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a7e3212d 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 <sys/poll.h> | |
27 | #include <byteswap.h> | |
28 | ||
29 | #include "util.h" | |
30 | #include "macro.h" | |
31 | #include "missing.h" | |
32 | #include "strv.h" | |
33 | ||
34 | #include "sd-bus.h" | |
35 | #include "bus-socket.h" | |
36 | #include "bus-internal.h" | |
37 | #include "bus-message.h" | |
38 | ||
39 | static void iovec_advance(struct iovec *iov, unsigned *idx, size_t size) { | |
40 | ||
41 | while (size > 0) { | |
42 | struct iovec *i = iov + *idx; | |
43 | ||
44 | if (i->iov_len > size) { | |
45 | i->iov_base = (uint8_t*) i->iov_base + size; | |
46 | i->iov_len -= size; | |
47 | return; | |
48 | } | |
49 | ||
50 | size -= i->iov_len; | |
51 | ||
52 | i->iov_base = NULL; | |
53 | i->iov_len = 0; | |
54 | ||
55 | (*idx) ++; | |
56 | } | |
57 | } | |
58 | ||
59 | static int bus_socket_write_auth(sd_bus *b) { | |
60 | struct msghdr mh; | |
61 | ssize_t k; | |
62 | ||
63 | assert(b); | |
64 | assert(b->state == BUS_AUTHENTICATING); | |
65 | ||
66 | if (b->auth_index >= ELEMENTSOF(b->auth_iovec)) | |
67 | return 0; | |
68 | ||
69 | if (b->auth_timeout == 0) | |
70 | b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_DEFAULT_TIMEOUT; | |
71 | ||
72 | zero(mh); | |
73 | mh.msg_iov = b->auth_iovec + b->auth_index; | |
74 | mh.msg_iovlen = ELEMENTSOF(b->auth_iovec) - b->auth_index; | |
75 | ||
76 | k = sendmsg(b->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
77 | if (k < 0) | |
78 | return errno == EAGAIN ? 0 : -errno; | |
79 | ||
80 | iovec_advance(b->auth_iovec, &b->auth_index, (size_t) k); | |
81 | ||
82 | return 1; | |
83 | } | |
84 | ||
85 | static int bus_socket_auth_verify(sd_bus *b) { | |
86 | char *e, *f, *start; | |
87 | sd_id128_t peer; | |
88 | unsigned i; | |
89 | int r; | |
90 | ||
91 | /* We expect two response lines: "OK" and possibly | |
92 | * "AGREE_UNIX_FD" */ | |
93 | ||
94 | e = memmem(b->rbuffer, b->rbuffer_size, "\r\n", 2); | |
95 | if (!e) | |
96 | return 0; | |
97 | ||
98 | if (b->negotiate_fds) { | |
99 | f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2); | |
100 | if (!f) | |
101 | return 0; | |
102 | ||
103 | start = f + 2; | |
104 | } else { | |
105 | f = NULL; | |
106 | start = e + 2; | |
107 | } | |
108 | ||
109 | /* Nice! We got all the lines we need. First check the OK | |
110 | * line */ | |
111 | ||
112 | if (e - (char*) b->rbuffer != 3 + 32) | |
113 | return -EPERM; | |
114 | ||
115 | if (memcmp(b->rbuffer, "OK ", 3)) | |
116 | return -EPERM; | |
117 | ||
118 | for (i = 0; i < 32; i += 2) { | |
119 | int x, y; | |
120 | ||
121 | x = unhexchar(((char*) b->rbuffer)[3 + i]); | |
122 | y = unhexchar(((char*) b->rbuffer)[3 + i + 1]); | |
123 | ||
124 | if (x < 0 || y < 0) | |
125 | return -EINVAL; | |
126 | ||
127 | peer.bytes[i/2] = ((uint8_t) x << 4 | (uint8_t) y); | |
128 | } | |
129 | ||
130 | if (!sd_id128_equal(b->peer, SD_ID128_NULL) && | |
131 | !sd_id128_equal(b->peer, peer)) | |
