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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" |
7fc04b12 | 41 | #include "selinux-util.h" |
24882e06 | 42 | #include "signal-util.h" |
15a5e950 | 43 | #include "stdio-util.h" |
07630cea | 44 | #include "string-util.h" |
b1d4f8e1 | 45 | #include "user-util.h" |
07630cea LP |
46 | #include "utf8.h" |
47 | #include "util.h" | |
a7e3212d | 48 | |
aec6d91f LP |
49 | #define SNDBUF_SIZE (8*1024*1024) |
50 | ||
2181a7f5 | 51 | static void iovec_advance(struct iovec iov[], unsigned *idx, size_t size) { |
a7e3212d LP |
52 | |
53 | while (size > 0) { | |
54 | struct iovec *i = iov + *idx; | |
55 | ||
56 | if (i->iov_len > size) { | |
57 | i->iov_base = (uint8_t*) i->iov_base + size; | |
58 | i->iov_len -= size; | |
59 | return; | |
60 | } | |
61 | ||
62 | size -= i->iov_len; | |
63 | ||
64 | i->iov_base = NULL; | |
65 | i->iov_len = 0; | |
66 | ||
313cefa1 | 67 | (*idx)++; |
a7e3212d LP |
68 | } |
69 | } | |
70 | ||
bc7fd8cd | 71 | static int append_iovec(sd_bus_message *m, const void *p, size_t sz) { |
2100fa10 LP |
72 | assert(m); |
73 | assert(p); | |
74 | assert(sz > 0); | |
75 | ||
76 | m->iovec[m->n_iovec].iov_base = (void*) p; | |
77 | m->iovec[m->n_iovec].iov_len = sz; | |
78 | m->n_iovec++; | |
bc7fd8cd LP |
79 | |
80 | return 0; | |
2100fa10 LP |
81 | } |
82 | ||
bc7fd8cd LP |
83 | static int bus_message_setup_iovec(sd_bus_message *m) { |
84 | struct bus_body_part *part; | |
13c299d3 | 85 | unsigned n, i; |
bc7fd8cd LP |
86 | int r; |
87 | ||
2100fa10 LP |
88 | assert(m); |
89 | assert(m->sealed); | |
90 | ||
91 | if (m->n_iovec > 0) | |
bc7fd8cd LP |
92 | return 0; |
93 | ||
94 | assert(!m->iovec); | |
2100fa10 | 95 | |
c91cb83c | 96 | n = 1 + m->n_body_parts; |
bc7fd8cd LP |
97 | if (n < ELEMENTSOF(m->iovec_fixed)) |
98 | m->iovec = m->iovec_fixed; | |
99 | else { | |
100 | m->iovec = new(struct iovec, n); | |
66b26c5c LP |
101 | if (!m->iovec) { |
102 | r = -ENOMEM; | |
103 | goto fail; | |
104 | } | |
bc7fd8cd | 105 | } |
2100fa10 | 106 | |
c91cb83c | 107 | r = append_iovec(m, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
bc7fd8cd | 108 | if (r < 0) |
66b26c5c | 109 | goto fail; |
2100fa10 | 110 | |
9b29bb68 | 111 | MESSAGE_FOREACH_PART(part, i, m) { |
66b26c5c LP |
112 | r = bus_body_part_map(part); |
113 | if (r < 0) | |
114 | goto fail; | |
115 | ||
bc7fd8cd LP |
116 | r = append_iovec(m, part->data, part->size); |
117 | if (r < 0) | |
66b26c5c | 118 | goto fail; |
bc7fd8cd LP |
119 | } |
120 | ||
121 | assert(n == m->n_iovec); | |
122 | ||
123 | return 0; | |
66b26c5c LP |
124 | |
125 | fail: | |
126 | m->poisoned = true; | |
127 | return r; | |
2100fa10 LP |
128 | } |
129 | ||
2181a7f5 LP |
130 | bool bus_socket_auth_needs_write(sd_bus *b) { |
131 | ||
132 | unsigned i; | |
133 | ||
134 | if (b->auth_index >= ELEMENTSOF(b->auth_iovec)) | |
135 | return false; | |
136 | ||
137 | for (i = b->auth_index; i < ELEMENTSOF(b->auth_iovec); i++) { | |
138 | struct iovec *j = b->auth_iovec + i; | |
139 | ||
140 | if (j->iov_len > 0) | |
141 | return true; | |
142 | } | |
143 | ||
144 | return false; | |
145 | } | |
146 | ||
a7e3212d | 147 | static int bus_socket_write_auth(sd_bus *b) { |
a7e3212d LP |
148 | ssize_t k; |
149 | ||
150 | assert(b); | |
151 | assert(b->state == BUS_AUTHENTICATING); | |
152 | ||
2181a7f5 | 153 | if (!bus_socket_auth_needs_write(b)) |
a7e3212d LP |
154 | return 0; |
155 | ||
15d5af81 LP |
156 | if (b->prefer_writev) |
157 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
158 | else { | |
159 | struct msghdr mh; | |
160 | zero(mh); | |
161 | ||
162 | mh.msg_iov = b->auth_iovec + b->auth_index; | |
163 | mh.msg_iovlen = ELEMENTSOF(b->auth_iovec) - b->auth_index; | |
164 | ||
165 | k = sendmsg(b->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
166 | if (k < 0 && errno == ENOTSOCK) { | |
167 | b->prefer_writev = true; | |
168 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
169 | } | |
170 | } | |
a7e3212d | 171 | |
a7e3212d LP |
172 | if (k < 0) |
173 | return errno == EAGAIN ? 0 : -errno; | |
174 | ||
175 | iovec_advance(b->auth_iovec, &b->auth_index, (size_t) k); | |
a7e3212d LP |
176 | return 1; |
177 | } | |
178 | ||
2181a7f5 | 179 | static int bus_socket_auth_verify_client(sd_bus *b) { |
a7e3212d LP |
180 | char *e, *f, *start; |
181 | sd_id128_t peer; | |
182 | unsigned i; | |
183 | int r; | |
184 | ||
2181a7f5 LP |
185 | assert(b); |
186 | ||
a7e3212d LP |
187 | /* We expect two response lines: "OK" and possibly |
188 | * "AGREE_UNIX_FD" */ | |
189 | ||
6e6c21c8 | 190 | e = memmem_safe(b->rbuffer, b->rbuffer_size, "\r\n", 2); |
a7e3212d LP |
191 | if (!e) |
192 | return 0; | |
193 | ||
c7db1984 | 194 | if (b->accept_fd) { |
a7e3212d LP |
195 | f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2); |
196 | if (!f) | |
197 | return 0; | |
198 | ||
199 | start = f + 2; | |
200 | } else { | |
201 | f = NULL; | |
202 | start = e + 2; | |
203 | } | |
204 | ||
205 | /* Nice! We got all the lines we need. First check the OK | |
206 | * line */ | |
207 | ||
208 | if (e - (char*) b->rbuffer != 3 + 32) | |
209 | return -EPERM; | |
210 | ||
211 | if (memcmp(b->rbuffer, "OK ", 3)) | |
212 | return -EPERM; | |
213 | ||
2181a7f5 LP |
214 | b->auth = b->anonymous_auth ? BUS_AUTH_ANONYMOUS : BUS_AUTH_EXTERNAL; |
