Commit | Line | Data |
---|---|---|
81b86775 DG |
1 | /* |
2 | * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _GNU_SOURCE | |
35f90c40 | 19 | #include <assert.h> |
81b86775 DG |
20 | #include <ctype.h> |
21 | #include <fcntl.h> | |
22 | #include <limits.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
2d851108 | 25 | #include <sys/stat.h> |
0c7bcad5 | 26 | #include <sys/types.h> |
2d851108 | 27 | #include <unistd.h> |
fe4477ee | 28 | #include <inttypes.h> |
70d0b120 | 29 | #include <regex.h> |
6c71277b | 30 | #include <grp.h> |
81b86775 DG |
31 | |
32 | #include <common/common.h> | |
fe4477ee | 33 | #include <common/runas.h> |
81b86775 DG |
34 | |
35 | #include "utils.h" | |
feb0f3e5 | 36 | #include "defaults.h" |
81b86775 | 37 | |
5154230f RB |
38 | /* |
39 | * Return a partial realpath(3) of the path even if the full path does not | |
40 | * exist. For instance, with /tmp/test1/test2/test3, if test2/ does not exist | |
41 | * but the /tmp/test1 does, the real path for /tmp/test1 is concatened with | |
42 | * /test2/test3 then returned. In normal time, realpath(3) fails if the end | |
43 | * point directory does not exist. | |
44 | * In case resolved_path is NULL, the string returned was allocated in the | |
45 | * function and thus need to be freed by the caller. The size argument allows | |
46 | * to specify the size of the resolved_path argument if given, or the size to | |
47 | * allocate. | |
48 | */ | |
49 | LTTNG_HIDDEN | |
50 | char *utils_partial_realpath(const char *path, char *resolved_path, size_t size) | |
51 | { | |
52 | char *cut_path, *try_path = NULL, *try_path_prev = NULL; | |
53 | const char *next, *prev, *end; | |
54 | ||
55 | /* Safety net */ | |
56 | if (path == NULL) { | |
57 | goto error; | |
58 | } | |
59 | ||
60 | /* | |
61 | * Identify the end of the path, we don't want to treat the | |
62 | * last char if it is a '/', we will just keep it on the side | |
63 | * to be added at the end, and return a value coherent with | |
64 | * the path given as argument | |
65 | */ | |
66 | end = path + strlen(path); | |
67 | if (*(end-1) == '/') { | |
68 | end--; | |
69 | } | |
70 | ||
71 | /* Initiate the values of the pointers before looping */ | |
72 | next = path; | |
73 | prev = next; | |
74 | /* Only to ensure try_path is not NULL to enter the while */ | |
75 | try_path = (char *)next; | |
76 | ||
77 | /* Resolve the canonical path of the first part of the path */ | |
78 | while (try_path != NULL && next != end) { | |
79 | /* | |
80 | * If there is not any '/' left, we want to try with | |
81 | * the full path | |
82 | */ | |
83 | next = strpbrk(next + 1, "/"); | |
84 | if (next == NULL) { | |
85 | next = end; | |
86 | } | |
87 | ||
88 | /* Cut the part we will be trying to resolve */ | |
89 | cut_path = strndup(path, next - path); | |
90 | ||
91 | /* Try to resolve this part */ | |
92 | try_path = realpath((char *)cut_path, NULL); | |
93 | if (try_path == NULL) { | |
94 | /* | |
95 | * There was an error, we just want to be assured it | |
96 | * is linked to an unexistent directory, if it's another | |
97 | * reason, we spawn an error | |
98 | */ | |
99 | switch (errno) { | |
100 | case ENOENT: | |
101 | /* Ignore the error */ | |
102 | break; | |
103 | default: | |
