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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> |
e7d718af | 28 | #include <libgen.h> |
fd8d62d9 | 29 | #include <sys/mman.h> |
5972fe95 | 30 | #include <sys/prctl.h> |
6629161f LP |
31 | |
32 | #include "util.h" | |
65dae17a | 33 | #include "strv.h" |
6629161f LP |
34 | |
35 | #include "bus-internal.h" | |
36 | #include "bus-message.h" | |
37 | #include "bus-kernel.h" | |
a56f19c4 | 38 | #include "bus-bloom.h" |
777d7a61 | 39 | #include "bus-util.h" |
a6278b88 | 40 | #include "bus-label.h" |
751bc6ac | 41 | #include "cgroup-util.h" |
777d7a61 LP |
42 | |
43 | #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t)) | |
6629161f | 44 | |
c7819669 | 45 | int bus_kernel_parse_unique_name(const char *s, uint64_t *id) { |
6629161f LP |
46 | int r; |
47 | ||
48 | assert(s); | |
49 | assert(id); | |
50 | ||
51 | if (!startswith(s, ":1.")) | |
52 | return 0; | |
53 | ||
54 | r = safe_atou64(s + 3, id); | |
55 | if (r < 0) | |
56 | return r; | |
57 | ||
58 | return 1; | |
59 | } | |
60 | ||
febfd508 | 61 | static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) { |
6629161f | 62 | assert(d); |
6629161f LP |
63 | assert(sz > 0); |
64 | ||
e86b80b8 LP |
65 | *d = ALIGN8_PTR(*d); |
66 | ||
66b26c5c LP |
67 | /* Note that p can be NULL, which encodes a region full of |
68 | * zeroes, which is useful to optimize certain padding | |
69 | * conditions */ | |
70 | ||
febfd508 | 71 | (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec); |
ea1edece | 72 | (*d)->type = KDBUS_ITEM_PAYLOAD_VEC; |
a392d361 | 73 | (*d)->vec.address = PTR_TO_UINT64(p); |
6629161f LP |
74 | (*d)->vec.size = sz; |
75 | ||
febfd508 | 76 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
77 | } |
78 | ||
a392d361 LP |
79 | static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t sz) { |
80 | assert(d); | |
81 | assert(memfd >= 0); | |
82 | assert(sz > 0); | |
83 | ||
84 | *d = ALIGN8_PTR(*d); | |
85 | (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd); | |
ea1edece | 86 | (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD; |
a392d361 LP |
87 | (*d)->memfd.fd = memfd; |
88 | (*d)->memfd.size = sz; | |
89 | ||
90 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); | |
91 | } | |
92 | ||
febfd508 | 93 | static void append_destination(struct kdbus_item **d, const char *s, size_t length) { |
6629161f | 94 | assert(d); |
b5baa8fe | 95 | assert(s); |
6629161f | 96 | |
e86b80b8 LP |
97 | *d = ALIGN8_PTR(*d); |
98 | ||
febfd508 | 99 | (*d)->size = offsetof(struct kdbus_item, str) + length + 1; |
ea1edece | 100 | (*d)->type = KDBUS_ITEM_DST_NAME; |
51038c03 | 101 | memcpy((*d)->str, s, length + 1); |
6629161f | 102 | |
febfd508 | 103 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
104 | } |
105 | ||
18a28147 KS |
106 | static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) { |
107 | struct kdbus_item *i; | |
a56f19c4 | 108 | |
b5baa8fe | 109 | assert(d); |
b5baa8fe | 110 | |
18a28147 | 111 | i = ALIGN8_PTR(*d); |
b5baa8fe | 112 | |
18a28147 KS |
113 | i->size = offsetof(struct kdbus_item, bloom_filter) + |
114 | offsetof(struct kdbus_bloom_filter, data) + | |
115 | length; | |
116 | i->type = KDBUS_ITEM_BLOOM_FILTER; | |
b5baa8fe | 117 | |
18a28147 | 118 | *d = (struct kdbus_item *) ((uint8_t*) i + i->size); |
a56f19c4 | 119 | |
18a28147 | 120 | return &i->bloom_filter; |
a56f19c4 LP |
121 | } |
122 | ||
febfd508 | 123 | static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) { |
9097fe29 LP |
124 | assert(d); |
125 | assert(fds); | |
126 | assert(n_fds > 0); | |
127 | ||
128 | *d = ALIGN8_PTR(*d); | |
febfd508 | 129 | (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds; |
ea1edece | 130 | (*d)->type = KDBUS_ITEM_FDS; |
9097fe29 LP |
131 | memcpy((*d)->fds, fds, sizeof(int) * n_fds); |
132 | ||
febfd508 | 133 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
9097fe29 LP |
134 | } |
135 | ||
18a28147 KS |
136 | static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) { |
137 | void *data; | |
a56f19c4 LP |
138 | unsigned i; |
139 | int r; | |
140 | ||
141 | assert(m); | |
142 | assert(bloom); | |
143 | ||
18a28147 | 144 | data = bloom->data; |
29804cc1 | 145 | memzero(data, m->bus->bloom_size); |
18a28147 | 146 | bloom->generation = 0; |
a56f19c4 | 147 | |
b28ff39f | 148 | 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 |
149 | |
150 | if (m->interface) | |
b28ff39f | 151 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface); |
a56f19c4 | 152 | if (m->member) |
b28ff39f | 153 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member); |
a56f19c4 | 154 | if (m->path) { |
b28ff39f LP |
155 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path); |
156 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path); | |
157 | bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/'); | |
a56f19c4 LP |
158 | } |
159 | ||
160 | r = sd_bus_message_rewind(m, true); | |
161 | if (r < 0) | |
162 | return r; | |
163 | ||
164 | for (i = 0; i < 64; i++) { | |
165 | char type; | |
166 | const char *t; | |
167 | char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")]; | |
168 | char *e; | |
169 | ||
170 | r = sd_bus_message_peek_type(m, &type, NULL); | |
171 | if (r < 0) | |
172 | return r; | |
173 | ||
174 | if (type != SD_BUS_TYPE_STRING && | |
175 | type != SD_BUS_TYPE_OBJECT_PATH && | |
176 | type != SD_BUS_TYPE_SIGNATURE) | |
177 | break; | |
178 | ||
179 | r = sd_bus_message_read_basic(m, type, &t); | |
180 | if (r < 0) | |
181 | return r; | |
182 | ||
183 | e = stpcpy(buf, "arg"); | |
184 | if (i < 10) | |
693eb9a2 | 185 | *(e++) = '0' + (char) i; |
a56f19c4 | 186 | else { |
693eb9a2 LP |
187 | *(e++) = '0' + (char) (i / 10); |
188 | *(e++) = '0' + (char) (i % 10); | |
a56f19c4 LP |
189 | } |
190 | ||
191 | *e = 0; | |
b28ff39f | 192 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t); |
a56f19c4 LP |
193 | |
194 | strcpy(e, "-dot-prefix"); | |
b28ff39f | 195 | bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t, '.'); |
a56f19c4 | 196 | strcpy(e, "-slash-prefix"); |
b28ff39f | 197 | bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t, '/'); |
a56f19c4 LP |
198 | } |
199 | ||
200 | return 0; | |
b5baa8fe LP |
201 | } |
202 | ||
5b7d4c1c | 203 | static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { |
9b29bb68 | 204 | struct bus_body_part *part; |
febfd508 | 205 | struct kdbus_item *d; |
6629161f LP |
206 | bool well_known; |
207 | uint64_t unique; | |
208 | size_t sz, dl; | |
9b29bb68 | 209 | unsigned i; |
6629161f LP |
210 | int r; |
211 | ||
5b7d4c1c | 212 | assert(b); |
6629161f LP |
213 | assert(m); |
214 | assert(m->sealed); | |
e9a967f9 | 215 | |
069f5e61 LP |
216 | /* We put this together only once, if this message is reused |
217 | * we reuse the earlier-built version */ | |
e9a967f9 LP |
218 | if (m->kdbus) |
219 | return 0; | |
6629161f LP |
220 | |
221 | if (m->destination) { | |
c7819669 | 222 | r = bus_kernel_parse_unique_name(m->destination, &unique); |
6629161f LP |
223 | if (r < 0) |
224 | return r; | |
225 | ||
226 | well_known = r == 0; | |
227 | } else | |
228 | well_known = false; | |
229 | ||
b1454bf0 | 230 | sz = offsetof(struct kdbus_msg, items); |
6629161f | 231 | |
a392d361 LP |
232 | assert_cc(ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)) == |
233 | ALIGN8(offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd))); | |
234 | ||
