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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
a7e3212d | 2 | /*** |
a7e3212d | 3 | Copyright 2013 Lennart Poettering |
a7e3212d LP |
4 | ***/ |
5 | ||
6 | #include <endian.h> | |
07630cea | 7 | #include <poll.h> |
a7e3212d LP |
8 | #include <stdlib.h> |
9 | #include <unistd.h> | |
a7e3212d | 10 | |
07630cea | 11 | #include "sd-bus.h" |
24882e06 | 12 | #include "sd-daemon.h" |
07630cea | 13 | |
b5efdb8a | 14 | #include "alloc-util.h" |
07630cea LP |
15 | #include "bus-internal.h" |
16 | #include "bus-message.h" | |
3ffd4af2 LP |
17 | #include "bus-socket.h" |
18 | #include "fd-util.h" | |
f97b34a6 | 19 | #include "format-util.h" |
8a5cd31e | 20 | #include "fs-util.h" |
15a5e950 | 21 | #include "hexdecoct.h" |
8a5cd31e | 22 | #include "io-util.h" |
a7e3212d LP |
23 | #include "macro.h" |
24 | #include "missing.h" | |
8a5cd31e | 25 | #include "path-util.h" |
dccca82b | 26 | #include "process-util.h" |
7fc04b12 | 27 | #include "selinux-util.h" |
24882e06 | 28 | #include "signal-util.h" |
15a5e950 | 29 | #include "stdio-util.h" |
07630cea | 30 | #include "string-util.h" |
b1d4f8e1 | 31 | #include "user-util.h" |
07630cea LP |
32 | #include "utf8.h" |
33 | #include "util.h" | |
a7e3212d | 34 | |
aec6d91f LP |
35 | #define SNDBUF_SIZE (8*1024*1024) |
36 | ||
2181a7f5 | 37 | static void iovec_advance(struct iovec iov[], unsigned *idx, size_t size) { |
a7e3212d LP |
38 | |
39 | while (size > 0) { | |
40 | struct iovec *i = iov + *idx; | |
41 | ||
42 | if (i->iov_len > size) { | |
43 | i->iov_base = (uint8_t*) i->iov_base + size; | |
44 | i->iov_len -= size; | |
45 | return; | |
46 | } | |
47 | ||
48 | size -= i->iov_len; | |
49 | ||
50 | i->iov_base = NULL; | |
51 | i->iov_len = 0; | |
52 | ||
313cefa1 | 53 | (*idx)++; |
a7e3212d LP |
54 | } |
55 | } | |
56 | ||
bc7fd8cd | 57 | static int append_iovec(sd_bus_message *m, const void *p, size_t sz) { |
2100fa10 LP |
58 | assert(m); |
59 | assert(p); | |
60 | assert(sz > 0); | |
61 | ||
62 | m->iovec[m->n_iovec].iov_base = (void*) p; | |
63 | m->iovec[m->n_iovec].iov_len = sz; | |
64 | m->n_iovec++; | |
bc7fd8cd LP |
65 | |
66 | return 0; | |
2100fa10 LP |
67 | } |
68 | ||
bc7fd8cd LP |
69 | static int bus_message_setup_iovec(sd_bus_message *m) { |
70 | struct bus_body_part *part; | |
13c299d3 | 71 | unsigned n, i; |
bc7fd8cd LP |
72 | int r; |
73 | ||
2100fa10 LP |
74 | assert(m); |
75 | assert(m->sealed); | |
76 | ||
77 | if (m->n_iovec > 0) | |
bc7fd8cd LP |
78 | return 0; |
79 | ||
80 | assert(!m->iovec); | |
2100fa10 | 81 | |
c91cb83c | 82 | n = 1 + m->n_body_parts; |
bc7fd8cd LP |
83 | if (n < ELEMENTSOF(m->iovec_fixed)) |
84 | m->iovec = m->iovec_fixed; | |
85 | else { | |
86 | m->iovec = new(struct iovec, n); | |
66b26c5c LP |
87 | if (!m->iovec) { |
88 | r = -ENOMEM; | |
89 | goto fail; | |
90 | } | |
bc7fd8cd | 91 | } |
2100fa10 | 92 | |
c91cb83c | 93 | r = append_iovec(m, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
bc7fd8cd | 94 | if (r < 0) |
66b26c5c | 95 | goto fail; |
2100fa10 | 96 | |
9b29bb68 | 97 | MESSAGE_FOREACH_PART(part, i, m) { |
66b26c5c LP |
98 | r = bus_body_part_map(part); |
99 | if (r < 0) | |
100 | goto fail; | |
101 | ||
bc7fd8cd LP |
102 | r = append_iovec(m, part->data, part->size); |
103 | if (r < 0) | |
66b26c5c | 104 | goto fail; |
bc7fd8cd LP |
105 | } |
106 | ||
107 | assert(n == m->n_iovec); | |
108 | ||
109 | return 0; | |
66b26c5c LP |
110 | |
111 | fail: | |
112 | m->poisoned = true; | |
113 | return r; | |
2100fa10 LP |
114 | } |
115 | ||
2181a7f5 LP |
116 | bool bus_socket_auth_needs_write(sd_bus *b) { |
117 | ||
118 | unsigned i; | |
119 | ||
120 | if (b->auth_index >= ELEMENTSOF(b->auth_iovec)) | |
121 | return false; | |
122 | ||
123 | for (i = b->auth_index; i < ELEMENTSOF(b->auth_iovec); i++) { | |
124 | struct iovec *j = b->auth_iovec + i; | |
125 | ||
126 | if (j->iov_len > 0) | |
127 | return true; | |
128 | } | |
129 | ||
130 | return false; | |
131 | } | |
132 | ||
a7e3212d | 133 | static int bus_socket_write_auth(sd_bus *b) { |
a7e3212d LP |
134 | ssize_t k; |
135 | ||
136 | assert(b); | |
137 | assert(b->state == BUS_AUTHENTICATING); | |
138 | ||
2181a7f5 | 139 | if (!bus_socket_auth_needs_write(b)) |
a7e3212d LP |
140 | return 0; |
141 | ||
15d5af81 LP |
142 | if (b->prefer_writev) |
143 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
144 | else { | |
145 | struct msghdr mh; | |
146 | zero(mh); | |
147 | ||
148 | mh.msg_iov = b->auth_iovec + b->auth_index; | |
149 | mh.msg_iovlen = ELEMENTSOF(b->auth_iovec) - b->auth_index; | |
150 | ||
151 | k = sendmsg(b->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
152 | if (k < 0 && errno == ENOTSOCK) { | |
153 | b->prefer_writev = true; | |
154 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
155 | } | |
156 | } | |
a7e3212d | 157 | |
a7e3212d LP |
158 | if (k < 0) |
159 | return errno == EAGAIN ? 0 : -errno; | |
160 | ||
161 | iovec_advance(b->auth_iovec, &b->auth_index, (size_t) k); | |
a7e3212d LP |
162 | return 1; |
163 | } | |
164 | ||
2181a7f5 | 165 | static int bus_socket_auth_verify_client(sd_bus *b) { |
a7e3212d LP |
166 | char *e, *f, *start; |
167 | sd_id128_t peer; | |
168 | unsigned i; | |
169 | int r; | |
170 | ||
2181a7f5 LP |
171 | assert(b); |
172 | ||
a7e3212d LP |
173 | /* We expect two response lines: "OK" and possibly |
174 | * "AGREE_UNIX_FD" */ | |
175 | ||