215 | ||
a7e3212d LP |
216 | for (i = 0; i < 32; i += 2) { |
217 | int x, y; | |
218 | ||
219 | x = unhexchar(((char*) b->rbuffer)[3 + i]); | |
220 | y = unhexchar(((char*) b->rbuffer)[3 + i + 1]); | |
221 | ||
222 | if (x < 0 || y < 0) | |
223 | return -EINVAL; | |
224 | ||
225 | peer.bytes[i/2] = ((uint8_t) x << 4 | (uint8_t) y); | |
226 | } | |
227 | ||
3bbaff3e | 228 | if (!sd_id128_is_null(b->server_id) && |
98178d39 | 229 | !sd_id128_equal(b->server_id, peer)) |
a7e3212d LP |
230 | return -EPERM; |
231 | ||
98178d39 | 232 | b->server_id = peer; |
a7e3212d LP |
233 | |
234 | /* And possibly check the second line, too */ | |
235 | ||
236 | if (f) | |
237 | b->can_fds = | |
fbd0b64f LP |
238 | (f - e == STRLEN("\r\nAGREE_UNIX_FD")) && |
239 | memcmp(e + 2, "AGREE_UNIX_FD", | |
240 | STRLEN("AGREE_UNIX_FD")) == 0; | |
a7e3212d LP |
241 | |
242 | b->rbuffer_size -= (start - (char*) b->rbuffer); | |
243 | memmove(b->rbuffer, start, b->rbuffer_size); | |
244 | ||
245 | r = bus_start_running(b); | |
246 | if (r < 0) | |
247 | return r; | |
248 | ||
249 | return 1; | |
250 | } | |
251 | ||
2181a7f5 LP |
252 | static bool line_equals(const char *s, size_t m, const char *line) { |
253 | size_t l; | |
254 | ||
255 | l = strlen(line); | |
256 | if (l != m) | |
257 | return false; | |
258 | ||
259 | return memcmp(s, line, l) == 0; | |
260 | } | |
261 | ||
262 | static bool line_begins(const char *s, size_t m, const char *word) { | |
263 | size_t l; | |
264 | ||
265 | l = strlen(word); | |
266 | if (m < l) | |
267 | return false; | |
268 | ||
269 | if (memcmp(s, word, l) != 0) | |
270 | return false; | |
271 | ||
272 | return m == l || (m > l && s[l] == ' '); | |
273 | } | |
274 | ||
275 | static int verify_anonymous_token(sd_bus *b, const char *p, size_t l) { | |
276 | _cleanup_free_ char *token = NULL; | |
30494563 TG |
277 | size_t len; |
278 | int r; | |
2181a7f5 LP |
279 | |
280 | if (!b->anonymous_auth) | |
281 | return 0; | |
282 | ||
283 | if (l <= 0) | |
284 | return 1; | |
285 | ||
286 | assert(p[0] == ' '); | |
287 | p++; l--; | |
288 | ||
289 | if (l % 2 != 0) | |
290 | return 0; | |
2181a7f5 | 291 | |
30494563 TG |
292 | r = unhexmem(p, l, (void **) &token, &len); |
293 | if (r < 0) | |
294 | return 0; | |
295 | ||
296 | if (memchr(token, 0, len)) | |
2181a7f5 LP |
297 | return 0; |
298 | ||
299 | return !!utf8_is_valid(token); | |
300 | } | |
301 | ||
302 | static int verify_external_token(sd_bus *b, const char *p, size_t l) { | |
303 | _cleanup_free_ char *token = NULL; | |
30494563 | 304 | size_t len; |
2181a7f5 LP |
305 | uid_t u; |
306 | int r; | |
307 | ||
308 | /* We don't do any real authentication here. Instead, we if | |
309 | * the owner of this bus wanted authentication he should have | |
310 | * checked SO_PEERCRED before even creating the bus object. */ | |
311 | ||
8411d2a2 | 312 | if (!b->anonymous_auth && !b->ucred_valid) |
2181a7f5 LP |
313 | return 0; |
314 | ||
315 | if (l <= 0) | |
316 | return 1; | |
317 | ||
318 | assert(p[0] == ' '); | |
319 | p++; l--; | |
320 | ||
321 | if (l % 2 != 0) | |
322 | return 0; | |
323 | ||
30494563 TG |
324 | r = unhexmem(p, l, (void**) &token, &len); |
325 | if (r < 0) | |
326 | return 0; | |
2181a7f5 | 327 | |
30494563 | 328 | if (memchr(token, 0, len)) |
2181a7f5 LP |
329 | return 0; |
330 | ||
331 | r = parse_uid(token, &u); | |
332 | if (r < 0) | |
333 | return 0; | |
334 | ||
8411d2a2 LP |
335 | /* We ignore the passed value if anonymous authentication is |
336 | * on anyway. */ | |
337 | if (!b->anonymous_auth && u != b->ucred.uid) | |
2181a7f5 LP |
338 | return 0; |
339 | ||
340 | return 1; | |
341 | } | |
342 | ||
343 | static int bus_socket_auth_write(sd_bus *b, const char *t) { | |
344 | char *p; | |
345 | size_t l; | |
346 | ||
347 | assert(b); | |
348 | assert(t); | |
349 | ||
350 | /* We only make use of the first iovec */ | |
945c2931 | 351 | assert(IN_SET(b->auth_index, 0, 1)); |
2181a7f5 LP |
352 | |
353 | l = strlen(t); | |
354 | p = malloc(b->auth_iovec[0].iov_len + l); | |
355 | if (!p) | |
356 | return -ENOMEM; | |
357 | ||
75f32f04 | 358 | memcpy_safe(p, b->auth_iovec[0].iov_base, b->auth_iovec[0].iov_len); |
2181a7f5 LP |
359 | memcpy(p + b->auth_iovec[0].iov_len, t, l); |
360 | ||
361 | b->auth_iovec[0].iov_base = p; | |
362 | b->auth_iovec[0].iov_len += l; | |
363 | ||
364 | free(b->auth_buffer); | |
365 | b->auth_buffer = p; | |
366 | b->auth_index = 0; | |
367 | return 0; | |
368 | } | |
369 | ||
370 | static int bus_socket_auth_write_ok(sd_bus *b) { | |
371 | char t[3 + 32 + 2 + 1]; | |
372 | ||
373 | assert(b); | |
374 | ||
5ffa8c81 | 375 | xsprintf(t, "OK " SD_ID128_FORMAT_STR "\r\n", SD_ID128_FORMAT_VAL(b->server_id)); |
2181a7f5 LP |
376 | |
377 | return bus_socket_auth_write(b, t); | |
378 | } | |
379 | ||
380 | static int bus_socket_auth_verify_server(sd_bus *b) { | |
381 | char *e; | |
382 | const char *line; | |
383 | size_t l; | |
384 | bool processed = false; | |
385 | int r; | |
386 | ||
387 | assert(b); | |
388 | ||
2b4ac889 | 389 | if (b->rbuffer_size < 1) |
2181a7f5 LP |
390 | return 0; |
391 | ||
392 | /* First char must be a NUL byte */ | |
393 | if (*(char*) b->rbuffer != 0) | |
394 | return -EIO; | |
395 | ||
2b4ac889 LP |
396 | if (b->rbuffer_size < 3) |
397 | return 0; | |
398 | ||
2181a7f5 LP |
