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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 | |
a7e3212d LP |
6 | ***/ |
7 | ||
8 | #include <endian.h> | |
07630cea | 9 | #include <poll.h> |
a7e3212d LP |
10 | #include <stdlib.h> |
11 | #include <unistd.h> | |
a7e3212d | 12 | |
07630cea | 13 | #include "sd-bus.h" |
24882e06 | 14 | #include "sd-daemon.h" |
07630cea | 15 | |
b5efdb8a | 16 | #include "alloc-util.h" |
07630cea LP |
17 | #include "bus-internal.h" |
18 | #include "bus-message.h" | |
3ffd4af2 LP |
19 | #include "bus-socket.h" |
20 | #include "fd-util.h" | |
f97b34a6 | 21 | #include "format-util.h" |
8a5cd31e | 22 | #include "fs-util.h" |
15a5e950 | 23 | #include "hexdecoct.h" |
8a5cd31e | 24 | #include "io-util.h" |
a7e3212d LP |
25 | #include "macro.h" |
26 | #include "missing.h" | |
8a5cd31e | 27 | #include "path-util.h" |
dccca82b | 28 | #include "process-util.h" |
7fc04b12 | 29 | #include "selinux-util.h" |
24882e06 | 30 | #include "signal-util.h" |
15a5e950 | 31 | #include "stdio-util.h" |
07630cea | 32 | #include "string-util.h" |
b1d4f8e1 | 33 | #include "user-util.h" |
07630cea LP |
34 | #include "utf8.h" |
35 | #include "util.h" | |
a7e3212d | 36 | |
aec6d91f LP |
37 | #define SNDBUF_SIZE (8*1024*1024) |
38 | ||
2181a7f5 | 39 | static void iovec_advance(struct iovec iov[], unsigned *idx, size_t size) { |
a7e3212d LP |
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 | ||
313cefa1 | 55 | (*idx)++; |
a7e3212d LP |
56 | } |
57 | } | |
58 | ||
bc7fd8cd | 59 | static int append_iovec(sd_bus_message *m, const void *p, size_t sz) { |
2100fa10 LP |
60 | assert(m); |
61 | assert(p); | |
62 | assert(sz > 0); | |
63 | ||
64 | m->iovec[m->n_iovec].iov_base = (void*) p; | |
65 | m->iovec[m->n_iovec].iov_len = sz; | |
66 | m->n_iovec++; | |
bc7fd8cd LP |
67 | |
68 | return 0; | |
2100fa10 LP |
69 | } |
70 | ||
bc7fd8cd LP |
71 | static int bus_message_setup_iovec(sd_bus_message *m) { |
72 | struct bus_body_part *part; | |
13c299d3 | 73 | unsigned n, i; |
bc7fd8cd LP |
74 | int r; |
75 | ||
2100fa10 LP |
76 | assert(m); |
77 | assert(m->sealed); | |
78 | ||
79 | if (m->n_iovec > 0) | |
bc7fd8cd LP |
80 | return 0; |
81 | ||
82 | assert(!m->iovec); | |
2100fa10 | 83 | |
c91cb83c | 84 | n = 1 + m->n_body_parts; |
bc7fd8cd LP |
85 | if (n < ELEMENTSOF(m->iovec_fixed)) |
86 | m->iovec = m->iovec_fixed; | |
87 | else { | |
88 | m->iovec = new(struct iovec, n); | |
66b26c5c LP |
89 | if (!m->iovec) { |
90 | r = -ENOMEM; | |
91 | goto fail; | |
92 | } | |
bc7fd8cd | 93 | } |
2100fa10 | 94 | |
c91cb83c | 95 | r = append_iovec(m, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
bc7fd8cd | 96 | if (r < 0) |
66b26c5c | 97 | goto fail; |
2100fa10 | 98 | |
9b29bb68 | 99 | MESSAGE_FOREACH_PART(part, i, m) { |
66b26c5c LP |
100 | r = bus_body_part_map(part); |
101 | if (r < 0) | |
102 | goto fail; | |
103 | ||
bc7fd8cd LP |
104 | r = append_iovec(m, part->data, part->size); |
105 | if (r < 0) | |
66b26c5c | 106 | goto fail; |
bc7fd8cd LP |
107 | } |
108 | ||
109 | assert(n == m->n_iovec); | |
110 | ||
111 | return 0; | |
66b26c5c LP |
112 | |
113 | fail: | |
114 | m->poisoned = true; | |
115 | return r; | |
2100fa10 LP |
116 | } |
117 | ||
2181a7f5 LP |
118 | bool bus_socket_auth_needs_write(sd_bus *b) { |
119 | ||
120 | unsigned i; | |
121 | ||
122 | if (b->auth_index >= ELEMENTSOF(b->auth_iovec)) | |
123 | return false; | |
124 | ||
125 | for (i = b->auth_index; i < ELEMENTSOF(b->auth_iovec); i++) { | |
126 | struct iovec *j = b->auth_iovec + i; | |
127 | ||
128 | if (j->iov_len > 0) | |
129 | return true; | |
130 | } | |
131 | ||
132 | return false; | |
133 | } | |
134 | ||
a7e3212d | 135 | static int bus_socket_write_auth(sd_bus *b) { |
a7e3212d LP |
136 | ssize_t k; |
137 | ||
138 | assert(b); | |
139 | assert(b->state == BUS_AUTHENTICATING); | |
140 | ||
2181a7f5 | 141 | if (!bus_socket_auth_needs_write(b)) |
a7e3212d LP |
142 | return 0; |
143 | ||
15d5af81 LP |
144 | if (b->prefer_writev) |
145 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
146 | else { | |
147 | struct msghdr mh; | |
148 | zero(mh); | |
149 | ||
150 | mh.msg_iov = b->auth_iovec + b->auth_index; | |
151 | mh.msg_iovlen = ELEMENTSOF(b->auth_iovec) - b->auth_index; | |
152 | ||
153 | k = sendmsg(b->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
154 | if (k < 0 && errno == ENOTSOCK) { | |
155 | b->prefer_writev = true; | |
156 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
157 | } | |
158 | } | |
a7e3212d | 159 | |
a7e3212d LP |
160 | if (k < 0) |
161 | return errno == EAGAIN ? 0 : -errno; | |
162 | ||
163 | iovec_advance(b->auth_iovec, &b->auth_index, (size_t) k); | |
a7e3212d LP |
164 | return 1; |
165 | } | |
166 | ||
2181a7f5 | 167 | static int bus_socket_auth_verify_client(sd_bus *b) { |
a7e3212d LP |
168 | char *e, *f, *start; |
169 | sd_id128_t peer; | |
170 | unsigned i; | |
171 | int r; | |
172 | ||
2181a7f5 LP |
173 | assert(b); |
174 | ||
a7e3212d LP |
175 | /* We expect two response lines: "OK" and possibly |
176 | * "AGREE_UNIX_FD" */ | |
177 | ||
6e6c21c8 | 178 | e = memmem_safe(b->rbuffer, b->rbuffer_size, "\r\n", 2); |
a7e3212d LP |
179 | if (!e) |
180 | return 0; | |
181 | ||
c7db1984 | 182 | if (b->accept_fd) { |
a7e3212d LP |
183 | f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2); |
184 | if (!f) | |
185 | return 0; | |
