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de1c301e 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 | ||
22 | #include <endian.h> | |
23 | #include <assert.h> | |
24 | #include <stdlib.h> | |
25 | #include <unistd.h> | |
26 | #include <netdb.h> | |
27 | #include <sys/poll.h> | |
28 | #include <byteswap.h> | |
29 | ||
30 | #include "util.h" | |
31 | #include "macro.h" | |
32 | ||
33 | #include "sd-bus.h" | |
34 | #include "bus-internal.h" | |
35 | #include "bus-message.h" | |
36 | #include "bus-type.h" | |
37 | ||
d728d708 | 38 | static int ensure_running(sd_bus *bus); |
e3017af9 LP |
39 | static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec); |
40 | ||
de1c301e LP |
41 | static void bus_free(sd_bus *b) { |
42 | struct filter_callback *f; | |
89ffcd2a | 43 | unsigned i; |
de1c301e LP |
44 | |
45 | assert(b); | |
46 | ||
47 | if (b->fd >= 0) | |
48 | close_nointr_nofail(b->fd); | |
49 | ||
50 | free(b->rbuffer); | |
89ffcd2a LP |
51 | free(b->unique_name); |
52 | free(b->auth_uid); | |
53 | free(b->address); | |
54 | ||
55 | for (i = 0; i < b->rqueue_size; i++) | |
56 | sd_bus_message_unref(b->rqueue[i]); | |
de1c301e | 57 | free(b->rqueue); |
89ffcd2a LP |
58 | |
59 | for (i = 0; i < b->wqueue_size; i++) | |
60 | sd_bus_message_unref(b->wqueue[i]); | |
de1c301e | 61 | free(b->wqueue); |
de1c301e LP |
62 | |
63 | hashmap_free_free(b->reply_callbacks); | |
e3017af9 | 64 | prioq_free(b->reply_callbacks_prioq); |
de1c301e LP |
65 | |
66 | while ((f = b->filter_callbacks)) { | |
67 | LIST_REMOVE(struct filter_callback, callbacks, b->filter_callbacks, f); | |
68 | free(f); | |
69 | } | |
70 | ||
71 | free(b); | |
72 | } | |
73 | ||
74 | static sd_bus* bus_new(void) { | |
75 | sd_bus *r; | |
76 | ||
77 | r = new0(sd_bus, 1); | |
78 | if (!r) | |
79 | return NULL; | |
80 | ||
81 | r->n_ref = 1; | |
82 | r->fd = -1; | |
83 | r->message_version = 1; | |
84 | ||
85 | /* We guarantee that wqueue always has space for at least one | |
86 | * entry */ | |
87 | r->wqueue = new(sd_bus_message*, 1); | |
88 | if (!r->wqueue) { | |
89 | free(r); | |
90 | return NULL; | |
91 | } | |
92 | ||
93 | return r; | |
94 | }; | |
95 | ||
e3017af9 | 96 | static int hello_callback(sd_bus *bus, int error, sd_bus_message *reply, void *userdata) { |
de1c301e LP |
97 | const char *s; |
98 | int r; | |
99 | ||
100 | assert(bus); | |
e3017af9 LP |
101 | |
102 | if (error != 0) | |
103 | return -error; | |
104 | ||
de1c301e LP |
105 | assert(reply); |
106 | ||
107 | bus->state = BUS_RUNNING; | |
108 | ||
109 | r = sd_bus_message_read(reply, "s", &s); | |
110 | if (r < 0) | |
111 | return r; | |
112 | ||
113 | bus->unique_name = strdup(s); | |
114 | if (!bus->unique_name) | |
115 | return -ENOMEM; | |
116 | ||
117 | return 1; | |
118 | } | |
119 | ||
120 | static int bus_send_hello(sd_bus *bus) { | |
121 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; | |
122 | int r; | |
123 | ||
124 | assert(bus); | |
125 | ||
126 | r = sd_bus_message_new_method_call( | |
127 | bus, | |
128 | "org.freedesktop.DBus", | |
129 | "/", | |
130 | "org.freedesktop.DBus", | |
131 | "Hello", | |
132 | &m); | |
133 | if (r < 0) | |
134 | return r; | |
135 | ||
e3017af9 | 136 | r = sd_bus_send_with_reply(bus, m, hello_callback, NULL, 0, NULL); |
de1c301e LP |
137 | if (r < 0) |
138 | return r; | |
139 | ||
89ffcd2a LP |
140 | bus->sent_hello = true; |
141 | return r; | |
de1c301e LP |
142 | } |
143 | ||
144 | static int bus_start_running(sd_bus *bus) { | |
de1c301e LP |
145 | assert(bus); |
146 | ||
89ffcd2a | 147 | if (bus->sent_hello) { |
de1c301e | 148 | bus->state = BUS_HELLO; |
e3017af9 | 149 | return 1; |
de1c301e LP |
150 | } |
151 | ||
152 | bus->state = BUS_RUNNING; | |
e3017af9 | 153 | return 1; |
de1c301e LP |
154 | } |
155 | ||
156 | static int parse_address_key(const char **p, const char *key, char **value) { | |
157 | size_t l, n = 0; | |
158 | const char *a; | |
159 | char *r = NULL; | |
160 | ||
161 | assert(p); | |
162 | assert(*p); | |
163 | assert(key); | |
164 | assert(value); | |
165 | ||
166 | l = strlen(key); | |
89ffcd2a | 167 | if (strncmp(*p, key, l) != 0) |
de1c301e LP |
168 | return 0; |
169 | ||
170 | if ((*p)[l] != '=') | |
171 | return 0; | |
172 | ||
173 | if (*value) | |
174 | return -EINVAL; | |
175 | ||
176 | a = *p + l + 1; | |
89ffcd2a | 177 | while (*a != ',' && *a != 0) { |
de1c301e LP |
178 | char c, *t; |
179 | ||
180 | if (*a == '%') { | |
181 | int x, y; | |
182 | ||
183 | x = unhexchar(a[1]); | |
184 | if (x < 0) { | |
185 | free(r); | |
186 | return x; | |
187 | } | |
188 | ||
189 | y = unhexchar(a[2]); | |
190 | if (y < 0) { | |
191 | free(r); | |
192 | return y; | |
193 | } | |
194 | ||
de1c301e | 195 | c = (char) ((x << 4) | y); |
89ffcd2a LP |
196 | a += 3; |
197 | } else { | |
de1c301e | 198 | c = *a; |
89ffcd2a LP |
199 | a++; |
200 | } | |
de1c301e | 201 | |
89ffcd2a | 202 | t = realloc(r, n + 2); |
de1c301e LP |
203 | if (!t) { |
204 | free(r); | |
205 | return -ENOMEM; | |
206 | } | |
207 | ||
208 | r = t; | |
209 | r[n++] = c; | |
210 | } | |
211 | ||
89ffcd2a LP |
212 | if (!r) { |
213 | r = strdup(""); | |
214 | if (!r) | |
215 | return -ENOMEM; | |
216 | } else | |
217 | r[n] = 0; | |
218 | ||
219 | if (*a == ',') | |
220 | a++; | |
221 | ||
de1c301e LP |
222 | *p = a; |
223 | *value = r; | |
224 | return 1; | |
225 | } | |
226 | ||
227 | static void skip_address_key(const char **p) { | |
228 | assert(p); | |
229 | assert(*p); | |
230 | ||
89ffcd2a LP |
231 | *p += strcspn(*p, ","); |
232 | ||
233 | if (**p == ',') | |
234 | (*p) ++; | |
de1c301e LP |
235 | } |
236 | ||
237 | static int bus_parse_next_address(sd_bus *b) { | |
238 | const char *a, *p; | |
239 | _cleanup_free_ char *guid = NULL; | |
240 | int r; | |
241 | ||
242 | assert(b); | |
243 | ||
244 | if (!b->address) | |
245 | return 0; | |
246 | if (b->address[b->address_index] == 0) | |
247 | return 0; | |
248 | ||
249 | a = b->address + b->address_index; | |
250 | ||
251 | zero(b->sockaddr); | |
252 | b->sockaddr_size = 0; | |
253 | b->peer = SD_ID128_NULL; | |
254 | ||
255 | if (startswith(a, "unix:")) { | |
256 | _cleanup_free_ char *path = NULL, *abstract = NULL; | |
257 | ||
258 | p = a + 5; | |
89ffcd2a | 259 | while (*p != 0) { |
de1c301e LP |
260 | r = parse_address_key(&p, "guid", &guid); |
261 | if (r < 0) | |
262 | return r; | |
263 | else if (r > 0) | |
264 | continue; | |
265 | ||
266 | r = parse_address_key(&p, "path", &path); | |
267 | if (r < 0) | |