104 | PERROR("realpath (partial_realpath)"); | |
105 | goto error; | |
106 | break; | |
107 | } | |
108 | } else { | |
109 | /* Save the place we are before trying the next step */ | |
110 | free(try_path_prev); | |
111 | try_path_prev = try_path; | |
112 | prev = next; | |
113 | } | |
114 | ||
115 | /* Free the allocated memory */ | |
116 | free(cut_path); | |
117 | }; | |
118 | ||
119 | /* Allocate memory for the resolved path if necessary */ | |
120 | if (resolved_path == NULL) { | |
121 | resolved_path = zmalloc(size); | |
122 | if (resolved_path == NULL) { | |
123 | PERROR("zmalloc resolved path"); | |
124 | goto error; | |
125 | } | |
126 | } | |
127 | ||
128 | /* | |
129 | * If we were able to solve at least partially the path, we can concatenate | |
130 | * what worked and what didn't work | |
131 | */ | |
132 | if (try_path_prev != NULL) { | |
133 | /* If we risk to concatenate two '/', we remove one of them */ | |
134 | if (try_path_prev[strlen(try_path_prev) - 1] == '/' && prev[0] == '/') { | |
135 | try_path_prev[strlen(try_path_prev) - 1] = '\0'; | |
136 | } | |
137 | ||
138 | /* | |
139 | * Duplicate the memory used by prev in case resolved_path and | |
140 | * path are pointers for the same memory space | |
141 | */ | |
142 | cut_path = strdup(prev); | |
143 | ||
144 | /* Concatenate the strings */ | |
145 | snprintf(resolved_path, size, "%s%s", try_path_prev, cut_path); | |
146 | ||
147 | /* Free the allocated memory */ | |
148 | free(cut_path); | |
149 | free(try_path_prev); | |
150 | /* | |
151 | * Else, we just copy the path in our resolved_path to | |
152 | * return it as is | |
153 | */ | |
154 | } else { | |
155 | strncpy(resolved_path, path, size); | |
156 | } | |
157 | ||
158 | /* Then we return the 'partially' resolved path */ | |
159 | return resolved_path; | |
160 | ||
161 | error: | |
162 | free(resolved_path); | |
163 | return NULL; | |
164 | } | |
165 | ||
81b86775 | 166 | /* |
3d229795 RB |
167 | * Make a full resolution of the given path even if it doesn't exist. |
168 | * This function uses the utils_partial_realpath function to resolve | |
169 | * symlinks and relatives paths at the start of the string, and | |
170 | * implements functionnalities to resolve the './' and '../' strings | |
171 | * in the middle of a path. This function is only necessary because | |
172 | * realpath(3) does not accept to resolve unexistent paths. | |
173 | * The returned string was allocated in the function, it is thus of | |
174 | * the responsibility of the caller to free this memory. | |
81b86775 | 175 | */ |
90e535ef | 176 | LTTNG_HIDDEN |
81b86775 DG |
177 | char *utils_expand_path(const char *path) |
178 | { | |
3d229795 | 179 | char *next, *previous, *slash, *start_path, *absolute_path = NULL; |
81b86775 DG |
180 | |
181 | /* Safety net */ | |
182 | if (path == NULL) { | |
183 | goto error; | |
184 | } | |
185 | ||
3d229795 RB |
186 | /* Allocate memory for the absolute_path */ |
187 | absolute_path = zmalloc(PATH_MAX); | |
188 | if (absolute_path == NULL) { | |
81b86775 DG |
189 | PERROR("zmalloc expand path"); |
190 | goto error; | |
191 | } | |
192 | ||
3d229795 RB |
193 | /* |
194 | * If the path is not already absolute nor explicitly relative, | |
195 | * consider we're in the current directory | |
196 | */ | |
