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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
a7e3212d LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2013 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
21 | #include <endian.h> | |
07630cea | 22 | #include <poll.h> |
a7e3212d LP |
23 | #include <stdlib.h> |
24 | #include <unistd.h> | |
a7e3212d | 25 | |
07630cea | 26 | #include "sd-bus.h" |
24882e06 | 27 | #include "sd-daemon.h" |
07630cea | 28 | |
b5efdb8a | 29 | #include "alloc-util.h" |
07630cea LP |
30 | #include "bus-internal.h" |
31 | #include "bus-message.h" | |
3ffd4af2 LP |
32 | #include "bus-socket.h" |
33 | #include "fd-util.h" | |
f97b34a6 | 34 | #include "format-util.h" |
8a5cd31e | 35 | #include "fs-util.h" |
15a5e950 | 36 | #include "hexdecoct.h" |
8a5cd31e | 37 | #include "io-util.h" |
a7e3212d LP |
38 | #include "macro.h" |
39 | #include "missing.h" | |
8a5cd31e | 40 | #include "path-util.h" |
dccca82b | 41 | #include "process-util.h" |
7fc04b12 | 42 | #include "selinux-util.h" |
24882e06 | 43 | #include "signal-util.h" |
15a5e950 | 44 | #include "stdio-util.h" |
07630cea | 45 | #include "string-util.h" |
b1d4f8e1 | 46 | #include "user-util.h" |
07630cea LP |
47 | #include "utf8.h" |
48 | #include "util.h" | |
a7e3212d | 49 | |
aec6d91f LP |
50 | #define SNDBUF_SIZE (8*1024*1024) |
51 | ||
2181a7f5 | 52 | static void iovec_advance(struct iovec iov[], unsigned *idx, size_t size) { |
a7e3212d LP |
53 | |
54 | while (size > 0) { | |
55 | struct iovec *i = iov + *idx; | |
56 | ||
57 | if (i->iov_len > size) { | |
58 | i->iov_base = (uint8_t*) i->iov_base + size; | |
59 | i->iov_len -= size; | |
60 | return; | |
61 | } | |
62 | ||
63 | size -= i->iov_len; | |
64 | ||
65 | i->iov_base = NULL; | |
66 | i->iov_len = 0; | |
67 | ||
313cefa1 | 68 | (*idx)++; |
a7e3212d LP |
69 | } |
70 | } | |
71 | ||
bc7fd8cd | 72 | static int append_iovec(sd_bus_message *m, const void *p, size_t sz) { |
2100fa10 LP |
73 | assert(m); |
74 | assert(p); | |
75 | assert(sz > 0); | |
76 | ||
77 | m->iovec[m->n_iovec].iov_base = (void*) p; | |
78 | m->iovec[m->n_iovec].iov_len = sz; | |
79 | m->n_iovec++; | |
bc7fd8cd LP |
80 | |
81 | return 0; | |
2100fa10 LP |
82 | } |
83 | ||
bc7fd8cd LP |
84 | static int bus_message_setup_iovec(sd_bus_message *m) { |
85 | struct bus_body_part *part; | |
13c299d3 | 86 | unsigned n, i; |
bc7fd8cd LP |
87 | int r; |
88 | ||
2100fa10 LP |
89 | assert(m); |
90 | assert(m->sealed); | |
91 | ||
92 | if (m->n_iovec > 0) | |
bc7fd8cd LP |
93 | return 0; |
94 | ||
95 | assert(!m->iovec); | |
2100fa10 | 96 | |
c91cb83c | 97 | n = 1 + m->n_body_parts; |
bc7fd8cd LP |
98 | if (n < ELEMENTSOF(m->iovec_fixed)) |
99 | m->iovec = m->iovec_fixed; | |
100 | else { | |
101 | m->iovec = new(struct iovec, n); | |
66b26c5c LP |
102 | if (!m->iovec) { |
103 | r = -ENOMEM; | |
104 | goto fail; | |
105 | } | |
bc7fd8cd | 106 | } |
2100fa10 | 107 | |
c91cb83c | 108 | r = append_iovec(m, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
bc7fd8cd | 109 | if (r < 0) |
66b26c5c | 110 | goto fail; |
2100fa10 | 111 | |
9b29bb68 | 112 | MESSAGE_FOREACH_PART(part, i, m) { |
66b26c5c LP |
113 | r = bus_body_part_map(part); |
114 | if (r < 0) | |
115 | goto fail; | |
116 | ||
bc7fd8cd LP |
117 | r = append_iovec(m, part->data, part->size); |
118 | if (r < 0) | |
66b26c5c | 119 | goto fail; |
bc7fd8cd LP |
120 | } |
121 | ||
122 | assert(n == m->n_iovec); | |
123 | ||
124 | return 0; | |
66b26c5c LP |
125 | |
126 | fail: | |
127 | m->poisoned = true; | |
128 | return r; | |
2100fa10 LP |
129 | } |
130 | ||
2181a7f5 LP |
131 | bool bus_socket_auth_needs_write(sd_bus *b) { |
132 | ||
133 | unsigned i; | |
134 | ||
135 | if (b->auth_index >= ELEMENTSOF(b->auth_iovec)) | |
136 | return false; | |
137 | ||
138 | for (i = b->auth_index; i < ELEMENTSOF(b->auth_iovec); i++) { | |
139 | struct iovec *j = b->auth_iovec + i; | |
140 | ||
141 | if (j->iov_len > 0) | |
142 | return true; | |
143 | } | |
144 | ||
145 | return false; | |
146 | } | |
147 | ||
a7e3212d | 148 | static int bus_socket_write_auth(sd_bus *b) { |
a7e3212d LP |
149 | ssize_t k; |
150 | ||
151 | assert(b); | |
152 | assert(b->state == BUS_AUTHENTICATING); | |
153 | ||
2181a7f5 | 154 | if (!bus_socket_auth_needs_write(b)) |
a7e3212d LP |
155 | return 0; |
156 | ||
15d5af81 LP |
157 | if (b->prefer_writev) |
158 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
159 | else { | |
160 | struct msghdr mh; | |
161 | zero(mh); | |
162 | ||
163 | mh.msg_iov = b->auth_iovec + b->auth_index; | |
164 | mh.msg_iovlen = ELEMENTSOF(b->auth_iovec) - b->auth_index; | |
165 | ||
166 | k = sendmsg(b->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
167 | if (k < 0 && errno == ENOTSOCK) { | |
168 | b->prefer_writev = true; | |
169 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
170 | } | |
171 | } | |
a7e3212d | 172 | |
a7e3212d LP |
173 | if (k < 0) |
174 | return errno == EAGAIN ? 0 : -errno; | |
175 | ||
176 | iovec_advance(b->auth_iovec, &b->auth_index, (size_t) k); | |
a7e3212d LP |
177 | return 1; |
178 | } | |
179 | ||
2181a7f5 | 180 | static int bus_socket_auth_verify_client(sd_bus *b) { |
a7e3212d LP |
181 | char *e, *f, *start; |
182 | sd_id128_t peer; | |
183 | unsigned i; | |
184 | int r; | |
185 | ||
2181a7f5 LP |
186 | assert(b); |
187 | ||
a7e3212d LP |
188 | /* We expect two response lines: "OK" and possibly |
189 | * "AGREE_UNIX_FD" */ | |
190 | ||