399 | /* Begin with the first line */ |
400 | if (b->auth_rbegin <= 0) | |
401 | b->auth_rbegin = 1; | |
402 | ||
403 | for (;;) { | |
404 | /* Check if line is complete */ | |
405 | line = (char*) b->rbuffer + b->auth_rbegin; | |
406 | e = memmem(line, b->rbuffer_size - b->auth_rbegin, "\r\n", 2); | |
407 | if (!e) | |
408 | return processed; | |
409 | ||
410 | l = e - line; | |
411 | ||
412 | if (line_begins(line, l, "AUTH ANONYMOUS")) { | |
413 | ||
414 | r = verify_anonymous_token(b, line + 14, l - 14); | |
415 | if (r < 0) | |
416 | return r; | |
417 | if (r == 0) | |
418 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
419 | else { | |
420 | b->auth = BUS_AUTH_ANONYMOUS; | |
421 | r = bus_socket_auth_write_ok(b); | |
422 | } | |
423 | ||
424 | } else if (line_begins(line, l, "AUTH EXTERNAL")) { | |
425 | ||
426 | r = verify_external_token(b, line + 13, l - 13); | |
427 | if (r < 0) | |
428 | return r; | |
429 | if (r == 0) | |
430 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
431 | else { | |
432 | b->auth = BUS_AUTH_EXTERNAL; | |
433 | r = bus_socket_auth_write_ok(b); | |
434 | } | |
435 | ||
436 | } else if (line_begins(line, l, "AUTH")) | |
437 | r = bus_socket_auth_write(b, "REJECTED EXTERNAL ANONYMOUS\r\n"); | |
438 | else if (line_equals(line, l, "CANCEL") || | |
439 | line_begins(line, l, "ERROR")) { | |
440 | ||
441 | b->auth = _BUS_AUTH_INVALID; | |
442 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
443 | ||
444 | } else if (line_equals(line, l, "BEGIN")) { | |
445 | ||
446 | if (b->auth == _BUS_AUTH_INVALID) | |
447 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
448 | else { | |
449 | /* We can't leave from the auth phase | |
450 | * before we haven't written | |
451 | * everything queued, so let's check | |
452 | * that */ | |
453 | ||
454 | if (bus_socket_auth_needs_write(b)) | |
455 | return 1; | |
456 | ||
457 | b->rbuffer_size -= (e + 2 - (char*) b->rbuffer); | |
458 | memmove(b->rbuffer, e + 2, b->rbuffer_size); | |
459 | return bus_start_running(b); | |
460 | } | |
461 | ||
462 | } else if (line_begins(line, l, "DATA")) { | |
463 | ||
464 | if (b->auth == _BUS_AUTH_INVALID) | |
465 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
466 | else { | |
467 | if (b->auth == BUS_AUTH_ANONYMOUS) | |
468 | r = verify_anonymous_token(b, line + 4, l - 4); | |
469 | else | |
470 | r = verify_external_token(b, line + 4, l - 4); | |
471 | ||
472 | if (r < 0) | |
473 | return r; | |
474 | if (r == 0) { | |
475 | b->auth = _BUS_AUTH_INVALID; | |
476 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
477 | } else | |
478 | r = bus_socket_auth_write_ok(b); | |
479 | } | |
480 | } else if (line_equals(line, l, "NEGOTIATE_UNIX_FD")) { | |
c7db1984 | 481 | if (b->auth == _BUS_AUTH_INVALID || !b->accept_fd) |
2181a7f5 LP |
482 | r = bus_socket_auth_write(b, "ERROR\r\n"); |
483 | else { | |
484 | b->can_fds = true; | |
485 | r = bus_socket_auth_write(b, "AGREE_UNIX_FD\r\n"); | |
486 | } | |
487 | } else | |
488 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
489 | ||
490 | if (r < 0) | |
491 | return r; | |
492 | ||
493 | b->auth_rbegin = e + 2 - (char*) b->rbuffer; | |
494 | ||
495 | processed = true; | |
496 | } | |
497 | } | |
498 | ||
499 | static int bus_socket_auth_verify(sd_bus *b) { | |
500 | assert(b); | |
501 | ||
502 | if (b->is_server) | |
503 | return bus_socket_auth_verify_server(b); | |
504 | else | |
505 | return bus_socket_auth_verify_client(b); | |
506 | } | |
507 | ||
a7e3212d LP |
508 | static int bus_socket_read_auth(sd_bus *b) { |
509 | struct msghdr mh; | |
7f4e6a1c | 510 | struct iovec iov = {}; |
a7e3212d LP |
511 | size_t n; |
512 | ssize_t k; | |
513 | int r; | |
514 | void *p; | |
2181a7f5 LP |
515 | union { |
516 | struct cmsghdr cmsghdr; | |
d868f2a3 | 517 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
2181a7f5 | 518 | } control; |
15d5af81 | 519 | bool handle_cmsg = false; |
a7e3212d LP |
520 | |
521 | assert(b); | |
2181a7f5 | 522 | assert(b->state == BUS_AUTHENTICATING); |
a7e3212d LP |
523 | |
524 | r = bus_socket_auth_verify(b); | |
525 | if (r != 0) | |
526 | return r; | |
527 | ||
9607d947 | 528 | n = MAX(256u, b->rbuffer_size * 2); |
a7e3212d LP |
529 | |
530 | if (n > BUS_AUTH_SIZE_MAX) | |
531 | n = BUS_AUTH_SIZE_MAX; | |
532 | ||
533 | if (b->rbuffer_size >= n) | |
534 | return -ENOBUFS; | |
535 | ||
536 | p = realloc(b->rbuffer, n); | |
537 | if (!p) | |
538 | return -ENOMEM; | |
539 | ||
540 | b->rbuffer = p; | |
541 | ||
a7e3212d LP |
542 | iov.iov_base = (uint8_t*) b->rbuffer + b->rbuffer_size; |
543 | iov.iov_len = n - b->rbuffer_size; | |
544 | ||
15d5af81 LP |
545 | if (b->prefer_readv) |
546 | k = readv(b->input_fd, &iov, 1); | |
547 | else { | |
548 | zero(mh); | |
549 | mh.msg_iov = &iov; | |
550 | mh.msg_iovlen = 1; | |
551 | mh.msg_control = &control; | |
552 | mh.msg_controllen = sizeof(control); | |
553 | ||
554 | k = recvmsg(b->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); | |
555 | if (k < 0 && errno == ENOTSOCK) { | |
556 | b->prefer_readv = true; | |
557 | k = readv(b->input_fd, &iov, 1); | |
558 | } else | |
559 | handle_cmsg = true; | |
560 | } | |
a7e3212d LP |
561 | if (k < 0) |
562 | return errno == EAGAIN ? 0 : -errno; | |
563 | if (k == 0) | |
564 | return -ECONNRESET; | |
565 | ||
566 | b->rbuffer_size += k; | |
