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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" |
6bcf0cf6 | 34 | #include "memfd-util.h" |
6629161f LP |
35 | |
36 | #include "bus-internal.h" | |
37 | #include "bus-message.h" | |
38 | #include "bus-kernel.h" | |
a56f19c4 | 39 | #include "bus-bloom.h" |
777d7a61 | 40 | #include "bus-util.h" |
a6278b88 | 41 | #include "bus-label.h" |
751bc6ac | 42 | #include "cgroup-util.h" |
777d7a61 LP |
43 | |
44 | #define UNIQUE_NAME_MAX (3+DECIMAL_STR_MAX(uint64_t)) | |
6629161f | 45 | |
c7819669 | 46 | int bus_kernel_parse_unique_name(const char *s, uint64_t *id) { |
6629161f LP |
47 | int r; |
48 | ||
49 | assert(s); | |
50 | assert(id); | |
51 | ||
52 | if (!startswith(s, ":1.")) | |
53 | return 0; | |
54 | ||
55 | r = safe_atou64(s + 3, id); | |
56 | if (r < 0) | |
57 | return r; | |
58 | ||
59 | return 1; | |
60 | } | |
61 | ||
febfd508 | 62 | static void append_payload_vec(struct kdbus_item **d, const void *p, size_t sz) { |
6629161f | 63 | assert(d); |
6629161f LP |
64 | assert(sz > 0); |
65 | ||
e86b80b8 LP |
66 | *d = ALIGN8_PTR(*d); |
67 | ||
66b26c5c LP |
68 | /* Note that p can be NULL, which encodes a region full of |
69 | * zeroes, which is useful to optimize certain padding | |
70 | * conditions */ | |
71 | ||
febfd508 | 72 | (*d)->size = offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec); |
ea1edece | 73 | (*d)->type = KDBUS_ITEM_PAYLOAD_VEC; |
a392d361 | 74 | (*d)->vec.address = PTR_TO_UINT64(p); |
6629161f LP |
75 | (*d)->vec.size = sz; |
76 | ||
febfd508 | 77 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
78 | } |
79 | ||
a392d361 LP |
80 | static void append_payload_memfd(struct kdbus_item **d, int memfd, size_t sz) { |
81 | assert(d); | |
82 | assert(memfd >= 0); | |
83 | assert(sz > 0); | |
84 | ||
85 | *d = ALIGN8_PTR(*d); | |
86 | (*d)->size = offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd); | |
ea1edece | 87 | (*d)->type = KDBUS_ITEM_PAYLOAD_MEMFD; |
a392d361 LP |
88 | (*d)->memfd.fd = memfd; |
89 | (*d)->memfd.size = sz; | |
90 | ||
91 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); | |
92 | } | |
93 | ||
febfd508 | 94 | static void append_destination(struct kdbus_item **d, const char *s, size_t length) { |
6629161f | 95 | assert(d); |
b5baa8fe | 96 | assert(s); |
6629161f | 97 | |
e86b80b8 LP |
98 | *d = ALIGN8_PTR(*d); |
99 | ||
febfd508 | 100 | (*d)->size = offsetof(struct kdbus_item, str) + length + 1; |
ea1edece | 101 | (*d)->type = KDBUS_ITEM_DST_NAME; |
51038c03 | 102 | memcpy((*d)->str, s, length + 1); |
6629161f | 103 | |
febfd508 | 104 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
6629161f LP |
105 | } |
106 | ||
18a28147 KS |
107 | static struct kdbus_bloom_filter *append_bloom(struct kdbus_item **d, size_t length) { |
108 | struct kdbus_item *i; | |
a56f19c4 | 109 | |
b5baa8fe | 110 | assert(d); |
b5baa8fe | 111 | |
18a28147 | 112 | i = ALIGN8_PTR(*d); |
b5baa8fe | 113 | |
18a28147 KS |
114 | i->size = offsetof(struct kdbus_item, bloom_filter) + |
115 | offsetof(struct kdbus_bloom_filter, data) + | |
116 | length; | |
117 | i->type = KDBUS_ITEM_BLOOM_FILTER; | |
b5baa8fe | 118 | |
18a28147 | 119 | *d = (struct kdbus_item *) ((uint8_t*) i + i->size); |
a56f19c4 | 120 | |
18a28147 | 121 | return &i->bloom_filter; |
a56f19c4 LP |
122 | } |
123 | ||
febfd508 | 124 | static void append_fds(struct kdbus_item **d, const int fds[], unsigned n_fds) { |
9097fe29 LP |
125 | assert(d); |
126 | assert(fds); | |
127 | assert(n_fds > 0); | |
128 | ||
129 | *d = ALIGN8_PTR(*d); | |
febfd508 | 130 | (*d)->size = offsetof(struct kdbus_item, fds) + sizeof(int) * n_fds; |
ea1edece | 131 | (*d)->type = KDBUS_ITEM_FDS; |
9097fe29 LP |
132 | memcpy((*d)->fds, fds, sizeof(int) * n_fds); |
133 | ||
febfd508 | 134 | *d = (struct kdbus_item *) ((uint8_t*) *d + (*d)->size); |
9097fe29 LP |
135 | } |
136 | ||
18a28147 KS |
137 | static int bus_message_setup_bloom(sd_bus_message *m, struct kdbus_bloom_filter *bloom) { |
138 | void *data; | |
a56f19c4 LP |
139 | unsigned i; |
140 | int r; | |
141 | ||
142 | assert(m); | |
143 | assert(bloom); | |
144 | ||
18a28147 | 145 | data = bloom->data; |
29804cc1 | 146 | memzero(data, m->bus->bloom_size); |
18a28147 | 147 | bloom->generation = 0; |
a56f19c4 | 148 | |
b28ff39f | 149 | 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 |
150 | |
151 | if (m->interface) | |
b28ff39f | 152 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "interface", m->interface); |
a56f19c4 | 153 | if (m->member) |
b28ff39f | 154 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "member", m->member); |
a56f19c4 | 155 | if (m->path) { |
b28ff39f LP |
156 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path", m->path); |
157 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path); | |
158 | bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, "path-slash-prefix", m->path, '/'); | |
a56f19c4 LP |
159 | } |
160 | ||
161 | r = sd_bus_message_rewind(m, true); | |
162 | if (r < 0) | |
163 | return r; | |
164 | ||
165 | for (i = 0; i < 64; i++) { | |
166 | char type; | |
167 | const char *t; | |
168 | char buf[sizeof("arg")-1 + 2 + sizeof("-slash-prefix")]; | |
169 | char *e; | |
170 | ||
171 | r = sd_bus_message_peek_type(m, &type, NULL); | |
172 | if (r < 0) | |
173 | return r; | |
174 | ||
175 | if (type != SD_BUS_TYPE_STRING && | |
176 | type != SD_BUS_TYPE_OBJECT_PATH && | |
177 | type != SD_BUS_TYPE_SIGNATURE) | |
178 | break; | |
179 | ||
180 | r = sd_bus_message_read_basic(m, type, &t); | |
181 | if (r < 0) | |
182 | return r; | |
183 | ||
184 | e = stpcpy(buf, "arg"); | |
185 | if (i < 10) | |
693eb9a2 | 186 | *(e++) = '0' + (char) i; |
a56f19c4 | 187 | else { |
693eb9a2 LP |
188 | *(e++) = '0' + (char) (i / 10); |
189 | *(e++) = '0' + (char) (i % 10); | |
a56f19c4 LP |
190 | } |
191 | ||
192 | *e = 0; | |
b28ff39f | 193 | bloom_add_pair(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t); |
a56f19c4 LP |
194 | |
195 | strcpy(e, "-dot-prefix"); | |
b28ff39f | 196 | bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t, '.'); |
a56f19c4 | 197 | strcpy(e, "-slash-prefix"); |