69aec65c | 235 | /* Add in fixed header, fields header and payload */ |
c91cb83c | 236 | sz += (1 + m->n_body_parts) * |
bc7fd8cd | 237 | ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)); |
6629161f | 238 | |
69aec65c | 239 | /* Add space for bloom filter */ |
18a28147 KS |
240 | sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) + |
241 | offsetof(struct kdbus_bloom_filter, data) + | |
b28ff39f | 242 | m->bus->bloom_size); |
b5baa8fe | 243 | |
6629161f LP |
244 | /* Add in well-known destination header */ |
245 | if (well_known) { | |
246 | dl = strlen(m->destination); | |
febfd508 | 247 | sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1); |
6629161f LP |
248 | } |
249 | ||
9097fe29 LP |
250 | /* Add space for unix fds */ |
251 | if (m->n_fds > 0) | |
febfd508 | 252 | sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds); |
9097fe29 | 253 | |
c556fe79 | 254 | m->kdbus = memalign(8, sz); |
66b26c5c LP |
255 | if (!m->kdbus) { |
256 | r = -ENOMEM; | |
257 | goto fail; | |
258 | } | |
6629161f | 259 | |
66b26c5c | 260 | m->free_kdbus = true; |
29804cc1 | 261 | memzero(m->kdbus, sz); |
d9115e18 | 262 | |
6629161f | 263 | m->kdbus->flags = |
0461f8cd | 264 | ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) | |
97f82db3 | 265 | ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0); |
6629161f LP |
266 | m->kdbus->dst_id = |
267 | well_known ? 0 : | |
b5baa8fe | 268 | m->destination ? unique : KDBUS_DST_ID_BROADCAST; |
6647dc66 | 269 | m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; |
42c4ebcb | 270 | m->kdbus->cookie = (uint64_t) m->header->serial; |
ca7b42c8 | 271 | m->kdbus->priority = m->priority; |
80a33f11 KS |
272 | |
273 | if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) | |
693eb9a2 | 274 | m->kdbus->cookie_reply = m->reply_cookie; |
80a33f11 KS |
275 | else |
276 | m->kdbus->timeout_ns = m->timeout * NSEC_PER_USEC; | |
6629161f | 277 | |
b1454bf0 | 278 | d = m->kdbus->items; |
6629161f LP |
279 | |
280 | if (well_known) | |
281 | append_destination(&d, m->destination, dl); | |
282 | ||
c91cb83c | 283 | append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
a392d361 LP |
284 | |
285 | MESSAGE_FOREACH_PART(part, i, m) { | |
286 | if (part->is_zero) { | |
66b26c5c LP |
287 | /* If this is padding then simply send a |
288 | * vector with a NULL data pointer which the | |
289 | * kernel will just pass through. This is the | |
290 | * most efficient way to encode zeroes */ | |
291 | ||
a392d361 LP |
292 | append_payload_vec(&d, NULL, part->size); |
293 | continue; | |
294 | } | |
295 | ||
66b26c5c LP |
296 | if (part->memfd >= 0 && part->sealed && m->destination) { |
297 | /* Try to send a memfd, if the part is | |
298 | * sealed and this is not a broadcast. Since we can only */ | |
a392d361 | 299 | |
66b26c5c LP |
300 | append_payload_memfd(&d, part->memfd, part->size); |
301 | continue; | |
a392d361 LP |
302 | } |
303 | ||
73e231ab JE |
304 | /* Otherwise, let's send a vector to the actual data. |
305 | * For that, we need to map it first. */ | |
66b26c5c LP |
306 | r = bus_body_part_map(part); |
307 | if (r < 0) | |
308 | goto fail; | |
a392d361 | 309 | |
bc7fd8cd | 310 | append_payload_vec(&d, part->data, part->size); |
a392d361 | 311 | } |
6629161f | 312 | |
5b7d4c1c | 313 | if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) { |
18a28147 | 314 | struct kdbus_bloom_filter *bloom; |
5b7d4c1c | 315 | |
b28ff39f | 316 | bloom = append_bloom(&d, m->bus->bloom_size); |
18a28147 | 317 | r = bus_message_setup_bloom(m, bloom); |
a392d361 LP |
318 | if (r < 0) |
319 | goto fail; | |
5b7d4c1c | 320 | } |
b5baa8fe | 321 | |
9097fe29 LP |
322 | if (m->n_fds > 0) |
323 | append_fds(&d, m->fds, m->n_fds); | |
324 | ||
e9a967f9 | 325 | m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus; |
6629161f LP |
326 | assert(m->kdbus->size <= sz); |
327 | ||
328 | return 0; | |
a392d361 LP |
329 | |
330 | fail: | |
66b26c5c | 331 | m->poisoned = true; |
a392d361 | 332 | return r; |
6629161f LP |
333 | } |
334 | ||
125dd074 ZJS |
335 | static void unset_memfds(struct sd_bus_message *m) { |
336 | struct bus_body_part *part; | |
337 | unsigned i; | |
338 | ||
339 | assert(m); | |
340 | ||
341 | /* Make sure the memfds are not freed twice */ | |
342 | MESSAGE_FOREACH_PART(part, i, m) | |
343 | if (part->memfd >= 0) | |
344 | part->memfd = -1; | |
345 | } | |
346 | ||
cb67f718 DM |
347 | static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { |
348 | sd_bus_message *m = NULL; | |
349 | struct kdbus_item *d; | |
350 | unsigned n_fds = 0; | |
351 | _cleanup_free_ int *fds = NULL; | |
352 | struct bus_header *h = NULL; | |
353 | size_t total, n_bytes = 0, idx = 0; | |
354 | const char *destination = NULL, *seclabel = NULL; | |
6629161f LP |
355 | int r; |
356 | ||
cb67f718 DM |
357 | assert(bus); |
358 | assert(k); | |
359 | assert(k->payload_type == KDBUS_PAYLOAD_DBUS); | |
35460afc | 360 | |
cb67f718 DM |
361 | KDBUS_ITEM_FOREACH(d, k, items) { |
362 | size_t l; | |
f08838da | 363 | |
cb67f718 | 364 | l = d->size - offsetof(struct kdbus_item, data); |
8f155917 | 365 | |
cb67f718 | 366 | switch (d->type) { |
62b3e928 | 367 | |
cb67f718 DM |
368 | case KDBUS_ITEM_PAYLOAD_OFF: |
369 | if (!h) { | |
370 | h = (struct bus_header *)((uint8_t *)k + d->vec.offset); | |
8a0e0ed9 | 371 | |
cb67f718 DM |
372 | if (!bus_header_is_complete(h, d->vec.size)) |
373 | return -EBADMSG; | |
374 | } | |
8a0e0ed9 | 375 | |
cb67f718 DM |
376 | n_bytes += d->vec.size; |
377 | break; | |
8a0e0ed9 | 378 | |
cb67f718 DM |
379 | case KDBUS_ITEM_PAYLOAD_MEMFD: |
380 | if (!h) | |
381 | return -EBADMSG; | |
8a0e0ed9 | 382 | |
cb67f718 DM |
383 | n_bytes += d->memfd.size; |
384 | break; | |
8a0e0ed9 | 385 | |
cb67f718 DM |
386 | case KDBUS_ITEM_FDS: { |
387 | int *f; | |
388 | unsigned j; | |
8a0e0ed9 | 389 | |
cb67f718 DM |
390 | j = l / sizeof(int); |
391 | f = realloc(fds, sizeof(int) * (n_fds + j)); | |
392 | if (!f) | |
393 | return -ENOMEM; | |
8a0e0ed9 | 394 | |
cb67f718 DM |
395 | fds = f; |
396 | memcpy(fds + n_fds, d->fds, sizeof(int) * j); | |
397 | n_fds += j; | |
398 | break; | |
399 | } | |
62b3e928 | 400 | |
cb67f718 DM |
401 | case KDBUS_ITEM_SECLABEL: |
402 | seclabel = d->str; | |
403 | break; | |
fd8d62d9 LP |
404 | } |
405 | } | |
406 | ||
cb67f718 DM |
407 | if (!h) |
408 | return -EBADMSG; | |
de297575 | 409 | |
cb67f718 DM |
410 | r = bus_header_message_size(h, &total); |
411 | if (r < 0) | |
412 | return r; | |
219728b3 | 413 | |
cb67f718 DM |
414 | if (n_bytes != total) |
415 | return -EBADMSG; | |
6629161f | 416 | |
cb67f718 DM |
417 | /* on kdbus we only speak native endian gvariant, never dbus1 |
418 | * marshalling or reverse endian */ | |
419 | if (h->version != 2 || | |
420 | h->endian != BUS_NATIVE_ENDIAN) | |
421 | return -EPROTOTYPE; | |
c58dea19 | 422 | |
cb67f718 DM |
423 | r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m); |
424 | if (r < 0) | |
425 | return r; | |
6629161f | 426 | |
cb67f718 DM |
427 | /* The well-known names list is different from the other |
428 | credentials. If we asked for it, but nothing is there, this | |
429 | means that the list of well-known names is simply empty, not | |
430 | that we lack any data */ | |
35460afc | 431 | |
cb67f718 | 432 | m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask; |
f08838da | 433 | |
cb67f718 DM |
434 | KDBUS_ITEM_FOREACH(d, k, items) { |
435 | size_t l; | |
6629161f | 436 | |
