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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
a7e3212d LP |
2 | |
3 | #include <endian.h> | |
07630cea | 4 | #include <poll.h> |
a7e3212d LP |
5 | #include <stdlib.h> |
6 | #include <unistd.h> | |
a7e3212d | 7 | |
07630cea | 8 | #include "sd-bus.h" |
24882e06 | 9 | #include "sd-daemon.h" |
07630cea | 10 | |
b5efdb8a | 11 | #include "alloc-util.h" |
07630cea LP |
12 | #include "bus-internal.h" |
13 | #include "bus-message.h" | |
3ffd4af2 LP |
14 | #include "bus-socket.h" |
15 | #include "fd-util.h" | |
f97b34a6 | 16 | #include "format-util.h" |
8a5cd31e | 17 | #include "fs-util.h" |
15a5e950 | 18 | #include "hexdecoct.h" |
8a5cd31e | 19 | #include "io-util.h" |
a7e3212d LP |
20 | #include "macro.h" |
21 | #include "missing.h" | |
8a5cd31e | 22 | #include "path-util.h" |
dccca82b | 23 | #include "process-util.h" |
595225af | 24 | #include "rlimit-util.h" |
7fc04b12 | 25 | #include "selinux-util.h" |
24882e06 | 26 | #include "signal-util.h" |
15a5e950 | 27 | #include "stdio-util.h" |
07630cea | 28 | #include "string-util.h" |
b1d4f8e1 | 29 | #include "user-util.h" |
07630cea LP |
30 | #include "utf8.h" |
31 | #include "util.h" | |
a7e3212d | 32 | |
aec6d91f LP |
33 | #define SNDBUF_SIZE (8*1024*1024) |
34 | ||
2181a7f5 | 35 | static void iovec_advance(struct iovec iov[], unsigned *idx, size_t size) { |
a7e3212d LP |
36 | |
37 | while (size > 0) { | |
38 | struct iovec *i = iov + *idx; | |
39 | ||
40 | if (i->iov_len > size) { | |
41 | i->iov_base = (uint8_t*) i->iov_base + size; | |
42 | i->iov_len -= size; | |
43 | return; | |
44 | } | |
45 | ||
46 | size -= i->iov_len; | |
47 | ||
5cfa2c3d | 48 | *i = IOVEC_MAKE(NULL, 0); |
a7e3212d | 49 | |
313cefa1 | 50 | (*idx)++; |
a7e3212d LP |
51 | } |
52 | } | |
53 | ||
bc7fd8cd | 54 | static int append_iovec(sd_bus_message *m, const void *p, size_t sz) { |
2100fa10 LP |
55 | assert(m); |
56 | assert(p); | |
57 | assert(sz > 0); | |
58 | ||
5cfa2c3d | 59 | m->iovec[m->n_iovec++] = IOVEC_MAKE((void*) p, sz); |
bc7fd8cd LP |
60 | |
61 | return 0; | |
2100fa10 LP |
62 | } |
63 | ||
bc7fd8cd LP |
64 | static int bus_message_setup_iovec(sd_bus_message *m) { |
65 | struct bus_body_part *part; | |
13c299d3 | 66 | unsigned n, i; |
bc7fd8cd LP |
67 | int r; |
68 | ||
2100fa10 LP |
69 | assert(m); |
70 | assert(m->sealed); | |
71 | ||
72 | if (m->n_iovec > 0) | |
bc7fd8cd LP |
73 | return 0; |
74 | ||
75 | assert(!m->iovec); | |
2100fa10 | 76 | |
c91cb83c | 77 | n = 1 + m->n_body_parts; |
bc7fd8cd LP |
78 | if (n < ELEMENTSOF(m->iovec_fixed)) |
79 | m->iovec = m->iovec_fixed; | |
80 | else { | |
81 | m->iovec = new(struct iovec, n); | |
66b26c5c LP |
82 | if (!m->iovec) { |
83 | r = -ENOMEM; | |
84 | goto fail; | |
85 | } | |
bc7fd8cd | 86 | } |
2100fa10 | 87 | |
c91cb83c | 88 | r = append_iovec(m, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
bc7fd8cd | 89 | if (r < 0) |
66b26c5c | 90 | goto fail; |
2100fa10 | 91 | |
9b29bb68 | 92 | MESSAGE_FOREACH_PART(part, i, m) { |
66b26c5c LP |
93 | r = bus_body_part_map(part); |
94 | if (r < 0) | |
95 | goto fail; | |
96 | ||
bc7fd8cd LP |
97 | r = append_iovec(m, part->data, part->size); |
98 | if (r < 0) | |
66b26c5c | 99 | goto fail; |
bc7fd8cd LP |
100 | } |
101 | ||
102 | assert(n == m->n_iovec); | |
103 | ||
104 | return 0; | |
66b26c5c LP |
105 | |
106 | fail: | |
107 | m->poisoned = true; | |
108 | return r; | |
2100fa10 LP |
109 | } |
110 | ||
2181a7f5 LP |
111 | bool bus_socket_auth_needs_write(sd_bus *b) { |
112 | ||
113 | unsigned i; | |
114 | ||
115 | if (b->auth_index >= ELEMENTSOF(b->auth_iovec)) | |
116 | return false; | |
117 | ||
118 | for (i = b->auth_index; i < ELEMENTSOF(b->auth_iovec); i++) { | |
119 | struct iovec *j = b->auth_iovec + i; | |
120 | ||
121 | if (j->iov_len > 0) | |
122 | return true; | |
123 | } | |
124 | ||
125 | return false; | |
126 | } | |
127 | ||
a7e3212d | 128 | static int bus_socket_write_auth(sd_bus *b) { |
a7e3212d LP |
129 | ssize_t k; |
130 | ||
131 | assert(b); | |
132 | assert(b->state == BUS_AUTHENTICATING); | |
133 | ||
2181a7f5 | 134 | if (!bus_socket_auth_needs_write(b)) |
a7e3212d LP |
135 | return 0; |
136 | ||
15d5af81 LP |
137 | if (b->prefer_writev) |
138 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
139 | else { | |
140 | struct msghdr mh; | |
141 | zero(mh); | |
142 | ||
143 | mh.msg_iov = b->auth_iovec + b->auth_index; | |
144 | mh.msg_iovlen = ELEMENTSOF(b->auth_iovec) - b->auth_index; | |
145 | ||
146 | k = sendmsg(b->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
147 | if (k < 0 && errno == ENOTSOCK) { | |
148 | b->prefer_writev = true; | |
149 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
150 | } | |
151 | } | |
a7e3212d | 152 | |
a7e3212d LP |
153 | if (k < 0) |
154 | return errno == EAGAIN ? 0 : -errno; | |
155 | ||
156 | iovec_advance(b->auth_iovec, &b->auth_index, (size_t) k); | |
a7e3212d LP |
157 | return 1; |
158 | } | |
159 | ||
2181a7f5 | 160 | static int bus_socket_auth_verify_client(sd_bus *b) { |
a7e3212d LP |
161 | char *e, *f, *start; |
162 | sd_id128_t peer; | |
163 | unsigned i; | |
164 | int r; | |
165 | ||
2181a7f5 LP |
166 | assert(b); |
167 | ||
a7e3212d LP |
168 | /* We expect two response lines: "OK" and possibly |
169 | * "AGREE_UNIX_FD" */ | |
170 | ||
6e6c21c8 | 171 | e = memmem_safe(b->rbuffer, b->rbuffer_size, "\r\n", 2); |