b28ff39f | 198 | bloom_add_prefixes(data, m->bus->bloom_size, m->bus->bloom_n_hash, buf, t, '/'); |
a56f19c4 LP |
199 | } |
200 | ||
201 | return 0; | |
b5baa8fe LP |
202 | } |
203 | ||
5b7d4c1c | 204 | static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) { |
9b29bb68 | 205 | struct bus_body_part *part; |
febfd508 | 206 | struct kdbus_item *d; |
6629161f LP |
207 | bool well_known; |
208 | uint64_t unique; | |
209 | size_t sz, dl; | |
9b29bb68 | 210 | unsigned i; |
6629161f LP |
211 | int r; |
212 | ||
5b7d4c1c | 213 | assert(b); |
6629161f LP |
214 | assert(m); |
215 | assert(m->sealed); | |
e9a967f9 | 216 | |
069f5e61 LP |
217 | /* We put this together only once, if this message is reused |
218 | * we reuse the earlier-built version */ | |
e9a967f9 LP |
219 | if (m->kdbus) |
220 | return 0; | |
6629161f LP |
221 | |
222 | if (m->destination) { | |
c7819669 | 223 | r = bus_kernel_parse_unique_name(m->destination, &unique); |
6629161f LP |
224 | if (r < 0) |
225 | return r; | |
226 | ||
227 | well_known = r == 0; | |
228 | } else | |
229 | well_known = false; | |
230 | ||
b1454bf0 | 231 | sz = offsetof(struct kdbus_msg, items); |
6629161f | 232 | |
a392d361 LP |
233 | assert_cc(ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)) == |
234 | ALIGN8(offsetof(struct kdbus_item, memfd) + sizeof(struct kdbus_memfd))); | |
235 | ||
69aec65c | 236 | /* Add in fixed header, fields header and payload */ |
c91cb83c | 237 | sz += (1 + m->n_body_parts) * |
bc7fd8cd | 238 | ALIGN8(offsetof(struct kdbus_item, vec) + sizeof(struct kdbus_vec)); |
6629161f | 239 | |
69aec65c | 240 | /* Add space for bloom filter */ |
18a28147 KS |
241 | sz += ALIGN8(offsetof(struct kdbus_item, bloom_filter) + |
242 | offsetof(struct kdbus_bloom_filter, data) + | |
b28ff39f | 243 | m->bus->bloom_size); |
b5baa8fe | 244 | |
6629161f LP |
245 | /* Add in well-known destination header */ |
246 | if (well_known) { | |
247 | dl = strlen(m->destination); | |
febfd508 | 248 | sz += ALIGN8(offsetof(struct kdbus_item, str) + dl + 1); |
6629161f LP |
249 | } |
250 | ||
9097fe29 LP |
251 | /* Add space for unix fds */ |
252 | if (m->n_fds > 0) | |
febfd508 | 253 | sz += ALIGN8(offsetof(struct kdbus_item, fds) + sizeof(int)*m->n_fds); |
9097fe29 | 254 | |
c556fe79 | 255 | m->kdbus = memalign(8, sz); |
66b26c5c LP |
256 | if (!m->kdbus) { |
257 | r = -ENOMEM; | |
258 | goto fail; | |
259 | } | |
6629161f | 260 | |
66b26c5c | 261 | m->free_kdbus = true; |
29804cc1 | 262 | memzero(m->kdbus, sz); |
d9115e18 | 263 | |
6629161f | 264 | m->kdbus->flags = |
0461f8cd | 265 | ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) | |
97f82db3 | 266 | ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0); |
6629161f LP |
267 | m->kdbus->dst_id = |
268 | well_known ? 0 : | |
b5baa8fe | 269 | m->destination ? unique : KDBUS_DST_ID_BROADCAST; |
6647dc66 | 270 | m->kdbus->payload_type = KDBUS_PAYLOAD_DBUS; |
42c4ebcb | 271 | m->kdbus->cookie = (uint64_t) m->header->serial; |
ca7b42c8 | 272 | m->kdbus->priority = m->priority; |
80a33f11 | 273 | |
03785ad0 | 274 | if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) { |
693eb9a2 | 275 | m->kdbus->cookie_reply = m->reply_cookie; |
03785ad0 DM |
276 | } else { |
277 | struct timespec now; | |
278 | ||
b680a194 | 279 | assert_se(clock_gettime(CLOCK_MONOTONIC_COARSE, &now) == 0); |
03785ad0 DM |
280 | m->kdbus->timeout_ns = now.tv_sec * NSEC_PER_SEC + now.tv_nsec + |
281 | m->timeout * NSEC_PER_USEC; | |
282 | } | |
6629161f | 283 | |
b1454bf0 | 284 | d = m->kdbus->items; |
6629161f LP |
285 | |
286 | if (well_known) | |
287 | append_destination(&d, m->destination, dl); | |
288 | ||
c91cb83c | 289 | append_payload_vec(&d, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
a392d361 LP |
290 | |
291 | MESSAGE_FOREACH_PART(part, i, m) { | |
292 | if (part->is_zero) { | |
66b26c5c LP |
293 | /* If this is padding then simply send a |
294 | * vector with a NULL data pointer which the | |
295 | * kernel will just pass through. This is the | |
296 | * most efficient way to encode zeroes */ | |
297 | ||
a392d361 LP |
298 | append_payload_vec(&d, NULL, part->size); |
299 | continue; | |
300 | } | |
301 | ||
66b26c5c LP |
302 | if (part->memfd >= 0 && part->sealed && m->destination) { |
303 | /* Try to send a memfd, if the part is | |
304 | * sealed and this is not a broadcast. Since we can only */ | |
a392d361 | 305 | |
66b26c5c LP |
306 | append_payload_memfd(&d, part->memfd, part->size); |
307 | continue; | |
a392d361 LP |
308 | } |
309 | ||
73e231ab JE |
310 | /* Otherwise, let's send a vector to the actual data. |
311 | * For that, we need to map it first. */ | |
66b26c5c LP |
312 | r = bus_body_part_map(part); |
313 | if (r < 0) | |
314 | goto fail; | |
a392d361 | 315 | |
bc7fd8cd | 316 | append_payload_vec(&d, part->data, part->size); |
a392d361 | 317 | } |
6629161f | 318 | |
5b7d4c1c | 319 | if (m->kdbus->dst_id == KDBUS_DST_ID_BROADCAST) { |
18a28147 | 320 | struct kdbus_bloom_filter *bloom; |
5b7d4c1c | 321 | |
b28ff39f | 322 | bloom = append_bloom(&d, m->bus->bloom_size); |
18a28147 | 323 | r = bus_message_setup_bloom(m, bloom); |
a392d361 LP |
324 | if (r < 0) |
325 | goto fail; | |
5b7d4c1c | 326 | } |
b5baa8fe | 327 | |
9097fe29 LP |
328 | if (m->n_fds > 0) |
329 | append_fds(&d, m->fds, m->n_fds); | |
330 | ||
e9a967f9 | 331 | m->kdbus->size = (uint8_t*) d - (uint8_t*) m->kdbus; |
6629161f LP |
332 | assert(m->kdbus->size <= sz); |
333 | ||
334 | return 0; | |
a392d361 LP |
335 | |
336 | fail: | |
66b26c5c | 337 | m->poisoned = true; |
a392d361 | 338 | return r; |
6629161f LP |
339 | } |
340 | ||
125dd074 ZJS |
341 | static void unset_memfds(struct sd_bus_message *m) { |
342 | struct bus_body_part *part; | |
343 | unsigned i; | |
344 | ||
345 | assert(m); | |
346 | ||
347 | /* Make sure the memfds are not freed twice */ | |
348 | MESSAGE_FOREACH_PART(part, i, m) | |
349 | if (part->memfd >= 0) | |
350 | part->memfd = -1; | |
351 | } | |
352 | ||
cb67f718 DM |
353 | static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k) { |
354 | sd_bus_message *m = NULL; | |
355 | struct kdbus_item *d; | |
356 | unsigned n_fds = 0; | |
357 | _cleanup_free_ int *fds = NULL; | |