268 | return r; | |
269 | else if (r > 0) | |
270 | continue; | |
271 | ||
272 | r = parse_address_key(&p, "abstract", &abstract); | |
273 | if (r < 0) | |
274 | return r; | |
275 | else if (r > 0) | |
276 | continue; | |
277 | ||
278 | skip_address_key(&p); | |
279 | } | |
280 | ||
281 | if (!path && !abstract) | |
282 | return -EINVAL; | |
283 | ||
284 | if (path && abstract) | |
285 | return -EINVAL; | |
286 | ||
287 | if (path) { | |
288 | size_t l; | |
289 | ||
290 | l = strlen(path); | |
291 | if (l > sizeof(b->sockaddr.un.sun_path)) | |
292 | return -E2BIG; | |
293 | ||
294 | b->sockaddr.un.sun_family = AF_UNIX; | |
295 | strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path)); | |
296 | b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l; | |
297 | } else if (abstract) { | |
298 | size_t l; | |
299 | ||
89ffcd2a | 300 | l = strlen(abstract); |
de1c301e LP |
301 | if (l > sizeof(b->sockaddr.un.sun_path) - 1) |
302 | return -E2BIG; | |
303 | ||
304 | b->sockaddr.un.sun_family = AF_UNIX; | |
305 | b->sockaddr.un.sun_path[0] = 0; | |
89ffcd2a | 306 | strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1); |
de1c301e LP |
307 | b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l; |
308 | } | |
309 | ||
310 | } else if (startswith(a, "tcp:")) { | |
311 | _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL; | |
312 | struct addrinfo hints, *result; | |
313 | ||
314 | p = a + 4; | |
89ffcd2a | 315 | while (*p != 0) { |
de1c301e LP |
316 | r = parse_address_key(&p, "guid", &guid); |
317 | if (r < 0) | |
318 | return r; | |
319 | else if (r > 0) | |
320 | continue; | |
321 | ||
322 | r = parse_address_key(&p, "host", &host); | |
323 | if (r < 0) | |
324 | return r; | |
325 | else if (r > 0) | |
326 | continue; | |
327 | ||
328 | r = parse_address_key(&p, "port", &port); | |
329 | if (r < 0) | |
330 | return r; | |
331 | else if (r > 0) | |
332 | continue; | |
333 | ||
334 | r = parse_address_key(&p, "family", &family); | |
335 | if (r < 0) | |
336 | return r; | |
337 | else if (r > 0) | |
338 | continue; | |
339 | ||
340 | skip_address_key(&p); | |
341 | } | |
342 | ||
343 | if (!host || !port) | |
344 | return -EINVAL; | |
345 | ||
346 | zero(hints); | |
347 | hints.ai_socktype = SOCK_STREAM; | |
348 | hints.ai_flags = AI_ADDRCONFIG; | |
349 | ||
350 | if (family) { | |
351 | if (streq(family, "ipv4")) | |
352 | hints.ai_family = AF_INET; | |
353 | else if (streq(family, "ipv6")) | |
354 | hints.ai_family = AF_INET6; | |
355 | else | |
356 | return -EINVAL; | |
357 | } | |
358 | ||
359 | r = getaddrinfo(host, port, &hints, &result); | |
360 | if (r == EAI_SYSTEM) | |
361 | return -errno; | |
362 | else if (r != 0) | |
363 | return -EADDRNOTAVAIL; | |
364 | ||
365 | memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen); | |
366 | b->sockaddr_size = result->ai_addrlen; | |
367 | ||
368 | freeaddrinfo(result); | |
369 | } | |
370 | ||
371 | if (guid) { | |
372 | r = sd_id128_from_string(guid, &b->peer); | |
373 | if (r < 0) | |
374 | return r; | |
375 | } | |
376 | ||
377 | b->address_index = p - b->address; | |
378 | return 1; | |
379 | } | |
380 | ||
381 | static void iovec_advance(struct iovec *iov, unsigned *idx, size_t size) { | |
382 | ||
383 | while (size > 0) { | |
384 | struct iovec *i = iov + *idx; | |
385 | ||
386 | if (i->iov_len > size) { | |
387 | i->iov_base = (uint8_t*) i->iov_base + size; | |
388 | i->iov_len -= size; | |
389 | return; | |
390 | } | |
391 | ||
392 | size -= i->iov_len; | |
393 | ||
394 | i->iov_base = NULL; | |
395 | i->iov_len = 0; | |
396 | ||
397 | (*idx) ++; | |
398 | } | |
399 | } | |
400 | ||
401 | static int bus_write_auth(sd_bus *b) { | |
402 | struct msghdr mh; | |
403 | ssize_t k; | |
404 | ||
405 | assert(b); | |
406 | assert(b->state == BUS_AUTHENTICATING); | |
407 | ||
408 | if (b->auth_index >= ELEMENTSOF(b->auth_iovec)) | |
409 | return 0; | |
410 | ||
e3017af9 LP |
411 | if (b->auth_timeout == 0) |
412 | b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_DEFAULT_TIMEOUT; | |
413 | ||
de1c301e LP |
414 | zero(mh); |
415 | mh.msg_iov = b->auth_iovec + b->auth_index; | |
416 | mh.msg_iovlen = ELEMENTSOF(b->auth_iovec) - b->auth_index; | |
417 | ||
418 | k = sendmsg(b->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
419 | if (k < 0) | |
420 | return errno == EAGAIN ? 0 : -errno; | |
421 | ||
422 | iovec_advance(b->auth_iovec, &b->auth_index, (size_t) k); | |
423 | ||
424 | return 1; | |
425 | } | |
426 | ||
427 | static int bus_auth_verify(sd_bus *b) { | |
428 | char *e, *f; | |
429 | sd_id128_t peer; | |
430 | unsigned i; | |
431 | int r; | |
432 | ||
433 | /* We expect two response lines: "OK", "AGREE_UNIX_FD", and | |
434 | * that's it */ | |
435 | ||
436 | e = memmem(b->rbuffer, b->rbuffer_size, "\r\n", 2); | |
437 | if (!e) | |
438 | return 0; | |
439 | ||
89ffcd2a | 440 | f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2); |
de1c301e LP |
441 | if (!f) |
442 | return 0; | |
443 | ||
444 | if (e - (char*) b->rbuffer != 3 + 32) | |
445 | return -EPERM; | |
446 | ||
447 | if (memcmp(b->rbuffer, "OK ", 3)) | |
448 | return -EPERM; | |
449 | ||
450 | for (i = 0; i < 32; i += 2) { | |
451 | int x, y; | |
452 | ||
453 | x = unhexchar(((char*) b->rbuffer)[3 + i]); | |
89ffcd2a | 454 | y = unhexchar(((char*) b->rbuffer)[3 + i + 1]); |
de1c301e LP |
455 | |
456 | if (x < 0 || y < 0) | |
457 | return -EINVAL; | |
458 | ||
459 | peer.bytes[i/2] = ((uint8_t) x << 4 | (uint8_t) y); | |
460 | } | |
461 | ||
462 | if (!sd_id128_equal(b->peer, SD_ID128_NULL) && | |
463 | !sd_id128_equal(b->peer, peer)) | |
464 | return -EPERM; | |
465 | ||
466 | b->peer = peer; | |
467 | ||
468 | b->can_fds = | |
469 | (f - e == sizeof("\r\nAGREE_UNIX_FD") - 1) && | |
470 | memcmp(e + 2, "AGREE_UNIX_FD", sizeof("AGREE_UNIX_FD") - 1) == 0; | |
471 | ||
e3017af9 LP |
472 | b->rbuffer_size -= (f + 2 - (char*) b->rbuffer); |
473 | memmove(b->rbuffer, f + 2, b->rbuffer_size); | |
89ffcd2a | 474 | |
de1c301e LP |
475 | r = bus_start_running(b); |
476 | if (r < 0) | |
477 | return r; | |
478 | ||
479 | return 1; | |
480 | } | |
481 | ||
482 | static int bus_read_auth(sd_bus *b) { | |
483 | struct msghdr mh; | |
484 | struct iovec iov; | |
485 | size_t n; | |
486 | ssize_t k; | |
487 | int r; | |
89ffcd2a | 488 | void *p; |
de1c301e LP |
489 | |
490 | assert(b); | |
491 | ||
492 | r = bus_auth_verify(b); | |
493 | if (r != 0) | |
494 | return r; | |
495 | ||
