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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
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 | 20 | #include "macro.h" |
0a970718 | 21 | #include "memory-util.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 | 30 | #include "utf8.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 { | |
41ab8c67 LP |
139 | struct msghdr mh = { |
140 | .msg_iov = b->auth_iovec + b->auth_index, | |
141 | .msg_iovlen = ELEMENTSOF(b->auth_iovec) - b->auth_index, | |
142 | }; | |
15d5af81 LP |
143 | |
144 | k = sendmsg(b->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
145 | if (k < 0 && errno == ENOTSOCK) { | |
146 | b->prefer_writev = true; | |
147 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
148 | } | |
149 | } | |
a7e3212d | 150 | |
a7e3212d LP |
151 | if (k < 0) |
152 | return errno == EAGAIN ? 0 : -errno; | |
153 | ||
154 | iovec_advance(b->auth_iovec, &b->auth_index, (size_t) k); | |
a7e3212d LP |
155 | return 1; |
156 | } | |
157 | ||
2181a7f5 | 158 | static int bus_socket_auth_verify_client(sd_bus *b) { |
1ed4723d | 159 | char *d, *e, *f, *start; |
a7e3212d | 160 | sd_id128_t peer; |
a7e3212d LP |
161 | int r; |
162 | ||
2181a7f5 LP |
163 | assert(b); |
164 | ||
1ed4723d DR |
165 | /* |
166 | * We expect three response lines: | |
167 | * "DATA\r\n" | |
168 | * "OK <server-id>\r\n" | |
169 | * "AGREE_UNIX_FD\r\n" (optional) | |
170 | */ | |
a7e3212d | 171 | |
1ed4723d DR |
172 | d = memmem_safe(b->rbuffer, b->rbuffer_size, "\r\n", 2); |
173 | if (!d) | |
174 | return 0; | |
175 | ||
176 | e = memmem(d + 2, b->rbuffer_size - (d - (char*) b->rbuffer) - 2, "\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 | ||
1ed4723d DR |
191 | /* Nice! We got all the lines we need. First check the DATA line. */ |
192 | ||
193 | if (d - (char*) b->rbuffer == 4) { | |
194 | if (memcmp(b->rbuffer, "DATA", 4)) | |
195 | return -EPERM; | |
196 | } else if (d - (char*) b->rbuffer == 3 + 32) { | |
197 | /* | |
198 | * Old versions of the server-side implementation of `sd-bus` replied with "OK <id>" to | |
199 | * "AUTH" requests from a client, even if the "AUTH" line did not contain inlined | |
200 | * arguments. Therefore, we also accept "OK <id>" here, even though it is technically the | |
201 | * wrong reply. We ignore the "<id>" parameter, though, since it has no real value. | |
202 | */ | |
203 | if (memcmp(b->rbuffer, "OK ", 3)) | |
204 | return -EPERM; | |
afd5c1e3 | 205 | } else |
1ed4723d | 206 | return -EPERM; |
a7e3212d | 207 | |
1ed4723d DR |
208 | /* Now check the OK line. */ |
209 | ||
210 | if (e - d != 2 + 3 + 32) | |
a7e3212d LP |
211 | return -EPERM; |
212 | ||
1ed4723d | 213 | if (memcmp(d + 2, "OK ", 3)) |
a7e3212d LP |
214 | return -EPERM; |
215 | ||
2181a7f5 LP |
216 | b->auth = b->anonymous_auth ? BUS_AUTH_ANONYMOUS : BUS_AUTH_EXTERNAL; |
217 | ||
afd5c1e3 | 218 | for (unsigned i = 0; i < 32; i += 2) { |
a7e3212d LP |
219 | int x, y; |
220 | ||
1ed4723d DR |
221 | x = unhexchar(d[2 + 3 + i]); |
222 | y = unhexchar(d[2 + 3 + i + 1]); | |
a7e3212d LP |
223 | |
224 | if (x < 0 || y < 0) | |
225 | return -EINVAL; | |
226 | ||
227 | peer.bytes[i/2] = ((uint8_t) x << 4 | (uint8_t) y); | |
228 | } | |
229 | ||
3bbaff3e | 230 | if (!sd_id128_is_null(b->server_id) && |
98178d39 | 231 | !sd_id128_equal(b->server_id, peer)) |
a7e3212d LP |
232 | return -EPERM; |
233 | ||
98178d39 | 234 | b->server_id = peer; |
a7e3212d | 235 | |
1ed4723d | 236 | /* And possibly check the third line, too */ |
a7e3212d LP |
237 | |
238 | if (f) | |
239 | b->can_fds = | |
fbd0b64f LP |
240 | (f - e == STRLEN("\r\nAGREE_UNIX_FD")) && |
241 | memcmp(e + 2, "AGREE_UNIX_FD", | |
242 | STRLEN("AGREE_UNIX_FD")) == 0; | |
a7e3212d LP |
243 | |
244 | b->rbuffer_size -= (start - (char*) b->rbuffer); | |
245 | memmove(b->rbuffer, start, b->rbuffer_size); | |
246 | ||
247 | r = bus_start_running(b); | |
248 | if (r < 0) | |
249 | return r; | |
250 | ||
251 | return 1; | |
252 | } | |
253 | ||
2181a7f5 LP |
254 | static bool line_equals(const char *s, size_t m, const char *line) { |
255 | size_t l; | |
256 | ||
257 | l = strlen(line); | |
258 | if (l != m) | |
259 | return false; | |
260 | ||
261 | return memcmp(s, line, l) == 0; | |
262 | } | |
263 | ||
264 | static bool line_begins(const char *s, size_t m, const char *word) { | |
d27b725a | 265 | const char *p; |
2181a7f5 | 266 | |
d27b725a | 267 | p = memory_startswith(s, m, word); |
3f10c662 | 268 | return p && (p == (s + m) || *p == ' '); |
2181a7f5 LP |
269 | } |
270 | ||
271 | static int verify_anonymous_token(sd_bus *b, const char *p, size_t l) { | |
272 | _cleanup_free_ char *token = NULL; | |
30494563 TG |
273 | size_t len; |
274 | int r; | |
2181a7f5 LP |
275 | |
276 | if (!b->anonymous_auth) | |
277 | return 0; | |
278 | ||
279 | if (l <= 0) | |
280 | return 1; | |
281 | ||
282 | assert(p[0] == ' '); | |
283 | p++; l--; | |
284 | ||
285 | if (l % 2 != 0) | |
286 | return 0; | |
2181a7f5 | 287 | |
30494563 TG |
288 | r = unhexmem(p, l, (void **) &token, &len); |
289 | if (r < 0) | |
290 | return 0; | |
291 | ||
292 | if (memchr(token, 0, len)) | |
2181a7f5 LP |
293 | return 0; |
294 | ||
295 | return !!utf8_is_valid(token); | |
296 | } | |
297 | ||