358 | struct bus_header *h = NULL; | |
359 | size_t total, n_bytes = 0, idx = 0; | |
360 | const char *destination = NULL, *seclabel = NULL; | |
6629161f LP |
361 | int r; |
362 | ||
cb67f718 DM |
363 | assert(bus); |
364 | assert(k); | |
365 | assert(k->payload_type == KDBUS_PAYLOAD_DBUS); | |
35460afc | 366 | |
cb67f718 DM |
367 | KDBUS_ITEM_FOREACH(d, k, items) { |
368 | size_t l; | |
f08838da | 369 | |
cb67f718 | 370 | l = d->size - offsetof(struct kdbus_item, data); |
8f155917 | 371 | |
cb67f718 | 372 | switch (d->type) { |
62b3e928 | 373 | |
cb67f718 DM |
374 | case KDBUS_ITEM_PAYLOAD_OFF: |
375 | if (!h) { | |
376 | h = (struct bus_header *)((uint8_t *)k + d->vec.offset); | |
8a0e0ed9 | 377 | |
cb67f718 DM |
378 | if (!bus_header_is_complete(h, d->vec.size)) |
379 | return -EBADMSG; | |
380 | } | |
8a0e0ed9 | 381 | |
cb67f718 DM |
382 | n_bytes += d->vec.size; |
383 | break; | |
8a0e0ed9 | 384 | |
cb67f718 DM |
385 | case KDBUS_ITEM_PAYLOAD_MEMFD: |
386 | if (!h) | |
387 | return -EBADMSG; | |
8a0e0ed9 | 388 | |
cb67f718 DM |
389 | n_bytes += d->memfd.size; |
390 | break; | |
8a0e0ed9 | 391 | |
cb67f718 DM |
392 | case KDBUS_ITEM_FDS: { |
393 | int *f; | |
394 | unsigned j; | |
8a0e0ed9 | 395 | |
cb67f718 DM |
396 | j = l / sizeof(int); |
397 | f = realloc(fds, sizeof(int) * (n_fds + j)); | |
398 | if (!f) | |
399 | return -ENOMEM; | |
8a0e0ed9 | 400 | |
cb67f718 DM |
401 | fds = f; |
402 | memcpy(fds + n_fds, d->fds, sizeof(int) * j); | |
403 | n_fds += j; | |
404 | break; | |
405 | } | |
62b3e928 | 406 | |
cb67f718 DM |
407 | case KDBUS_ITEM_SECLABEL: |
408 | seclabel = d->str; | |
409 | break; | |
fd8d62d9 LP |
410 | } |
411 | } | |
412 | ||
cb67f718 DM |
413 | if (!h) |
414 | return -EBADMSG; | |
de297575 | 415 | |
cb67f718 DM |
416 | r = bus_header_message_size(h, &total); |
417 | if (r < 0) | |
418 | return r; | |
219728b3 | 419 | |
cb67f718 DM |
420 | if (n_bytes != total) |
421 | return -EBADMSG; | |
6629161f | 422 | |
cb67f718 DM |
423 | /* on kdbus we only speak native endian gvariant, never dbus1 |
424 | * marshalling or reverse endian */ | |
425 | if (h->version != 2 || | |
426 | h->endian != BUS_NATIVE_ENDIAN) | |
427 | return -EPROTOTYPE; | |
c58dea19 | 428 | |
cb67f718 DM |
429 | r = bus_message_from_header(bus, h, sizeof(struct bus_header), fds, n_fds, NULL, seclabel, 0, &m); |
430 | if (r < 0) | |
431 | return r; | |
6629161f | 432 | |
cb67f718 DM |
433 | /* The well-known names list is different from the other |
434 | credentials. If we asked for it, but nothing is there, this | |
435 | means that the list of well-known names is simply empty, not | |
436 | that we lack any data */ | |
35460afc | 437 | |
cb67f718 | 438 | m->creds.mask |= (SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES) & bus->creds_mask; |
f08838da | 439 | |
cb67f718 DM |
440 | KDBUS_ITEM_FOREACH(d, k, items) { |
441 | size_t l; | |
6629161f | 442 | |
cb67f718 | 443 | l = d->size - offsetof(struct kdbus_item, data); |
6629161f | 444 | |
cb67f718 | 445 | switch (d->type) { |
6629161f | 446 | |
cb67f718 DM |
447 | case KDBUS_ITEM_PAYLOAD_OFF: { |
448 | size_t begin_body; | |
6629161f | 449 | |
cb67f718 | 450 | begin_body = BUS_MESSAGE_BODY_BEGIN(m); |
6629161f | 451 | |
cb67f718 DM |
452 | if (idx + d->vec.size > begin_body) { |
453 | struct bus_body_part *part; | |
a43b9ca3 | 454 | |
cb67f718 | 455 | /* Contains body material */ |
6629161f | 456 | |
cb67f718 DM |
457 | part = message_append_part(m); |
458 | if (!part) { | |
459 | r = -ENOMEM; | |
460 | goto fail; | |
461 | } | |
a43b9ca3 | 462 | |
cb67f718 DM |
463 | /* A -1 offset is NUL padding. */ |
464 | part->is_zero = d->vec.offset == ~0ULL; | |
a43b9ca3 | 465 | |
cb67f718 DM |
466 | if (idx >= begin_body) { |
467 | if (!part->is_zero) | |
468 | part->data = (uint8_t *)k + d->vec.offset; | |
469 | part->size = d->vec.size; | |
470 | } else { | |
471 | if (!part->is_zero) | |
472 | part->data = (uint8_t *)k + d->vec.offset + (begin_body - idx); | |
473 | part->size = d->vec.size - (begin_body - idx); | |
474 | } | |
a43b9ca3 | 475 | |
cb67f718 | 476 | part->sealed = true; |
ff4994c5 | 477 | } |
a43b9ca3 | 478 | |
cb67f718 DM |
479 | idx += d->vec.size; |
480 | break; | |
481 | } | |
a43b9ca3 | 482 | |
cb67f718 DM |
483 | case KDBUS_ITEM_PAYLOAD_MEMFD: { |
484 | struct bus_body_part *part; | |
a43b9ca3 | 485 | |
cb67f718 DM |
486 | if (idx < BUS_MESSAGE_BODY_BEGIN(m)) { |
487 | r = -EBADMSG; | |
488 | goto fail; | |
ff4994c5 | 489 | } |
a43b9ca3 | 490 | |
cb67f718 DM |
491 | part = message_append_part(m); |
492 | if (!part) { | |
493 | r = -ENOMEM; | |
494 | goto fail; | |
495 | } | |
a43b9ca3 | 496 | |
cb67f718 DM |
497 | part->memfd = d->memfd.fd; |
498 | part->size = d->memfd.size; | |
499 | part->sealed = true; | |
a43b9ca3 | 500 | |
cb67f718 DM |
501 | idx += d->memfd.size; |
502 | break; | |
503 | } | |
a43b9ca3 | 504 | |
cb67f718 DM |
505 | case KDBUS_ITEM_CREDS: |
506 | /* UID/GID/PID are always valid */ | |
507 | m->creds.uid = (uid_t) d->creds.uid; | |
508 | m->creds.gid = (gid_t) d->creds.gid; | |
509 | m->creds.pid = (pid_t) d->creds.pid; | |
510 | m->creds.mask |= (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID) & bus->creds_mask; | |
a43b9ca3 | 511 | |
cb67f718 DM |
512 | /* The PID starttime/TID might be missing |
513 | * however, when the data is faked by some | |
514 | * data bus proxy and it lacks that | |
515 | * information about the real client since | |
516 | * SO_PEERCRED is used for that */ | |
6629161f | 517 | |
cb67f718 DM |
518 | if (d->creds.starttime > 0) { |
519 | m->creds.pid_starttime = d->creds.starttime / NSEC_PER_USEC; | |
520 | m->creds.mask |= SD_BUS_CREDS_PID_STARTTIME & bus->creds_mask; | |
521 | } | |
6629161f | 522 | |
cb67f718 DM |
523 | if (d->creds.tid > 0) { |
524 | m->creds.tid = (pid_t) d->creds.tid; | |
525 | m->creds.mask |= SD_BUS_CREDS_TID & bus->creds_mask; | |
526 | } | |
527 | break; | |
6629161f | 528 | |
cb67f718 | 529 | case KDBUS_ITEM_TIMESTAMP: |
41add995 LP |
530 | |
531 | if (bus->attach_flags & KDBUS_ATTACH_TIMESTAMP) { | |
532 | m->realtime = d->timestamp.realtime_ns / NSEC_PER_USEC; | |
533 | m->monotonic = d->timestamp.monotonic_ns / NSEC_PER_USEC; | |
