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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 | 14 | #include "bus-socket.h" |
87fa2e21 | 15 | #include "escape.h" |
3ffd4af2 | 16 | #include "fd-util.h" |
f97b34a6 | 17 | #include "format-util.h" |
8a5cd31e | 18 | #include "fs-util.h" |
15a5e950 | 19 | #include "hexdecoct.h" |
8a5cd31e | 20 | #include "io-util.h" |
a7e3212d | 21 | #include "macro.h" |
0a970718 | 22 | #include "memory-util.h" |
8a5cd31e | 23 | #include "path-util.h" |
dccca82b | 24 | #include "process-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 | 29 | #include "utf8.h" |
a7e3212d | 30 | |
aec6d91f LP |
31 | #define SNDBUF_SIZE (8*1024*1024) |
32 | ||
2181a7f5 | 33 | static void iovec_advance(struct iovec iov[], unsigned *idx, size_t size) { |
a7e3212d LP |
34 | |
35 | while (size > 0) { | |
36 | struct iovec *i = iov + *idx; | |
37 | ||
38 | if (i->iov_len > size) { | |
39 | i->iov_base = (uint8_t*) i->iov_base + size; | |
40 | i->iov_len -= size; | |
41 | return; | |
42 | } | |
43 | ||
44 | size -= i->iov_len; | |
45 | ||
5cfa2c3d | 46 | *i = IOVEC_MAKE(NULL, 0); |
a7e3212d | 47 | |
313cefa1 | 48 | (*idx)++; |
a7e3212d LP |
49 | } |
50 | } | |
51 | ||
bc7fd8cd | 52 | static int append_iovec(sd_bus_message *m, const void *p, size_t sz) { |
2100fa10 LP |
53 | assert(m); |
54 | assert(p); | |
55 | assert(sz > 0); | |
56 | ||
5cfa2c3d | 57 | m->iovec[m->n_iovec++] = IOVEC_MAKE((void*) p, sz); |
bc7fd8cd LP |
58 | |
59 | return 0; | |
2100fa10 LP |
60 | } |
61 | ||
bc7fd8cd LP |
62 | static int bus_message_setup_iovec(sd_bus_message *m) { |
63 | struct bus_body_part *part; | |
13c299d3 | 64 | unsigned n, i; |
bc7fd8cd LP |
65 | int r; |
66 | ||
2100fa10 LP |
67 | assert(m); |
68 | assert(m->sealed); | |
69 | ||
70 | if (m->n_iovec > 0) | |
bc7fd8cd LP |
71 | return 0; |
72 | ||
73 | assert(!m->iovec); | |
2100fa10 | 74 | |
c91cb83c | 75 | n = 1 + m->n_body_parts; |
bc7fd8cd LP |
76 | if (n < ELEMENTSOF(m->iovec_fixed)) |
77 | m->iovec = m->iovec_fixed; | |
78 | else { | |
79 | m->iovec = new(struct iovec, n); | |
66b26c5c LP |
80 | if (!m->iovec) { |
81 | r = -ENOMEM; | |
82 | goto fail; | |
83 | } | |
bc7fd8cd | 84 | } |
2100fa10 | 85 | |
c91cb83c | 86 | r = append_iovec(m, m->header, BUS_MESSAGE_BODY_BEGIN(m)); |
bc7fd8cd | 87 | if (r < 0) |
66b26c5c | 88 | goto fail; |
2100fa10 | 89 | |
9b29bb68 | 90 | MESSAGE_FOREACH_PART(part, i, m) { |
66b26c5c LP |
91 | r = bus_body_part_map(part); |
92 | if (r < 0) | |
93 | goto fail; | |
94 | ||
bc7fd8cd LP |
95 | r = append_iovec(m, part->data, part->size); |
96 | if (r < 0) | |
66b26c5c | 97 | goto fail; |
bc7fd8cd LP |
98 | } |
99 | ||
100 | assert(n == m->n_iovec); | |
101 | ||
102 | return 0; | |
66b26c5c LP |
103 | |
104 | fail: | |
105 | m->poisoned = true; | |
106 | return r; | |
2100fa10 LP |
107 | } |
108 | ||
2181a7f5 LP |
109 | bool bus_socket_auth_needs_write(sd_bus *b) { |
110 | ||
111 | unsigned i; | |
112 | ||
113 | if (b->auth_index >= ELEMENTSOF(b->auth_iovec)) | |
114 | return false; | |
115 | ||
116 | for (i = b->auth_index; i < ELEMENTSOF(b->auth_iovec); i++) { | |
117 | struct iovec *j = b->auth_iovec + i; | |
118 | ||
119 | if (j->iov_len > 0) | |
120 | return true; | |
121 | } | |
122 | ||
123 | return false; | |
124 | } | |
125 | ||
2181a7f5 | 126 | static int bus_socket_auth_verify_client(sd_bus *b) { |
347f4824 | 127 | char *l, *lines[4] = {}; |
a7e3212d | 128 | sd_id128_t peer; |
347f4824 | 129 | size_t i, n; |
a7e3212d LP |
130 | int r; |
131 | ||
2181a7f5 LP |
132 | assert(b); |
133 | ||
1ed4723d | 134 | /* |
347f4824 DR |
135 | * We expect up to three response lines: |
136 | * "DATA\r\n" (optional) | |
1ed4723d DR |
137 | * "OK <server-id>\r\n" |
138 | * "AGREE_UNIX_FD\r\n" (optional) | |
139 | */ | |
a7e3212d | 140 | |
347f4824 DR |
141 | n = 0; |
142 | lines[n] = b->rbuffer; | |
143 | for (i = 0; i < 3; ++i) { | |
144 | l = memmem_safe(lines[n], b->rbuffer_size - (lines[n] - (char*) b->rbuffer), "\r\n", 2); | |
145 | if (l) | |
146 | lines[++n] = l + 2; | |
147 | else | |
148 | break; | |
a7e3212d LP |
149 | } |
150 | ||
347f4824 DR |
151 | /* |
152 | * If we sent a non-empty initial response, then we just expect an OK | |
153 | * reply. We currently do this if, and only if, we picked ANONYMOUS. | |
154 | * If we did not send an initial response, then we expect a DATA | |
155 | * challenge, reply with our own DATA, and expect an OK reply. We do | |
156 | * this for EXTERNAL. | |
157 | * If FD negotiation was requested, we additionally expect | |
158 | * an AGREE_UNIX_FD response in all cases. | |
159 | */ | |
160 | if (n < (b->anonymous_auth ? 1U : 2U) + !!b->accept_fd) | |
161 | return 0; /* wait for more data */ | |
162 | ||
163 | i = 0; | |
164 | ||
165 | /* In case of EXTERNAL, verify the first response was DATA. */ | |
166 | if (!b->anonymous_auth) { | |
167 | l = lines[i++]; | |
168 | if (lines[i] - l == 4 + 2) { | |
169 | if (memcmp(l, "DATA", 4)) | |
170 | return -EPERM; | |
171 | } else if (lines[i] - l == 3 + 32 + 2) { | |
172 | /* | |
173 | * Old versions of the server-side implementation of | |
174 | * `sd-bus` replied with "OK <id>" to "AUTH" requests | |
175 | * from a client, even if the "AUTH" line did not | |
176 | * contain inlined arguments. Therefore, we also accept | |
177 | * "OK <id>" here, even though it is technically the | |
178 | * wrong reply. We ignore the "<id>" parameter, though, | |
179 | * since it has no real value. | |
180 | */ | |
181 | if (memcmp(l, "OK ", 3)) | |
182 | return -EPERM; | |
183 | } else | |
1ed4723d | 184 | return -EPERM; |
347f4824 | 185 | } |
a7e3212d | 186 | |
1ed4723d | 187 | /* Now check the OK line. */ |
347f4824 | 188 | l = lines[i++]; |
1ed4723d | 189 | |
347f4824 | 190 | if (lines[i] - l != 3 + 32 + 2) |
a7e3212d | 191 | return -EPERM; |
347f4824 | 192 | if (memcmp(l, "OK ", 3)) |
a7e3212d LP |
193 | return -EPERM; |
194 | ||