132 | return -EPERM; | |
133 | ||
134 | b->peer = peer; | |
135 | ||
136 | /* And possibly check the second line, too */ | |
137 | ||
138 | if (f) | |
139 | b->can_fds = | |
140 | (f - e == sizeof("\r\nAGREE_UNIX_FD") - 1) && | |
141 | memcmp(e + 2, "AGREE_UNIX_FD", sizeof("AGREE_UNIX_FD") - 1) == 0; | |
142 | ||
143 | b->rbuffer_size -= (start - (char*) b->rbuffer); | |
144 | memmove(b->rbuffer, start, b->rbuffer_size); | |
145 | ||
146 | r = bus_start_running(b); | |
147 | if (r < 0) | |
148 | return r; | |
149 | ||
150 | return 1; | |
151 | } | |
152 | ||
153 | static int bus_socket_read_auth(sd_bus *b) { | |
154 | struct msghdr mh; | |
155 | struct iovec iov; | |
156 | size_t n; | |
157 | ssize_t k; | |
158 | int r; | |
159 | void *p; | |
160 | ||
161 | assert(b); | |
162 | ||
163 | r = bus_socket_auth_verify(b); | |
164 | if (r != 0) | |
165 | return r; | |
166 | ||
167 | n = MAX(3 + 32 + 2 + sizeof("AGREE_UNIX_FD") - 1 + 2, b->rbuffer_size * 2); | |
168 | ||
169 | if (n > BUS_AUTH_SIZE_MAX) | |
170 | n = BUS_AUTH_SIZE_MAX; | |
171 | ||
172 | if (b->rbuffer_size >= n) | |
173 | return -ENOBUFS; | |
174 | ||
175 | p = realloc(b->rbuffer, n); | |
176 | if (!p) | |
177 | return -ENOMEM; | |
178 | ||
179 | b->rbuffer = p; | |
180 | ||
181 | zero(iov); | |
182 | iov.iov_base = (uint8_t*) b->rbuffer + b->rbuffer_size; | |
183 | iov.iov_len = n - b->rbuffer_size; | |
184 | ||
185 | zero(mh); | |
186 | mh.msg_iov = &iov; | |
187 | mh.msg_iovlen = 1; | |
188 | ||
189 | k = recvmsg(b->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
190 | if (k < 0) | |
191 | return errno == EAGAIN ? 0 : -errno; | |
192 | if (k == 0) | |
193 | return -ECONNRESET; | |
194 | ||
195 | b->rbuffer_size += k; | |
196 | ||
197 | r = bus_socket_auth_verify(b); | |
198 | if (r != 0) | |
199 | return r; | |
200 | ||
201 | return 1; | |
202 | } | |
203 | ||
204 | static int bus_socket_setup(sd_bus *b) { | |
0f4b73c8 | 205 | int enable; |
a7e3212d LP |
206 | |
207 | assert(b); | |
208 | ||
d65ddaa4 LP |
209 | /* Enable SO_PASSCRED + SO_PASSEC. We try this on any |
210 | * socket, just in case. */ | |
0f4b73c8 LP |
211 | enable = !b->bus_client; |
212 | setsockopt(b->fd, SOL_SOCKET, SO_PASSCRED, &enable, sizeof(enable)); | |
213 | setsockopt(b->fd, SOL_SOCKET, SO_PASSSEC, &enable, sizeof(enable)); | |
a7e3212d LP |
214 | |
215 | /* Increase the buffers to a MB */ | |
216 | fd_inc_rcvbuf(b->fd, 1024*1024); | |
217 | fd_inc_sndbuf(b->fd, 1024*1024); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | static int bus_socket_start_auth(sd_bus *b) { | |
223 | static const char auth_prefix[] = "\0AUTH EXTERNAL "; | |
224 | static const char auth_suffix_with_unix_fd[] = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n"; | |
225 | static const char auth_suffix_without_unix_fd[] = "\r\nBEGIN\r\n"; | |
226 | ||
227 | char text[20 + 1]; /* enough space for a 64bit integer plus NUL */ | |
228 | size_t l; | |
229 | const char *auth_suffix; | |
230 | int domain = 0, r; | |
231 | socklen_t sl; | |