496 | n = MAX(3 + 32 + 2 + sizeof("AGREE_UNIX_FD") - 1 + 2, b->rbuffer_size * 2); | |
25220239 LP |
497 | |
498 | if (n > BUS_AUTH_SIZE_MAX) | |
499 | n = BUS_AUTH_SIZE_MAX; | |
500 | ||
501 | if (b->rbuffer_size >= n) | |
502 | return -ENOBUFS; | |
503 | ||
89ffcd2a LP |
504 | p = realloc(b->rbuffer, n); |
505 | if (!p) | |
506 | return -ENOMEM; | |
507 | ||
508 | b->rbuffer = p; | |
de1c301e LP |
509 | |
510 | zero(iov); | |
511 | iov.iov_base = (uint8_t*) b->rbuffer + b->rbuffer_size; | |
512 | iov.iov_len = n - b->rbuffer_size; | |
513 | ||
514 | zero(mh); | |
515 | mh.msg_iov = &iov; | |
516 | mh.msg_iovlen = 1; | |
517 | ||
518 | k = recvmsg(b->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
519 | if (k < 0) | |
520 | return errno == EAGAIN ? 0 : -errno; | |
521 | ||
522 | b->rbuffer_size += k; | |
523 | ||
524 | r = bus_auth_verify(b); | |
525 | if (r != 0) | |
526 | return r; | |
527 | ||
e3017af9 | 528 | return 1; |
de1c301e LP |
529 | } |
530 | ||
531 | static int bus_start_auth(sd_bus *b) { | |
89ffcd2a | 532 | static const char auth_prefix[] = "\0AUTH EXTERNAL "; |
de1c301e LP |
533 | static const char auth_suffix[] = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n"; |
534 | ||
535 | char text[20 + 1]; /* enough space for a 64bit integer plus NUL */ | |
536 | size_t l; | |
537 | ||
538 | assert(b); | |
539 | ||
540 | b->state = BUS_AUTHENTICATING; | |
541 | ||
542 | snprintf(text, sizeof(text), "%llu", (unsigned long long) geteuid()); | |
543 | char_array_0(text); | |
544 | ||
545 | l = strlen(text); | |
546 | b->auth_uid = hexmem(text, l); | |
547 | if (!b->auth_uid) | |
548 | return -ENOMEM; | |
549 | ||
550 | b->auth_iovec[0].iov_base = (void*) auth_prefix; | |
551 | b->auth_iovec[0].iov_len = sizeof(auth_prefix) -1; | |
552 | b->auth_iovec[1].iov_base = (void*) b->auth_uid; | |
553 | b->auth_iovec[1].iov_len = l * 2; | |
554 | b->auth_iovec[2].iov_base = (void*) auth_suffix; | |
555 | b->auth_iovec[2].iov_len = sizeof(auth_suffix) -1; | |
556 | b->auth_size = sizeof(auth_prefix) - 1 + l * 2 + sizeof(auth_suffix) - 1; | |
557 | ||
558 | return bus_write_auth(b); | |
559 | } | |
560 | ||
561 | static int bus_start_connect(sd_bus *b) { | |
562 | int r; | |
563 | ||
564 | assert(b); | |
565 | assert(b->fd < 0); | |
566 | ||
567 | for (;;) { | |
568 | if (b->sockaddr.sa.sa_family == AF_UNSPEC) { | |
569 | r = bus_parse_next_address(b); | |
570 | if (r < 0) | |
571 | return r; | |
572 | if (r == 0) | |
e3017af9 | 573 | return b->last_connect_error ? -b->last_connect_error : -ECONNREFUSED; |
de1c301e LP |
574 | } |
575 | ||
576 | b->fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
577 | if (b->fd < 0) { | |
e3017af9 | 578 | b->last_connect_error = errno; |
de1c301e LP |
579 | zero(b->sockaddr); |
580 | continue; | |
581 | } | |
582 | ||
583 | r = connect(b->fd, &b->sockaddr.sa, b->sockaddr_size); | |
584 | if (r < 0) { | |
585 | if (errno == EINPROGRESS) | |
e3017af9 | 586 | return 1; |
de1c301e | 587 | |
e3017af9 | 588 | b->last_connect_error = errno; |
de1c301e LP |
589 | close_nointr_nofail(b->fd); |
590 | b->fd = -1; | |
591 | zero(b->sockaddr); | |
592 | continue; | |
593 | } | |
594 | ||
595 | return bus_start_auth(b); | |
596 | } | |
597 | } | |
598 | ||
599 | int sd_bus_open_system(sd_bus **ret) { | |
600 | const char *e; | |
601 | sd_bus *b; | |
602 | int r; | |
603 | ||
604 | if (!ret) | |
605 | return -EINVAL; | |
606 | ||
607 | e = getenv("DBUS_SYSTEM_BUS_ADDRESS"); | |
608 | if (e) { | |
609 | r = sd_bus_open_address(e, &b); | |
610 | if (r < 0) | |
611 | return r; | |
89ffcd2a LP |
612 | } else { |
613 | b = bus_new(); | |
614 | if (!b) | |
615 | return -ENOMEM; | |
de1c301e | 616 | |
89ffcd2a LP |
617 | b->sockaddr.un.sun_family = AF_UNIX; |
618 | strncpy(b->sockaddr.un.sun_path, "/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path)); | |
619 | b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + sizeof("/run/dbus/system_bus_socket") - 1; | |
de1c301e | 620 | |
89ffcd2a LP |
621 | r = bus_start_connect(b); |
622 | if (r < 0) { | |
623 | bus_free(b); | |
624 | return r; | |
625 | } | |
626 | } | |
de1c301e | 627 | |
89ffcd2a | 628 | r = bus_send_hello(b); |
de1c301e | 629 | if (r < 0) { |
89ffcd2a | 630 | sd_bus_unref(b); |
de1c301e LP |
631 | return r; |
632 | } | |
633 | ||
634 | *ret = b; | |
635 | return 0; | |
636 | } | |
637 | ||
638 | int sd_bus_open_user(sd_bus **ret) { | |
639 | const char *e; | |
640 | sd_bus *b; | |
641 | size_t l; | |
642 | int r; | |
643 | ||
644 | if (!ret) | |
645 | return -EINVAL; | |
646 | ||
647 | e = getenv("DBUS_SESSION_BUS_ADDRESS"); | |
648 | if (e) { | |
649 | r = sd_bus_open_address(e, &b); | |
650 | if (r < 0) | |
651 | return r; | |
89ffcd2a LP |
652 | } else { |
653 | e = getenv("XDG_RUNTIME_DIR"); | |
654 | if (!e) | |
655 | return -ENOENT; | |
de1c301e | 656 | |
89ffcd2a LP |
657 | l = strlen(e); |
658 | if (l + 4 > sizeof(b->sockaddr.un.sun_path)) | |
659 | return -E2BIG; | |
de1c301e | 660 | |
89ffcd2a LP |
661 | b = bus_new(); |
662 | if (!b) | |
663 | return -ENOMEM; | |
de1c301e | 664 | |
89ffcd2a LP |
665 | b->sockaddr.un.sun_family = AF_UNIX; |
666 | memcpy(mempcpy(b->sockaddr.un.sun_path, e, l), "/bus", 4); | |
667 | b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l + 4; | |
de1c301e | 668 | |
89ffcd2a LP |
669 | r = bus_start_connect(b); |
670 | if (r < 0) { | |
671 | bus_free(b); | |
672 | return r; | |
673 | } | |
674 | } | |
de1c301e | 675 | |
89ffcd2a | 676 | r = bus_send_hello(b); |
de1c301e | 677 | if (r < 0) { |
89ffcd2a | 678 | sd_bus_unref(b); |
de1c301e LP |
679 | return r; |
680 | } | |
681 | ||
682 | *ret = b; | |
683 | return 0; | |
684 | } | |
685 | ||
686 | int sd_bus_open_address(const char *address, sd_bus **ret) { | |
687 | sd_bus *b; | |
688 | int r; | |
689 | ||
690 | if (!address) | |
691 | return -EINVAL; | |
692 | if (!ret) | |
693 | return -EINVAL; | |
694 | ||
695 | b = bus_new(); | |
696 | if (!b) | |
697 | return -ENOMEM; | |
698 | ||
699 | b->address = strdup(address); | |
700 | if (!b->address) { | |
701 | bus_free(b); | |
702 | return -ENOMEM; | |
703 | } | |
704 | ||
705 | r = bus_start_connect(b); | |
706 | if (r < 0) { | |
707 | bus_free(b); | |
708 | return r; | |
709 | } | |
710 | ||
711 | *ret = b; | |
712 | return 0; | |
713 | } | |
714 | ||
715 | int sd_bus_open_fd(int fd, sd_bus **ret) { | |
716 | sd_bus *b; | |
717 | int r; | |
718 | ||
719 | if (fd < 0) | |
720 | return -EINVAL; | |
721 | if (!ret) | |
