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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) { | |
d27b725a | 251 | const char *p; |
2181a7f5 | 252 | |
d27b725a LP |
253 | p = memory_startswith(s, m, word); |
254 | if (!p) | |
2181a7f5 LP |
255 | return false; |
256 | ||
d27b725a | 257 | return IN_SET(*p, 0, ' '); |
2181a7f5 LP |
258 | } |
259 | ||
260 | static int verify_anonymous_token(sd_bus *b, const char *p, size_t l) { | |
261 | _cleanup_free_ char *token = NULL; | |
30494563 TG |
262 | size_t len; |
263 | int r; | |
2181a7f5 LP |
264 | |
265 | if (!b->anonymous_auth) | |
266 | return 0; | |
267 | ||
268 | if (l <= 0) | |
269 | return 1; | |
270 | ||
271 | assert(p[0] == ' '); | |
272 | p++; l--; | |
273 | ||
274 | if (l % 2 != 0) | |
275 | return 0; | |
2181a7f5 | 276 | |
30494563 TG |
277 | r = unhexmem(p, l, (void **) &token, &len); |
278 | if (r < 0) | |
279 | return 0; | |
280 | ||
281 | if (memchr(token, 0, len)) | |
2181a7f5 LP |
282 | return 0; |
283 | ||
284 | return !!utf8_is_valid(token); | |
285 | } | |
286 | ||
287 | static int verify_external_token(sd_bus *b, const char *p, size_t l) { | |
288 | _cleanup_free_ char *token = NULL; | |
30494563 | 289 | size_t len; |
2181a7f5 LP |
290 | uid_t u; |
291 | int r; | |
292 | ||
293 | /* We don't do any real authentication here. Instead, we if | |
294 | * the owner of this bus wanted authentication he should have | |
295 | * checked SO_PEERCRED before even creating the bus object. */ | |
296 | ||
8411d2a2 | 297 | if (!b->anonymous_auth && !b->ucred_valid) |
2181a7f5 LP |
298 | return 0; |
299 | ||
300 | if (l <= 0) | |
301 | return 1; | |
302 | ||
303 | assert(p[0] == ' '); | |
304 | p++; l--; | |
305 | ||
306 | if (l % 2 != 0) | |
307 | return 0; | |
308 | ||
30494563 TG |
309 | r = unhexmem(p, l, (void**) &token, &len); |
310 | if (r < 0) | |
311 | return 0; | |
2181a7f5 | 312 | |
30494563 | 313 | if (memchr(token, 0, len)) |
2181a7f5 LP |
314 | return 0; |
315 | ||
316 | r = parse_uid(token, &u); | |
317 | if (r < 0) | |
318 | return 0; | |
319 | ||
8411d2a2 LP |
320 | /* We ignore the passed value if anonymous authentication is |
321 | * on anyway. */ | |
322 | if (!b->anonymous_auth && u != b->ucred.uid) | |
2181a7f5 LP |
323 | return 0; |
324 | ||
325 | return 1; | |
326 | } | |
327 | ||
328 | static int bus_socket_auth_write(sd_bus *b, const char *t) { | |
329 | char *p; | |
330 | size_t l; | |
331 | ||
332 | assert(b); | |
333 | assert(t); | |
334 | ||
335 | /* We only make use of the first iovec */ | |
945c2931 | 336 | assert(IN_SET(b->auth_index, 0, 1)); |
2181a7f5 LP |
337 | |
338 | l = strlen(t); | |
339 | p = malloc(b->auth_iovec[0].iov_len + l); | |
340 | if (!p) | |
341 | return -ENOMEM; | |
342 | ||
75f32f04 | 343 | memcpy_safe(p, b->auth_iovec[0].iov_base, b->auth_iovec[0].iov_len); |
2181a7f5 LP |
344 | memcpy(p + b->auth_iovec[0].iov_len, t, l); |
345 | ||
346 | b->auth_iovec[0].iov_base = p; | |
347 | b->auth_iovec[0].iov_len += l; | |
348 | ||
349 | free(b->auth_buffer); | |
350 | b->auth_buffer = p; | |
351 | b->auth_index = 0; | |
352 | return 0; | |
353 | } | |
354 | ||
355 | static int bus_socket_auth_write_ok(sd_bus *b) { | |
356 | char t[3 + 32 + 2 + 1]; | |
357 | ||
358 | assert(b); | |
359 | ||
5ffa8c81 | 360 | xsprintf(t, "OK " SD_ID128_FORMAT_STR "\r\n", SD_ID128_FORMAT_VAL(b->server_id)); |
2181a7f5 LP |
361 | |
362 | return bus_socket_auth_write(b, t); | |
363 | } | |
364 | ||
365 | static int bus_socket_auth_verify_server(sd_bus *b) { | |
366 | char *e; | |
367 | const char *line; | |
368 | size_t l; | |
369 | bool processed = false; | |
370 | int r; | |
371 | ||
372 | assert(b); | |
373 | ||
2b4ac889 | 374 | if (b->rbuffer_size < 1) |
2181a7f5 LP |
375 | return 0; |
376 | ||
377 | /* First char must be a NUL byte */ | |
378 | if (*(char*) b->rbuffer != 0) | |
379 | return -EIO; | |
380 | ||
2b4ac889 LP |
381 | if (b->rbuffer_size < 3) |
382 | return 0; | |
383 | ||
2181a7f5 LP |
384 | /* Begin with the first line */ |
385 | if (b->auth_rbegin <= 0) | |
386 | b->auth_rbegin = 1; | |
387 | ||
388 | for (;;) { | |
389 | /* Check if line is complete */ | |
390 | line = (char*) b->rbuffer + b->auth_rbegin; | |
391 | e = memmem(line, b->rbuffer_size - b->auth_rbegin, "\r\n", 2); | |
392 | if (!e) | |
393 | return processed; | |
394 | ||
395 | l = e - line; | |
396 | ||
397 | if (line_begins(line, l, "AUTH ANONYMOUS")) { | |
398 | ||
399 | r = verify_anonymous_token(b, line + 14, l - 14); | |