6e6c21c8 | 191 | e = memmem_safe(b->rbuffer, b->rbuffer_size, "\r\n", 2); |
a7e3212d LP |
192 | if (!e) |
193 | return 0; | |
194 | ||
c7db1984 | 195 | if (b->accept_fd) { |
a7e3212d LP |
196 | f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2); |
197 | if (!f) | |
198 | return 0; | |
199 | ||
200 | start = f + 2; | |
201 | } else { | |
202 | f = NULL; | |
203 | start = e + 2; | |
204 | } | |
205 | ||
206 | /* Nice! We got all the lines we need. First check the OK | |
207 | * line */ | |
208 | ||
209 | if (e - (char*) b->rbuffer != 3 + 32) | |
210 | return -EPERM; | |
211 | ||
212 | if (memcmp(b->rbuffer, "OK ", 3)) | |
213 | return -EPERM; | |
214 | ||
2181a7f5 LP |
215 | b->auth = b->anonymous_auth ? BUS_AUTH_ANONYMOUS : BUS_AUTH_EXTERNAL; |
216 | ||
a7e3212d LP |
217 | for (i = 0; i < 32; i += 2) { |
218 | int x, y; | |
219 | ||
220 | x = unhexchar(((char*) b->rbuffer)[3 + i]); | |
221 | y = unhexchar(((char*) b->rbuffer)[3 + i + 1]); | |
222 | ||
223 | if (x < 0 || y < 0) | |
224 | return -EINVAL; | |
225 | ||
226 | peer.bytes[i/2] = ((uint8_t) x << 4 | (uint8_t) y); | |
227 | } | |
228 | ||
3bbaff3e | 229 | if (!sd_id128_is_null(b->server_id) && |
98178d39 | 230 | !sd_id128_equal(b->server_id, peer)) |
a7e3212d LP |
231 | return -EPERM; |
232 | ||
98178d39 | 233 | b->server_id = peer; |
a7e3212d LP |
234 | |
235 | /* And possibly check the second line, too */ | |
236 | ||
237 | if (f) | |
238 | b->can_fds = | |
fbd0b64f LP |
239 | (f - e == STRLEN("\r\nAGREE_UNIX_FD")) && |
240 | memcmp(e + 2, "AGREE_UNIX_FD", | |
241 | STRLEN("AGREE_UNIX_FD")) == 0; | |
a7e3212d LP |
242 | |
243 | b->rbuffer_size -= (start - (char*) b->rbuffer); | |
244 | memmove(b->rbuffer, start, b->rbuffer_size); | |
245 | ||
246 | r = bus_start_running(b); | |
247 | if (r < 0) | |
248 | return r; | |
249 | ||
250 | return 1; | |
251 | } | |
252 | ||
2181a7f5 LP |
253 | static bool line_equals(const char *s, size_t m, const char *line) { |
254 | size_t l; | |
255 | ||
256 | l = strlen(line); | |
257 | if (l != m) | |
258 | return false; | |
259 | ||
260 | return memcmp(s, line, l) == 0; | |
261 | } | |
262 | ||
263 | static bool line_begins(const char *s, size_t m, const char *word) { | |
264 | size_t l; | |
265 | ||
266 | l = strlen(word); | |
267 | if (m < l) | |
268 | return false; | |
269 | ||
270 | if (memcmp(s, word, l) != 0) | |
271 | return false; | |
272 | ||
273 | return m == l || (m > l && s[l] == ' '); | |
274 | } | |
275 | ||
276 | static int verify_anonymous_token(sd_bus *b, const char *p, size_t l) { | |
277 | _cleanup_free_ char *token = NULL; | |
30494563 TG |
278 | size_t len; |
279 | int r; | |
2181a7f5 LP |
280 | |
281 | if (!b->anonymous_auth) | |
282 | return 0; | |
283 | ||
284 | if (l <= 0) | |
285 | return 1; | |
286 | ||
287 | assert(p[0] == ' '); | |
288 | p++; l--; | |
289 | ||
290 | if (l % 2 != 0) | |
291 | return 0; | |
2181a7f5 | 292 | |
30494563 TG |
293 | r = unhexmem(p, l, (void **) &token, &len); |
294 | if (r < 0) | |
295 | return 0; | |
296 | ||
297 | if (memchr(token, 0, len)) | |
2181a7f5 LP |
298 | return 0; |
299 | ||
300 | return !!utf8_is_valid(token); | |
301 | } | |
302 | ||
303 | static int verify_external_token(sd_bus *b, const char *p, size_t l) { | |
304 | _cleanup_free_ char *token = NULL; | |
30494563 | 305 | size_t len; |
2181a7f5 LP |
306 | uid_t u; |
307 | int r; | |
308 | ||
309 | /* We don't do any real authentication here. Instead, we if | |
310 | * the owner of this bus wanted authentication he should have | |
311 | * checked SO_PEERCRED before even creating the bus object. */ | |
312 | ||
8411d2a2 | 313 | if (!b->anonymous_auth && !b->ucred_valid) |
2181a7f5 LP |
314 | return 0; |
315 | ||
316 | if (l <= 0) | |
317 | return 1; | |
318 | ||
319 | assert(p[0] == ' '); | |
320 | p++; l--; | |
321 | ||
322 | if (l % 2 != 0) | |
323 | return 0; | |
324 | ||
30494563 TG |
325 | r = unhexmem(p, l, (void**) &token, &len); |
326 | if (r < 0) | |
327 | return 0; | |
2181a7f5 | 328 | |
30494563 | 329 | if (memchr(token, 0, len)) |
2181a7f5 LP |
330 | return 0; |
331 | ||
332 | r = parse_uid(token, &u); | |
333 | if (r < 0) | |
334 | return 0; | |
335 | ||
8411d2a2 LP |
336 | /* We ignore the passed value if anonymous authentication is |
337 | * on anyway. */ | |
338 | if (!b->anonymous_auth && u != b->ucred.uid) | |
2181a7f5 LP |
339 | return 0; |
340 | ||
341 | return 1; | |
342 | } | |
343 | ||
344 | static int bus_socket_auth_write(sd_bus *b, const char *t) { | |
345 | char *p; | |
346 | size_t l; | |
347 | ||
348 | assert(b); | |
349 | assert(t); | |
350 | ||
351 | /* We only make use of the first iovec */ | |
945c2931 | 352 | assert(IN_SET(b->auth_index, 0, 1)); |
2181a7f5 LP |
353 | |
354 | l = strlen(t); | |
355 | p = malloc(b->auth_iovec[0].iov_len + l); | |
356 | if (!p) | |
357 | return -ENOMEM; | |
358 | ||
75f32f04 | 359 | memcpy_safe(p, b->auth_iovec[0].iov_base, b->auth_iovec[0].iov_len); |
2181a7f5 LP |
360 | memcpy(p + b->auth_iovec[0].iov_len, t, l); |
361 | ||
362 | b->auth_iovec[0].iov_base = p; | |
363 | b->auth_iovec[0].iov_len += l; | |
364 | ||
365 | free(b->auth_buffer); | |
366 | b->auth_buffer = p; | |
367 | b->auth_index = 0; | |
368 | return 0; | |
369 | } | |
370 | ||
371 | static int bus_socket_auth_write_ok(sd_bus *b) { | |
372 | char t[3 + 32 + 2 + 1]; | |
373 | ||
374 | assert(b); | |
375 | ||
5ffa8c81 | 376 | xsprintf(t, "OK " SD_ID128_FORMAT_STR "\r\n", SD_ID128_FORMAT_VAL(b->server_id)); |