cb67f718 | 437 | l = d->size - offsetof(struct kdbus_item, data); |
6629161f | 438 | |
cb67f718 | 439 | switch (d->type) { |
6629161f | 440 | |
cb67f718 DM |
441 | case KDBUS_ITEM_PAYLOAD_OFF: { |
442 | size_t begin_body; | |
6629161f | 443 | |
cb67f718 | 444 | begin_body = BUS_MESSAGE_BODY_BEGIN(m); |
6629161f | 445 | |
cb67f718 DM |
446 | if (idx + d->vec.size > begin_body) { |
447 | struct bus_body_part *part; | |
a43b9ca3 | 448 | |
cb67f718 | 449 | /* Contains body material */ |
6629161f | 450 | |
cb67f718 DM |
451 | part = message_append_part(m); |
452 | if (!part) { | |
453 | r = -ENOMEM; | |
454 | goto fail; | |
455 | } | |
a43b9ca3 | 456 | |
cb67f718 DM |
457 | /* A -1 offset is NUL padding. */ |
458 | part->is_zero = d->vec.offset == ~0ULL; | |
a43b9ca3 | 459 | |
cb67f718 DM |
460 | if (idx >= begin_body) { |
461 | if (!part->is_zero) | |
462 | part->data = (uint8_t *)k + d->vec.offset; | |
463 | part->size = d->vec.size; | |
464 | } else { | |
465 | if (!part->is_zero) | |
466 | part->data = (uint8_t *)k + d->vec.offset + (begin_body - idx); | |
467 | part->size = d->vec.size - (begin_body - idx); | |
468 | } | |
a43b9ca3 | 469 | |
cb67f718 | 470 | part->sealed = true; |
ff4994c5 | 471 | } |
a43b9ca3 | 472 | |
cb67f718 DM |
473 | idx += d->vec.size; |
474 | break; | |
475 | } | |
a43b9ca3 | 476 | |
cb67f718 DM |
477 | case KDBUS_ITEM_PAYLOAD_MEMFD: { |
478 | struct bus_body_part *part; | |
a43b9ca3 | 479 | |
cb67f718 DM |
480 | if (idx < BUS_MESSAGE_BODY_BEGIN(m)) { |
481 | r = -EBADMSG; | |
482 | goto fail; | |
ff4994c5 | 483 | } |
a43b9ca3 | 484 | |
cb67f718 DM |
485 | part = message_append_part(m); |
486 | if (!part) { | |
487 | r = -ENOMEM; | |
488 | goto fail; | |
489 | } | |
a43b9ca3 | 490 | |
cb67f718 DM |
491 | part->memfd = d->memfd.fd; |
492 | part->size = d->memfd.size; | |
493 | part->sealed = true; | |
a43b9ca3 | 494 | |
cb67f718 DM |
495 | idx += d->memfd.size; |
496 | break; | |
497 | } | |
a43b9ca3 | 498 | |
cb67f718 DM |
499 | case KDBUS_ITEM_CREDS: |
500 | /* UID/GID/PID are always valid */ | |
501 | m->creds.uid = (uid_t) d->creds.uid; | |
502 | m->creds.gid = (gid_t) d->creds.gid; | |
503 | m->creds.pid = (pid_t) d->creds.pid; | |
504 | m->creds.mask |= (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID) & bus->creds_mask; | |
a43b9ca3 | 505 | |
cb67f718 DM |
506 | /* The PID starttime/TID might be missing |
507 | * however, when the data is faked by some | |
508 | * data bus proxy and it lacks that | |
509 | * information about the real client since | |
510 | * SO_PEERCRED is used for that */ | |
6629161f | 511 | |
cb67f718 DM |
512 | if (d->creds.starttime > 0) { |
513 | m->creds.pid_starttime = d->creds.starttime / NSEC_PER_USEC; | |
514 | m->creds.mask |= SD_BUS_CREDS_PID_STARTTIME & bus->creds_mask; | |
515 | } | |
6629161f | 516 | |
cb67f718 DM |
517 | if (d->creds.tid > 0) { |
518 | m->creds.tid = (pid_t) d->creds.tid; | |
519 | m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask; | |
520 | } | |
521 | break; | |
6629161f | 522 | |
cb67f718 | 523 | case KDBUS_ITEM_TIMESTAMP: |
41add995 LP |
524 | |
525 | if (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) { | |
526 | m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC; | |
527 | m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC; | |
528 | m->seqnum = d->timestamp.seqnum; | |
529 | } | |
530 | ||
cb67f718 | 531 | break; |
fd8d62d9 | 532 | |
cb67f718 DM |
533 | case KDBUS_ITEM_PID_COMM: |
534 | m->creds.comm = d->str; | |
535 | m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask; | |
536 | break; | |
fd8d62d9 | 537 | |
cb67f718 DM |
538 | case KDBUS_ITEM_TID_COMM: |
539 | m->creds.tid_comm = d->str; | |
540 | m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask; | |
541 | break; | |
6629161f | 542 | |
cb67f718 DM |
543 | case KDBUS_ITEM_EXE: |
544 | m->creds.exe = d->str; | |
545 | m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask; | |
546 | break; | |
6629161f | 547 | |
cb67f718 DM |
548 | case KDBUS_ITEM_CMDLINE: |
549 | m->creds.cmdline = d->str; | |
550 | m->creds.cmdline_size = l; | |
551 | m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask; | |
552 | break; | |
777d7a61 | 553 | |
cb67f718 DM |
554 | case KDBUS_ITEM_CGROUP: |
555 | m->creds.cgroup = d->str; | |
556 | 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 | 557 | |
fe3f22d1 DK |
558 | r = bus_get_root_path(bus); |
559 | if (r < 0) | |
560 | goto fail; | |
777d7a61 | 561 | |
cb67f718 | 562 | m->creds.cgroup_root = bus->cgroup_root; |
777d7a61 | 563 | |
cb67f718 | 564 | break; |
777d7a61 | 565 | |
cb67f718 DM |
566 | case KDBUS_ITEM_AUDIT: |
567 | m->creds.audit_session_id = (uint32_t) d->audit.sessionid; | |
568 | m->creds.audit_login_uid = (uid_t) d->audit.loginuid; | |
569 | m->creds.mask |= (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID) & bus->creds_mask; | |
570 | break; | |
777d7a61 | 571 | |
cb67f718 DM |
572 | case KDBUS_ITEM_CAPS: |
573 | m->creds.capability = d->data; | |
574 | m->creds.capability_size = l; | |
575 | 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; | |
576 | break; | |
219728b3 | 577 | |
cb67f718 DM |
578 | case KDBUS_ITEM_DST_NAME: |
579 | if (!service_name_is_valid(d->str)) | |
580 | return -EBADMSG; | |
219728b3 | 581 | |
cb67f718 DM |
582 | destination = d->str; |
583 | break; | |
777d7a61 | 584 | |
cb67f718 DM |
585 | case KDBUS_ITEM_NAME: |
586 | if (!service_name_is_valid(d->name.name)) | |
587 | return -EBADMSG; | |
777d7a61 | 588 | |
cb67f718 DM |
589 | r = strv_extend(&m->creds.well_known_names, d->name.name); |
590 | if (r < 0) | |
591 | goto fail; | |
592 | break; | |
777d7a61 | 593 | |
cccb0b2c LP |
594 | case KDBUS_ITEM_CONN_NAME: |
595 | m->creds.conn_name = d->str; | |
596 | m->creds.mask |= SD_BUS_CREDS_CONNECTION_NAME & bus->creds_mask; | |
597 | break; | |
598 | ||
cb67f718 DM |
599 | case KDBUS_ITEM_FDS: |
600 | case KDBUS_ITEM_SECLABEL: | |
601 | break; | |
d78bf250 | 602 | |
cb67f718 DM |
603 | default: |
604 | log_debug("Got unknown field from kernel %llu", d->type); | |
605 | } | |
606 | } | |
d78bf250 | 607 | |
cb67f718 DM |
608 | r = bus_message_parse_fields(m); |
609 | if (r < 0) | |
610 | goto fail; | |
777d7a61 | 611 | |
cb67f718 DM |
612 | /* Override information from the user header with data from the kernel */ |
613 | if (k->src_id == KDBUS_SRC_ID_KERNEL) | |
614 | m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus"; | |
615 | else { | |
616 | snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id); | |
617 | m->sender = m->creds.unique_name = m->sender_buffer; | |
618 | } | |
777d7a61 | 619 | |
cb67f718 DM |
620 | if (destination) |
621 | m->destination = destination; | |
622 | else if (k->dst_id == KDBUS_DST_ID_BROADCAST) | |
623 | m->destination = NULL; | |
624 | else if (k->dst_id == KDBUS_DST_ID_NAME) | |
625 | m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */ | |
626 | else { | |
627 | snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id); | |
628 | m->destination = m->destination_buffer; | |
629 | } | |
777d7a61 | 630 | |
cb67f718 DM |
631 | /* We take possession of the kmsg struct now */ |
632 | m->kdbus = k; | |
633 | m->release_kdbus = true; | |
634 | m->free_fds = true; | |
635 | fds = NULL; | |
777d7a61 | 636 | |
cb67f718 | 637 | bus->rqueue[bus->rqueue_size++] = m; |
777d7a61 | 638 | |
cb67f718 | 639 | return 1; |
777d7a61 | 640 | |
cb67f718 | 641 | fail: |
125dd074 ZJS |
642 | unset_memfds(m); |
