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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 | ||
de1c301e LP |
107 | r = sd_bus_message_read(reply, "s", &s); |
108 | if (r < 0) | |
109 | return r; | |
110 | ||
dafb7591 LP |
111 | if (!service_name_is_valid(s) || s[0] != ':') |
112 | return -EBADMSG; | |
113 | ||
de1c301e LP |
114 | bus->unique_name = strdup(s); |
115 | if (!bus->unique_name) | |
116 | return -ENOMEM; | |
117 | ||
dafb7591 LP |
118 | bus->state = BUS_RUNNING; |
119 | ||
de1c301e LP |
120 | return 1; |
121 | } | |
122 | ||
123 | static int bus_send_hello(sd_bus *bus) { | |
124 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; | |
125 | int r; | |
126 | ||
127 | assert(bus); | |
128 | ||
129 | r = sd_bus_message_new_method_call( | |
130 | bus, | |
131 | "org.freedesktop.DBus", | |
132 | "/", | |
133 | "org.freedesktop.DBus", | |
134 | "Hello", | |
135 | &m); | |
136 | if (r < 0) | |
137 | return r; | |
138 | ||
e3017af9 | 139 | r = sd_bus_send_with_reply(bus, m, hello_callback, NULL, 0, NULL); |
de1c301e LP |
140 | if (r < 0) |
141 | return r; | |
142 | ||
89ffcd2a LP |
143 | bus->sent_hello = true; |
144 | return r; | |
de1c301e LP |
145 | } |
146 | ||
147 | static int bus_start_running(sd_bus *bus) { | |
de1c301e LP |
148 | assert(bus); |
149 | ||
89ffcd2a | 150 | if (bus->sent_hello) { |
de1c301e | 151 | bus->state = BUS_HELLO; |
e3017af9 | 152 | return 1; |
de1c301e LP |
153 | } |
154 | ||
155 | bus->state = BUS_RUNNING; | |
e3017af9 | 156 | return 1; |
de1c301e LP |
157 | } |
158 | ||
159 | static int parse_address_key(const char **p, const char *key, char **value) { | |
160 | size_t l, n = 0; | |
161 | const char *a; | |
162 | char *r = NULL; | |
163 | ||
164 | assert(p); | |
165 | assert(*p); | |
166 | assert(key); | |
167 | assert(value); | |
168 | ||
169 | l = strlen(key); | |
89ffcd2a | 170 | if (strncmp(*p, key, l) != 0) |
de1c301e LP |
171 | return 0; |
172 | ||
173 | if ((*p)[l] != '=') | |
174 | return 0; | |
175 | ||
176 | if (*value) | |
177 | return -EINVAL; | |
178 | ||
179 | a = *p + l + 1; | |
89ffcd2a | 180 | while (*a != ',' && *a != 0) { |
de1c301e LP |
181 | char c, *t; |
182 | ||
183 | if (*a == '%') { | |
184 | int x, y; | |
185 | ||
186 | x = unhexchar(a[1]); | |
187 | if (x < 0) { | |
188 | free(r); | |
189 | return x; | |
190 | } | |
191 | ||
192 | y = unhexchar(a[2]); | |
193 | if (y < 0) { | |
194 | free(r); | |
195 | return y; | |
196 | } | |
197 | ||
de1c301e | 198 | c = (char) ((x << 4) | y); |
89ffcd2a LP |
199 | a += 3; |
200 | } else { | |
de1c301e | 201 | c = *a; |
89ffcd2a LP |
202 | a++; |
203 | } | |
de1c301e | 204 | |
89ffcd2a | 205 | t = realloc(r, n + 2); |
de1c301e LP |
206 | if (!t) { |
207 | free(r); | |
208 | return -ENOMEM; | |
209 | } | |
210 | ||
211 | r = t; | |
212 | r[n++] = c; | |
213 | } | |
214 | ||
89ffcd2a LP |
215 | if (!r) { |
216 | r = strdup(""); | |
217 | if (!r) | |
218 | return -ENOMEM; | |
219 | } else | |
220 | r[n] = 0; | |
221 | ||
222 | if (*a == ',') | |
223 | a++; | |
224 | ||
de1c301e LP |
225 | *p = a; |
226 | *value = r; | |
227 | return 1; | |
228 | } | |
229 | ||
230 | static void skip_address_key(const char **p) { | |
231 | assert(p); | |
232 | assert(*p); | |
233 | ||
89ffcd2a LP |
234 | *p += strcspn(*p, ","); |
235 | ||
236 | if (**p == ',') | |
237 | (*p) ++; | |
de1c301e LP |
238 | } |
239 | ||
240 | static int bus_parse_next_address(sd_bus *b) { | |
241 | const char *a, *p; | |
242 | _cleanup_free_ char *guid = NULL; | |
243 | int r; | |
244 | ||
245 | assert(b); | |
246 | ||
247 | if (!b->address) | |
248 | return 0; | |
249 | if (b->address[b->address_index] == 0) | |
250 | return 0; | |
251 | ||
252 | a = b->address + b->address_index; | |
253 | ||
254 | zero(b->sockaddr); | |
255 | b->sockaddr_size = 0; | |
256 | b->peer = SD_ID128_NULL; | |
257 | ||
258 | if (startswith(a, "unix:")) { | |
259 | _cleanup_free_ char *path = NULL, *abstract = NULL; | |
260 | ||
261 | p = a + 5; | |
89ffcd2a | 262 | while (*p != 0) { |
de1c301e LP |
263 | r = parse_address_key(&p, "guid", &guid); |
264 | if (r < 0) | |
265 | return r; | |
266 | else if (r > 0) | |
267 | continue; | |
268 | ||
269 | r = parse_address_key(&p, "path", &path); | |
270 | if (r < 0) | |
271 | return r; | |
272 | else if (r > 0) | |
273 | continue; | |
274 | ||
275 | r = parse_address_key(&p, "abstract", &abstract); | |
276 | if (r < 0) | |
277 | return r; | |
278 | else if (r > 0) | |
279 | continue; | |
280 | ||
281 | skip_address_key(&p); | |
282 | } | |
283 | ||
284 | if (!path && !abstract) | |
285 | return -EINVAL; | |
286 | ||
287 | if (path && abstract) | |
288 | return -EINVAL; | |
289 | ||
290 | if (path) { | |
291 | size_t l; | |
292 | ||
293 | l = strlen(path); | |
294 | if (l > sizeof(b->sockaddr.un.sun_path)) | |
295 | return -E2BIG; | |
296 | ||
297 | b->sockaddr.un.sun_family = AF_UNIX; | |
298 | strncpy(b->sockaddr.un.sun_path, path, sizeof(b->sockaddr.un.sun_path)); | |
299 | b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l; | |
300 | } else if (abstract) { | |
301 | size_t l; | |
302 | ||
89ffcd2a | 303 | l = strlen(abstract); |
de1c301e LP |
304 | if (l > sizeof(b->sockaddr.un.sun_path) - 1) |
305 | return -E2BIG; | |
306 | ||
307 | b->sockaddr.un.sun_family = AF_UNIX; | |
308 | b->sockaddr.un.sun_path[0] = 0; | |
89ffcd2a | 309 | strncpy(b->sockaddr.un.sun_path+1, abstract, sizeof(b->sockaddr.un.sun_path)-1); |
de1c301e LP |
310 | b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + 1 + l; |
311 | } | |
312 | ||
313 | } else if (startswith(a, "tcp:")) { | |
314 | _cleanup_free_ char *host = NULL, *port = NULL, *family = NULL; | |
315 | struct addrinfo hints, *result; | |
316 | ||
317 | p = a + 4; | |
89ffcd2a | 318 | while (*p != 0) { |
de1c301e LP |
319 | r = parse_address_key(&p, "guid", &guid); |
320 | if (r < 0) | |
321 | return r; | |
322 | else if (r > 0) | |
323 | continue; | |
324 | ||
325 | r = parse_address_key(&p, "host", &host); | |
326 | if (r < 0) | |
327 | return r; | |
328 | else if (r > 0) | |
329 | continue; | |
330 | ||
331 | r = parse_address_key(&p, "port", &port); | |
332 | if (r < 0) | |
333 | return r; | |
334 | else if (r > 0) | |
335 | continue; | |