197 | if (*path != '/' && strncmp(path, "./", 2) != 0 && | |
198 | strncmp(path, "../", 3) != 0) { | |
199 | snprintf(absolute_path, PATH_MAX, "./%s", path); | |
200 | /* Else, we just copy the path */ | |
116f95d9 | 201 | } else { |
3d229795 RB |
202 | strncpy(absolute_path, path, PATH_MAX); |
203 | } | |
116f95d9 | 204 | |
3d229795 RB |
205 | /* Resolve partially our path */ |
206 | absolute_path = utils_partial_realpath(absolute_path, | |
207 | absolute_path, PATH_MAX); | |
116f95d9 | 208 | |
3d229795 RB |
209 | /* As long as we find '/./' in the working_path string */ |
210 | while ((next = strstr(absolute_path, "/./"))) { | |
116f95d9 | 211 | |
3d229795 RB |
212 | /* We prepare the start_path not containing it */ |
213 | start_path = strndup(absolute_path, next - absolute_path); | |
116f95d9 | 214 | |
3d229795 RB |
215 | /* And we concatenate it with the part after this string */ |
216 | snprintf(absolute_path, PATH_MAX, "%s%s", start_path, next + 2); | |
116f95d9 | 217 | |
3d229795 RB |
218 | free(start_path); |
219 | } | |
116f95d9 | 220 | |
3d229795 RB |
221 | /* As long as we find '/../' in the working_path string */ |
222 | while ((next = strstr(absolute_path, "/../"))) { | |
223 | /* We find the last level of directory */ | |
224 | previous = absolute_path; | |
225 | while ((slash = strpbrk(previous, "/")) && slash != next) { | |
226 | previous = slash + 1; | |
81b86775 | 227 | } |
81b86775 | 228 | |
3d229795 RB |
229 | /* Then we prepare the start_path not containing it */ |
230 | start_path = strndup(absolute_path, previous - absolute_path); | |
231 | ||
232 | /* And we concatenate it with the part after the '/../' */ | |
233 | snprintf(absolute_path, PATH_MAX, "%s%s", start_path, next + 4); | |
234 | ||
235 | /* We can free the memory used for the start path*/ | |
236 | free(start_path); | |
237 | ||
238 | /* Then we verify for symlinks using partial_realpath */ | |
239 | absolute_path = utils_partial_realpath(absolute_path, | |
240 | absolute_path, PATH_MAX); | |
116f95d9 | 241 | } |
81b86775 | 242 | |
3d229795 | 243 | return absolute_path; |
81b86775 DG |
244 | |
245 | error: | |
3d229795 | 246 | free(absolute_path); |
81b86775 DG |
247 | return NULL; |
248 | } | |
249 | ||
250 | /* | |
251 | * Create a pipe in dst. | |
252 | */ | |
90e535ef | 253 | LTTNG_HIDDEN |
81b86775 DG |
254 | int utils_create_pipe(int *dst) |
255 | { | |
256 | int ret; | |
257 | ||
258 | if (dst == NULL) { | |
259 | return -1; | |
260 | } | |
261 | ||
262 | ret = pipe(dst); | |
263 | if (ret < 0) { | |
264 | PERROR("create pipe"); | |
265 | } | |
266 | ||
267 | return ret; | |
268 | } | |
269 | ||
270 | /* | |
271 | * Create pipe and set CLOEXEC flag to both fd. | |
272 | * | |
273 | * Make sure the pipe opened by this function are closed at some point. Use | |
274 | * utils_close_pipe(). | |
275 | */ | |
90e535ef | 276 | LTTNG_HIDDEN |
81b86775 DG |
277 | int utils_create_pipe_cloexec(int *dst) |
278 | { | |
279 | int ret, i; | |
280 | ||
281 | if (dst == NULL) { | |
282 | return -1; | |
283 | } | |
284 | ||
285 | ret = utils_create_pipe(dst); | |
286 | if (ret < 0) { | |
287 | goto error; | |
288 | } | |
289 | ||
290 | for (i = 0; i < 2; i++) { | |
291 | ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC); | |
292 | if (ret < 0) { | |