186 | ||
187 | start = f + 2; | |
188 | } else { | |
189 | f = NULL; | |
190 | start = e + 2; | |
191 | } | |
192 | ||
193 | /* Nice! We got all the lines we need. First check the OK | |
194 | * line */ | |
195 | ||
196 | if (e - (char*) b->rbuffer != 3 + 32) | |
197 | return -EPERM; | |
198 | ||
199 | if (memcmp(b->rbuffer, "OK ", 3)) | |
200 | return -EPERM; | |
201 | ||
2181a7f5 LP |
202 | b->auth = b->anonymous_auth ? BUS_AUTH_ANONYMOUS : BUS_AUTH_EXTERNAL; |
203 | ||
a7e3212d LP |
204 | for (i = 0; i < 32; i += 2) { |
205 | int x, y; | |
206 | ||
207 | x = unhexchar(((char*) b->rbuffer)[3 + i]); | |
208 | y = unhexchar(((char*) b->rbuffer)[3 + i + 1]); | |
209 | ||
210 | if (x < 0 || y < 0) | |
211 | return -EINVAL; | |
212 | ||
213 | peer.bytes[i/2] = ((uint8_t) x << 4 | (uint8_t) y); | |
214 | } | |
215 | ||
3bbaff3e | 216 | if (!sd_id128_is_null(b->server_id) && |
98178d39 | 217 | !sd_id128_equal(b->server_id, peer)) |
a7e3212d LP |
218 | return -EPERM; |
219 | ||
98178d39 | 220 | b->server_id = peer; |
a7e3212d LP |
221 | |
222 | /* And possibly check the second line, too */ | |
223 | ||
224 | if (f) | |
225 | b->can_fds = | |
fbd0b64f LP |
226 | (f - e == STRLEN("\r\nAGREE_UNIX_FD")) && |
227 | memcmp(e + 2, "AGREE_UNIX_FD", | |
228 | STRLEN("AGREE_UNIX_FD")) == 0; | |
a7e3212d LP |
229 | |
230 | b->rbuffer_size -= (start - (char*) b->rbuffer); | |
231 | memmove(b->rbuffer, start, b->rbuffer_size); | |
232 | ||
233 | r = bus_start_running(b); | |
234 | if (r < 0) | |
235 | return r; | |
236 | ||
237 | return 1; | |
238 | } | |
239 | ||
2181a7f5 LP |
240 | static bool line_equals(const char *s, size_t m, const char *line) { |
241 | size_t l; | |
242 | ||
243 | l = strlen(line); | |
244 | if (l != m) | |
245 | return false; | |
246 | ||
247 | return memcmp(s, line, l) == 0; | |
248 | } | |
249 | ||
250 | static bool line_begins(const char *s, size_t m, const char *word) { | |
251 | size_t l; | |
252 | ||
253 | l = strlen(word); | |
254 | if (m < l) | |
255 | return false; | |
256 | ||
257 | if (memcmp(s, word, l) != 0) | |
258 | return false; | |
259 | ||
260 | return m == l || (m > l && s[l] == ' '); | |
261 | } | |
262 | ||
263 | static int verify_anonymous_token(sd_bus *b, const char *p, size_t l) { | |
264 | _cleanup_free_ char *token = NULL; | |
30494563 TG |
265 | size_t len; |
266 | int r; | |
2181a7f5 LP |
267 | |
268 | if (!b->anonymous_auth) | |
269 | return 0; | |
270 | ||
271 | if (l <= 0) | |
272 | return 1; | |
273 | ||
274 | assert(p[0] == ' '); | |
275 | p++; l--; | |
276 | ||
277 | if (l % 2 != 0) | |
278 | return 0; | |
2181a7f5 | 279 | |
30494563 TG |
280 | r = unhexmem(p, l, (void **) &token, &len); |
281 | if (r < 0) | |
282 | return 0; | |
283 | ||
284 | if (memchr(token, 0, len)) | |
2181a7f5 LP |
285 | return 0; |
286 | ||
287 | return !!utf8_is_valid(token); | |
288 | } | |
289 | ||
290 | static int verify_external_token(sd_bus *b, const char *p, size_t l) { | |
291 | _cleanup_free_ char *token = NULL; | |
30494563 | 292 | size_t len; |
2181a7f5 LP |
293 | uid_t u; |
294 | int r; | |
295 | ||
296 | /* We don't do any real authentication here. Instead, we if | |
297 | * the owner of this bus wanted authentication he should have | |
298 | * checked SO_PEERCRED before even creating the bus object. */ | |
299 | ||
8411d2a2 | 300 | if (!b->anonymous_auth && !b->ucred_valid) |
2181a7f5 LP |
301 | return 0; |
302 | ||
303 | if (l <= 0) | |
304 | return 1; | |
305 | ||
306 | assert(p[0] == ' '); | |
307 | p++; l--; | |
308 | ||
309 | if (l % 2 != 0) | |
310 | return 0; | |
311 | ||
30494563 TG |
312 | r = unhexmem(p, l, (void**) &token, &len); |
313 | if (r < 0) | |
314 | return 0; | |
2181a7f5 | 315 | |
30494563 | 316 | if (memchr(token, 0, len)) |
2181a7f5 LP |
317 | return 0; |
318 | ||
319 | r = parse_uid(token, &u); | |
320 | if (r < 0) | |
321 | return 0; | |
322 | ||
8411d2a2 LP |
323 | /* We ignore the passed value if anonymous authentication is |
324 | * on anyway. */ | |
325 | if (!b->anonymous_auth && u != b->ucred.uid) | |
2181a7f5 LP |
326 | return 0; |
327 | ||
328 | return 1; | |
329 | } | |
330 | ||
331 | static int bus_socket_auth_write(sd_bus *b, const char *t) { | |
332 | char *p; | |
333 | size_t l; | |
334 | ||
335 | assert(b); | |
336 | assert(t); | |
337 | ||
338 | /* We only make use of the first iovec */ | |
945c2931 | 339 | assert(IN_SET(b->auth_index, 0, 1)); |
2181a7f5 LP |
340 | |
341 | l = strlen(t); | |
342 | p = malloc(b->auth_iovec[0].iov_len + l); | |
343 | if (!p) | |
344 | return -ENOMEM; | |
345 | ||
75f32f04 | 346 | memcpy_safe(p, b->auth_iovec[0].iov_base, b->auth_iovec[0].iov_len); |
2181a7f5 LP |
347 | memcpy(p + b->auth_iovec[0].iov_len, t, l); |
348 | ||
349 | b->auth_iovec[0].iov_base = p; | |
350 | b->auth_iovec[0].iov_len += l; | |
351 | ||
352 | free(b->auth_buffer); | |
353 | b->auth_buffer = p; | |
354 | b->auth_index = 0; | |
355 | return 0; | |
356 | } | |
357 | ||
358 | static int bus_socket_auth_write_ok(sd_bus *b) { | |
359 | char t[3 + 32 + 2 + 1]; | |
360 | ||
361 | assert(b); | |
362 | ||
5ffa8c81 | 363 | xsprintf(t, "OK " SD_ID128_FORMAT_STR "\r\n", SD_ID128_FORMAT_VAL(b->server_id)); |
2181a7f5 LP |
364 | |
365 | return bus_socket_auth_write(b, t); | |
366 | } | |
367 | ||
368 | static int bus_socket_auth_verify_server(sd_bus *b) { | |
369 | char *e; | |
370 | const char *line; | |