6e6c21c8 | 176 | e = memmem_safe(b->rbuffer, b->rbuffer_size, "\r\n", 2); |
a7e3212d LP |
177 | if (!e) |
178 | return 0; | |
179 | ||
c7db1984 | 180 | if (b->accept_fd) { |
a7e3212d LP |
181 | f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2); |
182 | if (!f) | |
183 | return 0; | |
184 | ||
185 | start = f + 2; | |
186 | } else { | |
187 | f = NULL; | |
188 | start = e + 2; | |
189 | } | |
190 | ||
191 | /* Nice! We got all the lines we need. First check the OK | |
192 | * line */ | |
193 | ||
194 | if (e - (char*) b->rbuffer != 3 + 32) | |
195 | return -EPERM; | |
196 | ||
197 | if (memcmp(b->rbuffer, "OK ", 3)) | |
198 | return -EPERM; | |
199 | ||
2181a7f5 LP |
200 | b->auth = b->anonymous_auth ? BUS_AUTH_ANONYMOUS : BUS_AUTH_EXTERNAL; |
201 | ||
a7e3212d LP |
202 | for (i = 0; i < 32; i += 2) { |
203 | int x, y; | |
204 | ||
205 | x = unhexchar(((char*) b->rbuffer)[3 + i]); | |
206 | y = unhexchar(((char*) b->rbuffer)[3 + i + 1]); | |
207 | ||
208 | if (x < 0 || y < 0) | |
209 | return -EINVAL; | |
210 | ||
211 | peer.bytes[i/2] = ((uint8_t) x << 4 | (uint8_t) y); | |
212 | } | |
213 | ||
3bbaff3e | 214 | if (!sd_id128_is_null(b->server_id) && |
98178d39 | 215 | !sd_id128_equal(b->server_id, peer)) |
a7e3212d LP |
216 | return -EPERM; |
217 | ||
98178d39 | 218 | b->server_id = peer; |
a7e3212d LP |
219 | |
220 | /* And possibly check the second line, too */ | |
221 | ||
222 | if (f) | |
223 | b->can_fds = | |
fbd0b64f LP |
224 | (f - e == STRLEN("\r\nAGREE_UNIX_FD")) && |
225 | memcmp(e + 2, "AGREE_UNIX_FD", | |
226 | STRLEN("AGREE_UNIX_FD")) == 0; | |
a7e3212d LP |
227 | |
228 | b->rbuffer_size -= (start - (char*) b->rbuffer); | |
229 | memmove(b->rbuffer, start, b->rbuffer_size); | |
230 | ||
231 | r = bus_start_running(b); | |
232 | if (r < 0) | |
233 | return r; | |
234 | ||
235 | return 1; | |
236 | } | |
237 | ||
2181a7f5 LP |
238 | static bool line_equals(const char *s, size_t m, const char *line) { |
239 | size_t l; | |
240 | ||
241 | l = strlen(line); | |
242 | if (l != m) | |
243 | return false; | |
244 | ||
245 | return memcmp(s, line, l) == 0; | |
246 | } | |
247 | ||
248 | static bool line_begins(const char *s, size_t m, const char *word) { | |
d27b725a | 249 | const char *p; |
2181a7f5 | 250 | |
d27b725a LP |
251 | p = memory_startswith(s, m, word); |
252 | if (!p) | |
2181a7f5 LP |
253 | return false; |
254 | ||
d27b725a | 255 | return IN_SET(*p, 0, ' '); |
2181a7f5 LP |
256 | } |
257 | ||
258 | static int verify_anonymous_token(sd_bus *b, const char *p, size_t l) { | |
259 | _cleanup_free_ char *token = NULL; | |
30494563 TG |
260 | size_t len; |
261 | int r; | |
2181a7f5 LP |
262 | |
263 | if (!b->anonymous_auth) | |
264 | return 0; | |
265 | ||
266 | if (l <= 0) | |
267 | return 1; | |
268 | ||
269 | assert(p[0] == ' '); | |
270 | p++; l--; | |
271 | ||
272 | if (l % 2 != 0) | |
273 | return 0; | |
2181a7f5 | 274 | |
30494563 TG |
275 | r = unhexmem(p, l, (void **) &token, &len); |
276 | if (r < 0) | |
277 | return 0; | |
278 | ||
279 | if (memchr(token, 0, len)) | |
2181a7f5 LP |
280 | return 0; |
281 | ||
282 | return !!utf8_is_valid(token); | |
283 | } | |
284 | ||
285 | static int verify_external_token(sd_bus *b, const char *p, size_t l) { | |
286 | _cleanup_free_ char *token = NULL; | |
30494563 | 287 | size_t len; |
2181a7f5 LP |
288 | uid_t u; |
289 | int r; | |
290 | ||
291 | /* We don't do any real authentication here. Instead, we if | |
292 | * the owner of this bus wanted authentication he should have | |
293 | * checked SO_PEERCRED before even creating the bus object. */ | |
294 | ||
8411d2a2 | 295 | if (!b->anonymous_auth && !b->ucred_valid) |
2181a7f5 LP |
296 | return 0; |
297 | ||
298 | if (l <= 0) | |
299 | return 1; | |
300 | ||
301 | assert(p[0] == ' '); | |
302 | p++; l--; | |
303 | ||
304 | if (l % 2 != 0) | |
305 | return 0; | |
306 | ||
30494563 TG |
307 | r = unhexmem(p, l, (void**) &token, &len); |
308 | if (r < 0) | |
309 | return 0; | |
2181a7f5 | 310 | |
30494563 | 311 | if (memchr(token, 0, len)) |
2181a7f5 LP |
312 | return 0; |
313 | ||
314 | r = parse_uid(token, &u); | |
315 | if (r < 0) | |
316 | return 0; | |
317 | ||
8411d2a2 LP |
318 | /* We ignore the passed value if anonymous authentication is |
319 | * on anyway. */ | |
320 | if (!b->anonymous_auth && u != b->ucred.uid) | |
2181a7f5 LP |
321 | return 0; |
322 | ||
323 | return 1; | |
324 | } | |
325 | ||
326 | static int bus_socket_auth_write(sd_bus *b, const char *t) { | |
327 | char *p; | |
328 | size_t l; | |
329 | ||
330 | assert(b); | |
331 | assert(t); | |
332 | ||
333 | /* We only make use of the first iovec */ | |
945c2931 | 334 | assert(IN_SET(b->auth_index, 0, 1)); |
2181a7f5 LP |
335 | |
336 | l = strlen(t); | |
337 | p = malloc(b->auth_iovec[0].iov_len + l); | |
338 | if (!p) | |
339 | return -ENOMEM; | |
340 | ||
75f32f04 | 341 | memcpy_safe(p, b->auth_iovec[0].iov_base, b->auth_iovec[0].iov_len); |
2181a7f5 LP |
342 | memcpy(p + b->auth_iovec[0].iov_len, t, l); |
343 | ||
344 | b->auth_iovec[0].iov_base = p; | |
345 | b->auth_iovec[0].iov_len += l; | |
346 | ||
347 | free(b->auth_buffer); | |
348 | b->auth_buffer = p; | |
349 | b->auth_index = 0; | |
350 | return 0; | |
351 | } | |
352 | ||
353 | static int bus_socket_auth_write_ok(sd_bus *b) { | |
354 | char t[3 + 32 + 2 + 1]; | |
355 | ||
356 | assert(b); | |
357 | ||
5ffa8c81 | 358 | xsprintf(t, "OK " SD_ID128_FORMAT_STR "\r\n", SD_ID128_FORMAT_VAL(b->server_id)); |
