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> |
81b86775 DG |
30 | |
31 | #include <common/common.h> | |
fe4477ee | 32 | #include <common/runas.h> |
81b86775 DG |
33 | |
34 | #include "utils.h" | |
feb0f3e5 | 35 | #include "defaults.h" |
81b86775 DG |
36 | |
37 | /* | |
38 | * Return the realpath(3) of the path even if the last directory token does not | |
39 | * exist. For example, with /tmp/test1/test2, if test2/ does not exist but the | |
40 | * /tmp/test1 does, the real path is returned. In normal time, realpath(3) | |
41 | * fails if the end point directory does not exist. | |
42 | */ | |
90e535ef | 43 | LTTNG_HIDDEN |
81b86775 DG |
44 | char *utils_expand_path(const char *path) |
45 | { | |
46 | const char *end_path = path; | |
47 | char *next, *cut_path = NULL, *expanded_path = NULL; | |
48 | ||
49 | /* Safety net */ | |
50 | if (path == NULL) { | |
51 | goto error; | |
52 | } | |
53 | ||
54 | /* Find last token delimited by '/' */ | |
55 | while ((next = strpbrk(end_path + 1, "/"))) { | |
56 | end_path = next; | |
57 | } | |
58 | ||
59 | /* Cut last token from original path */ | |
60 | cut_path = strndup(path, end_path - path); | |
61 | ||
62 | expanded_path = zmalloc(PATH_MAX); | |
63 | if (expanded_path == NULL) { | |
64 | PERROR("zmalloc expand path"); | |
65 | goto error; | |
66 | } | |
67 | ||
68 | expanded_path = realpath((char *)cut_path, expanded_path); | |
69 | if (expanded_path == NULL) { | |
70 | switch (errno) { | |
71 | case ENOENT: | |
72 | ERR("%s: No such file or directory", cut_path); | |
73 | break; | |
74 | default: | |
75 | PERROR("realpath utils expand path"); | |
76 | break; | |
77 | } | |
78 | goto error; | |
79 | } | |
80 | ||
81 | /* Add end part to expanded path */ | |
c30ce0b3 | 82 | strncat(expanded_path, end_path, PATH_MAX - strlen(expanded_path) - 1); |
81b86775 DG |
83 | |
84 | free(cut_path); | |
85 | return expanded_path; | |
86 | ||
87 | error: | |
88 | free(expanded_path); | |
89 | free(cut_path); | |
90 | return NULL; | |
91 | } | |
92 | ||
93 | /* | |
94 | * Create a pipe in dst. | |
95 | */ | |
90e535ef | 96 | LTTNG_HIDDEN |
81b86775 DG |
97 | int utils_create_pipe(int *dst) |
98 | { | |
99 | int ret; | |
100 | ||
101 | if (dst == NULL) { | |
102 | return -1; | |
103 | } | |
104 | ||
105 | ret = pipe(dst); | |
106 | if (ret < 0) { | |
107 | PERROR("create pipe"); | |
108 | } | |
109 | ||
110 | return ret; | |
111 | } | |
112 | ||
113 | /* | |
114 | * Create pipe and set CLOEXEC flag to both fd. | |
115 | * | |
116 | * Make sure the pipe opened by this function are closed at some point. Use | |
117 | * utils_close_pipe(). | |
118 | */ | |
90e535ef | 119 | LTTNG_HIDDEN |
81b86775 DG |
120 | int utils_create_pipe_cloexec(int *dst) |
121 | { | |
122 | int ret, i; | |
123 | ||
124 | if (dst == NULL) { | |
125 | return -1; | |
126 | } | |
127 | ||
128 | ret = utils_create_pipe(dst); | |
129 | if (ret < 0) { | |
130 | goto error; | |
131 | } | |
132 | ||
133 | for (i = 0; i < 2; i++) { | |
134 | ret = fcntl(dst[i], F_SETFD, FD_CLOEXEC); | |
135 | if (ret < 0) { | |
136 | PERROR("fcntl pipe cloexec"); | |
137 | goto error; | |
138 | } | |