400 | if (r < 0) | |
401 | return r; | |
402 | if (r == 0) | |
403 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
404 | else { | |
405 | b->auth = BUS_AUTH_ANONYMOUS; | |
406 | r = bus_socket_auth_write_ok(b); | |
407 | } | |
408 | ||
409 | } else if (line_begins(line, l, "AUTH EXTERNAL")) { | |
410 | ||
411 | r = verify_external_token(b, line + 13, l - 13); | |
412 | if (r < 0) | |
413 | return r; | |
414 | if (r == 0) | |
415 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
416 | else { | |
417 | b->auth = BUS_AUTH_EXTERNAL; | |
418 | r = bus_socket_auth_write_ok(b); | |
419 | } | |
420 | ||
421 | } else if (line_begins(line, l, "AUTH")) | |
422 | r = bus_socket_auth_write(b, "REJECTED EXTERNAL ANONYMOUS\r\n"); | |
423 | else if (line_equals(line, l, "CANCEL") || | |
424 | line_begins(line, l, "ERROR")) { | |
425 | ||
426 | b->auth = _BUS_AUTH_INVALID; | |
427 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
428 | ||
429 | } else if (line_equals(line, l, "BEGIN")) { | |
430 | ||
431 | if (b->auth == _BUS_AUTH_INVALID) | |
432 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
433 | else { | |
434 | /* We can't leave from the auth phase | |
435 | * before we haven't written | |
436 | * everything queued, so let's check | |
437 | * that */ | |
438 | ||
439 | if (bus_socket_auth_needs_write(b)) | |
440 | return 1; | |
441 | ||
442 | b->rbuffer_size -= (e + 2 - (char*) b->rbuffer); | |
443 | memmove(b->rbuffer, e + 2, b->rbuffer_size); | |
444 | return bus_start_running(b); | |
445 | } | |
446 | ||
447 | } else if (line_begins(line, l, "DATA")) { | |
448 | ||
449 | if (b->auth == _BUS_AUTH_INVALID) | |
450 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
451 | else { | |
452 | if (b->auth == BUS_AUTH_ANONYMOUS) | |
453 | r = verify_anonymous_token(b, line + 4, l - 4); | |
454 | else | |
455 | r = verify_external_token(b, line + 4, l - 4); | |
456 | ||
457 | if (r < 0) | |
458 | return r; | |
459 | if (r == 0) { | |
460 | b->auth = _BUS_AUTH_INVALID; | |
461 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
462 | } else | |
463 | r = bus_socket_auth_write_ok(b); | |
464 | } | |
465 | } else if (line_equals(line, l, "NEGOTIATE_UNIX_FD")) { | |
c7db1984 | 466 | if (b->auth == _BUS_AUTH_INVALID || !b->accept_fd) |
2181a7f5 LP |
467 | r = bus_socket_auth_write(b, "ERROR\r\n"); |
468 | else { | |
469 | b->can_fds = true; | |
470 | r = bus_socket_auth_write(b, "AGREE_UNIX_FD\r\n"); | |
471 | } | |
472 | } else | |
473 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
474 | ||
475 | if (r < 0) | |
476 | return r; | |
477 | ||
478 | b->auth_rbegin = e + 2 - (char*) b->rbuffer; | |
479 | ||
480 | processed = true; | |
481 | } | |
482 | } | |
483 | ||
484 | static int bus_socket_auth_verify(sd_bus *b) { | |
485 | assert(b); | |
486 | ||
487 | if (b->is_server) | |
488 | return bus_socket_auth_verify_server(b); | |
489 | else | |
490 | return bus_socket_auth_verify_client(b); | |
491 | } | |
492 | ||
a7e3212d LP |
493 | static int bus_socket_read_auth(sd_bus *b) { |
494 | struct msghdr mh; | |
7f4e6a1c | 495 | struct iovec iov = {}; |
a7e3212d LP |
496 | size_t n; |
497 | ssize_t k; | |
498 | int r; | |
499 | void *p; | |
2181a7f5 LP |
500 | union { |
501 | struct cmsghdr cmsghdr; | |
d868f2a3 | 502 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
2181a7f5 | 503 | } control; |
15d5af81 | 504 | bool handle_cmsg = false; |
a7e3212d LP |
505 | |
506 | assert(b); | |
2181a7f5 | 507 | assert(b->state == BUS_AUTHENTICATING); |
a7e3212d LP |
508 | |
509 | r = bus_socket_auth_verify(b); | |
510 | if (r != 0) | |
511 | return r; | |
512 | ||
9607d947 | 513 | n = MAX(256u, b->rbuffer_size * 2); |
a7e3212d LP |
514 | |
515 | if (n > BUS_AUTH_SIZE_MAX) | |
516 | n = BUS_AUTH_SIZE_MAX; | |
517 | ||
518 | if (b->rbuffer_size >= n) | |
519 | return -ENOBUFS; | |
520 | ||
521 | p = realloc(b->rbuffer, n); | |
522 | if (!p) | |
523 | return -ENOMEM; | |
524 | ||
525 | b->rbuffer = p; | |
526 | ||
a7e3212d LP |
527 | iov.iov_base = (uint8_t*) b->rbuffer + b->rbuffer_size; |
528 | iov.iov_len = n - b->rbuffer_size; | |
529 | ||
15d5af81 LP |
530 | if (b->prefer_readv) |
531 | k = readv(b->input_fd, &iov, 1); | |
532 | else { | |
533 | zero(mh); | |
534 | mh.msg_iov = &iov; | |
535 | mh.msg_iovlen = 1; | |
536 | mh.msg_control = &control; | |
537 | mh.msg_controllen = sizeof(control); | |
538 | ||
539 | k = recvmsg(b->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); | |