2181a7f5 LP |
359 | |
360 | return bus_socket_auth_write(b, t); | |
361 | } | |
362 | ||
363 | static int bus_socket_auth_verify_server(sd_bus *b) { | |
364 | char *e; | |
365 | const char *line; | |
366 | size_t l; | |
367 | bool processed = false; | |
368 | int r; | |
369 | ||
370 | assert(b); | |
371 | ||
2b4ac889 | 372 | if (b->rbuffer_size < 1) |
2181a7f5 LP |
373 | return 0; |
374 | ||
375 | /* First char must be a NUL byte */ | |
376 | if (*(char*) b->rbuffer != 0) | |
377 | return -EIO; | |
378 | ||
2b4ac889 LP |
379 | if (b->rbuffer_size < 3) |
380 | return 0; | |
381 | ||
2181a7f5 LP |
382 | /* Begin with the first line */ |
383 | if (b->auth_rbegin <= 0) | |
384 | b->auth_rbegin = 1; | |
385 | ||
386 | for (;;) { | |
387 | /* Check if line is complete */ | |
388 | line = (char*) b->rbuffer + b->auth_rbegin; | |
389 | e = memmem(line, b->rbuffer_size - b->auth_rbegin, "\r\n", 2); | |
390 | if (!e) | |
391 | return processed; | |
392 | ||
393 | l = e - line; | |
394 | ||
395 | if (line_begins(line, l, "AUTH ANONYMOUS")) { | |
396 | ||
397 | r = verify_anonymous_token(b, line + 14, l - 14); | |
398 | if (r < 0) | |
399 | return r; | |
400 | if (r == 0) | |
401 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
402 | else { | |
403 | b->auth = BUS_AUTH_ANONYMOUS; | |
404 | r = bus_socket_auth_write_ok(b); | |
405 | } | |
406 | ||
407 | } else if (line_begins(line, l, "AUTH EXTERNAL")) { | |
408 | ||
409 | r = verify_external_token(b, line + 13, l - 13); | |
410 | if (r < 0) | |
411 | return r; | |
412 | if (r == 0) | |
413 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
414 | else { | |
415 | b->auth = BUS_AUTH_EXTERNAL; | |
416 | r = bus_socket_auth_write_ok(b); | |
417 | } | |
418 | ||
419 | } else if (line_begins(line, l, "AUTH")) | |
420 | r = bus_socket_auth_write(b, "REJECTED EXTERNAL ANONYMOUS\r\n"); | |
421 | else if (line_equals(line, l, "CANCEL") || | |
422 | line_begins(line, l, "ERROR")) { | |
423 | ||
424 | b->auth = _BUS_AUTH_INVALID; | |
425 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
426 | ||
427 | } else if (line_equals(line, l, "BEGIN")) { | |
428 | ||
429 | if (b->auth == _BUS_AUTH_INVALID) | |
430 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
431 | else { | |
432 | /* We can't leave from the auth phase | |
433 | * before we haven't written | |
434 | * everything queued, so let's check | |
435 | * that */ | |
436 | ||
437 | if (bus_socket_auth_needs_write(b)) | |
438 | return 1; | |
439 | ||
440 | b->rbuffer_size -= (e + 2 - (char*) b->rbuffer); | |
441 | memmove(b->rbuffer, e + 2, b->rbuffer_size); | |
442 | return bus_start_running(b); | |
443 | } | |
444 | ||
445 | } else if (line_begins(line, l, "DATA")) { | |
446 | ||
447 | if (b->auth == _BUS_AUTH_INVALID) | |
448 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
449 | else { | |
450 | if (b->auth == BUS_AUTH_ANONYMOUS) | |
451 | r = verify_anonymous_token(b, line + 4, l - 4); | |
452 | else | |
453 | r = verify_external_token(b, line + 4, l - 4); | |
454 | ||
455 | if (r < 0) | |
456 | return r; | |
457 | if (r == 0) { | |
458 | b->auth = _BUS_AUTH_INVALID; | |
459 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
460 | } else | |
461 | r = bus_socket_auth_write_ok(b); | |
462 | } | |
463 | } else if (line_equals(line, l, "NEGOTIATE_UNIX_FD")) { | |
c7db1984 | 464 | if (b->auth == _BUS_AUTH_INVALID || !b->accept_fd) |
2181a7f5 LP |
465 | r = bus_socket_auth_write(b, "ERROR\r\n"); |
466 | else { | |
467 | b->can_fds = true; | |
468 | r = bus_socket_auth_write(b, "AGREE_UNIX_FD\r\n"); | |
469 | } | |
470 | } else | |
471 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
472 | ||
473 | if (r < 0) | |
474 | return r; | |
475 | ||
476 | b->auth_rbegin = e + 2 - (char*) b->rbuffer; | |
477 | ||
478 | processed = true; | |
479 | } | |
480 | } | |
481 | ||
482 | static int bus_socket_auth_verify(sd_bus *b) { | |
483 | assert(b); | |
484 | ||
485 | if (b->is_server) | |
486 | return bus_socket_auth_verify_server(b); | |
487 | else | |
488 | return bus_socket_auth_verify_client(b); | |
489 | } | |
490 | ||
a7e3212d LP |
491 | static int bus_socket_read_auth(sd_bus *b) { |
492 | struct msghdr mh; | |
7f4e6a1c | 493 | struct iovec iov = {}; |
a7e3212d LP |
494 | size_t n; |
495 | ssize_t k; | |
496 | int r; | |
497 | void *p; | |
2181a7f5 LP |
498 | union { |
499 | struct cmsghdr cmsghdr; | |
d868f2a3 | 500 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
2181a7f5 | 501 | } control; |
15d5af81 | 502 | bool handle_cmsg = false; |
a7e3212d LP |
503 | |
504 | assert(b); | |
2181a7f5 | 505 | assert(b->state == BUS_AUTHENTICATING); |
a7e3212d LP |
506 | |
507 | r = bus_socket_auth_verify(b); | |
508 | if (r != 0) | |
509 | return r; | |
510 | ||
9607d947 | 511 | n = MAX(256u, b->rbuffer_size * 2); |
a7e3212d LP |
512 | |
513 | if (n > BUS_AUTH_SIZE_MAX) | |
514 | n = BUS_AUTH_SIZE_MAX; | |
515 | ||
516 | if (b->rbuffer_size >= n) | |
517 | return -ENOBUFS; | |
518 | ||
519 | p = realloc(b->rbuffer, n); | |
520 | if (!p) | |
521 | return -ENOMEM; | |
522 | ||
523 | b->rbuffer = p; | |
524 | ||
a7e3212d LP |
525 | iov.iov_base = (uint8_t*) b->rbuffer + b->rbuffer_size; |
526 | iov.iov_len = n - b->rbuffer_size; | |
527 | ||
15d5af81 LP |
528 | if (b->prefer_readv) |
529 | k = readv(b->input_fd, &iov, 1); | |
530 | else { | |
531 | zero(mh); | |
532 | mh.msg_iov = &iov; | |