371 | size_t l; | |
372 | bool processed = false; | |
373 | int r; | |
374 | ||
375 | assert(b); | |
376 | ||
2b4ac889 | 377 | if (b->rbuffer_size < 1) |
2181a7f5 LP |
378 | return 0; |
379 | ||
380 | /* First char must be a NUL byte */ | |
381 | if (*(char*) b->rbuffer != 0) | |
382 | return -EIO; | |
383 | ||
2b4ac889 LP |
384 | if (b->rbuffer_size < 3) |
385 | return 0; | |
386 | ||
2181a7f5 LP |
387 | /* Begin with the first line */ |
388 | if (b->auth_rbegin <= 0) | |
389 | b->auth_rbegin = 1; | |
390 | ||
391 | for (;;) { | |
392 | /* Check if line is complete */ | |
393 | line = (char*) b->rbuffer + b->auth_rbegin; | |
394 | e = memmem(line, b->rbuffer_size - b->auth_rbegin, "\r\n", 2); | |
395 | if (!e) | |
396 | return processed; | |
397 | ||
398 | l = e - line; | |
399 | ||
400 | if (line_begins(line, l, "AUTH ANONYMOUS")) { | |
401 | ||
402 | r = verify_anonymous_token(b, line + 14, l - 14); | |
403 | if (r < 0) | |
404 | return r; | |
405 | if (r == 0) | |
406 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
407 | else { | |
408 | b->auth = BUS_AUTH_ANONYMOUS; | |
409 | r = bus_socket_auth_write_ok(b); | |
410 | } | |
411 | ||
412 | } else if (line_begins(line, l, "AUTH EXTERNAL")) { | |
413 | ||
414 | r = verify_external_token(b, line + 13, l - 13); | |
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_EXTERNAL; | |
421 | r = bus_socket_auth_write_ok(b); | |
422 | } | |
423 | ||
424 | } else if (line_begins(line, l, "AUTH")) | |
425 | r = bus_socket_auth_write(b, "REJECTED EXTERNAL ANONYMOUS\r\n"); | |
426 | else if (line_equals(line, l, "CANCEL") || | |
427 | line_begins(line, l, "ERROR")) { | |
428 | ||
429 | b->auth = _BUS_AUTH_INVALID; | |
430 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
431 | ||
432 | } else if (line_equals(line, l, "BEGIN")) { | |
433 | ||
434 | if (b->auth == _BUS_AUTH_INVALID) | |
435 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
436 | else { | |
437 | /* We can't leave from the auth phase | |
438 | * before we haven't written | |
439 | * everything queued, so let's check | |
440 | * that */ | |
441 | ||
442 | if (bus_socket_auth_needs_write(b)) | |
443 | return 1; | |
444 | ||
445 | b->rbuffer_size -= (e + 2 - (char*) b->rbuffer); | |
446 | memmove(b->rbuffer, e + 2, b->rbuffer_size); | |
447 | return bus_start_running(b); | |
448 | } | |
449 | ||
450 | } else if (line_begins(line, l, "DATA")) { | |
451 | ||
452 | if (b->auth == _BUS_AUTH_INVALID) | |
453 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
454 | else { | |
455 | if (b->auth == BUS_AUTH_ANONYMOUS) | |
456 | r = verify_anonymous_token(b, line + 4, l - 4); | |
457 | else | |
458 | r = verify_external_token(b, line + 4, l - 4); | |
459 | ||
460 | if (r < 0) | |
461 | return r; | |
462 | if (r == 0) { | |
463 | b->auth = _BUS_AUTH_INVALID; | |
464 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
465 | } else | |
466 | r = bus_socket_auth_write_ok(b); | |
467 | } | |
468 | } else if (line_equals(line, l, "NEGOTIATE_UNIX_FD")) { | |
c7db1984 | 469 | if (b->auth == _BUS_AUTH_INVALID || !b->accept_fd) |
2181a7f5 LP |
470 | r = bus_socket_auth_write(b, "ERROR\r\n"); |
471 | else { | |
472 | b->can_fds = true; | |
473 | r = bus_socket_auth_write(b, "AGREE_UNIX_FD\r\n"); | |
474 | } | |
475 | } else | |
476 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
477 | ||
478 | if (r < 0) | |
479 | return r; | |
480 | ||
481 | b->auth_rbegin = e + 2 - (char*) b->rbuffer; | |
482 | ||
483 | processed = true; | |
484 | } | |
485 | } | |
486 | ||
487 | static int bus_socket_auth_verify(sd_bus *b) { | |
488 | assert(b); | |
489 | ||
490 | if (b->is_server) | |
491 | return bus_socket_auth_verify_server(b); | |
492 | else | |
493 | return bus_socket_auth_verify_client(b); | |
494 | } | |
495 | ||
a7e3212d LP |
496 | static int bus_socket_read_auth(sd_bus *b) { |
497 | struct msghdr mh; | |
7f4e6a1c | 498 | struct iovec iov = {}; |
a7e3212d LP |
499 | size_t n; |
500 | ssize_t k; | |
501 | int r; | |
502 | void *p; | |
2181a7f5 LP |
503 | union { |
504 | struct cmsghdr cmsghdr; | |
d868f2a3 | 505 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
2181a7f5 | 506 | } control; |
15d5af81 | 507 | bool handle_cmsg = false; |
a7e3212d LP |
508 | |
509 | assert(b); | |
2181a7f5 | 510 | assert(b->state == BUS_AUTHENTICATING); |
a7e3212d LP |
511 | |
512 | r = bus_socket_auth_verify(b); | |
513 | if (r != 0) | |
514 | return r; | |
515 | ||
9607d947 | 516 | n = MAX(256u, b->rbuffer_size * 2); |
a7e3212d LP |
517 | |
518 | if (n > BUS_AUTH_SIZE_MAX) | |
519 | n = BUS_AUTH_SIZE_MAX; | |
520 | ||
521 | if (b->rbuffer_size >= n) | |
522 | return -ENOBUFS; | |
523 | ||
524 | p = realloc(b->rbuffer, n); | |
525 | if (!p) | |
526 | return -ENOMEM; | |
527 | ||
528 | b->rbuffer = p; | |
529 | ||
a7e3212d LP |
530 | iov.iov_base = (uint8_t*) b->rbuffer + b->rbuffer_size; |
531 | iov.iov_len = n - b->rbuffer_size; | |
532 | ||
15d5af81 LP |
533 | if (b->prefer_readv) |
534 | k = readv(b->input_fd, &iov, 1); | |
535 | else { | |
536 | zero(mh); | |
537 | mh.msg_iov = &iov; | |
538 | mh.msg_iovlen = 1; | |
539 | mh.msg_control = &control; | |
540 | mh.msg_controllen = sizeof(control); | |
541 | ||
542 | k = recvmsg(b->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); | |
543 | if (k < 0 && errno == ENOTSOCK) { | |
544 | b->prefer_readv = true; | |