139 | } | |
140 | ||
141 | error: | |
142 | return ret; | |
143 | } | |
144 | ||
145 | /* | |
146 | * Close both read and write side of the pipe. | |
147 | */ | |
90e535ef | 148 | LTTNG_HIDDEN |
81b86775 DG |
149 | void utils_close_pipe(int *src) |
150 | { | |
151 | int i, ret; | |
152 | ||
153 | if (src == NULL) { | |
154 | return; | |
155 | } | |
156 | ||
157 | for (i = 0; i < 2; i++) { | |
158 | /* Safety check */ | |
159 | if (src[i] < 0) { | |
160 | continue; | |
161 | } | |
162 | ||
163 | ret = close(src[i]); | |
164 | if (ret) { | |
165 | PERROR("close pipe"); | |
166 | } | |
167 | } | |
168 | } | |
a4b92340 DG |
169 | |
170 | /* | |
171 | * Create a new string using two strings range. | |
172 | */ | |
90e535ef | 173 | LTTNG_HIDDEN |
a4b92340 DG |
174 | char *utils_strdupdelim(const char *begin, const char *end) |
175 | { | |
176 | char *str; | |
177 | ||
178 | str = zmalloc(end - begin + 1); | |
179 | if (str == NULL) { | |
180 | PERROR("zmalloc strdupdelim"); | |
181 | goto error; | |
182 | } | |
183 | ||
184 | memcpy(str, begin, end - begin); | |
185 | str[end - begin] = '\0'; | |
186 | ||
187 | error: | |
188 | return str; | |
189 | } | |
b662582b DG |
190 | |
191 | /* | |
192 | * Set CLOEXEC flag to the give file descriptor. | |
193 | */ | |
90e535ef | 194 | LTTNG_HIDDEN |
b662582b DG |
195 | int utils_set_fd_cloexec(int fd) |
196 | { | |
197 | int ret; | |
198 | ||
199 | if (fd < 0) { | |
200 | ret = -EINVAL; | |
201 | goto end; | |
202 | } | |
203 | ||
204 | ret = fcntl(fd, F_SETFD, FD_CLOEXEC); | |
205 | if (ret < 0) { | |
206 | PERROR("fcntl cloexec"); | |
207 | ret = -errno; | |
208 | } | |
209 | ||
210 | end: | |
211 | return ret; | |
212 | } | |
35f90c40 DG |
213 | |
214 | /* | |
215 | * Create pid file to the given path and filename. | |
216 | */ | |
90e535ef | 217 | LTTNG_HIDDEN |
35f90c40 DG |
218 | int utils_create_pid_file(pid_t pid, const char *filepath) |
219 | { | |
220 | int ret; | |
221 | FILE *fp; | |
222 | ||
223 | assert(filepath); | |
224 | ||
225 | fp = fopen(filepath, "w"); | |
226 | if (fp == NULL) { | |
227 | PERROR("open pid file %s", filepath); | |
228 | ret = -1; | |
229 | goto error; | |
230 | } | |
231 | ||
232 | ret = fprintf(fp, "%d\n", pid); | |
233 | if (ret < 0) { | |
234 | PERROR("fprintf pid file"); | |
235 | } | |
236 | ||
237 | fclose(fp); | |
238 | DBG("Pid %d written in file %s", pid, filepath); | |
239 | error: | |
240 | return ret; | |
241 | } | |
2d851108 DG |
242 | |
243 | /* | |
244 | * Recursively create directory using the given path and mode. | |
245 | * | |
246 | * On success, return 0 else a negative error code. | |
247 | */ | |
90e535ef | 248 | LTTNG_HIDDEN |
2d851108 DG |
249 | int utils_mkdir_recursive(const char *path, mode_t mode) |
250 | { | |
251 | char *p, tmp[PATH_MAX]; | |
2d851108 DG |
252 | size_t len; |
253 | int ret; | |
254 | ||
255 | assert(path); | |
256 | ||
257 | ret = snprintf(tmp, sizeof(tmp), "%s", path); | |
258 | if (ret < 0) { | |
259 | PERROR("snprintf mkdir"); | |
260 | goto error; | |
261 | } | |
262 | ||
263 | len = ret; | |
264 | if (tmp[len - 1] == '/') { | |
265 | tmp[len - 1] = 0; | |
266 | } | |