533 | mh.msg_iovlen = 1; | |
534 | mh.msg_control = &control; | |
535 | mh.msg_controllen = sizeof(control); | |
536 | ||
537 | k = recvmsg(b->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); | |
538 | if (k < 0 && errno == ENOTSOCK) { | |
539 | b->prefer_readv = true; | |
540 | k = readv(b->input_fd, &iov, 1); | |
541 | } else | |
542 | handle_cmsg = true; | |
543 | } | |
a7e3212d LP |
544 | if (k < 0) |
545 | return errno == EAGAIN ? 0 : -errno; | |
546 | if (k == 0) | |
547 | return -ECONNRESET; | |
548 | ||
549 | b->rbuffer_size += k; | |
550 | ||
2a1288ff LP |
551 | if (handle_cmsg) { |
552 | struct cmsghdr *cmsg; | |
553 | ||
554 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
555 | if (cmsg->cmsg_level == SOL_SOCKET && |
556 | cmsg->cmsg_type == SCM_RIGHTS) { | |
557 | int j; | |
558 | ||
559 | /* Whut? We received fds during the auth | |
560 | * protocol? Somebody is playing games with | |
561 | * us. Close them all, and fail */ | |
562 | j = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
563 | close_many((int*) CMSG_DATA(cmsg), j); | |
564 | return -EIO; | |
d868f2a3 ZJS |
565 | } else |
566 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
567 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 568 | } |
2181a7f5 | 569 | |
a7e3212d LP |
570 | r = bus_socket_auth_verify(b); |
571 | if (r != 0) | |
572 | return r; | |
573 | ||
574 | return 1; | |
575 | } | |
576 | ||
8f04d2eb | 577 | void bus_socket_setup(sd_bus *b) { |
a7e3212d LP |
578 | assert(b); |
579 | ||
aec6d91f | 580 | /* Increase the buffers to 8 MB */ |
6ae22ffb LP |
581 | (void) fd_inc_rcvbuf(b->input_fd, SNDBUF_SIZE); |
582 | (void) fd_inc_sndbuf(b->output_fd, SNDBUF_SIZE); | |
a7e3212d | 583 | |
e1d337d4 | 584 | b->message_version = 1; |
0f437184 | 585 | b->message_endian = 0; |
8f04d2eb | 586 | } |
e1d337d4 | 587 | |
8f04d2eb | 588 | static void bus_get_peercred(sd_bus *b) { |
c4e6556c ZJS |
589 | int r; |
590 | ||
8f04d2eb | 591 | assert(b); |
18ac4643 LP |
592 | assert(!b->ucred_valid); |
593 | assert(!b->label); | |
594 | assert(b->n_groups == (size_t) -1); | |
8f04d2eb LP |
595 | |
596 | /* Get the peer for socketpair() sockets */ | |
eff05270 | 597 | b->ucred_valid = getpeercred(b->input_fd, &b->ucred) >= 0; |
c4e6556c ZJS |
598 | |
599 | /* Get the SELinux context of the peer */ | |
db7d1dca | 600 | r = getpeersec(b->input_fd, &b->label); |
18ac4643 | 601 | if (r < 0 && !IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) |
db7d1dca | 602 | log_debug_errno(r, "Failed to determine peer security context: %m"); |
18ac4643 LP |
603 | |
604 | /* Get the list of auxiliary groups of the peer */ | |
605 | r = getpeergroups(b->input_fd, &b->groups); | |
c599b325 | 606 | if (r >= 0) |
18ac4643 | 607 | b->n_groups = (size_t) r; |
c599b325 ZJS |
608 | else if (!IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) |
609 | log_debug_errno(r, "Failed to determine peer's group list: %m"); | |
a7e3212d LP |
610 | } |
611 | ||
2181a7f5 | 612 | static int bus_socket_start_auth_client(sd_bus *b) { |
a7e3212d | 613 | size_t l; |
2181a7f5 | 614 | const char *auth_suffix, *auth_prefix; |
a7e3212d LP |
615 | |
616 | assert(b); | |
617 | ||
2181a7f5 LP |
618 | if (b->anonymous_auth) { |
619 | auth_prefix = "\0AUTH ANONYMOUS "; | |
a7e3212d | 620 | |
2181a7f5 LP |
621 | /* For ANONYMOUS auth we send some arbitrary "trace" string */ |
622 | l = 9; | |
623 | b->auth_buffer = hexmem("anonymous", l); | |
624 | } else { | |
5ffa8c81 | 625 | char text[DECIMAL_STR_MAX(uid_t) + 1]; |
a7e3212d | 626 | |
2181a7f5 | 627 | auth_prefix = "\0AUTH EXTERNAL "; |
a7e3212d | 628 | |
5ffa8c81 | 629 | xsprintf(text, UID_FMT, geteuid()); |
a7e3212d | 630 | |
2181a7f5 LP |
631 | l = strlen(text); |
632 | b->auth_buffer = hexmem(text, l); | |
633 | } | |
634 | ||
635 | if (!b->auth_buffer) | |
a7e3212d LP |
636 | return -ENOMEM; |
637 | ||
c7db1984 | 638 | if (b->accept_fd) |
2181a7f5 LP |
639 | auth_suffix = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n"; |
640 | else | |
641 | auth_suffix = "\r\nBEGIN\r\n"; | |
a7e3212d LP |
642 | |
643 | b->auth_iovec[0].iov_base = (void*) auth_prefix; | |
2181a7f5 LP |
644 | b->auth_iovec[0].iov_len = 1 + strlen(auth_prefix + 1); |
645 | b->auth_iovec[1].iov_base = (void*) b->auth_buffer; | |
a7e3212d LP |
646 | b->auth_iovec[1].iov_len = l * 2; |
647 | b->auth_iovec[2].iov_base = (void*) auth_suffix; | |
648 | b->auth_iovec[2].iov_len = strlen(auth_suffix); | |
a7e3212d LP |
649 | |
650 | return bus_socket_write_auth(b); | |
651 | } | |
652 | ||
a7893c6b | 653 | int bus_socket_start_auth(sd_bus *b) { |
2181a7f5 LP |
654 | assert(b); |
655 | ||
8f04d2eb LP |
656 | bus_get_peercred(b); |
657 | ||
3e0e196e | 658 | bus_set_state(b, BUS_AUTHENTICATING); |
036d61b3 | 659 | b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_AUTH_TIMEOUT; |
2181a7f5 | 660 | |
9ab32f9d | 661 | if (sd_is_socket(b->input_fd, AF_UNIX, 0, 0) <= 0) |
c7db1984 | 662 | b->accept_fd = false; |
2181a7f5 | 663 | |
9ab32f9d LP |
664 | if (b->output_fd != b->input_fd) |
665 | if (sd_is_socket(b->output_fd, AF_UNIX, 0, 0) <= 0) | |
c7db1984 | 666 | b->accept_fd = false; |
e82c9509 | 667 | |
2181a7f5 LP |
668 | if (b->is_server) |
669 | return bus_socket_read_auth(b); | |
670 | else | |
671 | return bus_socket_start_auth_client(b); | |
672 | } | |
673 | ||
8a5cd31e LP |
674 | static int bus_socket_inotify_setup(sd_bus *b) { |