a7e3212d LP |
172 | if (!e) |
173 | return 0; | |
174 | ||
c7db1984 | 175 | if (b->accept_fd) { |
a7e3212d LP |
176 | f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2); |
177 | if (!f) | |
178 | return 0; | |
179 | ||
180 | start = f + 2; | |
181 | } else { | |
182 | f = NULL; | |
183 | start = e + 2; | |
184 | } | |
185 | ||
186 | /* Nice! We got all the lines we need. First check the OK | |
187 | * line */ | |
188 | ||
189 | if (e - (char*) b->rbuffer != 3 + 32) | |
190 | return -EPERM; | |
191 | ||
192 | if (memcmp(b->rbuffer, "OK ", 3)) | |
193 | return -EPERM; | |
194 | ||
2181a7f5 LP |
195 | b->auth = b->anonymous_auth ? BUS_AUTH_ANONYMOUS : BUS_AUTH_EXTERNAL; |
196 | ||
a7e3212d LP |
197 | for (i = 0; i < 32; i += 2) { |
198 | int x, y; | |
199 | ||
200 | x = unhexchar(((char*) b->rbuffer)[3 + i]); | |
201 | y = unhexchar(((char*) b->rbuffer)[3 + i + 1]); | |
202 | ||
203 | if (x < 0 || y < 0) | |
204 | return -EINVAL; | |
205 | ||
206 | peer.bytes[i/2] = ((uint8_t) x << 4 | (uint8_t) y); | |
207 | } | |
208 | ||
3bbaff3e | 209 | if (!sd_id128_is_null(b->server_id) && |
98178d39 | 210 | !sd_id128_equal(b->server_id, peer)) |
a7e3212d LP |
211 | return -EPERM; |
212 | ||
98178d39 | 213 | b->server_id = peer; |
a7e3212d LP |
214 | |
215 | /* And possibly check the second line, too */ | |
216 | ||
217 | if (f) | |
218 | b->can_fds = | |
fbd0b64f LP |
219 | (f - e == STRLEN("\r\nAGREE_UNIX_FD")) && |
220 | memcmp(e + 2, "AGREE_UNIX_FD", | |
221 | STRLEN("AGREE_UNIX_FD")) == 0; | |
a7e3212d LP |
222 | |
223 | b->rbuffer_size -= (start - (char*) b->rbuffer); | |
224 | memmove(b->rbuffer, start, b->rbuffer_size); | |
225 | ||
226 | r = bus_start_running(b); | |
227 | if (r < 0) | |
228 | return r; | |
229 | ||
230 | return 1; | |
231 | } | |
232 | ||
2181a7f5 LP |
233 | static bool line_equals(const char *s, size_t m, const char *line) { |
234 | size_t l; | |
235 | ||
236 | l = strlen(line); | |
237 | if (l != m) | |
238 | return false; | |
239 | ||
240 | return memcmp(s, line, l) == 0; | |
241 | } | |
242 | ||
243 | static bool line_begins(const char *s, size_t m, const char *word) { | |
d27b725a | 244 | const char *p; |
2181a7f5 | 245 | |
d27b725a | 246 | p = memory_startswith(s, m, word); |
3f10c662 | 247 | return p && (p == (s + m) || *p == ' '); |
2181a7f5 LP |
248 | } |
249 | ||
250 | static int verify_anonymous_token(sd_bus *b, const char *p, size_t l) { | |
251 | _cleanup_free_ char *token = NULL; | |
30494563 TG |
252 | size_t len; |
253 | int r; | |
2181a7f5 LP |
254 | |
255 | if (!b->anonymous_auth) | |
256 | return 0; | |
257 | ||
258 | if (l <= 0) | |
259 | return 1; | |
260 | ||
261 | assert(p[0] == ' '); | |
262 | p++; l--; | |
263 | ||
264 | if (l % 2 != 0) | |
265 | return 0; | |
2181a7f5 | 266 | |
30494563 TG |
267 | r = unhexmem(p, l, (void **) &token, &len); |
268 | if (r < 0) | |
269 | return 0; | |
270 | ||
271 | if (memchr(token, 0, len)) | |
2181a7f5 LP |
272 | return 0; |
273 | ||
274 | return !!utf8_is_valid(token); | |
275 | } | |
276 | ||
277 | static int verify_external_token(sd_bus *b, const char *p, size_t l) { | |
278 | _cleanup_free_ char *token = NULL; | |
30494563 | 279 | size_t len; |
2181a7f5 LP |
280 | uid_t u; |
281 | int r; | |
282 | ||
283 | /* We don't do any real authentication here. Instead, we if | |
284 | * the owner of this bus wanted authentication he should have | |
285 | * checked SO_PEERCRED before even creating the bus object. */ | |
286 | ||
8411d2a2 | 287 | if (!b->anonymous_auth && !b->ucred_valid) |
2181a7f5 LP |
288 | return 0; |
289 | ||
290 | if (l <= 0) | |
291 | return 1; | |
292 | ||
293 | assert(p[0] == ' '); | |
294 | p++; l--; | |
295 | ||
296 | if (l % 2 != 0) | |
297 | return 0; | |
298 | ||
30494563 TG |
299 | r = unhexmem(p, l, (void**) &token, &len); |
300 | if (r < 0) | |
301 | return 0; | |
2181a7f5 | 302 | |
30494563 | 303 | if (memchr(token, 0, len)) |
2181a7f5 LP |
304 | return 0; |
305 | ||
306 | r = parse_uid(token, &u); | |
307 | if (r < 0) | |
308 | return 0; | |
309 | ||
8411d2a2 LP |
310 | /* We ignore the passed value if anonymous authentication is |
311 | * on anyway. */ | |
312 | if (!b->anonymous_auth && u != b->ucred.uid) | |
2181a7f5 LP |
313 | return 0; |
314 | ||
315 | return 1; | |
316 | } | |
317 | ||
318 | static int bus_socket_auth_write(sd_bus *b, const char *t) { | |
319 | char *p; | |
320 | size_t l; | |
321 | ||
322 | assert(b); | |
323 | assert(t); | |
324 | ||
325 | /* We only make use of the first iovec */ | |
945c2931 | 326 | assert(IN_SET(b->auth_index, 0, 1)); |
2181a7f5 LP |
327 | |
328 | l = strlen(t); | |
329 | p = malloc(b->auth_iovec[0].iov_len + l); | |
330 | if (!p) | |
331 | return -ENOMEM; | |
332 | ||
75f32f04 | 333 | memcpy_safe(p, b->auth_iovec[0].iov_base, b->auth_iovec[0].iov_len); |
2181a7f5 LP |
334 | memcpy(p + b->auth_iovec[0].iov_len, t, l); |
335 | ||
336 | b->auth_iovec[0].iov_base = p; | |
337 | b->auth_iovec[0].iov_len += l; | |
338 | ||
339 | free(b->auth_buffer); | |
340 | b->auth_buffer = p; | |
341 | b->auth_index = 0; | |
342 | return 0; | |
343 | } | |
344 | ||
345 | static int bus_socket_auth_write_ok(sd_bus *b) { | |
346 | char t[3 + 32 + 2 + 1]; | |
347 | ||
348 | assert(b); | |
349 | ||
5ffa8c81 | 350 | xsprintf(t, "OK " SD_ID128_FORMAT_STR "\r\n", SD_ID128_FORMAT_VAL(b->server_id)); |
2181a7f5 LP |
351 | |
352 | return bus_socket_auth_write(b, t); | |