540 | if (k < 0 && errno == ENOTSOCK) { | |
541 | b->prefer_readv = true; | |
542 | k = readv(b->input_fd, &iov, 1); | |
543 | } else | |
544 | handle_cmsg = true; | |
545 | } | |
a7e3212d LP |
546 | if (k < 0) |
547 | return errno == EAGAIN ? 0 : -errno; | |
548 | if (k == 0) | |
549 | return -ECONNRESET; | |
550 | ||
551 | b->rbuffer_size += k; | |
552 | ||
2a1288ff LP |
553 | if (handle_cmsg) { |
554 | struct cmsghdr *cmsg; | |
555 | ||
556 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
557 | if (cmsg->cmsg_level == SOL_SOCKET && |
558 | cmsg->cmsg_type == SCM_RIGHTS) { | |
559 | int j; | |
560 | ||
561 | /* Whut? We received fds during the auth | |
562 | * protocol? Somebody is playing games with | |
563 | * us. Close them all, and fail */ | |
564 | j = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
565 | close_many((int*) CMSG_DATA(cmsg), j); | |
566 | return -EIO; | |
d868f2a3 ZJS |
567 | } else |
568 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
569 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 570 | } |
2181a7f5 | 571 | |
a7e3212d LP |
572 | r = bus_socket_auth_verify(b); |
573 | if (r != 0) | |
574 | return r; | |
575 | ||
576 | return 1; | |
577 | } | |
578 | ||
8f04d2eb | 579 | void bus_socket_setup(sd_bus *b) { |
a7e3212d LP |
580 | assert(b); |
581 | ||
aec6d91f | 582 | /* Increase the buffers to 8 MB */ |
6ae22ffb LP |
583 | (void) fd_inc_rcvbuf(b->input_fd, SNDBUF_SIZE); |
584 | (void) fd_inc_sndbuf(b->output_fd, SNDBUF_SIZE); | |
a7e3212d | 585 | |
e1d337d4 | 586 | b->message_version = 1; |
0f437184 | 587 | b->message_endian = 0; |
8f04d2eb | 588 | } |
e1d337d4 | 589 | |
8f04d2eb | 590 | static void bus_get_peercred(sd_bus *b) { |
c4e6556c ZJS |
591 | int r; |
592 | ||
8f04d2eb | 593 | assert(b); |
18ac4643 LP |
594 | assert(!b->ucred_valid); |
595 | assert(!b->label); | |
596 | assert(b->n_groups == (size_t) -1); | |
8f04d2eb LP |
597 | |
598 | /* Get the peer for socketpair() sockets */ | |
eff05270 | 599 | b->ucred_valid = getpeercred(b->input_fd, &b->ucred) >= 0; |
c4e6556c ZJS |
600 | |
601 | /* Get the SELinux context of the peer */ | |
db7d1dca | 602 | r = getpeersec(b->input_fd, &b->label); |
18ac4643 | 603 | if (r < 0 && !IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) |
db7d1dca | 604 | log_debug_errno(r, "Failed to determine peer security context: %m"); |
18ac4643 LP |
605 | |
606 | /* Get the list of auxiliary groups of the peer */ | |
607 | r = getpeergroups(b->input_fd, &b->groups); | |
c599b325 | 608 | if (r >= 0) |
18ac4643 | 609 | b->n_groups = (size_t) r; |
c599b325 ZJS |
610 | else if (!IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) |
611 | log_debug_errno(r, "Failed to determine peer's group list: %m"); | |
a7e3212d LP |
612 | } |
613 | ||
2181a7f5 | 614 | static int bus_socket_start_auth_client(sd_bus *b) { |
a7e3212d | 615 | size_t l; |
2181a7f5 | 616 | const char *auth_suffix, *auth_prefix; |
a7e3212d LP |
617 | |
618 | assert(b); | |
619 | ||
2181a7f5 LP |
620 | if (b->anonymous_auth) { |
621 | auth_prefix = "\0AUTH ANONYMOUS "; | |
a7e3212d | 622 | |
2181a7f5 LP |
623 | /* For ANONYMOUS auth we send some arbitrary "trace" string */ |
624 | l = 9; | |
625 | b->auth_buffer = hexmem("anonymous", l); | |
626 | } else { | |
5ffa8c81 | 627 | char text[DECIMAL_STR_MAX(uid_t) + 1]; |
a7e3212d | 628 | |
2181a7f5 | 629 | auth_prefix = "\0AUTH EXTERNAL "; |
a7e3212d | 630 | |
5ffa8c81 | 631 | xsprintf(text, UID_FMT, geteuid()); |
a7e3212d | 632 | |
2181a7f5 LP |
633 | l = strlen(text); |
634 | b->auth_buffer = hexmem(text, l); | |
635 | } | |
636 | ||
637 | if (!b->auth_buffer) | |
a7e3212d LP |
638 | return -ENOMEM; |
639 | ||
c7db1984 | 640 | if (b->accept_fd) |
2181a7f5 LP |
641 | auth_suffix = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n"; |
642 | else | |
643 | auth_suffix = "\r\nBEGIN\r\n"; | |
a7e3212d LP |
644 | |
645 | b->auth_iovec[0].iov_base = (void*) auth_prefix; | |
2181a7f5 LP |
646 | b->auth_iovec[0].iov_len = 1 + strlen(auth_prefix + 1); |
647 | b->auth_iovec[1].iov_base = (void*) b->auth_buffer; | |
a7e3212d LP |
648 | b->auth_iovec[1].iov_len = l * 2; |
649 | b->auth_iovec[2].iov_base = (void*) auth_suffix; | |
650 | b->auth_iovec[2].iov_len = strlen(auth_suffix); | |
a7e3212d LP |
651 | |
652 | return bus_socket_write_auth(b); | |
653 | } | |
654 | ||
a7893c6b | 655 | int bus_socket_start_auth(sd_bus *b) { |
2181a7f5 LP |
656 | assert(b); |
657 | ||
8f04d2eb LP |
658 | bus_get_peercred(b); |