675 | _cleanup_free_ int *new_watches = NULL; | |
676 | _cleanup_free_ char *absolute = NULL; | |
677 | size_t n_allocated = 0, n = 0, done = 0, i; | |
678 | unsigned max_follow = 32; | |
679 | const char *p; | |
680 | int wd, r; | |
681 | ||
682 | assert(b); | |
683 | assert(b->watch_bind); | |
684 | assert(b->sockaddr.sa.sa_family == AF_UNIX); | |
685 | assert(b->sockaddr.un.sun_path[0] != 0); | |
686 | ||
687 | /* Sets up an inotify fd in case watch_bind is enabled: wait until the configured AF_UNIX file system socket | |
688 | * appears before connecting to it. The implemented is pretty simplistic: we just subscribe to relevant changes | |
689 | * to all prefix components of the path, and every time we get an event for that we try to reconnect again, | |
690 | * without actually caring what precisely the event we got told us. If we still can't connect we re-subscribe | |
691 | * to all relevant changes of anything in the path, so that our watches include any possibly newly created path | |
692 | * components. */ | |
693 | ||
694 | if (b->inotify_fd < 0) { | |
695 | b->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
696 | if (b->inotify_fd < 0) | |
697 | return -errno; | |
7fe2903c LP |
698 | |
699 | b->inotify_fd = fd_move_above_stdio(b->inotify_fd); | |
8a5cd31e LP |
700 | } |
701 | ||
702 | /* Make sure the path is NUL terminated */ | |
703 | p = strndupa(b->sockaddr.un.sun_path, sizeof(b->sockaddr.un.sun_path)); | |
704 | ||
705 | /* Make sure the path is absolute */ | |
706 | r = path_make_absolute_cwd(p, &absolute); | |
707 | if (r < 0) | |
708 | goto fail; | |
709 | ||
710 | /* Watch all parent directories, and don't mind any prefix that doesn't exist yet. For the innermost directory | |
711 | * that exists we want to know when files are created or moved into it. For all parents of it we just care if | |
712 | * they are removed or renamed. */ | |
713 | ||
714 | if (!GREEDY_REALLOC(new_watches, n_allocated, n + 1)) { | |
715 | r = -ENOMEM; | |
716 | goto fail; | |
717 | } | |
718 | ||
719 | /* Start with the top-level directory, which is a bit simpler than the rest, since it can't be a symlink, and | |
720 | * always exists */ | |
721 | wd = inotify_add_watch(b->inotify_fd, "/", IN_CREATE|IN_MOVED_TO); | |
722 | if (wd < 0) { | |
723 | r = log_debug_errno(errno, "Failed to add inotify watch on /: %m"); | |
724 | goto fail; | |
725 | } else | |
726 | new_watches[n++] = wd; | |
727 | ||
728 | for (;;) { | |
729 | _cleanup_free_ char *component = NULL, *prefix = NULL, *destination = NULL; | |
730 | size_t n_slashes, n_component; | |
731 | char *c = NULL; | |
732 | ||
733 | n_slashes = strspn(absolute + done, "/"); | |
734 | n_component = n_slashes + strcspn(absolute + done + n_slashes, "/"); | |
735 | ||
736 | if (n_component == 0) /* The end */ | |
737 | break; | |
738 | ||
739 | component = strndup(absolute + done, n_component); | |
740 | if (!component) { | |
741 | r = -ENOMEM; | |
742 | goto fail; | |
743 | } | |
744 | ||
745 | /* A trailing slash? That's a directory, and not a socket then */ | |
746 | if (path_equal(component, "/")) { | |
747 | r = -EISDIR; | |
748 | goto fail; | |
749 | } | |
750 | ||
751 | /* A single dot? Let's eat this up */ | |
752 | if (path_equal(component, "/.")) { | |
753 | done += n_component; | |
754 | continue; | |
755 | } | |
756 | ||
757 | prefix = strndup(absolute, done + n_component); | |
758 | if (!prefix) { | |
759 | r = -ENOMEM; | |
760 | goto fail; | |
761 | } | |
762 | ||
763 | if (!GREEDY_REALLOC(new_watches, n_allocated, n + 1)) { | |
764 | r = -ENOMEM; | |
765 | goto fail; | |
766 | } | |
767 | ||
768 | wd = inotify_add_watch(b->inotify_fd, prefix, IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO|IN_DONT_FOLLOW); | |
769 | log_debug("Added inotify watch for %s on bus %s: %i", prefix, strna(b->description), wd); | |
770 | ||
771 | if (wd < 0) { | |
772 | if (IN_SET(errno, ENOENT, ELOOP)) | |
773 | break; /* This component doesn't exist yet, or the path contains a cyclic symlink right now */ | |
774 | ||
945403e6 | 775 | r = log_debug_errno(errno, "Failed to add inotify watch on %s: %m", empty_to_root(prefix)); |
8a5cd31e LP |
776 | goto fail; |
777 | } else | |
778 | new_watches[n++] = wd; | |
779 | ||
780 | /* Check if this is possibly a symlink. If so, let's follow it and watch it too. */ | |
781 | r = readlink_malloc(prefix, &destination); | |
782 | if (r == -EINVAL) { /* not a symlink */ | |
783 | done += n_component; | |
784 | continue; | |
785 | } | |
786 | if (r < 0) | |
787 | goto fail; | |
788 | ||
789 | if (isempty(destination)) { /* Empty symlink target? Yuck! */ | |
790 | r = -EINVAL; | |
791 | goto fail; | |
792 | } | |
793 | ||
794 | if (max_follow <= 0) { /* Let's make sure we don't follow symlinks forever */ | |
795 | r = -ELOOP; | |
796 | goto fail; | |
797 | } | |
798 | ||
799 | if (path_is_absolute(destination)) { | |
800 | /* For absolute symlinks we build the new path and start anew */ | |
801 | c = strjoin(destination, absolute + done + n_component); | |
802 | done = 0; | |
803 | } else { | |
804 | _cleanup_free_ char *t = NULL; | |
805 | ||
806 | /* For relative symlinks we replace the last component, and try again */ | |
807 | t = strndup(absolute, done); | |
808 | if (!t) | |
809 | return -ENOMEM; | |
810 | ||
811 | c = strjoin(t, "/", destination, absolute + done + n_component); | |
812 | } | |
813 | if (!c) { | |
814 | r = -ENOMEM; | |