567 | ||
2a1288ff LP |
568 | if (handle_cmsg) { |
569 | struct cmsghdr *cmsg; | |
570 | ||
571 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
572 | if (cmsg->cmsg_level == SOL_SOCKET && |
573 | cmsg->cmsg_type == SCM_RIGHTS) { | |
574 | int j; | |
575 | ||
576 | /* Whut? We received fds during the auth | |
577 | * protocol? Somebody is playing games with | |
578 | * us. Close them all, and fail */ | |
579 | j = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
580 | close_many((int*) CMSG_DATA(cmsg), j); | |
581 | return -EIO; | |
d868f2a3 ZJS |
582 | } else |
583 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
584 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 585 | } |
2181a7f5 | 586 | |
a7e3212d LP |
587 | r = bus_socket_auth_verify(b); |
588 | if (r != 0) | |
589 | return r; | |
590 | ||
591 | return 1; | |
592 | } | |
593 | ||
8f04d2eb | 594 | void bus_socket_setup(sd_bus *b) { |
a7e3212d LP |
595 | assert(b); |
596 | ||
aec6d91f | 597 | /* Increase the buffers to 8 MB */ |
6ae22ffb LP |
598 | (void) fd_inc_rcvbuf(b->input_fd, SNDBUF_SIZE); |
599 | (void) fd_inc_sndbuf(b->output_fd, SNDBUF_SIZE); | |
a7e3212d | 600 | |
e1d337d4 | 601 | b->message_version = 1; |
0f437184 | 602 | b->message_endian = 0; |
8f04d2eb | 603 | } |
e1d337d4 | 604 | |
8f04d2eb | 605 | static void bus_get_peercred(sd_bus *b) { |
c4e6556c ZJS |
606 | int r; |
607 | ||
8f04d2eb | 608 | assert(b); |
18ac4643 LP |
609 | assert(!b->ucred_valid); |
610 | assert(!b->label); | |
611 | assert(b->n_groups == (size_t) -1); | |
8f04d2eb LP |
612 | |
613 | /* Get the peer for socketpair() sockets */ | |
eff05270 | 614 | b->ucred_valid = getpeercred(b->input_fd, &b->ucred) >= 0; |
c4e6556c ZJS |
615 | |
616 | /* Get the SELinux context of the peer */ | |
db7d1dca | 617 | r = getpeersec(b->input_fd, &b->label); |
18ac4643 | 618 | if (r < 0 && !IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) |
db7d1dca | 619 | log_debug_errno(r, "Failed to determine peer security context: %m"); |
18ac4643 LP |
620 | |
621 | /* Get the list of auxiliary groups of the peer */ | |
622 | r = getpeergroups(b->input_fd, &b->groups); | |
623 | if (r < 0) { | |
624 | if (!IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) | |
625 | log_debug_errno(r, "Failed to determine peer groups list: %m"); | |
626 | ||
627 | b->n_groups = (size_t) -1; | |
628 | } else | |
629 | b->n_groups = (size_t) r; | |
a7e3212d LP |
630 | } |
631 | ||
2181a7f5 | 632 | static int bus_socket_start_auth_client(sd_bus *b) { |
a7e3212d | 633 | size_t l; |
2181a7f5 | 634 | const char *auth_suffix, *auth_prefix; |
a7e3212d LP |
635 | |
636 | assert(b); | |
637 | ||
2181a7f5 LP |
638 | if (b->anonymous_auth) { |
639 | auth_prefix = "\0AUTH ANONYMOUS "; | |
a7e3212d | 640 | |
2181a7f5 LP |
641 | /* For ANONYMOUS auth we send some arbitrary "trace" string */ |
642 | l = 9; | |
643 | b->auth_buffer = hexmem("anonymous", l); | |
644 | } else { | |
5ffa8c81 | 645 | char text[DECIMAL_STR_MAX(uid_t) + 1]; |
a7e3212d | 646 | |
2181a7f5 | 647 | auth_prefix = "\0AUTH EXTERNAL "; |
a7e3212d | 648 | |
5ffa8c81 | 649 | xsprintf(text, UID_FMT, geteuid()); |
a7e3212d | 650 | |
2181a7f5 LP |
651 | l = strlen(text); |
652 | b->auth_buffer = hexmem(text, l); | |
653 | } | |
654 | ||
655 | if (!b->auth_buffer) | |
a7e3212d LP |
656 | return -ENOMEM; |
657 | ||
c7db1984 | 658 | if (b->accept_fd) |
2181a7f5 LP |
659 | auth_suffix = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n"; |
660 | else | |
661 | auth_suffix = "\r\nBEGIN\r\n"; | |
a7e3212d LP |
662 | |
663 | b->auth_iovec[0].iov_base = (void*) auth_prefix; | |
2181a7f5 LP |
664 | b->auth_iovec[0].iov_len = 1 + strlen(auth_prefix + 1); |
665 | b->auth_iovec[1].iov_base = (void*) b->auth_buffer; | |
a7e3212d LP |
666 | b->auth_iovec[1].iov_len = l * 2; |
667 | b->auth_iovec[2].iov_base = (void*) auth_suffix; | |
668 | b->auth_iovec[2].iov_len = strlen(auth_suffix); | |
a7e3212d LP |
669 | |
670 | return bus_socket_write_auth(b); | |
671 | } | |
672 | ||
a7893c6b | 673 | int bus_socket_start_auth(sd_bus *b) { |
2181a7f5 LP |
674 | assert(b); |
675 | ||
8f04d2eb LP |
676 | bus_get_peercred(b); |
677 | ||
2181a7f5 | 678 | b->state = BUS_AUTHENTICATING; |
036d61b3 | 679 | b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_AUTH_TIMEOUT; |
2181a7f5 | 680 | |
9ab32f9d | 681 | if (sd_is_socket(b->input_fd, AF_UNIX, 0, 0) <= 0) |
c7db1984 | 682 | b->accept_fd = false; |
2181a7f5 | 683 | |
9ab32f9d LP |
684 | if (b->output_fd != b->input_fd) |
685 | if (sd_is_socket(b->output_fd, AF_UNIX, 0, 0) <= 0) | |
c7db1984 | 686 | b->accept_fd = false; |
e82c9509 | 687 | |
2181a7f5 LP |
688 | if (b->is_server) |
689 | return bus_socket_read_auth(b); | |
690 | else | |
691 | return bus_socket_start_auth_client(b); | |
692 | } | |
693 | ||
8a5cd31e LP |
694 | static int bus_socket_inotify_setup(sd_bus *b) { |
695 | _cleanup_free_ int *new_watches = NULL; | |
696 | _cleanup_free_ char *absolute = NULL; | |
697 | size_t n_allocated = 0, n = 0, done = 0, i; | |
698 | unsigned max_follow = 32; | |
699 | const char *p; | |
700 | int wd, r; | |
701 | ||
702 | assert(b); | |
703 | assert(b->watch_bind); | |
704 | assert(b->sockaddr.sa.sa_family == AF_UNIX); | |
705 | assert(b->sockaddr.un.sun_path[0] != 0); | |
706 | ||