293 | PERROR("fcntl pipe cloexec"); | |
294 | goto error; | |
295 | } | |
296 | } | |
297 | ||
298 | error: | |
299 | return ret; | |
300 | } | |
301 | ||
094f381c MD |
302 | /* |
303 | * Create pipe and set fd flags to FD_CLOEXEC and O_NONBLOCK. | |
304 | * | |
305 | * Make sure the pipe opened by this function are closed at some point. Use | |
306 | * utils_close_pipe(). Using pipe() and fcntl rather than pipe2() to | |
307 | * support OSes other than Linux 2.6.23+. | |
308 | */ | |
309 | LTTNG_HIDDEN | |
310 | int utils_create_pipe_cloexec_nonblock(int *dst) | |
311 | { | |
312 | int ret, i; | |
313 | ||
314 | if (dst == NULL) { | |
315 | return -1; | |
316 | } | |
317 | ||
318 | ret = utils_create_pipe(dst); | |
319 | if (ret < 0) { | |
320 | goto error; | |
321 | } | |
322 | ||
323 | for (i = 0; i < 2; i++) { | |
324 | ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC); | |
325 | if (ret < 0) { | |
326 | PERROR("fcntl pipe cloexec"); | |
327 | goto error; | |
328 | } | |
329 | /* | |
330 | * Note: we override any flag that could have been | |
331 | * previously set on the fd. | |
332 | */ | |
333 | ret = fcntl(dst[i], F_SETFL, O_NONBLOCK); | |
334 | if (ret < 0) { | |
335 | PERROR("fcntl pipe nonblock"); | |
336 | goto error; | |
337 | } | |
338 | } | |
339 | ||
340 | error: | |
341 | return ret; | |
342 | } | |
343 | ||
81b86775 DG |
344 | /* |
345 | * Close both read and write side of the pipe. | |
346 | */ | |
90e535ef | 347 | LTTNG_HIDDEN |
81b86775 DG |
348 | void utils_close_pipe(int *src) |
349 | { | |
350 | int i, ret; | |
351 | ||
352 | if (src == NULL) { | |
353 | return; | |
354 | } | |
355 | ||
356 | for (i = 0; i < 2; i++) { | |
357 | /* Safety check */ | |
358 | if (src[i] < 0) { | |
359 | continue; | |
360 | } | |
361 | ||
362 | ret = close(src[i]); | |
363 | if (ret) { | |
364 | PERROR("close pipe"); | |
365 | } | |
366 | } | |
367 | } | |
a4b92340 DG |
368 | |
369 | /* | |
370 | * Create a new string using two strings range. | |
371 | */ | |
90e535ef | 372 | LTTNG_HIDDEN |
a4b92340 DG |
373 | char *utils_strdupdelim(const char *begin, const char *end) |
374 | { | |
375 | char *str; | |
376 | ||
377 | str = zmalloc(end - begin + 1); | |
378 | if (str == NULL) { | |
379 | PERROR("zmalloc strdupdelim"); | |
380 | goto error; | |
381 | } | |
382 | ||
383 | memcpy(str, begin, end - begin); | |
384 | str[end - begin] = '\0'; | |
385 | ||
386 | error: | |
387 | return str; | |
388 | } | |
b662582b DG |
389 | |
390 | /* | |
391 | * Set CLOEXEC flag to the give file descriptor. | |
392 | */ | |
90e535ef | 393 | LTTNG_HIDDEN |
b662582b DG |
394 | int utils_set_fd_cloexec(int fd) |
395 | { | |
396 | int ret; | |
397 | ||
398 | if (fd < 0) { | |
399 | ret = -EINVAL; | |
400 | goto end; | |
401 | } | |
402 | ||
403 | ret = fcntl(fd, F_SETFD, FD_CLOEXEC); | |
404 | if (ret < 0) { | |
405 | PERROR("fcntl cloexec"); | |
406 | ret = -errno; | |
407 | } | |
408 | ||
409 | end: | |
410 | return ret; | |
411 | } | |
35f90c40 DG |
412 | |
413 | /* | |
414 | * Create pid file to the given path and filename. | |
415 | */ | |
90e535ef | 416 | LTTNG_HIDDEN |
35f90c40 DG |
417 | int utils_create_pid_file(pid_t pid, const char *filepath) |
418 | { | |
419 | int ret; | |
420 | FILE *fp; | |
421 | ||