815 | goto fail; | |
816 | } | |
817 | ||
818 | free(absolute); | |
819 | absolute = c; | |
820 | ||
821 | max_follow--; | |
822 | } | |
823 | ||
824 | /* And now, let's remove all watches from the previous iteration we don't need anymore */ | |
825 | for (i = 0; i < b->n_inotify_watches; i++) { | |
826 | bool found = false; | |
827 | size_t j; | |
828 | ||
829 | for (j = 0; j < n; j++) | |
830 | if (new_watches[j] == b->inotify_watches[i]) { | |
831 | found = true; | |
832 | break; | |
833 | } | |
834 | ||
835 | if (found) | |
836 | continue; | |
837 | ||
838 | (void) inotify_rm_watch(b->inotify_fd, b->inotify_watches[i]); | |
839 | } | |
840 | ||
841 | free_and_replace(b->inotify_watches, new_watches); | |
842 | b->n_inotify_watches = n; | |
843 | ||
844 | return 0; | |
845 | ||
846 | fail: | |
847 | bus_close_inotify_fd(b); | |
848 | return r; | |
849 | } | |
850 | ||
a7e3212d | 851 | int bus_socket_connect(sd_bus *b) { |
8a5cd31e | 852 | bool inotify_done = false; |
a7e3212d LP |
853 | int r; |
854 | ||
855 | assert(b); | |
a7e3212d | 856 | |
8a5cd31e LP |
857 | for (;;) { |
858 | assert(b->input_fd < 0); | |
859 | assert(b->output_fd < 0); | |
860 | assert(b->sockaddr.sa.sa_family != AF_UNSPEC); | |
a7e3212d | 861 | |
8a5cd31e LP |
862 | b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
863 | if (b->input_fd < 0) | |
864 | return -errno; | |
e82c9509 | 865 | |
7fe2903c LP |
866 | b->input_fd = fd_move_above_stdio(b->input_fd); |
867 | ||
8a5cd31e LP |
868 | b->output_fd = b->input_fd; |
869 | bus_socket_setup(b); | |
a7e3212d | 870 | |
8a5cd31e LP |
871 | if (connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size) < 0) { |
872 | if (errno == EINPROGRESS) { | |
a7e3212d | 873 | |
8a5cd31e LP |
874 | /* If we have any inotify watches open, close them now, we don't need them anymore, as |
875 | * we have successfully initiated a connection */ | |
876 | bus_close_inotify_fd(b); | |
877 | ||
878 | /* Note that very likely we are already in BUS_OPENING state here, as we enter it when | |
879 | * we start parsing the address string. The only reason we set the state explicitly | |
880 | * here, is to undo BUS_WATCH_BIND, in case we did the inotify magic. */ | |
3e0e196e | 881 | bus_set_state(b, BUS_OPENING); |
8a5cd31e LP |
882 | return 1; |
883 | } | |
884 | ||
885 | if (IN_SET(errno, ENOENT, ECONNREFUSED) && /* ENOENT → unix socket doesn't exist at all; ECONNREFUSED → unix socket stale */ | |
886 | b->watch_bind && | |
887 | b->sockaddr.sa.sa_family == AF_UNIX && | |
888 | b->sockaddr.un.sun_path[0] != 0) { | |
889 | ||
890 | /* This connection attempt failed, let's release the socket for now, and start with a | |
891 | * fresh one when reconnecting. */ | |
892 | bus_close_io_fds(b); | |
893 | ||
894 | if (inotify_done) { | |
895 | /* inotify set up already, don't do it again, just return now, and remember | |
896 | * that we are waiting for inotify events now. */ | |
3e0e196e | 897 | bus_set_state(b, BUS_WATCH_BIND); |
8a5cd31e LP |
898 | return 1; |
899 | } | |
900 | ||
901 | /* This is a file system socket, and the inotify logic is enabled. Let's create the necessary inotify fd. */ | |
902 | r = bus_socket_inotify_setup(b); | |
903 | if (r < 0) | |
904 | return r; | |
905 | ||
906 | /* Let's now try to connect a second time, because in theory there's otherwise a race | |
907 | * here: the socket might have been created in the time between our first connect() and | |
908 | * the time we set up the inotify logic. But let's remember that we set up inotify now, | |
909 | * so that we don't do the connect() more than twice. */ | |
910 | inotify_done = true; | |
911 | ||
912 | } else | |
913 | return -errno; | |
914 | } else | |
915 | break; | |
a7e3212d LP |
916 | } |
917 | ||
8a5cd31e LP |
918 | /* Yay, established, we don't need no inotify anymore! */ |
919 | bus_close_inotify_fd(b); | |
920 | ||
a7e3212d LP |
921 | return bus_socket_start_auth(b); |
922 | } | |
923 | ||
924 | int bus_socket_exec(sd_bus *b) { | |
e82c9509 | 925 | int s[2], r; |
a7e3212d LP |
926 | |
927 | assert(b); | |
e82c9509 LP |
928 | assert(b->input_fd < 0); |
929 | assert(b->output_fd < 0); | |
a7e3212d | 930 | assert(b->exec_path); |
392cf1d0 | 931 | assert(b->busexec_pid == 0); |
a7e3212d | 932 | |
e82c9509 LP |
933 | r = socketpair(AF_UNIX, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, s); |
934 | if (r < 0) | |
a7e3212d LP |
935 | return -errno; |
936 | ||
392cf1d0 | 937 | r = safe_fork_full("(sd-busexec)", s+1, 1, FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS, &b->busexec_pid); |
4c253ed1 | 938 | if (r < 0) { |
3d94f76c | 939 | safe_close_pair(s); |
4c253ed1 | 940 | return r; |
a7e3212d | 941 | } |
4c253ed1 | 942 | if (r == 0) { |
a7e3212d LP |
943 | /* Child */ |
944 | ||
2b33ab09 LP |
945 | if (rearrange_stdio(s[1], s[1], STDERR_FILENO) < 0) |
946 | _exit(EXIT_FAILURE); | |
a7e3212d | 947 | |
a7e3212d LP |
948 | if (b->exec_argv) |
949 | execvp(b->exec_path, b->exec_argv); | |
950 | else { | |
951 | const char *argv[] = { b->exec_path, NULL }; | |
952 | execvp(b->exec_path, (char**) argv); | |
953 | } | |
954 | ||
955 | _exit(EXIT_FAILURE); | |
956 | } | |
957 | ||
03e334a1 | 958 | safe_close(s[1]); |
7fe2903c | 959 | b->output_fd = b->input_fd = fd_move_above_stdio(s[0]); |
a7e3212d | 960 | |
8f04d2eb | 961 | bus_socket_setup(b); |
e1d337d4 | 962 | |
a7e3212d LP |
963 | return bus_socket_start_auth(b); |
