Commit | Line | Data |
---|---|---|
60b6c79c MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | * | |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
60b6c79c MD |
8 | * |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
d14d33bf | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
60b6c79c MD |
12 | * more details. |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
60b6c79c MD |
17 | */ |
18 | ||
19 | #define _GNU_SOURCE | |
6c1c0768 | 20 | #define _LGPL_SOURCE |
60b6c79c MD |
21 | #include <errno.h> |
22 | #include <limits.h> | |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <sys/wait.h> | |
27 | #include <sys/types.h> | |
28 | #include <sys/stat.h> | |
29 | #include <unistd.h> | |
30 | #include <fcntl.h> | |
c2b75c49 | 31 | #include <sched.h> |
730389d9 | 32 | #include <sys/signal.h> |
60b6c79c | 33 | |
90e535ef | 34 | #include <common/common.h> |
3fd15a74 | 35 | #include <common/utils.h> |
e8fa9fb0 | 36 | #include <common/compat/getenv.h> |
7567352f | 37 | #include <common/sessiond-comm/unix.h> |
60b6c79c | 38 | |
0857097f DG |
39 | #include "runas.h" |
40 | ||
7567352f MD |
41 | struct run_as_data; |
42 | typedef int (*run_as_fct)(struct run_as_data *data); | |
c2b75c49 | 43 | |
e11d277b | 44 | struct run_as_mkdir_data { |
7567352f | 45 | char path[PATH_MAX]; |
60b6c79c MD |
46 | mode_t mode; |
47 | }; | |
48 | ||
e11d277b | 49 | struct run_as_open_data { |
7567352f | 50 | char path[PATH_MAX]; |
60b6c79c MD |
51 | int flags; |
52 | mode_t mode; | |
53 | }; | |
54 | ||
4628484a | 55 | struct run_as_unlink_data { |
7567352f | 56 | char path[PATH_MAX]; |
4628484a MD |
57 | }; |
58 | ||
7567352f MD |
59 | struct run_as_rmdir_recursive_data { |
60 | char path[PATH_MAX]; | |
61 | }; | |
62 | ||
63 | enum run_as_cmd { | |
64 | RUN_AS_MKDIR, | |
65 | RUN_AS_OPEN, | |
66 | RUN_AS_UNLINK, | |
67 | RUN_AS_RMDIR_RECURSIVE, | |
68 | RUN_AS_MKDIR_RECURSIVE, | |
69 | }; | |
70 | ||
71 | struct run_as_data { | |
72 | enum run_as_cmd cmd; | |
73 | union { | |
74 | struct run_as_mkdir_data mkdir; | |
75 | struct run_as_open_data open; | |
76 | struct run_as_unlink_data unlink; | |
77 | struct run_as_rmdir_recursive_data rmdir_recursive; | |
78 | } u; | |
79 | uid_t uid; | |
80 | gid_t gid; | |
4628484a MD |
81 | }; |
82 | ||
df5b86c8 MD |
83 | struct run_as_ret { |
84 | int ret; | |
85 | int _errno; | |
86 | }; | |
87 | ||
7567352f MD |
88 | struct run_as_worker { |
89 | pid_t pid; /* Worker PID. */ | |
90 | int sockpair[2]; | |
91 | char *procname; | |
92 | }; | |
93 | ||
94 | /* Single global worker per process (for now). */ | |
95 | static struct run_as_worker *global_worker; | |
96 | /* Lock protecting the worker. */ | |
97 | static pthread_mutex_t worker_lock = PTHREAD_MUTEX_INITIALIZER; | |
98 | ||
8f0044bf MD |
99 | #ifdef VALGRIND |
100 | static | |
101 | int use_clone(void) | |
102 | { | |
103 | return 0; | |
104 | } | |
105 | #else | |