2181a7f5 LP |
377 | |
378 | return bus_socket_auth_write(b, t); | |
379 | } | |
380 | ||
381 | static int bus_socket_auth_verify_server(sd_bus *b) { | |
382 | char *e; | |
383 | const char *line; | |
384 | size_t l; | |
385 | bool processed = false; | |
386 | int r; | |
387 | ||
388 | assert(b); | |
389 | ||
2b4ac889 | 390 | if (b->rbuffer_size < 1) |
2181a7f5 LP |
391 | return 0; |
392 | ||
393 | /* First char must be a NUL byte */ | |
394 | if (*(char*) b->rbuffer != 0) | |
395 | return -EIO; | |
396 | ||
2b4ac889 LP |
397 | if (b->rbuffer_size < 3) |
398 | return 0; | |
399 | ||
2181a7f5 LP |
400 | /* Begin with the first line */ |
401 | if (b->auth_rbegin <= 0) | |
402 | b->auth_rbegin = 1; | |
403 | ||
404 | for (;;) { | |
405 | /* Check if line is complete */ | |
406 | line = (char*) b->rbuffer + b->auth_rbegin; | |
407 | e = memmem(line, b->rbuffer_size - b->auth_rbegin, "\r\n", 2); | |
408 | if (!e) | |
409 | return processed; | |
410 | ||
411 | l = e - line; | |
412 | ||
413 | if (line_begins(line, l, "AUTH ANONYMOUS")) { | |
414 | ||
415 | r = verify_anonymous_token(b, line + 14, l - 14); | |
416 | if (r < 0) | |
417 | return r; | |
418 | if (r == 0) | |
419 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
420 | else { | |
421 | b->auth = BUS_AUTH_ANONYMOUS; | |
422 | r = bus_socket_auth_write_ok(b); | |
423 | } | |
424 | ||
425 | } else if (line_begins(line, l, "AUTH EXTERNAL")) { | |
426 | ||
427 | r = verify_external_token(b, line + 13, l - 13); | |
428 | if (r < 0) | |
429 | return r; | |
430 | if (r == 0) | |
431 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
432 | else { | |
433 | b->auth = BUS_AUTH_EXTERNAL; | |
434 | r = bus_socket_auth_write_ok(b); | |
435 | } | |
436 | ||
437 | } else if (line_begins(line, l, "AUTH")) | |
438 | r = bus_socket_auth_write(b, "REJECTED EXTERNAL ANONYMOUS\r\n"); | |
439 | else if (line_equals(line, l, "CANCEL") || | |
440 | line_begins(line, l, "ERROR")) { | |
441 | ||
442 | b->auth = _BUS_AUTH_INVALID; | |
443 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
444 | ||
445 | } else if (line_equals(line, l, "BEGIN")) { | |
446 | ||
447 | if (b->auth == _BUS_AUTH_INVALID) | |
448 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
449 | else { | |
450 | /* We can't leave from the auth phase | |
451 | * before we haven't written | |
452 | * everything queued, so let's check | |
453 | * that */ | |
454 | ||
455 | if (bus_socket_auth_needs_write(b)) | |
456 | return 1; | |
457 | ||
458 | b->rbuffer_size -= (e + 2 - (char*) b->rbuffer); | |
459 | memmove(b->rbuffer, e + 2, b->rbuffer_size); | |
460 | return bus_start_running(b); | |
461 | } | |
462 | ||
463 | } else if (line_begins(line, l, "DATA")) { | |
464 | ||
465 | if (b->auth == _BUS_AUTH_INVALID) | |
466 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
467 | else { | |
468 | if (b->auth == BUS_AUTH_ANONYMOUS) | |
469 | r = verify_anonymous_token(b, line + 4, l - 4); | |
470 | else | |
471 | r = verify_external_token(b, line + 4, l - 4); | |
472 | ||
473 | if (r < 0) | |
474 | return r; | |
475 | if (r == 0) { | |
476 | b->auth = _BUS_AUTH_INVALID; | |
477 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
478 | } else | |
479 | r = bus_socket_auth_write_ok(b); | |
480 | } | |
481 | } else if (line_equals(line, l, "NEGOTIATE_UNIX_FD")) { | |
c7db1984 | 482 | if (b->auth == _BUS_AUTH_INVALID || !b->accept_fd) |
2181a7f5 LP |
483 | r = bus_socket_auth_write(b, "ERROR\r\n"); |
484 | else { | |
485 | b->can_fds = true; | |
486 | r = bus_socket_auth_write(b, "AGREE_UNIX_FD\r\n"); | |
487 | } | |
488 | } else | |
489 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
490 | ||
491 | if (r < 0) | |
492 | return r; | |
493 | ||
494 | b->auth_rbegin = e + 2 - (char*) b->rbuffer; | |
495 | ||
496 | processed = true; | |
497 | } | |
498 | } | |
499 | ||
500 | static int bus_socket_auth_verify(sd_bus *b) { | |
501 | assert(b); | |
502 | ||
503 | if (b->is_server) | |
504 | return bus_socket_auth_verify_server(b); | |
505 | else | |
506 | return bus_socket_auth_verify_client(b); | |
507 | } | |
508 | ||
a7e3212d LP |
509 | static int bus_socket_read_auth(sd_bus *b) { |
510 | struct msghdr mh; | |
7f4e6a1c | 511 | struct iovec iov = {}; |
a7e3212d LP |
512 | size_t n; |
513 | ssize_t k; | |
514 | int r; | |
515 | void *p; | |
2181a7f5 LP |
516 | union { |
517 | struct cmsghdr cmsghdr; | |
d868f2a3 | 518 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
2181a7f5 | 519 | } control; |
15d5af81 | 520 | bool handle_cmsg = false; |
a7e3212d LP |
521 | |
522 | assert(b); | |
2181a7f5 | 523 | assert(b->state == BUS_AUTHENTICATING); |
a7e3212d LP |
524 | |
525 | r = bus_socket_auth_verify(b); | |
526 | if (r != 0) | |
527 | return r; | |
528 | ||
9607d947 | 529 | n = MAX(256u, b->rbuffer_size * 2); |
a7e3212d LP |
530 | |
531 | if (n > BUS_AUTH_SIZE_MAX) | |
532 | n = BUS_AUTH_SIZE_MAX; | |
533 | ||
534 | if (b->rbuffer_size >= n) | |
535 | return -ENOBUFS; | |
536 | ||
537 | p = realloc(b->rbuffer, n); | |
538 | if (!p) | |
539 | return -ENOMEM; | |
540 | ||
541 | b->rbuffer = p; | |
542 | ||
a7e3212d LP |
543 | iov.iov_base = (uint8_t*) b->rbuffer + b->rbuffer_size; |
544 | iov.iov_len = n - b->rbuffer_size; | |
545 | ||
15d5af81 LP |
546 | if (b->prefer_readv) |
547 | k = readv(b->input_fd, &iov, 1); | |
548 | else { | |
549 | zero(mh); | |
550 | mh.msg_iov = &iov; | |
551 | mh.msg_iovlen = 1; | |