659 | ||
3e0e196e | 660 | bus_set_state(b, BUS_AUTHENTICATING); |
036d61b3 | 661 | b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_AUTH_TIMEOUT; |
2181a7f5 | 662 | |
9ab32f9d | 663 | if (sd_is_socket(b->input_fd, AF_UNIX, 0, 0) <= 0) |
c7db1984 | 664 | b->accept_fd = false; |
2181a7f5 | 665 | |
9ab32f9d LP |
666 | if (b->output_fd != b->input_fd) |
667 | if (sd_is_socket(b->output_fd, AF_UNIX, 0, 0) <= 0) | |
c7db1984 | 668 | b->accept_fd = false; |
e82c9509 | 669 | |
2181a7f5 LP |
670 | if (b->is_server) |
671 | return bus_socket_read_auth(b); | |
672 | else | |
673 | return bus_socket_start_auth_client(b); | |
674 | } | |
675 | ||
8a5cd31e LP |
676 | static int bus_socket_inotify_setup(sd_bus *b) { |
677 | _cleanup_free_ int *new_watches = NULL; | |
678 | _cleanup_free_ char *absolute = NULL; | |
679 | size_t n_allocated = 0, n = 0, done = 0, i; | |
680 | unsigned max_follow = 32; | |
681 | const char *p; | |
682 | int wd, r; | |
683 | ||
684 | assert(b); | |
685 | assert(b->watch_bind); | |
686 | assert(b->sockaddr.sa.sa_family == AF_UNIX); | |
687 | assert(b->sockaddr.un.sun_path[0] != 0); | |
688 | ||
689 | /* Sets up an inotify fd in case watch_bind is enabled: wait until the configured AF_UNIX file system socket | |
690 | * appears before connecting to it. The implemented is pretty simplistic: we just subscribe to relevant changes | |
691 | * to all prefix components of the path, and every time we get an event for that we try to reconnect again, | |
692 | * without actually caring what precisely the event we got told us. If we still can't connect we re-subscribe | |
693 | * to all relevant changes of anything in the path, so that our watches include any possibly newly created path | |
694 | * components. */ | |
695 | ||
696 | if (b->inotify_fd < 0) { | |
697 | b->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
698 | if (b->inotify_fd < 0) | |
699 | return -errno; | |
7fe2903c LP |
700 | |
701 | b->inotify_fd = fd_move_above_stdio(b->inotify_fd); | |
8a5cd31e LP |
702 | } |
703 | ||
704 | /* Make sure the path is NUL terminated */ | |
705 | p = strndupa(b->sockaddr.un.sun_path, sizeof(b->sockaddr.un.sun_path)); | |
706 | ||
707 | /* Make sure the path is absolute */ | |
708 | r = path_make_absolute_cwd(p, &absolute); | |
709 | if (r < 0) | |
710 | goto fail; | |
711 | ||
712 | /* Watch all parent directories, and don't mind any prefix that doesn't exist yet. For the innermost directory | |
713 | * that exists we want to know when files are created or moved into it. For all parents of it we just care if | |
714 | * they are removed or renamed. */ | |
715 | ||
716 | if (!GREEDY_REALLOC(new_watches, n_allocated, n + 1)) { | |
717 | r = -ENOMEM; | |
718 | goto fail; | |
719 | } | |
720 | ||
721 | /* Start with the top-level directory, which is a bit simpler than the rest, since it can't be a symlink, and | |
722 | * always exists */ | |
723 | wd = inotify_add_watch(b->inotify_fd, "/", IN_CREATE|IN_MOVED_TO); | |
724 | if (wd < 0) { | |
725 | r = log_debug_errno(errno, "Failed to add inotify watch on /: %m"); | |
726 | goto fail; | |
727 | } else | |
728 | new_watches[n++] = wd; | |
729 | ||
730 | for (;;) { | |
731 | _cleanup_free_ char *component = NULL, *prefix = NULL, *destination = NULL; | |
732 | size_t n_slashes, n_component; | |
733 | char *c = NULL; | |
734 | ||
735 | n_slashes = strspn(absolute + done, "/"); | |
736 | n_component = n_slashes + strcspn(absolute + done + n_slashes, "/"); | |
737 | ||
738 | if (n_component == 0) /* The end */ | |
739 | break; | |
740 | ||
741 | component = strndup(absolute + done, n_component); | |
742 | if (!component) { | |
743 | r = -ENOMEM; | |
744 | goto fail; | |
745 | } | |
746 | ||
747 | /* A trailing slash? That's a directory, and not a socket then */ | |
748 | if (path_equal(component, "/")) { | |
749 | r = -EISDIR; | |
750 | goto fail; | |
751 | } | |
752 | ||
753 | /* A single dot? Let's eat this up */ | |
754 | if (path_equal(component, "/.")) { | |
755 | done += n_component; | |
756 | continue; | |
757 | } | |
758 | ||
759 | prefix = strndup(absolute, done + n_component); | |
760 | if (!prefix) { | |
761 | r = -ENOMEM; | |
762 | goto fail; | |
763 | } | |
764 | ||
765 | if (!GREEDY_REALLOC(new_watches, n_allocated, n + 1)) { | |
766 | r = -ENOMEM; | |
767 | goto fail; | |
768 | } | |
769 | ||
770 | wd = inotify_add_watch(b->inotify_fd, prefix, IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO|IN_DONT_FOLLOW); | |