964 | } | |
965 | ||
966 | int bus_socket_take_fd(sd_bus *b) { | |
a7e3212d LP |
967 | assert(b); |
968 | ||
8f04d2eb | 969 | bus_socket_setup(b); |
a7e3212d LP |
970 | |
971 | return bus_socket_start_auth(b); | |
972 | } | |
973 | ||
974 | int bus_socket_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) { | |
a7e3212d LP |
975 | struct iovec *iov; |
976 | ssize_t k; | |
977 | size_t n; | |
978 | unsigned j; | |
bc7fd8cd | 979 | int r; |
a7e3212d LP |
980 | |
981 | assert(bus); | |
982 | assert(m); | |
983 | assert(idx); | |
945c2931 | 984 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 985 | |
6629161f | 986 | if (*idx >= BUS_MESSAGE_SIZE(m)) |
a7e3212d | 987 | return 0; |
a7e3212d | 988 | |
bc7fd8cd LP |
989 | r = bus_message_setup_iovec(m); |
990 | if (r < 0) | |
991 | return r; | |
2100fa10 | 992 | |
a7e3212d LP |
993 | n = m->n_iovec * sizeof(struct iovec); |
994 | iov = alloca(n); | |
75f32f04 | 995 | memcpy_safe(iov, m->iovec, n); |
a7e3212d LP |
996 | |
997 | j = 0; | |
998 | iovec_advance(iov, &j, *idx); | |
999 | ||
15d5af81 LP |
1000 | if (bus->prefer_writev) |
1001 | k = writev(bus->output_fd, iov, m->n_iovec); | |
1002 | else { | |
7f4e6a1c ZJS |
1003 | struct msghdr mh = { |
1004 | .msg_iov = iov, | |
1005 | .msg_iovlen = m->n_iovec, | |
1006 | }; | |
15d5af81 | 1007 | |
f29eef2e | 1008 | if (m->n_fds > 0 && *idx == 0) { |
15d5af81 | 1009 | struct cmsghdr *control; |
15d5af81 | 1010 | |
7f4e6a1c ZJS |
1011 | mh.msg_control = control = alloca(CMSG_SPACE(sizeof(int) * m->n_fds)); |
1012 | mh.msg_controllen = control->cmsg_len = CMSG_LEN(sizeof(int) * m->n_fds); | |
15d5af81 LP |
1013 | control->cmsg_level = SOL_SOCKET; |
1014 | control->cmsg_type = SCM_RIGHTS; | |
15d5af81 LP |
1015 | memcpy(CMSG_DATA(control), m->fds, sizeof(int) * m->n_fds); |
1016 | } | |
1017 | ||
15d5af81 LP |
1018 | k = sendmsg(bus->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); |
1019 | if (k < 0 && errno == ENOTSOCK) { | |
1020 | bus->prefer_writev = true; | |
1021 | k = writev(bus->output_fd, iov, m->n_iovec); | |
1022 | } | |
1023 | } | |
a7e3212d | 1024 | |
a7e3212d LP |
1025 | if (k < 0) |
1026 | return errno == EAGAIN ? 0 : -errno; | |
1027 | ||
1028 | *idx += (size_t) k; | |
1029 | return 1; | |
1030 | } | |
1031 | ||
1032 | static int bus_socket_read_message_need(sd_bus *bus, size_t *need) { | |
1033 | uint32_t a, b; | |
1034 | uint8_t e; | |
1035 | uint64_t sum; | |
1036 | ||
1037 | assert(bus); | |
1038 | assert(need); | |
945c2931 | 1039 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1040 | |
1041 | if (bus->rbuffer_size < sizeof(struct bus_header)) { | |
1042 | *need = sizeof(struct bus_header) + 8; | |
1043 | ||
1044 | /* Minimum message size: | |
1045 | * | |
1046 | * Header + | |
1047 | * | |
1048 | * Method Call: +2 string headers | |
1049 | * Signal: +3 string headers | |
1050 | * Method Error: +1 string headers | |
1051 | * +1 uint32 headers | |
1052 | * Method Reply: +1 uint32 headers | |
1053 | * | |
1054 | * A string header is at least 9 bytes | |
1055 | * A uint32 header is at least 8 bytes | |
1056 | * | |
1057 | * Hence the minimum message size of a valid message | |
1058 | * is header + 8 bytes */ | |
1059 | ||
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | a = ((const uint32_t*) bus->rbuffer)[1]; | |
1064 | b = ((const uint32_t*) bus->rbuffer)[3]; | |
1065 | ||
1066 | e = ((const uint8_t*) bus->rbuffer)[0]; | |
0461f8cd | 1067 | if (e == BUS_LITTLE_ENDIAN) { |
a7e3212d LP |
1068 | a = le32toh(a); |
1069 | b = le32toh(b); | |
0461f8cd | 1070 | } else if (e == BUS_BIG_ENDIAN) { |
a7e3212d LP |
1071 | a = be32toh(a); |
1072 | b = be32toh(b); | |
1073 | } else | |
1074 | return -EBADMSG; | |
1075 | ||
1076 | sum = (uint64_t) sizeof(struct bus_header) + (uint64_t) ALIGN_TO(b, 8) + (uint64_t) a; | |
1077 | if (sum >= BUS_MESSAGE_SIZE_MAX) | |
1078 | return -ENOBUFS; | |
1079 | ||
1080 | *need = (size_t) sum; | |
1081 | return 0; | |
1082 | } | |
1083 | ||
7d22c717 | 1084 | static int bus_socket_make_message(sd_bus *bus, size_t size) { |
a7e3212d LP |
1085 | sd_bus_message *t; |
1086 | void *b; | |
1087 | int r; | |
1088 | ||
1089 | assert(bus); | |
a7e3212d | 1090 | assert(bus->rbuffer_size >= size); |
945c2931 | 1091 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 1092 | |
7adc46fc LP |
1093 | r = bus_rqueue_make_room(bus); |
1094 | if (r < 0) | |
1095 | return r; | |
1096 | ||
a7e3212d LP |
1097 | if (bus->rbuffer_size > size) { |
1098 | b = memdup((const uint8_t*) bus->rbuffer + size, | |
1099 | bus->rbuffer_size - size); | |
1100 | if (!b) | |
1101 | return -ENOMEM; | |
1102 | } else | |
1103 | b = NULL; | |
1104 | ||
df2d202e LP |
1105 | r = bus_message_from_malloc(bus, |
1106 | bus->rbuffer, size, | |
a7e3212d | 1107 | bus->fds, bus->n_fds, |
038f9863 | 1108 | NULL, |
a7e3212d LP |
1109 | &t); |
1110 | if (r < 0) { | |
1111 | free(b); | |
1112 | return r; | |
1113 | } | |
1114 | ||
1115 | bus->rbuffer = b; | |
1116 | bus->rbuffer_size -= size; | |
1117 | ||
1118 | bus->fds = NULL; | |
1119 | bus->n_fds = 0; | |
1120 | ||
7adc46fc | 1121 | bus->rqueue[bus->rqueue_size++] = t; |
7d22c717 | 1122 | |
a7e3212d LP |
1123 | return 1; |
1124 | } | |
1125 | ||
7d22c717 | 1126 | int bus_socket_read_message(sd_bus *bus) { |
a7e3212d | 1127 | struct msghdr mh; |
7f4e6a1c | 1128 | struct iovec iov = {}; |
a7e3212d LP |
1129 | ssize_t k; |
1130 | size_t need; | |