336 | ||
337 | r = parse_address_key(&p, "family", &family); | |
338 | if (r < 0) | |
339 | return r; | |
340 | else if (r > 0) | |
341 | continue; | |
342 | ||
343 | skip_address_key(&p); | |
344 | } | |
345 | ||
346 | if (!host || !port) | |
347 | return -EINVAL; | |
348 | ||
349 | zero(hints); | |
350 | hints.ai_socktype = SOCK_STREAM; | |
351 | hints.ai_flags = AI_ADDRCONFIG; | |
352 | ||
353 | if (family) { | |
354 | if (streq(family, "ipv4")) | |
355 | hints.ai_family = AF_INET; | |
356 | else if (streq(family, "ipv6")) | |
357 | hints.ai_family = AF_INET6; | |
358 | else | |
359 | return -EINVAL; | |
360 | } | |
361 | ||
362 | r = getaddrinfo(host, port, &hints, &result); | |
363 | if (r == EAI_SYSTEM) | |
364 | return -errno; | |
365 | else if (r != 0) | |
366 | return -EADDRNOTAVAIL; | |
367 | ||
368 | memcpy(&b->sockaddr, result->ai_addr, result->ai_addrlen); | |
369 | b->sockaddr_size = result->ai_addrlen; | |
370 | ||
371 | freeaddrinfo(result); | |
372 | } | |
373 | ||
374 | if (guid) { | |
375 | r = sd_id128_from_string(guid, &b->peer); | |
376 | if (r < 0) | |
377 | return r; | |
378 | } | |
379 | ||
380 | b->address_index = p - b->address; | |
381 | return 1; | |
382 | } | |
383 | ||
384 | static void iovec_advance(struct iovec *iov, unsigned *idx, size_t size) { | |
385 | ||
386 | while (size > 0) { | |
387 | struct iovec *i = iov + *idx; | |
388 | ||
389 | if (i->iov_len > size) { | |
390 | i->iov_base = (uint8_t*) i->iov_base + size; | |
391 | i->iov_len -= size; | |
392 | return; | |
393 | } | |
394 | ||
395 | size -= i->iov_len; | |
396 | ||
397 | i->iov_base = NULL; | |
398 | i->iov_len = 0; | |
399 | ||
400 | (*idx) ++; | |
401 | } | |
402 | } | |
403 | ||
404 | static int bus_write_auth(sd_bus *b) { | |
405 | struct msghdr mh; | |
406 | ssize_t k; | |
407 | ||
408 | assert(b); | |
409 | assert(b->state == BUS_AUTHENTICATING); | |
410 | ||
411 | if (b->auth_index >= ELEMENTSOF(b->auth_iovec)) | |
412 | return 0; | |
413 | ||
e3017af9 LP |
414 | if (b->auth_timeout == 0) |
415 | b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_DEFAULT_TIMEOUT; | |
416 | ||
de1c301e LP |
417 | zero(mh); |
418 | mh.msg_iov = b->auth_iovec + b->auth_index; | |
419 | mh.msg_iovlen = ELEMENTSOF(b->auth_iovec) - b->auth_index; | |
420 | ||
421 | k = sendmsg(b->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
422 | if (k < 0) | |
423 | return errno == EAGAIN ? 0 : -errno; | |
424 | ||
425 | iovec_advance(b->auth_iovec, &b->auth_index, (size_t) k); | |
426 | ||
427 | return 1; | |
428 | } | |
429 | ||
430 | static int bus_auth_verify(sd_bus *b) { | |
431 | char *e, *f; | |
432 | sd_id128_t peer; | |
433 | unsigned i; | |
434 | int r; | |
435 | ||
436 | /* We expect two response lines: "OK", "AGREE_UNIX_FD", and | |
437 | * that's it */ | |
438 | ||
439 | e = memmem(b->rbuffer, b->rbuffer_size, "\r\n", 2); | |
440 | if (!e) | |
441 | return 0; | |
442 | ||
89ffcd2a | 443 | f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2); |
de1c301e LP |
444 | if (!f) |
445 | return 0; | |
446 | ||
447 | if (e - (char*) b->rbuffer != 3 + 32) | |
448 | return -EPERM; | |
449 | ||
450 | if (memcmp(b->rbuffer, "OK ", 3)) | |
451 | return -EPERM; | |
452 | ||
453 | for (i = 0; i < 32; i += 2) { | |
454 | int x, y; | |
455 | ||
456 | x = unhexchar(((char*) b->rbuffer)[3 + i]); | |
89ffcd2a | 457 | y = unhexchar(((char*) b->rbuffer)[3 + i + 1]); |
de1c301e LP |
458 | |
459 | if (x < 0 || y < 0) | |
460 | return -EINVAL; | |
461 | ||
462 | peer.bytes[i/2] = ((uint8_t) x << 4 | (uint8_t) y); | |
463 | } | |
464 | ||
465 | if (!sd_id128_equal(b->peer, SD_ID128_NULL) && | |
466 | !sd_id128_equal(b->peer, peer)) | |
467 | return -EPERM; | |
468 | ||
469 | b->peer = peer; | |
470 | ||
471 | b->can_fds = | |
472 | (f - e == sizeof("\r\nAGREE_UNIX_FD") - 1) && | |
473 | memcmp(e + 2, "AGREE_UNIX_FD", sizeof("AGREE_UNIX_FD") - 1) == 0; | |
474 | ||
e3017af9 LP |
475 | b->rbuffer_size -= (f + 2 - (char*) b->rbuffer); |
476 | memmove(b->rbuffer, f + 2, b->rbuffer_size); | |
89ffcd2a | 477 | |
de1c301e LP |
478 | r = bus_start_running(b); |
479 | if (r < 0) | |
480 | return r; | |
481 | ||
482 | return 1; | |
483 | } | |
484 | ||
485 | static int bus_read_auth(sd_bus *b) { | |
486 | struct msghdr mh; | |
487 | struct iovec iov; | |
488 | size_t n; | |
489 | ssize_t k; | |
490 | int r; | |
89ffcd2a | 491 | void *p; |
de1c301e LP |
492 | |
493 | assert(b); | |
494 | ||
495 | r = bus_auth_verify(b); | |
496 | if (r != 0) | |
497 | return r; | |
498 | ||
499 | n = MAX(3 + 32 + 2 + sizeof("AGREE_UNIX_FD") - 1 + 2, b->rbuffer_size * 2); | |
25220239 LP |
500 | |
501 | if (n > BUS_AUTH_SIZE_MAX) | |
502 | n = BUS_AUTH_SIZE_MAX; | |
503 | ||
504 | if (b->rbuffer_size >= n) | |
505 | return -ENOBUFS; | |
506 | ||
89ffcd2a LP |
507 | p = realloc(b->rbuffer, n); |
508 | if (!p) | |
509 | return -ENOMEM; | |
510 | ||
511 | b->rbuffer = p; | |
de1c301e LP |
512 | |
513 | zero(iov); | |
514 | iov.iov_base = (uint8_t*) b->rbuffer + b->rbuffer_size; | |
515 | iov.iov_len = n - b->rbuffer_size; | |
516 | ||
517 | zero(mh); | |
518 | mh.msg_iov = &iov; | |
519 | mh.msg_iovlen = 1; | |
520 | ||
521 | k = recvmsg(b->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
522 | if (k < 0) | |
523 | return errno == EAGAIN ? 0 : -errno; | |
524 | ||
525 | b->rbuffer_size += k; | |
526 | ||
527 | r = bus_auth_verify(b); | |
528 | if (r != 0) | |
529 | return r; | |
530 | ||
e3017af9 | 531 | return 1; |
de1c301e LP |
532 | } |
533 | ||
534 | static int bus_start_auth(sd_bus *b) { | |
89ffcd2a | 535 | static const char auth_prefix[] = "\0AUTH EXTERNAL "; |
de1c301e LP |
536 | static const char auth_suffix[] = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n"; |
537 | ||
538 | char text[20 + 1]; /* enough space for a 64bit integer plus NUL */ | |
539 | size_t l; | |
540 | ||
541 | assert(b); | |
542 | ||
543 | b->state = BUS_AUTHENTICATING; | |
544 | ||
545 | snprintf(text, sizeof(text), "%llu", (unsigned long long) geteuid()); | |
546 | char_array_0(text); | |
547 | ||
548 | l = strlen(text); | |
549 | b->auth_uid = hexmem(text, l); | |
550 | if (!b->auth_uid) | |
551 | return -ENOMEM; | |
552 | ||