643 | sd_bus_message_unref(m); | |
777d7a61 | 644 | |
cb67f718 DM |
645 | return r; |
646 | } | |
777d7a61 | 647 | |
cb67f718 DM |
648 | int bus_kernel_take_fd(sd_bus *b) { |
649 | struct kdbus_cmd_hello *hello; | |
650 | struct kdbus_item *item; | |
5972fe95 LP |
651 | _cleanup_free_ char *g = NULL; |
652 | const char *name; | |
653 | size_t l = 0, m = 0, sz; | |
cb67f718 | 654 | int r; |
777d7a61 | 655 | |
cb67f718 | 656 | assert(b); |
7adc46fc | 657 | |
cb67f718 DM |
658 | if (b->is_server) |
659 | return -EINVAL; | |
777d7a61 | 660 | |
cb67f718 | 661 | b->use_memfd = 1; |
777d7a61 | 662 | |
5972fe95 | 663 | if (b->connection_name) { |
a6278b88 | 664 | g = bus_label_escape(b->connection_name); |
5972fe95 LP |
665 | if (!g) |
666 | return -ENOMEM; | |
667 | ||
668 | name = g; | |
669 | } else { | |
670 | char pr[17] = {}; | |
671 | ||
672 | /* If no name is explicitly set, we'll include a hint | |
673 | * indicating the library implementation, a hint which | |
674 | * kind of bus this is and the thread name */ | |
675 | ||
676 | assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0); | |
677 | ||
678 | if (isempty(pr)) { | |
679 | name = b->is_system ? "sd-system" : | |
680 | b->is_user ? "sd-user" : "sd"; | |
681 | } else { | |
682 | _cleanup_free_ char *e = NULL; | |
683 | ||
a6278b88 | 684 | e = bus_label_escape(pr); |
5972fe95 LP |
685 | if (!e) |
686 | return -ENOMEM; | |
687 | ||
688 | g = strappend(b->is_system ? "sd-system-" : | |
689 | b->is_user ? "sd-user-" : "sd-", | |
690 | e); | |
691 | if (!g) | |
692 | return -ENOMEM; | |
693 | ||
694 | name = g; | |
695 | } | |
696 | ||
a6278b88 | 697 | b->connection_name = bus_label_unescape(name); |
5972fe95 LP |
698 | if (!b->connection_name) |
699 | return -ENOMEM; | |
700 | } | |
701 | ||
702 | m = strlen(name); | |
703 | ||
704 | sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) + | |
705 | ALIGN8(offsetof(struct kdbus_item, str) + m + 1); | |
777d7a61 | 706 | |
cb67f718 | 707 | if (b->fake_creds_valid) |
5972fe95 | 708 | sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds)); |
777d7a61 | 709 | |
cb67f718 DM |
710 | if (b->fake_label) { |
711 | l = strlen(b->fake_label); | |
712 | sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1); | |
713 | } | |
777d7a61 | 714 | |
7f3d3ba1 | 715 | hello = alloca0_align(sz, 8); |
cb67f718 DM |
716 | hello->size = sz; |
717 | hello->conn_flags = b->hello_flags; | |
718 | hello->attach_flags = b->attach_flags; | |
719 | hello->pool_size = KDBUS_POOL_SIZE; | |
777d7a61 | 720 | |
cb67f718 DM |
721 | item = hello->items; |
722 | ||
5972fe95 LP |
723 | item->size = offsetof(struct kdbus_item, str) + m + 1; |
724 | item->type = KDBUS_ITEM_CONN_NAME; | |
725 | memcpy(item->str, name, m + 1); | |
726 | item = KDBUS_ITEM_NEXT(item); | |
727 | ||
cb67f718 DM |
728 | if (b->fake_creds_valid) { |
729 | item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds); | |
730 | item->type = KDBUS_ITEM_CREDS; | |
731 | item->creds = b->fake_creds; | |
732 | ||
733 | item = KDBUS_ITEM_NEXT(item); | |
777d7a61 LP |
734 | } |
735 | ||
cb67f718 DM |
736 | if (b->fake_label) { |
737 | item->size = offsetof(struct kdbus_item, str) + l + 1; | |
5972fe95 | 738 | item->type = KDBUS_ITEM_SECLABEL; |
cb67f718 | 739 | memcpy(item->str, b->fake_label, l+1); |
777d7a61 LP |
740 | } |
741 | ||
cb67f718 DM |
742 | r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello); |
743 | if (r < 0) | |
744 | return -errno; | |
777d7a61 | 745 | |
cb67f718 DM |
746 | if (!b->kdbus_buffer) { |
747 | b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0); | |
748 | if (b->kdbus_buffer == MAP_FAILED) { | |
749 | b->kdbus_buffer = NULL; | |
750 | return -errno; | |
751 | } | |
752 | } | |
6629161f | 753 | |
4a3e79e1 | 754 | /* The higher 32bit of the bus_flags fields are considered |
cb67f718 | 755 | * 'incompatible flags'. Refuse them all for now. */ |
4a3e79e1 | 756 | if (hello->bus_flags > 0xFFFFFFFFULL) |
cb67f718 | 757 | return -ENOTSUP; |
6629161f | 758 | |
b28ff39f | 759 | if (!bloom_validate_parameters((size_t) hello->bloom.size, (unsigned) hello->bloom.n_hash)) |
cb67f718 | 760 | return -ENOTSUP; |
6629161f | 761 | |
b28ff39f LP |
762 | b->bloom_size = (size_t) hello->bloom.size; |
763 | b->bloom_n_hash = (unsigned) hello->bloom.n_hash; | |
764 | ||
cb67f718 DM |
765 | if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) |
766 | return -ENOMEM; | |
6629161f | 767 | |
cb67f718 | 768 | b->unique_id = hello->id; |
6629161f | 769 | |
cb67f718 DM |
770 | b->is_kernel = true; |
771 | b->bus_client = true; | |
772 | b->can_fds = !!(hello->conn_flags & KDBUS_HELLO_ACCEPT_FD); | |
773 | b->message_version = 2; | |
774 | b->message_endian = BUS_NATIVE_ENDIAN; | |
c91cb83c | 775 | |
cb67f718 DM |
776 | /* the kernel told us the UUID of the underlying bus */ |
777 | memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes)); | |
6629161f | 778 | |
cb67f718 DM |
779 | return bus_start_running(b); |
780 | } | |
6629161f | 781 | |
cb67f718 DM |
782 | int bus_kernel_connect(sd_bus *b) { |
783 | assert(b); | |
784 | assert(b->input_fd < 0); | |
785 | assert(b->output_fd < 0); | |
786 | assert(b->kernel); | |
1307c3ff | 787 | |
cb67f718 DM |
788 | if (b->is_server) |
789 | return -EINVAL; | |
1307c3ff | 790 | |
cb67f718 DM |
791 | b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC); |
792 | if (b->input_fd < 0) | |
793 | return -errno; | |
6629161f | 794 | |
cb67f718 | 795 | b->output_fd = b->input_fd; |
6629161f | 796 | |
cb67f718 DM |
797 | return bus_kernel_take_fd(b); |
798 | } | |
f9be01f3 | 799 | |
069f5e61 | 800 | static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { |
d663f1b1 | 801 | struct kdbus_cmd_free cmd; |
069f5e61 LP |
802 | struct kdbus_item *d; |
803 | ||
804 | assert(bus); | |
805 | assert(k); | |
806 | ||
d663f1b1 DM |
807 | cmd.flags = 0; |
808 | cmd.offset = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer; | |
809 | ||
069f5e61 LP |
810 | KDBUS_ITEM_FOREACH(d, k, items) { |
811 | ||
812 | if (d->type == KDBUS_ITEM_FDS) | |
813 | close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int)); | |
814 | else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD) | |
03e334a1 | 815 | safe_close(d->memfd.fd); |
069f5e61 | 816 | } |
ca794c8e DM |
817 | |
818 | (void) ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd); | |
069f5e61 LP |
819 | } |
820 | ||
821 | int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) { | |
cb67f718 | 822 | int r; |
4a3e79e1 | 823 | uint64_t flags; |
6629161f | 824 | |
cb67f718 DM |
825 | assert(bus); |
826 | assert(m); | |
827 | assert(bus->state == BUS_RUNNING); | |
6629161f | 828 | |
cb67f718 DM |
829 | /* If we can't deliver, we want room for the error message */ |
830 | r = bus_rqueue_make_room(bus); | |
6629161f LP |
831 | if (r < 0) |
832 | return r; | |
833 | ||
cb67f718 | 834 | r = bus_message_setup_kmsg(bus, m); |
6629161f LP |
835 | if (r < 0) |
836 | return r; | |
837 | ||
069f5e61 LP |
838 | /* If this is a synchronous method call, then let's tell the |
839 | * kernel, so that it can pass CPU time/scheduling to the | |
840 | * destination for the time, if it wants to. If we | |
841 | * synchronously wait for the result anyway, we won't need CPU | |
842 | * anyway. */ | |
843 | if (hint_sync_call) | |
844 | m->kdbus->flags |= KDBUS_MSG_FLAGS_EXPECT_REPLY|KDBUS_MSG_FLAGS_SYNC_REPLY; | |
845 | ||
4a3e79e1 DM |
846 | /* The kernel will return the set of supported flags in m->kdbus->flags. |