534 | m->seqnum = d->timestamp.seqnum; | |
535 | } | |
536 | ||
cb67f718 | 537 | break; |
fd8d62d9 | 538 | |
cb67f718 DM |
539 | case KDBUS_ITEM_PID_COMM: |
540 | m->creds.comm = d->str; | |
541 | m->creds.mask |= SD_BUS_CREDS_COMM & bus->creds_mask; | |
542 | break; | |
fd8d62d9 | 543 | |
cb67f718 DM |
544 | case KDBUS_ITEM_TID_COMM: |
545 | m->creds.tid_comm = d->str; | |
546 | m->creds.mask |= SD_BUS_CREDS_TID_COMM & bus->creds_mask; | |
547 | break; | |
6629161f | 548 | |
cb67f718 DM |
549 | case KDBUS_ITEM_EXE: |
550 | m->creds.exe = d->str; | |
551 | m->creds.mask |= SD_BUS_CREDS_EXE & bus->creds_mask; | |
552 | break; | |
6629161f | 553 | |
cb67f718 DM |
554 | case KDBUS_ITEM_CMDLINE: |
555 | m->creds.cmdline = d->str; | |
556 | m->creds.cmdline_size = l; | |
557 | m->creds.mask |= SD_BUS_CREDS_CMDLINE & bus->creds_mask; | |
558 | break; | |
777d7a61 | 559 | |
cb67f718 DM |
560 | case KDBUS_ITEM_CGROUP: |
561 | m->creds.cgroup = d->str; | |
562 | 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 | 563 | |
fe3f22d1 DK |
564 | r = bus_get_root_path(bus); |
565 | if (r < 0) | |
566 | goto fail; | |
777d7a61 | 567 | |
cb67f718 | 568 | m->creds.cgroup_root = bus->cgroup_root; |
777d7a61 | 569 | |
cb67f718 | 570 | break; |
777d7a61 | 571 | |
cb67f718 DM |
572 | case KDBUS_ITEM_AUDIT: |
573 | m->creds.audit_session_id = (uint32_t) d->audit.sessionid; | |
574 | m->creds.audit_login_uid = (uid_t) d->audit.loginuid; | |
575 | m->creds.mask |= (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID) & bus->creds_mask; | |
576 | break; | |
777d7a61 | 577 | |
cb67f718 | 578 | case KDBUS_ITEM_CAPS: |
5ebe2ce7 DM |
579 | m->creds.capability = (uint8_t *) d->caps.caps; |
580 | m->creds.capability_size = d->size - offsetof(struct kdbus_item, caps.caps); | |
cb67f718 DM |
581 | 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; |
582 | break; | |
219728b3 | 583 | |
cb67f718 DM |
584 | case KDBUS_ITEM_DST_NAME: |
585 | if (!service_name_is_valid(d->str)) | |
586 | return -EBADMSG; | |
219728b3 | 587 | |
cb67f718 DM |
588 | destination = d->str; |
589 | break; | |
777d7a61 | 590 | |
cb67f718 DM |
591 | case KDBUS_ITEM_NAME: |
592 | if (!service_name_is_valid(d->name.name)) | |
593 | return -EBADMSG; | |
777d7a61 | 594 | |
cb67f718 DM |
595 | r = strv_extend(&m->creds.well_known_names, d->name.name); |
596 | if (r < 0) | |
597 | goto fail; | |
598 | break; | |
777d7a61 | 599 | |
cccb0b2c LP |
600 | case KDBUS_ITEM_CONN_NAME: |
601 | m->creds.conn_name = d->str; | |
602 | m->creds.mask |= SD_BUS_CREDS_CONNECTION_NAME & bus->creds_mask; | |
603 | break; | |
604 | ||
cb67f718 DM |
605 | case KDBUS_ITEM_FDS: |
606 | case KDBUS_ITEM_SECLABEL: | |
607 | break; | |
d78bf250 | 608 | |
cb67f718 DM |
609 | default: |
610 | log_debug("Got unknown field from kernel %llu", d->type); | |
611 | } | |
612 | } | |
d78bf250 | 613 | |
cb67f718 DM |
614 | r = bus_message_parse_fields(m); |
615 | if (r < 0) | |
616 | goto fail; | |
777d7a61 | 617 | |
cb67f718 DM |
618 | /* Override information from the user header with data from the kernel */ |
619 | if (k->src_id == KDBUS_SRC_ID_KERNEL) | |
620 | m->sender = m->creds.unique_name = (char*) "org.freedesktop.DBus"; | |
621 | else { | |
622 | snprintf(m->sender_buffer, sizeof(m->sender_buffer), ":1.%llu", (unsigned long long) k->src_id); | |
623 | m->sender = m->creds.unique_name = m->sender_buffer; | |
624 | } | |
777d7a61 | 625 | |
cb67f718 DM |
626 | if (destination) |
627 | m->destination = destination; | |
628 | else if (k->dst_id == KDBUS_DST_ID_BROADCAST) | |
629 | m->destination = NULL; | |
630 | else if (k->dst_id == KDBUS_DST_ID_NAME) | |
631 | m->destination = bus->unique_name; /* fill in unique name if the well-known name is missing */ | |
632 | else { | |
633 | snprintf(m->destination_buffer, sizeof(m->destination_buffer), ":1.%llu", (unsigned long long) k->dst_id); | |
634 | m->destination = m->destination_buffer; | |
635 | } | |
777d7a61 | 636 | |
cb67f718 DM |
637 | /* We take possession of the kmsg struct now */ |
638 | m->kdbus = k; | |
639 | m->release_kdbus = true; | |
640 | m->free_fds = true; | |
641 | fds = NULL; | |
777d7a61 | 642 | |
cb67f718 | 643 | bus->rqueue[bus->rqueue_size++] = m; |
777d7a61 | 644 | |
cb67f718 | 645 | return 1; |
777d7a61 | 646 | |
cb67f718 | 647 | fail: |
125dd074 ZJS |
648 | unset_memfds(m); |
649 | sd_bus_message_unref(m); | |
777d7a61 | 650 | |
cb67f718 DM |
651 | return r; |
652 | } | |
777d7a61 | 653 | |
cb67f718 DM |
654 | int bus_kernel_take_fd(sd_bus *b) { |
655 | struct kdbus_cmd_hello *hello; | |
656 | struct kdbus_item *item; | |
5972fe95 LP |
657 | _cleanup_free_ char *g = NULL; |
658 | const char *name; | |
659 | size_t l = 0, m = 0, sz; | |
cb67f718 | 660 | int r; |
777d7a61 | 661 | |
cb67f718 | 662 | assert(b); |
7adc46fc | 663 | |
cb67f718 DM |
664 | if (b->is_server) |
665 | return -EINVAL; | |
777d7a61 | 666 | |
cb67f718 | 667 | b->use_memfd = 1; |
777d7a61 | 668 | |
5972fe95 | 669 | if (b->connection_name) { |
a6278b88 | 670 | g = bus_label_escape(b->connection_name); |
5972fe95 LP |
671 | if (!g) |
672 | return -ENOMEM; | |
673 | ||
674 | name = g; | |
675 | } else { | |
676 | char pr[17] = {}; | |
677 | ||
678 | /* If no name is explicitly set, we'll include a hint | |
679 | * indicating the library implementation, a hint which | |
680 | * kind of bus this is and the thread name */ | |
681 | ||
682 | assert_se(prctl(PR_GET_NAME, (unsigned long) pr) >= 0); | |
683 | ||
684 | if (isempty(pr)) { | |
685 | name = b->is_system ? "sd-system" : | |
686 | b->is_user ? "sd-user" : "sd"; | |
687 | } else { | |
688 | _cleanup_free_ char *e = NULL; | |
689 | ||
a6278b88 | 690 | e = bus_label_escape(pr); |
5972fe95 LP |
691 | if (!e) |
692 | return -ENOMEM; | |
693 | ||
694 | g = strappend(b->is_system ? "sd-system-" : | |
695 | b->is_user ? "sd-user-" : "sd-", | |
696 | e); | |
697 | if (!g) | |
698 | return -ENOMEM; | |
699 | ||
700 | name = g; | |
701 | } | |
702 | ||
a6278b88 | 703 | b->connection_name = bus_label_unescape(name); |
5972fe95 LP |
704 | if (!b->connection_name) |
705 | return -ENOMEM; | |
706 | } | |
707 | ||
708 | m = strlen(name); | |