722 | return -EINVAL; | |
723 | ||
724 | b = bus_new(); | |
725 | if (!b) | |
726 | return -ENOMEM; | |
727 | ||
728 | b->fd = fd; | |
729 | fd_nonblock(b->fd, true); | |
730 | fd_cloexec(b->fd, true); | |
731 | ||
732 | r = bus_start_auth(b); | |
733 | if (r < 0) { | |
734 | bus_free(b); | |
735 | return r; | |
736 | } | |
737 | ||
738 | *ret = b; | |
739 | return 0; | |
740 | } | |
741 | ||
742 | void sd_bus_close(sd_bus *bus) { | |
743 | if (!bus) | |
744 | return; | |
745 | if (bus->fd < 0) | |
746 | return; | |
747 | ||
748 | close_nointr_nofail(bus->fd); | |
749 | bus->fd = -1; | |
750 | } | |
751 | ||
752 | sd_bus *sd_bus_ref(sd_bus *bus) { | |
753 | if (!bus) | |
754 | return NULL; | |
755 | ||
756 | assert(bus->n_ref > 0); | |
757 | ||
758 | bus->n_ref++; | |
759 | return bus; | |
760 | } | |
761 | ||
762 | sd_bus *sd_bus_unref(sd_bus *bus) { | |
763 | if (!bus) | |
764 | return NULL; | |
765 | ||
766 | assert(bus->n_ref > 0); | |
767 | bus->n_ref--; | |
768 | ||
769 | if (bus->n_ref <= 0) | |
770 | bus_free(bus); | |
771 | ||
772 | return NULL; | |
773 | } | |
774 | ||
e3017af9 LP |
775 | int sd_bus_is_open(sd_bus *bus) { |
776 | if (!bus) | |
777 | return -EINVAL; | |
778 | ||
779 | return bus->fd >= 0; | |
780 | } | |
781 | ||
d728d708 LP |
782 | int sd_bus_can_send(sd_bus *bus, char type) { |
783 | int r; | |
784 | ||
de1c301e LP |
785 | if (!bus) |
786 | return -EINVAL; | |
787 | ||
d728d708 LP |
788 | if (type == SD_BUS_TYPE_UNIX_FD) { |
789 | r = ensure_running(bus); | |
790 | if (r < 0) | |
791 | return r; | |
de1c301e | 792 | |
d728d708 LP |
793 | return bus->can_fds; |
794 | } | |
795 | ||
796 | return bus_type_is_valid(type); | |
de1c301e LP |
797 | } |
798 | ||
d728d708 LP |
799 | int sd_bus_get_peer(sd_bus *bus, sd_id128_t *peer) { |
800 | int r; | |
de1c301e LP |
801 | |
802 | if (!bus) | |
803 | return -EINVAL; | |
d728d708 LP |
804 | if (!peer) |
805 | return -EINVAL; | |
de1c301e | 806 | |
d728d708 LP |
807 | r = ensure_running(bus); |
808 | if (r < 0) | |
809 | return r; | |
de1c301e | 810 | |
d728d708 LP |
811 | *peer = bus->peer; |
812 | return 0; | |
de1c301e LP |
813 | } |
814 | ||
815 | static int bus_seal_message(sd_bus *b, sd_bus_message *m) { | |
816 | assert(m); | |
817 | ||
89ffcd2a LP |
818 | if (m->header->version > b->message_version) |
819 | return -EPERM; | |
820 | ||
de1c301e LP |
821 | if (m->sealed) |
822 | return 0; | |
823 | ||
9a17484d | 824 | return bus_message_seal(m, ++b->serial); |
de1c301e LP |
825 | } |
826 | ||
827 | static int message_write(sd_bus *bus, sd_bus_message *m, size_t *idx) { | |
828 | struct msghdr mh; | |
829 | struct iovec *iov; | |
830 | ssize_t k; | |
831 | size_t n; | |
832 | unsigned j; | |
833 | ||
834 | assert(bus); | |
835 | assert(m); | |
836 | assert(idx); | |
89ffcd2a | 837 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); |
de1c301e | 838 | |
e3017af9 LP |
839 | if (*idx >= m->size) |
840 | return 0; | |
841 | ||
de1c301e LP |
842 | n = m->n_iovec * sizeof(struct iovec); |
843 | iov = alloca(n); | |
844 | memcpy(iov, m->iovec, n); | |
845 | ||
846 | j = 0; | |
847 | iovec_advance(iov, &j, *idx); | |
848 | ||
849 | zero(mh); | |
850 | mh.msg_iov = iov; | |
851 | mh.msg_iovlen = m->n_iovec; | |
852 | ||
853 | k = sendmsg(bus->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
854 | if (k < 0) | |
e3017af9 | 855 | return errno == EAGAIN ? 0 : -errno; |
de1c301e LP |
856 | |
857 | *idx += (size_t) k; | |
e3017af9 | 858 | return 1; |
de1c301e LP |
859 | } |
860 | ||
861 | static int message_read_need(sd_bus *bus, size_t *need) { | |
862 | uint32_t a, b; | |
863 | uint8_t e; | |
25220239 | 864 | uint64_t sum; |
de1c301e LP |
865 | |
866 | assert(bus); | |
867 | assert(need); | |
89ffcd2a | 868 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); |
de1c301e | 869 | |
89ffcd2a | 870 | if (bus->rbuffer_size < sizeof(struct bus_header)) { |
e3017af9 LP |
871 | *need = sizeof(struct bus_header) + 8; |
872 | ||
873 | /* Minimum message size: | |
874 | * | |
875 | * Header + | |
876 | * | |
877 | * Method Call: +2 string headers | |
878 | * Signal: +3 string headers | |
879 | * Method Error: +1 string headers | |
880 | * +1 uint32 headers | |
881 | * Method Reply: +1 uint32 headers | |
882 | * | |
883 | * A string header is at least 9 bytes | |
884 | * A uint32 header is at least 8 bytes | |
885 | * | |
886 | * Hence the minimum message size of a valid message | |
887 | * is header + 8 bytes */ | |
888 | ||
de1c301e LP |
889 | return 0; |
890 | } | |
891 | ||
892 | a = ((const uint32_t*) bus->rbuffer)[1]; | |
893 | b = ((const uint32_t*) bus->rbuffer)[3]; | |
894 | ||
895 | e = ((const uint8_t*) bus->rbuffer)[0]; | |
896 | if (e == SD_BUS_LITTLE_ENDIAN) { | |
897 | a = le32toh(a); | |
898 | b = le32toh(b); | |
899 | } else if (e == SD_BUS_BIG_ENDIAN) { | |
900 | a = be32toh(a); | |
901 | b = be32toh(b); | |
902 | } else | |
89ffcd2a | 903 | return -EBADMSG; |
de1c301e | 904 | |
25220239 LP |
905 | sum = (uint64_t) sizeof(struct bus_header) + (uint64_t) ALIGN_TO(b, 8) + (uint64_t) a; |
906 | if (sum >= BUS_MESSAGE_SIZE_MAX) | |
907 | return -ENOBUFS; | |
908 | ||
909 | *need = (size_t) sum; | |
de1c301e LP |
910 | return 0; |
911 | } | |
912 | ||
913 | static int message_make(sd_bus *bus, size_t size, sd_bus_message **m) { | |
914 | sd_bus_message *t; | |
915 | void *b = NULL; | |
916 | int r; | |
917 | ||
918 | assert(bus); | |
919 | assert(m); | |
920 | assert(bus->rbuffer_size >= size); | |
89ffcd2a | 921 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); |
de1c301e | 922 | |
de1c301e LP |
923 | if (bus->rbuffer_size > size) { |
924 | b = memdup((const uint8_t*) bus->rbuffer + size, bus->rbuffer_size - size); | |
925 | if (!b) { | |
926 | free(t); | |
927 | return -ENOMEM; | |
928 | } | |
929 | } | |
930 | ||
80a46c73 LP |
931 | r = bus_message_from_malloc(bus->rbuffer, size, &t); |
932 | if (r < 0) { | |
933 | free(b); | |
934 | return r; | |
935 | } | |
de1c301e LP |
936 | |
937 | bus->rbuffer = b; | |
938 | bus->rbuffer_size -= size; | |
939 | ||
de1c301e LP |
940 | *m = t; |
941 | return 1; | |
942 | } | |
943 | ||
944 | static int message_read(sd_bus *bus, sd_bus_message **m) { | |
945 | struct msghdr mh; | |
946 | struct iovec iov; | |
947 | ssize_t k; | |
948 | size_t need; | |
949 | int r; | |
950 | void *b; | |
951 | ||
952 | assert(bus); | |
953 | assert(m); | |
89ffcd2a | 954 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); |
de1c301e LP |