298 | static int verify_external_token(sd_bus *b, const char *p, size_t l) { | |
299 | _cleanup_free_ char *token = NULL; | |
30494563 | 300 | size_t len; |
2181a7f5 LP |
301 | uid_t u; |
302 | int r; | |
303 | ||
304 | /* We don't do any real authentication here. Instead, we if | |
305 | * the owner of this bus wanted authentication he should have | |
306 | * checked SO_PEERCRED before even creating the bus object. */ | |
307 | ||
8411d2a2 | 308 | if (!b->anonymous_auth && !b->ucred_valid) |
2181a7f5 LP |
309 | return 0; |
310 | ||
311 | if (l <= 0) | |
312 | return 1; | |
313 | ||
314 | assert(p[0] == ' '); | |
315 | p++; l--; | |
316 | ||
317 | if (l % 2 != 0) | |
318 | return 0; | |
319 | ||
30494563 TG |
320 | r = unhexmem(p, l, (void**) &token, &len); |
321 | if (r < 0) | |
322 | return 0; | |
2181a7f5 | 323 | |
30494563 | 324 | if (memchr(token, 0, len)) |
2181a7f5 LP |
325 | return 0; |
326 | ||
327 | r = parse_uid(token, &u); | |
328 | if (r < 0) | |
329 | return 0; | |
330 | ||
8411d2a2 LP |
331 | /* We ignore the passed value if anonymous authentication is |
332 | * on anyway. */ | |
333 | if (!b->anonymous_auth && u != b->ucred.uid) | |
2181a7f5 LP |
334 | return 0; |
335 | ||
336 | return 1; | |
337 | } | |
338 | ||
339 | static int bus_socket_auth_write(sd_bus *b, const char *t) { | |
340 | char *p; | |
341 | size_t l; | |
342 | ||
343 | assert(b); | |
344 | assert(t); | |
345 | ||
346 | /* We only make use of the first iovec */ | |
945c2931 | 347 | assert(IN_SET(b->auth_index, 0, 1)); |
2181a7f5 LP |
348 | |
349 | l = strlen(t); | |
350 | p = malloc(b->auth_iovec[0].iov_len + l); | |
351 | if (!p) | |
352 | return -ENOMEM; | |
353 | ||
75f32f04 | 354 | memcpy_safe(p, b->auth_iovec[0].iov_base, b->auth_iovec[0].iov_len); |
2181a7f5 LP |
355 | memcpy(p + b->auth_iovec[0].iov_len, t, l); |
356 | ||
357 | b->auth_iovec[0].iov_base = p; | |
358 | b->auth_iovec[0].iov_len += l; | |
359 | ||
360 | free(b->auth_buffer); | |
361 | b->auth_buffer = p; | |
362 | b->auth_index = 0; | |
363 | return 0; | |
364 | } | |
365 | ||
366 | static int bus_socket_auth_write_ok(sd_bus *b) { | |
367 | char t[3 + 32 + 2 + 1]; | |
368 | ||
369 | assert(b); | |
370 | ||
5ffa8c81 | 371 | xsprintf(t, "OK " SD_ID128_FORMAT_STR "\r\n", SD_ID128_FORMAT_VAL(b->server_id)); |
2181a7f5 LP |
372 | |
373 | return bus_socket_auth_write(b, t); | |
374 | } | |
375 | ||
376 | static int bus_socket_auth_verify_server(sd_bus *b) { | |
377 | char *e; | |
378 | const char *line; | |
379 | size_t l; | |
380 | bool processed = false; | |
381 | int r; | |
382 | ||
383 | assert(b); | |
384 | ||
2b4ac889 | 385 | if (b->rbuffer_size < 1) |
2181a7f5 LP |
386 | return 0; |
387 | ||
388 | /* First char must be a NUL byte */ | |
389 | if (*(char*) b->rbuffer != 0) | |
390 | return -EIO; | |
391 | ||
2b4ac889 LP |
392 | if (b->rbuffer_size < 3) |
393 | return 0; | |
394 | ||
2181a7f5 LP |
395 | /* Begin with the first line */ |
396 | if (b->auth_rbegin <= 0) | |
397 | b->auth_rbegin = 1; | |
398 | ||
399 | for (;;) { | |
400 | /* Check if line is complete */ | |
401 | line = (char*) b->rbuffer + b->auth_rbegin; | |
402 | e = memmem(line, b->rbuffer_size - b->auth_rbegin, "\r\n", 2); | |
403 | if (!e) | |
404 | return processed; | |
405 | ||
406 | l = e - line; | |
407 | ||
408 | if (line_begins(line, l, "AUTH ANONYMOUS")) { | |
409 | ||
3cacdab9 DR |
410 | r = verify_anonymous_token(b, |
411 | line + strlen("AUTH ANONYMOUS"), | |
412 | l - strlen("AUTH ANONYMOUS")); | |
2181a7f5 LP |
413 | if (r < 0) |
414 | return r; | |
415 | if (r == 0) | |
416 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
417 | else { | |
418 | b->auth = BUS_AUTH_ANONYMOUS; | |
2010873b DR |
419 | if (l <= strlen("AUTH ANONYMOUS")) |
420 | r = bus_socket_auth_write(b, "DATA\r\n"); | |
421 | else | |
422 | r = bus_socket_auth_write_ok(b); | |
2181a7f5 LP |
423 | } |
424 | ||
425 | } else if (line_begins(line, l, "AUTH EXTERNAL")) { | |
426 | ||
3cacdab9 DR |
427 | r = verify_external_token(b, |
428 | line + strlen("AUTH EXTERNAL"), | |
429 | l - strlen("AUTH EXTERNAL")); | |
2181a7f5 LP |
430 | if (r < 0) |
431 | return r; | |
432 | if (r == 0) | |
433 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
434 | else { | |
435 | b->auth = BUS_AUTH_EXTERNAL; | |
2010873b DR |
436 | if (l <= strlen("AUTH EXTERNAL")) |
437 | r = bus_socket_auth_write(b, "DATA\r\n"); | |
438 | else | |
439 | r = bus_socket_auth_write_ok(b); | |
2181a7f5 LP |
440 | } |
441 | ||
442 | } else if (line_begins(line, l, "AUTH")) | |
443 | r = bus_socket_auth_write(b, "REJECTED EXTERNAL ANONYMOUS\r\n"); | |
444 | else if (line_equals(line, l, "CANCEL") || | |
445 | line_begins(line, l, "ERROR")) { | |
446 | ||
447 | b->auth = _BUS_AUTH_INVALID; | |
448 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
449 | ||
450 | } else if (line_equals(line, l, "BEGIN")) { | |
451 | ||
452 | if (b->auth == _BUS_AUTH_INVALID) | |
453 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
454 | else { | |
455 | /* We can't leave from the auth phase | |
456 | * before we haven't written | |
457 | * everything queued, so let's check | |
458 | * that */ | |
459 | ||
460 | if (bus_socket_auth_needs_write(b)) | |
461 | return 1; | |
462 | ||
463 | b->rbuffer_size -= (e + 2 - (char*) b->rbuffer); | |