709 | ||
710 | sz = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) + | |
711 | ALIGN8(offsetof(struct kdbus_item, str) + m + 1); | |
777d7a61 | 712 | |
cb67f718 | 713 | if (b->fake_creds_valid) |
5972fe95 | 714 | sz += ALIGN8(offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds)); |
777d7a61 | 715 | |
cb67f718 DM |
716 | if (b->fake_label) { |
717 | l = strlen(b->fake_label); | |
718 | sz += ALIGN8(offsetof(struct kdbus_item, str) + l + 1); | |
719 | } | |
777d7a61 | 720 | |
7f3d3ba1 | 721 | hello = alloca0_align(sz, 8); |
cb67f718 | 722 | hello->size = sz; |
bc75205c | 723 | hello->flags = b->hello_flags; |
cb67f718 DM |
724 | hello->attach_flags = b->attach_flags; |
725 | hello->pool_size = KDBUS_POOL_SIZE; | |
777d7a61 | 726 | |
cb67f718 DM |
727 | item = hello->items; |
728 | ||
5972fe95 LP |
729 | item->size = offsetof(struct kdbus_item, str) + m + 1; |
730 | item->type = KDBUS_ITEM_CONN_NAME; | |
731 | memcpy(item->str, name, m + 1); | |
732 | item = KDBUS_ITEM_NEXT(item); | |
733 | ||
cb67f718 DM |
734 | if (b->fake_creds_valid) { |
735 | item->size = offsetof(struct kdbus_item, creds) + sizeof(struct kdbus_creds); | |
736 | item->type = KDBUS_ITEM_CREDS; | |
737 | item->creds = b->fake_creds; | |
738 | ||
739 | item = KDBUS_ITEM_NEXT(item); | |
777d7a61 LP |
740 | } |
741 | ||
cb67f718 DM |
742 | if (b->fake_label) { |
743 | item->size = offsetof(struct kdbus_item, str) + l + 1; | |
5972fe95 | 744 | item->type = KDBUS_ITEM_SECLABEL; |
cb67f718 | 745 | memcpy(item->str, b->fake_label, l+1); |
777d7a61 LP |
746 | } |
747 | ||
cb67f718 DM |
748 | r = ioctl(b->input_fd, KDBUS_CMD_HELLO, hello); |
749 | if (r < 0) | |
750 | return -errno; | |
777d7a61 | 751 | |
cb67f718 DM |
752 | if (!b->kdbus_buffer) { |
753 | b->kdbus_buffer = mmap(NULL, KDBUS_POOL_SIZE, PROT_READ, MAP_SHARED, b->input_fd, 0); | |
754 | if (b->kdbus_buffer == MAP_FAILED) { | |
755 | b->kdbus_buffer = NULL; | |
756 | return -errno; | |
757 | } | |
758 | } | |
6629161f | 759 | |
4a3e79e1 | 760 | /* The higher 32bit of the bus_flags fields are considered |
cb67f718 | 761 | * 'incompatible flags'. Refuse them all for now. */ |
4a3e79e1 | 762 | if (hello->bus_flags > 0xFFFFFFFFULL) |
cb67f718 | 763 | return -ENOTSUP; |
6629161f | 764 | |
b28ff39f | 765 | if (!bloom_validate_parameters((size_t) hello->bloom.size, (unsigned) hello->bloom.n_hash)) |
cb67f718 | 766 | return -ENOTSUP; |
6629161f | 767 | |
b28ff39f LP |
768 | b->bloom_size = (size_t) hello->bloom.size; |
769 | b->bloom_n_hash = (unsigned) hello->bloom.n_hash; | |
770 | ||
cb67f718 DM |
771 | if (asprintf(&b->unique_name, ":1.%llu", (unsigned long long) hello->id) < 0) |
772 | return -ENOMEM; | |
6629161f | 773 | |
cb67f718 | 774 | b->unique_id = hello->id; |
6629161f | 775 | |
cb67f718 DM |
776 | b->is_kernel = true; |
777 | b->bus_client = true; | |
bc75205c | 778 | b->can_fds = !!(hello->flags & KDBUS_HELLO_ACCEPT_FD); |
cb67f718 DM |
779 | b->message_version = 2; |
780 | b->message_endian = BUS_NATIVE_ENDIAN; | |
c91cb83c | 781 | |
cb67f718 DM |
782 | /* the kernel told us the UUID of the underlying bus */ |
783 | memcpy(b->server_id.bytes, hello->id128, sizeof(b->server_id.bytes)); | |
6629161f | 784 | |
cb67f718 DM |
785 | return bus_start_running(b); |
786 | } | |
6629161f | 787 | |
cb67f718 DM |
788 | int bus_kernel_connect(sd_bus *b) { |
789 | assert(b); | |
790 | assert(b->input_fd < 0); | |
791 | assert(b->output_fd < 0); | |
792 | assert(b->kernel); | |
1307c3ff | 793 | |
cb67f718 DM |
794 | if (b->is_server) |
795 | return -EINVAL; | |
1307c3ff | 796 | |
cb67f718 DM |
797 | b->input_fd = open(b->kernel, O_RDWR|O_NOCTTY|O_CLOEXEC); |
798 | if (b->input_fd < 0) | |
799 | return -errno; | |
6629161f | 800 | |
cb67f718 | 801 | b->output_fd = b->input_fd; |
6629161f | 802 | |
cb67f718 DM |
803 | return bus_kernel_take_fd(b); |
804 | } | |
f9be01f3 | 805 | |
069f5e61 | 806 | static void close_kdbus_msg(sd_bus *bus, struct kdbus_msg *k) { |
d663f1b1 | 807 | struct kdbus_cmd_free cmd; |
069f5e61 LP |
808 | struct kdbus_item *d; |
809 | ||
810 | assert(bus); | |
811 | assert(k); | |
812 | ||
d663f1b1 DM |
813 | cmd.flags = 0; |
814 | cmd.offset = (uint8_t *)k - (uint8_t *)bus->kdbus_buffer; | |
815 | ||
069f5e61 LP |
816 | KDBUS_ITEM_FOREACH(d, k, items) { |
817 | ||
818 | if (d->type == KDBUS_ITEM_FDS) | |
819 | close_many(d->fds, (d->size - offsetof(struct kdbus_item, fds)) / sizeof(int)); | |
820 | else if (d->type == KDBUS_ITEM_PAYLOAD_MEMFD) | |
03e334a1 | 821 | safe_close(d->memfd.fd); |
069f5e61 | 822 | } |
ca794c8e DM |
823 | |
824 | (void) ioctl(bus->input_fd, KDBUS_CMD_FREE, &cmd); | |
069f5e61 LP |
825 | } |
826 | ||
827 | int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m, bool hint_sync_call) { | |
cb67f718 | 828 | int r; |
6629161f | 829 | |
cb67f718 DM |
830 | assert(bus); |
831 | assert(m); | |
832 | assert(bus->state == BUS_RUNNING); | |
6629161f | 833 | |
cb67f718 DM |
834 | /* If we can't deliver, we want room for the error message */ |
835 | r = bus_rqueue_make_room(bus); | |
6629161f LP |
836 | if (r < 0) |
837 | return r; | |
838 | ||
cb67f718 | 839 | r = bus_message_setup_kmsg(bus, m); |
6629161f LP |
840 | if (r < 0) |
841 | return r; | |
842 | ||
069f5e61 LP |
843 | /* If this is a synchronous method call, then let's tell the |
844 | * kernel, so that it can pass CPU time/scheduling to the | |
845 | * destination for the time, if it wants to. If we | |
846 | * synchronously wait for the result anyway, we won't need CPU | |
847 | * anyway. */ | |
848 | if (hint_sync_call) | |
849 | m->kdbus->flags |= KDBUS_MSG_FLAGS_EXPECT_REPLY|KDBUS_MSG_FLAGS_SYNC_REPLY; | |
850 | ||
cb67f718 DM |
851 | r = ioctl(bus->output_fd, KDBUS_CMD_MSG_SEND, m->kdbus); |
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) { |
45fbe937 LP |
1122 | int r; |
1123 | ||
76b7742c | 1124 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1125 | |
73843b52 | 1126 | r = memfd_new(bus->connection_name); |
9b05bc48 | 1127 | if (r < 0) |
73843b52 | 1128 | return r; |
bc7fd8cd LP |
1129 | |
1130 | *address = NULL; | |
8e959fbf LP |
1131 | *mapped = 0; |
1132 | *allocated = 0; | |
a6082d77 | 1133 | return r; |