955 | |
956 | r = message_read_need(bus, &need); | |
957 | if (r < 0) | |
958 | return r; | |
959 | ||
960 | if (bus->rbuffer_size >= need) | |
961 | return message_make(bus, need, m); | |
962 | ||
963 | b = realloc(bus->rbuffer, need); | |
964 | if (!b) | |
965 | return -ENOMEM; | |
966 | ||
89ffcd2a LP |
967 | bus->rbuffer = b; |
968 | ||
de1c301e LP |
969 | zero(iov); |
970 | iov.iov_base = (uint8_t*) bus->rbuffer + bus->rbuffer_size; | |
971 | iov.iov_len = need - bus->rbuffer_size; | |
972 | ||
973 | zero(mh); | |
974 | mh.msg_iov = &iov; | |
975 | mh.msg_iovlen = 1; | |
976 | ||
977 | k = recvmsg(bus->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
978 | if (k < 0) | |
979 | return errno == EAGAIN ? 0 : -errno; | |
980 | ||
981 | bus->rbuffer_size += k; | |
982 | ||
983 | r = message_read_need(bus, &need); | |
984 | if (r < 0) | |
985 | return r; | |
986 | ||
987 | if (bus->rbuffer_size >= need) | |
988 | return message_make(bus, need, m); | |
989 | ||
e3017af9 | 990 | return 1; |
de1c301e LP |
991 | } |
992 | ||
993 | static int dispatch_wqueue(sd_bus *bus) { | |
e3017af9 | 994 | int r, ret = 0; |
de1c301e LP |
995 | |
996 | assert(bus); | |
89ffcd2a | 997 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); |
de1c301e LP |
998 | |
999 | if (bus->fd < 0) | |
1000 | return -ENOTCONN; | |
1001 | ||
1002 | while (bus->wqueue_size > 0) { | |
1003 | ||
1004 | r = message_write(bus, bus->wqueue[0], &bus->windex); | |
1005 | if (r < 0) { | |
1006 | sd_bus_close(bus); | |
1007 | return r; | |
1008 | } else if (r == 0) | |
e3017af9 LP |
1009 | /* Didn't do anything this time */ |
1010 | return ret; | |
1011 | else if (bus->windex >= bus->wqueue[0]->size) { | |
de1c301e LP |
1012 | /* Fully written. Let's drop the entry from |
1013 | * the queue. | |
1014 | * | |
1015 | * This isn't particularly optimized, but | |
1016 | * well, this is supposed to be our worst-case | |
1017 | * buffer only, and the socket buffer is | |
1018 | * supposed to be our primary buffer, and if | |
1019 | * it got full, then all bets are off | |
1020 | * anyway. */ | |
1021 | ||
1022 | sd_bus_message_unref(bus->wqueue[0]); | |
1023 | bus->wqueue_size --; | |
1024 | memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size); | |
1025 | bus->windex = 0; | |
1026 | ||
e3017af9 | 1027 | ret = 1; |
de1c301e LP |
1028 | } |
1029 | } | |
1030 | ||
e3017af9 | 1031 | return ret; |
de1c301e LP |
1032 | } |
1033 | ||
1034 | static int dispatch_rqueue(sd_bus *bus, sd_bus_message **m) { | |
e3017af9 LP |
1035 | sd_bus_message *z; |
1036 | int r, ret = 0; | |
de1c301e LP |
1037 | |
1038 | assert(bus); | |
1039 | assert(m); | |
89ffcd2a | 1040 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); |
de1c301e LP |
1041 | |
1042 | if (bus->fd < 0) | |
1043 | return -ENOTCONN; | |
1044 | ||
1045 | if (bus->rqueue_size > 0) { | |
1046 | /* Dispatch a queued message */ | |
1047 | ||
1048 | *m = bus->rqueue[0]; | |
1049 | bus->rqueue_size --; | |
1050 | memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size); | |
1051 | return 1; | |
1052 | } | |
1053 | ||
1054 | /* Try to read a new message */ | |
e3017af9 LP |
1055 | do { |
1056 | r = message_read(bus, &z); | |
1057 | if (r < 0) { | |
1058 | sd_bus_close(bus); | |
1059 | return r; | |
1060 | } | |
1061 | if (r == 0) | |
1062 | return ret; | |
de1c301e | 1063 | |
e3017af9 LP |
1064 | r = 1; |
1065 | } while (!z); | |
1066 | ||
1067 | *m = z; | |
1068 | return 1; | |
de1c301e LP |
1069 | } |
1070 | ||
1071 | int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *serial) { | |
1072 | int r; | |
1073 | ||
1074 | if (!bus) | |
1075 | return -EINVAL; | |
1076 | if (bus->fd < 0) | |
1077 | return -ENOTCONN; | |
1078 | if (!m) | |
1079 | return -EINVAL; | |
de1c301e | 1080 | |
29f6aadd LP |
1081 | /* If the serial number isn't kept, then we know that no reply |
1082 | * is expected */ | |
1083 | if (!serial && !m->sealed) | |
1084 | m->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED; | |
1085 | ||
de1c301e LP |
1086 | r = bus_seal_message(bus, m); |
1087 | if (r < 0) | |
1088 | return r; | |
1089 | ||
5407f2de LP |
1090 | /* If this is a reply and no reply was requested, then let's |
1091 | * suppress this, if we can */ | |
1092 | if (m->dont_send && !serial) | |
1093 | return 0; | |
1094 | ||
89ffcd2a | 1095 | if ((bus->state == BUS_RUNNING || bus->state == BUS_HELLO) && bus->wqueue_size <= 0) { |
de1c301e LP |
1096 | size_t idx = 0; |
1097 | ||
1098 | r = message_write(bus, m, &idx); | |
1099 | if (r < 0) { | |
1100 | sd_bus_close(bus); | |
1101 | return r; | |
e3017af9 | 1102 | } else if (idx < m->size) { |
de1c301e LP |
1103 | /* Wasn't fully written. So let's remember how |
1104 | * much was written. Note that the first entry | |
1105 | * of the wqueue array is always allocated so | |
1106 | * that we always can remember how much was | |
1107 | * written. */ | |
1108 | bus->wqueue[0] = sd_bus_message_ref(m); | |
1109 | bus->wqueue_size = 1; | |
1110 | bus->windex = idx; | |
1111 | } | |
1112 | } else { | |
1113 | sd_bus_message **q; | |
1114 | ||
1115 | /* Just append it to the queue. */ | |
1116 | ||
25220239 | 1117 | if (bus->wqueue_size >= BUS_WQUEUE_MAX) |
de1c301e LP |
1118 | return -ENOBUFS; |
1119 | ||
1120 | q = realloc(bus->wqueue, sizeof(sd_bus_message*) * (bus->wqueue_size + 1)); | |
1121 | if (!q) | |
1122 | return -ENOMEM; | |
1123 | ||
1124 | bus->wqueue = q; | |
1125 | q[bus->wqueue_size ++] = sd_bus_message_ref(m); | |
1126 | } | |
1127 | ||
1128 | if (serial) | |
1129 | *serial = BUS_MESSAGE_SERIAL(m); | |
1130 | ||
1131 | return 0; | |
1132 | } | |
1133 | ||
1134 | static usec_t calc_elapse(uint64_t usec) { | |
1135 | if (usec == (uint64_t) -1) | |
1136 | return 0; | |
1137 | ||
1138 | if (usec == 0) | |
e3017af9 | 1139 | usec = BUS_DEFAULT_TIMEOUT; |
de1c301e LP |
1140 | |
1141 | return now(CLOCK_MONOTONIC) + usec; | |
1142 | } | |
1143 | ||
e3017af9 LP |
1144 | static int timeout_compare(const void *a, const void *b) { |
1145 | const struct reply_callback *x = a, *y = b; | |
1146 | ||
1147 | if (x->timeout != 0 && y->timeout == 0) | |
1148 | return -1; | |
1149 | ||
1150 | if (x->timeout == 0 && y->timeout != 0) | |
1151 | return 1; | |
1152 | ||
1153 | if (x->timeout < y->timeout) | |
1154 | return -1; | |
1155 | ||
1156 | if (x->timeout > y->timeout) | |
1157 | return 1; | |
1158 | ||
1159 | return 0; | |
1160 | } | |
1161 | ||
de1c301e LP |
1162 | int sd_bus_send_with_reply( |