422 | assert(filepath); | |
423 | ||
424 | fp = fopen(filepath, "w"); | |
425 | if (fp == NULL) { | |
426 | PERROR("open pid file %s", filepath); | |
427 | ret = -1; | |
428 | goto error; | |
429 | } | |
430 | ||
431 | ret = fprintf(fp, "%d\n", pid); | |
432 | if (ret < 0) { | |
433 | PERROR("fprintf pid file"); | |
434 | } | |
435 | ||
436 | fclose(fp); | |
437 | DBG("Pid %d written in file %s", pid, filepath); | |
438 | error: | |
439 | return ret; | |
440 | } | |
2d851108 DG |
441 | |
442 | /* | |
443 | * Recursively create directory using the given path and mode. | |
444 | * | |
445 | * On success, return 0 else a negative error code. | |
446 | */ | |
90e535ef | 447 | LTTNG_HIDDEN |
2d851108 DG |
448 | int utils_mkdir_recursive(const char *path, mode_t mode) |
449 | { | |
450 | char *p, tmp[PATH_MAX]; | |
2d851108 DG |
451 | size_t len; |
452 | int ret; | |
453 | ||
454 | assert(path); | |
455 | ||
456 | ret = snprintf(tmp, sizeof(tmp), "%s", path); | |
457 | if (ret < 0) { | |
458 | PERROR("snprintf mkdir"); | |
459 | goto error; | |
460 | } | |
461 | ||
462 | len = ret; | |
463 | if (tmp[len - 1] == '/') { | |
464 | tmp[len - 1] = 0; | |
465 | } | |
466 | ||
467 | for (p = tmp + 1; *p; p++) { | |
468 | if (*p == '/') { | |
469 | *p = 0; | |
470 | if (tmp[strlen(tmp) - 1] == '.' && | |
471 | tmp[strlen(tmp) - 2] == '.' && | |
472 | tmp[strlen(tmp) - 3] == '/') { | |
473 | ERR("Using '/../' is not permitted in the trace path (%s)", | |
474 | tmp); | |
475 | ret = -1; | |
476 | goto error; | |
477 | } | |
0c7bcad5 | 478 | ret = mkdir(tmp, mode); |
2d851108 | 479 | if (ret < 0) { |
0c7bcad5 MD |
480 | if (errno != EEXIST) { |
481 | PERROR("mkdir recursive"); | |
482 | ret = -errno; | |
483 | goto error; | |
2d851108 DG |
484 | } |
485 | } | |
486 | *p = '/'; | |
487 | } | |
488 | } | |
489 | ||
490 | ret = mkdir(tmp, mode); | |
491 | if (ret < 0) { | |
492 | if (errno != EEXIST) { | |
493 | PERROR("mkdir recursive last piece"); | |
494 | ret = -errno; | |
495 | } else { | |
496 | ret = 0; | |
497 | } | |
498 | } | |
499 | ||
500 | error: | |
501 | return ret; | |
502 | } | |
fe4477ee JD |
503 | |
504 | /* | |
505 | * Create the stream tracefile on disk. | |
506 | * | |
507 | * Return 0 on success or else a negative value. | |
508 | */ | |
bc182241 | 509 | LTTNG_HIDDEN |
07b86b52 | 510 | int utils_create_stream_file(const char *path_name, char *file_name, uint64_t size, |
309167d2 | 511 | uint64_t count, int uid, int gid, char *suffix) |
fe4477ee | 512 | { |
be96a7d1 | 513 | int ret, out_fd, flags, mode; |
309167d2 JD |
514 | char full_path[PATH_MAX], *path_name_suffix = NULL, *path; |
515 | char *extra = NULL; | |
fe4477ee JD |
516 | |
517 | assert(path_name); | |
518 | assert(file_name); | |
519 | ||
520 | ret = snprintf(full_path, sizeof(full_path), "%s/%s", | |
521 | path_name, file_name); | |
522 | if (ret < 0) { | |
523 | PERROR("snprintf create output file"); | |
524 | goto error; | |
525 | } | |
526 | ||
309167d2 JD |
527 | /* Setup extra string if suffix or/and a count is needed. */ |
528 | if (size > 0 && suffix) { | |
529 | ret = asprintf(&extra, "_%" PRIu64 "%s", count, suffix); | |
530 | } else if (size > 0) { | |
531 | ret = asprintf(&extra, "_%" PRIu64, count); | |
532 | } else if (suffix) { | |