707 | /* Sets up an inotify fd in case watch_bind is enabled: wait until the configured AF_UNIX file system socket | |
708 | * appears before connecting to it. The implemented is pretty simplistic: we just subscribe to relevant changes | |
709 | * to all prefix components of the path, and every time we get an event for that we try to reconnect again, | |
710 | * without actually caring what precisely the event we got told us. If we still can't connect we re-subscribe | |
711 | * to all relevant changes of anything in the path, so that our watches include any possibly newly created path | |
712 | * components. */ | |
713 | ||
714 | if (b->inotify_fd < 0) { | |
715 | b->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
716 | if (b->inotify_fd < 0) | |
717 | return -errno; | |
718 | } | |
719 | ||
720 | /* Make sure the path is NUL terminated */ | |
721 | p = strndupa(b->sockaddr.un.sun_path, sizeof(b->sockaddr.un.sun_path)); | |
722 | ||
723 | /* Make sure the path is absolute */ | |
724 | r = path_make_absolute_cwd(p, &absolute); | |
725 | if (r < 0) | |
726 | goto fail; | |
727 | ||
728 | /* Watch all parent directories, and don't mind any prefix that doesn't exist yet. For the innermost directory | |
729 | * that exists we want to know when files are created or moved into it. For all parents of it we just care if | |
730 | * they are removed or renamed. */ | |
731 | ||
732 | if (!GREEDY_REALLOC(new_watches, n_allocated, n + 1)) { | |
733 | r = -ENOMEM; | |
734 | goto fail; | |
735 | } | |
736 | ||
737 | /* Start with the top-level directory, which is a bit simpler than the rest, since it can't be a symlink, and | |
738 | * always exists */ | |
739 | wd = inotify_add_watch(b->inotify_fd, "/", IN_CREATE|IN_MOVED_TO); | |
740 | if (wd < 0) { | |
741 | r = log_debug_errno(errno, "Failed to add inotify watch on /: %m"); | |
742 | goto fail; | |
743 | } else | |
744 | new_watches[n++] = wd; | |
745 | ||
746 | for (;;) { | |
747 | _cleanup_free_ char *component = NULL, *prefix = NULL, *destination = NULL; | |
748 | size_t n_slashes, n_component; | |
749 | char *c = NULL; | |
750 | ||
751 | n_slashes = strspn(absolute + done, "/"); | |
752 | n_component = n_slashes + strcspn(absolute + done + n_slashes, "/"); | |
753 | ||
754 | if (n_component == 0) /* The end */ | |
755 | break; | |
756 | ||
757 | component = strndup(absolute + done, n_component); | |
758 | if (!component) { | |
759 | r = -ENOMEM; | |
760 | goto fail; | |
761 | } | |
762 | ||
763 | /* A trailing slash? That's a directory, and not a socket then */ | |
764 | if (path_equal(component, "/")) { | |
765 | r = -EISDIR; | |
766 | goto fail; | |
767 | } | |
768 | ||
769 | /* A single dot? Let's eat this up */ | |
770 | if (path_equal(component, "/.")) { | |
771 | done += n_component; | |
772 | continue; | |
773 | } | |
774 | ||
775 | prefix = strndup(absolute, done + n_component); | |
776 | if (!prefix) { | |
777 | r = -ENOMEM; | |
778 | goto fail; | |
779 | } | |
780 | ||
781 | if (!GREEDY_REALLOC(new_watches, n_allocated, n + 1)) { | |
782 | r = -ENOMEM; | |
783 | goto fail; | |
784 | } | |
785 | ||
786 | wd = inotify_add_watch(b->inotify_fd, prefix, IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO|IN_DONT_FOLLOW); | |
787 | log_debug("Added inotify watch for %s on bus %s: %i", prefix, strna(b->description), wd); | |
788 | ||
789 | if (wd < 0) { | |
790 | if (IN_SET(errno, ENOENT, ELOOP)) | |
791 | break; /* This component doesn't exist yet, or the path contains a cyclic symlink right now */ | |
792 | ||
793 | r = log_debug_errno(errno, "Failed to add inotify watch on %s: %m", isempty(prefix) ? "/" : prefix); | |
794 | goto fail; | |
795 | } else | |
796 | new_watches[n++] = wd; | |
797 | ||
798 | /* Check if this is possibly a symlink. If so, let's follow it and watch it too. */ | |
799 | r = readlink_malloc(prefix, &destination); | |
800 | if (r == -EINVAL) { /* not a symlink */ | |
801 | done += n_component; | |
802 | continue; | |
803 | } | |
804 | if (r < 0) | |
805 | goto fail; | |
806 | ||
807 | if (isempty(destination)) { /* Empty symlink target? Yuck! */ | |
808 | r = -EINVAL; | |
809 | goto fail; | |
810 | } | |
811 | ||
812 | if (max_follow <= 0) { /* Let's make sure we don't follow symlinks forever */ | |
813 | r = -ELOOP; | |
814 | goto fail; | |
815 | } | |
816 | ||
817 | if (path_is_absolute(destination)) { | |
818 | /* For absolute symlinks we build the new path and start anew */ | |
819 | c = strjoin(destination, absolute + done + n_component); | |
820 | done = 0; | |
821 | } else { | |
822 | _cleanup_free_ char *t = NULL; | |
823 | ||
824 | /* For relative symlinks we replace the last component, and try again */ | |
825 | t = strndup(absolute, done); | |
826 | if (!t) | |
827 | return -ENOMEM; | |
828 | ||
829 | c = strjoin(t, "/", destination, absolute + done + n_component); | |
830 | } | |
831 | if (!c) { | |
832 | r = -ENOMEM; | |
833 | goto fail; | |
834 | } | |
835 | ||
836 | free(absolute); | |
837 | absolute = c; | |
838 | ||
839 | max_follow--; | |
840 | } | |
841 | ||
842 | /* And now, let's remove all watches from the previous iteration we don't need anymore */ | |
843 | for (i = 0; i < b->n_inotify_watches; i++) { | |
844 | bool found = false; | |
845 | size_t j; | |
846 | ||
847 | for (j = 0; j < n; j++) | |
848 | if (new_watches[j] == b->inotify_watches[i]) { | |