353 | } | |
354 | ||
355 | static int bus_socket_auth_verify_server(sd_bus *b) { | |
356 | char *e; | |
357 | const char *line; | |
358 | size_t l; | |
359 | bool processed = false; | |
360 | int r; | |
361 | ||
362 | assert(b); | |
363 | ||
2b4ac889 | 364 | if (b->rbuffer_size < 1) |
2181a7f5 LP |
365 | return 0; |
366 | ||
367 | /* First char must be a NUL byte */ | |
368 | if (*(char*) b->rbuffer != 0) | |
369 | return -EIO; | |
370 | ||
2b4ac889 LP |
371 | if (b->rbuffer_size < 3) |
372 | return 0; | |
373 | ||
2181a7f5 LP |
374 | /* Begin with the first line */ |
375 | if (b->auth_rbegin <= 0) | |
376 | b->auth_rbegin = 1; | |
377 | ||
378 | for (;;) { | |
379 | /* Check if line is complete */ | |
380 | line = (char*) b->rbuffer + b->auth_rbegin; | |
381 | e = memmem(line, b->rbuffer_size - b->auth_rbegin, "\r\n", 2); | |
382 | if (!e) | |
383 | return processed; | |
384 | ||
385 | l = e - line; | |
386 | ||
387 | if (line_begins(line, l, "AUTH ANONYMOUS")) { | |
388 | ||
389 | r = verify_anonymous_token(b, line + 14, l - 14); | |
390 | if (r < 0) | |
391 | return r; | |
392 | if (r == 0) | |
393 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
394 | else { | |
395 | b->auth = BUS_AUTH_ANONYMOUS; | |
396 | r = bus_socket_auth_write_ok(b); | |
397 | } | |
398 | ||
399 | } else if (line_begins(line, l, "AUTH EXTERNAL")) { | |
400 | ||
401 | r = verify_external_token(b, line + 13, l - 13); | |
402 | if (r < 0) | |
403 | return r; | |
404 | if (r == 0) | |
405 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
406 | else { | |
407 | b->auth = BUS_AUTH_EXTERNAL; | |
408 | r = bus_socket_auth_write_ok(b); | |
409 | } | |
410 | ||
411 | } else if (line_begins(line, l, "AUTH")) | |
412 | r = bus_socket_auth_write(b, "REJECTED EXTERNAL ANONYMOUS\r\n"); | |
413 | else if (line_equals(line, l, "CANCEL") || | |
414 | line_begins(line, l, "ERROR")) { | |
415 | ||
416 | b->auth = _BUS_AUTH_INVALID; | |
417 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
418 | ||
419 | } else if (line_equals(line, l, "BEGIN")) { | |
420 | ||
421 | if (b->auth == _BUS_AUTH_INVALID) | |
422 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
423 | else { | |
424 | /* We can't leave from the auth phase | |
425 | * before we haven't written | |
426 | * everything queued, so let's check | |
427 | * that */ | |
428 | ||
429 | if (bus_socket_auth_needs_write(b)) | |
430 | return 1; | |
431 | ||
432 | b->rbuffer_size -= (e + 2 - (char*) b->rbuffer); | |
433 | memmove(b->rbuffer, e + 2, b->rbuffer_size); | |
434 | return bus_start_running(b); | |
435 | } | |
436 | ||
437 | } else if (line_begins(line, l, "DATA")) { | |
438 | ||
439 | if (b->auth == _BUS_AUTH_INVALID) | |
440 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
441 | else { | |
442 | if (b->auth == BUS_AUTH_ANONYMOUS) | |
443 | r = verify_anonymous_token(b, line + 4, l - 4); | |
444 | else | |
445 | r = verify_external_token(b, line + 4, l - 4); | |
446 | ||
447 | if (r < 0) | |
448 | return r; | |
449 | if (r == 0) { | |
450 | b->auth = _BUS_AUTH_INVALID; | |
451 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
452 | } else | |
453 | r = bus_socket_auth_write_ok(b); | |
454 | } | |
455 | } else if (line_equals(line, l, "NEGOTIATE_UNIX_FD")) { | |
c7db1984 | 456 | if (b->auth == _BUS_AUTH_INVALID || !b->accept_fd) |
2181a7f5 LP |
457 | r = bus_socket_auth_write(b, "ERROR\r\n"); |
458 | else { | |
459 | b->can_fds = true; | |
460 | r = bus_socket_auth_write(b, "AGREE_UNIX_FD\r\n"); | |
461 | } | |
462 | } else | |
463 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
464 | ||
465 | if (r < 0) | |
466 | return r; | |
467 | ||
468 | b->auth_rbegin = e + 2 - (char*) b->rbuffer; | |
469 | ||
470 | processed = true; | |
471 | } | |
472 | } | |
473 | ||
474 | static int bus_socket_auth_verify(sd_bus *b) { | |
475 | assert(b); | |
476 | ||
477 | if (b->is_server) | |
478 | return bus_socket_auth_verify_server(b); | |
479 | else | |
480 | return bus_socket_auth_verify_client(b); | |
481 | } | |
482 | ||
a7e3212d LP |
483 | static int bus_socket_read_auth(sd_bus *b) { |
484 | struct msghdr mh; | |
7f4e6a1c | 485 | struct iovec iov = {}; |
a7e3212d LP |
486 | size_t n; |
487 | ssize_t k; | |
488 | int r; | |
489 | void *p; | |
2181a7f5 LP |
490 | union { |
491 | struct cmsghdr cmsghdr; | |
d868f2a3 | 492 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
2181a7f5 | 493 | } control; |
15d5af81 | 494 | bool handle_cmsg = false; |
a7e3212d LP |
495 | |
496 | assert(b); | |
2181a7f5 | 497 | assert(b->state == BUS_AUTHENTICATING); |
a7e3212d LP |
498 | |
499 | r = bus_socket_auth_verify(b); | |
500 | if (r != 0) | |
501 | return r; | |
502 | ||
9607d947 | 503 | n = MAX(256u, b->rbuffer_size * 2); |
a7e3212d LP |
504 | |
505 | if (n > BUS_AUTH_SIZE_MAX) | |
506 | n = BUS_AUTH_SIZE_MAX; | |
507 | ||
508 | if (b->rbuffer_size >= n) | |
509 | return -ENOBUFS; | |
510 | ||
511 | p = realloc(b->rbuffer, n); | |
512 | if (!p) | |
513 | return -ENOMEM; | |
514 | ||
515 | b->rbuffer = p; | |
516 | ||
5cfa2c3d | 517 | iov = IOVEC_MAKE((uint8_t *)b->rbuffer + b->rbuffer_size, n - b->rbuffer_size); |
a7e3212d | 518 | |
15d5af81 LP |
519 | if (b->prefer_readv) |
520 | k = readv(b->input_fd, &iov, 1); | |
521 | else { | |
522 | zero(mh); | |
523 | mh.msg_iov = &iov; | |
524 | mh.msg_iovlen = 1; | |
525 | mh.msg_control = &control; | |