771 | log_debug("Added inotify watch for %s on bus %s: %i", prefix, strna(b->description), wd); | |
772 | ||
773 | if (wd < 0) { | |
774 | if (IN_SET(errno, ENOENT, ELOOP)) | |
775 | break; /* This component doesn't exist yet, or the path contains a cyclic symlink right now */ | |
776 | ||
945403e6 | 777 | r = log_debug_errno(errno, "Failed to add inotify watch on %s: %m", empty_to_root(prefix)); |
8a5cd31e LP |
778 | goto fail; |
779 | } else | |
780 | new_watches[n++] = wd; | |
781 | ||
782 | /* Check if this is possibly a symlink. If so, let's follow it and watch it too. */ | |
783 | r = readlink_malloc(prefix, &destination); | |
784 | if (r == -EINVAL) { /* not a symlink */ | |
785 | done += n_component; | |
786 | continue; | |
787 | } | |
788 | if (r < 0) | |
789 | goto fail; | |
790 | ||
791 | if (isempty(destination)) { /* Empty symlink target? Yuck! */ | |
792 | r = -EINVAL; | |
793 | goto fail; | |
794 | } | |
795 | ||
796 | if (max_follow <= 0) { /* Let's make sure we don't follow symlinks forever */ | |
797 | r = -ELOOP; | |
798 | goto fail; | |
799 | } | |
800 | ||
801 | if (path_is_absolute(destination)) { | |
802 | /* For absolute symlinks we build the new path and start anew */ | |
803 | c = strjoin(destination, absolute + done + n_component); | |
804 | done = 0; | |
805 | } else { | |
806 | _cleanup_free_ char *t = NULL; | |
807 | ||
808 | /* For relative symlinks we replace the last component, and try again */ | |
809 | t = strndup(absolute, done); | |
810 | if (!t) | |
811 | return -ENOMEM; | |
812 | ||
813 | c = strjoin(t, "/", destination, absolute + done + n_component); | |
814 | } | |
815 | if (!c) { | |
816 | r = -ENOMEM; | |
817 | goto fail; | |
818 | } | |
819 | ||
820 | free(absolute); | |
821 | absolute = c; | |
822 | ||
823 | max_follow--; | |
824 | } | |
825 | ||
826 | /* And now, let's remove all watches from the previous iteration we don't need anymore */ | |
827 | for (i = 0; i < b->n_inotify_watches; i++) { | |
828 | bool found = false; | |
829 | size_t j; | |
830 | ||
831 | for (j = 0; j < n; j++) | |
832 | if (new_watches[j] == b->inotify_watches[i]) { | |
833 | found = true; | |
834 | break; | |
835 | } | |
836 | ||
837 | if (found) | |
838 | continue; | |
839 | ||
840 | (void) inotify_rm_watch(b->inotify_fd, b->inotify_watches[i]); | |
841 | } | |
842 | ||
843 | free_and_replace(b->inotify_watches, new_watches); | |
844 | b->n_inotify_watches = n; | |
845 | ||
846 | return 0; | |
847 | ||
848 | fail: | |
849 | bus_close_inotify_fd(b); | |
850 | return r; | |
851 | } | |
852 | ||
a7e3212d | 853 | int bus_socket_connect(sd_bus *b) { |
8a5cd31e | 854 | bool inotify_done = false; |
a7e3212d LP |
855 | int r; |
856 | ||
857 | assert(b); | |
a7e3212d | 858 | |
8a5cd31e LP |
859 | for (;;) { |
860 | assert(b->input_fd < 0); | |
861 | assert(b->output_fd < 0); | |
862 | assert(b->sockaddr.sa.sa_family != AF_UNSPEC); | |
a7e3212d | 863 | |
8a5cd31e LP |
864 | b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
865 | if (b->input_fd < 0) | |
866 | return -errno; | |
e82c9509 | 867 | |
7fe2903c LP |
868 | b->input_fd = fd_move_above_stdio(b->input_fd); |
869 | ||
8a5cd31e LP |
870 | b->output_fd = b->input_fd; |
871 | bus_socket_setup(b); | |
a7e3212d | 872 | |
8a5cd31e LP |
873 | if (connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size) < 0) { |
874 | if (errno == EINPROGRESS) { | |
a7e3212d | 875 | |
8a5cd31e LP |
876 | /* If we have any inotify watches open, close them now, we don't need them anymore, as |
877 | * we have successfully initiated a connection */ | |
878 | bus_close_inotify_fd(b); | |
879 | ||
880 | /* Note that very likely we are already in BUS_OPENING state here, as we enter it when | |
881 | * we start parsing the address string. The only reason we set the state explicitly | |
882 | * here, is to undo BUS_WATCH_BIND, in case we did the inotify magic. */ | |
3e0e196e | 883 | bus_set_state(b, BUS_OPENING); |
8a5cd31e LP |
884 | return 1; |
885 | } | |
886 | ||
887 | if (IN_SET(errno, ENOENT, ECONNREFUSED) && /* ENOENT → unix socket doesn't exist at all; ECONNREFUSED → unix socket stale */ | |
888 | b->watch_bind && | |
889 | b->sockaddr.sa.sa_family == AF_UNIX && | |
890 | b->sockaddr.un.sun_path[0] != 0) { | |
891 | ||
892 | /* This connection attempt failed, let's release the socket for now, and start with a | |
893 | * fresh one when reconnecting. */ | |
894 | bus_close_io_fds(b); | |
895 | ||
896 | if (inotify_done) { | |