1131 | int r; | |
1132 | void *b; | |
1133 | union { | |
1134 | struct cmsghdr cmsghdr; | |
d868f2a3 | 1135 | uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; |
a7e3212d | 1136 | } control; |
4d3a5b10 | 1137 | bool handle_cmsg = false; |
a7e3212d LP |
1138 | |
1139 | assert(bus); | |
945c2931 | 1140 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1141 | |
1142 | r = bus_socket_read_message_need(bus, &need); | |
1143 | if (r < 0) | |
1144 | return r; | |
1145 | ||
1146 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1147 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1148 | |
1149 | b = realloc(bus->rbuffer, need); | |
1150 | if (!b) | |
1151 | return -ENOMEM; | |
1152 | ||
1153 | bus->rbuffer = b; | |
1154 | ||
a7e3212d LP |
1155 | iov.iov_base = (uint8_t*) bus->rbuffer + bus->rbuffer_size; |
1156 | iov.iov_len = need - bus->rbuffer_size; | |
1157 | ||
15d5af81 LP |
1158 | if (bus->prefer_readv) |
1159 | k = readv(bus->input_fd, &iov, 1); | |
1160 | else { | |
1161 | zero(mh); | |
1162 | mh.msg_iov = &iov; | |
1163 | mh.msg_iovlen = 1; | |
1164 | mh.msg_control = &control; | |
1165 | mh.msg_controllen = sizeof(control); | |
1166 | ||
1167 | k = recvmsg(bus->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); | |
1168 | if (k < 0 && errno == ENOTSOCK) { | |
1169 | bus->prefer_readv = true; | |
1170 | k = readv(bus->input_fd, &iov, 1); | |
1171 | } else | |
1172 | handle_cmsg = true; | |
1173 | } | |
a7e3212d LP |
1174 | if (k < 0) |
1175 | return errno == EAGAIN ? 0 : -errno; | |
1176 | if (k == 0) | |
1177 | return -ECONNRESET; | |
1178 | ||
1179 | bus->rbuffer_size += k; | |
1180 | ||
2a1288ff LP |
1181 | if (handle_cmsg) { |
1182 | struct cmsghdr *cmsg; | |
1183 | ||
1184 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
1185 | if (cmsg->cmsg_level == SOL_SOCKET && |
1186 | cmsg->cmsg_type == SCM_RIGHTS) { | |
7fe2903c | 1187 | int n, *f, i; |
15d5af81 LP |
1188 | |
1189 | n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
1190 | ||
1191 | if (!bus->can_fds) { | |
1192 | /* Whut? We received fds but this | |
1193 | * isn't actually enabled? Close them, | |
1194 | * and fail */ | |
1195 | ||
1196 | close_many((int*) CMSG_DATA(cmsg), n); | |
1197 | return -EIO; | |
1198 | } | |
1199 | ||
62d74c78 | 1200 | f = reallocarray(bus->fds, bus->n_fds + n, sizeof(int)); |
15d5af81 LP |
1201 | if (!f) { |
1202 | close_many((int*) CMSG_DATA(cmsg), n); | |
1203 | return -ENOMEM; | |
1204 | } | |
1205 | ||
7fe2903c LP |
1206 | for (i = 0; i < n; i++) |
1207 | f[bus->n_fds++] = fd_move_above_stdio(((int*) CMSG_DATA(cmsg))[i]); | |
15d5af81 | 1208 | bus->fds = f; |
d868f2a3 ZJS |
1209 | } else |
1210 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
1211 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 1212 | } |
a7e3212d LP |
1213 | |
1214 | r = bus_socket_read_message_need(bus, &need); | |
1215 | if (r < 0) | |
1216 | return r; | |
1217 | ||
1218 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1219 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1220 | |
1221 | return 1; | |
1222 | } | |
1223 | ||
1224 | int bus_socket_process_opening(sd_bus *b) { | |
1225 | int error = 0; | |
1226 | socklen_t slen = sizeof(error); | |
b92bea5d ZJS |
1227 | struct pollfd p = { |
1228 | .fd = b->output_fd, | |
1229 | .events = POLLOUT, | |
1230 | }; | |
a7e3212d LP |
1231 | int r; |
1232 | ||
a7e3212d LP |
1233 | assert(b->state == BUS_OPENING); |
1234 | ||
a7e3212d LP |
1235 | r = poll(&p, 1, 0); |
1236 | if (r < 0) | |
1237 | return -errno; | |
1238 | ||
1239 | if (!(p.revents & (POLLOUT|POLLERR|POLLHUP))) | |
1240 | return 0; | |
1241 | ||
e82c9509 | 1242 | r = getsockopt(b->output_fd, SOL_SOCKET, SO_ERROR, &error, &slen); |
a7e3212d LP |
1243 | if (r < 0) |
1244 | b->last_connect_error = errno; | |
1245 | else if (error != 0) | |
1246 | b->last_connect_error = error; | |
1247 | else if (p.revents & (POLLERR|POLLHUP)) | |
1248 | b->last_connect_error = ECONNREFUSED; | |
1249 | else | |
1250 | return bus_socket_start_auth(b); | |
1251 | ||
1252 | return bus_next_address(b); | |
1253 | } | |
1254 | ||
1255 | int bus_socket_process_authenticating(sd_bus *b) { | |
1256 | int r; | |
1257 | ||
1258 | assert(b); | |
1259 | assert(b->state == BUS_AUTHENTICATING); | |
1260 | ||
1261 | if (now(CLOCK_MONOTONIC) >= b->auth_timeout) | |
1262 | return -ETIMEDOUT; | |
1263 | ||
1264 | r = bus_socket_write_auth(b); | |
1265 | if (r != 0) | |
1266 | return r; | |
1267 | ||
1268 | return bus_socket_read_auth(b); | |
1269 | } | |
8a5cd31e LP |
1270 | |
1271 | int bus_socket_process_watch_bind(sd_bus *b) { | |
1272 | int r, q; | |
1273 | ||
1274 | assert(b); | |
1275 | assert(b->state == BUS_WATCH_BIND); | |
1276 | assert(b->inotify_fd >= 0); | |
1277 | ||
1278 | r = flush_fd(b->inotify_fd); | |
1279 | if (r <= 0) | |
1280 | return r; | |
1281 | ||
1282 | log_debug("Got inotify event on bus %s.", strna(b->description)); | |
1283 | ||
1284 | /* We flushed events out of the inotify fd. In that case, maybe the socket is valid now? Let's try to connect | |
1285 | * to it again */ | |
1286 | ||
1287 | r = bus_socket_connect(b); | |
1288 | if (r < 0) | |
1289 | return r; | |
1290 | ||
1291 | q = bus_attach_io_events(b); | |
1292 | if (q < 0) | |
1293 | return q; | |
1294 | ||
1295 | q = bus_attach_inotify_event(b); | |
1296 | if (q < 0) | |
1297 | return q; | |
1298 | ||
1299 | return r; | |
1300 | } |