526 | mh.msg_controllen = sizeof(control); | |
527 | ||
a6887cc0 | 528 | k = recvmsg(b->input_fd, &mh, MSG_DONTWAIT|MSG_CMSG_CLOEXEC); |
15d5af81 LP |
529 | if (k < 0 && errno == ENOTSOCK) { |
530 | b->prefer_readv = true; | |
531 | k = readv(b->input_fd, &iov, 1); | |
532 | } else | |
533 | handle_cmsg = true; | |
534 | } | |
a7e3212d LP |
535 | if (k < 0) |
536 | return errno == EAGAIN ? 0 : -errno; | |
537 | if (k == 0) | |
538 | return -ECONNRESET; | |
539 | ||
540 | b->rbuffer_size += k; | |
541 | ||
2a1288ff LP |
542 | if (handle_cmsg) { |
543 | struct cmsghdr *cmsg; | |
544 | ||
545 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
546 | if (cmsg->cmsg_level == SOL_SOCKET && |
547 | cmsg->cmsg_type == SCM_RIGHTS) { | |
548 | int j; | |
549 | ||
550 | /* Whut? We received fds during the auth | |
551 | * protocol? Somebody is playing games with | |
552 | * us. Close them all, and fail */ | |
553 | j = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
554 | close_many((int*) CMSG_DATA(cmsg), j); | |
555 | return -EIO; | |
d868f2a3 ZJS |
556 | } else |
557 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
558 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 559 | } |
2181a7f5 | 560 | |
a7e3212d LP |
561 | r = bus_socket_auth_verify(b); |
562 | if (r != 0) | |
563 | return r; | |
564 | ||
565 | return 1; | |
566 | } | |
567 | ||
8f04d2eb | 568 | void bus_socket_setup(sd_bus *b) { |
a7e3212d LP |
569 | assert(b); |
570 | ||
aec6d91f | 571 | /* Increase the buffers to 8 MB */ |
6ae22ffb LP |
572 | (void) fd_inc_rcvbuf(b->input_fd, SNDBUF_SIZE); |
573 | (void) fd_inc_sndbuf(b->output_fd, SNDBUF_SIZE); | |
a7e3212d | 574 | |
e1d337d4 | 575 | b->message_version = 1; |
0f437184 | 576 | b->message_endian = 0; |
8f04d2eb | 577 | } |
e1d337d4 | 578 | |
8f04d2eb | 579 | static void bus_get_peercred(sd_bus *b) { |
c4e6556c ZJS |
580 | int r; |
581 | ||
8f04d2eb | 582 | assert(b); |
18ac4643 LP |
583 | assert(!b->ucred_valid); |
584 | assert(!b->label); | |
585 | assert(b->n_groups == (size_t) -1); | |
8f04d2eb LP |
586 | |
587 | /* Get the peer for socketpair() sockets */ | |
eff05270 | 588 | b->ucred_valid = getpeercred(b->input_fd, &b->ucred) >= 0; |
c4e6556c ZJS |
589 | |
590 | /* Get the SELinux context of the peer */ | |
db7d1dca | 591 | r = getpeersec(b->input_fd, &b->label); |
18ac4643 | 592 | if (r < 0 && !IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) |
db7d1dca | 593 | log_debug_errno(r, "Failed to determine peer security context: %m"); |
18ac4643 LP |
594 | |
595 | /* Get the list of auxiliary groups of the peer */ | |
596 | r = getpeergroups(b->input_fd, &b->groups); | |
c599b325 | 597 | if (r >= 0) |
18ac4643 | 598 | b->n_groups = (size_t) r; |
c599b325 ZJS |
599 | else if (!IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) |
600 | log_debug_errno(r, "Failed to determine peer's group list: %m"); | |
a7e3212d LP |
601 | } |
602 | ||
2181a7f5 | 603 | static int bus_socket_start_auth_client(sd_bus *b) { |
a7e3212d | 604 | size_t l; |
2181a7f5 | 605 | const char *auth_suffix, *auth_prefix; |
a7e3212d LP |
606 | |
607 | assert(b); | |
608 | ||
2181a7f5 LP |
609 | if (b->anonymous_auth) { |
610 | auth_prefix = "\0AUTH ANONYMOUS "; | |
a7e3212d | 611 | |
2181a7f5 LP |
612 | /* For ANONYMOUS auth we send some arbitrary "trace" string */ |
613 | l = 9; | |
614 | b->auth_buffer = hexmem("anonymous", l); | |
615 | } else { | |
5ffa8c81 | 616 | char text[DECIMAL_STR_MAX(uid_t) + 1]; |
a7e3212d | 617 | |
2181a7f5 | 618 | auth_prefix = "\0AUTH EXTERNAL "; |
a7e3212d | 619 | |
5ffa8c81 | 620 | xsprintf(text, UID_FMT, geteuid()); |
a7e3212d | 621 | |
2181a7f5 LP |
622 | l = strlen(text); |
623 | b->auth_buffer = hexmem(text, l); | |
624 | } | |
625 | ||
626 | if (!b->auth_buffer) | |
a7e3212d LP |
627 | return -ENOMEM; |
628 | ||
c7db1984 | 629 | if (b->accept_fd) |
2181a7f5 LP |
630 | auth_suffix = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n"; |
631 | else | |
632 | auth_suffix = "\r\nBEGIN\r\n"; | |
a7e3212d | 633 | |
5cfa2c3d LP |
634 | b->auth_iovec[0] = IOVEC_MAKE((void*) auth_prefix, 1 + strlen(auth_prefix + 1)); |
635 | b->auth_iovec[1] = IOVEC_MAKE(b->auth_buffer, l * 2); | |
636 | b->auth_iovec[2] = IOVEC_MAKE_STRING(auth_suffix); | |
a7e3212d LP |
637 | |
638 | return bus_socket_write_auth(b); | |
639 | } | |
640 | ||
a7893c6b | 641 | int bus_socket_start_auth(sd_bus *b) { |
2181a7f5 LP |
642 | assert(b); |
643 | ||
8f04d2eb LP |
644 | bus_get_peercred(b); |
645 | ||
3e0e196e | 646 | bus_set_state(b, BUS_AUTHENTICATING); |
036d61b3 | 647 | b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_AUTH_TIMEOUT; |
2181a7f5 | 648 | |
9ab32f9d | 649 | if (sd_is_socket(b->input_fd, AF_UNIX, 0, 0) <= 0) |
c7db1984 | 650 | b->accept_fd = false; |
2181a7f5 | 651 | |
9ab32f9d LP |
652 | if (b->output_fd != b->input_fd) |
653 | if (sd_is_socket(b->output_fd, AF_UNIX, 0, 0) <= 0) | |
c7db1984 | 654 | b->accept_fd = false; |
e82c9509 | 655 | |
2181a7f5 LP |
656 | if (b->is_server) |
657 | return bus_socket_read_auth(b); | |
658 | else | |
659 | return bus_socket_start_auth_client(b); | |
660 | } | |
661 | ||
8a5cd31e LP |
662 | static int bus_socket_inotify_setup(sd_bus *b) { |
663 | _cleanup_free_ int *new_watches = NULL; | |
664 | _cleanup_free_ char *absolute = NULL; | |
665 | size_t n_allocated = 0, n = 0, done = 0, i; | |
666 | unsigned max_follow = 32; | |