553 | b->auth_iovec[0].iov_base = (void*) auth_prefix; | |
554 | b->auth_iovec[0].iov_len = sizeof(auth_prefix) -1; | |
555 | b->auth_iovec[1].iov_base = (void*) b->auth_uid; | |
556 | b->auth_iovec[1].iov_len = l * 2; | |
557 | b->auth_iovec[2].iov_base = (void*) auth_suffix; | |
558 | b->auth_iovec[2].iov_len = sizeof(auth_suffix) -1; | |
559 | b->auth_size = sizeof(auth_prefix) - 1 + l * 2 + sizeof(auth_suffix) - 1; | |
560 | ||
561 | return bus_write_auth(b); | |
562 | } | |
563 | ||
564 | static int bus_start_connect(sd_bus *b) { | |
565 | int r; | |
566 | ||
567 | assert(b); | |
568 | assert(b->fd < 0); | |
569 | ||
570 | for (;;) { | |
571 | if (b->sockaddr.sa.sa_family == AF_UNSPEC) { | |
572 | r = bus_parse_next_address(b); | |
573 | if (r < 0) | |
574 | return r; | |
575 | if (r == 0) | |
e3017af9 | 576 | return b->last_connect_error ? -b->last_connect_error : -ECONNREFUSED; |
de1c301e LP |
577 | } |
578 | ||
579 | b->fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
580 | if (b->fd < 0) { | |
e3017af9 | 581 | b->last_connect_error = errno; |
de1c301e LP |
582 | zero(b->sockaddr); |
583 | continue; | |
584 | } | |
585 | ||
586 | r = connect(b->fd, &b->sockaddr.sa, b->sockaddr_size); | |
587 | if (r < 0) { | |
588 | if (errno == EINPROGRESS) | |
e3017af9 | 589 | return 1; |
de1c301e | 590 | |
e3017af9 | 591 | b->last_connect_error = errno; |
de1c301e LP |
592 | close_nointr_nofail(b->fd); |
593 | b->fd = -1; | |
594 | zero(b->sockaddr); | |
595 | continue; | |
596 | } | |
597 | ||
598 | return bus_start_auth(b); | |
599 | } | |
600 | } | |
601 | ||
602 | int sd_bus_open_system(sd_bus **ret) { | |
603 | const char *e; | |
604 | sd_bus *b; | |
605 | int r; | |
606 | ||
607 | if (!ret) | |
608 | return -EINVAL; | |
609 | ||
610 | e = getenv("DBUS_SYSTEM_BUS_ADDRESS"); | |
611 | if (e) { | |
612 | r = sd_bus_open_address(e, &b); | |
613 | if (r < 0) | |
614 | return r; | |
89ffcd2a LP |
615 | } else { |
616 | b = bus_new(); | |
617 | if (!b) | |
618 | return -ENOMEM; | |
de1c301e | 619 | |
89ffcd2a LP |
620 | b->sockaddr.un.sun_family = AF_UNIX; |
621 | strncpy(b->sockaddr.un.sun_path, "/run/dbus/system_bus_socket", sizeof(b->sockaddr.un.sun_path)); | |
622 | b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + sizeof("/run/dbus/system_bus_socket") - 1; | |
de1c301e | 623 | |
89ffcd2a LP |
624 | r = bus_start_connect(b); |
625 | if (r < 0) { | |
626 | bus_free(b); | |
627 | return r; | |
628 | } | |
629 | } | |
de1c301e | 630 | |
89ffcd2a | 631 | r = bus_send_hello(b); |
de1c301e | 632 | if (r < 0) { |
89ffcd2a | 633 | sd_bus_unref(b); |
de1c301e LP |
634 | return r; |
635 | } | |
636 | ||
637 | *ret = b; | |
638 | return 0; | |
639 | } | |
640 | ||
641 | int sd_bus_open_user(sd_bus **ret) { | |
642 | const char *e; | |
643 | sd_bus *b; | |
644 | size_t l; | |
645 | int r; | |
646 | ||
647 | if (!ret) | |
648 | return -EINVAL; | |
649 | ||
650 | e = getenv("DBUS_SESSION_BUS_ADDRESS"); | |
651 | if (e) { | |
652 | r = sd_bus_open_address(e, &b); | |
653 | if (r < 0) | |
654 | return r; | |
89ffcd2a LP |
655 | } else { |
656 | e = getenv("XDG_RUNTIME_DIR"); | |
657 | if (!e) | |
658 | return -ENOENT; | |
de1c301e | 659 | |
89ffcd2a LP |
660 | l = strlen(e); |
661 | if (l + 4 > sizeof(b->sockaddr.un.sun_path)) | |
662 | return -E2BIG; | |
de1c301e | 663 | |
89ffcd2a LP |
664 | b = bus_new(); |
665 | if (!b) | |
666 | return -ENOMEM; | |
de1c301e | 667 | |
89ffcd2a LP |
668 | b->sockaddr.un.sun_family = AF_UNIX; |
669 | memcpy(mempcpy(b->sockaddr.un.sun_path, e, l), "/bus", 4); | |
670 | b->sockaddr_size = offsetof(struct sockaddr_un, sun_path) + l + 4; | |
de1c301e | 671 | |
89ffcd2a LP |
672 | r = bus_start_connect(b); |
673 | if (r < 0) { | |
674 | bus_free(b); | |
675 | return r; | |
676 | } | |
677 | } | |
de1c301e | 678 | |
89ffcd2a | 679 | r = bus_send_hello(b); |
de1c301e | 680 | if (r < 0) { |
89ffcd2a | 681 | sd_bus_unref(b); |
de1c301e LP |
682 | return r; |
683 | } | |
684 | ||
685 | *ret = b; | |
686 | return 0; | |
687 | } | |
688 | ||
689 | int sd_bus_open_address(const char *address, sd_bus **ret) { | |
690 | sd_bus *b; | |
691 | int r; | |
692 | ||
693 | if (!address) | |
694 | return -EINVAL; | |
695 | if (!ret) | |
696 | return -EINVAL; | |
697 | ||
698 | b = bus_new(); | |
699 | if (!b) | |
700 | return -ENOMEM; | |
701 | ||
702 | b->address = strdup(address); | |
703 | if (!b->address) { | |
704 | bus_free(b); | |
705 | return -ENOMEM; | |
706 | } | |
707 | ||
708 | r = bus_start_connect(b); | |
709 | if (r < 0) { | |
710 | bus_free(b); | |
711 | return r; | |
712 | } | |
713 | ||
714 | *ret = b; | |
715 | return 0; | |
716 | } | |
717 | ||
718 | int sd_bus_open_fd(int fd, sd_bus **ret) { | |
719 | sd_bus *b; | |
720 | int r; | |
721 | ||
722 | if (fd < 0) | |
723 | return -EINVAL; | |
724 | if (!ret) | |
725 | return -EINVAL; | |
726 | ||
727 | b = bus_new(); | |
728 | if (!b) | |
729 | return -ENOMEM; | |
730 | ||
731 | b->fd = fd; | |
732 | fd_nonblock(b->fd, true); | |
733 | fd_cloexec(b->fd, true); | |
734 | ||
735 | r = bus_start_auth(b); | |
736 | if (r < 0) { | |
737 | bus_free(b); | |
738 | return r; | |
739 | } | |
740 | ||
741 | *ret = b; | |
742 | return 0; | |
743 | } | |
744 | ||
745 | void sd_bus_close(sd_bus *bus) { | |
746 | if (!bus) | |
747 | return; | |
748 | if (bus->fd < 0) | |
749 | return; | |
750 | ||
751 | close_nointr_nofail(bus->fd); | |
752 | bus->fd = -1; | |
753 | } | |
754 | ||
755 | sd_bus *sd_bus_ref(sd_bus *bus) { | |
756 | if (!bus) | |
757 | return NULL; | |
758 | ||
759 | assert(bus->n_ref > 0); | |
760 | ||
761 | bus->n_ref++; | |
762 | return bus; | |
763 | } | |
764 | ||
765 | sd_bus *sd_bus_unref(sd_bus *bus) { | |
766 | if (!bus) | |
767 | return NULL; | |
768 | ||
769 | assert(bus->n_ref > 0); | |
770 | bus->n_ref--; | |
771 | ||
772 | if (bus->n_ref <= 0) | |
773 | bus_free(bus); | |
774 | ||
775 | return NULL; | |
776 | } | |
777 | ||
e3017af9 LP |
778 | int sd_bus_is_open(sd_bus *bus) { |
779 | if (!bus) | |
780 | return -EINVAL; | |
781 | ||
782 | return bus->fd >= 0; | |
783 | } | |
784 | ||
d728d708 LP |
785 | int sd_bus_can_send(sd_bus *bus, char type) { |
786 | int r; | |
787 | ||
de1c301e LP |
788 | if (!bus) |
789 | return -EINVAL; | |