849 | found = true; | |
850 | break; | |
851 | } | |
852 | ||
853 | if (found) | |
854 | continue; | |
855 | ||
856 | (void) inotify_rm_watch(b->inotify_fd, b->inotify_watches[i]); | |
857 | } | |
858 | ||
859 | free_and_replace(b->inotify_watches, new_watches); | |
860 | b->n_inotify_watches = n; | |
861 | ||
862 | return 0; | |
863 | ||
864 | fail: | |
865 | bus_close_inotify_fd(b); | |
866 | return r; | |
867 | } | |
868 | ||
a7e3212d | 869 | int bus_socket_connect(sd_bus *b) { |
8a5cd31e | 870 | bool inotify_done = false; |
a7e3212d LP |
871 | int r; |
872 | ||
873 | assert(b); | |
a7e3212d | 874 | |
8a5cd31e LP |
875 | for (;;) { |
876 | assert(b->input_fd < 0); | |
877 | assert(b->output_fd < 0); | |
878 | assert(b->sockaddr.sa.sa_family != AF_UNSPEC); | |
a7e3212d | 879 | |
8a5cd31e LP |
880 | b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
881 | if (b->input_fd < 0) | |
882 | return -errno; | |
e82c9509 | 883 | |
8a5cd31e LP |
884 | b->output_fd = b->input_fd; |
885 | bus_socket_setup(b); | |
a7e3212d | 886 | |
8a5cd31e LP |
887 | if (connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size) < 0) { |
888 | if (errno == EINPROGRESS) { | |
a7e3212d | 889 | |
8a5cd31e LP |
890 | /* If we have any inotify watches open, close them now, we don't need them anymore, as |
891 | * we have successfully initiated a connection */ | |
892 | bus_close_inotify_fd(b); | |
893 | ||
894 | /* Note that very likely we are already in BUS_OPENING state here, as we enter it when | |
895 | * we start parsing the address string. The only reason we set the state explicitly | |
896 | * here, is to undo BUS_WATCH_BIND, in case we did the inotify magic. */ | |
897 | b->state = BUS_OPENING; | |
898 | return 1; | |
899 | } | |
900 | ||
901 | if (IN_SET(errno, ENOENT, ECONNREFUSED) && /* ENOENT → unix socket doesn't exist at all; ECONNREFUSED → unix socket stale */ | |
902 | b->watch_bind && | |
903 | b->sockaddr.sa.sa_family == AF_UNIX && | |
904 | b->sockaddr.un.sun_path[0] != 0) { | |
905 | ||
906 | /* This connection attempt failed, let's release the socket for now, and start with a | |
907 | * fresh one when reconnecting. */ | |
908 | bus_close_io_fds(b); | |
909 | ||
910 | if (inotify_done) { | |
911 | /* inotify set up already, don't do it again, just return now, and remember | |
912 | * that we are waiting for inotify events now. */ | |
913 | b->state = BUS_WATCH_BIND; | |
914 | return 1; | |
915 | } | |
916 | ||
917 | /* This is a file system socket, and the inotify logic is enabled. Let's create the necessary inotify fd. */ | |
918 | r = bus_socket_inotify_setup(b); | |
919 | if (r < 0) | |
920 | return r; | |
921 | ||
922 | /* Let's now try to connect a second time, because in theory there's otherwise a race | |
923 | * here: the socket might have been created in the time between our first connect() and | |
924 | * the time we set up the inotify logic. But let's remember that we set up inotify now, | |
925 | * so that we don't do the connect() more than twice. */ | |
926 | inotify_done = true; | |
927 | ||
928 | } else | |
929 | return -errno; | |
930 | } else | |
931 | break; | |
a7e3212d LP |
932 | } |
933 | ||
8a5cd31e LP |
934 | /* Yay, established, we don't need no inotify anymore! */ |
935 | bus_close_inotify_fd(b); | |
936 | ||
a7e3212d LP |
937 | return bus_socket_start_auth(b); |
938 | } | |
939 | ||
940 | int bus_socket_exec(sd_bus *b) { | |
e82c9509 | 941 | int s[2], r; |
a7e3212d LP |
942 | pid_t pid; |
943 | ||
944 | assert(b); | |
e82c9509 LP |
945 | assert(b->input_fd < 0); |
946 | assert(b->output_fd < 0); | |
a7e3212d LP |
947 | assert(b->exec_path); |
948 | ||
e82c9509 LP |
949 | r = socketpair(AF_UNIX, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, s); |
950 | if (r < 0) | |
a7e3212d LP |
951 | return -errno; |
952 | ||
4c253ed1 LP |
953 | r = safe_fork_full("(sd-busexec)", s+1, 1, FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS, &pid); |
954 | if (r < 0) { | |
3d94f76c | 955 | safe_close_pair(s); |
4c253ed1 | 956 | return r; |
a7e3212d | 957 | } |
4c253ed1 | 958 | if (r == 0) { |
a7e3212d LP |
959 | /* Child */ |
960 | ||
a7e3212d LP |
961 | assert_se(dup3(s[1], STDIN_FILENO, 0) == STDIN_FILENO); |
962 | assert_se(dup3(s[1], STDOUT_FILENO, 0) == STDOUT_FILENO); | |
963 | ||
945c2931 | 964 | if (!IN_SET(s[1], STDIN_FILENO, STDOUT_FILENO)) |
03e334a1 | 965 | safe_close(s[1]); |
a7e3212d | 966 | |
6ae22ffb LP |
967 | (void) fd_cloexec(STDIN_FILENO, false); |
968 | (void) fd_cloexec(STDOUT_FILENO, false); | |
969 | (void) fd_nonblock(STDIN_FILENO, false); | |
970 | (void) fd_nonblock(STDOUT_FILENO, false); | |
a7e3212d LP |
971 | |
972 | if (b->exec_argv) | |
973 | execvp(b->exec_path, b->exec_argv); | |
974 | else { | |
975 | const char *argv[] = { b->exec_path, NULL }; | |
976 | execvp(b->exec_path, (char**) argv); | |
977 | } | |
978 | ||
979 | _exit(EXIT_FAILURE); | |
980 | } | |
981 | ||
03e334a1 | 982 | safe_close(s[1]); |
e82c9509 | 983 | b->output_fd = b->input_fd = s[0]; |
a7e3212d | 984 | |
8f04d2eb | 985 | bus_socket_setup(b); |
e1d337d4 | 986 | |
a7e3212d LP |
987 | return bus_socket_start_auth(b); |
988 | } | |
989 | ||
990 | int bus_socket_take_fd(sd_bus *b) { | |
a7e3212d LP |
991 | assert(b); |
992 | ||
8f04d2eb | 993 | bus_socket_setup(b); |
a7e3212d LP |