545 | k = readv(b->input_fd, &iov, 1); | |
546 | } else | |
547 | handle_cmsg = true; | |
548 | } | |
a7e3212d LP |
549 | if (k < 0) |
550 | return errno == EAGAIN ? 0 : -errno; | |
551 | if (k == 0) | |
552 | return -ECONNRESET; | |
553 | ||
554 | b->rbuffer_size += k; | |
555 | ||
2a1288ff LP |
556 | if (handle_cmsg) { |
557 | struct cmsghdr *cmsg; | |
558 | ||
559 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
560 | if (cmsg->cmsg_level == SOL_SOCKET && |
561 | cmsg->cmsg_type == SCM_RIGHTS) { | |
562 | int j; | |
563 | ||
564 | /* Whut? We received fds during the auth | |
565 | * protocol? Somebody is playing games with | |
566 | * us. Close them all, and fail */ | |
567 | j = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
568 | close_many((int*) CMSG_DATA(cmsg), j); | |
569 | return -EIO; | |
d868f2a3 ZJS |
570 | } else |
571 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
572 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 573 | } |
2181a7f5 | 574 | |
a7e3212d LP |
575 | r = bus_socket_auth_verify(b); |
576 | if (r != 0) | |
577 | return r; | |
578 | ||
579 | return 1; | |
580 | } | |
581 | ||
8f04d2eb | 582 | void bus_socket_setup(sd_bus *b) { |
a7e3212d LP |
583 | assert(b); |
584 | ||
aec6d91f | 585 | /* Increase the buffers to 8 MB */ |
6ae22ffb LP |
586 | (void) fd_inc_rcvbuf(b->input_fd, SNDBUF_SIZE); |
587 | (void) fd_inc_sndbuf(b->output_fd, SNDBUF_SIZE); | |
a7e3212d | 588 | |
e1d337d4 | 589 | b->message_version = 1; |
0f437184 | 590 | b->message_endian = 0; |
8f04d2eb | 591 | } |
e1d337d4 | 592 | |
8f04d2eb | 593 | static void bus_get_peercred(sd_bus *b) { |
c4e6556c ZJS |
594 | int r; |
595 | ||
8f04d2eb | 596 | assert(b); |
18ac4643 LP |
597 | assert(!b->ucred_valid); |
598 | assert(!b->label); | |
599 | assert(b->n_groups == (size_t) -1); | |
8f04d2eb LP |
600 | |
601 | /* Get the peer for socketpair() sockets */ | |
eff05270 | 602 | b->ucred_valid = getpeercred(b->input_fd, &b->ucred) >= 0; |
c4e6556c ZJS |
603 | |
604 | /* Get the SELinux context of the peer */ | |
db7d1dca | 605 | r = getpeersec(b->input_fd, &b->label); |
18ac4643 | 606 | if (r < 0 && !IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) |
db7d1dca | 607 | log_debug_errno(r, "Failed to determine peer security context: %m"); |
18ac4643 LP |
608 | |
609 | /* Get the list of auxiliary groups of the peer */ | |
610 | r = getpeergroups(b->input_fd, &b->groups); | |
c599b325 | 611 | if (r >= 0) |
18ac4643 | 612 | b->n_groups = (size_t) r; |
c599b325 ZJS |
613 | else if (!IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) |
614 | log_debug_errno(r, "Failed to determine peer's group list: %m"); | |
a7e3212d LP |
615 | } |
616 | ||
2181a7f5 | 617 | static int bus_socket_start_auth_client(sd_bus *b) { |
a7e3212d | 618 | size_t l; |
2181a7f5 | 619 | const char *auth_suffix, *auth_prefix; |
a7e3212d LP |
620 | |
621 | assert(b); | |
622 | ||
2181a7f5 LP |
623 | if (b->anonymous_auth) { |
624 | auth_prefix = "\0AUTH ANONYMOUS "; | |
a7e3212d | 625 | |
2181a7f5 LP |
626 | /* For ANONYMOUS auth we send some arbitrary "trace" string */ |
627 | l = 9; | |
628 | b->auth_buffer = hexmem("anonymous", l); | |
629 | } else { | |
5ffa8c81 | 630 | char text[DECIMAL_STR_MAX(uid_t) + 1]; |
a7e3212d | 631 | |
2181a7f5 | 632 | auth_prefix = "\0AUTH EXTERNAL "; |
a7e3212d | 633 | |
5ffa8c81 | 634 | xsprintf(text, UID_FMT, geteuid()); |
a7e3212d | 635 | |
2181a7f5 LP |
636 | l = strlen(text); |
637 | b->auth_buffer = hexmem(text, l); | |
638 | } | |
639 | ||
640 | if (!b->auth_buffer) | |
a7e3212d LP |
641 | return -ENOMEM; |
642 | ||
c7db1984 | 643 | if (b->accept_fd) |
2181a7f5 LP |
644 | auth_suffix = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n"; |
645 | else | |
646 | auth_suffix = "\r\nBEGIN\r\n"; | |
a7e3212d LP |
647 | |
648 | b->auth_iovec[0].iov_base = (void*) auth_prefix; | |
2181a7f5 LP |
649 | b->auth_iovec[0].iov_len = 1 + strlen(auth_prefix + 1); |
650 | b->auth_iovec[1].iov_base = (void*) b->auth_buffer; | |
a7e3212d LP |
651 | b->auth_iovec[1].iov_len = l * 2; |
652 | b->auth_iovec[2].iov_base = (void*) auth_suffix; | |
653 | b->auth_iovec[2].iov_len = strlen(auth_suffix); | |
a7e3212d LP |
654 | |
655 | return bus_socket_write_auth(b); | |
656 | } | |
657 | ||
a7893c6b | 658 | int bus_socket_start_auth(sd_bus *b) { |
2181a7f5 LP |
659 | assert(b); |
660 | ||
8f04d2eb LP |
661 | bus_get_peercred(b); |
662 | ||
3e0e196e | 663 | bus_set_state(b, BUS_AUTHENTICATING); |
036d61b3 | 664 | b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_AUTH_TIMEOUT; |
2181a7f5 | 665 | |
9ab32f9d | 666 | if (sd_is_socket(b->input_fd, AF_UNIX, 0, 0) <= 0) |
c7db1984 | 667 | b->accept_fd = false; |
2181a7f5 | 668 | |
9ab32f9d LP |
669 | if (b->output_fd != b->input_fd) |
670 | if (sd_is_socket(b->output_fd, AF_UNIX, 0, 0) <= 0) | |
c7db1984 | 671 | b->accept_fd = false; |
e82c9509 | 672 | |
2181a7f5 LP |
673 | if (b->is_server) |
674 | return bus_socket_read_auth(b); | |
675 | else | |
676 | return bus_socket_start_auth_client(b); | |
677 | } | |
678 | ||
8a5cd31e LP |
679 | static int bus_socket_inotify_setup(sd_bus *b) { |
680 | _cleanup_free_ int *new_watches = NULL; | |
681 | _cleanup_free_ char *absolute = NULL; | |
682 | size_t n_allocated = 0, n = 0, done = 0, i; | |
683 | unsigned max_follow = 32; | |
684 | const char *p; | |
685 | int wd, r; | |