790 | ||
d728d708 LP |
791 | if (type == SD_BUS_TYPE_UNIX_FD) { |
792 | r = ensure_running(bus); | |
793 | if (r < 0) | |
794 | return r; | |
de1c301e | 795 | |
d728d708 LP |
796 | return bus->can_fds; |
797 | } | |
798 | ||
799 | return bus_type_is_valid(type); | |
de1c301e LP |
800 | } |
801 | ||
d728d708 LP |
802 | int sd_bus_get_peer(sd_bus *bus, sd_id128_t *peer) { |
803 | int r; | |
de1c301e LP |
804 | |
805 | if (!bus) | |
806 | return -EINVAL; | |
d728d708 LP |
807 | if (!peer) |
808 | return -EINVAL; | |
de1c301e | 809 | |
d728d708 LP |
810 | r = ensure_running(bus); |
811 | if (r < 0) | |
812 | return r; | |
de1c301e | 813 | |
d728d708 LP |
814 | *peer = bus->peer; |
815 | return 0; | |
de1c301e LP |
816 | } |
817 | ||
818 | static int bus_seal_message(sd_bus *b, sd_bus_message *m) { | |
819 | assert(m); | |
820 | ||
89ffcd2a LP |
821 | if (m->header->version > b->message_version) |
822 | return -EPERM; | |
823 | ||
de1c301e LP |
824 | if (m->sealed) |
825 | return 0; | |
826 | ||
9a17484d | 827 | return bus_message_seal(m, ++b->serial); |
de1c301e LP |
828 | } |
829 | ||
830 | static int message_write(sd_bus *bus, sd_bus_message *m, size_t *idx) { | |
831 | struct msghdr mh; | |
832 | struct iovec *iov; | |
833 | ssize_t k; | |
834 | size_t n; | |
835 | unsigned j; | |
836 | ||
837 | assert(bus); | |
838 | assert(m); | |
839 | assert(idx); | |
89ffcd2a | 840 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); |
de1c301e | 841 | |
e3017af9 LP |
842 | if (*idx >= m->size) |
843 | return 0; | |
844 | ||
de1c301e LP |
845 | n = m->n_iovec * sizeof(struct iovec); |
846 | iov = alloca(n); | |
847 | memcpy(iov, m->iovec, n); | |
848 | ||
849 | j = 0; | |
850 | iovec_advance(iov, &j, *idx); | |
851 | ||
852 | zero(mh); | |
853 | mh.msg_iov = iov; | |
854 | mh.msg_iovlen = m->n_iovec; | |
855 | ||
856 | k = sendmsg(bus->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
857 | if (k < 0) | |
e3017af9 | 858 | return errno == EAGAIN ? 0 : -errno; |
de1c301e LP |
859 | |
860 | *idx += (size_t) k; | |
e3017af9 | 861 | return 1; |
de1c301e LP |
862 | } |
863 | ||
864 | static int message_read_need(sd_bus *bus, size_t *need) { | |
865 | uint32_t a, b; | |
866 | uint8_t e; | |
25220239 | 867 | uint64_t sum; |
de1c301e LP |
868 | |
869 | assert(bus); | |
870 | assert(need); | |
89ffcd2a | 871 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); |
de1c301e | 872 | |
89ffcd2a | 873 | if (bus->rbuffer_size < sizeof(struct bus_header)) { |
e3017af9 LP |
874 | *need = sizeof(struct bus_header) + 8; |
875 | ||
876 | /* Minimum message size: | |
877 | * | |
878 | * Header + | |
879 | * | |
880 | * Method Call: +2 string headers | |
881 | * Signal: +3 string headers | |
882 | * Method Error: +1 string headers | |
883 | * +1 uint32 headers | |
884 | * Method Reply: +1 uint32 headers | |
885 | * | |
886 | * A string header is at least 9 bytes | |
887 | * A uint32 header is at least 8 bytes | |
888 | * | |
889 | * Hence the minimum message size of a valid message | |
890 | * is header + 8 bytes */ | |
891 | ||
de1c301e LP |
892 | return 0; |
893 | } | |
894 | ||
895 | a = ((const uint32_t*) bus->rbuffer)[1]; | |
896 | b = ((const uint32_t*) bus->rbuffer)[3]; | |
897 | ||
898 | e = ((const uint8_t*) bus->rbuffer)[0]; | |
899 | if (e == SD_BUS_LITTLE_ENDIAN) { | |
900 | a = le32toh(a); | |
901 | b = le32toh(b); | |
902 | } else if (e == SD_BUS_BIG_ENDIAN) { | |
903 | a = be32toh(a); | |
904 | b = be32toh(b); | |
905 | } else | |
89ffcd2a | 906 | return -EBADMSG; |
de1c301e | 907 | |
25220239 LP |
908 | sum = (uint64_t) sizeof(struct bus_header) + (uint64_t) ALIGN_TO(b, 8) + (uint64_t) a; |
909 | if (sum >= BUS_MESSAGE_SIZE_MAX) | |
910 | return -ENOBUFS; | |
911 | ||
912 | *need = (size_t) sum; | |
de1c301e LP |
913 | return 0; |
914 | } | |
915 | ||
916 | static int message_make(sd_bus *bus, size_t size, sd_bus_message **m) { | |
917 | sd_bus_message *t; | |
918 | void *b = NULL; | |
919 | int r; | |
920 | ||
921 | assert(bus); | |
922 | assert(m); | |
923 | assert(bus->rbuffer_size >= size); | |
89ffcd2a | 924 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); |
de1c301e | 925 | |
de1c301e LP |
926 | if (bus->rbuffer_size > size) { |
927 | b = memdup((const uint8_t*) bus->rbuffer + size, bus->rbuffer_size - size); | |
928 | if (!b) { | |
929 | free(t); | |
930 | return -ENOMEM; | |
931 | } | |
932 | } | |
933 | ||
80a46c73 LP |
934 | r = bus_message_from_malloc(bus->rbuffer, size, &t); |
935 | if (r < 0) { | |
936 | free(b); | |
937 | return r; | |
938 | } | |
de1c301e LP |
939 | |
940 | bus->rbuffer = b; | |
941 | bus->rbuffer_size -= size; | |
942 | ||
de1c301e LP |
943 | *m = t; |
944 | return 1; | |
945 | } | |
946 | ||
947 | static int message_read(sd_bus *bus, sd_bus_message **m) { | |
948 | struct msghdr mh; | |
949 | struct iovec iov; | |
950 | ssize_t k; | |
951 | size_t need; | |
952 | int r; | |
953 | void *b; | |
954 | ||
955 | assert(bus); | |
956 | assert(m); | |
89ffcd2a | 957 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); |
de1c301e LP |
958 | |
959 | r = message_read_need(bus, &need); | |
960 | if (r < 0) | |
961 | return r; | |
962 | ||
963 | if (bus->rbuffer_size >= need) | |
964 | return message_make(bus, need, m); | |
965 | ||
966 | b = realloc(bus->rbuffer, need); | |
967 | if (!b) | |
968 | return -ENOMEM; | |
969 | ||
89ffcd2a LP |
970 | bus->rbuffer = b; |
971 | ||
de1c301e LP |
972 | zero(iov); |
973 | iov.iov_base = (uint8_t*) bus->rbuffer + bus->rbuffer_size; | |
974 | iov.iov_len = need - bus->rbuffer_size; | |
975 | ||
976 | zero(mh); | |
977 | mh.msg_iov = &iov; | |
978 | mh.msg_iovlen = 1; | |
979 | ||
980 | k = recvmsg(bus->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
981 | if (k < 0) | |
982 | return errno == EAGAIN ? 0 : -errno; | |
983 | ||
984 | bus->rbuffer_size += k; | |
985 | ||
986 | r = message_read_need(bus, &need); | |
987 | if (r < 0) | |
988 | return r; | |
989 | ||
990 | if (bus->rbuffer_size >= need) | |
991 | return message_make(bus, need, m); | |
992 | ||
e3017af9 | 993 | return 1; |
de1c301e LP |
994 | } |
995 | ||
996 | static int dispatch_wqueue(sd_bus *bus) { | |
e3017af9 | 997 | int r, ret = 0; |
de1c301e LP |
