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