bc7fd8cd LP |
1134 | } |
1135 | ||
bf30e48f | 1136 | c = &bus->memfd_cache[--bus->n_memfd_cache]; |
bc7fd8cd LP |
1137 | |
1138 | assert(c->fd >= 0); | |
8e959fbf | 1139 | assert(c->mapped == 0 || c->address); |
bc7fd8cd LP |
1140 | |
1141 | *address = c->address; | |
8e959fbf LP |
1142 | *mapped = c->mapped; |
1143 | *allocated = c->allocated; | |
45fbe937 LP |
1144 | fd = c->fd; |
1145 | ||
76b7742c | 1146 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1147 | |
45fbe937 LP |
1148 | return fd; |
1149 | } | |
1150 | ||
1151 | static void close_and_munmap(int fd, void *address, size_t size) { | |
1152 | if (size > 0) | |
76b7742c | 1153 | assert_se(munmap(address, PAGE_ALIGN(size)) >= 0); |
45fbe937 | 1154 | |
03e334a1 | 1155 | safe_close(fd); |
bc7fd8cd LP |
1156 | } |
1157 | ||
8e959fbf | 1158 | void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t mapped, size_t allocated) { |
bc7fd8cd | 1159 | struct memfd_cache *c; |
8e959fbf | 1160 | uint64_t max_mapped = PAGE_ALIGN(MEMFD_CACHE_ITEM_SIZE_MAX); |
bc7fd8cd LP |
1161 | |
1162 | assert(fd >= 0); | |
8e959fbf | 1163 | assert(mapped == 0 || address); |
bc7fd8cd | 1164 | |
45fbe937 | 1165 | if (!bus || !bus->is_kernel) { |
8e959fbf | 1166 | close_and_munmap(fd, address, mapped); |
45fbe937 LP |
1167 | return; |
1168 | } | |
1169 | ||
76b7742c | 1170 | assert_se(pthread_mutex_lock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1171 | |
45fbe937 | 1172 | if (bus->n_memfd_cache >= ELEMENTSOF(bus->memfd_cache)) { |
76b7742c | 1173 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd | 1174 | |
8e959fbf | 1175 | close_and_munmap(fd, address, mapped); |
bc7fd8cd LP |
1176 | return; |
1177 | } | |
1178 | ||
1179 | c = &bus->memfd_cache[bus->n_memfd_cache++]; | |
1180 | c->fd = fd; | |
1181 | c->address = address; | |
1182 | ||
1183 | /* If overly long, let's return a bit to the OS */ | |
8e959fbf | 1184 | if (mapped > max_mapped) { |
73843b52 | 1185 | assert_se(memfd_set_size(fd, max_mapped) >= 0); |
8e959fbf LP |
1186 | assert_se(munmap((uint8_t*) address + max_mapped, PAGE_ALIGN(mapped - max_mapped)) >= 0); |
1187 | c->mapped = c->allocated = max_mapped; | |
1188 | } else { | |
1189 | c->mapped = mapped; | |
1190 | c->allocated = allocated; | |
1191 | } | |
45fbe937 | 1192 | |
76b7742c | 1193 | assert_se(pthread_mutex_unlock(&bus->memfd_cache_mutex) >= 0); |
bc7fd8cd LP |
1194 | } |
1195 | ||
1196 | void bus_kernel_flush_memfd(sd_bus *b) { | |
1197 | unsigned i; | |
1198 | ||
1199 | assert(b); | |
1200 | ||
76b7742c | 1201 | for (i = 0; i < b->n_memfd_cache; i++) |
8e959fbf | 1202 | close_and_munmap(b->memfd_cache[i].fd, b->memfd_cache[i].address, b->memfd_cache[i].mapped); |
bc7fd8cd | 1203 | } |
0253ddcc | 1204 | |
e3dd987c LP |
1205 | int kdbus_translate_request_name_flags(uint64_t flags, uint64_t *kdbus_flags) { |
1206 | uint64_t f = 0; | |
0253ddcc | 1207 | |
e3dd987c | 1208 | assert(kdbus_flags); |
0253ddcc | 1209 | |
e3dd987c LP |
1210 | if (flags & SD_BUS_NAME_ALLOW_REPLACEMENT) |
1211 | f |= KDBUS_NAME_ALLOW_REPLACEMENT; | |
0253ddcc | 1212 | |
e3dd987c LP |
1213 | if (flags & SD_BUS_NAME_REPLACE_EXISTING) |
1214 | f |= KDBUS_NAME_REPLACE_EXISTING; | |
0253ddcc | 1215 | |
d90bb669 | 1216 | if (flags & SD_BUS_NAME_QUEUE) |
e3dd987c | 1217 | f |= KDBUS_NAME_QUEUE; |
0253ddcc | 1218 | |
e3dd987c LP |
1219 | *kdbus_flags = f; |
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | int kdbus_translate_attach_flags(uint64_t mask, uint64_t *kdbus_mask) { | |
1224 | uint64_t m = 0; | |
1225 | ||
1226 | assert(kdbus_mask); | |
1227 | ||
1228 | if (mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_GID|SD_BUS_CREDS_PID|SD_BUS_CREDS_PID_STARTTIME|SD_BUS_CREDS_TID)) | |
1229 | m |= KDBUS_ATTACH_CREDS; | |
1230 | ||
a2243d54 DM |
1231 | if (mask & SD_BUS_CREDS_COMM) |
1232 | m |= KDBUS_ATTACH_PID_COMM; | |
1233 | ||
1234 | if (mask & SD_BUS_CREDS_TID_COMM) | |
1235 | m |= KDBUS_ATTACH_TID_COMM; | |
e3dd987c LP |
1236 | |
1237 | if (mask & SD_BUS_CREDS_EXE) | |
1238 | m |= KDBUS_ATTACH_EXE; | |
1239 | ||
1240 | if (mask & SD_BUS_CREDS_CMDLINE) | |
1241 | m |= KDBUS_ATTACH_CMDLINE; | |
1242 | ||
1243 | 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)) | |
1244 | m |= KDBUS_ATTACH_CGROUP; | |
1245 | ||
1246 | if (mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) | |
1247 | m |= KDBUS_ATTACH_CAPS; | |
1248 | ||
1249 | if (mask & SD_BUS_CREDS_SELINUX_CONTEXT) | |
1250 | m |= KDBUS_ATTACH_SECLABEL; | |
0253ddcc | 1251 | |
e3dd987c LP |
1252 | if (mask & (SD_BUS_CREDS_AUDIT_SESSION_ID|SD_BUS_CREDS_AUDIT_LOGIN_UID)) |
1253 | m |= KDBUS_ATTACH_AUDIT; | |
1254 | ||
49b832c5 LP |
1255 | if (mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) |
1256 | m |= KDBUS_ATTACH_NAMES; | |
1257 | ||
cccb0b2c LP |
1258 | if (mask & SD_BUS_CREDS_CONNECTION_NAME) |
1259 | m |= KDBUS_ATTACH_CONN_NAME; | |
1260 | ||
e3dd987c | 1261 | *kdbus_mask = m; |
0253ddcc DM |
1262 | return 0; |
1263 | } | |
e3dd987c | 1264 | |
f2769777 | 1265 | int bus_kernel_create_bus(const char *name, bool world, char **s) { |
816a3f9e | 1266 | struct kdbus_cmd_make *make; |
e3dd987c LP |
1267 | struct kdbus_item *n; |
1268 | int fd; | |
1269 | ||
1270 | assert(name); | |
1271 | assert(s); | |
1272 | ||
1273 | fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1274 | if (fd < 0) | |
1275 | return -errno; | |
1276 | ||
7f3d3ba1 DH |
1277 | make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd_make, items) + |
1278 | offsetof(struct kdbus_item, data64) + sizeof(uint64_t) + | |
1279 | offsetof(struct kdbus_item, str) + | |
1280 | DECIMAL_STR_MAX(uid_t) + 1 + strlen(name) + 1), | |
1281 | 8); | |
e3dd987c | 1282 | |
816a3f9e DM |
1283 | make->size = offsetof(struct kdbus_cmd_make, items); |
1284 | ||
e3dd987c | 1285 | n = make->items; |
18a28147 KS |
1286 | n->size = offsetof(struct kdbus_item, bloom_parameter) + |
1287 | sizeof(struct kdbus_bloom_parameter); | |
1288 | n->type = KDBUS_ITEM_BLOOM_PARAMETER; | |
b28ff39f LP |
1289 | |
1290 | n->bloom_parameter.size = DEFAULT_BLOOM_SIZE; | |
1291 | n->bloom_parameter.n_hash = DEFAULT_BLOOM_N_HASH; | |
1292 | ||
1293 | assert_cc(DEFAULT_BLOOM_SIZE > 0); | |