998 | |
999 | assert(bus); | |
89ffcd2a | 1000 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); |
de1c301e LP |
1001 | |
1002 | if (bus->fd < 0) | |
1003 | return -ENOTCONN; | |
1004 | ||
1005 | while (bus->wqueue_size > 0) { | |
1006 | ||
1007 | r = message_write(bus, bus->wqueue[0], &bus->windex); | |
1008 | if (r < 0) { | |
1009 | sd_bus_close(bus); | |
1010 | return r; | |
1011 | } else if (r == 0) | |
e3017af9 LP |
1012 | /* Didn't do anything this time */ |
1013 | return ret; | |
1014 | else if (bus->windex >= bus->wqueue[0]->size) { | |
de1c301e LP |
1015 | /* Fully written. Let's drop the entry from |
1016 | * the queue. | |
1017 | * | |
1018 | * This isn't particularly optimized, but | |
1019 | * well, this is supposed to be our worst-case | |
1020 | * buffer only, and the socket buffer is | |
1021 | * supposed to be our primary buffer, and if | |
1022 | * it got full, then all bets are off | |
1023 | * anyway. */ | |
1024 | ||
1025 | sd_bus_message_unref(bus->wqueue[0]); | |
1026 | bus->wqueue_size --; | |
1027 | memmove(bus->wqueue, bus->wqueue + 1, sizeof(sd_bus_message*) * bus->wqueue_size); | |
1028 | bus->windex = 0; | |
1029 | ||
e3017af9 | 1030 | ret = 1; |
de1c301e LP |
1031 | } |
1032 | } | |
1033 | ||
e3017af9 | 1034 | return ret; |
de1c301e LP |
1035 | } |
1036 | ||
1037 | static int dispatch_rqueue(sd_bus *bus, sd_bus_message **m) { | |
2bf938c1 | 1038 | sd_bus_message *z = NULL; |
e3017af9 | 1039 | int r, ret = 0; |
de1c301e LP |
1040 | |
1041 | assert(bus); | |
1042 | assert(m); | |
89ffcd2a | 1043 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); |
de1c301e LP |
1044 | |
1045 | if (bus->fd < 0) | |
1046 | return -ENOTCONN; | |
1047 | ||
1048 | if (bus->rqueue_size > 0) { | |
1049 | /* Dispatch a queued message */ | |
1050 | ||
1051 | *m = bus->rqueue[0]; | |
1052 | bus->rqueue_size --; | |
1053 | memmove(bus->rqueue, bus->rqueue + 1, sizeof(sd_bus_message*) * bus->rqueue_size); | |
1054 | return 1; | |
1055 | } | |
1056 | ||
1057 | /* Try to read a new message */ | |
e3017af9 LP |
1058 | do { |
1059 | r = message_read(bus, &z); | |
1060 | if (r < 0) { | |
1061 | sd_bus_close(bus); | |
1062 | return r; | |
1063 | } | |
1064 | if (r == 0) | |
1065 | return ret; | |
de1c301e | 1066 | |
e3017af9 LP |
1067 | r = 1; |
1068 | } while (!z); | |
1069 | ||
1070 | *m = z; | |
1071 | return 1; | |
de1c301e LP |
1072 | } |
1073 | ||
1074 | int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *serial) { | |
1075 | int r; | |
1076 | ||
1077 | if (!bus) | |
1078 | return -EINVAL; | |
1079 | if (bus->fd < 0) | |
1080 | return -ENOTCONN; | |
1081 | if (!m) | |
1082 | return -EINVAL; | |
de1c301e | 1083 | |
29f6aadd LP |
1084 | /* If the serial number isn't kept, then we know that no reply |
1085 | * is expected */ | |
1086 | if (!serial && !m->sealed) | |
1087 | m->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED; | |
1088 | ||
de1c301e LP |
1089 | r = bus_seal_message(bus, m); |
1090 | if (r < 0) | |
1091 | return r; | |
1092 | ||
5407f2de LP |
1093 | /* If this is a reply and no reply was requested, then let's |
1094 | * suppress this, if we can */ | |
1095 | if (m->dont_send && !serial) | |
1096 | return 0; | |
1097 | ||
89ffcd2a | 1098 | if ((bus->state == BUS_RUNNING || bus->state == BUS_HELLO) && bus->wqueue_size <= 0) { |
de1c301e LP |
1099 | size_t idx = 0; |
1100 | ||
1101 | r = message_write(bus, m, &idx); | |
1102 | if (r < 0) { | |
1103 | sd_bus_close(bus); | |
1104 | return r; | |
e3017af9 | 1105 | } else if (idx < m->size) { |
de1c301e LP |
1106 | /* Wasn't fully written. So let's remember how |
1107 | * much was written. Note that the first entry | |
1108 | * of the wqueue array is always allocated so | |
1109 | * that we always can remember how much was | |
1110 | * written. */ | |
1111 | bus->wqueue[0] = sd_bus_message_ref(m); | |
1112 | bus->wqueue_size = 1; | |
1113 | bus->windex = idx; | |
1114 | } | |
1115 | } else { | |
1116 | sd_bus_message **q; | |
1117 | ||
1118 | /* Just append it to the queue. */ | |
1119 | ||
25220239 | 1120 | if (bus->wqueue_size >= BUS_WQUEUE_MAX) |
de1c301e LP |
1121 | return -ENOBUFS; |
1122 | ||
1123 | q = realloc(bus->wqueue, sizeof(sd_bus_message*) * (bus->wqueue_size + 1)); | |
1124 | if (!q) | |
1125 | return -ENOMEM; | |
1126 | ||
1127 | bus->wqueue = q; | |
1128 | q[bus->wqueue_size ++] = sd_bus_message_ref(m); | |
1129 | } | |
1130 | ||
1131 | if (serial) | |
1132 | *serial = BUS_MESSAGE_SERIAL(m); | |
1133 | ||
1134 | return 0; | |
1135 | } | |
1136 | ||
1137 | static usec_t calc_elapse(uint64_t usec) { | |
1138 | if (usec == (uint64_t) -1) | |
1139 | return 0; | |
1140 | ||
1141 | if (usec == 0) | |
e3017af9 | 1142 | usec = BUS_DEFAULT_TIMEOUT; |
de1c301e LP |
1143 | |
1144 | return now(CLOCK_MONOTONIC) + usec; | |
1145 | } | |
1146 | ||
e3017af9 LP |
1147 | static int timeout_compare(const void *a, const void *b) { |
1148 | const struct reply_callback *x = a, *y = b; | |
1149 | ||
1150 | if (x->timeout != 0 && y->timeout == 0) | |
1151 | return -1; | |
1152 | ||
1153 | if (x->timeout == 0 && y->timeout != 0) | |
1154 | return 1; | |
1155 | ||
1156 | if (x->timeout < y->timeout) | |
1157 | return -1; | |
1158 | ||
1159 | if (x->timeout > y->timeout) | |
1160 | return 1; | |
1161 | ||
1162 | return 0; | |
1163 | } | |
1164 | ||
de1c301e LP |
1165 | int sd_bus_send_with_reply( |
1166 | sd_bus *bus, | |
1167 | sd_bus_message *m, | |
1168 | sd_message_handler_t callback, | |
1169 | void *userdata, | |
1170 | uint64_t usec, | |
1171 | uint64_t *serial) { | |
1172 | ||
1173 | struct reply_callback *c; | |
1174 | int r; | |
1175 | ||
1176 | if (!bus) | |
1177 | return -EINVAL; | |
89ffcd2a | 1178 | if (bus->fd < 0) |
de1c301e LP |
1179 | return -ENOTCONN; |
1180 | if (!m) | |
1181 | return -EINVAL; | |
1182 | if (!callback) | |
1183 | return -EINVAL; | |
89ffcd2a | 1184 | if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) |
de1c301e | 1185 | return -EINVAL; |
89ffcd2a LP |
1186 | if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) |
1187 | return -EINVAL; | |
1188 | ||
1189 | r = hashmap_ensure_allocated(&bus->reply_callbacks, uint64_hash_func, uint64_compare_func); | |
1190 | if (r < 0) | |