267 | ||
268 | for (p = tmp + 1; *p; p++) { | |
269 | if (*p == '/') { | |
270 | *p = 0; | |
271 | if (tmp[strlen(tmp) - 1] == '.' && | |
272 | tmp[strlen(tmp) - 2] == '.' && | |
273 | tmp[strlen(tmp) - 3] == '/') { | |
274 | ERR("Using '/../' is not permitted in the trace path (%s)", | |
275 | tmp); | |
276 | ret = -1; | |
277 | goto error; | |
278 | } | |
0c7bcad5 | 279 | ret = mkdir(tmp, mode); |
2d851108 | 280 | if (ret < 0) { |
0c7bcad5 MD |
281 | if (errno != EEXIST) { |
282 | PERROR("mkdir recursive"); | |
283 | ret = -errno; | |
284 | goto error; | |
2d851108 DG |
285 | } |
286 | } | |
287 | *p = '/'; | |
288 | } | |
289 | } | |
290 | ||
291 | ret = mkdir(tmp, mode); | |
292 | if (ret < 0) { | |
293 | if (errno != EEXIST) { | |
294 | PERROR("mkdir recursive last piece"); | |
295 | ret = -errno; | |
296 | } else { | |
297 | ret = 0; | |
298 | } | |
299 | } | |
300 | ||
301 | error: | |
302 | return ret; | |
303 | } | |
fe4477ee JD |
304 | |
305 | /* | |
306 | * Create the stream tracefile on disk. | |
307 | * | |
308 | * Return 0 on success or else a negative value. | |
309 | */ | |
bc182241 | 310 | LTTNG_HIDDEN |
fe4477ee JD |
311 | int utils_create_stream_file(char *path_name, char *file_name, uint64_t size, |
312 | uint64_t count, int uid, int gid) | |
313 | { | |
be96a7d1 | 314 | int ret, out_fd, flags, mode; |
fe4477ee JD |
315 | char full_path[PATH_MAX], *path_name_id = NULL, *path; |
316 | ||
317 | assert(path_name); | |
318 | assert(file_name); | |
319 | ||
320 | ret = snprintf(full_path, sizeof(full_path), "%s/%s", | |
321 | path_name, file_name); | |
322 | if (ret < 0) { | |
323 | PERROR("snprintf create output file"); | |
324 | goto error; | |
325 | } | |
326 | ||
327 | /* | |
328 | * If we split the trace in multiple files, we have to add the count at the | |
329 | * end of the tracefile name | |
330 | */ | |
331 | if (size > 0) { | |
332 | ret = asprintf(&path_name_id, "%s_%" PRIu64, full_path, count); | |
333 | if (ret < 0) { | |
334 | PERROR("Allocating path name ID"); | |
335 | goto error; | |
336 | } | |
337 | path = path_name_id; | |
338 | } else { | |
339 | path = full_path; | |
340 | } | |
341 | ||
be96a7d1 | 342 | flags = O_WRONLY | O_CREAT | O_TRUNC; |
0f907de1 | 343 | /* Open with 660 mode */ |
be96a7d1 DG |
344 | mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP; |
345 | ||
346 | if (uid < 0 || gid < 0) { | |
347 | out_fd = open(path, flags, mode); | |
348 | } else { | |
349 | out_fd = run_as_open(path, flags, mode, uid, gid); | |
350 | } | |
fe4477ee JD |
351 | if (out_fd < 0) { |
352 | PERROR("open stream path %s", path); | |
353 | goto error_open; | |
354 | } | |
355 | ret = out_fd; | |
356 | ||
357 | error_open: | |
358 | free(path_name_id); | |
359 | error: | |
360 | return ret; | |
361 | } | |
362 | ||
363 | /* | |
364 | * Change the output tracefile according to the given size and count The | |
365 | * new_count pointer is set during this operation. | |
366 | * | |
367 | * From the consumer, the stream lock MUST be held before calling this function | |
368 | * because we are modifying the stream status. | |
369 | * | |