464 | memmove(b->rbuffer, e + 2, b->rbuffer_size); | |
465 | return bus_start_running(b); | |
466 | } | |
467 | ||
468 | } else if (line_begins(line, l, "DATA")) { | |
469 | ||
470 | if (b->auth == _BUS_AUTH_INVALID) | |
471 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
472 | else { | |
473 | if (b->auth == BUS_AUTH_ANONYMOUS) | |
474 | r = verify_anonymous_token(b, line + 4, l - 4); | |
475 | else | |
476 | r = verify_external_token(b, line + 4, l - 4); | |
477 | ||
478 | if (r < 0) | |
479 | return r; | |
480 | if (r == 0) { | |
481 | b->auth = _BUS_AUTH_INVALID; | |
482 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
483 | } else | |
484 | r = bus_socket_auth_write_ok(b); | |
485 | } | |
486 | } else if (line_equals(line, l, "NEGOTIATE_UNIX_FD")) { | |
c7db1984 | 487 | if (b->auth == _BUS_AUTH_INVALID || !b->accept_fd) |
2181a7f5 LP |
488 | r = bus_socket_auth_write(b, "ERROR\r\n"); |
489 | else { | |
490 | b->can_fds = true; | |
491 | r = bus_socket_auth_write(b, "AGREE_UNIX_FD\r\n"); | |
492 | } | |
493 | } else | |
494 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
495 | ||
496 | if (r < 0) | |
497 | return r; | |
498 | ||
499 | b->auth_rbegin = e + 2 - (char*) b->rbuffer; | |
500 | ||
501 | processed = true; | |
502 | } | |
503 | } | |
504 | ||
505 | static int bus_socket_auth_verify(sd_bus *b) { | |
506 | assert(b); | |
507 | ||
508 | if (b->is_server) | |
509 | return bus_socket_auth_verify_server(b); | |
510 | else | |
511 | return bus_socket_auth_verify_client(b); | |
512 | } | |
513 | ||
a7e3212d LP |
514 | static int bus_socket_read_auth(sd_bus *b) { |
515 | struct msghdr mh; | |
7f4e6a1c | 516 | struct iovec iov = {}; |
a7e3212d LP |
517 | size_t n; |
518 | ssize_t k; | |
519 | int r; | |
520 | void *p; | |
fb29cdbe | 521 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)) control; |
15d5af81 | 522 | bool handle_cmsg = false; |
a7e3212d LP |
523 | |
524 | assert(b); | |
2181a7f5 | 525 | assert(b->state == BUS_AUTHENTICATING); |
a7e3212d LP |
526 | |
527 | r = bus_socket_auth_verify(b); | |
528 | if (r != 0) | |
529 | return r; | |
530 | ||
9607d947 | 531 | n = MAX(256u, b->rbuffer_size * 2); |
a7e3212d LP |
532 | |
533 | if (n > BUS_AUTH_SIZE_MAX) | |
534 | n = BUS_AUTH_SIZE_MAX; | |
535 | ||
536 | if (b->rbuffer_size >= n) | |
537 | return -ENOBUFS; | |
538 | ||
539 | p = realloc(b->rbuffer, n); | |
540 | if (!p) | |
541 | return -ENOMEM; | |
542 | ||
543 | b->rbuffer = p; | |
544 | ||
5cfa2c3d | 545 | iov = IOVEC_MAKE((uint8_t *)b->rbuffer + b->rbuffer_size, n - b->rbuffer_size); |
a7e3212d | 546 | |
c1093c34 | 547 | if (b->prefer_readv) { |
15d5af81 | 548 | k = readv(b->input_fd, &iov, 1); |
c1093c34 LP |
549 | if (k < 0) |
550 | k = -errno; | |
551 | } else { | |
41ab8c67 LP |
552 | mh = (struct msghdr) { |
553 | .msg_iov = &iov, | |
554 | .msg_iovlen = 1, | |
555 | .msg_control = &control, | |
556 | .msg_controllen = sizeof(control), | |
557 | }; | |
15d5af81 | 558 | |
3691bcf3 LP |
559 | k = recvmsg_safe(b->input_fd, &mh, MSG_DONTWAIT|MSG_CMSG_CLOEXEC); |
560 | if (k == -ENOTSOCK) { | |
15d5af81 LP |
561 | b->prefer_readv = true; |
562 | k = readv(b->input_fd, &iov, 1); | |
3691bcf3 LP |
563 | if (k < 0) |
564 | k = -errno; | |
15d5af81 LP |
565 | } else |
566 | handle_cmsg = true; | |
567 | } | |
3691bcf3 LP |
568 | if (k == -EAGAIN) |
569 | return 0; | |
a7e3212d | 570 | if (k < 0) |
3691bcf3 LP |
571 | return (int) k; |
572 | if (k == 0) { | |
573 | if (handle_cmsg) | |
574 | cmsg_close_all(&mh); /* paranoia, we shouldn't have gotten any fds on EOF */ | |
a7e3212d | 575 | return -ECONNRESET; |
3691bcf3 | 576 | } |
a7e3212d LP |
577 | |
578 | b->rbuffer_size += k; | |
579 | ||
2a1288ff LP |
580 | if (handle_cmsg) { |
581 | struct cmsghdr *cmsg; | |
582 | ||
583 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
584 | if (cmsg->cmsg_level == SOL_SOCKET && |
585 | cmsg->cmsg_type == SCM_RIGHTS) { | |
586 | int j; | |
587 | ||
588 | /* Whut? We received fds during the auth | |
589 | * protocol? Somebody is playing games with | |
590 | * us. Close them all, and fail */ | |
591 | j = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
592 | close_many((int*) CMSG_DATA(cmsg), j); | |
593 | return -EIO; | |
d868f2a3 ZJS |
594 | } else |
595 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
596 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 597 | } |
2181a7f5 | 598 | |
a7e3212d LP |
599 | r = bus_socket_auth_verify(b); |
600 | if (r != 0) | |
601 | return r; | |
602 | ||
603 | return 1; | |
604 | } | |
605 | ||
8f04d2eb | 606 | void bus_socket_setup(sd_bus *b) { |
a7e3212d LP |
607 | assert(b); |
608 | ||
aec6d91f | 609 | /* Increase the buffers to 8 MB */ |
6ae22ffb LP |
610 | (void) fd_inc_rcvbuf(b->input_fd, SNDBUF_SIZE); |
611 | (void) fd_inc_sndbuf(b->output_fd, SNDBUF_SIZE); | |
a7e3212d | 612 | |
e1d337d4 | 613 | b->message_version = 1; |
0f437184 | 614 | b->message_endian = 0; |
8f04d2eb | 615 | } |
e1d337d4 | 616 | |
8f04d2eb | 617 | static void bus_get_peercred(sd_bus *b) { |
c4e6556c ZJS |
618 | int r; |
619 | ||
8f04d2eb | 620 | assert(b); |
18ac4643 LP |
621 | assert(!b->ucred_valid); |
622 | assert(!b->label); | |
623 | assert(b->n_groups == (size_t) -1); | |
8f04d2eb LP |
624 | |
625 | /* Get the peer for socketpair() sockets */ | |