533 | ret = asprintf(&extra, "%s", suffix); | |
534 | } | |
535 | if (ret < 0) { | |
536 | PERROR("Allocating extra string to name"); | |
537 | goto error; | |
538 | } | |
539 | ||
fe4477ee JD |
540 | /* |
541 | * If we split the trace in multiple files, we have to add the count at the | |
542 | * end of the tracefile name | |
543 | */ | |
309167d2 JD |
544 | if (extra) { |
545 | ret = asprintf(&path_name_suffix, "%s%s", full_path, extra); | |
fe4477ee | 546 | if (ret < 0) { |
309167d2 JD |
547 | PERROR("Allocating path name with extra string"); |
548 | goto error_free_suffix; | |
fe4477ee | 549 | } |
309167d2 | 550 | path = path_name_suffix; |
fe4477ee JD |
551 | } else { |
552 | path = full_path; | |
553 | } | |
554 | ||
be96a7d1 | 555 | flags = O_WRONLY | O_CREAT | O_TRUNC; |
0f907de1 | 556 | /* Open with 660 mode */ |
be96a7d1 DG |
557 | mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; |
558 | ||
559 | if (uid < 0 || gid < 0) { | |
560 | out_fd = open(path, flags, mode); | |
561 | } else { | |
562 | out_fd = run_as_open(path, flags, mode, uid, gid); | |
563 | } | |
fe4477ee JD |
564 | if (out_fd < 0) { |
565 | PERROR("open stream path %s", path); | |
566 | goto error_open; | |
567 | } | |
568 | ret = out_fd; | |
569 | ||
570 | error_open: | |
309167d2 JD |
571 | free(path_name_suffix); |
572 | error_free_suffix: | |
573 | free(extra); | |
fe4477ee JD |
574 | error: |
575 | return ret; | |
576 | } | |
577 | ||
578 | /* | |
579 | * Change the output tracefile according to the given size and count The | |
580 | * new_count pointer is set during this operation. | |
581 | * | |
582 | * From the consumer, the stream lock MUST be held before calling this function | |
583 | * because we are modifying the stream status. | |
584 | * | |
585 | * Return 0 on success or else a negative value. | |
586 | */ | |
bc182241 | 587 | LTTNG_HIDDEN |
fe4477ee | 588 | int utils_rotate_stream_file(char *path_name, char *file_name, uint64_t size, |
309167d2 JD |
589 | uint64_t count, int uid, int gid, int out_fd, uint64_t *new_count, |
590 | int *stream_fd) | |
fe4477ee JD |
591 | { |
592 | int ret; | |
593 | ||
309167d2 JD |
594 | assert(new_count); |
595 | assert(stream_fd); | |
596 | ||
fe4477ee JD |
597 | ret = close(out_fd); |
598 | if (ret < 0) { | |
599 | PERROR("Closing tracefile"); | |
600 | goto error; | |
601 | } | |
602 | ||
603 | if (count > 0) { | |
604 | *new_count = (*new_count + 1) % count; | |
605 | } else { | |
606 | (*new_count)++; | |
607 | } | |
608 | ||
309167d2 JD |
609 | ret = utils_create_stream_file(path_name, file_name, size, *new_count, |
610 | uid, gid, 0); | |
611 | if (ret < 0) { | |
612 | goto error; | |
613 | } | |
614 | *stream_fd = ret; | |
615 | ||
616 | /* Success. */ | |
617 | ret = 0; | |
618 | ||
fe4477ee JD |
619 | error: |
620 | return ret; | |
621 | } | |
70d0b120 SM |
622 | |
623 | /** | |
624 | * Prints the error message corresponding to a regex error code. | |
625 | * | |
626 | * @param errcode The error code. | |
627 | * @param regex The regex object that produced the error code. | |
628 | */ | |
629 | static void regex_print_error(int errcode, regex_t *regex) | |
630 | { | |
631 | /* Get length of error message and allocate accordingly */ | |
632 | size_t length; | |
633 | char *buffer; | |
634 | ||