994 | |
995 | return bus_socket_start_auth(b); | |
996 | } | |
997 | ||
998 | int bus_socket_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) { | |
a7e3212d LP |
999 | struct iovec *iov; |
1000 | ssize_t k; | |
1001 | size_t n; | |
1002 | unsigned j; | |
bc7fd8cd | 1003 | int r; |
a7e3212d LP |
1004 | |
1005 | assert(bus); | |
1006 | assert(m); | |
1007 | assert(idx); | |
945c2931 | 1008 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 1009 | |
6629161f | 1010 | if (*idx >= BUS_MESSAGE_SIZE(m)) |
a7e3212d | 1011 | return 0; |
a7e3212d | 1012 | |
bc7fd8cd LP |
1013 | r = bus_message_setup_iovec(m); |
1014 | if (r < 0) | |
1015 | return r; | |
2100fa10 | 1016 | |
a7e3212d LP |
1017 | n = m->n_iovec * sizeof(struct iovec); |
1018 | iov = alloca(n); | |
75f32f04 | 1019 | memcpy_safe(iov, m->iovec, n); |
a7e3212d LP |
1020 | |
1021 | j = 0; | |
1022 | iovec_advance(iov, &j, *idx); | |
1023 | ||
15d5af81 LP |
1024 | if (bus->prefer_writev) |
1025 | k = writev(bus->output_fd, iov, m->n_iovec); | |
1026 | else { | |
7f4e6a1c ZJS |
1027 | struct msghdr mh = { |
1028 | .msg_iov = iov, | |
1029 | .msg_iovlen = m->n_iovec, | |
1030 | }; | |
15d5af81 | 1031 | |
f29eef2e | 1032 | if (m->n_fds > 0 && *idx == 0) { |
15d5af81 | 1033 | struct cmsghdr *control; |
15d5af81 | 1034 | |
7f4e6a1c ZJS |
1035 | mh.msg_control = control = alloca(CMSG_SPACE(sizeof(int) * m->n_fds)); |
1036 | mh.msg_controllen = control->cmsg_len = CMSG_LEN(sizeof(int) * m->n_fds); | |
15d5af81 LP |
1037 | control->cmsg_level = SOL_SOCKET; |
1038 | control->cmsg_type = SCM_RIGHTS; | |
15d5af81 LP |
1039 | memcpy(CMSG_DATA(control), m->fds, sizeof(int) * m->n_fds); |
1040 | } | |
1041 | ||
15d5af81 LP |
1042 | k = sendmsg(bus->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); |
1043 | if (k < 0 && errno == ENOTSOCK) { | |
1044 | bus->prefer_writev = true; | |
1045 | k = writev(bus->output_fd, iov, m->n_iovec); | |
1046 | } | |
1047 | } | |
a7e3212d | 1048 | |
a7e3212d LP |
1049 | if (k < 0) |
1050 | return errno == EAGAIN ? 0 : -errno; | |
1051 | ||
1052 | *idx += (size_t) k; | |
1053 | return 1; | |
1054 | } | |
1055 | ||
1056 | static int bus_socket_read_message_need(sd_bus *bus, size_t *need) { | |
1057 | uint32_t a, b; | |
1058 | uint8_t e; | |
1059 | uint64_t sum; | |
1060 | ||
1061 | assert(bus); | |
1062 | assert(need); | |
945c2931 | 1063 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1064 | |
1065 | if (bus->rbuffer_size < sizeof(struct bus_header)) { | |
1066 | *need = sizeof(struct bus_header) + 8; | |
1067 | ||
1068 | /* Minimum message size: | |
1069 | * | |
1070 | * Header + | |
1071 | * | |
1072 | * Method Call: +2 string headers | |
1073 | * Signal: +3 string headers | |
1074 | * Method Error: +1 string headers | |
1075 | * +1 uint32 headers | |
1076 | * Method Reply: +1 uint32 headers | |
1077 | * | |
1078 | * A string header is at least 9 bytes | |
1079 | * A uint32 header is at least 8 bytes | |
1080 | * | |
1081 | * Hence the minimum message size of a valid message | |
1082 | * is header + 8 bytes */ | |
1083 | ||
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | a = ((const uint32_t*) bus->rbuffer)[1]; | |
1088 | b = ((const uint32_t*) bus->rbuffer)[3]; | |
1089 | ||
1090 | e = ((const uint8_t*) bus->rbuffer)[0]; | |
0461f8cd | 1091 | if (e == BUS_LITTLE_ENDIAN) { |
a7e3212d LP |
1092 | a = le32toh(a); |
1093 | b = le32toh(b); | |
0461f8cd | 1094 | } else if (e == BUS_BIG_ENDIAN) { |
a7e3212d LP |
1095 | a = be32toh(a); |
1096 | b = be32toh(b); | |
1097 | } else | |
1098 | return -EBADMSG; | |
1099 | ||
1100 | sum = (uint64_t) sizeof(struct bus_header) + (uint64_t) ALIGN_TO(b, 8) + (uint64_t) a; | |
1101 | if (sum >= BUS_MESSAGE_SIZE_MAX) | |
1102 | return -ENOBUFS; | |
1103 | ||
1104 | *need = (size_t) sum; | |
1105 | return 0; | |
1106 | } | |
1107 | ||
7d22c717 | 1108 | static int bus_socket_make_message(sd_bus *bus, size_t size) { |
a7e3212d LP |
1109 | sd_bus_message *t; |
1110 | void *b; | |
1111 | int r; | |
1112 | ||
1113 | assert(bus); | |
a7e3212d | 1114 | assert(bus->rbuffer_size >= size); |
945c2931 | 1115 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 1116 | |
7adc46fc LP |
1117 | r = bus_rqueue_make_room(bus); |
1118 | if (r < 0) | |
1119 | return r; | |
1120 | ||
a7e3212d LP |
1121 | if (bus->rbuffer_size > size) { |
1122 | b = memdup((const uint8_t*) bus->rbuffer + size, | |
1123 | bus->rbuffer_size - size); | |
1124 | if (!b) | |
1125 | return -ENOMEM; | |
1126 | } else | |
1127 | b = NULL; | |
1128 | ||
df2d202e LP |
1129 | r = bus_message_from_malloc(bus, |
1130 | bus->rbuffer, size, | |
a7e3212d | 1131 | bus->fds, bus->n_fds, |
038f9863 | 1132 | NULL, |
a7e3212d LP |
1133 | &t); |
1134 | if (r < 0) { | |
1135 | free(b); | |
1136 | return r; | |
1137 | } | |
1138 | ||
1139 | bus->rbuffer = b; | |
1140 | bus->rbuffer_size -= size; | |
1141 | ||
1142 | bus->fds = NULL; | |
1143 | bus->n_fds = 0; | |
1144 | ||
7adc46fc | 1145 | bus->rqueue[bus->rqueue_size++] = t; |
7d22c717 | 1146 | |
a7e3212d LP |
1147 | return 1; |
1148 | } | |
1149 | ||
7d22c717 | 1150 | int bus_socket_read_message(sd_bus *bus) { |
a7e3212d | 1151 | struct msghdr mh; |
7f4e6a1c | 1152 | struct iovec iov = {}; |
a7e3212d LP |
1153 | ssize_t k; |
1154 | size_t need; | |
1155 | int r; | |
1156 | void *b; | |