eff05270 | 626 | b->ucred_valid = getpeercred(b->input_fd, &b->ucred) >= 0; |
c4e6556c ZJS |
627 | |
628 | /* Get the SELinux context of the peer */ | |
db7d1dca | 629 | r = getpeersec(b->input_fd, &b->label); |
18ac4643 | 630 | if (r < 0 && !IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) |
db7d1dca | 631 | log_debug_errno(r, "Failed to determine peer security context: %m"); |
18ac4643 LP |
632 | |
633 | /* Get the list of auxiliary groups of the peer */ | |
634 | r = getpeergroups(b->input_fd, &b->groups); | |
c599b325 | 635 | if (r >= 0) |
18ac4643 | 636 | b->n_groups = (size_t) r; |
c599b325 ZJS |
637 | else if (!IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) |
638 | log_debug_errno(r, "Failed to determine peer's group list: %m"); | |
a7e3212d LP |
639 | } |
640 | ||
2181a7f5 | 641 | static int bus_socket_start_auth_client(sd_bus *b) { |
1ed4723d DR |
642 | static const char sasl_auth_anonymous[] = { |
643 | /* | |
644 | * We use an arbitrary trace-string for the ANONYMOUS authentication. It can be used by the | |
645 | * message broker to aid debugging of clients. We fully anonymize the connection and use a | |
646 | * static default. | |
647 | */ | |
648 | "\0AUTH ANONYMOUS\r\n" | |
649 | /* HEX a n o n y m o u s */ | |
650 | "DATA 616e6f6e796d6f7573\r\n" | |
651 | }; | |
652 | static const char sasl_auth_external[] = { | |
653 | "\0AUTH EXTERNAL\r\n" | |
654 | "DATA\r\n" | |
655 | }; | |
656 | static const char sasl_negotiate_unix_fd[] = { | |
657 | "NEGOTIATE_UNIX_FD\r\n" | |
658 | }; | |
659 | static const char sasl_begin[] = { | |
660 | "BEGIN\r\n" | |
661 | }; | |
662 | size_t i = 0; | |
a7e3212d LP |
663 | |
664 | assert(b); | |
665 | ||
1ed4723d DR |
666 | if (b->anonymous_auth) |
667 | b->auth_iovec[i++] = IOVEC_MAKE((char*) sasl_auth_anonymous, sizeof(sasl_auth_anonymous) - 1); | |
668 | else | |
669 | b->auth_iovec[i++] = IOVEC_MAKE((char*) sasl_auth_external, sizeof(sasl_auth_external) - 1); | |
a7e3212d | 670 | |
c7db1984 | 671 | if (b->accept_fd) |
1ed4723d | 672 | b->auth_iovec[i++] = IOVEC_MAKE_STRING(sasl_negotiate_unix_fd); |
a7e3212d | 673 | |
1ed4723d | 674 | b->auth_iovec[i++] = IOVEC_MAKE_STRING(sasl_begin); |
a7e3212d LP |
675 | |
676 | return bus_socket_write_auth(b); | |
677 | } | |
678 | ||
a7893c6b | 679 | int bus_socket_start_auth(sd_bus *b) { |
2181a7f5 LP |
680 | assert(b); |
681 | ||
8f04d2eb LP |
682 | bus_get_peercred(b); |
683 | ||
3e0e196e | 684 | bus_set_state(b, BUS_AUTHENTICATING); |
036d61b3 | 685 | b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_AUTH_TIMEOUT; |
2181a7f5 | 686 | |
9ab32f9d | 687 | if (sd_is_socket(b->input_fd, AF_UNIX, 0, 0) <= 0) |
c7db1984 | 688 | b->accept_fd = false; |
2181a7f5 | 689 | |
9ab32f9d LP |
690 | if (b->output_fd != b->input_fd) |
691 | if (sd_is_socket(b->output_fd, AF_UNIX, 0, 0) <= 0) | |
c7db1984 | 692 | b->accept_fd = false; |
e82c9509 | 693 | |
2181a7f5 LP |
694 | if (b->is_server) |
695 | return bus_socket_read_auth(b); | |
696 | else | |
697 | return bus_socket_start_auth_client(b); | |
698 | } | |
699 | ||
8a5cd31e LP |
700 | static int bus_socket_inotify_setup(sd_bus *b) { |
701 | _cleanup_free_ int *new_watches = NULL; | |
702 | _cleanup_free_ char *absolute = NULL; | |
703 | size_t n_allocated = 0, n = 0, done = 0, i; | |
704 | unsigned max_follow = 32; | |
705 | const char *p; | |
706 | int wd, r; | |
707 | ||
708 | assert(b); | |
709 | assert(b->watch_bind); | |
710 | assert(b->sockaddr.sa.sa_family == AF_UNIX); | |
711 | assert(b->sockaddr.un.sun_path[0] != 0); | |
712 | ||
713 | /* Sets up an inotify fd in case watch_bind is enabled: wait until the configured AF_UNIX file system socket | |
714 | * appears before connecting to it. The implemented is pretty simplistic: we just subscribe to relevant changes | |
715 | * to all prefix components of the path, and every time we get an event for that we try to reconnect again, | |
716 | * without actually caring what precisely the event we got told us. If we still can't connect we re-subscribe | |
717 | * to all relevant changes of anything in the path, so that our watches include any possibly newly created path | |
718 | * components. */ | |
719 | ||
720 | if (b->inotify_fd < 0) { | |
721 | b->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
722 | if (b->inotify_fd < 0) | |
723 | return -errno; | |
7fe2903c LP |
724 | |
725 | b->inotify_fd = fd_move_above_stdio(b->inotify_fd); | |
8a5cd31e LP |
726 | } |
727 | ||
728 | /* Make sure the path is NUL terminated */ | |
729 | p = strndupa(b->sockaddr.un.sun_path, sizeof(b->sockaddr.un.sun_path)); | |
730 | ||
731 | /* Make sure the path is absolute */ | |
732 | r = path_make_absolute_cwd(p, &absolute); | |
733 | if (r < 0) | |
734 | goto fail; | |
735 | ||
736 | /* Watch all parent directories, and don't mind any prefix that doesn't exist yet. For the innermost directory | |
737 | * that exists we want to know when files are created or moved into it. For all parents of it we just care if | |
738 | * they are removed or renamed. */ | |
739 | ||
740 | if (!GREEDY_REALLOC(new_watches, n_allocated, n + 1)) { | |
741 | r = -ENOMEM; | |
742 | goto fail; | |
743 | } | |
744 | ||
745 | /* Start with the top-level directory, which is a bit simpler than the rest, since it can't be a symlink, and | |