1163 | sd_bus *bus, | |
1164 | sd_bus_message *m, | |
1165 | sd_message_handler_t callback, | |
1166 | void *userdata, | |
1167 | uint64_t usec, | |
1168 | uint64_t *serial) { | |
1169 | ||
1170 | struct reply_callback *c; | |
1171 | int r; | |
1172 | ||
1173 | if (!bus) | |
1174 | return -EINVAL; | |
89ffcd2a | 1175 | if (bus->fd < 0) |
de1c301e LP |
1176 | return -ENOTCONN; |
1177 | if (!m) | |
1178 | return -EINVAL; | |
1179 | if (!callback) | |
1180 | return -EINVAL; | |
89ffcd2a | 1181 | if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) |
de1c301e | 1182 | return -EINVAL; |
89ffcd2a LP |
1183 | if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) |
1184 | return -EINVAL; | |
1185 | ||
1186 | r = hashmap_ensure_allocated(&bus->reply_callbacks, uint64_hash_func, uint64_compare_func); | |
1187 | if (r < 0) | |
1188 | return r; | |
de1c301e | 1189 | |
e3017af9 LP |
1190 | if (usec != (uint64_t) -1) { |
1191 | r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare); | |
1192 | if (r < 0) | |
1193 | return r; | |
1194 | } | |
1195 | ||
de1c301e LP |
1196 | r = bus_seal_message(bus, m); |
1197 | if (r < 0) | |
1198 | return r; | |
1199 | ||
1200 | c = new(struct reply_callback, 1); | |
1201 | if (!c) | |
1202 | return -ENOMEM; | |
1203 | ||
1204 | c->callback = callback; | |
1205 | c->userdata = userdata; | |
1206 | c->serial = BUS_MESSAGE_SERIAL(m); | |
1207 | c->timeout = calc_elapse(usec); | |
1208 | ||
1209 | r = hashmap_put(bus->reply_callbacks, &c->serial, c); | |
1210 | if (r < 0) { | |
1211 | free(c); | |
1212 | return r; | |
1213 | } | |
1214 | ||
e3017af9 LP |
1215 | if (c->timeout != 0) { |
1216 | r = prioq_put(bus->reply_callbacks_prioq, c, &c->prioq_idx); | |
1217 | if (r < 0) { | |
1218 | c->timeout = 0; | |
1219 | sd_bus_send_with_reply_cancel(bus, c->serial); | |
1220 | return r; | |
1221 | } | |
1222 | } | |
1223 | ||
de1c301e LP |
1224 | r = sd_bus_send(bus, m, serial); |
1225 | if (r < 0) { | |
e3017af9 | 1226 | sd_bus_send_with_reply_cancel(bus, c->serial); |
de1c301e LP |
1227 | return r; |
1228 | } | |
1229 | ||
1230 | return r; | |
1231 | } | |
1232 | ||
1233 | int sd_bus_send_with_reply_cancel(sd_bus *bus, uint64_t serial) { | |
e3017af9 | 1234 | struct reply_callback *c; |
de1c301e LP |
1235 | |
1236 | if (!bus) | |
1237 | return -EINVAL; | |
1238 | if (serial == 0) | |
1239 | return -EINVAL; | |
1240 | ||
1241 | c = hashmap_remove(bus->reply_callbacks, &serial); | |
1242 | if (!c) | |
1243 | return 0; | |
1244 | ||
e3017af9 LP |
1245 | if (c->timeout != 0) |
1246 | prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx); | |
1247 | ||
de1c301e LP |
1248 | free(c); |
1249 | return 1; | |
1250 | } | |
1251 | ||
89ffcd2a LP |
1252 | static int ensure_running(sd_bus *bus) { |
1253 | int r; | |
1254 | ||
1255 | assert(bus); | |
1256 | ||
d728d708 LP |
1257 | if (bus->state == BUS_RUNNING) |
1258 | return 1; | |
89ffcd2a LP |
1259 | |
1260 | for (;;) { | |
1261 | r = sd_bus_process(bus, NULL); | |
1262 | if (r < 0) | |
1263 | return r; | |
d728d708 LP |
1264 | if (bus->state == BUS_RUNNING) |
1265 | return 1; | |
e3017af9 LP |
1266 | if (r > 0) |
1267 | continue; | |
89ffcd2a LP |
1268 | |
1269 | r = sd_bus_wait(bus, (uint64_t) -1); | |
1270 | if (r < 0) | |
1271 | return r; | |
1272 | } | |
1273 | } | |
1274 | ||
de1c301e LP |
1275 | int sd_bus_send_with_reply_and_block( |
1276 | sd_bus *bus, | |
1277 | sd_bus_message *m, | |
1278 | uint64_t usec, | |
1279 | sd_bus_error *error, | |
1280 | sd_bus_message **reply) { | |
1281 | ||
1282 | int r; | |
1283 | usec_t timeout; | |
1284 | uint64_t serial; | |
1285 | bool room = false; | |
1286 | ||
1287 | if (!bus) | |
1288 | return -EINVAL; | |
89ffcd2a | 1289 | if (bus->fd < 0) |
de1c301e LP |
1290 | return -ENOTCONN; |
1291 | if (!m) | |
1292 | return -EINVAL; | |
89ffcd2a | 1293 | if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) |
de1c301e | 1294 | return -EINVAL; |
89ffcd2a | 1295 | if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) |
de1c301e | 1296 | return -EINVAL; |
89ffcd2a LP |
1297 | if (bus_error_is_dirty(error)) |
1298 | return -EINVAL; | |
1299 | ||
1300 | r = ensure_running(bus); | |
1301 | if (r < 0) | |
1302 | return r; | |
de1c301e LP |
1303 | |
1304 | r = sd_bus_send(bus, m, &serial); | |
1305 | if (r < 0) | |
1306 | return r; | |
1307 | ||
1308 | timeout = calc_elapse(usec); | |
1309 | ||
1310 | for (;;) { | |
1311 | usec_t left; | |
e3017af9 | 1312 | sd_bus_message *incoming = NULL; |
de1c301e LP |
1313 | |
1314 | if (!room) { | |
1315 | sd_bus_message **q; | |
1316 | ||
25220239 LP |
1317 | if (bus->rqueue_size >= BUS_RQUEUE_MAX) |
1318 | return -ENOBUFS; | |
1319 | ||
de1c301e LP |
1320 | /* Make sure there's room for queuing this |
1321 | * locally, before we read the message */ | |
1322 | ||
1323 | q = realloc(bus->rqueue, (bus->rqueue_size + 1) * sizeof(sd_bus_message*)); | |
1324 | if (!q) | |
1325 | return -ENOMEM; | |
1326 | ||
1327 | bus->rqueue = q; | |
1328 | room = true; | |
1329 | } | |
1330 | ||
1331 | r = message_read(bus, &incoming); | |
1332 | if (r < 0) | |
1333 | return r; | |
e3017af9 | 1334 | if (incoming) { |
89ffcd2a | 1335 | |
de1c301e LP |
1336 | if (incoming->reply_serial == serial) { |
1337 | /* Found a match! */ | |
1338 | ||
1339 | if (incoming->header->type == SD_BUS_MESSAGE_TYPE_METHOD_RETURN) { | |
1340 | *reply = incoming; | |
1341 | return 0; | |
1342 | } | |
1343 | ||
1344 | if (incoming->header->type == SD_BUS_MESSAGE_TYPE_METHOD_ERROR) { | |
1345 | int k; | |
1346 | ||
1347 | r = sd_bus_error_copy(error, &incoming->error); | |
1348 | if (r < 0) { | |
1349 | sd_bus_message_unref(incoming); | |
1350 | return r; | |
1351 | } | |
1352 | ||
1353 | k = bus_error_to_errno(&incoming->error); | |
1354 | sd_bus_message_unref(incoming); | |
1355 | return k; | |
1356 | } | |
1357 | ||
1358 | sd_bus_message_unref(incoming); | |
1359 | return -EIO; | |
1360 | } | |
1361 | ||
1362 | /* There's already guaranteed to be room for | |
1363 | * this, so need to resize things here */ | |
1364 | bus->rqueue[bus->rqueue_size ++] = incoming; | |
1365 | room = false; | |
1366 | ||
1367 | /* Try to read more, right-away */ | |
1368 | continue; | |
1369 | } | |
e3017af9 LP |
1370 | if (r != 0) |
1371 | continue; | |
de1c301e LP |
1372 | |
1373 | if (timeout > 0) { | |
1374 | usec_t n; | |
1375 | ||
1376 | n = now(CLOCK_MONOTONIC); | |
1377 | if (n >= timeout) | |
1378 | return -ETIMEDOUT; | |
1379 | ||
1380 | left = timeout - n; | |