552 | mh.msg_control = &control; | |
553 | mh.msg_controllen = sizeof(control); | |
554 | ||
555 | k = recvmsg(b->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); | |
556 | if (k < 0 && errno == ENOTSOCK) { | |
557 | b->prefer_readv = true; | |
558 | k = readv(b->input_fd, &iov, 1); | |
559 | } else | |
560 | handle_cmsg = true; | |
561 | } | |
a7e3212d LP |
562 | if (k < 0) |
563 | return errno == EAGAIN ? 0 : -errno; | |
564 | if (k == 0) | |
565 | return -ECONNRESET; | |
566 | ||
567 | b->rbuffer_size += k; | |
568 | ||
2a1288ff LP |
569 | if (handle_cmsg) { |
570 | struct cmsghdr *cmsg; | |
571 | ||
572 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
573 | if (cmsg->cmsg_level == SOL_SOCKET && |
574 | cmsg->cmsg_type == SCM_RIGHTS) { | |
575 | int j; | |
576 | ||
577 | /* Whut? We received fds during the auth | |
578 | * protocol? Somebody is playing games with | |
579 | * us. Close them all, and fail */ | |
580 | j = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
581 | close_many((int*) CMSG_DATA(cmsg), j); | |
582 | return -EIO; | |
d868f2a3 ZJS |
583 | } else |
584 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
585 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 586 | } |
2181a7f5 | 587 | |
a7e3212d LP |
588 | r = bus_socket_auth_verify(b); |
589 | if (r != 0) | |
590 | return r; | |
591 | ||
592 | return 1; | |
593 | } | |
594 | ||
8f04d2eb | 595 | void bus_socket_setup(sd_bus *b) { |
a7e3212d LP |
596 | assert(b); |
597 | ||
aec6d91f | 598 | /* Increase the buffers to 8 MB */ |
6ae22ffb LP |
599 | (void) fd_inc_rcvbuf(b->input_fd, SNDBUF_SIZE); |
600 | (void) fd_inc_sndbuf(b->output_fd, SNDBUF_SIZE); | |
a7e3212d | 601 | |
e1d337d4 | 602 | b->message_version = 1; |
0f437184 | 603 | b->message_endian = 0; |
8f04d2eb | 604 | } |
e1d337d4 | 605 | |
8f04d2eb | 606 | static void bus_get_peercred(sd_bus *b) { |
c4e6556c ZJS |
607 | int r; |
608 | ||
8f04d2eb | 609 | assert(b); |
18ac4643 LP |
610 | assert(!b->ucred_valid); |
611 | assert(!b->label); | |
612 | assert(b->n_groups == (size_t) -1); | |
8f04d2eb LP |
613 | |
614 | /* Get the peer for socketpair() sockets */ | |
eff05270 | 615 | b->ucred_valid = getpeercred(b->input_fd, &b->ucred) >= 0; |
c4e6556c ZJS |
616 | |
617 | /* Get the SELinux context of the peer */ | |
db7d1dca | 618 | r = getpeersec(b->input_fd, &b->label); |
18ac4643 | 619 | if (r < 0 && !IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) |
db7d1dca | 620 | log_debug_errno(r, "Failed to determine peer security context: %m"); |
18ac4643 LP |
621 | |
622 | /* Get the list of auxiliary groups of the peer */ | |
623 | r = getpeergroups(b->input_fd, &b->groups); | |
c599b325 | 624 | if (r >= 0) |
18ac4643 | 625 | b->n_groups = (size_t) r; |
c599b325 ZJS |
626 | else if (!IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) |
627 | log_debug_errno(r, "Failed to determine peer's group list: %m"); | |
a7e3212d LP |
628 | } |
629 | ||
2181a7f5 | 630 | static int bus_socket_start_auth_client(sd_bus *b) { |
a7e3212d | 631 | size_t l; |
2181a7f5 | 632 | const char *auth_suffix, *auth_prefix; |
a7e3212d LP |
633 | |
634 | assert(b); | |
635 | ||
2181a7f5 LP |
636 | if (b->anonymous_auth) { |
637 | auth_prefix = "\0AUTH ANONYMOUS "; | |
a7e3212d | 638 | |
2181a7f5 LP |
639 | /* For ANONYMOUS auth we send some arbitrary "trace" string */ |
640 | l = 9; | |
641 | b->auth_buffer = hexmem("anonymous", l); | |
642 | } else { | |
5ffa8c81 | 643 | char text[DECIMAL_STR_MAX(uid_t) + 1]; |
a7e3212d | 644 | |
2181a7f5 | 645 | auth_prefix = "\0AUTH EXTERNAL "; |
a7e3212d | 646 | |
5ffa8c81 | 647 | xsprintf(text, UID_FMT, geteuid()); |
a7e3212d | 648 | |
2181a7f5 LP |
649 | l = strlen(text); |
650 | b->auth_buffer = hexmem(text, l); | |
651 | } | |
652 | ||
653 | if (!b->auth_buffer) | |
a7e3212d LP |
654 | return -ENOMEM; |
655 | ||
c7db1984 | 656 | if (b->accept_fd) |
2181a7f5 LP |
657 | auth_suffix = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n"; |
658 | else | |
659 | auth_suffix = "\r\nBEGIN\r\n"; | |
a7e3212d LP |
660 | |
661 | b->auth_iovec[0].iov_base = (void*) auth_prefix; | |
2181a7f5 LP |
662 | b->auth_iovec[0].iov_len = 1 + strlen(auth_prefix + 1); |
663 | b->auth_iovec[1].iov_base = (void*) b->auth_buffer; | |
a7e3212d LP |
664 | b->auth_iovec[1].iov_len = l * 2; |
665 | b->auth_iovec[2].iov_base = (void*) auth_suffix; | |
666 | b->auth_iovec[2].iov_len = strlen(auth_suffix); | |
a7e3212d LP |
667 | |
668 | return bus_socket_write_auth(b); | |
669 | } | |
670 | ||
a7893c6b | 671 | int bus_socket_start_auth(sd_bus *b) { |
2181a7f5 LP |
672 | assert(b); |
673 | ||
8f04d2eb LP |
674 | bus_get_peercred(b); |
675 | ||
3e0e196e | 676 | bus_set_state(b, BUS_AUTHENTICATING); |
036d61b3 | 677 | b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_AUTH_TIMEOUT; |
2181a7f5 | 678 | |
9ab32f9d | 679 | if (sd_is_socket(b->input_fd, AF_UNIX, 0, 0) <= 0) |
c7db1984 | 680 | b->accept_fd = false; |
2181a7f5 | 681 | |
9ab32f9d LP |
682 | if (b->output_fd != b->input_fd) |
683 | if (sd_is_socket(b->output_fd, AF_UNIX, 0, 0) <= 0) | |
c7db1984 | 684 | b->accept_fd = false; |
e82c9509 | 685 | |
2181a7f5 LP |
686 | if (b->is_server) |
687 | return bus_socket_read_auth(b); | |
688 | else | |
689 | return bus_socket_start_auth_client(b); | |
690 | } | |
691 | ||
8a5cd31e LP |
692 | static int bus_socket_inotify_setup(sd_bus *b) { |
693 | _cleanup_free_ int *new_watches = NULL; | |