897 | /* inotify set up already, don't do it again, just return now, and remember | |
898 | * that we are waiting for inotify events now. */ | |
3e0e196e | 899 | bus_set_state(b, BUS_WATCH_BIND); |
8a5cd31e LP |
900 | return 1; |
901 | } | |
902 | ||
903 | /* This is a file system socket, and the inotify logic is enabled. Let's create the necessary inotify fd. */ | |
904 | r = bus_socket_inotify_setup(b); | |
905 | if (r < 0) | |
906 | return r; | |
907 | ||
908 | /* Let's now try to connect a second time, because in theory there's otherwise a race | |
909 | * here: the socket might have been created in the time between our first connect() and | |
910 | * the time we set up the inotify logic. But let's remember that we set up inotify now, | |
911 | * so that we don't do the connect() more than twice. */ | |
912 | inotify_done = true; | |
913 | ||
914 | } else | |
915 | return -errno; | |
916 | } else | |
917 | break; | |
a7e3212d LP |
918 | } |
919 | ||
8a5cd31e LP |
920 | /* Yay, established, we don't need no inotify anymore! */ |
921 | bus_close_inotify_fd(b); | |
922 | ||
a7e3212d LP |
923 | return bus_socket_start_auth(b); |
924 | } | |
925 | ||
926 | int bus_socket_exec(sd_bus *b) { | |
e82c9509 | 927 | int s[2], r; |
a7e3212d LP |
928 | |
929 | assert(b); | |
e82c9509 LP |
930 | assert(b->input_fd < 0); |
931 | assert(b->output_fd < 0); | |
a7e3212d | 932 | assert(b->exec_path); |
392cf1d0 | 933 | assert(b->busexec_pid == 0); |
a7e3212d | 934 | |
e82c9509 LP |
935 | r = socketpair(AF_UNIX, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, s); |
936 | if (r < 0) | |
a7e3212d LP |
937 | return -errno; |
938 | ||
392cf1d0 | 939 | r = safe_fork_full("(sd-busexec)", s+1, 1, FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS, &b->busexec_pid); |
4c253ed1 | 940 | if (r < 0) { |
3d94f76c | 941 | safe_close_pair(s); |
4c253ed1 | 942 | return r; |
a7e3212d | 943 | } |
4c253ed1 | 944 | if (r == 0) { |
a7e3212d LP |
945 | /* Child */ |
946 | ||
2b33ab09 LP |
947 | if (rearrange_stdio(s[1], s[1], STDERR_FILENO) < 0) |
948 | _exit(EXIT_FAILURE); | |
a7e3212d | 949 | |
a7e3212d LP |
950 | if (b->exec_argv) |
951 | execvp(b->exec_path, b->exec_argv); | |
952 | else { | |
953 | const char *argv[] = { b->exec_path, NULL }; | |
954 | execvp(b->exec_path, (char**) argv); | |
955 | } | |
956 | ||
957 | _exit(EXIT_FAILURE); | |
958 | } | |
959 | ||
03e334a1 | 960 | safe_close(s[1]); |
7fe2903c | 961 | b->output_fd = b->input_fd = fd_move_above_stdio(s[0]); |
a7e3212d | 962 | |
8f04d2eb | 963 | bus_socket_setup(b); |
e1d337d4 | 964 | |
a7e3212d LP |
965 | return bus_socket_start_auth(b); |
966 | } | |
967 | ||
968 | int bus_socket_take_fd(sd_bus *b) { | |
a7e3212d LP |
969 | assert(b); |
970 | ||
8f04d2eb | 971 | bus_socket_setup(b); |
a7e3212d LP |
972 | |
973 | return bus_socket_start_auth(b); | |
974 | } | |
975 | ||
976 | int bus_socket_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) { | |
a7e3212d LP |
977 | struct iovec *iov; |
978 | ssize_t k; | |
979 | size_t n; | |
980 | unsigned j; | |
bc7fd8cd | 981 | int r; |
a7e3212d LP |
982 | |
983 | assert(bus); | |
984 | assert(m); | |
985 | assert(idx); | |
945c2931 | 986 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 987 | |
6629161f | 988 | if (*idx >= BUS_MESSAGE_SIZE(m)) |
a7e3212d | 989 | return 0; |
a7e3212d | 990 | |
bc7fd8cd LP |
991 | r = bus_message_setup_iovec(m); |
992 | if (r < 0) | |
993 | return r; | |
2100fa10 | 994 | |
a7e3212d LP |
995 | n = m->n_iovec * sizeof(struct iovec); |
996 | iov = alloca(n); | |
75f32f04 | 997 | memcpy_safe(iov, m->iovec, n); |
a7e3212d LP |
998 | |
999 | j = 0; | |
1000 | iovec_advance(iov, &j, *idx); | |
1001 | ||
15d5af81 LP |
1002 | if (bus->prefer_writev) |
1003 | k = writev(bus->output_fd, iov, m->n_iovec); | |
1004 | else { | |
7f4e6a1c ZJS |
1005 | struct msghdr mh = { |
1006 | .msg_iov = iov, | |
1007 | .msg_iovlen = m->n_iovec, | |
1008 | }; | |
15d5af81 | 1009 | |
f29eef2e | 1010 | if (m->n_fds > 0 && *idx == 0) { |
15d5af81 | 1011 | struct cmsghdr *control; |
15d5af81 | 1012 | |
7f4e6a1c ZJS |
1013 | mh.msg_control = control = alloca(CMSG_SPACE(sizeof(int) * m->n_fds)); |
1014 | mh.msg_controllen = control->cmsg_len = CMSG_LEN(sizeof(int) * m->n_fds); | |
15d5af81 LP |
1015 | control->cmsg_level = SOL_SOCKET; |
1016 | control->cmsg_type = SCM_RIGHTS; | |
15d5af81 LP |
1017 | memcpy(CMSG_DATA(control), m->fds, sizeof(int) * m->n_fds); |
1018 | } | |
1019 | ||
15d5af81 LP |