1381 | } else | |
1382 | left = (uint64_t) -1; | |
1383 | ||
e3017af9 | 1384 | r = bus_poll(bus, true, left); |
de1c301e LP |
1385 | if (r < 0) |
1386 | return r; | |
1387 | ||
1388 | r = dispatch_wqueue(bus); | |
1389 | if (r < 0) | |
1390 | return r; | |
1391 | } | |
1392 | } | |
1393 | ||
1394 | int sd_bus_get_fd(sd_bus *bus) { | |
1395 | if (!bus) | |
1396 | return -EINVAL; | |
1397 | ||
1398 | if (bus->fd < 0) | |
89ffcd2a | 1399 | return -ENOTCONN; |
de1c301e LP |
1400 | |
1401 | return bus->fd; | |
1402 | } | |
1403 | ||
1404 | int sd_bus_get_events(sd_bus *bus) { | |
1405 | int flags = 0; | |
1406 | ||
1407 | if (!bus) | |
1408 | return -EINVAL; | |
de1c301e | 1409 | if (bus->fd < 0) |
89ffcd2a | 1410 | return -ENOTCONN; |
de1c301e LP |
1411 | |
1412 | if (bus->state == BUS_OPENING) | |
1413 | flags |= POLLOUT; | |
89ffcd2a LP |
1414 | else if (bus->state == BUS_AUTHENTICATING) { |
1415 | ||
1416 | if (bus->auth_index < ELEMENTSOF(bus->auth_iovec)) | |
1417 | flags |= POLLOUT; | |
1418 | ||
1419 | flags |= POLLIN; | |
1420 | ||
1421 | } else if (bus->state == BUS_RUNNING || bus->state == BUS_HELLO) { | |
de1c301e LP |
1422 | if (bus->rqueue_size <= 0) |
1423 | flags |= POLLIN; | |
1424 | if (bus->wqueue_size > 0) | |
1425 | flags |= POLLOUT; | |
1426 | } | |
1427 | ||
1428 | return flags; | |
1429 | } | |
1430 | ||
e3017af9 LP |
1431 | int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) { |
1432 | struct reply_callback *c; | |
1433 | ||
1434 | if (!bus) | |
1435 | return -EINVAL; | |
1436 | if (!timeout_usec) | |
1437 | return -EINVAL; | |
1438 | if (bus->fd < 0) | |
1439 | return -ENOTCONN; | |
1440 | ||
1441 | if (bus->state == BUS_AUTHENTICATING) { | |
1442 | *timeout_usec = bus->auth_timeout; | |
1443 | return 1; | |
1444 | } | |
1445 | ||
1446 | if (bus->state != BUS_RUNNING && bus->state != BUS_HELLO) | |
1447 | return 0; | |
1448 | ||
1449 | c = prioq_peek(bus->reply_callbacks_prioq); | |
1450 | if (!c) | |
1451 | return 0; | |
1452 | ||
1453 | *timeout_usec = c->timeout; | |
1454 | return 1; | |
1455 | } | |
1456 | ||
1457 | static int process_timeout(sd_bus *bus) { | |
1458 | _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; | |
1459 | struct reply_callback *c; | |
1460 | usec_t n; | |
1461 | int r; | |
1462 | ||
1463 | assert(bus); | |
1464 | ||
1465 | c = prioq_peek(bus->reply_callbacks_prioq); | |
1466 | if (!c) | |
1467 | return 0; | |
1468 | ||
1469 | n = now(CLOCK_MONOTONIC); | |
1470 | if (c->timeout > n) | |
1471 | return 0; | |
1472 | ||
1473 | assert_se(prioq_pop(bus->reply_callbacks_prioq) == c); | |
1474 | hashmap_remove(bus->reply_callbacks, &c->serial); | |
1475 | ||
1476 | r = c->callback(bus, ETIMEDOUT, NULL, c->userdata); | |
1477 | free(c); | |
1478 | ||
1479 | return r < 0 ? r : 1; | |
1480 | } | |
1481 | ||
b9bf7e2b LP |
1482 | static int process_builtin(sd_bus *bus, sd_bus_message *m) { |
1483 | _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; | |
1484 | int r; | |
1485 | ||
1486 | assert(bus); | |
1487 | assert(m); | |
1488 | ||
1489 | if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) | |
1490 | return 0; | |
1491 | ||
1492 | if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer")) | |
1493 | return 0; | |
1494 | ||
1495 | if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) | |
1496 | return 1; | |
1497 | ||
1498 | if (streq_ptr(m->member, "Ping")) | |
1499 | r = sd_bus_message_new_method_return(bus, m, &reply); | |
1500 | else if (streq_ptr(m->member, "GetMachineId")) { | |
1501 | sd_id128_t id; | |
1502 | char sid[33]; | |
1503 | ||
1504 | r = sd_id128_get_machine(&id); | |
1505 | if (r < 0) | |
1506 | return r; | |
1507 | ||
1508 | r = sd_bus_message_new_method_return(bus, m, &reply); | |
1509 | if (r < 0) | |
1510 | return r; | |
1511 | ||
1512 | r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid)); | |
1513 | } else { | |
1514 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_INIT; | |
1515 | ||
1516 | sd_bus_error_set(&error, | |
1517 | "org.freedesktop.DBus.Error.UnknownMethod", | |
1518 | "Unknown method '%s' on interface '%s'.", m->member, m->interface); | |
1519 | ||
1520 | r = sd_bus_message_new_method_error(bus, m, &error, &reply); | |
1521 | } | |
1522 | ||
1523 | if (r < 0) | |
1524 | return r; | |
1525 | ||
1526 | r = sd_bus_send(bus, reply, NULL); | |
1527 | if (r < 0) | |
1528 | return r; | |
1529 | ||
1530 | return 1; | |
1531 | } | |
1532 | ||
e3017af9 LP |
1533 | static int process_message(sd_bus *bus, sd_bus_message *m) { |
1534 | struct filter_callback *l; | |
1535 | int r; | |
1536 | ||
1537 | assert(bus); | |
1538 | assert(m); | |
1539 | ||
b9bf7e2b | 1540 | if (m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_RETURN || m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_ERROR) { |
e3017af9 LP |
1541 | struct reply_callback *c; |
1542 | ||
1543 | c = hashmap_remove(bus->reply_callbacks, &m->reply_serial); | |
1544 | if (c) { | |
1545 | if (c->timeout != 0) | |
1546 | prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx); | |
1547 | ||
1548 | r = c->callback(bus, 0, m, c->userdata); | |
1549 | free(c); | |
1550 | ||
1551 | if (r != 0) | |
1552 | return r; | |
1553 | } | |
1554 | } | |
1555 | ||
1556 | LIST_FOREACH(callbacks, l, bus->filter_callbacks) { | |
1557 | r = l->callback(bus, 0, m, l->userdata); | |
1558 | if (r != 0) | |
1559 | return r; | |
1560 | } | |
1561 | ||
b9bf7e2b | 1562 | return process_builtin(bus, m); |
e3017af9 LP |
1563 | } |
1564 | ||
de1c301e | 1565 | int sd_bus_process(sd_bus *bus, sd_bus_message **ret) { |
de1c301e LP |
1566 | int r; |
1567 | ||
e3017af9 LP |
1568 | /* Returns 0 when we didn't do anything. This should cause the |
1569 | * caller to invoke sd_bus_wait() before returning the next | |
1570 | * time. Returns > 0 when we did something, which possibly | |
1571 | * means *ret is filled in with an unprocessed message. */ | |
1572 | ||
de1c301e LP |
1573 | if (!bus) |
1574 | return -EINVAL; | |
1575 | if (bus->fd < 0) | |
1576 | return -ENOTCONN; | |
1577 | ||
1578 | if (bus->state == BUS_OPENING) { | |
1579 | struct pollfd p; | |
1580 | ||
1581 | zero(p); | |
1582 | p.fd = bus->fd; | |
1583 | p.events = POLLOUT; | |
1584 | ||
1585 | r = poll(&p, 1, 0); | |
1586 | if (r < 0) | |
1587 | return -errno; | |
1588 | ||
1589 | if (p.revents & (POLLOUT|POLLERR|POLLHUP)) { | |
89ffcd2a | 1590 | int error = 0; |
de1c301e LP |
1591 | socklen_t slen = sizeof(error); |
1592 | ||