1191 | return r; | |
de1c301e | 1192 | |
e3017af9 LP |
1193 | if (usec != (uint64_t) -1) { |
1194 | r = prioq_ensure_allocated(&bus->reply_callbacks_prioq, timeout_compare); | |
1195 | if (r < 0) | |
1196 | return r; | |
1197 | } | |
1198 | ||
de1c301e LP |
1199 | r = bus_seal_message(bus, m); |
1200 | if (r < 0) | |
1201 | return r; | |
1202 | ||
1203 | c = new(struct reply_callback, 1); | |
1204 | if (!c) | |
1205 | return -ENOMEM; | |
1206 | ||
1207 | c->callback = callback; | |
1208 | c->userdata = userdata; | |
1209 | c->serial = BUS_MESSAGE_SERIAL(m); | |
1210 | c->timeout = calc_elapse(usec); | |
1211 | ||
1212 | r = hashmap_put(bus->reply_callbacks, &c->serial, c); | |
1213 | if (r < 0) { | |
1214 | free(c); | |
1215 | return r; | |
1216 | } | |
1217 | ||
e3017af9 LP |
1218 | if (c->timeout != 0) { |
1219 | r = prioq_put(bus->reply_callbacks_prioq, c, &c->prioq_idx); | |
1220 | if (r < 0) { | |
1221 | c->timeout = 0; | |
1222 | sd_bus_send_with_reply_cancel(bus, c->serial); | |
1223 | return r; | |
1224 | } | |
1225 | } | |
1226 | ||
de1c301e LP |
1227 | r = sd_bus_send(bus, m, serial); |
1228 | if (r < 0) { | |
e3017af9 | 1229 | sd_bus_send_with_reply_cancel(bus, c->serial); |
de1c301e LP |
1230 | return r; |
1231 | } | |
1232 | ||
1233 | return r; | |
1234 | } | |
1235 | ||
1236 | int sd_bus_send_with_reply_cancel(sd_bus *bus, uint64_t serial) { | |
e3017af9 | 1237 | struct reply_callback *c; |
de1c301e LP |
1238 | |
1239 | if (!bus) | |
1240 | return -EINVAL; | |
1241 | if (serial == 0) | |
1242 | return -EINVAL; | |
1243 | ||
1244 | c = hashmap_remove(bus->reply_callbacks, &serial); | |
1245 | if (!c) | |
1246 | return 0; | |
1247 | ||
e3017af9 LP |
1248 | if (c->timeout != 0) |
1249 | prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx); | |
1250 | ||
de1c301e LP |
1251 | free(c); |
1252 | return 1; | |
1253 | } | |
1254 | ||
89ffcd2a LP |
1255 | static int ensure_running(sd_bus *bus) { |
1256 | int r; | |
1257 | ||
1258 | assert(bus); | |
1259 | ||
d728d708 LP |
1260 | if (bus->state == BUS_RUNNING) |
1261 | return 1; | |
89ffcd2a LP |
1262 | |
1263 | for (;;) { | |
1264 | r = sd_bus_process(bus, NULL); | |
1265 | if (r < 0) | |
1266 | return r; | |
d728d708 LP |
1267 | if (bus->state == BUS_RUNNING) |
1268 | return 1; | |
e3017af9 LP |
1269 | if (r > 0) |
1270 | continue; | |
89ffcd2a LP |
1271 | |
1272 | r = sd_bus_wait(bus, (uint64_t) -1); | |
1273 | if (r < 0) | |
1274 | return r; | |
1275 | } | |
1276 | } | |
1277 | ||
de1c301e LP |
1278 | int sd_bus_send_with_reply_and_block( |
1279 | sd_bus *bus, | |
1280 | sd_bus_message *m, | |
1281 | uint64_t usec, | |
1282 | sd_bus_error *error, | |
1283 | sd_bus_message **reply) { | |
1284 | ||
1285 | int r; | |
1286 | usec_t timeout; | |
1287 | uint64_t serial; | |
1288 | bool room = false; | |
1289 | ||
1290 | if (!bus) | |
1291 | return -EINVAL; | |
89ffcd2a | 1292 | if (bus->fd < 0) |
de1c301e LP |
1293 | return -ENOTCONN; |
1294 | if (!m) | |
1295 | return -EINVAL; | |
89ffcd2a | 1296 | if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) |
de1c301e | 1297 | return -EINVAL; |
89ffcd2a | 1298 | if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) |
de1c301e | 1299 | return -EINVAL; |
89ffcd2a LP |
1300 | if (bus_error_is_dirty(error)) |
1301 | return -EINVAL; | |
1302 | ||
1303 | r = ensure_running(bus); | |
1304 | if (r < 0) | |
1305 | return r; | |
de1c301e LP |
1306 | |
1307 | r = sd_bus_send(bus, m, &serial); | |
1308 | if (r < 0) | |
1309 | return r; | |
1310 | ||
1311 | timeout = calc_elapse(usec); | |
1312 | ||
1313 | for (;;) { | |
1314 | usec_t left; | |
e3017af9 | 1315 | sd_bus_message *incoming = NULL; |
de1c301e LP |
1316 | |
1317 | if (!room) { | |
1318 | sd_bus_message **q; | |
1319 | ||
25220239 LP |
1320 | if (bus->rqueue_size >= BUS_RQUEUE_MAX) |
1321 | return -ENOBUFS; | |
1322 | ||
de1c301e LP |
1323 | /* Make sure there's room for queuing this |
1324 | * locally, before we read the message */ | |
1325 | ||
1326 | q = realloc(bus->rqueue, (bus->rqueue_size + 1) * sizeof(sd_bus_message*)); | |
1327 | if (!q) | |
1328 | return -ENOMEM; | |
1329 | ||
1330 | bus->rqueue = q; | |
1331 | room = true; | |
1332 | } | |
1333 | ||
1334 | r = message_read(bus, &incoming); | |
1335 | if (r < 0) | |
1336 | return r; | |
e3017af9 | 1337 | if (incoming) { |
89ffcd2a | 1338 | |
de1c301e LP |
1339 | if (incoming->reply_serial == serial) { |
1340 | /* Found a match! */ | |
1341 | ||
1342 | if (incoming->header->type == SD_BUS_MESSAGE_TYPE_METHOD_RETURN) { | |
1343 | *reply = incoming; | |
1344 | return 0; | |
1345 | } | |
1346 | ||
1347 | if (incoming->header->type == SD_BUS_MESSAGE_TYPE_METHOD_ERROR) { | |
1348 | int k; | |
1349 | ||
1350 | r = sd_bus_error_copy(error, &incoming->error); | |
1351 | if (r < 0) { | |
1352 | sd_bus_message_unref(incoming); | |
1353 | return r; | |
1354 | } | |
1355 | ||
1356 | k = bus_error_to_errno(&incoming->error); | |
1357 | sd_bus_message_unref(incoming); | |
1358 | return k; | |
1359 | } | |
1360 | ||
1361 | sd_bus_message_unref(incoming); | |
1362 | return -EIO; | |
1363 | } | |
1364 | ||
1365 | /* There's already guaranteed to be room for | |
1366 | * this, so need to resize things here */ | |
1367 | bus->rqueue[bus->rqueue_size ++] = incoming; | |
1368 | room = false; | |
1369 | ||
1370 | /* Try to read more, right-away */ | |
1371 | continue; | |
1372 | } | |
e3017af9 LP |
1373 | if (r != 0) |
1374 | continue; | |
de1c301e LP |
1375 | |
1376 | if (timeout > 0) { | |
1377 | usec_t n; | |
1378 | ||
1379 | n = now(CLOCK_MONOTONIC); | |
1380 | if (n >= timeout) | |
1381 | return -ETIMEDOUT; | |
1382 | ||
1383 | left = timeout - n; | |
1384 | } else | |
1385 | left = (uint64_t) -1; | |
1386 | ||
e3017af9 | 1387 | r = bus_poll(bus, true, left); |
de1c301e LP |
1388 | if (r < 0) |
1389 | return r; | |
1390 | ||
1391 | r = dispatch_wqueue(bus); | |
1392 | if (r < 0) | |
1393 | return r; | |
1394 | } | |
1395 | } | |
1396 | ||
1397 | int sd_bus_get_fd(sd_bus *bus) { | |
1398 | if (!bus) | |
1399 | return -EINVAL; | |
1400 | ||
1401 | if (bus->fd < 0) | |
89ffcd2a | 1402 | return -ENOTCONN; |
de1c301e LP |
1403 | |
1404 | return bus->fd; | |
1405 | } | |
1406 | ||