2181a7f5 LP |
195 | b->auth = b->anonymous_auth ? BUS_AUTH_ANONYMOUS : BUS_AUTH_EXTERNAL; |
196 | ||
347f4824 | 197 | for (unsigned j = 0; j < 32; j += 2) { |
a7e3212d LP |
198 | int x, y; |
199 | ||
347f4824 DR |
200 | x = unhexchar(l[3 + j]); |
201 | y = unhexchar(l[3 + j + 1]); | |
a7e3212d LP |
202 | |
203 | if (x < 0 || y < 0) | |
204 | return -EINVAL; | |
205 | ||
347f4824 | 206 | peer.bytes[j/2] = ((uint8_t) x << 4 | (uint8_t) y); |
a7e3212d LP |
207 | } |
208 | ||
3bbaff3e | 209 | if (!sd_id128_is_null(b->server_id) && |
98178d39 | 210 | !sd_id128_equal(b->server_id, peer)) |
a7e3212d LP |
211 | return -EPERM; |
212 | ||
98178d39 | 213 | b->server_id = peer; |
a7e3212d | 214 | |
1ed4723d | 215 | /* And possibly check the third line, too */ |
347f4824 DR |
216 | if (b->accept_fd) { |
217 | l = lines[i++]; | |
218 | b->can_fds = !!memory_startswith(l, lines[i] - l, "AGREE_UNIX_FD"); | |
219 | } | |
a7e3212d | 220 | |
347f4824 | 221 | assert(i == n); |
a7e3212d | 222 | |
347f4824 DR |
223 | b->rbuffer_size -= (lines[i] - (char*) b->rbuffer); |
224 | memmove(b->rbuffer, lines[i], b->rbuffer_size); | |
a7e3212d LP |
225 | |
226 | r = bus_start_running(b); | |
227 | if (r < 0) | |
228 | return r; | |
229 | ||
230 | return 1; | |
231 | } | |
232 | ||
2181a7f5 LP |
233 | static bool line_equals(const char *s, size_t m, const char *line) { |
234 | size_t l; | |
235 | ||
236 | l = strlen(line); | |
237 | if (l != m) | |
238 | return false; | |
239 | ||
240 | return memcmp(s, line, l) == 0; | |
241 | } | |
242 | ||
243 | static bool line_begins(const char *s, size_t m, const char *word) { | |
d27b725a | 244 | const char *p; |
2181a7f5 | 245 | |
d27b725a | 246 | p = memory_startswith(s, m, word); |
3f10c662 | 247 | return p && (p == (s + m) || *p == ' '); |
2181a7f5 LP |
248 | } |
249 | ||
250 | static int verify_anonymous_token(sd_bus *b, const char *p, size_t l) { | |
251 | _cleanup_free_ char *token = NULL; | |
30494563 TG |
252 | size_t len; |
253 | int r; | |
2181a7f5 LP |
254 | |
255 | if (!b->anonymous_auth) | |
256 | return 0; | |
257 | ||
258 | if (l <= 0) | |
259 | return 1; | |
260 | ||
261 | assert(p[0] == ' '); | |
262 | p++; l--; | |
263 | ||
264 | if (l % 2 != 0) | |
265 | return 0; | |
2181a7f5 | 266 | |
30494563 TG |
267 | r = unhexmem(p, l, (void **) &token, &len); |
268 | if (r < 0) | |
269 | return 0; | |
270 | ||
271 | if (memchr(token, 0, len)) | |
2181a7f5 LP |
272 | return 0; |
273 | ||
274 | return !!utf8_is_valid(token); | |
275 | } | |
276 | ||
277 | static int verify_external_token(sd_bus *b, const char *p, size_t l) { | |
278 | _cleanup_free_ char *token = NULL; | |
30494563 | 279 | size_t len; |
2181a7f5 LP |
280 | uid_t u; |
281 | int r; | |
282 | ||
b3d06b92 | 283 | /* We don't do any real authentication here. Instead, if |
be7148eb | 284 | * the owner of this bus wanted authentication they should have |
2181a7f5 LP |
285 | * checked SO_PEERCRED before even creating the bus object. */ |
286 | ||
8411d2a2 | 287 | if (!b->anonymous_auth && !b->ucred_valid) |
2181a7f5 LP |
288 | return 0; |
289 | ||
290 | if (l <= 0) | |
291 | return 1; | |
292 | ||
293 | assert(p[0] == ' '); | |
294 | p++; l--; | |
295 | ||
296 | if (l % 2 != 0) | |
297 | return 0; | |
298 | ||
30494563 TG |
299 | r = unhexmem(p, l, (void**) &token, &len); |
300 | if (r < 0) | |
301 | return 0; | |
2181a7f5 | 302 | |
30494563 | 303 | if (memchr(token, 0, len)) |
2181a7f5 LP |
304 | return 0; |
305 | ||
306 | r = parse_uid(token, &u); | |
307 | if (r < 0) | |
308 | return 0; | |
309 | ||
8411d2a2 LP |
310 | /* We ignore the passed value if anonymous authentication is |
311 | * on anyway. */ | |
312 | if (!b->anonymous_auth && u != b->ucred.uid) | |
2181a7f5 LP |
313 | return 0; |
314 | ||
315 | return 1; | |
316 | } | |
317 | ||
318 | static int bus_socket_auth_write(sd_bus *b, const char *t) { | |
319 | char *p; | |
320 | size_t l; | |
321 | ||
322 | assert(b); | |
323 | assert(t); | |
324 | ||
325 | /* We only make use of the first iovec */ | |
945c2931 | 326 | assert(IN_SET(b->auth_index, 0, 1)); |
2181a7f5 LP |
327 | |
328 | l = strlen(t); | |
329 | p = malloc(b->auth_iovec[0].iov_len + l); | |
330 | if (!p) | |
331 | return -ENOMEM; | |
332 | ||
75f32f04 | 333 | memcpy_safe(p, b->auth_iovec[0].iov_base, b->auth_iovec[0].iov_len); |
2181a7f5 LP |
334 | memcpy(p + b->auth_iovec[0].iov_len, t, l); |
335 | ||
336 | b->auth_iovec[0].iov_base = p; | |
337 | b->auth_iovec[0].iov_len += l; | |
338 | ||
339 | free(b->auth_buffer); | |
340 | b->auth_buffer = p; | |
341 | b->auth_index = 0; | |
342 | return 0; | |
343 | } | |
344 | ||
345 | static int bus_socket_auth_write_ok(sd_bus *b) { | |
346 | char t[3 + 32 + 2 + 1]; | |
347 | ||
348 | assert(b); | |
349 | ||
5ffa8c81 | 350 | xsprintf(t, "OK " SD_ID128_FORMAT_STR "\r\n", SD_ID128_FORMAT_VAL(b->server_id)); |
2181a7f5 LP |
351 | |
352 | return bus_socket_auth_write(b, t); | |
353 | } | |
354 | ||
355 | static int bus_socket_auth_verify_server(sd_bus *b) { | |
356 | char *e; | |
357 | const char *line; | |
358 | size_t l; | |
359 | bool processed = false; | |
360 | int r; | |
361 | ||
362 | assert(b); | |
363 | ||
2b4ac889 | 364 | if (b->rbuffer_size < 1) |
2181a7f5 LP |
365 | return 0; |
366 | ||
367 | /* First char must be a NUL byte */ | |
368 | if (*(char*) b->rbuffer != 0) | |
369 | return -EIO; | |
370 | ||
2b4ac889 LP |
371 | if (b->rbuffer_size < 3) |
372 | return 0; | |
373 | ||
2181a7f5 LP |
374 | /* Begin with the first line */ |
375 | if (b->auth_rbegin <= 0) | |
376 | b->auth_rbegin = 1; | |
377 | ||
378 | for (;;) { | |
379 | /* Check if line is complete */ | |
380 | line = (char*) b->rbuffer + b->auth_rbegin; | |
e8b08edc | 381 | e = memmem_safe(line, b->rbuffer_size - b->auth_rbegin, "\r\n", 2); |
2181a7f5 LP |
382 | if (!e) |
383 | return processed; | |
384 | ||
385 | l = e - line; | |
386 | ||
387 | if (line_begins(line, l, "AUTH ANONYMOUS")) { | |