847 | * Save the current message flags before issuing the ioctl, and restore them | |
848 | * afterwards */ | |
849 | flags = m->kdbus->flags; | |
cb67f718 | 850 | r = ioctl(bus->output_fd, KDBUS_CMD_MSG_SEND, m->kdbus); |
4a3e79e1 | 851 | m->kdbus->flags = flags; |
cb67f718 DM |
852 | if (r < 0) { |
853 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
854 | sd_bus_message *reply; | |
253ce82b | 855 | |
cb67f718 DM |
856 | if (errno == EAGAIN || errno == EINTR) |
857 | return 0; | |
858 | else if (errno == ENXIO || errno == ESRCH) { | |
6629161f | 859 | |
cb67f718 DM |
860 | /* ENXIO: unique name not known |
861 | * ESRCH: well-known name not known */ | |
6629161f | 862 | |
cb67f718 DM |
863 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
864 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Destination %s not known", m->destination); | |
865 | else { | |
866 | log_debug("Could not deliver message to %s as destination is not known. Ignoring.", m->destination); | |
867 | return 0; | |
868 | } | |
777d7a61 | 869 | |
cb67f718 | 870 | } else if (errno == EADDRNOTAVAIL) { |
fd8d62d9 | 871 | |
cb67f718 | 872 | /* EADDRNOTAVAIL: activation is possible, but turned off in request flags */ |
bc7fd8cd | 873 | |
cb67f718 DM |
874 | if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL) |
875 | sd_bus_error_setf(&error, SD_BUS_ERROR_SERVICE_UNKNOWN, "Activation of %s not requested", m->destination); | |
876 | else { | |
877 | log_debug("Could not deliver message to %s as destination is not activated. Ignoring.", m->destination); | |
878 | return 0; | |
879 | } | |
880 | } else | |
881 | return -errno; | |
bc7fd8cd | 882 | |
cb67f718 DM |
883 | r = bus_message_new_synthetic_error( |
884 | bus, | |
885 | BUS_MESSAGE_COOKIE(m), | |
886 | &error, | |
887 | &reply); | |
bc7fd8cd | 888 | |
cb67f718 DM |
889 | if (r < 0) |
890 | return r; | |
bc7fd8cd | 891 | |
cb67f718 DM |
892 | r = bus_seal_synthetic_message(bus, reply); |
893 | if (r < 0) | |
894 | return r; | |
62b3e928 | 895 | |
cb67f718 | 896 | bus->rqueue[bus->rqueue_size++] = reply; |
bc7fd8cd | 897 | |
069f5e61 LP |
898 | } else if (hint_sync_call) { |
899 | struct kdbus_msg *k; | |
fd8d62d9 | 900 | |
069f5e61 LP |
901 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + m->kdbus->offset_reply); |
902 | assert(k); | |
777d7a61 | 903 | |
069f5e61 | 904 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
1307c3ff | 905 | |
069f5e61 LP |
906 | r = bus_kernel_make_message(bus, k); |
907 | if (r < 0) { | |
908 | close_kdbus_msg(bus, k); | |
1307c3ff | 909 | |
069f5e61 LP |
910 | /* Anybody can send us invalid messages, let's just drop them. */ |
911 | if (r == -EBADMSG || r == -EPROTOTYPE) | |
912 | log_debug("Ignoring invalid message: %s", strerror(-r)); | |
913 | else | |
914 | return r; | |
915 | } | |
916 | } else { | |
917 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
918 | close_kdbus_msg(bus, k); | |
919 | } | |
cb67f718 | 920 | } |
069f5e61 LP |
921 | |
922 | return 1; | |
cb67f718 | 923 | } |
69aec65c | 924 | |
cb67f718 DM |
925 | static int push_name_owner_changed(sd_bus *bus, const char *name, const char *old_owner, const char *new_owner) { |
926 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; | |
927 | int r; | |
2dc9970b | 928 | |
cb67f718 | 929 | assert(bus); |
2dc9970b | 930 | |
cb67f718 DM |
931 | r = sd_bus_message_new_signal( |
932 | bus, | |
151b9b96 | 933 | &m, |
cb67f718 DM |
934 | "/org/freedesktop/DBus", |
935 | "org.freedesktop.DBus", | |
151b9b96 | 936 | "NameOwnerChanged"); |
cb67f718 DM |
937 | if (r < 0) |
938 | return r; | |
2dc9970b | 939 | |
cb67f718 DM |
940 | r = sd_bus_message_append(m, "sss", name, old_owner, new_owner); |
941 | if (r < 0) | |
942 | return r; | |
5b12334d | 943 | |
cb67f718 | 944 | m->sender = "org.freedesktop.DBus"; |
5b12334d | 945 | |
cb67f718 DM |
946 | r = bus_seal_synthetic_message(bus, m); |
947 | if (r < 0) | |
948 | return r; | |
5b12334d | 949 | |
cb67f718 DM |
950 | bus->rqueue[bus->rqueue_size++] = m; |
951 | m = NULL; | |
5b12334d | 952 | |
cb67f718 DM |
953 | return 1; |
954 | } | |
5b12334d | 955 | |
cb67f718 DM |
956 | static int translate_name_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { |
957 | char new_owner[UNIQUE_NAME_MAX], old_owner[UNIQUE_NAME_MAX]; | |
5b12334d | 958 | |
cb67f718 DM |
959 | assert(bus); |
960 | assert(k); | |
961 | assert(d); | |
751bc6ac | 962 | |
619d7a03 | 963 | if (d->type == KDBUS_ITEM_NAME_ADD || (d->name_change.old_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) |
cb67f718 DM |
964 | old_owner[0] = 0; |
965 | else | |
619d7a03 | 966 | sprintf(old_owner, ":1.%llu", (unsigned long long) d->name_change.old_id.id); |
751bc6ac | 967 | |
619d7a03 | 968 | if (d->type == KDBUS_ITEM_NAME_REMOVE || (d->name_change.new_id.flags & (KDBUS_NAME_IN_QUEUE|KDBUS_NAME_ACTIVATOR))) { |
751bc6ac | 969 | |
cb67f718 DM |
970 | if (isempty(old_owner)) |
971 | return 0; | |
5b12334d | 972 | |
cb67f718 DM |
973 | new_owner[0] = 0; |
974 | } else | |
619d7a03 | 975 | sprintf(new_owner, ":1.%llu", (unsigned long long) d->name_change.new_id.id); |
5b12334d | 976 | |
cb67f718 DM |
977 | return push_name_owner_changed(bus, d->name_change.name, old_owner, new_owner); |
978 | } | |
5b12334d | 979 | |
cb67f718 DM |
980 | static int translate_id_change(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { |
981 | char owner[UNIQUE_NAME_MAX]; | |
2e2ec0ea | 982 | |
cb67f718 DM |
983 | assert(bus); |
984 | assert(k); | |
985 | assert(d); | |
777d7a61 | 986 | |
cb67f718 | 987 | sprintf(owner, ":1.%llu", d->id_change.id); |
2e2ec0ea | 988 | |
cb67f718 DM |
989 | return push_name_owner_changed( |
990 | bus, owner, | |
991 | d->type == KDBUS_ITEM_ID_ADD ? NULL : owner, | |
992 | d->type == KDBUS_ITEM_ID_ADD ? owner : NULL); | |
993 | } | |
49b832c5 | 994 | |
cb67f718 DM |
995 | static int translate_reply(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) { |
996 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; | |
997 | int r; | |
777d7a61 | 998 | |
cb67f718 DM |
999 | assert(bus); |
1000 | assert(k); | |
1001 | assert(d); | |
acb5a3cb | 1002 | |
cb67f718 DM |
1003 | r = bus_message_new_synthetic_error( |
1004 | bus, | |
1005 | k->cookie_reply, | |
1006 | d->type == KDBUS_ITEM_REPLY_TIMEOUT ? | |
1007 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call timed out") : | |
1008 | &SD_BUS_ERROR_MAKE_CONST(SD_BUS_ERROR_NO_REPLY, "Method call peer died"), | |
1009 | &m); | |
1307c3ff | 1010 | if (r < 0) |
cb67f718 | 1011 | return r; |
51038c03 | 1012 | |
cb67f718 | 1013 | m->sender = "org.freedesktop.DBus"; |
51038c03 | 1014 | |
cb67f718 DM |
1015 | r = bus_seal_synthetic_message(bus, m); |
1016 | if (r < 0) | |
1017 | return r; | |
6629161f | 1018 | |
7adc46fc | 1019 | bus->rqueue[bus->rqueue_size++] = m; |
cb67f718 | 1020 | m = NULL; |
7d22c717 | 1021 | |
6629161f | 1022 | return 1; |
cb67f718 | 1023 | } |
1307c3ff | 1024 | |
cb67f718 DM |
1025 | static int bus_kernel_translate_message(sd_bus *bus, struct kdbus_msg *k) { |
1026 | struct kdbus_item *d, *found = NULL; | |
1307c3ff | 1027 | |
cb67f718 DM |
1028 | static int (* const translate[])(sd_bus *bus, struct kdbus_msg *k, struct kdbus_item *d) = { |
1029 | [KDBUS_ITEM_NAME_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1030 | [KDBUS_ITEM_NAME_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1031 | [KDBUS_ITEM_NAME_CHANGE - _KDBUS_ITEM_KERNEL_BASE] = translate_name_change, | |