694 | _cleanup_free_ char *absolute = NULL; | |
695 | size_t n_allocated = 0, n = 0, done = 0, i; | |
696 | unsigned max_follow = 32; | |
697 | const char *p; | |
698 | int wd, r; | |
699 | ||
700 | assert(b); | |
701 | assert(b->watch_bind); | |
702 | assert(b->sockaddr.sa.sa_family == AF_UNIX); | |
703 | assert(b->sockaddr.un.sun_path[0] != 0); | |
704 | ||
705 | /* Sets up an inotify fd in case watch_bind is enabled: wait until the configured AF_UNIX file system socket | |
706 | * appears before connecting to it. The implemented is pretty simplistic: we just subscribe to relevant changes | |
707 | * to all prefix components of the path, and every time we get an event for that we try to reconnect again, | |
708 | * without actually caring what precisely the event we got told us. If we still can't connect we re-subscribe | |
709 | * to all relevant changes of anything in the path, so that our watches include any possibly newly created path | |
710 | * components. */ | |
711 | ||
712 | if (b->inotify_fd < 0) { | |
713 | b->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
714 | if (b->inotify_fd < 0) | |
715 | return -errno; | |
716 | } | |
717 | ||
718 | /* Make sure the path is NUL terminated */ | |
719 | p = strndupa(b->sockaddr.un.sun_path, sizeof(b->sockaddr.un.sun_path)); | |
720 | ||
721 | /* Make sure the path is absolute */ | |
722 | r = path_make_absolute_cwd(p, &absolute); | |
723 | if (r < 0) | |
724 | goto fail; | |
725 | ||
726 | /* Watch all parent directories, and don't mind any prefix that doesn't exist yet. For the innermost directory | |
727 | * that exists we want to know when files are created or moved into it. For all parents of it we just care if | |
728 | * they are removed or renamed. */ | |
729 | ||
730 | if (!GREEDY_REALLOC(new_watches, n_allocated, n + 1)) { | |
731 | r = -ENOMEM; | |
732 | goto fail; | |
733 | } | |
734 | ||
735 | /* Start with the top-level directory, which is a bit simpler than the rest, since it can't be a symlink, and | |
736 | * always exists */ | |
737 | wd = inotify_add_watch(b->inotify_fd, "/", IN_CREATE|IN_MOVED_TO); | |
738 | if (wd < 0) { | |
739 | r = log_debug_errno(errno, "Failed to add inotify watch on /: %m"); | |
740 | goto fail; | |
741 | } else | |
742 | new_watches[n++] = wd; | |
743 | ||
744 | for (;;) { | |
745 | _cleanup_free_ char *component = NULL, *prefix = NULL, *destination = NULL; | |
746 | size_t n_slashes, n_component; | |
747 | char *c = NULL; | |
748 | ||
749 | n_slashes = strspn(absolute + done, "/"); | |
750 | n_component = n_slashes + strcspn(absolute + done + n_slashes, "/"); | |
751 | ||
752 | if (n_component == 0) /* The end */ | |
753 | break; | |
754 | ||
755 | component = strndup(absolute + done, n_component); | |
756 | if (!component) { | |
757 | r = -ENOMEM; | |
758 | goto fail; | |
759 | } | |
760 | ||
761 | /* A trailing slash? That's a directory, and not a socket then */ | |
762 | if (path_equal(component, "/")) { | |
763 | r = -EISDIR; | |
764 | goto fail; | |
765 | } | |
766 | ||
767 | /* A single dot? Let's eat this up */ | |
768 | if (path_equal(component, "/.")) { | |
769 | done += n_component; | |
770 | continue; | |
771 | } | |
772 | ||
773 | prefix = strndup(absolute, done + n_component); | |
774 | if (!prefix) { | |
775 | r = -ENOMEM; | |
776 | goto fail; | |
777 | } | |
778 | ||
779 | if (!GREEDY_REALLOC(new_watches, n_allocated, n + 1)) { | |
780 | r = -ENOMEM; | |
781 | goto fail; | |
782 | } | |
783 | ||
784 | wd = inotify_add_watch(b->inotify_fd, prefix, IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO|IN_DONT_FOLLOW); | |
785 | log_debug("Added inotify watch for %s on bus %s: %i", prefix, strna(b->description), wd); | |
786 | ||
787 | if (wd < 0) { | |
788 | if (IN_SET(errno, ENOENT, ELOOP)) | |
789 | break; /* This component doesn't exist yet, or the path contains a cyclic symlink right now */ | |
790 | ||
791 | r = log_debug_errno(errno, "Failed to add inotify watch on %s: %m", isempty(prefix) ? "/" : prefix); | |
792 | goto fail; | |
793 | } else | |
794 | new_watches[n++] = wd; | |
795 | ||
796 | /* Check if this is possibly a symlink. If so, let's follow it and watch it too. */ | |
797 | r = readlink_malloc(prefix, &destination); | |
798 | if (r == -EINVAL) { /* not a symlink */ | |
799 | done += n_component; | |
800 | continue; | |
801 | } | |
802 | if (r < 0) | |
803 | goto fail; | |
804 | ||
805 | if (isempty(destination)) { /* Empty symlink target? Yuck! */ | |
806 | r = -EINVAL; | |
807 | goto fail; | |
808 | } | |
809 | ||
810 | if (max_follow <= 0) { /* Let's make sure we don't follow symlinks forever */ | |
811 | r = -ELOOP; | |
812 | goto fail; | |
813 | } | |
814 | ||
815 | if (path_is_absolute(destination)) { | |
816 | /* For absolute symlinks we build the new path and start anew */ | |
817 | c = strjoin(destination, absolute + done + n_component); | |
818 | done = 0; | |
819 | } else { | |
820 | _cleanup_free_ char *t = NULL; | |
821 | ||
822 | /* For relative symlinks we replace the last component, and try again */ | |
823 | t = strndup(absolute, done); | |
824 | if (!t) | |
825 | return -ENOMEM; | |
826 | ||
827 | c = strjoin(t, "/", destination, absolute + done + n_component); | |
828 | } | |
829 | if (!c) { | |
830 | r = -ENOMEM; | |
831 | goto fail; | |
832 | } | |
833 | ||
834 | free(absolute); | |
835 | absolute = c; | |
836 | ||
837 | max_follow--; | |
838 | } | |
839 | ||