388 | ||
3cacdab9 DR |
389 | r = verify_anonymous_token(b, |
390 | line + strlen("AUTH ANONYMOUS"), | |
391 | l - strlen("AUTH ANONYMOUS")); | |
2181a7f5 LP |
392 | if (r < 0) |
393 | return r; | |
394 | if (r == 0) | |
395 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
396 | else { | |
397 | b->auth = BUS_AUTH_ANONYMOUS; | |
2010873b DR |
398 | if (l <= strlen("AUTH ANONYMOUS")) |
399 | r = bus_socket_auth_write(b, "DATA\r\n"); | |
400 | else | |
401 | r = bus_socket_auth_write_ok(b); | |
2181a7f5 LP |
402 | } |
403 | ||
404 | } else if (line_begins(line, l, "AUTH EXTERNAL")) { | |
405 | ||
3cacdab9 DR |
406 | r = verify_external_token(b, |
407 | line + strlen("AUTH EXTERNAL"), | |
408 | l - strlen("AUTH EXTERNAL")); | |
2181a7f5 LP |
409 | if (r < 0) |
410 | return r; | |
411 | if (r == 0) | |
412 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
413 | else { | |
414 | b->auth = BUS_AUTH_EXTERNAL; | |
2010873b DR |
415 | if (l <= strlen("AUTH EXTERNAL")) |
416 | r = bus_socket_auth_write(b, "DATA\r\n"); | |
417 | else | |
418 | r = bus_socket_auth_write_ok(b); | |
2181a7f5 LP |
419 | } |
420 | ||
421 | } else if (line_begins(line, l, "AUTH")) | |
422 | r = bus_socket_auth_write(b, "REJECTED EXTERNAL ANONYMOUS\r\n"); | |
423 | else if (line_equals(line, l, "CANCEL") || | |
424 | line_begins(line, l, "ERROR")) { | |
425 | ||
426 | b->auth = _BUS_AUTH_INVALID; | |
427 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
428 | ||
429 | } else if (line_equals(line, l, "BEGIN")) { | |
430 | ||
431 | if (b->auth == _BUS_AUTH_INVALID) | |
432 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
433 | else { | |
434 | /* We can't leave from the auth phase | |
435 | * before we haven't written | |
436 | * everything queued, so let's check | |
437 | * that */ | |
438 | ||
439 | if (bus_socket_auth_needs_write(b)) | |
440 | return 1; | |
441 | ||
442 | b->rbuffer_size -= (e + 2 - (char*) b->rbuffer); | |
443 | memmove(b->rbuffer, e + 2, b->rbuffer_size); | |
444 | return bus_start_running(b); | |
445 | } | |
446 | ||
447 | } else if (line_begins(line, l, "DATA")) { | |
448 | ||
449 | if (b->auth == _BUS_AUTH_INVALID) | |
450 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
451 | else { | |
452 | if (b->auth == BUS_AUTH_ANONYMOUS) | |
453 | r = verify_anonymous_token(b, line + 4, l - 4); | |
454 | else | |
455 | r = verify_external_token(b, line + 4, l - 4); | |
456 | ||
457 | if (r < 0) | |
458 | return r; | |
459 | if (r == 0) { | |
460 | b->auth = _BUS_AUTH_INVALID; | |
461 | r = bus_socket_auth_write(b, "REJECTED\r\n"); | |
462 | } else | |
463 | r = bus_socket_auth_write_ok(b); | |
464 | } | |
465 | } else if (line_equals(line, l, "NEGOTIATE_UNIX_FD")) { | |
c7db1984 | 466 | if (b->auth == _BUS_AUTH_INVALID || !b->accept_fd) |
2181a7f5 LP |
467 | r = bus_socket_auth_write(b, "ERROR\r\n"); |
468 | else { | |
469 | b->can_fds = true; | |
470 | r = bus_socket_auth_write(b, "AGREE_UNIX_FD\r\n"); | |
471 | } | |
472 | } else | |
473 | r = bus_socket_auth_write(b, "ERROR\r\n"); | |
474 | ||
475 | if (r < 0) | |
476 | return r; | |
477 | ||
478 | b->auth_rbegin = e + 2 - (char*) b->rbuffer; | |
479 | ||
480 | processed = true; | |
481 | } | |
482 | } | |
483 | ||
484 | static int bus_socket_auth_verify(sd_bus *b) { | |
485 | assert(b); | |
486 | ||
487 | if (b->is_server) | |
488 | return bus_socket_auth_verify_server(b); | |
489 | else | |
490 | return bus_socket_auth_verify_client(b); | |
491 | } | |
492 | ||
4e2baf2f MV |
493 | static int bus_socket_write_auth(sd_bus *b) { |
494 | ssize_t k; | |
495 | ||
496 | assert(b); | |
497 | assert(b->state == BUS_AUTHENTICATING); | |
498 | ||
499 | if (!bus_socket_auth_needs_write(b)) | |
500 | return 0; | |
501 | ||
502 | if (b->prefer_writev) | |
503 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
504 | else { | |
505 | struct msghdr mh = { | |
506 | .msg_iov = b->auth_iovec + b->auth_index, | |
507 | .msg_iovlen = ELEMENTSOF(b->auth_iovec) - b->auth_index, | |
508 | }; | |
509 | ||
510 | k = sendmsg(b->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); | |
511 | if (k < 0 && errno == ENOTSOCK) { | |
512 | b->prefer_writev = true; | |
513 | k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); | |
514 | } | |
515 | } | |
516 | ||
517 | if (k < 0) | |
518 | return ERRNO_IS_TRANSIENT(errno) ? 0 : -errno; | |
519 | ||
520 | iovec_advance(b->auth_iovec, &b->auth_index, (size_t) k); | |
521 | ||
522 | /* Now crank the state machine since we might be able to make progress after writing. For example, | |
523 | * the server only processes "BEGIN" when the write buffer is empty. | |
524 | */ | |
525 | return bus_socket_auth_verify(b); | |
526 | } | |
527 | ||
a7e3212d LP |
528 | static int bus_socket_read_auth(sd_bus *b) { |
529 | struct msghdr mh; | |
7f4e6a1c | 530 | struct iovec iov = {}; |
a7e3212d LP |
531 | size_t n; |
532 | ssize_t k; | |
533 | int r; | |
534 | void *p; | |
fb29cdbe | 535 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)) control; |
15d5af81 | 536 | bool handle_cmsg = false; |
a7e3212d LP |
537 | |
538 | assert(b); | |
2181a7f5 | 539 | assert(b->state == BUS_AUTHENTICATING); |
a7e3212d LP |
540 | |
541 | r = bus_socket_auth_verify(b); | |
542 | if (r != 0) | |
543 | return r; | |
544 | ||
9607d947 | 545 | n = MAX(256u, b->rbuffer_size * 2); |
a7e3212d LP |
546 | |
547 | if (n > BUS_AUTH_SIZE_MAX) | |
548 | n = BUS_AUTH_SIZE_MAX; | |
549 | ||
550 | if (b->rbuffer_size >= n) | |
551 | return -ENOBUFS; | |
552 | ||
553 | p = realloc(b->rbuffer, n); | |
554 | if (!p) | |
555 | return -ENOMEM; | |
556 | ||
557 | b->rbuffer = p; | |
558 | ||
5cfa2c3d | 559 | iov = IOVEC_MAKE((uint8_t *)b->rbuffer + b->rbuffer_size, n - b->rbuffer_size); |
a7e3212d | 560 | |
c1093c34 | 561 | if (b->prefer_readv) { |
15d5af81 | 562 | k = readv(b->input_fd, &iov, 1); |
c1093c34 LP |
563 | if (k < 0) |
564 | k = -errno; | |
565 | } else { | |