1157 | union { | |
1158 | struct cmsghdr cmsghdr; | |
d868f2a3 | 1159 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
a7e3212d | 1160 | } control; |
4d3a5b10 | 1161 | bool handle_cmsg = false; |
a7e3212d LP |
1162 | |
1163 | assert(bus); | |
945c2931 | 1164 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1165 | |
1166 | r = bus_socket_read_message_need(bus, &need); | |
1167 | if (r < 0) | |
1168 | return r; | |
1169 | ||
1170 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1171 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1172 | |
1173 | b = realloc(bus->rbuffer, need); | |
1174 | if (!b) | |
1175 | return -ENOMEM; | |
1176 | ||
1177 | bus->rbuffer = b; | |
1178 | ||
a7e3212d LP |
1179 | iov.iov_base = (uint8_t*) bus->rbuffer + bus->rbuffer_size; |
1180 | iov.iov_len = need - bus->rbuffer_size; | |
1181 | ||
15d5af81 LP |
1182 | if (bus->prefer_readv) |
1183 | k = readv(bus->input_fd, &iov, 1); | |
1184 | else { | |
1185 | zero(mh); | |
1186 | mh.msg_iov = &iov; | |
1187 | mh.msg_iovlen = 1; | |
1188 | mh.msg_control = &control; | |
1189 | mh.msg_controllen = sizeof(control); | |
1190 | ||
1191 | k = recvmsg(bus->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); | |
1192 | if (k < 0 && errno == ENOTSOCK) { | |
1193 | bus->prefer_readv = true; | |
1194 | k = readv(bus->input_fd, &iov, 1); | |
1195 | } else | |
1196 | handle_cmsg = true; | |
1197 | } | |
a7e3212d LP |
1198 | if (k < 0) |
1199 | return errno == EAGAIN ? 0 : -errno; | |
1200 | if (k == 0) | |
1201 | return -ECONNRESET; | |
1202 | ||
1203 | bus->rbuffer_size += k; | |
1204 | ||
2a1288ff LP |
1205 | if (handle_cmsg) { |
1206 | struct cmsghdr *cmsg; | |
1207 | ||
1208 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
1209 | if (cmsg->cmsg_level == SOL_SOCKET && |
1210 | cmsg->cmsg_type == SCM_RIGHTS) { | |
1211 | int n, *f; | |
1212 | ||
1213 | n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
1214 | ||
1215 | if (!bus->can_fds) { | |
1216 | /* Whut? We received fds but this | |
1217 | * isn't actually enabled? Close them, | |
1218 | * and fail */ | |
1219 | ||
1220 | close_many((int*) CMSG_DATA(cmsg), n); | |
1221 | return -EIO; | |
1222 | } | |
1223 | ||
a0f5ab70 | 1224 | f = realloc(bus->fds, sizeof(int) * (bus->n_fds + n)); |
15d5af81 LP |
1225 | if (!f) { |
1226 | close_many((int*) CMSG_DATA(cmsg), n); | |
1227 | return -ENOMEM; | |
1228 | } | |
1229 | ||
75f32f04 | 1230 | memcpy_safe(f + bus->n_fds, CMSG_DATA(cmsg), n * sizeof(int)); |
15d5af81 LP |
1231 | bus->fds = f; |
1232 | bus->n_fds += n; | |
d868f2a3 ZJS |
1233 | } else |
1234 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
1235 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 1236 | } |
a7e3212d LP |
1237 | |
1238 | r = bus_socket_read_message_need(bus, &need); | |
1239 | if (r < 0) | |
1240 | return r; | |
1241 | ||
1242 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1243 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1244 | |
1245 | return 1; | |
1246 | } | |
1247 | ||
1248 | int bus_socket_process_opening(sd_bus *b) { | |
1249 | int error = 0; | |
1250 | socklen_t slen = sizeof(error); | |
b92bea5d ZJS |
1251 | struct pollfd p = { |
1252 | .fd = b->output_fd, | |
1253 | .events = POLLOUT, | |
1254 | }; | |
a7e3212d LP |
1255 | int r; |
1256 | ||
a7e3212d LP |
1257 | assert(b->state == BUS_OPENING); |
1258 | ||
a7e3212d LP |
1259 | r = poll(&p, 1, 0); |
1260 | if (r < 0) | |
1261 | return -errno; | |
1262 | ||
1263 | if (!(p.revents & (POLLOUT|POLLERR|POLLHUP))) | |
1264 | return 0; | |
1265 | ||
e82c9509 | 1266 | r = getsockopt(b->output_fd, SOL_SOCKET, SO_ERROR, &error, &slen); |
a7e3212d LP |
1267 | if (r < 0) |
1268 | b->last_connect_error = errno; | |
1269 | else if (error != 0) | |
1270 | b->last_connect_error = error; | |
1271 | else if (p.revents & (POLLERR|POLLHUP)) | |
1272 | b->last_connect_error = ECONNREFUSED; | |
1273 | else | |
1274 | return bus_socket_start_auth(b); | |
1275 | ||
1276 | return bus_next_address(b); | |
1277 | } | |
1278 | ||
1279 | int bus_socket_process_authenticating(sd_bus *b) { | |
1280 | int r; | |
1281 | ||
1282 | assert(b); | |
1283 | assert(b->state == BUS_AUTHENTICATING); | |
1284 | ||
1285 | if (now(CLOCK_MONOTONIC) >= b->auth_timeout) | |
1286 | return -ETIMEDOUT; | |
1287 | ||
1288 | r = bus_socket_write_auth(b); | |
1289 | if (r != 0) | |
1290 | return r; | |
1291 | ||
1292 | return bus_socket_read_auth(b); | |
1293 | } | |
8a5cd31e LP |
1294 | |
1295 | int bus_socket_process_watch_bind(sd_bus *b) { | |
1296 | int r, q; | |
1297 | ||
1298 | assert(b); | |
1299 | assert(b->state == BUS_WATCH_BIND); | |
1300 | assert(b->inotify_fd >= 0); | |
1301 | ||
1302 | r = flush_fd(b->inotify_fd); | |
1303 | if (r <= 0) | |
1304 | return r; | |
1305 | ||
1306 | log_debug("Got inotify event on bus %s.", strna(b->description)); | |
1307 | ||
1308 | /* We flushed events out of the inotify fd. In that case, maybe the socket is valid now? Let's try to connect | |
1309 | * to it again */ | |
1310 | ||
1311 | r = bus_socket_connect(b); | |
1312 | if (r < 0) | |
1313 | return r; | |
1314 | ||
1315 | q = bus_attach_io_events(b); | |
1316 | if (q < 0) | |
1317 | return q; | |
1318 | ||
1319 | q = bus_attach_inotify_event(b); | |
1320 | if (q < 0) | |
1321 | return q; | |
1322 | ||
1323 | return r; | |
1324 | } |