667 | const char *p; | |
668 | int wd, r; | |
669 | ||
670 | assert(b); | |
671 | assert(b->watch_bind); | |
672 | assert(b->sockaddr.sa.sa_family == AF_UNIX); | |
673 | assert(b->sockaddr.un.sun_path[0] != 0); | |
674 | ||
675 | /* Sets up an inotify fd in case watch_bind is enabled: wait until the configured AF_UNIX file system socket | |
676 | * appears before connecting to it. The implemented is pretty simplistic: we just subscribe to relevant changes | |
677 | * to all prefix components of the path, and every time we get an event for that we try to reconnect again, | |
678 | * without actually caring what precisely the event we got told us. If we still can't connect we re-subscribe | |
679 | * to all relevant changes of anything in the path, so that our watches include any possibly newly created path | |
680 | * components. */ | |
681 | ||
682 | if (b->inotify_fd < 0) { | |
683 | b->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
684 | if (b->inotify_fd < 0) | |
685 | return -errno; | |
7fe2903c LP |
686 | |
687 | b->inotify_fd = fd_move_above_stdio(b->inotify_fd); | |
8a5cd31e LP |
688 | } |
689 | ||
690 | /* Make sure the path is NUL terminated */ | |
691 | p = strndupa(b->sockaddr.un.sun_path, sizeof(b->sockaddr.un.sun_path)); | |
692 | ||
693 | /* Make sure the path is absolute */ | |
694 | r = path_make_absolute_cwd(p, &absolute); | |
695 | if (r < 0) | |
696 | goto fail; | |
697 | ||
698 | /* Watch all parent directories, and don't mind any prefix that doesn't exist yet. For the innermost directory | |
699 | * that exists we want to know when files are created or moved into it. For all parents of it we just care if | |
700 | * they are removed or renamed. */ | |
701 | ||
702 | if (!GREEDY_REALLOC(new_watches, n_allocated, n + 1)) { | |
703 | r = -ENOMEM; | |
704 | goto fail; | |
705 | } | |
706 | ||
707 | /* Start with the top-level directory, which is a bit simpler than the rest, since it can't be a symlink, and | |
708 | * always exists */ | |
709 | wd = inotify_add_watch(b->inotify_fd, "/", IN_CREATE|IN_MOVED_TO); | |
710 | if (wd < 0) { | |
711 | r = log_debug_errno(errno, "Failed to add inotify watch on /: %m"); | |
712 | goto fail; | |
713 | } else | |
714 | new_watches[n++] = wd; | |
715 | ||
716 | for (;;) { | |
717 | _cleanup_free_ char *component = NULL, *prefix = NULL, *destination = NULL; | |
718 | size_t n_slashes, n_component; | |
719 | char *c = NULL; | |
720 | ||
721 | n_slashes = strspn(absolute + done, "/"); | |
722 | n_component = n_slashes + strcspn(absolute + done + n_slashes, "/"); | |
723 | ||
724 | if (n_component == 0) /* The end */ | |
725 | break; | |
726 | ||
727 | component = strndup(absolute + done, n_component); | |
728 | if (!component) { | |
729 | r = -ENOMEM; | |
730 | goto fail; | |
731 | } | |
732 | ||
733 | /* A trailing slash? That's a directory, and not a socket then */ | |
734 | if (path_equal(component, "/")) { | |
735 | r = -EISDIR; | |
736 | goto fail; | |
737 | } | |
738 | ||
739 | /* A single dot? Let's eat this up */ | |
740 | if (path_equal(component, "/.")) { | |
741 | done += n_component; | |
742 | continue; | |
743 | } | |
744 | ||
745 | prefix = strndup(absolute, done + n_component); | |
746 | if (!prefix) { | |
747 | r = -ENOMEM; | |
748 | goto fail; | |
749 | } | |
750 | ||
751 | if (!GREEDY_REALLOC(new_watches, n_allocated, n + 1)) { | |
752 | r = -ENOMEM; | |
753 | goto fail; | |
754 | } | |
755 | ||
756 | wd = inotify_add_watch(b->inotify_fd, prefix, IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO|IN_DONT_FOLLOW); | |
757 | log_debug("Added inotify watch for %s on bus %s: %i", prefix, strna(b->description), wd); | |
758 | ||
759 | if (wd < 0) { | |
760 | if (IN_SET(errno, ENOENT, ELOOP)) | |
761 | break; /* This component doesn't exist yet, or the path contains a cyclic symlink right now */ | |
762 | ||
945403e6 | 763 | r = log_debug_errno(errno, "Failed to add inotify watch on %s: %m", empty_to_root(prefix)); |
8a5cd31e LP |
764 | goto fail; |
765 | } else | |
766 | new_watches[n++] = wd; | |
767 | ||
768 | /* Check if this is possibly a symlink. If so, let's follow it and watch it too. */ | |
769 | r = readlink_malloc(prefix, &destination); | |
770 | if (r == -EINVAL) { /* not a symlink */ | |
771 | done += n_component; | |
772 | continue; | |
773 | } | |
774 | if (r < 0) | |
775 | goto fail; | |
776 | ||
777 | if (isempty(destination)) { /* Empty symlink target? Yuck! */ | |
778 | r = -EINVAL; | |
779 | goto fail; | |
780 | } | |
781 | ||
782 | if (max_follow <= 0) { /* Let's make sure we don't follow symlinks forever */ | |
783 | r = -ELOOP; | |
784 | goto fail; | |
785 | } | |
786 | ||
787 | if (path_is_absolute(destination)) { | |
788 | /* For absolute symlinks we build the new path and start anew */ | |
789 | c = strjoin(destination, absolute + done + n_component); | |
790 | done = 0; | |
791 | } else { | |
792 | _cleanup_free_ char *t = NULL; | |
793 | ||
794 | /* For relative symlinks we replace the last component, and try again */ | |
795 | t = strndup(absolute, done); | |
796 | if (!t) | |
797 | return -ENOMEM; | |
798 | ||
799 | c = strjoin(t, "/", destination, absolute + done + n_component); | |
800 | } | |
801 | if (!c) { | |
802 | r = -ENOMEM; | |
803 | goto fail; | |
804 | } | |
805 | ||
806 | free(absolute); | |
807 | absolute = c; | |
808 | ||
809 | max_follow--; | |