686 | ||
687 | assert(b); | |
688 | assert(b->watch_bind); | |
689 | assert(b->sockaddr.sa.sa_family == AF_UNIX); | |
690 | assert(b->sockaddr.un.sun_path[0] != 0); | |
691 | ||
692 | /* Sets up an inotify fd in case watch_bind is enabled: wait until the configured AF_UNIX file system socket | |
693 | * appears before connecting to it. The implemented is pretty simplistic: we just subscribe to relevant changes | |
694 | * to all prefix components of the path, and every time we get an event for that we try to reconnect again, | |
695 | * without actually caring what precisely the event we got told us. If we still can't connect we re-subscribe | |
696 | * to all relevant changes of anything in the path, so that our watches include any possibly newly created path | |
697 | * components. */ | |
698 | ||
699 | if (b->inotify_fd < 0) { | |
700 | b->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
701 | if (b->inotify_fd < 0) | |
702 | return -errno; | |
7fe2903c LP |
703 | |
704 | b->inotify_fd = fd_move_above_stdio(b->inotify_fd); | |
8a5cd31e LP |
705 | } |
706 | ||
707 | /* Make sure the path is NUL terminated */ | |
708 | p = strndupa(b->sockaddr.un.sun_path, sizeof(b->sockaddr.un.sun_path)); | |
709 | ||
710 | /* Make sure the path is absolute */ | |
711 | r = path_make_absolute_cwd(p, &absolute); | |
712 | if (r < 0) | |
713 | goto fail; | |
714 | ||
715 | /* Watch all parent directories, and don't mind any prefix that doesn't exist yet. For the innermost directory | |
716 | * that exists we want to know when files are created or moved into it. For all parents of it we just care if | |
717 | * they are removed or renamed. */ | |
718 | ||
719 | if (!GREEDY_REALLOC(new_watches, n_allocated, n + 1)) { | |
720 | r = -ENOMEM; | |
721 | goto fail; | |
722 | } | |
723 | ||
724 | /* Start with the top-level directory, which is a bit simpler than the rest, since it can't be a symlink, and | |
725 | * always exists */ | |
726 | wd = inotify_add_watch(b->inotify_fd, "/", IN_CREATE|IN_MOVED_TO); | |
727 | if (wd < 0) { | |
728 | r = log_debug_errno(errno, "Failed to add inotify watch on /: %m"); | |
729 | goto fail; | |
730 | } else | |
731 | new_watches[n++] = wd; | |
732 | ||
733 | for (;;) { | |
734 | _cleanup_free_ char *component = NULL, *prefix = NULL, *destination = NULL; | |
735 | size_t n_slashes, n_component; | |
736 | char *c = NULL; | |
737 | ||
738 | n_slashes = strspn(absolute + done, "/"); | |
739 | n_component = n_slashes + strcspn(absolute + done + n_slashes, "/"); | |
740 | ||
741 | if (n_component == 0) /* The end */ | |
742 | break; | |
743 | ||
744 | component = strndup(absolute + done, n_component); | |
745 | if (!component) { | |
746 | r = -ENOMEM; | |
747 | goto fail; | |
748 | } | |
749 | ||
750 | /* A trailing slash? That's a directory, and not a socket then */ | |
751 | if (path_equal(component, "/")) { | |
752 | r = -EISDIR; | |
753 | goto fail; | |
754 | } | |
755 | ||
756 | /* A single dot? Let's eat this up */ | |
757 | if (path_equal(component, "/.")) { | |
758 | done += n_component; | |
759 | continue; | |
760 | } | |
761 | ||
762 | prefix = strndup(absolute, done + n_component); | |
763 | if (!prefix) { | |
764 | r = -ENOMEM; | |
765 | goto fail; | |
766 | } | |
767 | ||
768 | if (!GREEDY_REALLOC(new_watches, n_allocated, n + 1)) { | |
769 | r = -ENOMEM; | |
770 | goto fail; | |
771 | } | |
772 | ||
773 | wd = inotify_add_watch(b->inotify_fd, prefix, IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO|IN_DONT_FOLLOW); | |
774 | log_debug("Added inotify watch for %s on bus %s: %i", prefix, strna(b->description), wd); | |
775 | ||
776 | if (wd < 0) { | |
777 | if (IN_SET(errno, ENOENT, ELOOP)) | |
778 | break; /* This component doesn't exist yet, or the path contains a cyclic symlink right now */ | |
779 | ||
945403e6 | 780 | r = log_debug_errno(errno, "Failed to add inotify watch on %s: %m", empty_to_root(prefix)); |
8a5cd31e LP |
781 | goto fail; |
782 | } else | |
783 | new_watches[n++] = wd; | |
784 | ||
785 | /* Check if this is possibly a symlink. If so, let's follow it and watch it too. */ | |
786 | r = readlink_malloc(prefix, &destination); | |
787 | if (r == -EINVAL) { /* not a symlink */ | |
788 | done += n_component; | |
789 | continue; | |
790 | } | |
791 | if (r < 0) | |
792 | goto fail; | |
793 | ||
794 | if (isempty(destination)) { /* Empty symlink target? Yuck! */ | |
795 | r = -EINVAL; | |
796 | goto fail; | |
797 | } | |
798 | ||
799 | if (max_follow <= 0) { /* Let's make sure we don't follow symlinks forever */ | |
800 | r = -ELOOP; | |
801 | goto fail; | |
802 | } | |
803 | ||
804 | if (path_is_absolute(destination)) { | |
805 | /* For absolute symlinks we build the new path and start anew */ | |
806 | c = strjoin(destination, absolute + done + n_component); | |
807 | done = 0; | |
808 | } else { | |
809 | _cleanup_free_ char *t = NULL; | |
810 | ||
811 | /* For relative symlinks we replace the last component, and try again */ | |
812 | t = strndup(absolute, done); | |
813 | if (!t) | |
814 | return -ENOMEM; | |
815 | ||
816 | c = strjoin(t, "/", destination, absolute + done + n_component); | |
817 | } | |
818 | if (!c) { | |
819 | r = -ENOMEM; | |
820 | goto fail; | |
821 | } | |
822 | ||
823 | free(absolute); | |
824 | absolute = c; | |
825 | ||
826 | max_follow--; | |
827 | } | |
828 | ||