1307c3ff | 1032 | |
cb67f718 DM |
1033 | [KDBUS_ITEM_ID_ADD - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, |
1034 | [KDBUS_ITEM_ID_REMOVE - _KDBUS_ITEM_KERNEL_BASE] = translate_id_change, | |
1035 | ||
1036 | [KDBUS_ITEM_REPLY_TIMEOUT - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1037 | [KDBUS_ITEM_REPLY_DEAD - _KDBUS_ITEM_KERNEL_BASE] = translate_reply, | |
1038 | }; | |
1039 | ||
1040 | assert(bus); | |
1041 | assert(k); | |
1042 | assert(k->payload_type == KDBUS_PAYLOAD_KERNEL); | |
1043 | ||
1044 | KDBUS_ITEM_FOREACH(d, k, items) { | |
1045 | if (d->type >= _KDBUS_ITEM_KERNEL_BASE && d->type < _KDBUS_ITEM_KERNEL_BASE + ELEMENTSOF(translate)) { | |
1046 | if (found) | |
1047 | return -EBADMSG; | |
1048 | found = d; | |
1049 | } else | |
1050 | log_debug("Got unknown field from kernel %llu", d->type); | |
1307c3ff LP |
1051 | } |
1052 | ||
cb67f718 DM |
1053 | if (!found) { |
1054 | log_debug("Didn't find a kernel message to translate."); | |
1055 | return 0; | |
1056 | } | |
1057 | ||
1058 | return translate[found->type - _KDBUS_ITEM_KERNEL_BASE](bus, k, found); | |
6629161f LP |
1059 | } |
1060 | ||
766c5809 | 1061 | int bus_kernel_read_message(sd_bus *bus, bool hint_priority, int64_t priority) { |
9ff1897b | 1062 | struct kdbus_cmd_recv recv = {}; |
6629161f | 1063 | struct kdbus_msg *k; |
6629161f LP |
1064 | int r; |
1065 | ||
1066 | assert(bus); | |
7d22c717 | 1067 | |
7adc46fc | 1068 | r = bus_rqueue_make_room(bus); |
7d22c717 LP |
1069 | if (r < 0) |
1070 | return r; | |
6629161f | 1071 | |
766c5809 LP |
1072 | if (hint_priority) { |
1073 | recv.flags |= KDBUS_RECV_USE_PRIORITY; | |
1074 | recv.priority = priority; | |
1075 | } | |
1076 | ||
9ff1897b | 1077 | r = ioctl(bus->input_fd, KDBUS_CMD_MSG_RECV, &recv); |
fd8d62d9 | 1078 | if (r < 0) { |
6629161f LP |
1079 | if (errno == EAGAIN) |
1080 | return 0; | |
1081 | ||
fd8d62d9 | 1082 | return -errno; |
6629161f LP |
1083 | } |
1084 | ||
069f5e61 | 1085 | k = (struct kdbus_msg *)((uint8_t *)bus->kdbus_buffer + recv.offset); |
e1d337d4 | 1086 | if (k->payload_type == KDBUS_PAYLOAD_DBUS) { |
7d22c717 | 1087 | r = bus_kernel_make_message(bus, k); |
e1d337d4 LP |
1088 | |
1089 | /* Anybody can send us invalid messages, let's just drop them. */ | |
1090 | if (r == -EBADMSG || r == -EPROTOTYPE) { | |
ff4994c5 | 1091 | log_debug("Ignoring invalid message: %s", strerror(-r)); |
e1d337d4 LP |
1092 | r = 0; |
1093 | } | |
1094 | ||
1095 | } else if (k->payload_type == KDBUS_PAYLOAD_KERNEL) | |
7d22c717 | 1096 | r = bus_kernel_translate_message(bus, k); |
069f5e61 LP |
1097 | else { |
1098 | log_debug("Ignoring message with unknown payload type %llu.", (unsigned long long) k->payload_type); | |
777d7a61 | 1099 | r = 0; |
069f5e61 | 1100 | } |
777d7a61 | 1101 | |
fd8d62d9 LP |
1102 | if (r <= 0) |
1103 | close_kdbus_msg(bus, k); | |
6629161f | 1104 | |
51038c03 | 1105 | return r < 0 ? r : 1; |
6629161f LP |
1106 | } |
1107 | ||
8e959fbf | 1108 | int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *mapped, size_t *allocated) { |
bc7fd8cd | 1109 | struct memfd_cache *c; |
45fbe937 | 1110 | int fd; |
bc7fd8cd LP |
1111 | |
1112 | assert(address); | |
8e959fbf LP |
1113 | assert(mapped); |
1114 | assert(allocated); | |
35460afc LP |
1115 | |
1116 | if (!bus || !bus->is_kernel) | |
1117 | return -ENOTSUP; | |
bc7fd8cd | 1118 | |
76b7742c | 1119 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
45fbe937 | 1120 | |
bc7fd8cd | 1121 | if (bus->n_memfd_cache <= 0) { |
8d1db1d1 | 1122 | _cleanup_free_ char *g = NULL; |
45fbe937 LP |
1123 | int r; |
1124 | ||
76b7742c | 1125 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1126 | |
8d1db1d1 LP |
1127 | assert(bus->connection_name); |
1128 | ||
a6278b88 | 1129 | g = bus_label_escape(bus->connection_name); |
8d1db1d1 LP |
1130 | if (!g) |
1131 | return -ENOMEM; | |
1132 | ||
46327770 | 1133 | r = memfd_create(g, MFD_ALLOW_SEALING); |
9b05bc48 | 1134 | if (r < 0) |
bc7fd8cd LP |
1135 | return -errno; |
1136 | ||
1137 | *address = NULL; | |
8e959fbf LP |
1138 | *mapped = 0; |
1139 | *allocated = 0; | |
a6082d77 | 1140 | return r; |
bc7fd8cd LP |
1141 | } |
1142 | ||
bf30e48f | 1143 | c = &bus->memfd_cache[--bus->n_memfd_cache]; |
bc7fd8cd LP |
1144 | |
1145 | assert(c->fd >= 0); | |
8e959fbf | 1146 | assert(c->mapped == 0 || c->address); |
bc7fd8cd LP |
1147 | |
1148 | *address = c->address; | |
8e959fbf LP |
1149 | *mapped = c->mapped; |
1150 | *allocated = c->allocated; | |
45fbe937 LP |
1151 | fd = c->fd; |
1152 | ||
76b7742c | 1153 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1154 | |
45fbe937 LP |
1155 | return fd; |
1156 | } | |
1157 | ||
1158 | static void close_and_munmap(int fd, void *address, size_t size) { | |
1159 | if (size > 0) | |
76b7742c | 1160 | assert_se(munmap(address, PAGE_ALIGN(size)) >= 0); |
45fbe937 | 1161 | |
03e334a1 | 1162 | safe_close(fd); |
bc7fd8cd LP |
1163 | } |
1164 | ||
8e959fbf | 1165 | void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) { |
bc7fd8cd | 1166 | struct memfd_cache *c; |
8e959fbf | 1167 | uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX); |
bc7fd8cd LP |
1168 | |
1169 | assert(fd >= 0); | |
8e959fbf | 1170 | assert(mapped == 0 || address); |
bc7fd8cd | 1171 | |
45fbe937 | 1172 | if (!bus || !bus->is_kernel) { |
8e959fbf | 1173 | close_and_munmap(fd, address, mapped); |
45fbe937 LP |
1174 | return; |
1175 | } | |
1176 | ||
76b7742c | 1177 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1178 | |
45fbe937 | 1179 | if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) { |
76b7742c | 1180 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1181 | |
8e959fbf | 1182 | close_and_munmap(fd, address, mapped); |
bc7fd8cd LP |
1183 | return; |
1184 | } | |
1185 | ||
1186 | c = &bus->memfd_cache[bus->n_memfd_cache++]; | |
1187 | c->fd = fd; | |
1188 | c->address = address; | |
1189 | ||
1190 | /* If overly long, let's return a bit to the OS */ | |
8e959fbf | 1191 | if (mapped > max_mapped) { |
a6082d77 | 1192 | assert_se(ftruncate(fd, max_mapped) >= 0); |
8e959fbf LP |
1193 | assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0); |
1194 | c->mapped = c->allocated = max_mapped; | |
1195 | } else { | |
1196 | c->mapped = mapped; | |
1197 | c->allocated = allocated; | |
1198 | } | |
45fbe937 | 1199 | |
76b7742c | 1200 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd LP |
1201 | } |
1202 | ||
1203 | void bus_kernel_flush_memfd(sd_bus *b) { | |
1204 | unsigned i; | |
1205 | ||
1206 | assert(b); | |
1207 | ||
76b7742c | 1208 | for (i = 0; i < b->n_memfd_cache; i++) |
8e959fbf | 1209 | close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped); |
bc7fd8cd | 1210 | } |
0253ddcc | 1211 | |
e3dd987c LP |
1212 | int kdbus_translate_request_name_flags(uint64_t flags, uint64_t *kdbus_flags) { |
1213 | uint64_t f = 0; | |
0253ddcc | 1214 | |
e3dd987c | 1215 | assert(kdbus_flags); |
0253ddcc | 1216 | |
e3dd987c LP |
1217 | if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT) |
1218 | f |= KDBUS_NAME_ALLOW_REPLACEMENT; | |
0253ddcc | 1219 | |
e3dd987c LP |
1220 | if (flags & SD_BUS_NAME_REPLACE_EXISTING) |
1221 | f |= KDBUS_NAME_REPLACE_EXISTING; | |
0253ddcc | 1222 | |
d90bb669 | 1223 | if (flags & SD_BUS_NAME_QUEUE) |
e3dd987c | 1224 | f |= KDBUS_NAME_QUEUE; |
0253ddcc | 1225 | |
e3dd987c LP |
1226 | *kdbus_flags = f; |
1227 | return 0; | |
1228 | } | |
1229 | ||