746 | * always exists */ | |
747 | wd = inotify_add_watch(b->inotify_fd, "/", IN_CREATE|IN_MOVED_TO); | |
748 | if (wd < 0) { | |
749 | r = log_debug_errno(errno, "Failed to add inotify watch on /: %m"); | |
750 | goto fail; | |
751 | } else | |
752 | new_watches[n++] = wd; | |
753 | ||
754 | for (;;) { | |
755 | _cleanup_free_ char *component = NULL, *prefix = NULL, *destination = NULL; | |
756 | size_t n_slashes, n_component; | |
757 | char *c = NULL; | |
758 | ||
759 | n_slashes = strspn(absolute + done, "/"); | |
760 | n_component = n_slashes + strcspn(absolute + done + n_slashes, "/"); | |
761 | ||
762 | if (n_component == 0) /* The end */ | |
763 | break; | |
764 | ||
765 | component = strndup(absolute + done, n_component); | |
766 | if (!component) { | |
767 | r = -ENOMEM; | |
768 | goto fail; | |
769 | } | |
770 | ||
771 | /* A trailing slash? That's a directory, and not a socket then */ | |
772 | if (path_equal(component, "/")) { | |
773 | r = -EISDIR; | |
774 | goto fail; | |
775 | } | |
776 | ||
777 | /* A single dot? Let's eat this up */ | |
778 | if (path_equal(component, "/.")) { | |
779 | done += n_component; | |
780 | continue; | |
781 | } | |
782 | ||
783 | prefix = strndup(absolute, done + n_component); | |
784 | if (!prefix) { | |
785 | r = -ENOMEM; | |
786 | goto fail; | |
787 | } | |
788 | ||
789 | if (!GREEDY_REALLOC(new_watches, n_allocated, n + 1)) { | |
790 | r = -ENOMEM; | |
791 | goto fail; | |
792 | } | |
793 | ||
794 | wd = inotify_add_watch(b->inotify_fd, prefix, IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO|IN_DONT_FOLLOW); | |
795 | log_debug("Added inotify watch for %s on bus %s: %i", prefix, strna(b->description), wd); | |
796 | ||
797 | if (wd < 0) { | |
798 | if (IN_SET(errno, ENOENT, ELOOP)) | |
799 | break; /* This component doesn't exist yet, or the path contains a cyclic symlink right now */ | |
800 | ||
945403e6 | 801 | r = log_debug_errno(errno, "Failed to add inotify watch on %s: %m", empty_to_root(prefix)); |
8a5cd31e LP |
802 | goto fail; |
803 | } else | |
804 | new_watches[n++] = wd; | |
805 | ||
806 | /* Check if this is possibly a symlink. If so, let's follow it and watch it too. */ | |
807 | r = readlink_malloc(prefix, &destination); | |
808 | if (r == -EINVAL) { /* not a symlink */ | |
809 | done += n_component; | |
810 | continue; | |
811 | } | |
812 | if (r < 0) | |
813 | goto fail; | |
814 | ||
815 | if (isempty(destination)) { /* Empty symlink target? Yuck! */ | |
816 | r = -EINVAL; | |
817 | goto fail; | |
818 | } | |
819 | ||
820 | if (max_follow <= 0) { /* Let's make sure we don't follow symlinks forever */ | |
821 | r = -ELOOP; | |
822 | goto fail; | |
823 | } | |
824 | ||
825 | if (path_is_absolute(destination)) { | |
826 | /* For absolute symlinks we build the new path and start anew */ | |
827 | c = strjoin(destination, absolute + done + n_component); | |
828 | done = 0; | |
829 | } else { | |
830 | _cleanup_free_ char *t = NULL; | |
831 | ||
832 | /* For relative symlinks we replace the last component, and try again */ | |
833 | t = strndup(absolute, done); | |
834 | if (!t) | |
835 | return -ENOMEM; | |
836 | ||
837 | c = strjoin(t, "/", destination, absolute + done + n_component); | |
838 | } | |
839 | if (!c) { | |
840 | r = -ENOMEM; | |
841 | goto fail; | |
842 | } | |
843 | ||
844 | free(absolute); | |
845 | absolute = c; | |
846 | ||
847 | max_follow--; | |
848 | } | |
849 | ||
850 | /* And now, let's remove all watches from the previous iteration we don't need anymore */ | |
851 | for (i = 0; i < b->n_inotify_watches; i++) { | |
852 | bool found = false; | |
853 | size_t j; | |
854 | ||
855 | for (j = 0; j < n; j++) | |
856 | if (new_watches[j] == b->inotify_watches[i]) { | |
857 | found = true; | |
858 | break; | |
859 | } | |
860 | ||
861 | if (found) | |
862 | continue; | |
863 | ||
864 | (void) inotify_rm_watch(b->inotify_fd, b->inotify_watches[i]); | |
865 | } | |
866 | ||
867 | free_and_replace(b->inotify_watches, new_watches); | |
868 | b->n_inotify_watches = n; | |
869 | ||
870 | return 0; | |
871 | ||
872 | fail: | |
873 | bus_close_inotify_fd(b); | |
874 | return r; | |
875 | } | |
876 | ||
a7e3212d | 877 | int bus_socket_connect(sd_bus *b) { |
8a5cd31e | 878 | bool inotify_done = false; |
a7e3212d LP |
879 | int r; |
880 | ||
881 | assert(b); | |
a7e3212d | 882 | |
8a5cd31e LP |
883 | for (;;) { |
884 | assert(b->input_fd < 0); | |
885 | assert(b->output_fd < 0); | |
886 | assert(b->sockaddr.sa.sa_family != AF_UNSPEC); | |
a7e3212d | 887 | |
165fee86 ZJS |
888 | if (DEBUG_LOGGING) { |
889 | _cleanup_free_ char *pretty = NULL; | |
890 | (void) sockaddr_pretty(&b->sockaddr.sa, b->sockaddr_size, false, true, &pretty); | |
891 | log_debug("sd-bus: starting bus%s%s by connecting to %s...", | |
892 | b->description ? " " : "", strempty(b->description), strnull(pretty)); | |
893 | } | |
894 | ||
8a5cd31e LP |
895 | b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
896 | if (b->input_fd < 0) | |
897 | return -errno; | |
e82c9509 | 898 | |
7fe2903c LP |
899 | b->input_fd = fd_move_above_stdio(b->input_fd); |
900 | ||
8a5cd31e LP |
901 | b->output_fd = b->input_fd; |
902 | bus_socket_setup(b); | |
a7e3212d | 903 | |
8a5cd31e LP |