829 | /* And now, let's remove all watches from the previous iteration we don't need anymore */ | |
830 | for (i = 0; i < b->n_inotify_watches; i++) { | |
831 | bool found = false; | |
832 | size_t j; | |
833 | ||
834 | for (j = 0; j < n; j++) | |
835 | if (new_watches[j] == b->inotify_watches[i]) { | |
836 | found = true; | |
837 | break; | |
838 | } | |
839 | ||
840 | if (found) | |
841 | continue; | |
842 | ||
843 | (void) inotify_rm_watch(b->inotify_fd, b->inotify_watches[i]); | |
844 | } | |
845 | ||
846 | free_and_replace(b->inotify_watches, new_watches); | |
847 | b->n_inotify_watches = n; | |
848 | ||
849 | return 0; | |
850 | ||
851 | fail: | |
852 | bus_close_inotify_fd(b); | |
853 | return r; | |
854 | } | |
855 | ||
a7e3212d | 856 | int bus_socket_connect(sd_bus *b) { |
8a5cd31e | 857 | bool inotify_done = false; |
a7e3212d LP |
858 | int r; |
859 | ||
860 | assert(b); | |
a7e3212d | 861 | |
8a5cd31e LP |
862 | for (;;) { |
863 | assert(b->input_fd < 0); | |
864 | assert(b->output_fd < 0); | |
865 | assert(b->sockaddr.sa.sa_family != AF_UNSPEC); | |
a7e3212d | 866 | |
8a5cd31e LP |
867 | b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
868 | if (b->input_fd < 0) | |
869 | return -errno; | |
e82c9509 | 870 | |
7fe2903c LP |
871 | b->input_fd = fd_move_above_stdio(b->input_fd); |
872 | ||
8a5cd31e LP |
873 | b->output_fd = b->input_fd; |
874 | bus_socket_setup(b); | |
a7e3212d | 875 | |
8a5cd31e LP |
876 | if (connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size) < 0) { |
877 | if (errno == EINPROGRESS) { | |
a7e3212d | 878 | |
8a5cd31e LP |
879 | /* If we have any inotify watches open, close them now, we don't need them anymore, as |
880 | * we have successfully initiated a connection */ | |
881 | bus_close_inotify_fd(b); | |
882 | ||
883 | /* Note that very likely we are already in BUS_OPENING state here, as we enter it when | |
884 | * we start parsing the address string. The only reason we set the state explicitly | |
885 | * here, is to undo BUS_WATCH_BIND, in case we did the inotify magic. */ | |
3e0e196e | 886 | bus_set_state(b, BUS_OPENING); |
8a5cd31e LP |
887 | return 1; |
888 | } | |
889 | ||
890 | if (IN_SET(errno, ENOENT, ECONNREFUSED) && /* ENOENT → unix socket doesn't exist at all; ECONNREFUSED → unix socket stale */ | |
891 | b->watch_bind && | |
892 | b->sockaddr.sa.sa_family == AF_UNIX && | |
893 | b->sockaddr.un.sun_path[0] != 0) { | |
894 | ||
895 | /* This connection attempt failed, let's release the socket for now, and start with a | |
896 | * fresh one when reconnecting. */ | |
897 | bus_close_io_fds(b); | |
898 | ||
899 | if (inotify_done) { | |
900 | /* inotify set up already, don't do it again, just return now, and remember | |
901 | * that we are waiting for inotify events now. */ | |
3e0e196e | 902 | bus_set_state(b, BUS_WATCH_BIND); |
8a5cd31e LP |
903 | return 1; |
904 | } | |
905 | ||
906 | /* This is a file system socket, and the inotify logic is enabled. Let's create the necessary inotify fd. */ | |
907 | r = bus_socket_inotify_setup(b); | |
908 | if (r < 0) | |
909 | return r; | |
910 | ||
911 | /* Let's now try to connect a second time, because in theory there's otherwise a race | |
912 | * here: the socket might have been created in the time between our first connect() and | |
913 | * the time we set up the inotify logic. But let's remember that we set up inotify now, | |
914 | * so that we don't do the connect() more than twice. */ | |
915 | inotify_done = true; | |
916 | ||
917 | } else | |
918 | return -errno; | |
919 | } else | |
920 | break; | |
a7e3212d LP |
921 | } |
922 | ||
8a5cd31e LP |
923 | /* Yay, established, we don't need no inotify anymore! */ |
924 | bus_close_inotify_fd(b); | |
925 | ||
a7e3212d LP |
926 | return bus_socket_start_auth(b); |
927 | } | |
928 | ||
929 | int bus_socket_exec(sd_bus *b) { | |
e82c9509 | 930 | int s[2], r; |
a7e3212d LP |
931 | |
932 | assert(b); | |
e82c9509 LP |
933 | assert(b->input_fd < 0); |
934 | assert(b->output_fd < 0); | |
a7e3212d | 935 | assert(b->exec_path); |
392cf1d0 | 936 | assert(b->busexec_pid == 0); |
a7e3212d | 937 | |
e82c9509 LP |
938 | r = socketpair(AF_UNIX, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, s); |
939 | if (r < 0) | |
a7e3212d LP |
940 | return -errno; |
941 | ||
392cf1d0 | 942 | r = safe_fork_full("(sd-busexec)", s+1, 1, FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS, &b->busexec_pid); |
4c253ed1 | 943 | if (r < 0) { |
3d94f76c | 944 | safe_close_pair(s); |
4c253ed1 | 945 | return r; |
a7e3212d | 946 | } |
4c253ed1 | 947 | if (r == 0) { |
a7e3212d LP |
948 | /* Child */ |
949 | ||
2b33ab09 LP |
950 | if (rearrange_stdio(s[1], s[1], STDERR_FILENO) < 0) |
951 | _exit(EXIT_FAILURE); | |
a7e3212d | 952 | |
a7e3212d LP |
953 | if (b->exec_argv) |
954 | execvp(b->exec_path, b->exec_argv); | |
955 | else { | |
956 | const char *argv[] = { b->exec_path, NULL }; | |
957 | execvp(b->exec_path, (char**) argv); | |
958 | } | |
959 | ||
960 | _exit(EXIT_FAILURE); | |
961 | } | |
962 | ||
03e334a1 | 963 | safe_close(s[1]); |
7fe2903c | 964 | b->output_fd = b->input_fd = fd_move_above_stdio(s[0]); |
a7e3212d | 965 | |
8f04d2eb | 966 | bus_socket_setup(b); |
e1d337d4 | 967 | |
a7e3212d LP |
968 | return bus_socket_start_auth(b); |
969 | } | |
970 | ||
971 | int bus_socket_take_fd(sd_bus *b) { | |
a7e3212d LP |
972 | assert(b); |