106 | static | |
107 | int use_clone(void) | |
108 | { | |
e8fa9fb0 | 109 | return !lttng_secure_getenv("LTTNG_DEBUG_NOCLONE"); |
8f0044bf MD |
110 | } |
111 | #endif | |
112 | ||
d77dded2 JG |
113 | LTTNG_HIDDEN |
114 | int _utils_mkdir_recursive_unsafe(const char *path, mode_t mode); | |
115 | ||
60b6c79c MD |
116 | /* |
117 | * Create recursively directory using the FULL path. | |
118 | */ | |
119 | static | |
7567352f | 120 | int _mkdir_recursive(struct run_as_data *data) |
60b6c79c | 121 | { |
60b6c79c | 122 | const char *path; |
60b6c79c | 123 | mode_t mode; |
60b6c79c | 124 | |
7567352f MD |
125 | path = data->u.mkdir.path; |
126 | mode = data->u.mkdir.mode; | |
60b6c79c | 127 | |
d77dded2 JG |
128 | /* Safe to call as we have transitioned to the requested uid/gid. */ |
129 | return _utils_mkdir_recursive_unsafe(path, mode); | |
60b6c79c MD |
130 | } |
131 | ||
132 | static | |
7567352f | 133 | int _mkdir(struct run_as_data *data) |
60b6c79c | 134 | { |
7567352f MD |
135 | return mkdir(data->u.mkdir.path, data->u.mkdir.mode); |
136 | } | |
7ce36756 | 137 | |
7567352f MD |
138 | static |
139 | int _open(struct run_as_data *data) | |
140 | { | |
141 | return open(data->u.open.path, data->u.open.flags, data->u.open.mode); | |
142 | } | |
143 | ||
144 | static | |
145 | int _unlink(struct run_as_data *data) | |
146 | { | |
147 | return unlink(data->u.unlink.path); | |
60b6c79c MD |
148 | } |
149 | ||
150 | static | |
7567352f | 151 | int _rmdir_recursive(struct run_as_data *data) |
60b6c79c | 152 | { |
7567352f MD |
153 | return utils_recursive_rmdir(data->u.rmdir_recursive.path); |
154 | } | |
df5b86c8 | 155 | |
7567352f MD |
156 | static |
157 | run_as_fct run_as_enum_to_fct(enum run_as_cmd cmd) | |
158 | { | |
159 | switch (cmd) { | |
160 | case RUN_AS_MKDIR: | |
161 | return _mkdir; | |
162 | case RUN_AS_OPEN: | |
163 | return _open; | |
164 | case RUN_AS_UNLINK: | |
165 | return _unlink; | |
166 | case RUN_AS_RMDIR_RECURSIVE: | |
167 | return _rmdir_recursive; | |
168 | case RUN_AS_MKDIR_RECURSIVE: | |
169 | return _mkdir_recursive; | |
170 | default: | |
171 | ERR("Unknown command %d", (int) cmd) | |
172 | return NULL; | |
173 | } | |
60b6c79c MD |
174 | } |
175 | ||
4628484a | 176 | static |
7567352f MD |
177 | int do_send_fd(struct run_as_worker *worker, |
178 | enum run_as_cmd cmd, int fd) | |
4628484a | 179 | { |
7567352f | 180 | ssize_t len; |
4628484a | 181 | |
7567352f MD |
182 | switch (cmd) { |
183 | case RUN_AS_OPEN: | |
184 | break; | |
185 | default: | |
186 | return 0; | |
187 | } | |
188 | if (fd < 0) { | |
189 | return 0; | |
190 | } | |
191 | len = lttcomm_send_fds_unix_sock(worker->sockpair[1], &fd, 1); | |
192 | if (len < 0) { | |
193 | PERROR("lttcomm_send_fds_unix_sock"); | |
194 | return -1; | |
195 | } | |
196 | if (close(fd) < 0) { | |
197 | PERROR("close"); | |
198 | return -1; | |
199 | } | |
200 | return 0; | |
4628484a MD |
201 | } |