904 | if (connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size) < 0) { |
905 | if (errno == EINPROGRESS) { | |
a7e3212d | 906 | |
8a5cd31e LP |
907 | /* If we have any inotify watches open, close them now, we don't need them anymore, as |
908 | * we have successfully initiated a connection */ | |
909 | bus_close_inotify_fd(b); | |
910 | ||
911 | /* Note that very likely we are already in BUS_OPENING state here, as we enter it when | |
912 | * we start parsing the address string. The only reason we set the state explicitly | |
913 | * here, is to undo BUS_WATCH_BIND, in case we did the inotify magic. */ | |
3e0e196e | 914 | bus_set_state(b, BUS_OPENING); |
8a5cd31e LP |
915 | return 1; |
916 | } | |
917 | ||
918 | if (IN_SET(errno, ENOENT, ECONNREFUSED) && /* ENOENT → unix socket doesn't exist at all; ECONNREFUSED → unix socket stale */ | |
919 | b->watch_bind && | |
920 | b->sockaddr.sa.sa_family == AF_UNIX && | |
921 | b->sockaddr.un.sun_path[0] != 0) { | |
922 | ||
923 | /* This connection attempt failed, let's release the socket for now, and start with a | |
924 | * fresh one when reconnecting. */ | |
925 | bus_close_io_fds(b); | |
926 | ||
927 | if (inotify_done) { | |
928 | /* inotify set up already, don't do it again, just return now, and remember | |
929 | * that we are waiting for inotify events now. */ | |
3e0e196e | 930 | bus_set_state(b, BUS_WATCH_BIND); |
8a5cd31e LP |
931 | return 1; |
932 | } | |
933 | ||
934 | /* This is a file system socket, and the inotify logic is enabled. Let's create the necessary inotify fd. */ | |
935 | r = bus_socket_inotify_setup(b); | |
936 | if (r < 0) | |
937 | return r; | |
938 | ||
939 | /* Let's now try to connect a second time, because in theory there's otherwise a race | |
940 | * here: the socket might have been created in the time between our first connect() and | |
941 | * the time we set up the inotify logic. But let's remember that we set up inotify now, | |
942 | * so that we don't do the connect() more than twice. */ | |
943 | inotify_done = true; | |
944 | ||
945 | } else | |
946 | return -errno; | |
947 | } else | |
948 | break; | |
a7e3212d LP |
949 | } |
950 | ||
8a5cd31e LP |
951 | /* Yay, established, we don't need no inotify anymore! */ |
952 | bus_close_inotify_fd(b); | |
953 | ||
a7e3212d LP |
954 | return bus_socket_start_auth(b); |
955 | } | |
956 | ||
957 | int bus_socket_exec(sd_bus *b) { | |
e82c9509 | 958 | int s[2], r; |
a7e3212d LP |
959 | |
960 | assert(b); | |
e82c9509 LP |
961 | assert(b->input_fd < 0); |
962 | assert(b->output_fd < 0); | |
a7e3212d | 963 | assert(b->exec_path); |
392cf1d0 | 964 | assert(b->busexec_pid == 0); |
a7e3212d | 965 | |
165fee86 ZJS |
966 | log_debug("sd-bus: starting bus%s%s with %s...", |
967 | b->description ? " " : "", strempty(b->description), b->exec_path); | |
968 | ||
e82c9509 LP |
969 | r = socketpair(AF_UNIX, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, s); |
970 | if (r < 0) | |
a7e3212d LP |
971 | return -errno; |
972 | ||
392cf1d0 | 973 | r = safe_fork_full("(sd-busexec)", s+1, 1, FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS, &b->busexec_pid); |
4c253ed1 | 974 | if (r < 0) { |
3d94f76c | 975 | safe_close_pair(s); |
4c253ed1 | 976 | return r; |
a7e3212d | 977 | } |
4c253ed1 | 978 | if (r == 0) { |
a7e3212d LP |
979 | /* Child */ |
980 | ||
2b33ab09 LP |
981 | if (rearrange_stdio(s[1], s[1], STDERR_FILENO) < 0) |
982 | _exit(EXIT_FAILURE); | |
a7e3212d | 983 | |
595225af LP |
984 | (void) rlimit_nofile_safe(); |
985 | ||
a7e3212d LP |
986 | if (b->exec_argv) |
987 | execvp(b->exec_path, b->exec_argv); | |
988 | else { | |
989 | const char *argv[] = { b->exec_path, NULL }; | |
990 | execvp(b->exec_path, (char**) argv); | |
991 | } | |
992 | ||
993 | _exit(EXIT_FAILURE); | |
994 | } | |
995 | ||
03e334a1 | 996 | safe_close(s[1]); |
7fe2903c | 997 | b->output_fd = b->input_fd = fd_move_above_stdio(s[0]); |
a7e3212d | 998 | |
8f04d2eb | 999 | bus_socket_setup(b); |
e1d337d4 | 1000 | |
a7e3212d LP |
1001 | return bus_socket_start_auth(b); |
1002 | } | |
1003 | ||
1004 | int bus_socket_take_fd(sd_bus *b) { | |
a7e3212d LP |
1005 | assert(b); |
1006 | ||
8f04d2eb | 1007 | bus_socket_setup(b); |
a7e3212d LP |
1008 | |
1009 | return bus_socket_start_auth(b); | |
1010 | } | |
1011 | ||
1012 | int bus_socket_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) { | |
a7e3212d LP |
1013 | struct iovec *iov; |
1014 | ssize_t k; | |
1015 | size_t n; | |
1016 | unsigned j; | |
bc7fd8cd | 1017 | int r; |
a7e3212d LP |
1018 | |
1019 | assert(bus); | |
1020 | assert(m); | |
1021 | assert(idx); | |
945c2931 | 1022 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 1023 | |
6629161f | 1024 | if (*idx >= BUS_MESSAGE_SIZE(m)) |
a7e3212d | 1025 | return 0; |
a7e3212d | 1026 | |
bc7fd8cd LP |
1027 | r = bus_message_setup_iovec(m); |
1028 | if (r < 0) | |
1029 | return r; | |
2100fa10 | 1030 | |
a7e3212d | 1031 | n = m->n_iovec * sizeof(struct iovec); |
6e9417f5 | 1032 | iov = newa(struct iovec, n); |
75f32f04 | 1033 | memcpy_safe(iov, m->iovec, n); |
a7e3212d LP |
1034 | |
1035 | j = 0; | |
1036 | iovec_advance(iov, &j, *idx); | |
1037 | ||
15d5af81 LP |
1038 | if (bus->prefer_writev) |
1039 | k = writev(bus->output_fd, iov, m->n_iovec); | |
1040 | else { | |
7f4e6a1c ZJS |