810 | } | |
811 | ||
812 | /* And now, let's remove all watches from the previous iteration we don't need anymore */ | |
813 | for (i = 0; i < b->n_inotify_watches; i++) { | |
814 | bool found = false; | |
815 | size_t j; | |
816 | ||
817 | for (j = 0; j < n; j++) | |
818 | if (new_watches[j] == b->inotify_watches[i]) { | |
819 | found = true; | |
820 | break; | |
821 | } | |
822 | ||
823 | if (found) | |
824 | continue; | |
825 | ||
826 | (void) inotify_rm_watch(b->inotify_fd, b->inotify_watches[i]); | |
827 | } | |
828 | ||
829 | free_and_replace(b->inotify_watches, new_watches); | |
830 | b->n_inotify_watches = n; | |
831 | ||
832 | return 0; | |
833 | ||
834 | fail: | |
835 | bus_close_inotify_fd(b); | |
836 | return r; | |
837 | } | |
838 | ||
a7e3212d | 839 | int bus_socket_connect(sd_bus *b) { |
8a5cd31e | 840 | bool inotify_done = false; |
a7e3212d LP |
841 | int r; |
842 | ||
843 | assert(b); | |
a7e3212d | 844 | |
8a5cd31e LP |
845 | for (;;) { |
846 | assert(b->input_fd < 0); | |
847 | assert(b->output_fd < 0); | |
848 | assert(b->sockaddr.sa.sa_family != AF_UNSPEC); | |
a7e3212d | 849 | |
8a5cd31e LP |
850 | b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
851 | if (b->input_fd < 0) | |
852 | return -errno; | |
e82c9509 | 853 | |
7fe2903c LP |
854 | b->input_fd = fd_move_above_stdio(b->input_fd); |
855 | ||
8a5cd31e LP |
856 | b->output_fd = b->input_fd; |
857 | bus_socket_setup(b); | |
a7e3212d | 858 | |
8a5cd31e LP |
859 | if (connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size) < 0) { |
860 | if (errno == EINPROGRESS) { | |
a7e3212d | 861 | |
8a5cd31e LP |
862 | /* If we have any inotify watches open, close them now, we don't need them anymore, as |
863 | * we have successfully initiated a connection */ | |
864 | bus_close_inotify_fd(b); | |
865 | ||
866 | /* Note that very likely we are already in BUS_OPENING state here, as we enter it when | |
867 | * we start parsing the address string. The only reason we set the state explicitly | |
868 | * here, is to undo BUS_WATCH_BIND, in case we did the inotify magic. */ | |
3e0e196e | 869 | bus_set_state(b, BUS_OPENING); |
8a5cd31e LP |
870 | return 1; |
871 | } | |
872 | ||
873 | if (IN_SET(errno, ENOENT, ECONNREFUSED) && /* ENOENT → unix socket doesn't exist at all; ECONNREFUSED → unix socket stale */ | |
874 | b->watch_bind && | |
875 | b->sockaddr.sa.sa_family == AF_UNIX && | |
876 | b->sockaddr.un.sun_path[0] != 0) { | |
877 | ||
878 | /* This connection attempt failed, let's release the socket for now, and start with a | |
879 | * fresh one when reconnecting. */ | |
880 | bus_close_io_fds(b); | |
881 | ||
882 | if (inotify_done) { | |
883 | /* inotify set up already, don't do it again, just return now, and remember | |
884 | * that we are waiting for inotify events now. */ | |
3e0e196e | 885 | bus_set_state(b, BUS_WATCH_BIND); |
8a5cd31e LP |
886 | return 1; |
887 | } | |
888 | ||
889 | /* This is a file system socket, and the inotify logic is enabled. Let's create the necessary inotify fd. */ | |
890 | r = bus_socket_inotify_setup(b); | |
891 | if (r < 0) | |
892 | return r; | |
893 | ||
894 | /* Let's now try to connect a second time, because in theory there's otherwise a race | |
895 | * here: the socket might have been created in the time between our first connect() and | |
896 | * the time we set up the inotify logic. But let's remember that we set up inotify now, | |
897 | * so that we don't do the connect() more than twice. */ | |
898 | inotify_done = true; | |
899 | ||
900 | } else | |
901 | return -errno; | |
902 | } else | |
903 | break; | |
a7e3212d LP |
904 | } |
905 | ||
8a5cd31e LP |
906 | /* Yay, established, we don't need no inotify anymore! */ |
907 | bus_close_inotify_fd(b); | |
908 | ||
a7e3212d LP |
909 | return bus_socket_start_auth(b); |
910 | } | |
911 | ||
912 | int bus_socket_exec(sd_bus *b) { | |
e82c9509 | 913 | int s[2], r; |
a7e3212d LP |
914 | |
915 | assert(b); | |
e82c9509 LP |
916 | assert(b->input_fd < 0); |
917 | assert(b->output_fd < 0); | |
a7e3212d | 918 | assert(b->exec_path); |
392cf1d0 | 919 | assert(b->busexec_pid == 0); |
a7e3212d | 920 | |
e82c9509 LP |
921 | r = socketpair(AF_UNIX, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, s); |
922 | if (r < 0) | |
a7e3212d LP |
923 | return -errno; |
924 | ||
392cf1d0 | 925 | r = safe_fork_full("(sd-busexec)", s+1, 1, FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS, &b->busexec_pid); |
4c253ed1 | 926 | if (r < 0) { |
3d94f76c | 927 | safe_close_pair(s); |
4c253ed1 | 928 | return r; |
a7e3212d | 929 | } |
4c253ed1 | 930 | if (r == 0) { |
a7e3212d LP |
931 | /* Child */ |
932 | ||
2b33ab09 LP |
933 | if (rearrange_stdio(s[1], s[1], STDERR_FILENO) < 0) |
934 | _exit(EXIT_FAILURE); | |
a7e3212d | 935 | |
595225af LP |
936 | (void) rlimit_nofile_safe(); |
937 | ||
a7e3212d LP |
938 | if (b->exec_argv) |
939 | execvp(b->exec_path, b->exec_argv); | |
940 | else { | |
941 | const char *argv[] = { b->exec_path, NULL }; | |
942 | execvp(b->exec_path, (char**) argv); | |
943 | } | |
944 | ||
945 | _exit(EXIT_FAILURE); | |
946 | } | |
947 | ||
03e334a1 | 948 | safe_close(s[1]); |
7fe2903c | 949 | b->output_fd = b->input_fd = fd_move_above_stdio(s[0]); |
a7e3212d | 950 | |
8f04d2eb | 951 | bus_socket_setup(b); |
e1d337d4 | 952 | |
a7e3212d LP |
953 | return bus_socket_start_auth(b); |
954 | } | |
955 | ||