1020 | k = sendmsg(bus->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); |
1021 | if (k < 0 && errno == ENOTSOCK) { | |
1022 | bus->prefer_writev = true; | |
1023 | k = writev(bus->output_fd, iov, m->n_iovec); | |
1024 | } | |
1025 | } | |
a7e3212d | 1026 | |
a7e3212d LP |
1027 | if (k < 0) |
1028 | return errno == EAGAIN ? 0 : -errno; | |
1029 | ||
1030 | *idx += (size_t) k; | |
1031 | return 1; | |
1032 | } | |
1033 | ||
1034 | static int bus_socket_read_message_need(sd_bus *bus, size_t *need) { | |
1035 | uint32_t a, b; | |
1036 | uint8_t e; | |
1037 | uint64_t sum; | |
1038 | ||
1039 | assert(bus); | |
1040 | assert(need); | |
945c2931 | 1041 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1042 | |
1043 | if (bus->rbuffer_size < sizeof(struct bus_header)) { | |
1044 | *need = sizeof(struct bus_header) + 8; | |
1045 | ||
1046 | /* Minimum message size: | |
1047 | * | |
1048 | * Header + | |
1049 | * | |
1050 | * Method Call: +2 string headers | |
1051 | * Signal: +3 string headers | |
1052 | * Method Error: +1 string headers | |
1053 | * +1 uint32 headers | |
1054 | * Method Reply: +1 uint32 headers | |
1055 | * | |
1056 | * A string header is at least 9 bytes | |
1057 | * A uint32 header is at least 8 bytes | |
1058 | * | |
1059 | * Hence the minimum message size of a valid message | |
1060 | * is header + 8 bytes */ | |
1061 | ||
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | a = ((const uint32_t*) bus->rbuffer)[1]; | |
1066 | b = ((const uint32_t*) bus->rbuffer)[3]; | |
1067 | ||
1068 | e = ((const uint8_t*) bus->rbuffer)[0]; | |
0461f8cd | 1069 | if (e == BUS_LITTLE_ENDIAN) { |
a7e3212d LP |
1070 | a = le32toh(a); |
1071 | b = le32toh(b); | |
0461f8cd | 1072 | } else if (e == BUS_BIG_ENDIAN) { |
a7e3212d LP |
1073 | a = be32toh(a); |
1074 | b = be32toh(b); | |
1075 | } else | |
1076 | return -EBADMSG; | |
1077 | ||
1078 | sum = (uint64_t) sizeof(struct bus_header) + (uint64_t) ALIGN_TO(b, 8) + (uint64_t) a; | |
1079 | if (sum >= BUS_MESSAGE_SIZE_MAX) | |
1080 | return -ENOBUFS; | |
1081 | ||
1082 | *need = (size_t) sum; | |
1083 | return 0; | |
1084 | } | |
1085 | ||
7d22c717 | 1086 | static int bus_socket_make_message(sd_bus *bus, size_t size) { |
a7e3212d LP |
1087 | sd_bus_message *t; |
1088 | void *b; | |
1089 | int r; | |
1090 | ||
1091 | assert(bus); | |
a7e3212d | 1092 | assert(bus->rbuffer_size >= size); |
945c2931 | 1093 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 1094 | |
7adc46fc LP |
1095 | r = bus_rqueue_make_room(bus); |
1096 | if (r < 0) | |
1097 | return r; | |
1098 | ||
a7e3212d LP |
1099 | if (bus->rbuffer_size > size) { |
1100 | b = memdup((const uint8_t*) bus->rbuffer + size, | |
1101 | bus->rbuffer_size - size); | |
1102 | if (!b) | |
1103 | return -ENOMEM; | |
1104 | } else | |
1105 | b = NULL; | |
1106 | ||
df2d202e LP |
1107 | r = bus_message_from_malloc(bus, |
1108 | bus->rbuffer, size, | |
a7e3212d | 1109 | bus->fds, bus->n_fds, |
038f9863 | 1110 | NULL, |
a7e3212d LP |
1111 | &t); |
1112 | if (r < 0) { | |
1113 | free(b); | |
1114 | return r; | |
1115 | } | |
1116 | ||
1117 | bus->rbuffer = b; | |
1118 | bus->rbuffer_size -= size; | |
1119 | ||
1120 | bus->fds = NULL; | |
1121 | bus->n_fds = 0; | |
1122 | ||
7adc46fc | 1123 | bus->rqueue[bus->rqueue_size++] = t; |
7d22c717 | 1124 | |
a7e3212d LP |
1125 | return 1; |
1126 | } | |
1127 | ||
7d22c717 | 1128 | int bus_socket_read_message(sd_bus *bus) { |
a7e3212d | 1129 | struct msghdr mh; |
7f4e6a1c | 1130 | struct iovec iov = {}; |
a7e3212d LP |
1131 | ssize_t k; |
1132 | size_t need; | |
1133 | int r; | |
1134 | void *b; | |
1135 | union { | |
1136 | struct cmsghdr cmsghdr; | |
d868f2a3 | 1137 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
a7e3212d | 1138 | } control; |
4d3a5b10 | 1139 | bool handle_cmsg = false; |
a7e3212d LP |
1140 | |
1141 | assert(bus); | |
945c2931 | 1142 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1143 | |
1144 | r = bus_socket_read_message_need(bus, &need); | |
1145 | if (r < 0) | |
1146 | return r; | |
1147 | ||
1148 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1149 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1150 | |
1151 | b = realloc(bus->rbuffer, need); | |
1152 | if (!b) | |
1153 | return -ENOMEM; | |
1154 | ||
1155 | bus->rbuffer = b; | |
1156 | ||
a7e3212d LP |
1157 | iov.iov_base = (uint8_t*) bus->rbuffer + bus->rbuffer_size; |
1158 | iov.iov_len = need - bus->rbuffer_size; | |
1159 | ||
15d5af81 LP |
1160 | if (bus->prefer_readv) |