370 | * Return 0 on success or else a negative value. | |
371 | */ | |
bc182241 | 372 | LTTNG_HIDDEN |
fe4477ee JD |
373 | int utils_rotate_stream_file(char *path_name, char *file_name, uint64_t size, |
374 | uint64_t count, int uid, int gid, int out_fd, uint64_t *new_count) | |
375 | { | |
376 | int ret; | |
377 | ||
378 | ret = close(out_fd); | |
379 | if (ret < 0) { | |
380 | PERROR("Closing tracefile"); | |
381 | goto error; | |
382 | } | |
383 | ||
384 | if (count > 0) { | |
385 | *new_count = (*new_count + 1) % count; | |
386 | } else { | |
387 | (*new_count)++; | |
388 | } | |
389 | ||
390 | return utils_create_stream_file(path_name, file_name, size, *new_count, | |
391 | uid, gid); | |
392 | error: | |
393 | return ret; | |
394 | } | |
70d0b120 SM |
395 | |
396 | /** | |
397 | * Prints the error message corresponding to a regex error code. | |
398 | * | |
399 | * @param errcode The error code. | |
400 | * @param regex The regex object that produced the error code. | |
401 | */ | |
402 | static void regex_print_error(int errcode, regex_t *regex) | |
403 | { | |
404 | /* Get length of error message and allocate accordingly */ | |
405 | size_t length; | |
406 | char *buffer; | |
407 | ||
408 | assert(regex != NULL); | |
409 | ||
410 | length = regerror(errcode, regex, NULL, 0); | |
411 | if (length == 0) { | |
412 | ERR("regerror returned a length of 0"); | |
413 | return; | |
414 | } | |
415 | ||
416 | buffer = zmalloc(length); | |
417 | if (!buffer) { | |
418 | ERR("regex_print_error: zmalloc failed"); | |
419 | return; | |
420 | } | |
421 | ||
422 | /* Get and print error message */ | |
423 | regerror(errcode, regex, buffer, length); | |
424 | ERR("regex error: %s\n", buffer); | |
425 | free(buffer); | |
426 | ||
427 | } | |
428 | ||
429 | /** | |
430 | * Parse a string that represents a size in human readable format. It | |
431 | * supports decimal integers suffixed by 'k', 'M' or 'G'. | |
432 | * | |
433 | * The suffix multiply the integer by: | |
434 | * 'k': 1024 | |
435 | * 'M': 1024^2 | |
436 | * 'G': 1024^3 | |
437 | * | |
438 | * @param str The string to parse. | |
439 | * @param size Pointer to a size_t that will be filled with the | |
cfa9a5a2 | 440 | * resulting size. |
70d0b120 SM |
441 | * |
442 | * @return 0 on success, -1 on failure. | |
443 | */ | |
444 | int utils_parse_size_suffix(char *str, uint64_t *size) | |
445 | { | |
446 | regex_t regex; | |
447 | int ret; | |
448 | const int nmatch = 3; | |
449 | regmatch_t suffix_match, matches[nmatch]; | |
450 | unsigned long long base_size; | |
451 | long shift = 0; | |
452 | ||
453 | if (!str) { | |
454 | return 0; | |
455 | } | |
456 | ||
457 | /* Compile regex */ | |
458 | ret = regcomp(®ex, "^\\(0x\\)\\{0,1\\}[0-9][0-9]*\\([kKMG]\\{0,1\\}\\)$", 0); | |
459 | if (ret != 0) { | |
460 | regex_print_error(ret, ®ex); | |
461 | ret = -1; | |
462 | goto end; | |
463 | } | |
464 | ||
465 | /* Match regex */ | |
466 | ret = regexec(®ex, str, nmatch, matches, 0); | |
467 | if (ret != 0) { | |
468 | ret = -1; | |
469 | goto free; | |
470 | } | |
471 | ||
472 | /* There is a match ! */ | |
473 | errno = 0; | |
474 | base_size = strtoull(str, NULL, 0); | |