41ab8c67 LP |
566 | mh = (struct msghdr) { |
567 | .msg_iov = &iov, | |
568 | .msg_iovlen = 1, | |
569 | .msg_control = &control, | |
570 | .msg_controllen = sizeof(control), | |
571 | }; | |
15d5af81 | 572 | |
3691bcf3 LP |
573 | k = recvmsg_safe(b->input_fd, &mh, MSG_DONTWAIT|MSG_CMSG_CLOEXEC); |
574 | if (k == -ENOTSOCK) { | |
15d5af81 LP |
575 | b->prefer_readv = true; |
576 | k = readv(b->input_fd, &iov, 1); | |
3691bcf3 LP |
577 | if (k < 0) |
578 | k = -errno; | |
15d5af81 LP |
579 | } else |
580 | handle_cmsg = true; | |
581 | } | |
b3d06b92 YW |
582 | if (k < 0) { |
583 | if (ERRNO_IS_TRANSIENT(k)) | |
584 | return 0; | |
3691bcf3 | 585 | return (int) k; |
b3d06b92 | 586 | } |
3691bcf3 LP |
587 | if (k == 0) { |
588 | if (handle_cmsg) | |
589 | cmsg_close_all(&mh); /* paranoia, we shouldn't have gotten any fds on EOF */ | |
a7e3212d | 590 | return -ECONNRESET; |
3691bcf3 | 591 | } |
a7e3212d LP |
592 | |
593 | b->rbuffer_size += k; | |
594 | ||
2a1288ff LP |
595 | if (handle_cmsg) { |
596 | struct cmsghdr *cmsg; | |
597 | ||
598 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
599 | if (cmsg->cmsg_level == SOL_SOCKET && |
600 | cmsg->cmsg_type == SCM_RIGHTS) { | |
601 | int j; | |
602 | ||
603 | /* Whut? We received fds during the auth | |
604 | * protocol? Somebody is playing games with | |
605 | * us. Close them all, and fail */ | |
606 | j = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
607 | close_many((int*) CMSG_DATA(cmsg), j); | |
608 | return -EIO; | |
d868f2a3 ZJS |
609 | } else |
610 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
611 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 612 | } |
2181a7f5 | 613 | |
a7e3212d LP |
614 | r = bus_socket_auth_verify(b); |
615 | if (r != 0) | |
616 | return r; | |
617 | ||
618 | return 1; | |
619 | } | |
620 | ||
8f04d2eb | 621 | void bus_socket_setup(sd_bus *b) { |
a7e3212d LP |
622 | assert(b); |
623 | ||
aec6d91f | 624 | /* Increase the buffers to 8 MB */ |
28e7e934 | 625 | (void) fd_increase_rxbuf(b->input_fd, SNDBUF_SIZE); |
6ae22ffb | 626 | (void) fd_inc_sndbuf(b->output_fd, SNDBUF_SIZE); |
a7e3212d | 627 | |
e1d337d4 | 628 | b->message_version = 1; |
0f437184 | 629 | b->message_endian = 0; |
8f04d2eb | 630 | } |
e1d337d4 | 631 | |
8f04d2eb | 632 | static void bus_get_peercred(sd_bus *b) { |
c4e6556c ZJS |
633 | int r; |
634 | ||
8f04d2eb | 635 | assert(b); |
18ac4643 LP |
636 | assert(!b->ucred_valid); |
637 | assert(!b->label); | |
f5fbe71d | 638 | assert(b->n_groups == SIZE_MAX); |
8f04d2eb LP |
639 | |
640 | /* Get the peer for socketpair() sockets */ | |
eff05270 | 641 | b->ucred_valid = getpeercred(b->input_fd, &b->ucred) >= 0; |
c4e6556c ZJS |
642 | |
643 | /* Get the SELinux context of the peer */ | |
db7d1dca | 644 | r = getpeersec(b->input_fd, &b->label); |
18ac4643 | 645 | if (r < 0 && !IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) |
db7d1dca | 646 | log_debug_errno(r, "Failed to determine peer security context: %m"); |
18ac4643 LP |
647 | |
648 | /* Get the list of auxiliary groups of the peer */ | |
649 | r = getpeergroups(b->input_fd, &b->groups); | |
c599b325 | 650 | if (r >= 0) |
18ac4643 | 651 | b->n_groups = (size_t) r; |
c599b325 ZJS |
652 | else if (!IN_SET(r, -EOPNOTSUPP, -ENOPROTOOPT)) |
653 | log_debug_errno(r, "Failed to determine peer's group list: %m"); | |
a7e3212d LP |
654 | } |
655 | ||
2181a7f5 | 656 | static int bus_socket_start_auth_client(sd_bus *b) { |
1ed4723d DR |
657 | static const char sasl_auth_anonymous[] = { |
658 | /* | |
659 | * We use an arbitrary trace-string for the ANONYMOUS authentication. It can be used by the | |
660 | * message broker to aid debugging of clients. We fully anonymize the connection and use a | |
661 | * static default. | |
662 | */ | |
347f4824 DR |
663 | /* HEX a n o n y m o u s */ |
664 | "\0AUTH ANONYMOUS 616e6f6e796d6f7573\r\n" | |
1ed4723d DR |
665 | }; |
666 | static const char sasl_auth_external[] = { | |
667 | "\0AUTH EXTERNAL\r\n" | |
668 | "DATA\r\n" | |
669 | }; | |
670 | static const char sasl_negotiate_unix_fd[] = { | |
671 | "NEGOTIATE_UNIX_FD\r\n" | |
672 | }; | |
673 | static const char sasl_begin[] = { | |
674 | "BEGIN\r\n" | |
675 | }; | |
676 | size_t i = 0; | |
a7e3212d LP |
677 | |
678 | assert(b); | |
679 | ||
1ed4723d DR |
680 | if (b->anonymous_auth) |
681 | b->auth_iovec[i++] = IOVEC_MAKE((char*) sasl_auth_anonymous, sizeof(sasl_auth_anonymous) - 1); | |
682 | else | |
683 | b->auth_iovec[i++] = IOVEC_MAKE((char*) sasl_auth_external, sizeof(sasl_auth_external) - 1); | |
a7e3212d | 684 | |
c7db1984 | 685 | if (b->accept_fd) |
1ed4723d | 686 | b->auth_iovec[i++] = IOVEC_MAKE_STRING(sasl_negotiate_unix_fd); |
a7e3212d | 687 | |
1ed4723d | 688 | b->auth_iovec[i++] = IOVEC_MAKE_STRING(sasl_begin); |
a7e3212d LP |
689 | |
690 | return bus_socket_write_auth(b); | |
691 | } | |
692 | ||
a7893c6b | 693 | int bus_socket_start_auth(sd_bus *b) { |
2181a7f5 LP |
694 | assert(b); |
695 | ||
8f04d2eb LP |
696 | bus_get_peercred(b); |
697 | ||
3e0e196e | 698 | bus_set_state(b, BUS_AUTHENTICATING); |
036d61b3 | 699 | b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_AUTH_TIMEOUT; |
2181a7f5 | 700 | |
9ab32f9d | 701 | if (sd_is_socket(b->input_fd, AF_UNIX, 0, 0) <= 0) |
c7db1984 | 702 | b->accept_fd = false; |
2181a7f5 | 703 | |
9ab32f9d LP |
704 | if (b->output_fd != b->input_fd) |
705 | if (sd_is_socket(b->output_fd, AF_UNIX, 0, 0) <= 0) | |
c7db1984 | 706 | b->accept_fd = false; |
e82c9509 | 707 | |
2181a7f5 LP |
708 | if (b->is_server) |
709 | return bus_socket_read_auth(b); | |
710 | else | |
711 | return bus_socket_start_auth_client(b); | |
712 | } | |
713 | ||
8a5cd31e LP |
714 | static int bus_socket_inotify_setup(sd_bus *b) { |
715 | _cleanup_free_ int *new_watches = NULL; | |
716 | _cleanup_free_ char *absolute = NULL; | |
319a4f4b | 717 | size_t n = 0, done = 0, i; |
8a5cd31e LP |
718 | unsigned max_follow = 32; |