840 | /* And now, let's remove all watches from the previous iteration we don't need anymore */ | |
841 | for (i = 0; i < b->n_inotify_watches; i++) { | |
842 | bool found = false; | |
843 | size_t j; | |
844 | ||
845 | for (j = 0; j < n; j++) | |
846 | if (new_watches[j] == b->inotify_watches[i]) { | |
847 | found = true; | |
848 | break; | |
849 | } | |
850 | ||
851 | if (found) | |
852 | continue; | |
853 | ||
854 | (void) inotify_rm_watch(b->inotify_fd, b->inotify_watches[i]); | |
855 | } | |
856 | ||
857 | free_and_replace(b->inotify_watches, new_watches); | |
858 | b->n_inotify_watches = n; | |
859 | ||
860 | return 0; | |
861 | ||
862 | fail: | |
863 | bus_close_inotify_fd(b); | |
864 | return r; | |
865 | } | |
866 | ||
a7e3212d | 867 | int bus_socket_connect(sd_bus *b) { |
8a5cd31e | 868 | bool inotify_done = false; |
a7e3212d LP |
869 | int r; |
870 | ||
871 | assert(b); | |
a7e3212d | 872 | |
8a5cd31e LP |
873 | for (;;) { |
874 | assert(b->input_fd < 0); | |
875 | assert(b->output_fd < 0); | |
876 | assert(b->sockaddr.sa.sa_family != AF_UNSPEC); | |
a7e3212d | 877 | |
8a5cd31e LP |
878 | b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
879 | if (b->input_fd < 0) | |
880 | return -errno; | |
e82c9509 | 881 | |
8a5cd31e LP |
882 | b->output_fd = b->input_fd; |
883 | bus_socket_setup(b); | |
a7e3212d | 884 | |
8a5cd31e LP |
885 | if (connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size) < 0) { |
886 | if (errno == EINPROGRESS) { | |
a7e3212d | 887 | |
8a5cd31e LP |
888 | /* If we have any inotify watches open, close them now, we don't need them anymore, as |
889 | * we have successfully initiated a connection */ | |
890 | bus_close_inotify_fd(b); | |
891 | ||
892 | /* Note that very likely we are already in BUS_OPENING state here, as we enter it when | |
893 | * we start parsing the address string. The only reason we set the state explicitly | |
894 | * here, is to undo BUS_WATCH_BIND, in case we did the inotify magic. */ | |
3e0e196e | 895 | bus_set_state(b, BUS_OPENING); |
8a5cd31e LP |
896 | return 1; |
897 | } | |
898 | ||
899 | if (IN_SET(errno, ENOENT, ECONNREFUSED) && /* ENOENT → unix socket doesn't exist at all; ECONNREFUSED → unix socket stale */ | |
900 | b->watch_bind && | |
901 | b->sockaddr.sa.sa_family == AF_UNIX && | |
902 | b->sockaddr.un.sun_path[0] != 0) { | |
903 | ||
904 | /* This connection attempt failed, let's release the socket for now, and start with a | |
905 | * fresh one when reconnecting. */ | |
906 | bus_close_io_fds(b); | |
907 | ||
908 | if (inotify_done) { | |
909 | /* inotify set up already, don't do it again, just return now, and remember | |
910 | * that we are waiting for inotify events now. */ | |
3e0e196e | 911 | bus_set_state(b, BUS_WATCH_BIND); |
8a5cd31e LP |
912 | return 1; |
913 | } | |
914 | ||
915 | /* This is a file system socket, and the inotify logic is enabled. Let's create the necessary inotify fd. */ | |
916 | r = bus_socket_inotify_setup(b); | |
917 | if (r < 0) | |
918 | return r; | |
919 | ||
920 | /* Let's now try to connect a second time, because in theory there's otherwise a race | |
921 | * here: the socket might have been created in the time between our first connect() and | |
922 | * the time we set up the inotify logic. But let's remember that we set up inotify now, | |
923 | * so that we don't do the connect() more than twice. */ | |
924 | inotify_done = true; | |
925 | ||
926 | } else | |
927 | return -errno; | |
928 | } else | |
929 | break; | |
a7e3212d LP |
930 | } |
931 | ||
8a5cd31e LP |
932 | /* Yay, established, we don't need no inotify anymore! */ |
933 | bus_close_inotify_fd(b); | |
934 | ||
a7e3212d LP |
935 | return bus_socket_start_auth(b); |
936 | } | |
937 | ||
938 | int bus_socket_exec(sd_bus *b) { | |
e82c9509 | 939 | int s[2], r; |
a7e3212d LP |
940 | |
941 | assert(b); | |
e82c9509 LP |
942 | assert(b->input_fd < 0); |
943 | assert(b->output_fd < 0); | |
a7e3212d | 944 | assert(b->exec_path); |
392cf1d0 | 945 | assert(b->busexec_pid == 0); |
a7e3212d | 946 | |
e82c9509 LP |
947 | r = socketpair(AF_UNIX, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, s); |
948 | if (r < 0) | |
a7e3212d LP |
949 | return -errno; |
950 | ||
392cf1d0 | 951 | r = safe_fork_full("(sd-busexec)", s+1, 1, FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS, &b->busexec_pid); |
4c253ed1 | 952 | if (r < 0) { |
3d94f76c | 953 | safe_close_pair(s); |
4c253ed1 | 954 | return r; |
a7e3212d | 955 | } |
4c253ed1 | 956 | if (r == 0) { |
a7e3212d LP |
957 | /* Child */ |
958 | ||
a7e3212d LP |
959 | assert_se(dup3(s[1], STDIN_FILENO, 0) == STDIN_FILENO); |
960 | assert_se(dup3(s[1], STDOUT_FILENO, 0) == STDOUT_FILENO); | |
961 | ||
945c2931 | 962 | if (!IN_SET(s[1], STDIN_FILENO, STDOUT_FILENO)) |
03e334a1 | 963 | safe_close(s[1]); |
a7e3212d | 964 | |
6ae22ffb LP |
965 | (void) fd_cloexec(STDIN_FILENO, false); |
966 | (void) fd_cloexec(STDOUT_FILENO, false); | |
967 | (void) fd_nonblock(STDIN_FILENO, false); | |
968 | (void) fd_nonblock(STDOUT_FILENO, false); | |
a7e3212d LP |
969 | |
970 | if (b->exec_argv) | |
971 | execvp(b->exec_path, b->exec_argv); | |
972 | else { | |
973 | const char *argv[] = { b->exec_path, NULL }; | |
974 | execvp(b->exec_path, (char**) argv); | |
975 | } | |
976 | ||
977 | _exit(EXIT_FAILURE); | |
978 | } | |
979 | ||
03e334a1 | 980 | safe_close(s[1]); |
e82c9509 | 981 | b->output_fd = b->input_fd = s[0]; |
a7e3212d | 982 | |
8f04d2eb | 983 | bus_socket_setup(b); |