232 | ||
233 | assert(b); | |
234 | ||
235 | b->state = BUS_AUTHENTICATING; | |
236 | ||
237 | sl = sizeof(domain); | |
238 | r = getsockopt(b->fd, SOL_SOCKET, SO_DOMAIN, &domain, &sl); | |
239 | if (r < 0) | |
240 | return -errno; | |
241 | ||
242 | if (domain != AF_UNIX) | |
243 | b->negotiate_fds = false; | |
244 | ||
245 | snprintf(text, sizeof(text), "%llu", (unsigned long long) geteuid()); | |
246 | char_array_0(text); | |
247 | ||
248 | l = strlen(text); | |
249 | b->auth_uid = hexmem(text, l); | |
250 | if (!b->auth_uid) | |
251 | return -ENOMEM; | |
252 | ||
253 | auth_suffix = b->negotiate_fds ? auth_suffix_with_unix_fd : auth_suffix_without_unix_fd; | |
254 | ||
255 | b->auth_iovec[0].iov_base = (void*) auth_prefix; | |
256 | b->auth_iovec[0].iov_len = sizeof(auth_prefix) -1; | |
257 | b->auth_iovec[1].iov_base = (void*) b->auth_uid; | |
258 | b->auth_iovec[1].iov_len = l * 2; | |
259 | b->auth_iovec[2].iov_base = (void*) auth_suffix; | |
260 | b->auth_iovec[2].iov_len = strlen(auth_suffix); | |
261 | b->auth_size = sizeof(auth_prefix) - 1 + l * 2 + sizeof(auth_suffix) - 1; | |
262 | ||
263 | return bus_socket_write_auth(b); | |
264 | } | |
265 | ||
266 | int bus_socket_connect(sd_bus *b) { | |
267 | int r; | |
268 | ||
269 | assert(b); | |
270 | assert(b->fd < 0); | |
271 | assert(b->sockaddr.sa.sa_family != AF_UNSPEC); | |
272 | ||
273 | b->fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); | |
274 | if (b->fd < 0) | |
275 | return -errno; | |
276 | ||
277 | r = bus_socket_setup(b); | |
278 | if (r < 0) | |
279 | return r; | |
280 | ||
281 | r = connect(b->fd, &b->sockaddr.sa, b->sockaddr_size); | |
282 | if (r < 0) { | |
283 | if (errno == EINPROGRESS) | |
284 | return 1; | |
285 | ||
286 | return -errno; | |
287 | } | |
288 | ||
289 | return bus_socket_start_auth(b); | |
290 | } | |
291 | ||
292 | int bus_socket_exec(sd_bus *b) { | |
293 | int s[2]; | |
294 | pid_t pid; | |
295 | ||
296 | assert(b); | |
297 | assert(b->fd < 0); | |
298 | assert(b->exec_path); | |
299 | ||
300 | b->fd = socketpair(AF_UNIX, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, s); | |
301 | if (b->fd < 0) | |
302 | return -errno; | |
303 | ||
304 | pid = fork(); | |
305 | if (pid < 0) { | |
306 | close_pipe(s); | |
307 | return -errno; | |
308 | } | |
309 | if (pid == 0) { | |
310 | /* Child */ | |
311 | ||
312 | close_all_fds(s, 2); | |
313 | close_nointr_nofail(s[0]); | |
314 | ||
315 | assert_se(dup3(s[1], STDIN_FILENO, 0) == STDIN_FILENO); | |
316 | assert_se(dup3(s[1], STDOUT_FILENO, 0) == STDOUT_FILENO); | |
317 | ||
318 | if (s[1] != STDIN_FILENO && s[1] != STDOUT_FILENO) | |
319 | close_nointr_nofail(s[1]); | |
320 | ||
321 | fd_cloexec(STDIN_FILENO, false); | |
322 | fd_cloexec(STDOUT_FILENO, false); | |
323 | fd_nonblock(STDIN_FILENO, false); | |
324 | fd_nonblock(STDOUT_FILENO, false); | |
325 | ||
326 | if (b->exec_argv) | |
327 | execvp(b->exec_path, b->exec_argv); | |
328 | else { | |
329 | const char *argv[] = { b->exec_path, NULL }; | |