1407 | int sd_bus_get_events(sd_bus *bus) { | |
1408 | int flags = 0; | |
1409 | ||
1410 | if (!bus) | |
1411 | return -EINVAL; | |
de1c301e | 1412 | if (bus->fd < 0) |
89ffcd2a | 1413 | return -ENOTCONN; |
de1c301e LP |
1414 | |
1415 | if (bus->state == BUS_OPENING) | |
1416 | flags |= POLLOUT; | |
89ffcd2a LP |
1417 | else if (bus->state == BUS_AUTHENTICATING) { |
1418 | ||
1419 | if (bus->auth_index < ELEMENTSOF(bus->auth_iovec)) | |
1420 | flags |= POLLOUT; | |
1421 | ||
1422 | flags |= POLLIN; | |
1423 | ||
1424 | } else if (bus->state == BUS_RUNNING || bus->state == BUS_HELLO) { | |
de1c301e LP |
1425 | if (bus->rqueue_size <= 0) |
1426 | flags |= POLLIN; | |
1427 | if (bus->wqueue_size > 0) | |
1428 | flags |= POLLOUT; | |
1429 | } | |
1430 | ||
1431 | return flags; | |
1432 | } | |
1433 | ||
e3017af9 LP |
1434 | int sd_bus_get_timeout(sd_bus *bus, uint64_t *timeout_usec) { |
1435 | struct reply_callback *c; | |
1436 | ||
1437 | if (!bus) | |
1438 | return -EINVAL; | |
1439 | if (!timeout_usec) | |
1440 | return -EINVAL; | |
1441 | if (bus->fd < 0) | |
1442 | return -ENOTCONN; | |
1443 | ||
1444 | if (bus->state == BUS_AUTHENTICATING) { | |
1445 | *timeout_usec = bus->auth_timeout; | |
1446 | return 1; | |
1447 | } | |
1448 | ||
1449 | if (bus->state != BUS_RUNNING && bus->state != BUS_HELLO) | |
1450 | return 0; | |
1451 | ||
1452 | c = prioq_peek(bus->reply_callbacks_prioq); | |
1453 | if (!c) | |
1454 | return 0; | |
1455 | ||
1456 | *timeout_usec = c->timeout; | |
1457 | return 1; | |
1458 | } | |
1459 | ||
1460 | static int process_timeout(sd_bus *bus) { | |
1461 | _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; | |
1462 | struct reply_callback *c; | |
1463 | usec_t n; | |
1464 | int r; | |
1465 | ||
1466 | assert(bus); | |
1467 | ||
1468 | c = prioq_peek(bus->reply_callbacks_prioq); | |
1469 | if (!c) | |
1470 | return 0; | |
1471 | ||
1472 | n = now(CLOCK_MONOTONIC); | |
1473 | if (c->timeout > n) | |
1474 | return 0; | |
1475 | ||
1476 | assert_se(prioq_pop(bus->reply_callbacks_prioq) == c); | |
1477 | hashmap_remove(bus->reply_callbacks, &c->serial); | |
1478 | ||
1479 | r = c->callback(bus, ETIMEDOUT, NULL, c->userdata); | |
1480 | free(c); | |
1481 | ||
1482 | return r < 0 ? r : 1; | |
1483 | } | |
1484 | ||
b9bf7e2b LP |
1485 | static int process_builtin(sd_bus *bus, sd_bus_message *m) { |
1486 | _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; | |
1487 | int r; | |
1488 | ||
1489 | assert(bus); | |
1490 | assert(m); | |
1491 | ||
1492 | if (m->header->type != SD_BUS_MESSAGE_TYPE_METHOD_CALL) | |
1493 | return 0; | |
1494 | ||
1495 | if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer")) | |
1496 | return 0; | |
1497 | ||
1498 | if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) | |
1499 | return 1; | |
1500 | ||
1501 | if (streq_ptr(m->member, "Ping")) | |
1502 | r = sd_bus_message_new_method_return(bus, m, &reply); | |
1503 | else if (streq_ptr(m->member, "GetMachineId")) { | |
1504 | sd_id128_t id; | |
1505 | char sid[33]; | |
1506 | ||
1507 | r = sd_id128_get_machine(&id); | |
1508 | if (r < 0) | |
1509 | return r; | |
1510 | ||
1511 | r = sd_bus_message_new_method_return(bus, m, &reply); | |
1512 | if (r < 0) | |
1513 | return r; | |
1514 | ||
1515 | r = sd_bus_message_append(reply, "s", sd_id128_to_string(id, sid)); | |
1516 | } else { | |
1517 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_INIT; | |
1518 | ||
1519 | sd_bus_error_set(&error, | |
1520 | "org.freedesktop.DBus.Error.UnknownMethod", | |
1521 | "Unknown method '%s' on interface '%s'.", m->member, m->interface); | |
1522 | ||
1523 | r = sd_bus_message_new_method_error(bus, m, &error, &reply); | |
1524 | } | |
1525 | ||
1526 | if (r < 0) | |
1527 | return r; | |
1528 | ||
1529 | r = sd_bus_send(bus, reply, NULL); | |
1530 | if (r < 0) | |
1531 | return r; | |
1532 | ||
1533 | return 1; | |
1534 | } | |
1535 | ||
e3017af9 LP |
1536 | static int process_message(sd_bus *bus, sd_bus_message *m) { |
1537 | struct filter_callback *l; | |
1538 | int r; | |
1539 | ||
1540 | assert(bus); | |
1541 | assert(m); | |
1542 | ||
b9bf7e2b | 1543 | if (m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_RETURN || m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_ERROR) { |
e3017af9 LP |
1544 | struct reply_callback *c; |
1545 | ||
1546 | c = hashmap_remove(bus->reply_callbacks, &m->reply_serial); | |
1547 | if (c) { | |
1548 | if (c->timeout != 0) | |
1549 | prioq_remove(bus->reply_callbacks_prioq, c, &c->prioq_idx); | |
1550 | ||
1551 | r = c->callback(bus, 0, m, c->userdata); | |
1552 | free(c); | |
1553 | ||
1554 | if (r != 0) | |
1555 | return r; | |
1556 | } | |
1557 | } | |
1558 | ||
1559 | LIST_FOREACH(callbacks, l, bus->filter_callbacks) { | |
1560 | r = l->callback(bus, 0, m, l->userdata); | |
1561 | if (r != 0) | |
1562 | return r; | |
1563 | } | |
1564 | ||
b9bf7e2b | 1565 | return process_builtin(bus, m); |
e3017af9 LP |
1566 | } |
1567 | ||
de1c301e | 1568 | int sd_bus_process(sd_bus *bus, sd_bus_message **ret) { |
de1c301e LP |
1569 | int r; |
1570 | ||
e3017af9 LP |
1571 | /* Returns 0 when we didn't do anything. This should cause the |
1572 | * caller to invoke sd_bus_wait() before returning the next | |
1573 | * time. Returns > 0 when we did something, which possibly | |
1574 | * means *ret is filled in with an unprocessed message. */ | |
1575 | ||
de1c301e LP |
1576 | if (!bus) |
1577 | return -EINVAL; | |
1578 | if (bus->fd < 0) | |
1579 | return -ENOTCONN; | |
1580 | ||
1581 | if (bus->state == BUS_OPENING) { | |
1582 | struct pollfd p; | |
1583 | ||
1584 | zero(p); | |
1585 | p.fd = bus->fd; | |
1586 | p.events = POLLOUT; | |
1587 | ||
1588 | r = poll(&p, 1, 0); | |
1589 | if (r < 0) | |
1590 | return -errno; | |
1591 | ||
1592 | if (p.revents & (POLLOUT|POLLERR|POLLHUP)) { | |
89ffcd2a | 1593 | int error = 0; |
de1c301e LP |
1594 | socklen_t slen = sizeof(error); |
1595 | ||
1596 | r = getsockopt(bus->fd, SOL_SOCKET, SO_ERROR, &error, &slen); | |
1597 | if (r < 0) | |
e3017af9 LP |
1598 | bus->last_connect_error = errno; |
1599 | else if (error != 0) | |
1600 | bus->last_connect_error = error; | |
de1c301e | 1601 | else if (p.revents & (POLLERR|POLLHUP)) |
e3017af9 LP |