1593 | r = getsockopt(bus->fd, SOL_SOCKET, SO_ERROR, &error, &slen); | |
1594 | if (r < 0) | |
e3017af9 LP |
1595 | bus->last_connect_error = errno; |
1596 | else if (error != 0) | |
1597 | bus->last_connect_error = error; | |
de1c301e | 1598 | else if (p.revents & (POLLERR|POLLHUP)) |
e3017af9 LP |
1599 | bus->last_connect_error = ECONNREFUSED; |
1600 | else { | |
1601 | r = bus_start_auth(bus); | |
1602 | goto null_message; | |
1603 | } | |
de1c301e LP |
1604 | |
1605 | /* Try next address */ | |
e3017af9 LP |
1606 | r = bus_start_connect(bus); |
1607 | goto null_message; | |
de1c301e LP |
1608 | } |
1609 | ||
e3017af9 LP |
1610 | r = 0; |
1611 | goto null_message; | |
de1c301e LP |
1612 | |
1613 | } else if (bus->state == BUS_AUTHENTICATING) { | |
1614 | ||
e3017af9 LP |
1615 | if (now(CLOCK_MONOTONIC) >= bus->auth_timeout) |
1616 | return -ETIMEDOUT; | |
1617 | ||
de1c301e | 1618 | r = bus_write_auth(bus); |
e3017af9 LP |
1619 | if (r != 0) |
1620 | goto null_message; | |
de1c301e LP |
1621 | |
1622 | r = bus_read_auth(bus); | |
e3017af9 | 1623 | goto null_message; |
de1c301e LP |
1624 | |
1625 | } else if (bus->state == BUS_RUNNING || bus->state == BUS_HELLO) { | |
89ffcd2a | 1626 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
e3017af9 LP |
1627 | int k; |
1628 | ||
1629 | r = process_timeout(bus); | |
1630 | if (r != 0) | |
1631 | goto null_message; | |
de1c301e LP |
1632 | |
1633 | r = dispatch_wqueue(bus); | |
e3017af9 LP |
1634 | if (r != 0) |
1635 | goto null_message; | |
de1c301e | 1636 | |
e3017af9 | 1637 | k = r; |
de1c301e | 1638 | r = dispatch_rqueue(bus, &m); |
e3017af9 | 1639 | if (r < 0) |
de1c301e | 1640 | return r; |
e3017af9 LP |
1641 | if (!m) { |
1642 | if (r == 0) | |
1643 | r = k; | |
1644 | goto null_message; | |
de1c301e LP |
1645 | } |
1646 | ||
e3017af9 LP |
1647 | r = process_message(bus, m); |
1648 | if (r != 0) | |
1649 | goto null_message; | |
de1c301e LP |
1650 | |
1651 | if (ret) { | |
1652 | *ret = m; | |
89ffcd2a | 1653 | m = NULL; |
de1c301e LP |
1654 | return 1; |
1655 | } | |
1656 | ||
b9bf7e2b | 1657 | if (m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_CALL) { |
89ffcd2a | 1658 | _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; |
b9bf7e2b LP |
1659 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_INIT; |
1660 | ||
1661 | sd_bus_error_set(&error, "org.freedesktop.DBus.Error.UnknownObject", "Unknown object '%s'.", m->path); | |
89ffcd2a | 1662 | |
b9bf7e2b | 1663 | r = sd_bus_message_new_method_error(bus, m, &error, &reply); |
89ffcd2a LP |
1664 | if (r < 0) |
1665 | return r; | |
1666 | ||
1667 | r = sd_bus_send(bus, reply, NULL); | |
1668 | if (r < 0) | |
1669 | return r; | |
1670 | } | |
1671 | ||
e3017af9 | 1672 | return 1; |
de1c301e LP |
1673 | } |
1674 | ||
89ffcd2a | 1675 | assert_not_reached("Unknown state"); |
e3017af9 LP |
1676 | |
1677 | null_message: | |
1678 | if (r >= 0 && ret) | |
1679 | *ret = NULL; | |
1680 | ||
1681 | return r; | |
de1c301e LP |
1682 | } |
1683 | ||
e3017af9 | 1684 | static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) { |
de1c301e LP |
1685 | struct pollfd p; |
1686 | int r, e; | |
1687 | struct timespec ts; | |
e3017af9 LP |
1688 | usec_t until, m; |
1689 | ||
1690 | assert(bus); | |
de1c301e | 1691 | |
de1c301e | 1692 | if (bus->fd < 0) |
89ffcd2a LP |
1693 | return -ENOTCONN; |
1694 | ||
de1c301e LP |
1695 | e = sd_bus_get_events(bus); |
1696 | if (e < 0) | |
1697 | return e; | |
1698 | ||
e3017af9 LP |
1699 | if (need_more) |
1700 | e |= POLLIN; | |
1701 | ||
1702 | r = sd_bus_get_timeout(bus, &until); | |
1703 | if (r < 0) | |
1704 | return r; | |
1705 | if (r == 0) | |
1706 | m = (uint64_t) -1; | |
1707 | else { | |
1708 | usec_t n; | |
1709 | n = now(CLOCK_MONOTONIC); | |
1710 | m = until > n ? until - n : 0; | |
1711 | } | |
1712 | ||
1713 | if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m)) | |
1714 | m = timeout_usec; | |
1715 | ||
de1c301e LP |
1716 | zero(p); |
1717 | p.fd = bus->fd; | |
1718 | p.events = e; | |
1719 | ||
e3017af9 | 1720 | r = ppoll(&p, 1, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL); |
de1c301e | 1721 | if (r < 0) |
89ffcd2a | 1722 | return -errno; |
de1c301e | 1723 | |
e3017af9 LP |
1724 | return r > 0 ? 1 : 0; |
1725 | } | |
1726 | ||
1727 | int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) { | |
1728 | ||
1729 | if (!bus) | |
1730 | return -EINVAL; | |
1731 | if (bus->fd < 0) | |
1732 | return -ENOTCONN; | |
1733 | if (bus->rqueue_size > 0) | |
1734 | return 0; | |
1735 | ||
1736 | return bus_poll(bus, false, timeout_usec); | |
de1c301e LP |
1737 | } |
1738 | ||
1739 | int sd_bus_flush(sd_bus *bus) { | |
1740 | int r; | |
1741 | ||
1742 | if (!bus) | |
1743 | return -EINVAL; | |
1744 | if (bus->fd < 0) | |
1745 | return -ENOTCONN; | |
1746 | ||
89ffcd2a LP |
1747 | r = ensure_running(bus); |
1748 | if (r < 0) | |
1749 | return r; | |
1750 | ||
1751 | if (bus->wqueue_size <= 0) | |
de1c301e LP |
1752 | return 0; |
1753 | ||
1754 | for (;;) { | |
1755 | r = dispatch_wqueue(bus); | |
1756 | if (r < 0) | |
1757 | return r; | |
1758 | ||
89ffcd2a | 1759 | if (bus->wqueue_size <= 0) |
de1c301e LP |
1760 | return 0; |
1761 | ||
e3017af9 | 1762 | r = bus_poll(bus, false, (uint64_t) -1); |
de1c301e LP |
1763 | if (r < 0) |
1764 | return r; | |
1765 | } | |
1766 | } | |
1767 | ||
1768 | int sd_bus_add_filter(sd_bus *bus, sd_message_handler_t callback, void *userdata) { | |
1769 | struct filter_callback *f; | |
1770 | ||
1771 | if (!bus) | |
1772 | return -EINVAL; | |
1773 | if (!callback) | |
1774 | return -EINVAL; | |
1775 | ||
1776 | f = new(struct filter_callback, 1); | |
1777 | if (!f) | |
1778 | return -ENOMEM; | |
1779 | f->callback = callback; | |
1780 | f->userdata = userdata; | |
1781 | ||
1782 | LIST_PREPEND(struct filter_callback, callbacks, bus->filter_callbacks, f); | |
1783 | return 0; | |
1784 | } | |
1785 | ||
1786 | int sd_bus_remove_filter(sd_bus *bus, sd_message_handler_t callback, void *userdata) { | |
1787 | struct filter_callback *f; | |
1788 | ||
1789 | if (!bus) | |
1790 | return -EINVAL; | |
1791 | if (!callback) | |
1792 | return -EINVAL; | |
1793 | ||
1794 | LIST_FOREACH(callbacks, f, bus->filter_callbacks) { | |
1795 | if (f->callback == callback && f->userdata == userdata) { | |
1796 | LIST_REMOVE(struct filter_callback, callbacks, bus->filter_callbacks, f); | |
1797 | free(f); | |
1798 | return 1; | |
1799 | } | |
1800 | } | |
1801 | ||
1802 | return 0; | |
1803 | } |