330 | execvp(b->exec_path, (char**) argv); | |
331 | } | |
332 | ||
333 | _exit(EXIT_FAILURE); | |
334 | } | |
335 | ||
336 | close_nointr_nofail(s[1]); | |
337 | b->fd = s[0]; | |
338 | ||
339 | return bus_socket_start_auth(b); | |
340 | } | |
341 | ||
342 | int bus_socket_take_fd(sd_bus *b) { | |
343 | int r; | |
344 | assert(b); | |
345 | ||
346 | r = bus_socket_setup(b); | |
347 | if (r < 0) | |
348 | return r; | |
349 | ||
350 | return bus_socket_start_auth(b); | |
351 | } | |
352 | ||
353 | int bus_socket_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) { | |
354 | struct msghdr mh; | |
355 | struct iovec *iov; | |
356 | ssize_t k; | |
357 | size_t n; | |
358 | unsigned j; | |
359 | ||
360 | assert(bus); | |
361 | assert(m); | |
362 | assert(idx); | |
363 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); | |
364 | ||
365 | if (*idx >= m->size) | |
366 | return 0; | |
367 | zero(mh); | |
368 | ||
369 | if (m->n_fds > 0) { | |
370 | struct cmsghdr *control; | |
371 | control = alloca(CMSG_SPACE(sizeof(int) * m->n_fds)); | |
372 | ||
373 | mh.msg_control = control; | |
374 | control->cmsg_level = SOL_SOCKET; | |
375 | control->cmsg_type = SCM_RIGHTS; | |
376 | mh.msg_controllen = control->cmsg_len = CMSG_LEN(sizeof(int) * m->n_fds); | |
377 | memcpy(CMSG_DATA(control), m->fds, sizeof(int) * m->n_fds); | |
378 | } | |
379 | ||
380 | n = m->n_iovec * sizeof(struct iovec); | |
381 | iov = alloca(n); | |
382 | memcpy(iov, m->iovec, n); | |
383 | ||
384 | j = 0; | |
385 | iovec_advance(iov, &j, *idx); | |
386 | ||
387 | mh.msg_iov = iov; | |
388 | mh.msg_iovlen = m->n_iovec; | |
389 | ||
390 | k = sendmsg(bus->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
391 | if (k < 0) | |
392 | return errno == EAGAIN ? 0 : -errno; | |
393 | ||
394 | *idx += (size_t) k; | |
395 | return 1; | |
396 | } | |
397 | ||
398 | static int bus_socket_read_message_need(sd_bus *bus, size_t *need) { | |
399 | uint32_t a, b; | |
400 | uint8_t e; | |
401 | uint64_t sum; | |
402 | ||
403 | assert(bus); | |
404 | assert(need); | |
405 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); | |
406 | ||
407 | if (bus->rbuffer_size < sizeof(struct bus_header)) { | |
408 | *need = sizeof(struct bus_header) + 8; | |
409 | ||
410 | /* Minimum message size: | |
411 | * | |
412 | * Header + | |
413 | * | |
414 | * Method Call: +2 string headers | |
415 | * Signal: +3 string headers | |
416 | * Method Error: +1 string headers | |
417 | * +1 uint32 headers | |
418 | * Method Reply: +1 uint32 headers | |
419 | * | |
420 | * A string header is at least 9 bytes | |
421 | * A uint32 header is at least 8 bytes | |
422 | * | |
423 | * Hence the minimum message size of a valid message | |
424 | * is header + 8 bytes */ | |
425 | ||
426 | return 0; | |
427 | } | |
428 | ||
429 | a = ((const uint32_t*) bus->rbuffer)[1]; | |
430 | b = ((const uint32_t*) bus->rbuffer)[3]; | |
431 | ||
432 | e = ((const uint8_t*) bus->rbuffer)[0]; | |
433 | if (e == SD_BUS_LITTLE_ENDIAN) { | |