1230 | int kdbus_translate_attach_flags(uint64_t mask, uint64_t *kdbus_mask) { | |
1231 | uint64_t m = 0; | |
1232 | ||
1233 | assert(kdbus_mask); | |
1234 | ||
1235 | if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID)) | |
1236 | m |= KDBUS_ATTACH_CREDS; | |
1237 | ||
1238 | if (mask & (SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM)) | |
1239 | m |= KDBUS_ATTACH_COMM; | |
1240 | ||
1241 | if (mask & SD_BUS_CREDS_EXE) | |
1242 | m |= KDBUS_ATTACH_EXE; | |
1243 | ||
1244 | if (mask & SD_BUS_CREDS_CMDLINE) | |
1245 | m |= KDBUS_ATTACH_CMDLINE; | |
1246 | ||
1247 | 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)) | |
1248 | m |= KDBUS_ATTACH_CGROUP; | |
1249 | ||
1250 | if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) | |
1251 | m |= KDBUS_ATTACH_CAPS; | |
1252 | ||
1253 | if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) | |
1254 | m |= KDBUS_ATTACH_SECLABEL; | |
0253ddcc | 1255 | |
e3dd987c LP |
1256 | if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) |
1257 | m |= KDBUS_ATTACH_AUDIT; | |
1258 | ||
49b832c5 LP |
1259 | if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) |
1260 | m |= KDBUS_ATTACH_NAMES; | |
1261 | ||
cccb0b2c LP |
1262 | if (mask & SD_BUS_CREDS_CONNECTION_NAME) |
1263 | m |= KDBUS_ATTACH_CONN_NAME; | |
1264 | ||
e3dd987c | 1265 | *kdbus_mask = m; |
0253ddcc DM |
1266 | return 0; |
1267 | } | |
e3dd987c | 1268 | |
f2769777 | 1269 | int bus_kernel_create_bus(const char *name, bool world, char **s) { |
816a3f9e | 1270 | struct kdbus_cmd_make *make; |
e3dd987c LP |
1271 | struct kdbus_item *n; |
1272 | int fd; | |
1273 | ||
1274 | assert(name); | |
1275 | assert(s); | |
1276 | ||
1277 | fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1278 | if (fd < 0) | |
1279 | return -errno; | |
1280 | ||
7f3d3ba1 DH |
1281 | make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd_make, items) + |
1282 | offsetof(struct kdbus_item, data64) + sizeof(uint64_t) + | |
1283 | offsetof(struct kdbus_item, str) + | |
1284 | DECIMAL_STR_MAX(uid_t) + 1 + strlen(name) + 1), | |
1285 | 8); | |
e3dd987c | 1286 | |
816a3f9e DM |
1287 | make->size = offsetof(struct kdbus_cmd_make, items); |
1288 | ||
e3dd987c | 1289 | n = make->items; |
18a28147 KS |
1290 | n->size = offsetof(struct kdbus_item, bloom_parameter) + |
1291 | sizeof(struct kdbus_bloom_parameter); | |
1292 | n->type = KDBUS_ITEM_BLOOM_PARAMETER; | |
b28ff39f LP |
1293 | |
1294 | n->bloom_parameter.size = DEFAULT_BLOOM_SIZE; | |
1295 | n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH; | |
1296 | ||
1297 | assert_cc(DEFAULT_BLOOM_SIZE > 0); | |
1298 | assert_cc(DEFAULT_BLOOM_N_HASH > 0); | |
1299 | ||
816a3f9e DM |
1300 | make->size += ALIGN8(n->size); |
1301 | ||
1302 | n = KDBUS_ITEM_NEXT(n); | |
a4152e3f | 1303 | sprintf(n->str, UID_FMT "-%s", getuid(), name); |
e3dd987c | 1304 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; |
5e16c257 | 1305 | n->type = KDBUS_ITEM_MAKE_NAME; |
816a3f9e | 1306 | make->size += ALIGN8(n->size); |
e3dd987c | 1307 | |
f7c7cd03 | 1308 | make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0; |
e3dd987c LP |
1309 | |
1310 | if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { | |
03e334a1 | 1311 | safe_close(fd); |
e3dd987c LP |
1312 | return -errno; |
1313 | } | |
1314 | ||
1315 | if (s) { | |
1316 | char *p; | |
1317 | ||
1318 | p = strjoin("/dev/kdbus/", n->str, "/bus", NULL); | |
1319 | if (!p) { | |
03e334a1 | 1320 | safe_close(fd); |
e3dd987c LP |
1321 | return -ENOMEM; |
1322 | } | |
1323 | ||
1324 | *s = p; | |
1325 | } | |
1326 | ||
1327 | return fd; | |
1328 | } | |
9bd37b40 | 1329 | |
5369c77d | 1330 | static int bus_kernel_translate_access(BusPolicyAccess access) { |
a4152e3f | 1331 | assert(access >= 0); |
5369c77d | 1332 | assert(access < _BUS_POLICY_ACCESS_MAX); |
a4152e3f LP |
1333 | |
1334 | switch (access) { | |
1335 | ||
5369c77d | 1336 | case BUS_POLICY_ACCESS_SEE: |
a4152e3f LP |
1337 | return KDBUS_POLICY_SEE; |
1338 | ||
5369c77d | 1339 | case BUS_POLICY_ACCESS_TALK: |
a4152e3f LP |
1340 | return KDBUS_POLICY_TALK; |
1341 | ||
5369c77d | 1342 | case BUS_POLICY_ACCESS_OWN: |
a4152e3f LP |
1343 | return KDBUS_POLICY_OWN; |
1344 | ||
1345 | default: | |
1346 | assert_not_reached("Unknown policy access"); | |
1347 | } | |
1348 | } | |
1349 | ||
1350 | static int bus_kernel_translate_policy(const BusNamePolicy *policy, struct kdbus_item *item) { | |
1351 | int r; | |
09365592 LP |
1352 | |
1353 | assert(policy); | |
1354 | assert(item); | |
1355 | ||
1683342a | 1356 | switch (policy->type) { |
09365592 | 1357 | |
a4152e3f LP |
1358 | case BUSNAME_POLICY_TYPE_USER: { |
1359 | const char *user = policy->name; | |
1360 | uid_t uid; | |
1361 | ||
1362 | r = get_user_creds(&user, &uid, NULL, NULL, NULL); | |
1363 | if (r < 0) | |
1364 | return r; | |
1365 | ||
1683342a | 1366 | item->policy_access.type = KDBUS_POLICY_ACCESS_USER; |
a4152e3f | 1367 | item->policy_access.id = uid; |
1683342a | 1368 | break; |
a4152e3f | 1369 | } |
1683342a | 1370 | |
a4152e3f LP |
1371 | case BUSNAME_POLICY_TYPE_GROUP: { |
1372 | const char *group = policy->name; | |
1373 | gid_t gid; | |
1683342a | 1374 | |
a4152e3f LP |
1375 | r = get_group_creds(&group, &gid); |
1376 | if (r < 0) | |
1377 | return r; | |
1378 | ||
1379 | item->policy_access.type = KDBUS_POLICY_ACCESS_GROUP; | |
1380 | item->policy_access.id = gid; | |
1683342a | 1381 | break; |
a4152e3f | 1382 | } |
1683342a DM |
1383 | |
1384 | default: | |
1385 | assert_not_reached("Unknown policy type"); | |
1386 | } | |
1387 | ||
a4152e3f | 1388 | item->policy_access.access = bus_kernel_translate_access(policy->access); |
09365592 | 1389 | |
a4152e3f LP |
1390 | return 0; |
1391 | } | |
1683342a | 1392 | |
8f077bf9 | 1393 | int bus_kernel_open_bus_fd(const char *bus, char **path) { |
a4152e3f LP |
1394 | char *p; |
1395 | int fd; | |
8f077bf9 | 1396 | size_t len; |
1683342a | 1397 | |
8f077bf9 ZJS |
1398 | len = strlen("/dev/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1; |
1399 | ||
1400 | if (path) { | |
1401 | p = malloc(len); | |
1402 | if (!p) | |
1403 | return -ENOMEM; | |
1404 | *path = p; | |
1405 | } else | |
1406 | p = alloca(len); | |
a4152e3f | 1407 | sprintf(p, "/dev/kdbus/" UID_FMT "-%s/bus", getuid(), bus); |
1683342a | 1408 | |
a4152e3f LP |
1409 | fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); |
1410 | if (fd < 0) | |
1411 | return -errno; | |
1412 | ||
1413 | return fd; | |
1683342a DM |
1414 | } |
1415 | ||
e7d718af | 1416 | int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) { |
8e00bfc2 | 1417 | _cleanup_free_ char *path = NULL; |
e7d718af DM |
1418 | struct kdbus_cmd_make *make; |
1419 | struct kdbus_item *n; | |
1420 | size_t size; | |
1421 | int fd; | |
1422 | ||
1423 | fd = bus_kernel_open_bus_fd(bus_name, &path); | |
1424 | if (fd < 0) | |
1425 | return fd; | |
1426 | ||
1427 | size = ALIGN8(offsetof(struct kdbus_cmd_make, items)); | |
1428 | size += ALIGN8(offsetof(struct kdbus_item, str) + strlen(ep_name) + 1); | |
1429 | ||
7f3d3ba1 | 1430 | make = alloca0_align(size, 8); |
e7d718af DM |
1431 | make->size = size; |
1432 | make->flags = KDBUS_MAKE_ACCESS_WORLD; | |
1433 | ||
1434 | n = make->items; | |
1435 | ||
1436 | n->type = KDBUS_ITEM_MAKE_NAME; | |
1437 | n->size = offsetof(struct kdbus_item, str) + strlen(ep_name) + 1; | |
1438 | strcpy(n->str, ep_name); | |
1439 | ||
40885bb2 | 1440 | if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) { |