202 | ||
203 | static | |
7567352f MD |
204 | int do_recv_fd(struct run_as_worker *worker, |
205 | enum run_as_cmd cmd, int *fd) | |
4628484a | 206 | { |
7567352f | 207 | ssize_t len; |
4628484a | 208 | |
7567352f MD |
209 | switch (cmd) { |
210 | case RUN_AS_OPEN: | |
211 | break; | |
212 | default: | |
213 | return 0; | |
214 | } | |
215 | if (*fd < 0) { | |
216 | return 0; | |
217 | } | |
218 | len = lttcomm_recv_fds_unix_sock(worker->sockpair[0], fd, 1); | |
da9ee832 JG |
219 | if (!len) { |
220 | return -1; | |
221 | } else if (len < 0) { | |
7567352f MD |
222 | PERROR("lttcomm_recv_fds_unix_sock"); |
223 | return -1; | |
224 | } | |
225 | return 0; | |
4628484a MD |
226 | } |
227 | ||
7567352f MD |
228 | /* |
229 | * Return < 0 on error, 0 if OK, 1 on hangup. | |
230 | */ | |
c2b75c49 | 231 | static |
7567352f | 232 | int handle_one_cmd(struct run_as_worker *worker) |
c2b75c49 | 233 | { |
7567352f MD |
234 | int ret = 0; |
235 | struct run_as_data data; | |
236 | ssize_t readlen, writelen; | |
df5b86c8 | 237 | struct run_as_ret sendret; |
7567352f MD |
238 | run_as_fct cmd; |
239 | uid_t prev_euid; | |
240 | ||
241 | /* Read data */ | |
242 | readlen = lttcomm_recv_unix_sock(worker->sockpair[1], &data, | |
243 | sizeof(data)); | |
244 | if (readlen == 0) { | |
245 | /* hang up */ | |
246 | ret = 1; | |
247 | goto end; | |
248 | } | |
249 | if (readlen < sizeof(data)) { | |
250 | PERROR("lttcomm_recv_unix_sock error"); | |
251 | ret = -1; | |
252 | goto end; | |
253 | } | |
c2b75c49 | 254 | |
7567352f MD |
255 | cmd = run_as_enum_to_fct(data.cmd); |
256 | if (!cmd) { | |
257 | ret = -1; | |
258 | goto end; | |
259 | } | |
260 | ||
261 | prev_euid = getuid(); | |
262 | if (data.gid != getegid()) { | |
263 | ret = setegid(data.gid); | |
1576d582 | 264 | if (ret < 0) { |
4c462e79 | 265 | PERROR("setegid"); |
6d73c4ef | 266 | goto write_return; |
1576d582 | 267 | } |
c2b75c49 | 268 | } |
7567352f MD |
269 | if (data.uid != prev_euid) { |
270 | ret = seteuid(data.uid); | |
1576d582 | 271 | if (ret < 0) { |
4c462e79 | 272 | PERROR("seteuid"); |
6d73c4ef | 273 | goto write_return; |
1576d582 | 274 | } |
c2b75c49 MD |
275 | } |
276 | /* | |
277 | * Also set umask to 0 for mkdir executable bit. | |
278 | */ | |
279 | umask(0); | |
7567352f | 280 | ret = (*cmd)(&data); |
6d73c4ef MD |
281 | |
282 | write_return: | |
df5b86c8 MD |
283 | sendret.ret = ret; |
284 | sendret._errno = errno; | |
c2b75c49 | 285 | /* send back return value */ |
7567352f MD |
286 | writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret, |
287 | sizeof(sendret)); | |
6cd525e8 | 288 | if (writelen < sizeof(sendret)) { |
7567352f MD |
289 | PERROR("lttcomm_send_unix_sock error"); |
290 | ret = -1; | |
291 | goto end; | |
292 | } | |
293 | ret = do_send_fd(worker, data.cmd, ret); | |
294 | if (ret) { | |
295 | PERROR("do_send_fd error"); | |
296 | ret = -1; | |
297 | goto end; | |