719 | const char *p; | |
720 | int wd, r; | |
721 | ||
722 | assert(b); | |
723 | assert(b->watch_bind); | |
724 | assert(b->sockaddr.sa.sa_family == AF_UNIX); | |
725 | assert(b->sockaddr.un.sun_path[0] != 0); | |
726 | ||
727 | /* Sets up an inotify fd in case watch_bind is enabled: wait until the configured AF_UNIX file system socket | |
728 | * appears before connecting to it. The implemented is pretty simplistic: we just subscribe to relevant changes | |
729 | * to all prefix components of the path, and every time we get an event for that we try to reconnect again, | |
730 | * without actually caring what precisely the event we got told us. If we still can't connect we re-subscribe | |
731 | * to all relevant changes of anything in the path, so that our watches include any possibly newly created path | |
732 | * components. */ | |
733 | ||
734 | if (b->inotify_fd < 0) { | |
735 | b->inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
736 | if (b->inotify_fd < 0) | |
737 | return -errno; | |
7fe2903c LP |
738 | |
739 | b->inotify_fd = fd_move_above_stdio(b->inotify_fd); | |
8a5cd31e LP |
740 | } |
741 | ||
742 | /* Make sure the path is NUL terminated */ | |
2f82562b LP |
743 | p = strndupa_safe(b->sockaddr.un.sun_path, |
744 | sizeof(b->sockaddr.un.sun_path)); | |
8a5cd31e LP |
745 | |
746 | /* Make sure the path is absolute */ | |
747 | r = path_make_absolute_cwd(p, &absolute); | |
748 | if (r < 0) | |
749 | goto fail; | |
750 | ||
751 | /* Watch all parent directories, and don't mind any prefix that doesn't exist yet. For the innermost directory | |
752 | * that exists we want to know when files are created or moved into it. For all parents of it we just care if | |
753 | * they are removed or renamed. */ | |
754 | ||
319a4f4b | 755 | if (!GREEDY_REALLOC(new_watches, n + 1)) { |
8a5cd31e LP |
756 | r = -ENOMEM; |
757 | goto fail; | |
758 | } | |
759 | ||
760 | /* Start with the top-level directory, which is a bit simpler than the rest, since it can't be a symlink, and | |
761 | * always exists */ | |
762 | wd = inotify_add_watch(b->inotify_fd, "/", IN_CREATE|IN_MOVED_TO); | |
763 | if (wd < 0) { | |
764 | r = log_debug_errno(errno, "Failed to add inotify watch on /: %m"); | |
765 | goto fail; | |
766 | } else | |
767 | new_watches[n++] = wd; | |
768 | ||
769 | for (;;) { | |
770 | _cleanup_free_ char *component = NULL, *prefix = NULL, *destination = NULL; | |
771 | size_t n_slashes, n_component; | |
772 | char *c = NULL; | |
773 | ||
774 | n_slashes = strspn(absolute + done, "/"); | |
775 | n_component = n_slashes + strcspn(absolute + done + n_slashes, "/"); | |
776 | ||
777 | if (n_component == 0) /* The end */ | |
778 | break; | |
779 | ||
780 | component = strndup(absolute + done, n_component); | |
781 | if (!component) { | |
782 | r = -ENOMEM; | |
783 | goto fail; | |
784 | } | |
785 | ||
786 | /* A trailing slash? That's a directory, and not a socket then */ | |
787 | if (path_equal(component, "/")) { | |
788 | r = -EISDIR; | |
789 | goto fail; | |
790 | } | |
791 | ||
792 | /* A single dot? Let's eat this up */ | |
793 | if (path_equal(component, "/.")) { | |
794 | done += n_component; | |
795 | continue; | |
796 | } | |
797 | ||
798 | prefix = strndup(absolute, done + n_component); | |
799 | if (!prefix) { | |
800 | r = -ENOMEM; | |
801 | goto fail; | |
802 | } | |
803 | ||
319a4f4b | 804 | if (!GREEDY_REALLOC(new_watches, n + 1)) { |
8a5cd31e LP |
805 | r = -ENOMEM; |
806 | goto fail; | |
807 | } | |
808 | ||
809 | wd = inotify_add_watch(b->inotify_fd, prefix, IN_DELETE_SELF|IN_MOVE_SELF|IN_ATTRIB|IN_CREATE|IN_MOVED_TO|IN_DONT_FOLLOW); | |
810 | log_debug("Added inotify watch for %s on bus %s: %i", prefix, strna(b->description), wd); | |
811 | ||
812 | if (wd < 0) { | |
813 | if (IN_SET(errno, ENOENT, ELOOP)) | |
814 | break; /* This component doesn't exist yet, or the path contains a cyclic symlink right now */ | |
815 | ||
945403e6 | 816 | r = log_debug_errno(errno, "Failed to add inotify watch on %s: %m", empty_to_root(prefix)); |
8a5cd31e LP |
817 | goto fail; |
818 | } else | |
819 | new_watches[n++] = wd; | |
820 | ||
821 | /* Check if this is possibly a symlink. If so, let's follow it and watch it too. */ | |
822 | r = readlink_malloc(prefix, &destination); | |
823 | if (r == -EINVAL) { /* not a symlink */ | |
824 | done += n_component; | |
825 | continue; | |
826 | } | |
827 | if (r < 0) | |
828 | goto fail; | |
829 | ||
830 | if (isempty(destination)) { /* Empty symlink target? Yuck! */ | |
831 | r = -EINVAL; | |
832 | goto fail; | |
833 | } | |
834 | ||
835 | if (max_follow <= 0) { /* Let's make sure we don't follow symlinks forever */ | |
836 | r = -ELOOP; | |
837 | goto fail; | |
838 | } | |
839 | ||
840 | if (path_is_absolute(destination)) { | |
841 | /* For absolute symlinks we build the new path and start anew */ | |
842 | c = strjoin(destination, absolute + done + n_component); | |
843 | done = 0; | |
844 | } else { | |
845 | _cleanup_free_ char *t = NULL; | |
846 | ||
847 | /* For relative symlinks we replace the last component, and try again */ | |
848 | t = strndup(absolute, done); | |
849 | if (!t) | |
850 | return -ENOMEM; | |
851 | ||
852 | c = strjoin(t, "/", destination, absolute + done + n_component); | |
853 | } | |
854 | if (!c) { | |
855 | r = -ENOMEM; | |
856 | goto fail; | |
857 | } | |
858 | ||
859 | free(absolute); | |
860 | absolute = c; | |
861 | ||
862 | max_follow--; | |
863 | } | |
864 | ||
865 | /* And now, let's remove all watches from the previous iteration we don't need anymore */ | |
866 | for (i = 0; i < b->n_inotify_watches; i++) { | |
867 | bool found = false; | |
868 | size_t j; | |
869 | ||
870 | for (j = 0; j < n; j++) | |
871 | if (new_watches[j] == b->inotify_watches[i]) { | |
872 | found = true; | |
873 | break; | |
874 | } | |
875 | ||
876 | if (found) | |
877 | continue; | |
878 | ||