1294 | assert_cc(DEFAULT_BLOOM_N_HASH > 0); | |
1295 | ||
816a3f9e DM |
1296 | make->size += ALIGN8(n->size); |
1297 | ||
1298 | n = KDBUS_ITEM_NEXT(n); | |
a4152e3f | 1299 | sprintf(n->str, UID_FMT "-%s", getuid(), name); |
e3dd987c | 1300 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; |
5e16c257 | 1301 | n->type = KDBUS_ITEM_MAKE_NAME; |
816a3f9e | 1302 | make->size += ALIGN8(n->size); |
e3dd987c | 1303 | |
f7c7cd03 | 1304 | make->flags = world ? KDBUS_MAKE_ACCESS_WORLD : 0; |
e3dd987c LP |
1305 | |
1306 | if (ioctl(fd, KDBUS_CMD_BUS_MAKE, make) < 0) { | |
03e334a1 | 1307 | safe_close(fd); |
e3dd987c LP |
1308 | return -errno; |
1309 | } | |
1310 | ||
1311 | if (s) { | |
1312 | char *p; | |
1313 | ||
1314 | p = strjoin("/dev/kdbus/", n->str, "/bus", NULL); | |
1315 | if (!p) { | |
03e334a1 | 1316 | safe_close(fd); |
e3dd987c LP |
1317 | return -ENOMEM; |
1318 | } | |
1319 | ||
1320 | *s = p; | |
1321 | } | |
1322 | ||
1323 | return fd; | |
1324 | } | |
9bd37b40 | 1325 | |
5369c77d | 1326 | static int bus_kernel_translate_access(BusPolicyAccess access) { |
a4152e3f | 1327 | assert(access >= 0); |
5369c77d | 1328 | assert(access < _BUS_POLICY_ACCESS_MAX); |
a4152e3f LP |
1329 | |
1330 | switch (access) { | |
1331 | ||
5369c77d | 1332 | case BUS_POLICY_ACCESS_SEE: |
a4152e3f LP |
1333 | return KDBUS_POLICY_SEE; |
1334 | ||
5369c77d | 1335 | case BUS_POLICY_ACCESS_TALK: |
a4152e3f LP |
1336 | return KDBUS_POLICY_TALK; |
1337 | ||
5369c77d | 1338 | case BUS_POLICY_ACCESS_OWN: |
a4152e3f LP |
1339 | return KDBUS_POLICY_OWN; |
1340 | ||
1341 | default: | |
1342 | assert_not_reached("Unknown policy access"); | |
1343 | } | |
1344 | } | |
1345 | ||
1346 | static int bus_kernel_translate_policy(const BusNamePolicy *policy, struct kdbus_item *item) { | |
1347 | int r; | |
09365592 LP |
1348 | |
1349 | assert(policy); | |
1350 | assert(item); | |
1351 | ||
1683342a | 1352 | switch (policy->type) { |
09365592 | 1353 | |
a4152e3f LP |
1354 | case BUSNAME_POLICY_TYPE_USER: { |
1355 | const char *user = policy->name; | |
1356 | uid_t uid; | |
1357 | ||
1358 | r = get_user_creds(&user, &uid, NULL, NULL, NULL); | |
1359 | if (r < 0) | |
1360 | return r; | |
1361 | ||
1683342a | 1362 | item->policy_access.type = KDBUS_POLICY_ACCESS_USER; |
a4152e3f | 1363 | item->policy_access.id = uid; |
1683342a | 1364 | break; |
a4152e3f | 1365 | } |
1683342a | 1366 | |
a4152e3f LP |
1367 | case BUSNAME_POLICY_TYPE_GROUP: { |
1368 | const char *group = policy->name; | |
1369 | gid_t gid; | |
1683342a | 1370 | |
a4152e3f LP |
1371 | r = get_group_creds(&group, &gid); |
1372 | if (r < 0) | |
1373 | return r; | |
1374 | ||
1375 | item->policy_access.type = KDBUS_POLICY_ACCESS_GROUP; | |
1376 | item->policy_access.id = gid; | |
1683342a | 1377 | break; |
a4152e3f | 1378 | } |
1683342a DM |
1379 | |
1380 | default: | |
1381 | assert_not_reached("Unknown policy type"); | |
1382 | } | |
1383 | ||
a4152e3f | 1384 | item->policy_access.access = bus_kernel_translate_access(policy->access); |
09365592 | 1385 | |
a4152e3f LP |
1386 | return 0; |
1387 | } | |
1683342a | 1388 | |
8f077bf9 | 1389 | int bus_kernel_open_bus_fd(const char *bus, char **path) { |
a4152e3f LP |
1390 | char *p; |
1391 | int fd; | |
8f077bf9 | 1392 | size_t len; |
1683342a | 1393 | |
8f077bf9 ZJS |
1394 | len = strlen("/dev/kdbus/") + DECIMAL_STR_MAX(uid_t) + 1 + strlen(bus) + strlen("/bus") + 1; |
1395 | ||
1396 | if (path) { | |
1397 | p = malloc(len); | |
1398 | if (!p) | |
1399 | return -ENOMEM; | |
1400 | *path = p; | |
1401 | } else | |
1402 | p = alloca(len); | |
a4152e3f | 1403 | sprintf(p, "/dev/kdbus/" UID_FMT "-%s/bus", getuid(), bus); |
1683342a | 1404 | |
a4152e3f LP |
1405 | fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC); |
1406 | if (fd < 0) | |
1407 | return -errno; | |
1408 | ||
1409 | return fd; | |
1683342a DM |
1410 | } |
1411 | ||
e7d718af | 1412 | int bus_kernel_create_endpoint(const char *bus_name, const char *ep_name, char **ep_path) { |
8e00bfc2 | 1413 | _cleanup_free_ char *path = NULL; |
e7d718af DM |
1414 | struct kdbus_cmd_make *make; |
1415 | struct kdbus_item *n; | |
1416 | size_t size; | |
1417 | int fd; | |
1418 | ||
1419 | fd = bus_kernel_open_bus_fd(bus_name, &path); | |
1420 | if (fd < 0) | |
1421 | return fd; | |
1422 | ||
1423 | size = ALIGN8(offsetof(struct kdbus_cmd_make, items)); | |
1424 | size += ALIGN8(offsetof(struct kdbus_item, str) + strlen(ep_name) + 1); | |
1425 | ||
7f3d3ba1 | 1426 | make = alloca0_align(size, 8); |
e7d718af DM |
1427 | make->size = size; |
1428 | make->flags = KDBUS_MAKE_ACCESS_WORLD; | |
1429 | ||
1430 | n = make->items; | |
1431 | ||
1432 | n->type = KDBUS_ITEM_MAKE_NAME; | |
1433 | n->size = offsetof(struct kdbus_item, str) + strlen(ep_name) + 1; | |
1434 | strcpy(n->str, ep_name); | |
1435 | ||
40885bb2 | 1436 | if (ioctl(fd, KDBUS_CMD_ENDPOINT_MAKE, make) < 0) { |
e7d718af DM |
1437 | safe_close(fd); |
1438 | return -errno; | |
1439 | } | |
1440 | ||
e7d718af | 1441 | if (ep_path) { |
2c652b6b LP |
1442 | char *p; |
1443 | ||
1444 | p = strjoin(dirname(path), "/", ep_name, NULL); | |
1445 | if (!p) { | |
4edf33d1 | 1446 | safe_close(fd); |
e7d718af | 1447 | return -ENOMEM; |
4edf33d1 | 1448 | } |
2c652b6b LP |
1449 | |
1450 | *ep_path = p; | |
e7d718af DM |
1451 | } |
1452 | ||
1453 | return fd; | |
1454 | } | |
1455 | ||
1456 | int bus_kernel_set_endpoint_policy(int fd, uid_t uid, BusEndpoint *ep) { | |
1457 | ||
1458 | struct kdbus_cmd_update *update; | |
1459 | struct kdbus_item *n; | |
1460 | BusEndpointPolicy *po; | |
1461 | Iterator i; | |
1462 | size_t size; | |
1463 | int r; | |
1464 | ||
1465 | size = ALIGN8(offsetof(struct kdbus_cmd_update, items)); | |
1466 | ||
1467 | HASHMAP_FOREACH(po, ep->policy_hash, i) { | |
1468 | size += ALIGN8(offsetof(struct kdbus_item, str) + strlen(po->name) + 1); | |
1469 | size += ALIGN8(offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access)); | |
1470 | } | |
1471 | ||
7f3d3ba1 | 1472 | update = alloca0_align(size, 8); |
e7d718af DM |
1473 | update->size = size; |
1474 | ||
1475 | n = update->items; | |
1476 | ||
1477 | HASHMAP_FOREACH(po, ep->policy_hash, i) { | |