e1d337d4 | 984 | |
a7e3212d LP |
985 | return bus_socket_start_auth(b); |
986 | } | |
987 | ||
988 | int bus_socket_take_fd(sd_bus *b) { | |
a7e3212d LP |
989 | assert(b); |
990 | ||
8f04d2eb | 991 | bus_socket_setup(b); |
a7e3212d LP |
992 | |
993 | return bus_socket_start_auth(b); | |
994 | } | |
995 | ||
996 | int bus_socket_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) { | |
a7e3212d LP |
997 | struct iovec *iov; |
998 | ssize_t k; | |
999 | size_t n; | |
1000 | unsigned j; | |
bc7fd8cd | 1001 | int r; |
a7e3212d LP |
1002 | |
1003 | assert(bus); | |
1004 | assert(m); | |
1005 | assert(idx); | |
945c2931 | 1006 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 1007 | |
6629161f | 1008 | if (*idx >= BUS_MESSAGE_SIZE(m)) |
a7e3212d | 1009 | return 0; |
a7e3212d | 1010 | |
bc7fd8cd LP |
1011 | r = bus_message_setup_iovec(m); |
1012 | if (r < 0) | |
1013 | return r; | |
2100fa10 | 1014 | |
a7e3212d LP |
1015 | n = m->n_iovec * sizeof(struct iovec); |
1016 | iov = alloca(n); | |
75f32f04 | 1017 | memcpy_safe(iov, m->iovec, n); |
a7e3212d LP |
1018 | |
1019 | j = 0; | |
1020 | iovec_advance(iov, &j, *idx); | |
1021 | ||
15d5af81 LP |
1022 | if (bus->prefer_writev) |
1023 | k = writev(bus->output_fd, iov, m->n_iovec); | |
1024 | else { | |
7f4e6a1c ZJS |
1025 | struct msghdr mh = { |
1026 | .msg_iov = iov, | |
1027 | .msg_iovlen = m->n_iovec, | |
1028 | }; | |
15d5af81 | 1029 | |
f29eef2e | 1030 | if (m->n_fds > 0 && *idx == 0) { |
15d5af81 | 1031 | struct cmsghdr *control; |
15d5af81 | 1032 | |
7f4e6a1c ZJS |
1033 | mh.msg_control = control = alloca(CMSG_SPACE(sizeof(int) * m->n_fds)); |
1034 | mh.msg_controllen = control->cmsg_len = CMSG_LEN(sizeof(int) * m->n_fds); | |
15d5af81 LP |
1035 | control->cmsg_level = SOL_SOCKET; |
1036 | control->cmsg_type = SCM_RIGHTS; | |
15d5af81 LP |
1037 | memcpy(CMSG_DATA(control), m->fds, sizeof(int) * m->n_fds); |
1038 | } | |
1039 | ||
15d5af81 LP |
1040 | k = sendmsg(bus->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); |
1041 | if (k < 0 && errno == ENOTSOCK) { | |
1042 | bus->prefer_writev = true; | |
1043 | k = writev(bus->output_fd, iov, m->n_iovec); | |
1044 | } | |
1045 | } | |
a7e3212d | 1046 | |
a7e3212d LP |
1047 | if (k < 0) |
1048 | return errno == EAGAIN ? 0 : -errno; | |
1049 | ||
1050 | *idx += (size_t) k; | |
1051 | return 1; | |
1052 | } | |
1053 | ||
1054 | static int bus_socket_read_message_need(sd_bus *bus, size_t *need) { | |
1055 | uint32_t a, b; | |
1056 | uint8_t e; | |
1057 | uint64_t sum; | |
1058 | ||
1059 | assert(bus); | |
1060 | assert(need); | |
945c2931 | 1061 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1062 | |
1063 | if (bus->rbuffer_size < sizeof(struct bus_header)) { | |
1064 | *need = sizeof(struct bus_header) + 8; | |
1065 | ||
1066 | /* Minimum message size: | |
1067 | * | |
1068 | * Header + | |
1069 | * | |
1070 | * Method Call: +2 string headers | |
1071 | * Signal: +3 string headers | |
1072 | * Method Error: +1 string headers | |
1073 | * +1 uint32 headers | |
1074 | * Method Reply: +1 uint32 headers | |
1075 | * | |
1076 | * A string header is at least 9 bytes | |
1077 | * A uint32 header is at least 8 bytes | |
1078 | * | |
1079 | * Hence the minimum message size of a valid message | |
1080 | * is header + 8 bytes */ | |
1081 | ||
1082 | return 0; | |
1083 | } | |
1084 | ||
1085 | a = ((const uint32_t*) bus->rbuffer)[1]; | |
1086 | b = ((const uint32_t*) bus->rbuffer)[3]; | |
1087 | ||
1088 | e = ((const uint8_t*) bus->rbuffer)[0]; | |
0461f8cd | 1089 | if (e == BUS_LITTLE_ENDIAN) { |
a7e3212d LP |
1090 | a = le32toh(a); |
1091 | b = le32toh(b); | |
0461f8cd | 1092 | } else if (e == BUS_BIG_ENDIAN) { |
a7e3212d LP |
1093 | a = be32toh(a); |
1094 | b = be32toh(b); | |
1095 | } else | |
1096 | return -EBADMSG; | |
1097 | ||
1098 | sum = (uint64_t) sizeof(struct bus_header) + (uint64_t) ALIGN_TO(b, 8) + (uint64_t) a; | |
1099 | if (sum >= BUS_MESSAGE_SIZE_MAX) | |
1100 | return -ENOBUFS; | |
1101 | ||
1102 | *need = (size_t) sum; | |
1103 | return 0; | |
1104 | } | |
1105 | ||
7d22c717 | 1106 | static int bus_socket_make_message(sd_bus *bus, size_t size) { |
a7e3212d LP |
1107 | sd_bus_message *t; |
1108 | void *b; | |
1109 | int r; | |
1110 | ||
1111 | assert(bus); | |
a7e3212d | 1112 | assert(bus->rbuffer_size >= size); |
945c2931 | 1113 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 1114 | |
7adc46fc LP |
1115 | r = bus_rqueue_make_room(bus); |
1116 | if (r < 0) | |
1117 | return r; | |
1118 | ||
a7e3212d LP |
1119 | if (bus->rbuffer_size > size) { |
1120 | b = memdup((const uint8_t*) bus->rbuffer + size, | |
1121 | bus->rbuffer_size - size); | |
1122 | if (!b) | |
1123 | return -ENOMEM; | |
1124 | } else | |
1125 | b = NULL; | |
1126 | ||
df2d202e LP |
1127 | r = bus_message_from_malloc(bus, |
1128 | bus->rbuffer, size, | |
a7e3212d | 1129 | bus->fds, bus->n_fds, |
038f9863 | 1130 | NULL, |
a7e3212d LP |
1131 | &t); |
1132 | if (r < 0) { | |
1133 | free(b); | |
1134 | return r; | |
1135 | } | |
1136 | ||
1137 | bus->rbuffer = b; | |
1138 | bus->rbuffer_size -= size; | |
1139 | ||
1140 | bus->fds = NULL; | |
1141 | bus->n_fds = 0; | |
1142 | ||
7adc46fc | 1143 | bus->rqueue[bus->rqueue_size++] = t; |
7d22c717 | 1144 | |
a7e3212d LP |
1145 | return 1; |
1146 | } | |
1147 | ||
7d22c717 | 1148 | int bus_socket_read_message(sd_bus *bus) { |
a7e3212d | 1149 | struct msghdr mh; |
7f4e6a1c | 1150 | struct iovec iov = {}; |