879 | (void) inotify_rm_watch(b->inotify_fd, b->inotify_watches[i]); | |
880 | } | |
881 | ||
882 | free_and_replace(b->inotify_watches, new_watches); | |
883 | b->n_inotify_watches = n; | |
884 | ||
885 | return 0; | |
886 | ||
887 | fail: | |
888 | bus_close_inotify_fd(b); | |
889 | return r; | |
890 | } | |
891 | ||
a7e3212d | 892 | int bus_socket_connect(sd_bus *b) { |
8a5cd31e | 893 | bool inotify_done = false; |
a7e3212d LP |
894 | int r; |
895 | ||
896 | assert(b); | |
a7e3212d | 897 | |
8a5cd31e LP |
898 | for (;;) { |
899 | assert(b->input_fd < 0); | |
900 | assert(b->output_fd < 0); | |
901 | assert(b->sockaddr.sa.sa_family != AF_UNSPEC); | |
a7e3212d | 902 | |
165fee86 ZJS |
903 | if (DEBUG_LOGGING) { |
904 | _cleanup_free_ char *pretty = NULL; | |
905 | (void) sockaddr_pretty(&b->sockaddr.sa, b->sockaddr_size, false, true, &pretty); | |
906 | log_debug("sd-bus: starting bus%s%s by connecting to %s...", | |
907 | b->description ? " " : "", strempty(b->description), strnull(pretty)); | |
908 | } | |
909 | ||
8a5cd31e LP |
910 | b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
911 | if (b->input_fd < 0) | |
912 | return -errno; | |
e82c9509 | 913 | |
7fe2903c LP |
914 | b->input_fd = fd_move_above_stdio(b->input_fd); |
915 | ||
8a5cd31e LP |
916 | b->output_fd = b->input_fd; |
917 | bus_socket_setup(b); | |
a7e3212d | 918 | |
8a5cd31e LP |
919 | if (connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size) < 0) { |
920 | if (errno == EINPROGRESS) { | |
a7e3212d | 921 | |
8a5cd31e LP |
922 | /* If we have any inotify watches open, close them now, we don't need them anymore, as |
923 | * we have successfully initiated a connection */ | |
924 | bus_close_inotify_fd(b); | |
925 | ||
926 | /* Note that very likely we are already in BUS_OPENING state here, as we enter it when | |
927 | * we start parsing the address string. The only reason we set the state explicitly | |
928 | * here, is to undo BUS_WATCH_BIND, in case we did the inotify magic. */ | |
3e0e196e | 929 | bus_set_state(b, BUS_OPENING); |
8a5cd31e LP |
930 | return 1; |
931 | } | |
932 | ||
933 | if (IN_SET(errno, ENOENT, ECONNREFUSED) && /* ENOENT → unix socket doesn't exist at all; ECONNREFUSED → unix socket stale */ | |
934 | b->watch_bind && | |
935 | b->sockaddr.sa.sa_family == AF_UNIX && | |
936 | b->sockaddr.un.sun_path[0] != 0) { | |
937 | ||
938 | /* This connection attempt failed, let's release the socket for now, and start with a | |
939 | * fresh one when reconnecting. */ | |
940 | bus_close_io_fds(b); | |
941 | ||
942 | if (inotify_done) { | |
943 | /* inotify set up already, don't do it again, just return now, and remember | |
944 | * that we are waiting for inotify events now. */ | |
3e0e196e | 945 | bus_set_state(b, BUS_WATCH_BIND); |
8a5cd31e LP |
946 | return 1; |
947 | } | |
948 | ||
949 | /* This is a file system socket, and the inotify logic is enabled. Let's create the necessary inotify fd. */ | |
950 | r = bus_socket_inotify_setup(b); | |
951 | if (r < 0) | |
952 | return r; | |
953 | ||
954 | /* Let's now try to connect a second time, because in theory there's otherwise a race | |
955 | * here: the socket might have been created in the time between our first connect() and | |
956 | * the time we set up the inotify logic. But let's remember that we set up inotify now, | |
957 | * so that we don't do the connect() more than twice. */ | |
958 | inotify_done = true; | |
959 | ||
960 | } else | |
961 | return -errno; | |
962 | } else | |
963 | break; | |
a7e3212d LP |
964 | } |
965 | ||
8a5cd31e LP |
966 | /* Yay, established, we don't need no inotify anymore! */ |
967 | bus_close_inotify_fd(b); | |
968 | ||
a7e3212d LP |
969 | return bus_socket_start_auth(b); |
970 | } | |
971 | ||
972 | int bus_socket_exec(sd_bus *b) { | |
e82c9509 | 973 | int s[2], r; |
a7e3212d LP |
974 | |
975 | assert(b); | |
e82c9509 LP |
976 | assert(b->input_fd < 0); |
977 | assert(b->output_fd < 0); | |
a7e3212d | 978 | assert(b->exec_path); |
392cf1d0 | 979 | assert(b->busexec_pid == 0); |
a7e3212d | 980 | |
87fa2e21 ZJS |
981 | if (DEBUG_LOGGING) { |
982 | _cleanup_free_ char *line = NULL; | |
983 | ||
984 | if (b->exec_argv) | |
4ef15008 | 985 | line = quote_command_line(b->exec_argv, SHELL_ESCAPE_EMPTY); |
87fa2e21 ZJS |
986 | |
987 | log_debug("sd-bus: starting bus%s%s with %s%s", | |
988 | b->description ? " " : "", strempty(b->description), | |
989 | line ?: b->exec_path, | |
990 | b->exec_argv && !line ? "…" : ""); | |
991 | } | |
165fee86 | 992 | |
e82c9509 LP |
993 | r = socketpair(AF_UNIX, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, s); |
994 | if (r < 0) | |
a7e3212d LP |
995 | return -errno; |
996 | ||
911f8f01 YW |
997 | r = safe_fork_full("(sd-busexec)", |
998 | NULL, | |
999 | s+1, 1, | |
1000 | FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE, &b->busexec_pid); | |
4c253ed1 | 1001 | if (r < 0) { |
3d94f76c | 1002 | safe_close_pair(s); |
4c253ed1 | 1003 | return r; |
a7e3212d | 1004 | } |
4c253ed1 | 1005 | if (r == 0) { |
a7e3212d LP |
1006 | /* Child */ |
1007 | ||
aedec452 LP |
1008 | r = rearrange_stdio(s[1], s[1], STDERR_FILENO); |
1009 | TAKE_FD(s[1]); | |
1010 | if (r < 0) | |
2b33ab09 | 1011 | _exit(EXIT_FAILURE); |
a7e3212d | 1012 | |
a7e3212d LP |
1013 | if (b->exec_argv) |
1014 | execvp(b->exec_path, b->exec_argv); | |
87fa2e21 ZJS |
1015 | else |
1016 | execvp(b->exec_path, STRV_MAKE(b->exec_path)); | |
a7e3212d LP |
1017 | |
1018 | _exit(EXIT_FAILURE); | |
1019 | } | |
1020 | ||
03e334a1 | 1021 | safe_close(s[1]); |
7fe2903c | 1022 | b->output_fd = b->input_fd = fd_move_above_stdio(s[0]); |
a7e3212d | 1023 | |
8f04d2eb | 1024 | bus_socket_setup(b); |
e1d337d4 | 1025 | |
a7e3212d LP |
1026 | return bus_socket_start_auth(b); |
1027 | } | |
1028 | ||
1029 | int bus_socket_take_fd(sd_bus *b) { | |
a7e3212d LP |
1030 | assert(b); |
1031 | ||
8f04d2eb | 1032 | bus_socket_setup(b); |
a7e3212d LP |
1033 | |