298 | } | |
299 | if (seteuid(prev_euid) < 0) { | |
300 | PERROR("seteuid"); | |
301 | ret = -1; | |
302 | goto end; | |
303 | } | |
304 | ret = 0; | |
305 | end: | |
306 | return ret; | |
307 | } | |
308 | ||
309 | static | |
310 | int run_as_worker(struct run_as_worker *worker) | |
311 | { | |
312 | int ret; | |
313 | ssize_t writelen; | |
314 | struct run_as_ret sendret; | |
315 | size_t proc_orig_len; | |
316 | ||
317 | /* | |
318 | * Initialize worker. Set a different process cmdline. | |
319 | */ | |
320 | proc_orig_len = strlen(worker->procname); | |
321 | memset(worker->procname, 0, proc_orig_len); | |
322 | strncpy(worker->procname, DEFAULT_RUN_AS_WORKER_NAME, proc_orig_len); | |
323 | ||
324 | ret = pthread_setname_np(pthread_self(), DEFAULT_RUN_AS_WORKER_NAME); | |
325 | if (ret) { | |
326 | errno = ret; | |
327 | ret = -1; | |
328 | PERROR("pthread_setname_np"); | |
6cd525e8 | 329 | return EXIT_FAILURE; |
6cd525e8 | 330 | } |
7567352f MD |
331 | |
332 | sendret.ret = 0; | |
333 | sendret._errno = 0; | |
334 | writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret, | |
335 | sizeof(sendret)); | |
336 | if (writelen < sizeof(sendret)) { | |
337 | PERROR("lttcomm_send_unix_sock error"); | |
338 | ret = EXIT_FAILURE; | |
339 | goto end; | |
340 | } | |
341 | ||
342 | for (;;) { | |
343 | ret = handle_one_cmd(worker); | |
344 | if (ret < 0) { | |
345 | ret = EXIT_FAILURE; | |
346 | goto end; | |
347 | } else if (ret > 0) { | |
348 | break; | |
349 | } else { | |
350 | continue; /* Next command. */ | |
351 | } | |
352 | } | |
353 | ret = EXIT_SUCCESS; | |
354 | end: | |
355 | return ret; | |
c2b75c49 MD |
356 | } |
357 | ||
60b6c79c | 358 | static |
7567352f MD |
359 | int run_as_cmd(struct run_as_worker *worker, |
360 | enum run_as_cmd cmd, | |
361 | struct run_as_data *data, | |
362 | uid_t uid, gid_t gid) | |
60b6c79c | 363 | { |
7567352f | 364 | ssize_t readlen, writelen; |
df5b86c8 | 365 | struct run_as_ret recvret; |
60b6c79c | 366 | |
7567352f | 367 | pthread_mutex_lock(&worker_lock); |
60b6c79c MD |
368 | /* |
369 | * If we are non-root, we can only deal with our own uid. | |
370 | */ | |
371 | if (geteuid() != 0) { | |
372 | if (uid != geteuid()) { | |
df5b86c8 MD |
373 | recvret.ret = -1; |
374 | recvret._errno = EPERM; | |
60b6c79c MD |
375 | ERR("Client (%d)/Server (%d) UID mismatch (and sessiond is not root)", |
376 | uid, geteuid()); | |
df5b86c8 | 377 | goto end; |
60b6c79c | 378 | } |
60b6c79c MD |
379 | } |
380 | ||
7567352f MD |
381 | data->cmd = cmd; |
382 | data->uid = uid; | |
383 | data->gid = gid; | |
384 | ||
385 | writelen = lttcomm_send_unix_sock(worker->sockpair[0], data, | |
386 | sizeof(*data)); | |
387 | if (writelen < sizeof(*data)) { | |
388 | PERROR("Error writing message to run_as"); | |
df5b86c8 MD |
389 | recvret.ret = -1; |
390 | recvret._errno = errno; | |
60b6c79c | 391 | goto end; |
c2b75c49 | 392 | } |
7567352f | 393 | |