1161 | k = readv(bus->input_fd, &iov, 1); | |
1162 | else { | |
1163 | zero(mh); | |
1164 | mh.msg_iov = &iov; | |
1165 | mh.msg_iovlen = 1; | |
1166 | mh.msg_control = &control; | |
1167 | mh.msg_controllen = sizeof(control); | |
1168 | ||
1169 | k = recvmsg(bus->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); | |
1170 | if (k < 0 && errno == ENOTSOCK) { | |
1171 | bus->prefer_readv = true; | |
1172 | k = readv(bus->input_fd, &iov, 1); | |
1173 | } else | |
1174 | handle_cmsg = true; | |
1175 | } | |
a7e3212d LP |
1176 | if (k < 0) |
1177 | return errno == EAGAIN ? 0 : -errno; | |
1178 | if (k == 0) | |
1179 | return -ECONNRESET; | |
1180 | ||
1181 | bus->rbuffer_size += k; | |
1182 | ||
2a1288ff LP |
1183 | if (handle_cmsg) { |
1184 | struct cmsghdr *cmsg; | |
1185 | ||
1186 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
1187 | if (cmsg->cmsg_level == SOL_SOCKET && |
1188 | cmsg->cmsg_type == SCM_RIGHTS) { | |
7fe2903c | 1189 | int n, *f, i; |
15d5af81 LP |
1190 | |
1191 | n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
1192 | ||
1193 | if (!bus->can_fds) { | |
1194 | /* Whut? We received fds but this | |
1195 | * isn't actually enabled? Close them, | |
1196 | * and fail */ | |
1197 | ||
1198 | close_many((int*) CMSG_DATA(cmsg), n); | |
1199 | return -EIO; | |
1200 | } | |
1201 | ||
62d74c78 | 1202 | f = reallocarray(bus->fds, bus->n_fds + n, sizeof(int)); |
15d5af81 LP |
1203 | if (!f) { |
1204 | close_many((int*) CMSG_DATA(cmsg), n); | |
1205 | return -ENOMEM; | |
1206 | } | |
1207 | ||
7fe2903c LP |
1208 | for (i = 0; i < n; i++) |
1209 | f[bus->n_fds++] = fd_move_above_stdio(((int*) CMSG_DATA(cmsg))[i]); | |
15d5af81 | 1210 | bus->fds = f; |
d868f2a3 ZJS |
1211 | } else |
1212 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
1213 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 1214 | } |
a7e3212d LP |
1215 | |
1216 | r = bus_socket_read_message_need(bus, &need); | |
1217 | if (r < 0) | |
1218 | return r; | |
1219 | ||
1220 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1221 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1222 | |
1223 | return 1; | |
1224 | } | |
1225 | ||
1226 | int bus_socket_process_opening(sd_bus *b) { | |
1227 | int error = 0; | |
1228 | socklen_t slen = sizeof(error); | |
b92bea5d ZJS |
1229 | struct pollfd p = { |
1230 | .fd = b->output_fd, | |
1231 | .events = POLLOUT, | |
1232 | }; | |
a7e3212d LP |
1233 | int r; |
1234 | ||
a7e3212d LP |
1235 | assert(b->state == BUS_OPENING); |
1236 | ||
a7e3212d LP |
1237 | r = poll(&p, 1, 0); |
1238 | if (r < 0) | |
1239 | return -errno; | |
1240 | ||
1241 | if (!(p.revents & (POLLOUT|POLLERR|POLLHUP))) | |
1242 | return 0; | |
1243 | ||
e82c9509 | 1244 | r = getsockopt(b->output_fd, SOL_SOCKET, SO_ERROR, &error, &slen); |
a7e3212d LP |
1245 | if (r < 0) |
1246 | b->last_connect_error = errno; | |
1247 | else if (error != 0) | |
1248 | b->last_connect_error = error; | |
1249 | else if (p.revents & (POLLERR|POLLHUP)) | |
1250 | b->last_connect_error = ECONNREFUSED; | |
1251 | else | |
1252 | return bus_socket_start_auth(b); | |
1253 | ||
1254 | return bus_next_address(b); | |
1255 | } | |
1256 | ||
1257 | int bus_socket_process_authenticating(sd_bus *b) { | |
1258 | int r; | |
1259 | ||
1260 | assert(b); | |
1261 | assert(b->state == BUS_AUTHENTICATING); | |
1262 | ||
1263 | if (now(CLOCK_MONOTONIC) >= b->auth_timeout) | |
1264 | return -ETIMEDOUT; | |
1265 | ||
1266 | r = bus_socket_write_auth(b); | |
1267 | if (r != 0) | |
1268 | return r; | |
1269 | ||
1270 | return bus_socket_read_auth(b); | |
1271 | } | |
8a5cd31e LP |
1272 | |
1273 | int bus_socket_process_watch_bind(sd_bus *b) { | |
1274 | int r, q; | |
1275 | ||
1276 | assert(b); | |
1277 | assert(b->state == BUS_WATCH_BIND); | |
1278 | assert(b->inotify_fd >= 0); | |
1279 | ||
1280 | r = flush_fd(b->inotify_fd); | |
1281 | if (r <= 0) | |
1282 | return r; | |
1283 | ||
1284 | log_debug("Got inotify event on bus %s.", strna(b->description)); | |
1285 | ||
1286 | /* We flushed events out of the inotify fd. In that case, maybe the socket is valid now? Let's try to connect | |
1287 | * to it again */ | |
1288 | ||
1289 | r = bus_socket_connect(b); | |
1290 | if (r < 0) | |
1291 | return r; | |
1292 | ||
1293 | q = bus_attach_io_events(b); | |
1294 | if (q < 0) | |
1295 | return q; | |
1296 | ||
1297 | q = bus_attach_inotify_event(b); | |
1298 | if (q < 0) | |
1299 | return q; | |
1300 | ||
1301 | return r; | |
1302 | } |