973 | ||
8f04d2eb | 974 | bus_socket_setup(b); |
a7e3212d LP |
975 | |
976 | return bus_socket_start_auth(b); | |
977 | } | |
978 | ||
979 | int bus_socket_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) { | |
a7e3212d LP |
980 | struct iovec *iov; |
981 | ssize_t k; | |
982 | size_t n; | |
983 | unsigned j; | |
bc7fd8cd | 984 | int r; |
a7e3212d LP |
985 | |
986 | assert(bus); | |
987 | assert(m); | |
988 | assert(idx); | |
945c2931 | 989 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 990 | |
6629161f | 991 | if (*idx >= BUS_MESSAGE_SIZE(m)) |
a7e3212d | 992 | return 0; |
a7e3212d | 993 | |
bc7fd8cd LP |
994 | r = bus_message_setup_iovec(m); |
995 | if (r < 0) | |
996 | return r; | |
2100fa10 | 997 | |
a7e3212d LP |
998 | n = m->n_iovec * sizeof(struct iovec); |
999 | iov = alloca(n); | |
75f32f04 | 1000 | memcpy_safe(iov, m->iovec, n); |
a7e3212d LP |
1001 | |
1002 | j = 0; | |
1003 | iovec_advance(iov, &j, *idx); | |
1004 | ||
15d5af81 LP |
1005 | if (bus->prefer_writev) |
1006 | k = writev(bus->output_fd, iov, m->n_iovec); | |
1007 | else { | |
7f4e6a1c ZJS |
1008 | struct msghdr mh = { |
1009 | .msg_iov = iov, | |
1010 | .msg_iovlen = m->n_iovec, | |
1011 | }; | |
15d5af81 | 1012 | |
f29eef2e | 1013 | if (m->n_fds > 0 && *idx == 0) { |
15d5af81 | 1014 | struct cmsghdr *control; |
15d5af81 | 1015 | |
7f4e6a1c ZJS |
1016 | mh.msg_control = control = alloca(CMSG_SPACE(sizeof(int) * m->n_fds)); |
1017 | mh.msg_controllen = control->cmsg_len = CMSG_LEN(sizeof(int) * m->n_fds); | |
15d5af81 LP |
1018 | control->cmsg_level = SOL_SOCKET; |
1019 | control->cmsg_type = SCM_RIGHTS; | |
15d5af81 LP |
1020 | memcpy(CMSG_DATA(control), m->fds, sizeof(int) * m->n_fds); |
1021 | } | |
1022 | ||
15d5af81 LP |
1023 | k = sendmsg(bus->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); |
1024 | if (k < 0 && errno == ENOTSOCK) { | |
1025 | bus->prefer_writev = true; | |
1026 | k = writev(bus->output_fd, iov, m->n_iovec); | |
1027 | } | |
1028 | } | |
a7e3212d | 1029 | |
a7e3212d LP |
1030 | if (k < 0) |
1031 | return errno == EAGAIN ? 0 : -errno; | |
1032 | ||
1033 | *idx += (size_t) k; | |
1034 | return 1; | |
1035 | } | |
1036 | ||
1037 | static int bus_socket_read_message_need(sd_bus *bus, size_t *need) { | |
1038 | uint32_t a, b; | |
1039 | uint8_t e; | |
1040 | uint64_t sum; | |
1041 | ||
1042 | assert(bus); | |
1043 | assert(need); | |
945c2931 | 1044 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1045 | |
1046 | if (bus->rbuffer_size < sizeof(struct bus_header)) { | |
1047 | *need = sizeof(struct bus_header) + 8; | |
1048 | ||
1049 | /* Minimum message size: | |
1050 | * | |
1051 | * Header + | |
1052 | * | |
1053 | * Method Call: +2 string headers | |
1054 | * Signal: +3 string headers | |
1055 | * Method Error: +1 string headers | |
1056 | * +1 uint32 headers | |
1057 | * Method Reply: +1 uint32 headers | |
1058 | * | |
1059 | * A string header is at least 9 bytes | |
1060 | * A uint32 header is at least 8 bytes | |
1061 | * | |
1062 | * Hence the minimum message size of a valid message | |
1063 | * is header + 8 bytes */ | |
1064 | ||
1065 | return 0; | |
1066 | } | |
1067 | ||
1068 | a = ((const uint32_t*) bus->rbuffer)[1]; | |
1069 | b = ((const uint32_t*) bus->rbuffer)[3]; | |
1070 | ||
1071 | e = ((const uint8_t*) bus->rbuffer)[0]; | |
0461f8cd | 1072 | if (e == BUS_LITTLE_ENDIAN) { |
a7e3212d LP |
1073 | a = le32toh(a); |
1074 | b = le32toh(b); | |
0461f8cd | 1075 | } else if (e == BUS_BIG_ENDIAN) { |
a7e3212d LP |
1076 | a = be32toh(a); |
1077 | b = be32toh(b); | |
1078 | } else | |
1079 | return -EBADMSG; | |
1080 | ||
1081 | sum = (uint64_t) sizeof(struct bus_header) + (uint64_t) ALIGN_TO(b, 8) + (uint64_t) a; | |
1082 | if (sum >= BUS_MESSAGE_SIZE_MAX) | |
1083 | return -ENOBUFS; | |
1084 | ||
1085 | *need = (size_t) sum; | |
1086 | return 0; | |
1087 | } | |
1088 | ||
7d22c717 | 1089 | static int bus_socket_make_message(sd_bus *bus, size_t size) { |
a7e3212d LP |
1090 | sd_bus_message *t; |
1091 | void *b; | |
1092 | int r; | |
1093 | ||
1094 | assert(bus); | |
a7e3212d | 1095 | assert(bus->rbuffer_size >= size); |
945c2931 | 1096 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 1097 | |
7adc46fc LP |
1098 | r = bus_rqueue_make_room(bus); |
1099 | if (r < 0) | |
1100 | return r; | |
1101 | ||
a7e3212d LP |
1102 | if (bus->rbuffer_size > size) { |
1103 | b = memdup((const uint8_t*) bus->rbuffer + size, | |
1104 | bus->rbuffer_size - size); | |
1105 | if (!b) | |
1106 | return -ENOMEM; | |
1107 | } else | |
1108 | b = NULL; | |
1109 | ||
df2d202e LP |
1110 | r = bus_message_from_malloc(bus, |
1111 | bus->rbuffer, size, | |
a7e3212d | 1112 | bus->fds, bus->n_fds, |
038f9863 | 1113 | NULL, |
a7e3212d LP |
1114 | &t); |
1115 | if (r < 0) { | |
1116 | free(b); | |
1117 | return r; | |
1118 | } | |
1119 | ||
1120 | bus->rbuffer = b; | |
1121 | bus->rbuffer_size -= size; | |
1122 | ||
1123 | bus->fds = NULL; | |
1124 | bus->n_fds = 0; | |
1125 | ||
7adc46fc | 1126 | bus->rqueue[bus->rqueue_size++] = t; |
7d22c717 | 1127 | |
a7e3212d LP |
1128 | return 1; |
1129 | } | |
1130 | ||
7d22c717 | 1131 | int bus_socket_read_message(sd_bus *bus) { |
a7e3212d | 1132 | struct msghdr mh; |
7f4e6a1c | 1133 | struct iovec iov = {}; |
a7e3212d LP |
1134 | ssize_t k; |
1135 | size_t need; | |
1136 | int r; | |
1137 | void *b; | |