c2b75c49 | 394 | /* receive return value */ |
7567352f MD |
395 | readlen = lttcomm_recv_unix_sock(worker->sockpair[0], &recvret, |
396 | sizeof(recvret)); | |
da9ee832 JG |
397 | if (!readlen) { |
398 | ERR("Run-as worker has hung-up during run_as_cmd"); | |
399 | recvret.ret = -1; | |
400 | recvret._errno = EIO; | |
401 | goto end; | |
402 | } else if (readlen < sizeof(recvret)) { | |
7567352f | 403 | PERROR("Error reading response from run_as"); |
df5b86c8 MD |
404 | recvret.ret = -1; |
405 | recvret._errno = errno; | |
6cd525e8 | 406 | } |
7567352f | 407 | if (do_recv_fd(worker, cmd, &recvret.ret)) { |
df5b86c8 | 408 | recvret.ret = -1; |
da9ee832 | 409 | recvret._errno = EIO; |
4c462e79 | 410 | } |
7567352f | 411 | |
60b6c79c | 412 | end: |
7567352f | 413 | pthread_mutex_unlock(&worker_lock); |
df5b86c8 MD |
414 | errno = recvret._errno; |
415 | return recvret.ret; | |
60b6c79c MD |
416 | } |
417 | ||
2d85a600 | 418 | /* |
7567352f | 419 | * This is for debugging ONLY and should not be considered secure. |
2d85a600 MD |
420 | */ |
421 | static | |
7567352f MD |
422 | int run_as_noworker(enum run_as_cmd cmd, |
423 | struct run_as_data *data, uid_t uid, gid_t gid) | |
2d85a600 | 424 | { |
df5b86c8 | 425 | int ret, saved_errno; |
5b73926f | 426 | mode_t old_mask; |
7567352f | 427 | run_as_fct fct; |
5b73926f | 428 | |
7567352f MD |
429 | fct = run_as_enum_to_fct(cmd); |
430 | if (!fct) { | |
431 | errno = -ENOSYS; | |
432 | ret = -1; | |
433 | goto end; | |
434 | } | |
5b73926f | 435 | old_mask = umask(0); |
7567352f | 436 | ret = fct(data); |
df5b86c8 | 437 | saved_errno = errno; |
5b73926f | 438 | umask(old_mask); |
df5b86c8 | 439 | errno = saved_errno; |
7567352f | 440 | end: |
5b73926f | 441 | return ret; |
2d85a600 MD |
442 | } |
443 | ||
444 | static | |
7567352f MD |
445 | int run_as(struct run_as_worker *worker, |
446 | enum run_as_cmd cmd, | |
447 | struct run_as_data *data, uid_t uid, gid_t gid) | |
2d85a600 | 448 | { |
7567352f MD |
449 | int ret; |
450 | ||
451 | if (worker) { | |
452 | DBG("Using run_as worker"); | |
453 | ret = run_as_cmd(worker, cmd, data, uid, gid); | |
2d85a600 | 454 | } else { |
7567352f MD |
455 | DBG("Using run_as without worker"); |
456 | ret = run_as_noworker(cmd, data, uid, gid); | |
2d85a600 | 457 | } |
7567352f | 458 | return ret; |
2d85a600 MD |
459 | } |
460 | ||
90e535ef | 461 | LTTNG_HIDDEN |
e11d277b | 462 | int run_as_mkdir_recursive(const char *path, mode_t mode, uid_t uid, gid_t gid) |
60b6c79c | 463 | { |
7567352f MD |
464 | struct run_as_worker *worker = global_worker; |
465 | struct run_as_data data; | |
60b6c79c MD |
466 | |
467 | DBG3("mkdir() recursive %s with mode %d for uid %d and gid %d", | |
468 | path, mode, uid, gid); | |
7567352f MD |
469 | strncpy(data.u.mkdir.path, path, PATH_MAX - 1); |
470 | data.u.mkdir.path[PATH_MAX - 1] = '\0'; | |
471 | data.u.mkdir.mode = mode; | |