434 | a = le32toh(a); | |
435 | b = le32toh(b); | |
436 | } else if (e == SD_BUS_BIG_ENDIAN) { | |
437 | a = be32toh(a); | |
438 | b = be32toh(b); | |
439 | } else | |
440 | return -EBADMSG; | |
441 | ||
442 | sum = (uint64_t) sizeof(struct bus_header) + (uint64_t) ALIGN_TO(b, 8) + (uint64_t) a; | |
443 | if (sum >= BUS_MESSAGE_SIZE_MAX) | |
444 | return -ENOBUFS; | |
445 | ||
446 | *need = (size_t) sum; | |
447 | return 0; | |
448 | } | |
449 | ||
450 | static int bus_socket_make_message(sd_bus *bus, size_t size, sd_bus_message **m) { | |
451 | sd_bus_message *t; | |
452 | void *b; | |
453 | int r; | |
454 | ||
455 | assert(bus); | |
456 | assert(m); | |
457 | assert(bus->rbuffer_size >= size); | |
458 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); | |
459 | ||
460 | if (bus->rbuffer_size > size) { | |
461 | b = memdup((const uint8_t*) bus->rbuffer + size, | |
462 | bus->rbuffer_size - size); | |
463 | if (!b) | |
464 | return -ENOMEM; | |
465 | } else | |
466 | b = NULL; | |
467 | ||
468 | r = bus_message_from_malloc(bus->rbuffer, size, | |
469 | bus->fds, bus->n_fds, | |
0f4b73c8 LP |
470 | bus->ucred_valid ? &bus->ucred : NULL, |
471 | bus->label[0] ? bus->label : NULL, | |
a7e3212d LP |
472 | &t); |
473 | if (r < 0) { | |
474 | free(b); | |
475 | return r; | |
476 | } | |
477 | ||
478 | bus->rbuffer = b; | |
479 | bus->rbuffer_size -= size; | |
480 | ||
481 | bus->fds = NULL; | |
482 | bus->n_fds = 0; | |
483 | ||
484 | *m = t; | |
485 | return 1; | |
486 | } | |
487 | ||
488 | int bus_socket_read_message(sd_bus *bus, sd_bus_message **m) { | |
489 | struct msghdr mh; | |
490 | struct iovec iov; | |
491 | ssize_t k; | |
492 | size_t need; | |
493 | int r; | |
494 | void *b; | |
495 | union { | |
496 | struct cmsghdr cmsghdr; | |
497 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX) + | |
498 | CMSG_SPACE(sizeof(struct ucred)) + | |
499 | CMSG_SPACE(NAME_MAX)]; /*selinux label */ | |
500 | } control; | |
501 | struct cmsghdr *cmsg; | |
502 | ||
503 | assert(bus); | |
504 | assert(m); | |
505 | assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); | |
506 | ||
507 | r = bus_socket_read_message_need(bus, &need); | |
508 | if (r < 0) | |
509 | return r; | |
510 | ||
511 | if (bus->rbuffer_size >= need) | |
512 | return bus_socket_make_message(bus, need, m); | |
513 | ||
514 | b = realloc(bus->rbuffer, need); | |
515 | if (!b) | |
516 | return -ENOMEM; | |
517 | ||
518 | bus->rbuffer = b; | |
519 | ||
520 | zero(iov); | |
521 | iov.iov_base = (uint8_t*) bus->rbuffer + bus->rbuffer_size; | |
522 | iov.iov_len = need - bus->rbuffer_size; | |
523 | ||
524 | zero(mh); | |
525 | mh.msg_iov = &iov; | |
526 | mh.msg_iovlen = 1; | |
527 | mh.msg_control = &control; | |
528 | mh.msg_controllen = sizeof(control); | |
529 | ||
530 | k = recvmsg(bus->fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); | |
531 | if (k < 0) | |
532 | return errno == EAGAIN ? 0 : -errno; | |
533 | if (k == 0) | |
534 | return -ECONNRESET; | |
535 | ||
536 | bus->rbuffer_size += k; | |