1138 | union { | |
1139 | struct cmsghdr cmsghdr; | |
d868f2a3 | 1140 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
a7e3212d | 1141 | } control; |
4d3a5b10 | 1142 | bool handle_cmsg = false; |
a7e3212d LP |
1143 | |
1144 | assert(bus); | |
945c2931 | 1145 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1146 | |
1147 | r = bus_socket_read_message_need(bus, &need); | |
1148 | if (r < 0) | |
1149 | return r; | |
1150 | ||
1151 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1152 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1153 | |
1154 | b = realloc(bus->rbuffer, need); | |
1155 | if (!b) | |
1156 | return -ENOMEM; | |
1157 | ||
1158 | bus->rbuffer = b; | |
1159 | ||
a7e3212d LP |
1160 | iov.iov_base = (uint8_t*) bus->rbuffer + bus->rbuffer_size; |
1161 | iov.iov_len = need - bus->rbuffer_size; | |
1162 | ||
15d5af81 LP |
1163 | if (bus->prefer_readv) |
1164 | k = readv(bus->input_fd, &iov, 1); | |
1165 | else { | |
1166 | zero(mh); | |
1167 | mh.msg_iov = &iov; | |
1168 | mh.msg_iovlen = 1; | |
1169 | mh.msg_control = &control; | |
1170 | mh.msg_controllen = sizeof(control); | |
1171 | ||
1172 | k = recvmsg(bus->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); | |
1173 | if (k < 0 && errno == ENOTSOCK) { | |
1174 | bus->prefer_readv = true; | |
1175 | k = readv(bus->input_fd, &iov, 1); | |
1176 | } else | |
1177 | handle_cmsg = true; | |
1178 | } | |
a7e3212d LP |
1179 | if (k < 0) |
1180 | return errno == EAGAIN ? 0 : -errno; | |
1181 | if (k == 0) | |
1182 | return -ECONNRESET; | |
1183 | ||
1184 | bus->rbuffer_size += k; | |
1185 | ||
2a1288ff LP |
1186 | if (handle_cmsg) { |
1187 | struct cmsghdr *cmsg; | |
1188 | ||
1189 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
1190 | if (cmsg->cmsg_level == SOL_SOCKET && |
1191 | cmsg->cmsg_type == SCM_RIGHTS) { | |
7fe2903c | 1192 | int n, *f, i; |
15d5af81 LP |
1193 | |
1194 | n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
1195 | ||
1196 | if (!bus->can_fds) { | |
1197 | /* Whut? We received fds but this | |
1198 | * isn't actually enabled? Close them, | |
1199 | * and fail */ | |
1200 | ||
1201 | close_many((int*) CMSG_DATA(cmsg), n); | |
1202 | return -EIO; | |
1203 | } | |
1204 | ||
62d74c78 | 1205 | f = reallocarray(bus->fds, bus->n_fds + n, sizeof(int)); |
15d5af81 LP |
1206 | if (!f) { |
1207 | close_many((int*) CMSG_DATA(cmsg), n); | |
1208 | return -ENOMEM; | |
1209 | } | |
1210 | ||
7fe2903c LP |
1211 | for (i = 0; i < n; i++) |
1212 | f[bus->n_fds++] = fd_move_above_stdio(((int*) CMSG_DATA(cmsg))[i]); | |
15d5af81 | 1213 | bus->fds = f; |
d868f2a3 ZJS |
1214 | } else |
1215 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
1216 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 1217 | } |
a7e3212d LP |
1218 | |
1219 | r = bus_socket_read_message_need(bus, &need); | |
1220 | if (r < 0) | |
1221 | return r; | |
1222 | ||
1223 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1224 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1225 | |
1226 | return 1; | |
1227 | } | |
1228 | ||
1229 | int bus_socket_process_opening(sd_bus *b) { | |
1230 | int error = 0; | |
1231 | socklen_t slen = sizeof(error); | |
b92bea5d ZJS |
1232 | struct pollfd p = { |
1233 | .fd = b->output_fd, | |
1234 | .events = POLLOUT, | |
1235 | }; | |
a7e3212d LP |
1236 | int r; |
1237 | ||
a7e3212d LP |
1238 | assert(b->state == BUS_OPENING); |
1239 | ||
a7e3212d LP |
1240 | r = poll(&p, 1, 0); |
1241 | if (r < 0) | |
1242 | return -errno; | |
1243 | ||
1244 | if (!(p.revents & (POLLOUT|POLLERR|POLLHUP))) | |
1245 | return 0; | |
1246 | ||
e82c9509 | 1247 | r = getsockopt(b->output_fd, SOL_SOCKET, SO_ERROR, &error, &slen); |
a7e3212d LP |
1248 | if (r < 0) |
1249 | b->last_connect_error = errno; | |
1250 | else if (error != 0) | |
1251 | b->last_connect_error = error; | |
1252 | else if (p.revents & (POLLERR|POLLHUP)) | |
1253 | b->last_connect_error = ECONNREFUSED; | |
1254 | else | |
1255 | return bus_socket_start_auth(b); | |
1256 | ||
1257 | return bus_next_address(b); | |
1258 | } | |
1259 | ||
1260 | int bus_socket_process_authenticating(sd_bus *b) { | |
1261 | int r; | |
1262 | ||
1263 | assert(b); | |
1264 | assert(b->state == BUS_AUTHENTICATING); | |
1265 | ||
1266 | if (now(CLOCK_MONOTONIC) >= b->auth_timeout) | |
1267 | return -ETIMEDOUT; | |
1268 | ||
1269 | r = bus_socket_write_auth(b); | |
1270 | if (r != 0) | |
1271 | return r; | |
1272 | ||
1273 | return bus_socket_read_auth(b); | |
1274 | } | |
8a5cd31e LP |
1275 | |
1276 | int bus_socket_process_watch_bind(sd_bus *b) { | |
1277 | int r, q; | |
1278 | ||
1279 | assert(b); | |
1280 | assert(b->state == BUS_WATCH_BIND); | |
1281 | assert(b->inotify_fd >= 0); | |
1282 | ||
1283 | r = flush_fd(b->inotify_fd); | |
1284 | if (r <= 0) | |
1285 | return r; | |
1286 | ||
1287 | log_debug("Got inotify event on bus %s.", strna(b->description)); | |
1288 | ||
1289 | /* We flushed events out of the inotify fd. In that case, maybe the socket is valid now? Let's try to connect | |
1290 | * to it again */ | |
1291 | ||
1292 | r = bus_socket_connect(b); | |
1293 | if (r < 0) | |
1294 | return r; | |
1295 | ||
1296 | q = bus_attach_io_events(b); | |
1297 | if (q < 0) | |
1298 | return q; | |
1299 | ||
1300 | q = bus_attach_inotify_event(b); | |
1301 | if (q < 0) | |
1302 | return q; | |
1303 | ||
1304 | return r; | |
1305 | } |