | n->type = KDBUS_ITEM_POLICY_ACCESS; | |
1417 | n->size = offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access); | |
1418 | bus_kernel_translate_policy(po, n); | |
1419 | n = KDBUS_ITEM_NEXT(n); | |
1420 | } | |
e821075a | 1421 | |
1683342a | 1422 | hello->size = size; |
5892a914 DM |
1423 | hello->conn_flags = |
1424 | (activating ? KDBUS_HELLO_ACTIVATOR : KDBUS_HELLO_POLICY_HOLDER) | | |
1425 | (accept_fd ? KDBUS_HELLO_ACCEPT_FD : 0); | |
e821075a | 1426 | hello->pool_size = KDBUS_POOL_SIZE; |
d2e7b05f | 1427 | hello->attach_flags = _KDBUS_ATTACH_ALL; |
e821075a LP |
1428 | |
1429 | if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) { | |
03e334a1 | 1430 | safe_close(fd); |
e821075a LP |
1431 | return -errno; |
1432 | } | |
1433 | ||
1434 | /* The higher 32bit of both flags fields are considered | |
1435 | * 'incompatible flags'. Refuse them all for now. */ | |
1436 | if (hello->bus_flags > 0xFFFFFFFFULL || | |
1437 | hello->conn_flags > 0xFFFFFFFFULL) { | |
03e334a1 | 1438 | safe_close(fd); |
e821075a LP |
1439 | return -ENOTSUP; |
1440 | } | |
1441 | ||
b28ff39f | 1442 | if (!bloom_validate_parameters((size_t) hello->bloom.size, (unsigned) hello->bloom.n_hash)) { |
03e334a1 | 1443 | safe_close(fd); |
e821075a LP |
1444 | return -ENOTSUP; |
1445 | } | |
1446 | ||
1447 | return fd; | |
1448 | } | |
1449 | ||
486e99a3 | 1450 | int bus_kernel_create_domain(const char *name, char **s) { |
816a3f9e | 1451 | struct kdbus_cmd_make *make; |
9bd37b40 LP |
1452 | struct kdbus_item *n; |
1453 | int fd; | |
1454 | ||
1455 | assert(name); | |
1456 | assert(s); | |
1457 | ||
1458 | fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1459 | if (fd < 0) | |
1460 | return -errno; | |
1461 | ||
816a3f9e | 1462 | make = alloca0(ALIGN8(offsetof(struct kdbus_cmd_make, items) + |
9bd37b40 LP |
1463 | offsetof(struct kdbus_item, str) + |
1464 | strlen(name) + 1)); | |
1465 | ||
1466 | n = make->items; | |
1467 | strcpy(n->str, name); | |
1468 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
5e16c257 | 1469 | n->type = KDBUS_ITEM_MAKE_NAME; |
9bd37b40 | 1470 | |
816a3f9e | 1471 | make->size = ALIGN8(offsetof(struct kdbus_cmd_make, items) + n->size); |
f7c7cd03 | 1472 | make->flags = KDBUS_MAKE_ACCESS_WORLD; |
9bd37b40 | 1473 | |
486e99a3 | 1474 | if (ioctl(fd, KDBUS_CMD_DOMAIN_MAKE, make) < 0) { |
03e334a1 | 1475 | safe_close(fd); |
9bd37b40 LP |
1476 | return -errno; |
1477 | } | |
1478 | ||
f9638db8 LP |
1479 | /* The higher 32bit of the flags field are considered |
1480 | * 'incompatible flags'. Refuse them all for now. */ | |
1481 | if (make->flags > 0xFFFFFFFFULL) { | |
03e334a1 | 1482 | safe_close(fd); |
f9638db8 LP |
1483 | return -ENOTSUP; |
1484 | } | |
1485 | ||
9bd37b40 LP |
1486 | if (s) { |
1487 | char *p; | |
1488 | ||
486e99a3 | 1489 | p = strappend("/dev/kdbus/domain/", name); |
9bd37b40 | 1490 | if (!p) { |
03e334a1 | 1491 | safe_close(fd); |
9bd37b40 LP |
1492 | return -ENOMEM; |
1493 | } | |
1494 | ||
1495 | *s = p; | |
1496 | } | |
1497 | ||
1498 | return fd; | |
1499 | } | |
c8fa3f60 | 1500 | |
b6c631f3 KS |
1501 | int bus_kernel_create_monitor(const char *bus) { |
1502 | struct kdbus_cmd_hello *hello; | |
1503 | char *p; | |
1504 | int fd; | |
c8fa3f60 LS |
1505 | |
1506 | assert(bus); | |
1507 | ||
f8294e41 | 1508 | p = alloca(strlen("/dev/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1); |
b6c631f3 | 1509 | sprintf(p, "/dev/kdbus/%lu-%s/bus", (unsigned long) getuid(), bus); |
c8fa3f60 | 1510 | |
b6c631f3 KS |
1511 | fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); |
1512 | if (fd < 0) | |
c8fa3f60 LS |
1513 | return -errno; |
1514 | ||
b6c631f3 KS |
1515 | hello = alloca0(sizeof(struct kdbus_cmd_hello)); |
1516 | hello->size = sizeof(struct kdbus_cmd_hello); | |
1517 | hello->conn_flags = KDBUS_HELLO_ACTIVATOR; | |
1518 | hello->pool_size = KDBUS_POOL_SIZE; | |
1519 | ||
1520 | if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) { | |
03e334a1 | 1521 | safe_close(fd); |
b6c631f3 KS |
1522 | return -errno; |
1523 | } | |
1524 | ||
1525 | /* The higher 32bit of both flags fields are considered | |
1526 | * 'incompatible flags'. Refuse them all for now. */ | |
1527 | if (hello->bus_flags > 0xFFFFFFFFULL || | |
1528 | hello->conn_flags > 0xFFFFFFFFULL) { | |
03e334a1 | 1529 | safe_close(fd); |
b6c631f3 KS |
1530 | return -ENOTSUP; |
1531 | } | |
1532 | ||
1533 | return fd; | |
c8fa3f60 | 1534 | } |
ae095f86 LP |
1535 | |
1536 | int bus_kernel_try_close(sd_bus *bus) { | |
1537 | assert(bus); | |
1538 | assert(bus->is_kernel); | |
1539 | ||
1540 | if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE) < 0) | |
1541 | return -errno; | |
1542 | ||
1543 | return 0; | |
1544 | } | |
ff975efb LP |
1545 | |
1546 | int bus_kernel_drop_one(int fd) { | |
1547 | struct kdbus_cmd_recv recv = { | |
1548 | .flags = KDBUS_RECV_DROP | |
1549 | }; | |
1550 | ||
1551 | assert(fd >= 0); | |
1552 | ||
1553 | if (ioctl(fd, KDBUS_CMD_MSG_RECV, &recv) < 0) | |
1554 | return -errno; | |
1555 | ||
1556 | return 0; | |
1557 | } |