537 | ||
538 | for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg)) { | |
539 | if (cmsg->cmsg_level == SOL_SOCKET && | |
540 | cmsg->cmsg_type == SCM_RIGHTS) { | |
541 | int n, *f; | |
542 | ||
543 | n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
544 | ||
5384d4b3 LP |
545 | if (!bus->can_fds) { |
546 | /* Whut? We received fds but this | |
547 | * isn't actually enabled? Close them, | |
548 | * and fail */ | |
549 | ||
550 | close_many((int*) CMSG_DATA(cmsg), n); | |
551 | return -EIO; | |
552 | } | |
553 | ||
a7e3212d LP |
554 | f = realloc(bus->fds, sizeof(int) + (bus->n_fds + n)); |
555 | if (!f) { | |
556 | close_many((int*) CMSG_DATA(cmsg), n); | |
557 | return -ENOMEM; | |
558 | } | |
559 | ||
560 | memcpy(f + bus->n_fds, CMSG_DATA(cmsg), n * sizeof(int)); | |
561 | bus->fds = f; | |
562 | bus->n_fds += n; | |
563 | } else if (cmsg->cmsg_level == SOL_SOCKET && | |
564 | cmsg->cmsg_type == SCM_CREDENTIALS && | |
565 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) { | |
566 | ||
567 | memcpy(&bus->ucred, CMSG_DATA(cmsg), sizeof(struct ucred)); | |
568 | bus->ucred_valid = true; | |
569 | ||
570 | } else if (cmsg->cmsg_level == SOL_SOCKET && | |
571 | cmsg->cmsg_type == SCM_SECURITY) { | |
572 | ||
573 | size_t l; | |
574 | l = cmsg->cmsg_len - CMSG_LEN(0); | |
575 | memcpy(&bus->label, CMSG_DATA(cmsg), l); | |
576 | bus->label[l] = 0; | |
577 | } | |
578 | } | |
579 | ||
580 | r = bus_socket_read_message_need(bus, &need); | |
581 | if (r < 0) | |
582 | return r; | |
583 | ||
584 | if (bus->rbuffer_size >= need) | |
585 | return bus_socket_make_message(bus, need, m); | |
586 | ||
587 | return 1; | |
588 | } | |
589 | ||
590 | int bus_socket_process_opening(sd_bus *b) { | |
591 | int error = 0; | |
592 | socklen_t slen = sizeof(error); | |
593 | struct pollfd p; | |
594 | int r; | |
595 | ||
596 | assert(b); | |
597 | assert(b->state == BUS_OPENING); | |
598 | ||
599 | zero(p); | |
600 | p.fd = b->fd; | |
601 | p.events = POLLOUT; | |
602 | ||
603 | r = poll(&p, 1, 0); | |
604 | if (r < 0) | |
605 | return -errno; | |
606 | ||
607 | if (!(p.revents & (POLLOUT|POLLERR|POLLHUP))) | |
608 | return 0; | |
609 | ||
610 | r = getsockopt(b->fd, SOL_SOCKET, SO_ERROR, &error, &slen); | |
611 | if (r < 0) | |
612 | b->last_connect_error = errno; | |
613 | else if (error != 0) | |
614 | b->last_connect_error = error; | |
615 | else if (p.revents & (POLLERR|POLLHUP)) | |
616 | b->last_connect_error = ECONNREFUSED; | |
617 | else | |
618 | return bus_socket_start_auth(b); | |
619 | ||
620 | return bus_next_address(b); | |
621 | } | |
622 | ||
623 | int bus_socket_process_authenticating(sd_bus *b) { | |
624 | int r; | |
625 | ||
626 | assert(b); | |
627 | assert(b->state == BUS_AUTHENTICATING); | |
628 | ||
629 | if (now(CLOCK_MONOTONIC) >= b->auth_timeout) | |
630 | return -ETIMEDOUT; | |
631 | ||
632 | r = bus_socket_write_auth(b); | |
633 | if (r != 0) | |
634 | return r; | |
635 | ||
636 | return bus_socket_read_auth(b); | |
637 | } |