472 | return run_as(worker, RUN_AS_MKDIR_RECURSIVE, &data, uid, gid); | |
60b6c79c MD |
473 | } |
474 | ||
90e535ef | 475 | LTTNG_HIDDEN |
e11d277b | 476 | int run_as_mkdir(const char *path, mode_t mode, uid_t uid, gid_t gid) |
60b6c79c | 477 | { |
7567352f MD |
478 | struct run_as_worker *worker = global_worker; |
479 | struct run_as_data data; | |
60b6c79c MD |
480 | |
481 | DBG3("mkdir() %s with mode %d for uid %d and gid %d", | |
482 | path, mode, uid, gid); | |
7567352f MD |
483 | strncpy(data.u.mkdir.path, path, PATH_MAX - 1); |
484 | data.u.mkdir.path[PATH_MAX - 1] = '\0'; | |
485 | data.u.mkdir.mode = mode; | |
486 | return run_as(worker, RUN_AS_MKDIR, &data, uid, gid); | |
60b6c79c MD |
487 | } |
488 | ||
489 | /* | |
490 | * Note: open_run_as is currently not working. We'd need to pass the fd | |
491 | * opened in the child to the parent. | |
492 | */ | |
90e535ef | 493 | LTTNG_HIDDEN |
e11d277b | 494 | int run_as_open(const char *path, int flags, mode_t mode, uid_t uid, gid_t gid) |
60b6c79c | 495 | { |
7567352f MD |
496 | struct run_as_worker *worker = global_worker; |
497 | struct run_as_data data; | |
c2b75c49 | 498 | |
47fb7563 MD |
499 | DBG3("open() %s with flags %X mode %d for uid %d and gid %d", |
500 | path, flags, mode, uid, gid); | |
7567352f MD |
501 | strncpy(data.u.open.path, path, PATH_MAX - 1); |
502 | data.u.open.path[PATH_MAX - 1] = '\0'; | |
503 | data.u.open.flags = flags; | |
504 | data.u.open.mode = mode; | |
505 | return run_as(worker, RUN_AS_OPEN, &data, uid, gid); | |
60b6c79c | 506 | } |
4628484a MD |
507 | |
508 | LTTNG_HIDDEN | |
509 | int run_as_unlink(const char *path, uid_t uid, gid_t gid) | |
510 | { | |
7567352f MD |
511 | struct run_as_worker *worker = global_worker; |
512 | struct run_as_data data; | |
4628484a MD |
513 | |
514 | DBG3("unlink() %s with for uid %d and gid %d", | |
515 | path, uid, gid); | |
7567352f MD |
516 | strncpy(data.u.unlink.path, path, PATH_MAX - 1); |
517 | data.u.unlink.path[PATH_MAX - 1] = '\0'; | |
518 | return run_as(worker, RUN_AS_UNLINK, &data, uid, gid); | |
4628484a MD |
519 | } |
520 | ||
521 | LTTNG_HIDDEN | |
7567352f | 522 | int run_as_rmdir_recursive(const char *path, uid_t uid, gid_t gid) |
4628484a | 523 | { |
7567352f MD |
524 | struct run_as_worker *worker = global_worker; |
525 | struct run_as_data data; | |
4628484a | 526 | |
7567352f | 527 | DBG3("rmdir_recursive() %s with for uid %d and gid %d", |
4628484a | 528 | path, uid, gid); |
7567352f MD |
529 | strncpy(data.u.rmdir_recursive.path, path, PATH_MAX - 1); |
530 | data.u.rmdir_recursive.path[PATH_MAX - 1] = '\0'; | |
531 | return run_as(worker, RUN_AS_RMDIR_RECURSIVE, &data, uid, gid); | |
532 | } | |
533 | ||
534 | LTTNG_HIDDEN | |
535 | int run_as_create_worker(char *procname) | |
536 | { | |
537 | pid_t pid; | |
538 | int i, ret = 0; | |
539 | ssize_t readlen; | |
540 | struct run_as_ret recvret; | |
541 | struct run_as_worker *worker; | |