e7d718af DM |
1441 | safe_close(fd); |
1442 | return -errno; | |
1443 | } | |
1444 | ||
e7d718af | 1445 | if (ep_path) { |
2c652b6b LP |
1446 | char *p; |
1447 | ||
1448 | p = strjoin(dirname(path), "/", ep_name, NULL); | |
1449 | if (!p) { | |
4edf33d1 | 1450 | safe_close(fd); |
e7d718af | 1451 | return -ENOMEM; |
4edf33d1 | 1452 | } |
2c652b6b LP |
1453 | |
1454 | *ep_path = p; | |
e7d718af DM |
1455 | } |
1456 | ||
1457 | return fd; | |
1458 | } | |
1459 | ||
1460 | int bus_kernel_set_endpoint_policy(int fd, uid_t uid, BusEndpoint *ep) { | |
1461 | ||
1462 | struct kdbus_cmd_update *update; | |
1463 | struct kdbus_item *n; | |
1464 | BusEndpointPolicy *po; | |
1465 | Iterator i; | |
1466 | size_t size; | |
1467 | int r; | |
1468 | ||
1469 | size = ALIGN8(offsetof(struct kdbus_cmd_update, items)); | |
1470 | ||
1471 | HASHMAP_FOREACH(po, ep->policy_hash, i) { | |
1472 | size += ALIGN8(offsetof(struct kdbus_item, str) + strlen(po->name) + 1); | |
1473 | size += ALIGN8(offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access)); | |
1474 | } | |
1475 | ||
7f3d3ba1 | 1476 | update = alloca0_align(size, 8); |
e7d718af DM |
1477 | update->size = size; |
1478 | ||
1479 | n = update->items; | |
1480 | ||
1481 | HASHMAP_FOREACH(po, ep->policy_hash, i) { | |
1482 | n->type = KDBUS_ITEM_NAME; | |
1483 | n->size = offsetof(struct kdbus_item, str) + strlen(po->name) + 1; | |
1484 | strcpy(n->str, po->name); | |
1485 | n = KDBUS_ITEM_NEXT(n); | |
1486 | ||
1487 | n->type = KDBUS_ITEM_POLICY_ACCESS; | |
1488 | n->size = offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access); | |
1489 | ||
1490 | n->policy_access.type = KDBUS_POLICY_ACCESS_USER; | |
1491 | n->policy_access.access = bus_kernel_translate_access(po->access); | |
1492 | n->policy_access.id = uid; | |
1493 | ||
1494 | n = KDBUS_ITEM_NEXT(n); | |
1495 | } | |
1496 | ||
40885bb2 | 1497 | r = ioctl(fd, KDBUS_CMD_ENDPOINT_UPDATE, update); |
e7d718af DM |
1498 | if (r < 0) |
1499 | return -errno; | |
1500 | ||
1501 | return 0; | |
1502 | } | |
1503 | ||
a4152e3f LP |
1504 | int bus_kernel_make_starter( |
1505 | int fd, | |
1506 | const char *name, | |
1507 | bool activating, | |
1508 | bool accept_fd, | |
1509 | BusNamePolicy *policy, | |
5369c77d | 1510 | BusPolicyAccess world_policy) { |
a4152e3f | 1511 | |
e821075a LP |
1512 | struct kdbus_cmd_hello *hello; |
1513 | struct kdbus_item *n; | |
1683342a DM |
1514 | size_t policy_cnt = 0; |
1515 | BusNamePolicy *po; | |
1516 | size_t size; | |
a4152e3f | 1517 | int r; |
e821075a | 1518 | |
a4152e3f | 1519 | assert(fd >= 0); |
e821075a LP |
1520 | assert(name); |
1521 | ||
1683342a DM |
1522 | LIST_FOREACH(policy, po, policy) |
1523 | policy_cnt++; | |
1524 | ||
a4152e3f LP |
1525 | if (world_policy >= 0) |
1526 | policy_cnt++; | |
1527 | ||
1683342a DM |
1528 | size = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) + |
1529 | ALIGN8(offsetof(struct kdbus_item, str) + strlen(name) + 1) + | |
1530 | policy_cnt * ALIGN8(offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access)); | |
1531 | ||
7f3d3ba1 | 1532 | hello = alloca0_align(size, 8); |
e821075a LP |
1533 | |
1534 | n = hello->items; | |
1535 | strcpy(n->str, name); | |
1536 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
613ec4b8 | 1537 | n->type = KDBUS_ITEM_NAME; |
1683342a DM |
1538 | n = KDBUS_ITEM_NEXT(n); |
1539 | ||
1540 | LIST_FOREACH(policy, po, policy) { | |
1541 | n->type = KDBUS_ITEM_POLICY_ACCESS; | |
1542 | n->size = offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access); | |
a4152e3f LP |
1543 | |
1544 | r = bus_kernel_translate_policy(po, n); | |
1545 | if (r < 0) | |
1546 | return r; | |
1547 | ||
1683342a DM |
1548 | n = KDBUS_ITEM_NEXT(n); |
1549 | } | |
e821075a | 1550 | |
a4152e3f LP |
1551 | if (world_policy >= 0) { |
1552 | n->type = KDBUS_ITEM_POLICY_ACCESS; | |
1553 | n->size = offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access); | |
1554 | n->policy_access.type = KDBUS_POLICY_ACCESS_WORLD; | |
1555 | n->policy_access.access = bus_kernel_translate_access(world_policy); | |
1556 | } | |
1557 | ||
1683342a | 1558 | hello->size = size; |
5892a914 DM |
1559 | hello->conn_flags = |
1560 | (activating ? KDBUS_HELLO_ACTIVATOR : KDBUS_HELLO_POLICY_HOLDER) | | |
1561 | (accept_fd ? KDBUS_HELLO_ACCEPT_FD : 0); | |
e821075a | 1562 | hello->pool_size = KDBUS_POOL_SIZE; |
d2e7b05f | 1563 | hello->attach_flags = _KDBUS_ATTACH_ALL; |
e821075a | 1564 | |
a4152e3f | 1565 | if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) |
e821075a | 1566 | return -errno; |
e821075a | 1567 | |
4a3e79e1 | 1568 | /* The higher 32bit of the bus_flags fields are considered |
e821075a | 1569 | * 'incompatible flags'. Refuse them all for now. */ |
4a3e79e1 | 1570 | if (hello->bus_flags > 0xFFFFFFFFULL) |
e821075a | 1571 | return -ENOTSUP; |
e821075a | 1572 | |
a4152e3f | 1573 | if (!bloom_validate_parameters((size_t) hello->bloom.size, (unsigned) hello->bloom.n_hash)) |
e821075a | 1574 | return -ENOTSUP; |
e821075a LP |
1575 | |
1576 | return fd; | |
1577 | } | |
1578 | ||
486e99a3 | 1579 | int bus_kernel_create_domain(const char *name, char **s) { |
816a3f9e | 1580 | struct kdbus_cmd_make *make; |
9bd37b40 LP |
1581 | struct kdbus_item *n; |
1582 | int fd; | |
1583 | ||
1584 | assert(name); | |
1585 | assert(s); | |
1586 | ||
1587 | fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1588 | if (fd < 0) | |
1589 | return -errno; | |
1590 | ||
7f3d3ba1 DH |
1591 | make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd_make, items) + |
1592 | offsetof(struct kdbus_item, str) + | |
1593 | strlen(name) + 1), | |
1594 | 8); | |
9bd37b40 LP |
1595 | |
1596 | n = make->items; | |
1597 | strcpy(n->str, name); | |
1598 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
5e16c257 | 1599 | n->type = KDBUS_ITEM_MAKE_NAME; |
9bd37b40 | 1600 | |
816a3f9e | 1601 | make->size = ALIGN8(offsetof(struct kdbus_cmd_make, items) + n->size); |
f7c7cd03 | 1602 | make->flags = KDBUS_MAKE_ACCESS_WORLD; |
9bd37b40 | 1603 | |
486e99a3 | 1604 | if (ioctl(fd, KDBUS_CMD_DOMAIN_MAKE, make) < 0) { |
03e334a1 | 1605 | safe_close(fd); |
9bd37b40 LP |
1606 | return -errno; |
1607 | } | |
1608 | ||
f9638db8 LP |
1609 | /* The higher 32bit of the flags field are considered |
1610 | * 'incompatible flags'. Refuse them all for now. */ | |
1611 | if (make->flags > 0xFFFFFFFFULL) { | |
03e334a1 | 1612 | safe_close(fd); |
f9638db8 LP |
1613 | return -ENOTSUP; |
1614 | } | |
1615 | ||
9bd37b40 LP |
1616 | if (s) { |
1617 | char *p; | |
1618 | ||
486e99a3 | 1619 | p = strappend("/dev/kdbus/domain/", name); |
9bd37b40 | 1620 | if (!p) { |
03e334a1 | 1621 | safe_close(fd); |
9bd37b40 LP |
1622 | return -ENOMEM; |
1623 | } | |
1624 | ||
1625 | *s = p; | |
1626 | } | |
1627 | ||
1628 | return fd; | |
1629 | } | |
c8fa3f60 | 1630 | |
ae095f86 LP |
1631 | int bus_kernel_try_close(sd_bus *bus) { |
1632 | assert(bus); | |
1633 | assert(bus->is_kernel); | |
1634 | ||
1635 | if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE) < 0) | |
1636 | return -errno; | |
1637 | ||
1638 | return 0; | |
1639 | } | |
ff975efb LP |
1640 | |
1641 | int bus_kernel_drop_one(int fd) { | |
1642 | struct kdbus_cmd_recv recv = { | |
1643 | .flags = KDBUS_RECV_DROP | |
1644 | }; | |
1645 | ||
1646 | assert(fd >= 0); | |
1647 | ||
1648 | if (ioctl(fd, KDBUS_CMD_MSG_RECV, &recv) < 0) | |
1649 | return -errno; | |
1650 | ||
1651 | return 0; | |
1652 | } |