1602 | bus->last_connect_error = ECONNREFUSED; |
1603 | else { | |
1604 | r = bus_start_auth(bus); | |
1605 | goto null_message; | |
1606 | } | |
de1c301e LP |
1607 | |
1608 | /* Try next address */ | |
e3017af9 LP |
1609 | r = bus_start_connect(bus); |
1610 | goto null_message; | |
de1c301e LP |
1611 | } |
1612 | ||
e3017af9 LP |
1613 | r = 0; |
1614 | goto null_message; | |
de1c301e LP |
1615 | |
1616 | } else if (bus->state == BUS_AUTHENTICATING) { | |
1617 | ||
e3017af9 LP |
1618 | if (now(CLOCK_MONOTONIC) >= bus->auth_timeout) |
1619 | return -ETIMEDOUT; | |
1620 | ||
de1c301e | 1621 | r = bus_write_auth(bus); |
e3017af9 LP |
1622 | if (r != 0) |
1623 | goto null_message; | |
de1c301e LP |
1624 | |
1625 | r = bus_read_auth(bus); | |
e3017af9 | 1626 | goto null_message; |
de1c301e LP |
1627 | |
1628 | } else if (bus->state == BUS_RUNNING || bus->state == BUS_HELLO) { | |
89ffcd2a | 1629 | _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
e3017af9 LP |
1630 | int k; |
1631 | ||
1632 | r = process_timeout(bus); | |
1633 | if (r != 0) | |
1634 | goto null_message; | |
de1c301e LP |
1635 | |
1636 | r = dispatch_wqueue(bus); | |
e3017af9 LP |
1637 | if (r != 0) |
1638 | goto null_message; | |
de1c301e | 1639 | |
e3017af9 | 1640 | k = r; |
de1c301e | 1641 | r = dispatch_rqueue(bus, &m); |
e3017af9 | 1642 | if (r < 0) |
de1c301e | 1643 | return r; |
e3017af9 LP |
1644 | if (!m) { |
1645 | if (r == 0) | |
1646 | r = k; | |
1647 | goto null_message; | |
de1c301e LP |
1648 | } |
1649 | ||
e3017af9 LP |
1650 | r = process_message(bus, m); |
1651 | if (r != 0) | |
1652 | goto null_message; | |
de1c301e LP |
1653 | |
1654 | if (ret) { | |
1655 | *ret = m; | |
89ffcd2a | 1656 | m = NULL; |
de1c301e LP |
1657 | return 1; |
1658 | } | |
1659 | ||
b9bf7e2b | 1660 | if (m->header->type == SD_BUS_MESSAGE_TYPE_METHOD_CALL) { |
89ffcd2a | 1661 | _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; |
b9bf7e2b LP |
1662 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_INIT; |
1663 | ||
1664 | sd_bus_error_set(&error, "org.freedesktop.DBus.Error.UnknownObject", "Unknown object '%s'.", m->path); | |
89ffcd2a | 1665 | |
b9bf7e2b | 1666 | r = sd_bus_message_new_method_error(bus, m, &error, &reply); |
89ffcd2a LP |
1667 | if (r < 0) |
1668 | return r; | |
1669 | ||
1670 | r = sd_bus_send(bus, reply, NULL); | |
1671 | if (r < 0) | |
1672 | return r; | |
1673 | } | |
1674 | ||
e3017af9 | 1675 | return 1; |
de1c301e LP |
1676 | } |
1677 | ||
89ffcd2a | 1678 | assert_not_reached("Unknown state"); |
e3017af9 LP |
1679 | |
1680 | null_message: | |
1681 | if (r >= 0 && ret) | |
1682 | *ret = NULL; | |
1683 | ||
1684 | return r; | |
de1c301e LP |
1685 | } |
1686 | ||
e3017af9 | 1687 | static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec) { |
de1c301e LP |
1688 | struct pollfd p; |
1689 | int r, e; | |
1690 | struct timespec ts; | |
e3017af9 LP |
1691 | usec_t until, m; |
1692 | ||
1693 | assert(bus); | |
de1c301e | 1694 | |
de1c301e | 1695 | if (bus->fd < 0) |
89ffcd2a LP |
1696 | return -ENOTCONN; |
1697 | ||
de1c301e LP |
1698 | e = sd_bus_get_events(bus); |
1699 | if (e < 0) | |
1700 | return e; | |
1701 | ||
e3017af9 LP |
1702 | if (need_more) |
1703 | e |= POLLIN; | |
1704 | ||
1705 | r = sd_bus_get_timeout(bus, &until); | |
1706 | if (r < 0) | |
1707 | return r; | |
1708 | if (r == 0) | |
1709 | m = (uint64_t) -1; | |
1710 | else { | |
1711 | usec_t n; | |
1712 | n = now(CLOCK_MONOTONIC); | |
1713 | m = until > n ? until - n : 0; | |
1714 | } | |
1715 | ||
1716 | if (timeout_usec != (uint64_t) -1 && (m == (uint64_t) -1 || timeout_usec < m)) | |
1717 | m = timeout_usec; | |
1718 | ||
de1c301e LP |
1719 | zero(p); |
1720 | p.fd = bus->fd; | |
1721 | p.events = e; | |
1722 | ||
e3017af9 | 1723 | r = ppoll(&p, 1, m == (uint64_t) -1 ? NULL : timespec_store(&ts, m), NULL); |
de1c301e | 1724 | if (r < 0) |
89ffcd2a | 1725 | return -errno; |
de1c301e | 1726 | |
e3017af9 LP |
1727 | return r > 0 ? 1 : 0; |
1728 | } | |
1729 | ||
1730 | int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec) { | |
1731 | ||
1732 | if (!bus) | |
1733 | return -EINVAL; | |
1734 | if (bus->fd < 0) | |
1735 | return -ENOTCONN; | |
1736 | if (bus->rqueue_size > 0) | |
1737 | return 0; | |
1738 | ||
1739 | return bus_poll(bus, false, timeout_usec); | |
de1c301e LP |
1740 | } |
1741 | ||
1742 | int sd_bus_flush(sd_bus *bus) { | |
1743 | int r; | |
1744 | ||
1745 | if (!bus) | |
1746 | return -EINVAL; | |
1747 | if (bus->fd < 0) | |
1748 | return -ENOTCONN; | |
1749 | ||
89ffcd2a LP |
1750 | r = ensure_running(bus); |
1751 | if (r < 0) | |
1752 | return r; | |
1753 | ||
1754 | if (bus->wqueue_size <= 0) | |
de1c301e LP |
1755 | return 0; |
1756 | ||
1757 | for (;;) { | |
1758 | r = dispatch_wqueue(bus); | |
1759 | if (r < 0) | |
1760 | return r; | |
1761 | ||
89ffcd2a | 1762 | if (bus->wqueue_size <= 0) |
de1c301e LP |
1763 | return 0; |
1764 | ||
e3017af9 | 1765 | r = bus_poll(bus, false, (uint64_t) -1); |
de1c301e LP |
1766 | if (r < 0) |
1767 | return r; | |
1768 | } | |
1769 | } | |
1770 | ||
1771 | int sd_bus_add_filter(sd_bus *bus, sd_message_handler_t callback, void *userdata) { | |
1772 | struct filter_callback *f; | |
1773 | ||
1774 | if (!bus) | |
1775 | return -EINVAL; | |
1776 | if (!callback) | |
1777 | return -EINVAL; | |
1778 | ||
1779 | f = new(struct filter_callback, 1); | |
1780 | if (!f) | |
1781 | return -ENOMEM; | |
1782 | f->callback = callback; | |
1783 | f->userdata = userdata; | |
1784 | ||
1785 | LIST_PREPEND(struct filter_callback, callbacks, bus->filter_callbacks, f); | |
1786 | return 0; | |
1787 | } | |
1788 | ||
1789 | int sd_bus_remove_filter(sd_bus *bus, sd_message_handler_t callback, void *userdata) { | |
1790 | struct filter_callback *f; | |
1791 | ||
1792 | if (!bus) | |
1793 | return -EINVAL; | |
1794 | if (!callback) | |
1795 | return -EINVAL; | |
1796 | ||
1797 | LIST_FOREACH(callbacks, f, bus->filter_callbacks) { | |
1798 | if (f->callback == callback && f->userdata == userdata) { | |
1799 | LIST_REMOVE(struct filter_callback, callbacks, bus->filter_callbacks, f); | |
1800 | free(f); | |
1801 | return 1; | |
1802 | } | |
1803 | } | |
1804 | ||
1805 | return 0; | |
1806 | } |