1034 | return bus_socket_start_auth(b); | |
1035 | } | |
1036 | ||
1037 | int bus_socket_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) { | |
a7e3212d LP |
1038 | struct iovec *iov; |
1039 | ssize_t k; | |
1040 | size_t n; | |
1041 | unsigned j; | |
bc7fd8cd | 1042 | int r; |
a7e3212d LP |
1043 | |
1044 | assert(bus); | |
1045 | assert(m); | |
1046 | assert(idx); | |
945c2931 | 1047 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 1048 | |
6629161f | 1049 | if (*idx >= BUS_MESSAGE_SIZE(m)) |
a7e3212d | 1050 | return 0; |
a7e3212d | 1051 | |
bc7fd8cd LP |
1052 | r = bus_message_setup_iovec(m); |
1053 | if (r < 0) | |
1054 | return r; | |
2100fa10 | 1055 | |
a7e3212d | 1056 | n = m->n_iovec * sizeof(struct iovec); |
6e9417f5 | 1057 | iov = newa(struct iovec, n); |
75f32f04 | 1058 | memcpy_safe(iov, m->iovec, n); |
a7e3212d LP |
1059 | |
1060 | j = 0; | |
1061 | iovec_advance(iov, &j, *idx); | |
1062 | ||
15d5af81 LP |
1063 | if (bus->prefer_writev) |
1064 | k = writev(bus->output_fd, iov, m->n_iovec); | |
1065 | else { | |
7f4e6a1c ZJS |
1066 | struct msghdr mh = { |
1067 | .msg_iov = iov, | |
1068 | .msg_iovlen = m->n_iovec, | |
1069 | }; | |
15d5af81 | 1070 | |
f29eef2e | 1071 | if (m->n_fds > 0 && *idx == 0) { |
15d5af81 | 1072 | struct cmsghdr *control; |
15d5af81 | 1073 | |
a258f491 LP |
1074 | mh.msg_controllen = CMSG_SPACE(sizeof(int) * m->n_fds); |
1075 | mh.msg_control = alloca0(mh.msg_controllen); | |
1076 | control = CMSG_FIRSTHDR(&mh); | |
1077 | control->cmsg_len = CMSG_LEN(sizeof(int) * m->n_fds); | |
15d5af81 LP |
1078 | control->cmsg_level = SOL_SOCKET; |
1079 | control->cmsg_type = SCM_RIGHTS; | |
15d5af81 LP |
1080 | memcpy(CMSG_DATA(control), m->fds, sizeof(int) * m->n_fds); |
1081 | } | |
1082 | ||
15d5af81 LP |
1083 | k = sendmsg(bus->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); |
1084 | if (k < 0 && errno == ENOTSOCK) { | |
1085 | bus->prefer_writev = true; | |
1086 | k = writev(bus->output_fd, iov, m->n_iovec); | |
1087 | } | |
1088 | } | |
a7e3212d | 1089 | |
a7e3212d | 1090 | if (k < 0) |
b3d06b92 | 1091 | return ERRNO_IS_TRANSIENT(errno) ? 0 : -errno; |
a7e3212d LP |
1092 | |
1093 | *idx += (size_t) k; | |
1094 | return 1; | |
1095 | } | |
1096 | ||
1097 | static int bus_socket_read_message_need(sd_bus *bus, size_t *need) { | |
1098 | uint32_t a, b; | |
1099 | uint8_t e; | |
1100 | uint64_t sum; | |
1101 | ||
1102 | assert(bus); | |
1103 | assert(need); | |
945c2931 | 1104 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1105 | |
1106 | if (bus->rbuffer_size < sizeof(struct bus_header)) { | |
1107 | *need = sizeof(struct bus_header) + 8; | |
1108 | ||
1109 | /* Minimum message size: | |
1110 | * | |
1111 | * Header + | |
1112 | * | |
1113 | * Method Call: +2 string headers | |
1114 | * Signal: +3 string headers | |
1115 | * Method Error: +1 string headers | |
1116 | * +1 uint32 headers | |
1117 | * Method Reply: +1 uint32 headers | |
1118 | * | |
1119 | * A string header is at least 9 bytes | |
1120 | * A uint32 header is at least 8 bytes | |
1121 | * | |
1122 | * Hence the minimum message size of a valid message | |
1123 | * is header + 8 bytes */ | |
1124 | ||
1125 | return 0; | |
1126 | } | |
1127 | ||
1128 | a = ((const uint32_t*) bus->rbuffer)[1]; | |
1129 | b = ((const uint32_t*) bus->rbuffer)[3]; | |
1130 | ||
1131 | e = ((const uint8_t*) bus->rbuffer)[0]; | |
0461f8cd | 1132 | if (e == BUS_LITTLE_ENDIAN) { |
a7e3212d LP |
1133 | a = le32toh(a); |
1134 | b = le32toh(b); | |
0461f8cd | 1135 | } else if (e == BUS_BIG_ENDIAN) { |
a7e3212d LP |
1136 | a = be32toh(a); |
1137 | b = be32toh(b); | |
1138 | } else | |
1139 | return -EBADMSG; | |
1140 | ||
dc7be332 | 1141 | sum = (uint64_t) sizeof(struct bus_header) + (uint64_t) ALIGN8(b) + (uint64_t) a; |
a7e3212d LP |
1142 | if (sum >= BUS_MESSAGE_SIZE_MAX) |
1143 | return -ENOBUFS; | |
1144 | ||
1145 | *need = (size_t) sum; | |
1146 | return 0; | |
1147 | } | |
1148 | ||
7d22c717 | 1149 | static int bus_socket_make_message(sd_bus *bus, size_t size) { |
6d586a13 | 1150 | sd_bus_message *t = NULL; |
a7e3212d LP |
1151 | void *b; |
1152 | int r; | |
1153 | ||
1154 | assert(bus); | |
a7e3212d | 1155 | assert(bus->rbuffer_size >= size); |
945c2931 | 1156 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d | 1157 | |
7adc46fc LP |
1158 | r = bus_rqueue_make_room(bus); |
1159 | if (r < 0) | |
1160 | return r; | |
1161 | ||
a7e3212d LP |
1162 | if (bus->rbuffer_size > size) { |
1163 | b = memdup((const uint8_t*) bus->rbuffer + size, | |
1164 | bus->rbuffer_size - size); | |
1165 | if (!b) | |
1166 | return -ENOMEM; | |
1167 | } else | |
1168 | b = NULL; | |
1169 | ||
df2d202e LP |
1170 | r = bus_message_from_malloc(bus, |
1171 | bus->rbuffer, size, | |
a7e3212d | 1172 | bus->fds, bus->n_fds, |
038f9863 | 1173 | NULL, |
a7e3212d | 1174 | &t); |
3dec5201 | 1175 | if (r == -EBADMSG) { |
6d586a13 | 1176 | log_debug_errno(r, "Received invalid message from connection %s, dropping.", strna(bus->description)); |
3dec5201 ZJS |
1177 | free(bus->rbuffer); /* We want to drop current rbuffer and proceed with whatever remains in b */ |
1178 | } else if (r < 0) { | |
a7e3212d LP |
1179 | free(b); |
1180 | return r; | |
1181 | } | |
1182 | ||
3dec5201 | 1183 | /* rbuffer ownership was either transferred to t, or we got EBADMSG and dropped it. */ |
a7e3212d LP |
1184 | bus->rbuffer = b; |
1185 | bus->rbuffer_size -= size; | |
1186 | ||
1187 | bus->fds = NULL; | |
1188 | bus->n_fds = 0; | |
1189 | ||
c1757a70 | 1190 | if (t) { |
f1617a3b | 1191 | t->read_counter = ++bus->read_counter; |
c1757a70 LP |
1192 | bus->rqueue[bus->rqueue_size++] = bus_message_ref_queued(t, bus); |
1193 | sd_bus_message_unref(t); | |
1194 | } | |
7d22c717 | 1195 | |
a7e3212d LP |
1196 | return 1; |
1197 | } | |
1198 | ||
7d22c717 | 1199 | int bus_socket_read_message(sd_bus *bus) { |
a7e3212d | 1200 | struct msghdr mh; |
7f4e6a1c | 1201 | struct iovec iov = {}; |