956 | int bus_socket_take_fd(sd_bus *b) { | |
a7e3212d LP |
957 | assert(b); |
958 | ||
8f04d2eb | 959 | bus_socket_setup(b); |
a7e3212d LP |
960 | |
961 | return bus_socket_start_auth(b); | |
962 | } | |
963 | ||
964 | int bus_socket_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) { | |
a7e3212d LP |
965 | struct iovec *iov; |
966 | ssize_t k; | |
967 | size_t n; | |
968 | unsigned j; | |
bc7fd8cd | 969 | int r; |
a7e3212d LP |
970 | |
971 | assert(bus); | |
972 | assert(m); | |
973 | assert(idx); | |
945c2931 | 974 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 975 | |
6629161f | 976 | if (*idx >= BUS_MESSAGE_SIZE(m)) |
a7e3212d | 977 | return 0; |
a7e3212d | 978 | |
bc7fd8cd LP |
979 | r = bus_message_setup_iovec(m); |
980 | if (r < 0) | |
981 | return r; | |
2100fa10 | 982 | |
a7e3212d LP |
983 | n = m->n_iovec * sizeof(struct iovec); |
984 | iov = alloca(n); | |
75f32f04 | 985 | memcpy_safe(iov, m->iovec, n); |
a7e3212d LP |
986 | |
987 | j = 0; | |
988 | iovec_advance(iov, &j, *idx); | |
989 | ||
15d5af81 LP |
990 | if (bus->prefer_writev) |
991 | k = writev(bus->output_fd, iov, m->n_iovec); | |
992 | else { | |
7f4e6a1c ZJS |
993 | struct msghdr mh = { |
994 | .msg_iov = iov, | |
995 | .msg_iovlen = m->n_iovec, | |
996 | }; | |
15d5af81 | 997 | |
f29eef2e | 998 | if (m->n_fds > 0 && *idx == 0) { |
15d5af81 | 999 | struct cmsghdr *control; |
15d5af81 | 1000 | |
7f4e6a1c ZJS |
1001 | mh.msg_control = control = alloca(CMSG_SPACE(sizeof(int) * m->n_fds)); |
1002 | mh.msg_controllen = control->cmsg_len = CMSG_LEN(sizeof(int) * m->n_fds); | |
15d5af81 LP |
1003 | control->cmsg_level = SOL_SOCKET; |
1004 | control->cmsg_type = SCM_RIGHTS; | |
15d5af81 LP |
1005 | memcpy(CMSG_DATA(control), m->fds, sizeof(int) * m->n_fds); |
1006 | } | |
1007 | ||
15d5af81 LP |
1008 | k = sendmsg(bus->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); |
1009 | if (k < 0 && errno == ENOTSOCK) { | |
1010 | bus->prefer_writev = true; | |
1011 | k = writev(bus->output_fd, iov, m->n_iovec); | |
1012 | } | |
1013 | } | |
a7e3212d | 1014 | |
a7e3212d LP |
1015 | if (k < 0) |
1016 | return errno == EAGAIN ? 0 : -errno; | |
1017 | ||
1018 | *idx += (size_t) k; | |
1019 | return 1; | |
1020 | } | |
1021 | ||
1022 | static int bus_socket_read_message_need(sd_bus *bus, size_t *need) { | |
1023 | uint32_t a, b; | |
1024 | uint8_t e; | |
1025 | uint64_t sum; | |
1026 | ||
1027 | assert(bus); | |
1028 | assert(need); | |
945c2931 | 1029 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1030 | |
1031 | if (bus->rbuffer_size < sizeof(struct bus_header)) { | |
1032 | *need = sizeof(struct bus_header) + 8; | |
1033 | ||
1034 | /* Minimum message size: | |
1035 | * | |
1036 | * Header + | |
1037 | * | |
1038 | * Method Call: +2 string headers | |
1039 | * Signal: +3 string headers | |
1040 | * Method Error: +1 string headers | |
1041 | * +1 uint32 headers | |
1042 | * Method Reply: +1 uint32 headers | |
1043 | * | |
1044 | * A string header is at least 9 bytes | |
1045 | * A uint32 header is at least 8 bytes | |
1046 | * | |
1047 | * Hence the minimum message size of a valid message | |
1048 | * is header + 8 bytes */ | |
1049 | ||
1050 | return 0; | |
1051 | } | |
1052 | ||
1053 | a = ((const uint32_t*) bus->rbuffer)[1]; | |
1054 | b = ((const uint32_t*) bus->rbuffer)[3]; | |
1055 | ||
1056 | e = ((const uint8_t*) bus->rbuffer)[0]; | |
0461f8cd | 1057 | if (e == BUS_LITTLE_ENDIAN) { |
a7e3212d LP |
1058 | a = le32toh(a); |
1059 | b = le32toh(b); | |
0461f8cd | 1060 | } else if (e == BUS_BIG_ENDIAN) { |
a7e3212d LP |
1061 | a = be32toh(a); |
1062 | b = be32toh(b); | |
1063 | } else | |
1064 | return -EBADMSG; | |
1065 | ||
1066 | sum = (uint64_t) sizeof(struct bus_header) + (uint64_t) ALIGN_TO(b, 8) + (uint64_t) a; | |
1067 | if (sum >= BUS_MESSAGE_SIZE_MAX) | |
1068 | return -ENOBUFS; | |
1069 | ||
1070 | *need = (size_t) sum; | |
1071 | return 0; | |
1072 | } | |
1073 | ||
7d22c717 | 1074 | static int bus_socket_make_message(sd_bus *bus, size_t size) { |
a7e3212d LP |
1075 | sd_bus_message *t; |
1076 | void *b; | |
1077 | int r; | |
1078 | ||
1079 | assert(bus); | |
a7e3212d | 1080 | assert(bus->rbuffer_size >= size); |
945c2931 | 1081 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 1082 | |
7adc46fc LP |
1083 | r = bus_rqueue_make_room(bus); |
1084 | if (r < 0) | |
1085 | return r; | |
1086 | ||
a7e3212d LP |
1087 | if (bus->rbuffer_size > size) { |
1088 | b = memdup((const uint8_t*) bus->rbuffer + size, | |
1089 | bus->rbuffer_size - size); | |
1090 | if (!b) | |
1091 | return -ENOMEM; | |
1092 | } else | |
1093 | b = NULL; | |
1094 | ||
df2d202e LP |
1095 | r = bus_message_from_malloc(bus, |
1096 | bus->rbuffer, size, | |
a7e3212d | 1097 | bus->fds, bus->n_fds, |
038f9863 | 1098 | NULL, |
a7e3212d LP |
1099 | &t); |
1100 | if (r < 0) { | |
1101 | free(b); | |
1102 | return r; | |
1103 | } | |
1104 | ||
1105 | bus->rbuffer = b; | |
1106 | bus->rbuffer_size -= size; | |
1107 | ||
1108 | bus->fds = NULL; | |
1109 | bus->n_fds = 0; | |
1110 | ||
7adc46fc | 1111 | bus->rqueue[bus->rqueue_size++] = t; |
7d22c717 | 1112 | |
a7e3212d LP |
1113 | return 1; |
1114 | } | |
1115 | ||
7d22c717 | 1116 | int bus_socket_read_message(sd_bus *bus) { |
a7e3212d | 1117 | struct msghdr mh; |
7f4e6a1c | 1118 | struct iovec iov = {}; |
a7e3212d LP |
1119 | ssize_t k; |
1120 | size_t need; | |
1121 | int r; | |