635 | assert(regex != NULL); | |
636 | ||
637 | length = regerror(errcode, regex, NULL, 0); | |
638 | if (length == 0) { | |
639 | ERR("regerror returned a length of 0"); | |
640 | return; | |
641 | } | |
642 | ||
643 | buffer = zmalloc(length); | |
644 | if (!buffer) { | |
645 | ERR("regex_print_error: zmalloc failed"); | |
646 | return; | |
647 | } | |
648 | ||
649 | /* Get and print error message */ | |
650 | regerror(errcode, regex, buffer, length); | |
651 | ERR("regex error: %s\n", buffer); | |
652 | free(buffer); | |
653 | ||
654 | } | |
655 | ||
656 | /** | |
657 | * Parse a string that represents a size in human readable format. It | |
658 | * supports decimal integers suffixed by 'k', 'M' or 'G'. | |
659 | * | |
660 | * The suffix multiply the integer by: | |
661 | * 'k': 1024 | |
662 | * 'M': 1024^2 | |
663 | * 'G': 1024^3 | |
664 | * | |
665 | * @param str The string to parse. | |
666 | * @param size Pointer to a size_t that will be filled with the | |
cfa9a5a2 | 667 | * resulting size. |
70d0b120 SM |
668 | * |
669 | * @return 0 on success, -1 on failure. | |
670 | */ | |
00a52467 | 671 | LTTNG_HIDDEN |
70d0b120 SM |
672 | int utils_parse_size_suffix(char *str, uint64_t *size) |
673 | { | |
674 | regex_t regex; | |
675 | int ret; | |
676 | const int nmatch = 3; | |
677 | regmatch_t suffix_match, matches[nmatch]; | |
678 | unsigned long long base_size; | |
679 | long shift = 0; | |
680 | ||
681 | if (!str) { | |
682 | return 0; | |
683 | } | |
684 | ||
685 | /* Compile regex */ | |
686 | ret = regcomp(®ex, "^\\(0x\\)\\{0,1\\}[0-9][0-9]*\\([kKMG]\\{0,1\\}\\)$", 0); | |
687 | if (ret != 0) { | |
688 | regex_print_error(ret, ®ex); | |
689 | ret = -1; | |
690 | goto end; | |
691 | } | |
692 | ||
693 | /* Match regex */ | |
694 | ret = regexec(®ex, str, nmatch, matches, 0); | |
695 | if (ret != 0) { | |
696 | ret = -1; | |
697 | goto free; | |
698 | } | |
699 | ||
700 | /* There is a match ! */ | |
701 | errno = 0; | |
702 | base_size = strtoull(str, NULL, 0); | |
703 | if (errno != 0) { | |
704 | PERROR("strtoull"); | |
705 | ret = -1; | |
706 | goto free; | |
707 | } | |
708 | ||
709 | /* Check if there is a suffix */ | |
710 | suffix_match = matches[2]; | |
711 | if (suffix_match.rm_eo - suffix_match.rm_so == 1) { | |
712 | switch (*(str + suffix_match.rm_so)) { | |
713 | case 'K': | |
714 | case 'k': | |
715 | shift = KIBI_LOG2; | |
716 | break; | |
717 | case 'M': | |
718 | shift = MEBI_LOG2; | |
719 | break; | |
720 | case 'G': | |
721 | shift = GIBI_LOG2; | |
722 | break; | |
723 | default: | |
724 | ERR("parse_human_size: invalid suffix"); | |
725 | ret = -1; | |
726 | goto free; | |
727 | } | |
728 | } | |
729 | ||
730 | *size = base_size << shift; | |
731 | ||
732 | /* Check for overflow */ | |
733 | if ((*size >> shift) != base_size) { | |
734 | ERR("parse_size_suffix: oops, overflow detected."); | |
735 | ret = -1; | |
736 | goto free; | |
737 | } | |
738 | ||
739 | ret = 0; | |
740 | ||
741 | free: | |
742 | regfree(®ex); | |
743 | end: | |
744 | return ret; | |
745 | } | |
cfa9a5a2 DG |
746 | |
747 | /* | |
748 | * fls: returns the position of the most significant bit. | |
749 | * Returns 0 if no bit is set, else returns the position of the most | |
750 | * significant bit (from 1 to 32 on 32-bit, from 1 to 64 on 64-bit). | |