1478 | n->type = KDBUS_ITEM_NAME; | |
1479 | n->size = offsetof(struct kdbus_item, str) + strlen(po->name) + 1; | |
1480 | strcpy(n->str, po->name); | |
1481 | n = KDBUS_ITEM_NEXT(n); | |
1482 | ||
1483 | n->type = KDBUS_ITEM_POLICY_ACCESS; | |
1484 | n->size = offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access); | |
1485 | ||
1486 | n->policy_access.type = KDBUS_POLICY_ACCESS_USER; | |
1487 | n->policy_access.access = bus_kernel_translate_access(po->access); | |
1488 | n->policy_access.id = uid; | |
1489 | ||
1490 | n = KDBUS_ITEM_NEXT(n); | |
1491 | } | |
1492 | ||
40885bb2 | 1493 | r = ioctl(fd, KDBUS_CMD_ENDPOINT_UPDATE, update); |
e7d718af DM |
1494 | if (r < 0) |
1495 | return -errno; | |
1496 | ||
1497 | return 0; | |
1498 | } | |
1499 | ||
a4152e3f LP |
1500 | int bus_kernel_make_starter( |
1501 | int fd, | |
1502 | const char *name, | |
1503 | bool activating, | |
1504 | bool accept_fd, | |
1505 | BusNamePolicy *policy, | |
5369c77d | 1506 | BusPolicyAccess world_policy) { |
a4152e3f | 1507 | |
e821075a LP |
1508 | struct kdbus_cmd_hello *hello; |
1509 | struct kdbus_item *n; | |
1683342a DM |
1510 | size_t policy_cnt = 0; |
1511 | BusNamePolicy *po; | |
1512 | size_t size; | |
a4152e3f | 1513 | int r; |
e821075a | 1514 | |
a4152e3f | 1515 | assert(fd >= 0); |
e821075a LP |
1516 | assert(name); |
1517 | ||
1683342a DM |
1518 | LIST_FOREACH(policy, po, policy) |
1519 | policy_cnt++; | |
1520 | ||
a4152e3f LP |
1521 | if (world_policy >= 0) |
1522 | policy_cnt++; | |
1523 | ||
1683342a DM |
1524 | size = ALIGN8(offsetof(struct kdbus_cmd_hello, items)) + |
1525 | ALIGN8(offsetof(struct kdbus_item, str) + strlen(name) + 1) + | |
1526 | policy_cnt * ALIGN8(offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access)); | |
1527 | ||
7f3d3ba1 | 1528 | hello = alloca0_align(size, 8); |
e821075a LP |
1529 | |
1530 | n = hello->items; | |
1531 | strcpy(n->str, name); | |
1532 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
613ec4b8 | 1533 | n->type = KDBUS_ITEM_NAME; |
1683342a DM |
1534 | n = KDBUS_ITEM_NEXT(n); |
1535 | ||
1536 | LIST_FOREACH(policy, po, policy) { | |
1537 | n->type = KDBUS_ITEM_POLICY_ACCESS; | |
1538 | n->size = offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access); | |
a4152e3f LP |
1539 | |
1540 | r = bus_kernel_translate_policy(po, n); | |
1541 | if (r < 0) | |
1542 | return r; | |
1543 | ||
1683342a DM |
1544 | n = KDBUS_ITEM_NEXT(n); |
1545 | } | |
e821075a | 1546 | |
a4152e3f LP |
1547 | if (world_policy >= 0) { |
1548 | n->type = KDBUS_ITEM_POLICY_ACCESS; | |
1549 | n->size = offsetof(struct kdbus_item, policy_access) + sizeof(struct kdbus_policy_access); | |
1550 | n->policy_access.type = KDBUS_POLICY_ACCESS_WORLD; | |
1551 | n->policy_access.access = bus_kernel_translate_access(world_policy); | |
1552 | } | |
1553 | ||
1683342a | 1554 | hello->size = size; |
bc75205c | 1555 | hello->flags = |
5892a914 DM |
1556 | (activating ? KDBUS_HELLO_ACTIVATOR : KDBUS_HELLO_POLICY_HOLDER) | |
1557 | (accept_fd ? KDBUS_HELLO_ACCEPT_FD : 0); | |
e821075a | 1558 | hello->pool_size = KDBUS_POOL_SIZE; |
d2e7b05f | 1559 | hello->attach_flags = _KDBUS_ATTACH_ALL; |
e821075a | 1560 | |
a4152e3f | 1561 | if (ioctl(fd, KDBUS_CMD_HELLO, hello) < 0) |
e821075a | 1562 | return -errno; |
e821075a | 1563 | |
4a3e79e1 | 1564 | /* The higher 32bit of the bus_flags fields are considered |
e821075a | 1565 | * 'incompatible flags'. Refuse them all for now. */ |
4a3e79e1 | 1566 | if (hello->bus_flags > 0xFFFFFFFFULL) |
e821075a | 1567 | return -ENOTSUP; |
e821075a | 1568 | |
a4152e3f | 1569 | if (!bloom_validate_parameters((size_t) hello->bloom.size, (unsigned) hello->bloom.n_hash)) |
e821075a | 1570 | return -ENOTSUP; |
e821075a LP |
1571 | |
1572 | return fd; | |
1573 | } | |
1574 | ||
486e99a3 | 1575 | int bus_kernel_create_domain(const char *name, char **s) { |
816a3f9e | 1576 | struct kdbus_cmd_make *make; |
9bd37b40 LP |
1577 | struct kdbus_item *n; |
1578 | int fd; | |
1579 | ||
1580 | assert(name); | |
1581 | assert(s); | |
1582 | ||
1583 | fd = open("/dev/kdbus/control", O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1584 | if (fd < 0) | |
1585 | return -errno; | |
1586 | ||
7f3d3ba1 DH |
1587 | make = alloca0_align(ALIGN8(offsetof(struct kdbus_cmd_make, items) + |
1588 | offsetof(struct kdbus_item, str) + | |
1589 | strlen(name) + 1), | |
1590 | 8); | |
9bd37b40 LP |
1591 | |
1592 | n = make->items; | |
1593 | strcpy(n->str, name); | |
1594 | n->size = offsetof(struct kdbus_item, str) + strlen(n->str) + 1; | |
5e16c257 | 1595 | n->type = KDBUS_ITEM_MAKE_NAME; |
9bd37b40 | 1596 | |
816a3f9e | 1597 | make->size = ALIGN8(offsetof(struct kdbus_cmd_make, items) + n->size); |
f7c7cd03 | 1598 | make->flags = KDBUS_MAKE_ACCESS_WORLD; |
9bd37b40 | 1599 | |
486e99a3 | 1600 | if (ioctl(fd, KDBUS_CMD_DOMAIN_MAKE, make) < 0) { |
03e334a1 | 1601 | safe_close(fd); |
9bd37b40 LP |
1602 | return -errno; |
1603 | } | |
1604 | ||
f9638db8 LP |
1605 | /* The higher 32bit of the flags field are considered |
1606 | * 'incompatible flags'. Refuse them all for now. */ | |
1607 | if (make->flags > 0xFFFFFFFFULL) { | |
03e334a1 | 1608 | safe_close(fd); |
f9638db8 LP |
1609 | return -ENOTSUP; |
1610 | } | |
1611 | ||
9bd37b40 LP |
1612 | if (s) { |
1613 | char *p; | |
1614 | ||
486e99a3 | 1615 | p = strappend("/dev/kdbus/domain/", name); |
9bd37b40 | 1616 | if (!p) { |
03e334a1 | 1617 | safe_close(fd); |
9bd37b40 LP |
1618 | return -ENOMEM; |
1619 | } | |
1620 | ||
1621 | *s = p; | |
1622 | } | |
1623 | ||
1624 | return fd; | |
1625 | } | |
c8fa3f60 | 1626 | |
ae095f86 LP |
1627 | int bus_kernel_try_close(sd_bus *bus) { |
1628 | assert(bus); | |
1629 | assert(bus->is_kernel); | |
1630 | ||
1631 | if (ioctl(bus->input_fd, KDBUS_CMD_BYEBYE) < 0) | |
1632 | return -errno; | |
1633 | ||
1634 | return 0; | |
1635 | } | |
ff975efb LP |
1636 | |
1637 | int bus_kernel_drop_one(int fd) { | |
1638 | struct kdbus_cmd_recv recv = { | |
1639 | .flags = KDBUS_RECV_DROP | |
1640 | }; | |
1641 | ||
1642 | assert(fd >= 0); | |
1643 | ||
1644 | if (ioctl(fd, KDBUS_CMD_MSG_RECV, &recv) < 0) | |
1645 | return -errno; | |
1646 | ||
1647 | return 0; | |
1648 | } |