a7e3212d LP |
1202 | ssize_t k; |
1203 | size_t need; | |
1204 | int r; | |
1205 | void *b; | |
fb29cdbe | 1206 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)) control; |
4d3a5b10 | 1207 | bool handle_cmsg = false; |
a7e3212d LP |
1208 | |
1209 | assert(bus); | |
945c2931 | 1210 | assert(IN_SET(bus->state, BUS_RUNNING, BUS_HELLO)); |
a7e3212d LP |
1211 | |
1212 | r = bus_socket_read_message_need(bus, &need); | |
1213 | if (r < 0) | |
1214 | return r; | |
1215 | ||
1216 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1217 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1218 | |
1219 | b = realloc(bus->rbuffer, need); | |
1220 | if (!b) | |
1221 | return -ENOMEM; | |
1222 | ||
1223 | bus->rbuffer = b; | |
1224 | ||
5cfa2c3d | 1225 | iov = IOVEC_MAKE((uint8_t *)bus->rbuffer + bus->rbuffer_size, need - bus->rbuffer_size); |
a7e3212d | 1226 | |
c1093c34 | 1227 | if (bus->prefer_readv) { |
15d5af81 | 1228 | k = readv(bus->input_fd, &iov, 1); |
c1093c34 LP |
1229 | if (k < 0) |
1230 | k = -errno; | |
1231 | } else { | |
41ab8c67 LP |
1232 | mh = (struct msghdr) { |
1233 | .msg_iov = &iov, | |
1234 | .msg_iovlen = 1, | |
1235 | .msg_control = &control, | |
1236 | .msg_controllen = sizeof(control), | |
1237 | }; | |
15d5af81 | 1238 | |
3691bcf3 LP |
1239 | k = recvmsg_safe(bus->input_fd, &mh, MSG_DONTWAIT|MSG_CMSG_CLOEXEC); |
1240 | if (k == -ENOTSOCK) { | |
15d5af81 LP |
1241 | bus->prefer_readv = true; |
1242 | k = readv(bus->input_fd, &iov, 1); | |
3691bcf3 LP |
1243 | if (k < 0) |
1244 | k = -errno; | |
15d5af81 LP |
1245 | } else |
1246 | handle_cmsg = true; | |
1247 | } | |
b3d06b92 YW |
1248 | if (k < 0) { |
1249 | if (ERRNO_IS_TRANSIENT(k)) | |
1250 | return 0; | |
3691bcf3 | 1251 | return (int) k; |
b3d06b92 | 1252 | } |
3691bcf3 LP |
1253 | if (k == 0) { |
1254 | if (handle_cmsg) | |
1255 | cmsg_close_all(&mh); /* On EOF we shouldn't have gotten an fd, but let's make sure */ | |
a7e3212d | 1256 | return -ECONNRESET; |
3691bcf3 | 1257 | } |
a7e3212d LP |
1258 | |
1259 | bus->rbuffer_size += k; | |
1260 | ||
2a1288ff LP |
1261 | if (handle_cmsg) { |
1262 | struct cmsghdr *cmsg; | |
1263 | ||
1264 | CMSG_FOREACH(cmsg, &mh) | |
15d5af81 LP |
1265 | if (cmsg->cmsg_level == SOL_SOCKET && |
1266 | cmsg->cmsg_type == SCM_RIGHTS) { | |
7fe2903c | 1267 | int n, *f, i; |
15d5af81 LP |
1268 | |
1269 | n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); | |
1270 | ||
1271 | if (!bus->can_fds) { | |
1272 | /* Whut? We received fds but this | |
1273 | * isn't actually enabled? Close them, | |
1274 | * and fail */ | |
1275 | ||
1276 | close_many((int*) CMSG_DATA(cmsg), n); | |
1277 | return -EIO; | |
1278 | } | |
1279 | ||
62d74c78 | 1280 | f = reallocarray(bus->fds, bus->n_fds + n, sizeof(int)); |
15d5af81 LP |
1281 | if (!f) { |
1282 | close_many((int*) CMSG_DATA(cmsg), n); | |
1283 | return -ENOMEM; | |
1284 | } | |
1285 | ||
7fe2903c LP |
1286 | for (i = 0; i < n; i++) |
1287 | f[bus->n_fds++] = fd_move_above_stdio(((int*) CMSG_DATA(cmsg))[i]); | |
15d5af81 | 1288 | bus->fds = f; |
d868f2a3 ZJS |
1289 | } else |
1290 | log_debug("Got unexpected auxiliary data with level=%d and type=%d", | |
1291 | cmsg->cmsg_level, cmsg->cmsg_type); | |
2a1288ff | 1292 | } |
a7e3212d LP |
1293 | |
1294 | r = bus_socket_read_message_need(bus, &need); | |
1295 | if (r < 0) | |
1296 | return r; | |
1297 | ||
1298 | if (bus->rbuffer_size >= need) | |
7d22c717 | 1299 | return bus_socket_make_message(bus, need); |
a7e3212d LP |
1300 | |
1301 | return 1; | |
1302 | } | |
1303 | ||
1304 | int bus_socket_process_opening(sd_bus *b) { | |
0f2d351f | 1305 | int error = 0, events, r; |
a7e3212d | 1306 | socklen_t slen = sizeof(error); |
a7e3212d | 1307 | |
a7e3212d LP |
1308 | assert(b->state == BUS_OPENING); |
1309 | ||
0f2d351f | 1310 | events = fd_wait_for_event(b->output_fd, POLLOUT, 0); |
3022916b LP |
1311 | if (events < 0) { |
1312 | if (ERRNO_IS_TRANSIENT(events)) | |
1313 | return 0; | |
0f2d351f | 1314 | return events; |
3022916b | 1315 | } |
0f2d351f | 1316 | if (!(events & (POLLOUT|POLLERR|POLLHUP))) |
a7e3212d LP |
1317 | return 0; |
1318 | ||
e82c9509 | 1319 | r = getsockopt(b->output_fd, SOL_SOCKET, SO_ERROR, &error, &slen); |
a7e3212d LP |
1320 | if (r < 0) |
1321 | b->last_connect_error = errno; | |
1322 | else if (error != 0) | |
1323 | b->last_connect_error = error; | |
0f2d351f | 1324 | else if (events & (POLLERR|POLLHUP)) |
a7e3212d LP |
1325 | b->last_connect_error = ECONNREFUSED; |
1326 | else | |
1327 | return bus_socket_start_auth(b); | |
1328 | ||
1329 | return bus_next_address(b); | |
1330 | } | |
1331 | ||
1332 | int bus_socket_process_authenticating(sd_bus *b) { | |
1333 | int r; | |
1334 | ||
1335 | assert(b); | |
1336 | assert(b->state == BUS_AUTHENTICATING); | |
1337 | ||
1338 | if (now(CLOCK_MONOTONIC) >= b->auth_timeout) | |
1339 | return -ETIMEDOUT; | |
1340 | ||
1341 | r = bus_socket_write_auth(b); | |
1342 | if (r != 0) | |
1343 | return r; | |
1344 | ||
1345 | return bus_socket_read_auth(b); | |
1346 | } | |
8a5cd31e LP |
1347 | |
1348 | int bus_socket_process_watch_bind(sd_bus *b) { | |
1349 | int r, q; | |
1350 | ||
1351 | assert(b); | |
1352 | assert(b->state == BUS_WATCH_BIND); | |
1353 | assert(b->inotify_fd >= 0); | |
1354 | ||
1355 | r = flush_fd(b->inotify_fd); | |
1356 | if (r <= 0) | |
1357 | return r; | |
1358 | ||
1359 | log_debug("Got inotify event on bus %s.", strna(b->description)); | |
1360 | ||
1361 | /* We flushed events out of the inotify fd. In that case, maybe the socket is valid now? Let's try to connect | |
1362 | * to it again */ | |
1363 | ||
1364 | r = bus_socket_connect(b); | |
1365 | if (r < 0) | |
1366 | return r; | |
1367 | ||
1368 | q = bus_attach_io_events(b); | |
1369 | if (q < 0) | |
1370 | return q; | |
1371 | ||
1372 | q = bus_attach_inotify_event(b); | |
1373 | if (q < 0) | |
1374 | return q; | |
1375 | ||
1376 | return r; | |
1377 | } |