1122 | void *b; | |
1123 | union { | |
1124 | struct cmsghdr cmsghdr; | |
d868f2a3 | 1125 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
a7e3212d | 1126 | } control; |
4d3a5b10 | 1127 | bool handle_cmsg = false; |
a7e3212d LP |
1128 | |
1129 | assert(bus); | |
945c2931 | 1130 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1131 | |
1132 | r = bus_socket_read_message_need(bus, &need); | |
1133 | if (r < 0) | |
1134 | return r; | |
1135 | ||
1136 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1137 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1138 | |
1139 | b = realloc(bus->rbuffer, need); | |
1140 | if (!b) | |
1141 | return -ENOMEM; | |
1142 | ||
1143 | bus->rbuffer = b; | |
1144 | ||
5cfa2c3d | 1145 | iov = IOVEC_MAKE((uint8_t *)bus->rbuffer + bus->rbuffer_size, need - bus->rbuffer_size); |
a7e3212d | 1146 | |
15d5af81 LP |
1147 | if (bus->prefer_readv) |
1148 | k = readv(bus->input_fd, &iov, 1); | |
1149 | else { | |
1150 | zero(mh); | |
1151 | mh.msg_iov = &iov; | |
1152 | mh.msg_iovlen = 1; | |
1153 | mh.msg_control = &control; | |
1154 | mh.msg_controllen = sizeof(control); | |
1155 | ||
a6887cc0 | 1156 | k = recvmsg(bus->input_fd, &mh, MSG_DONTWAIT|MSG_CMSG_CLOEXEC); |
15d5af81 LP |
1157 | if (k < 0 && errno == ENOTSOCK) { |
1158 | bus->prefer_readv = true; | |
1159 | k = readv(bus->input_fd, &iov, 1); | |
1160 | } else | |
1161 | handle_cmsg = true; | |
1162 | } | |
a7e3212d LP |
1163 | if (k < 0) |
1164 | return errno == EAGAIN ? 0 : -errno; | |
1165 | if (k == 0) | |
1166 | return -ECONNRESET; | |
1167 | ||
1168 | bus->rbuffer_size += k; | |
1169 | ||
2a1288ff LP |
1170 | if (handle_cmsg) { |
1171 | struct cmsghdr *cmsg; | |
1172 | ||
1173 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
1174 | if (cmsg->cmsg_level == SOL_SOCKET && |
1175 | cmsg->cmsg_type == SCM_RIGHTS) { | |
7fe2903c | 1176 | int n, *f, i; |
15d5af81 LP |
1177 | |
1178 | n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
1179 | ||
1180 | if (!bus->can_fds) { | |
1181 | /* Whut? We received fds but this | |
1182 | * isn't actually enabled? Close them, | |
1183 | * and fail */ | |
1184 | ||
1185 | close_many((int*) CMSG_DATA(cmsg), n); | |
1186 | return -EIO; | |
1187 | } | |
1188 | ||
62d74c78 | 1189 | f = reallocarray(bus->fds, bus->n_fds + n, sizeof(int)); |
15d5af81 LP |
1190 | if (!f) { |
1191 | close_many((int*) CMSG_DATA(cmsg), n); | |
1192 | return -ENOMEM; | |
1193 | } | |
1194 | ||
7fe2903c LP |
1195 | for (i = 0; i < n; i++) |
1196 | f[bus->n_fds++] = fd_move_above_stdio(((int*) CMSG_DATA(cmsg))[i]); | |
15d5af81 | 1197 | bus->fds = f; |
d868f2a3 ZJS |
1198 | } else |
1199 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
1200 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 1201 | } |
a7e3212d LP |
1202 | |
1203 | r = bus_socket_read_message_need(bus, &need); | |
1204 | if (r < 0) | |
1205 | return r; | |
1206 | ||
1207 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1208 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1209 | |
1210 | return 1; | |
1211 | } | |
1212 | ||
1213 | int bus_socket_process_opening(sd_bus *b) { | |
1214 | int error = 0; | |
1215 | socklen_t slen = sizeof(error); | |
b92bea5d ZJS |
1216 | struct pollfd p = { |
1217 | .fd = b->output_fd, | |
1218 | .events = POLLOUT, | |
1219 | }; | |
a7e3212d LP |
1220 | int r; |
1221 | ||
a7e3212d LP |
1222 | assert(b->state == BUS_OPENING); |
1223 | ||
a7e3212d LP |
1224 | r = poll(&p, 1, 0); |
1225 | if (r < 0) | |
1226 | return -errno; | |
1227 | ||
1228 | if (!(p.revents & (POLLOUT|POLLERR|POLLHUP))) | |
1229 | return 0; | |
1230 | ||
e82c9509 | 1231 | r = getsockopt(b->output_fd, SOL_SOCKET, SO_ERROR, &error, &slen); |
a7e3212d LP |
1232 | if (r < 0) |
1233 | b->last_connect_error = errno; | |
1234 | else if (error != 0) | |
1235 | b->last_connect_error = error; | |
1236 | else if (p.revents & (POLLERR|POLLHUP)) | |
1237 | b->last_connect_error = ECONNREFUSED; | |
1238 | else | |
1239 | return bus_socket_start_auth(b); | |
1240 | ||
1241 | return bus_next_address(b); | |
1242 | } | |
1243 | ||
1244 | int bus_socket_process_authenticating(sd_bus *b) { | |
1245 | int r; | |
1246 | ||
1247 | assert(b); | |
1248 | assert(b->state == BUS_AUTHENTICATING); | |
1249 | ||
1250 | if (now(CLOCK_MONOTONIC) >= b->auth_timeout) | |
1251 | return -ETIMEDOUT; | |
1252 | ||
1253 | r = bus_socket_write_auth(b); | |
1254 | if (r != 0) | |
1255 | return r; | |
1256 | ||
1257 | return bus_socket_read_auth(b); | |
1258 | } | |
8a5cd31e LP |
1259 | |
1260 | int bus_socket_process_watch_bind(sd_bus *b) { | |
1261 | int r, q; | |
1262 | ||
1263 | assert(b); | |
1264 | assert(b->state == BUS_WATCH_BIND); | |
1265 | assert(b->inotify_fd >= 0); | |
1266 | ||
1267 | r = flush_fd(b->inotify_fd); | |
1268 | if (r <= 0) | |
1269 | return r; | |
1270 | ||
1271 | log_debug("Got inotify event on bus %s.", strna(b->description)); | |
1272 | ||
1273 | /* We flushed events out of the inotify fd. In that case, maybe the socket is valid now? Let's try to connect | |
1274 | * to it again */ | |
1275 | ||
1276 | r = bus_socket_connect(b); | |
1277 | if (r < 0) | |
1278 | return r; | |
1279 | ||
1280 | q = bus_attach_io_events(b); | |
1281 | if (q < 0) | |
1282 | return q; | |
1283 | ||
1284 | q = bus_attach_inotify_event(b); | |
1285 | if (q < 0) | |
1286 | return q; | |
1287 | ||
1288 | return r; | |
1289 | } |