a7e3212d LP |
1151 | ssize_t k; |
1152 | size_t need; | |
1153 | int r; | |
1154 | void *b; | |
1155 | union { | |
1156 | struct cmsghdr cmsghdr; | |
d868f2a3 | 1157 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
a7e3212d | 1158 | } control; |
4d3a5b10 | 1159 | bool handle_cmsg = false; |
a7e3212d LP |
1160 | |
1161 | assert(bus); | |
945c2931 | 1162 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1163 | |
1164 | r = bus_socket_read_message_need(bus, &need); | |
1165 | if (r < 0) | |
1166 | return r; | |
1167 | ||
1168 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1169 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1170 | |
1171 | b = realloc(bus->rbuffer, need); | |
1172 | if (!b) | |
1173 | return -ENOMEM; | |
1174 | ||
1175 | bus->rbuffer = b; | |
1176 | ||
a7e3212d LP |
1177 | iov.iov_base = (uint8_t*) bus->rbuffer + bus->rbuffer_size; |
1178 | iov.iov_len = need - bus->rbuffer_size; | |
1179 | ||
15d5af81 LP |
1180 | if (bus->prefer_readv) |
1181 | k = readv(bus->input_fd, &iov, 1); | |
1182 | else { | |
1183 | zero(mh); | |
1184 | mh.msg_iov = &iov; | |
1185 | mh.msg_iovlen = 1; | |
1186 | mh.msg_control = &control; | |
1187 | mh.msg_controllen = sizeof(control); | |
1188 | ||
1189 | k = recvmsg(bus->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); | |
1190 | if (k < 0 && errno == ENOTSOCK) { | |
1191 | bus->prefer_readv = true; | |
1192 | k = readv(bus->input_fd, &iov, 1); | |
1193 | } else | |
1194 | handle_cmsg = true; | |
1195 | } | |
a7e3212d LP |
1196 | if (k < 0) |
1197 | return errno == EAGAIN ? 0 : -errno; | |
1198 | if (k == 0) | |
1199 | return -ECONNRESET; | |
1200 | ||
1201 | bus->rbuffer_size += k; | |
1202 | ||
2a1288ff LP |
1203 | if (handle_cmsg) { |
1204 | struct cmsghdr *cmsg; | |
1205 | ||
1206 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
1207 | if (cmsg->cmsg_level == SOL_SOCKET && |
1208 | cmsg->cmsg_type == SCM_RIGHTS) { | |
1209 | int n, *f; | |
1210 | ||
1211 | n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
1212 | ||
1213 | if (!bus->can_fds) { | |
1214 | /* Whut? We received fds but this | |
1215 | * isn't actually enabled? Close them, | |
1216 | * and fail */ | |
1217 | ||
1218 | close_many((int*) CMSG_DATA(cmsg), n); | |
1219 | return -EIO; | |
1220 | } | |
1221 | ||
a0f5ab70 | 1222 | f = realloc(bus->fds, sizeof(int) * (bus->n_fds + n)); |
15d5af81 LP |
1223 | if (!f) { |
1224 | close_many((int*) CMSG_DATA(cmsg), n); | |
1225 | return -ENOMEM; | |
1226 | } | |
1227 | ||
75f32f04 | 1228 | memcpy_safe(f + bus->n_fds, CMSG_DATA(cmsg), n * sizeof(int)); |
15d5af81 LP |
1229 | bus->fds = f; |
1230 | bus->n_fds += n; | |
d868f2a3 ZJS |
1231 | } else |
1232 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
1233 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 1234 | } |
a7e3212d LP |
1235 | |
1236 | r = bus_socket_read_message_need(bus, &need); | |
1237 | if (r < 0) | |
1238 | return r; | |
1239 | ||
1240 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1241 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1242 | |
1243 | return 1; | |
1244 | } | |
1245 | ||
1246 | int bus_socket_process_opening(sd_bus *b) { | |
1247 | int error = 0; | |
1248 | socklen_t slen = sizeof(error); | |
b92bea5d ZJS |
1249 | struct pollfd p = { |
1250 | .fd = b->output_fd, | |
1251 | .events = POLLOUT, | |
1252 | }; | |
a7e3212d LP |
1253 | int r; |
1254 | ||
a7e3212d LP |
1255 | assert(b->state == BUS_OPENING); |
1256 | ||
a7e3212d LP |
1257 | r = poll(&p, 1, 0); |
1258 | if (r < 0) | |
1259 | return -errno; | |
1260 | ||
1261 | if (!(p.revents & (POLLOUT|POLLERR|POLLHUP))) | |
1262 | return 0; | |
1263 | ||
e82c9509 | 1264 | r = getsockopt(b->output_fd, SOL_SOCKET, SO_ERROR, &error, &slen); |
a7e3212d LP |
1265 | if (r < 0) |
1266 | b->last_connect_error = errno; | |
1267 | else if (error != 0) | |
1268 | b->last_connect_error = error; | |
1269 | else if (p.revents & (POLLERR|POLLHUP)) | |
1270 | b->last_connect_error = ECONNREFUSED; | |
1271 | else | |
1272 | return bus_socket_start_auth(b); | |
1273 | ||
1274 | return bus_next_address(b); | |
1275 | } | |
1276 | ||
1277 | int bus_socket_process_authenticating(sd_bus *b) { | |
1278 | int r; | |
1279 | ||
1280 | assert(b); | |
1281 | assert(b->state == BUS_AUTHENTICATING); | |
1282 | ||
1283 | if (now(CLOCK_MONOTONIC) >= b->auth_timeout) | |
1284 | return -ETIMEDOUT; | |
1285 | ||
1286 | r = bus_socket_write_auth(b); | |
1287 | if (r != 0) | |
1288 | return r; | |
1289 | ||
1290 | return bus_socket_read_auth(b); | |
1291 | } | |
8a5cd31e LP |
1292 | |
1293 | int bus_socket_process_watch_bind(sd_bus *b) { | |
1294 | int r, q; | |
1295 | ||
1296 | assert(b); | |
1297 | assert(b->state == BUS_WATCH_BIND); | |
1298 | assert(b->inotify_fd >= 0); | |
1299 | ||
1300 | r = flush_fd(b->inotify_fd); | |
1301 | if (r <= 0) | |
1302 | return r; | |
1303 | ||
1304 | log_debug("Got inotify event on bus %s.", strna(b->description)); | |
1305 | ||
1306 | /* We flushed events out of the inotify fd. In that case, maybe the socket is valid now? Let's try to connect | |
1307 | * to it again */ | |
1308 | ||
1309 | r = bus_socket_connect(b); | |
1310 | if (r < 0) | |
1311 | return r; | |
1312 | ||
1313 | q = bus_attach_io_events(b); | |
1314 | if (q < 0) | |
1315 | return q; | |
1316 | ||
1317 | q = bus_attach_inotify_event(b); | |
1318 | if (q < 0) | |
1319 | return q; | |
1320 | ||
1321 | return r; | |
1322 | } |