1041 | struct msghdr mh = { |
1042 | .msg_iov = iov, | |
1043 | .msg_iovlen = m->n_iovec, | |
1044 | }; | |
15d5af81 | 1045 | |
f29eef2e | 1046 | if (m->n_fds > 0 && *idx == 0) { |
15d5af81 | 1047 | struct cmsghdr *control; |
15d5af81 | 1048 | |
a258f491 LP |
1049 | mh.msg_controllen = CMSG_SPACE(sizeof(int) * m->n_fds); |
1050 | mh.msg_control = alloca0(mh.msg_controllen); | |
1051 | control = CMSG_FIRSTHDR(&mh); | |
1052 | control->cmsg_len = CMSG_LEN(sizeof(int) * m->n_fds); | |
15d5af81 LP |
1053 | control->cmsg_level = SOL_SOCKET; |
1054 | control->cmsg_type = SCM_RIGHTS; | |
15d5af81 LP |
1055 | memcpy(CMSG_DATA(control), m->fds, sizeof(int) * m->n_fds); |
1056 | } | |
1057 | ||
15d5af81 LP |
1058 | k = sendmsg(bus->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); |
1059 | if (k < 0 && errno == ENOTSOCK) { | |
1060 | bus->prefer_writev = true; | |
1061 | k = writev(bus->output_fd, iov, m->n_iovec); | |
1062 | } | |
1063 | } | |
a7e3212d | 1064 | |
a7e3212d LP |
1065 | if (k < 0) |
1066 | return errno == EAGAIN ? 0 : -errno; | |
1067 | ||
1068 | *idx += (size_t) k; | |
1069 | return 1; | |
1070 | } | |
1071 | ||
1072 | static int bus_socket_read_message_need(sd_bus *bus, size_t *need) { | |
1073 | uint32_t a, b; | |
1074 | uint8_t e; | |
1075 | uint64_t sum; | |
1076 | ||
1077 | assert(bus); | |
1078 | assert(need); | |
945c2931 | 1079 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1080 | |
1081 | if (bus->rbuffer_size < sizeof(struct bus_header)) { | |
1082 | *need = sizeof(struct bus_header) + 8; | |
1083 | ||
1084 | /* Minimum message size: | |
1085 | * | |
1086 | * Header + | |
1087 | * | |
1088 | * Method Call: +2 string headers | |
1089 | * Signal: +3 string headers | |
1090 | * Method Error: +1 string headers | |
1091 | * +1 uint32 headers | |
1092 | * Method Reply: +1 uint32 headers | |
1093 | * | |
1094 | * A string header is at least 9 bytes | |
1095 | * A uint32 header is at least 8 bytes | |
1096 | * | |
1097 | * Hence the minimum message size of a valid message | |
1098 | * is header + 8 bytes */ | |
1099 | ||
1100 | return 0; | |
1101 | } | |
1102 | ||
1103 | a = ((const uint32_t*) bus->rbuffer)[1]; | |
1104 | b = ((const uint32_t*) bus->rbuffer)[3]; | |
1105 | ||
1106 | e = ((const uint8_t*) bus->rbuffer)[0]; | |
0461f8cd | 1107 | if (e == BUS_LITTLE_ENDIAN) { |
a7e3212d LP |
1108 | a = le32toh(a); |
1109 | b = le32toh(b); | |
0461f8cd | 1110 | } else if (e == BUS_BIG_ENDIAN) { |
a7e3212d LP |
1111 | a = be32toh(a); |
1112 | b = be32toh(b); | |
1113 | } else | |
1114 | return -EBADMSG; | |
1115 | ||
1116 | sum = (uint64_t) sizeof(struct bus_header) + (uint64_t) ALIGN_TO(b, 8) + (uint64_t) a; | |
1117 | if (sum >= BUS_MESSAGE_SIZE_MAX) | |
1118 | return -ENOBUFS; | |
1119 | ||
1120 | *need = (size_t) sum; | |
1121 | return 0; | |
1122 | } | |
1123 | ||
7d22c717 | 1124 | static int bus_socket_make_message(sd_bus *bus, size_t size) { |
6d586a13 | 1125 | sd_bus_message *t = NULL; |
a7e3212d LP |
1126 | void *b; |
1127 | int r; | |
1128 | ||
1129 | assert(bus); | |
a7e3212d | 1130 | assert(bus->rbuffer_size >= size); |
945c2931 | 1131 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 1132 | |
7adc46fc LP |
1133 | r = bus_rqueue_make_room(bus); |
1134 | if (r < 0) | |
1135 | return r; | |
1136 | ||
a7e3212d LP |
1137 | if (bus->rbuffer_size > size) { |
1138 | b = memdup((const uint8_t*) bus->rbuffer + size, | |
1139 | bus->rbuffer_size - size); | |
1140 | if (!b) | |
1141 | return -ENOMEM; | |
1142 | } else | |
1143 | b = NULL; | |
1144 | ||
df2d202e LP |
1145 | r = bus_message_from_malloc(bus, |
1146 | bus->rbuffer, size, | |
a7e3212d | 1147 | bus->fds, bus->n_fds, |
038f9863 | 1148 | NULL, |
a7e3212d | 1149 | &t); |
3dec5201 | 1150 | if (r == -EBADMSG) { |
6d586a13 | 1151 | log_debug_errno(r, "Received invalid message from connection %s, dropping.", strna(bus->description)); |
3dec5201 ZJS |
1152 | free(bus->rbuffer); /* We want to drop current rbuffer and proceed with whatever remains in b */ |
1153 | } else if (r < 0) { | |
a7e3212d LP |
1154 | free(b); |
1155 | return r; | |
1156 | } | |
1157 | ||
3dec5201 | 1158 | /* rbuffer ownership was either transferred to t, or we got EBADMSG and dropped it. */ |
a7e3212d LP |
1159 | bus->rbuffer = b; |
1160 | bus->rbuffer_size -= size; | |
1161 | ||
1162 | bus->fds = NULL; | |
1163 | bus->n_fds = 0; | |
1164 | ||
c1757a70 | 1165 | if (t) { |
f1617a3b | 1166 | t->read_counter = ++bus->read_counter; |
c1757a70 LP |
1167 | bus->rqueue[bus->rqueue_size++] = bus_message_ref_queued(t, bus); |
1168 | sd_bus_message_unref(t); | |
1169 | } | |
7d22c717 | 1170 | |
a7e3212d LP |
1171 | return 1; |
1172 | } | |
1173 | ||
7d22c717 | 1174 | int bus_socket_read_message(sd_bus *bus) { |
a7e3212d | 1175 | struct msghdr mh; |
7f4e6a1c | 1176 | struct iovec iov = {}; |
a7e3212d LP |
1177 | ssize_t k; |
1178 | size_t need; | |
1179 | int r; | |
1180 | void *b; | |
fb29cdbe | 1181 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)) control; |
4d3a5b10 | 1182 | bool handle_cmsg = false; |
a7e3212d LP |
1183 | |
1184 | assert(bus); | |
945c2931 | 1185 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1186 | |
1187 | r = bus_socket_read_message_need(bus, &need); | |
1188 | if (r < 0) | |
1189 | return r; | |