751 | */ | |
752 | #if defined(__i386) || defined(__x86_64) | |
753 | static inline unsigned int fls_u32(uint32_t x) | |
754 | { | |
755 | int r; | |
756 | ||
757 | asm("bsrl %1,%0\n\t" | |
758 | "jnz 1f\n\t" | |
759 | "movl $-1,%0\n\t" | |
760 | "1:\n\t" | |
761 | : "=r" (r) : "rm" (x)); | |
762 | return r + 1; | |
763 | } | |
764 | #define HAS_FLS_U32 | |
765 | #endif | |
766 | ||
767 | #ifndef HAS_FLS_U32 | |
768 | static __attribute__((unused)) unsigned int fls_u32(uint32_t x) | |
769 | { | |
770 | unsigned int r = 32; | |
771 | ||
772 | if (!x) { | |
773 | return 0; | |
774 | } | |
775 | if (!(x & 0xFFFF0000U)) { | |
776 | x <<= 16; | |
777 | r -= 16; | |
778 | } | |
779 | if (!(x & 0xFF000000U)) { | |
780 | x <<= 8; | |
781 | r -= 8; | |
782 | } | |
783 | if (!(x & 0xF0000000U)) { | |
784 | x <<= 4; | |
785 | r -= 4; | |
786 | } | |
787 | if (!(x & 0xC0000000U)) { | |
788 | x <<= 2; | |
789 | r -= 2; | |
790 | } | |
791 | if (!(x & 0x80000000U)) { | |
792 | x <<= 1; | |
793 | r -= 1; | |
794 | } | |
795 | return r; | |
796 | } | |
797 | #endif | |
798 | ||
799 | /* | |
800 | * Return the minimum order for which x <= (1UL << order). | |
801 | * Return -1 if x is 0. | |
802 | */ | |
803 | LTTNG_HIDDEN | |
804 | int utils_get_count_order_u32(uint32_t x) | |
805 | { | |
806 | if (!x) { | |
807 | return -1; | |
808 | } | |
809 | ||
810 | return fls_u32(x - 1); | |
811 | } | |
feb0f3e5 AM |
812 | |
813 | /** | |
814 | * Obtain the value of LTTNG_HOME environment variable, if exists. | |
815 | * Otherwise returns the value of HOME. | |
816 | */ | |
00a52467 | 817 | LTTNG_HIDDEN |
feb0f3e5 AM |
818 | char *utils_get_home_dir(void) |
819 | { | |
820 | char *val = NULL; | |
821 | val = getenv(DEFAULT_LTTNG_HOME_ENV_VAR); | |
822 | if (val != NULL) { | |
823 | return val; | |
824 | } | |
825 | return getenv(DEFAULT_LTTNG_FALLBACK_HOME_ENV_VAR); | |
826 | } | |
26fe5938 DG |
827 | |
828 | /* | |
829 | * With the given format, fill dst with the time of len maximum siz. | |
830 | * | |
831 | * Return amount of bytes set in the buffer or else 0 on error. | |
832 | */ | |
833 | LTTNG_HIDDEN | |
834 | size_t utils_get_current_time_str(const char *format, char *dst, size_t len) | |
835 | { | |
836 | size_t ret; | |
837 | time_t rawtime; | |
838 | struct tm *timeinfo; | |
839 | ||
840 | assert(format); | |
841 | assert(dst); | |
842 | ||
843 | /* Get date and time for session path */ | |
844 | time(&rawtime); | |
845 | timeinfo = localtime(&rawtime); | |
846 | ret = strftime(dst, len, format, timeinfo); | |
847 | if (ret == 0) { | |
848 | ERR("Unable to strftime with format %s at dst %p of len %lu", format, | |
849 | dst, len); | |
850 | } | |
851 | ||
852 | return ret; | |
853 | } | |
6c71277b MD |
854 | |
855 | /* | |
856 | * Return the group ID matching name, else 0 if it cannot be found. | |
857 | */ | |
858 | LTTNG_HIDDEN | |
859 | gid_t utils_get_group_id(const char *name) | |
860 | { | |
861 | struct group *grp; | |
862 | ||
863 | grp = getgrnam(name); | |
864 | if (!grp) { | |
865 | static volatile int warn_once; | |
866 | ||
867 | if (!warn_once) { | |
868 | WARN("No tracing group detected"); | |
869 | warn_once = 1; | |
870 | } | |
871 | return 0; | |
872 | } | |
873 | return grp->gr_gid; | |
874 | } |