542 | ||
543 | if (!use_clone()) { | |
544 | ret = 0; | |
545 | goto end; | |
546 | } | |
547 | worker = zmalloc(sizeof(*worker)); | |
548 | if (!worker) { | |
549 | ret = -ENOMEM; | |
550 | goto end; | |
551 | } | |
552 | worker->procname = procname; | |
553 | /* Create unix socket. */ | |
554 | if (lttcomm_create_anon_unix_socketpair(worker->sockpair) < 0) { | |
555 | ret = -1; | |
556 | goto error_sock; | |
557 | } | |
558 | /* Fork worker. */ | |
559 | pid = fork(); | |
560 | if (pid < 0) { | |
561 | PERROR("fork"); | |
562 | ret = -1; | |
563 | goto error_fork; | |
564 | } else if (pid == 0) { | |
565 | /* Child */ | |
566 | ||
567 | /* Just close, no shutdown. */ | |
568 | if (close(worker->sockpair[0])) { | |
569 | PERROR("close"); | |
570 | exit(EXIT_FAILURE); | |
571 | } | |
572 | worker->sockpair[0] = -1; | |
573 | ret = run_as_worker(worker); | |
574 | if (lttcomm_close_unix_sock(worker->sockpair[1])) { | |
575 | PERROR("close"); | |
576 | ret = -1; | |
577 | } | |
578 | worker->sockpair[1] = -1; | |
579 | exit(ret ? EXIT_FAILURE : EXIT_SUCCESS); | |
580 | } else { | |
581 | /* Parent */ | |
582 | ||
583 | /* Just close, no shutdown. */ | |
584 | if (close(worker->sockpair[1])) { | |
585 | PERROR("close"); | |
586 | ret = -1; | |
587 | goto error_fork; | |
588 | } | |
589 | worker->sockpair[1] = -1; | |
590 | worker->pid = pid; | |
591 | /* Wait for worker to become ready. */ | |
592 | readlen = lttcomm_recv_unix_sock(worker->sockpair[0], | |
593 | &recvret, sizeof(recvret)); | |
594 | if (readlen < sizeof(recvret)) { | |
595 | ERR("readlen: %zd", readlen); | |
596 | PERROR("Error reading response from run_as at creation"); | |
597 | ret = -1; | |
598 | goto error_fork; | |
599 | } | |
600 | global_worker = worker; | |
601 | } | |
602 | end: | |
603 | return ret; | |
604 | ||
605 | /* Error handling. */ | |
606 | error_fork: | |
607 | for (i = 0; i < 2; i++) { | |
608 | if (worker->sockpair[i] < 0) { | |
609 | continue; | |
610 | } | |
611 | if (lttcomm_close_unix_sock(worker->sockpair[i])) { | |
612 | PERROR("close"); | |
613 | } | |
614 | worker->sockpair[i] = -1; | |
615 | } | |
616 | error_sock: | |
617 | free(worker); | |
618 | return ret; | |
619 | } | |
620 | ||
621 | LTTNG_HIDDEN | |
622 | void run_as_destroy_worker(void) | |
623 | { | |
624 | struct run_as_worker *worker = global_worker; | |
625 | int status; | |
626 | pid_t pid; | |
627 | ||
628 | if (!worker) { | |
629 | return; | |
630 | } | |
631 | /* Close unix socket */ | |
632 | if (lttcomm_close_unix_sock(worker->sockpair[0])) { | |
633 | PERROR("close"); | |
634 | } | |
635 | worker->sockpair[0] = -1; | |
636 | /* Wait for worker. */ | |
637 | pid = waitpid(worker->pid, &status, 0); | |
638 | if (pid < 0 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) { | |
639 | PERROR("wait"); | |
640 | } | |
641 | free(worker); | |
642 | global_worker = NULL; | |
4628484a | 643 | } |