1190 | ||
1191 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1192 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1193 | |
1194 | b = realloc(bus->rbuffer, need); | |
1195 | if (!b) | |
1196 | return -ENOMEM; | |
1197 | ||
1198 | bus->rbuffer = b; | |
1199 | ||
5cfa2c3d | 1200 | iov = IOVEC_MAKE((uint8_t *)bus->rbuffer + bus->rbuffer_size, need - bus->rbuffer_size); |
a7e3212d | 1201 | |
c1093c34 | 1202 | if (bus->prefer_readv) { |
15d5af81 | 1203 | k = readv(bus->input_fd, &iov, 1); |
c1093c34 LP |
1204 | if (k < 0) |
1205 | k = -errno; | |
1206 | } else { | |
41ab8c67 LP |
1207 | mh = (struct msghdr) { |
1208 | .msg_iov = &iov, | |
1209 | .msg_iovlen = 1, | |
1210 | .msg_control = &control, | |
1211 | .msg_controllen = sizeof(control), | |
1212 | }; | |
15d5af81 | 1213 | |
3691bcf3 LP |
1214 | k = recvmsg_safe(bus->input_fd, &mh, MSG_DONTWAIT|MSG_CMSG_CLOEXEC); |
1215 | if (k == -ENOTSOCK) { | |
15d5af81 LP |
1216 | bus->prefer_readv = true; |
1217 | k = readv(bus->input_fd, &iov, 1); | |
3691bcf3 LP |
1218 | if (k < 0) |
1219 | k = -errno; | |
15d5af81 LP |
1220 | } else |
1221 | handle_cmsg = true; | |
1222 | } | |
3691bcf3 LP |
1223 | if (k == -EAGAIN) |
1224 | return 0; | |
a7e3212d | 1225 | if (k < 0) |
3691bcf3 LP |
1226 | return (int) k; |
1227 | if (k == 0) { | |
1228 | if (handle_cmsg) | |
1229 | cmsg_close_all(&mh); /* On EOF we shouldn't have gotten an fd, but let's make sure */ | |
a7e3212d | 1230 | return -ECONNRESET; |
3691bcf3 | 1231 | } |
a7e3212d LP |
1232 | |
1233 | bus->rbuffer_size += k; | |
1234 | ||
2a1288ff LP |
1235 | if (handle_cmsg) { |
1236 | struct cmsghdr *cmsg; | |
1237 | ||
1238 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
1239 | if (cmsg->cmsg_level == SOL_SOCKET && |
1240 | cmsg->cmsg_type == SCM_RIGHTS) { | |
7fe2903c | 1241 | int n, *f, i; |
15d5af81 LP |
1242 | |
1243 | n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
1244 | ||
1245 | if (!bus->can_fds) { | |
1246 | /* Whut? We received fds but this | |
1247 | * isn't actually enabled? Close them, | |
1248 | * and fail */ | |
1249 | ||
1250 | close_many((int*) CMSG_DATA(cmsg), n); | |
1251 | return -EIO; | |
1252 | } | |
1253 | ||
62d74c78 | 1254 | f = reallocarray(bus->fds, bus->n_fds + n, sizeof(int)); |
15d5af81 LP |
1255 | if (!f) { |
1256 | close_many((int*) CMSG_DATA(cmsg), n); | |
1257 | return -ENOMEM; | |
1258 | } | |
1259 | ||
7fe2903c LP |
1260 | for (i = 0; i < n; i++) |
1261 | f[bus->n_fds++] = fd_move_above_stdio(((int*) CMSG_DATA(cmsg))[i]); | |
15d5af81 | 1262 | bus->fds = f; |
d868f2a3 ZJS |
1263 | } else |
1264 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
1265 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 1266 | } |
a7e3212d LP |
1267 | |
1268 | r = bus_socket_read_message_need(bus, &need); | |
1269 | if (r < 0) | |
1270 | return r; | |
1271 | ||
1272 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1273 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1274 | |
1275 | return 1; | |
1276 | } | |
1277 | ||
1278 | int bus_socket_process_opening(sd_bus *b) { | |
0f2d351f | 1279 | int error = 0, events, r; |
a7e3212d | 1280 | socklen_t slen = sizeof(error); |
a7e3212d | 1281 | |
a7e3212d LP |
1282 | assert(b->state == BUS_OPENING); |
1283 | ||
0f2d351f LP |
1284 | events = fd_wait_for_event(b->output_fd, POLLOUT, 0); |
1285 | if (events < 0) | |
1286 | return events; | |
1287 | if (!(events & (POLLOUT|POLLERR|POLLHUP))) | |
a7e3212d LP |
1288 | return 0; |
1289 | ||
e82c9509 | 1290 | r = getsockopt(b->output_fd, SOL_SOCKET, SO_ERROR, &error, &slen); |
a7e3212d LP |
1291 | if (r < 0) |
1292 | b->last_connect_error = errno; | |
1293 | else if (error != 0) | |
1294 | b->last_connect_error = error; | |
0f2d351f | 1295 | else if (events & (POLLERR|POLLHUP)) |
a7e3212d LP |
1296 | b->last_connect_error = ECONNREFUSED; |
1297 | else | |
1298 | return bus_socket_start_auth(b); | |
1299 | ||
1300 | return bus_next_address(b); | |
1301 | } | |
1302 | ||
1303 | int bus_socket_process_authenticating(sd_bus *b) { | |
1304 | int r; | |
1305 | ||
1306 | assert(b); | |
1307 | assert(b->state == BUS_AUTHENTICATING); | |
1308 | ||
1309 | if (now(CLOCK_MONOTONIC) >= b->auth_timeout) | |
1310 | return -ETIMEDOUT; | |
1311 | ||
1312 | r = bus_socket_write_auth(b); | |
1313 | if (r != 0) | |
1314 | return r; | |
1315 | ||
1316 | return bus_socket_read_auth(b); | |
1317 | } | |
8a5cd31e LP |
1318 | |
1319 | int bus_socket_process_watch_bind(sd_bus *b) { | |
1320 | int r, q; | |
1321 | ||
1322 | assert(b); | |
1323 | assert(b->state == BUS_WATCH_BIND); | |
1324 | assert(b->inotify_fd >= 0); | |
1325 | ||
1326 | r = flush_fd(b->inotify_fd); | |
1327 | if (r <= 0) | |
1328 | return r; | |
1329 | ||
1330 | log_debug("Got inotify event on bus %s.", strna(b->description)); | |
1331 | ||
1332 | /* We flushed events out of the inotify fd. In that case, maybe the socket is valid now? Let's try to connect | |
1333 | * to it again */ | |
1334 | ||
1335 | r = bus_socket_connect(b); | |
1336 | if (r < 0) | |
1337 | return r; | |
1338 | ||
1339 | q = bus_attach_io_events(b); | |
1340 | if (q < 0) | |
1341 | return q; | |
1342 | ||
1343 | q = bus_attach_inotify_event(b); | |
1344 | if (q < 0) | |
1345 | return q; | |
1346 | ||
1347 | return r; | |
1348 | } |