475 | if (errno != 0) { | |
476 | PERROR("strtoull"); | |
477 | ret = -1; | |
478 | goto free; | |
479 | } | |
480 | ||
481 | /* Check if there is a suffix */ | |
482 | suffix_match = matches[2]; | |
483 | if (suffix_match.rm_eo - suffix_match.rm_so == 1) { | |
484 | switch (*(str + suffix_match.rm_so)) { | |
485 | case 'K': | |
486 | case 'k': | |
487 | shift = KIBI_LOG2; | |
488 | break; | |
489 | case 'M': | |
490 | shift = MEBI_LOG2; | |
491 | break; | |
492 | case 'G': | |
493 | shift = GIBI_LOG2; | |
494 | break; | |
495 | default: | |
496 | ERR("parse_human_size: invalid suffix"); | |
497 | ret = -1; | |
498 | goto free; | |
499 | } | |
500 | } | |
501 | ||
502 | *size = base_size << shift; | |
503 | ||
504 | /* Check for overflow */ | |
505 | if ((*size >> shift) != base_size) { | |
506 | ERR("parse_size_suffix: oops, overflow detected."); | |
507 | ret = -1; | |
508 | goto free; | |
509 | } | |
510 | ||
511 | ret = 0; | |
512 | ||
513 | free: | |
514 | regfree(®ex); | |
515 | end: | |
516 | return ret; | |
517 | } | |
cfa9a5a2 DG |
518 | |
519 | /* | |
520 | * fls: returns the position of the most significant bit. | |
521 | * Returns 0 if no bit is set, else returns the position of the most | |
522 | * significant bit (from 1 to 32 on 32-bit, from 1 to 64 on 64-bit). | |
523 | */ | |
524 | #if defined(__i386) || defined(__x86_64) | |
525 | static inline unsigned int fls_u32(uint32_t x) | |
526 | { | |
527 | int r; | |
528 | ||
529 | asm("bsrl %1,%0\n\t" | |
530 | "jnz 1f\n\t" | |
531 | "movl $-1,%0\n\t" | |
532 | "1:\n\t" | |
533 | : "=r" (r) : "rm" (x)); | |
534 | return r + 1; | |
535 | } | |
536 | #define HAS_FLS_U32 | |
537 | #endif | |
538 | ||
539 | #ifndef HAS_FLS_U32 | |
540 | static __attribute__((unused)) unsigned int fls_u32(uint32_t x) | |
541 | { | |
542 | unsigned int r = 32; | |
543 | ||
544 | if (!x) { | |
545 | return 0; | |
546 | } | |
547 | if (!(x & 0xFFFF0000U)) { | |
548 | x <<= 16; | |
549 | r -= 16; | |
550 | } | |
551 | if (!(x & 0xFF000000U)) { | |
552 | x <<= 8; | |
553 | r -= 8; | |
554 | } | |
555 | if (!(x & 0xF0000000U)) { | |
556 | x <<= 4; | |
557 | r -= 4; | |
558 | } | |
559 | if (!(x & 0xC0000000U)) { | |
560 | x <<= 2; | |
561 | r -= 2; | |
562 | } | |
563 | if (!(x & 0x80000000U)) { | |
564 | x <<= 1; | |
565 | r -= 1; | |
566 | } | |
567 | return r; | |
568 | } | |
569 | #endif | |
570 | ||
571 | /* | |
572 | * Return the minimum order for which x <= (1UL << order). | |
573 | * Return -1 if x is 0. | |
574 | */ | |
575 | LTTNG_HIDDEN | |
576 | int utils_get_count_order_u32(uint32_t x) | |
577 | { | |
578 | if (!x) { | |
579 | return -1; | |
580 | } | |
581 | ||
582 | return fls_u32(x - 1); | |
583 | } | |
feb0f3e5 AM |
584 | |
585 | /** | |
586 | * Obtain the value of LTTNG_HOME environment variable, if exists. | |
587 | * Otherwise returns the value of HOME. | |
588 | */ | |
589 | char *utils_get_home_dir(void) | |
590 | { | |
591 | char *val = NULL; | |
592 | val = getenv(DEFAULT_LTTNG_HOME_ENV_VAR); | |
593 | if (val != NULL) { | |
594 | return val; | |
595 | } | |
596 | return getenv(DEFAULT_LTTNG_FALLBACK_HOME_ENV_VAR); | |
597 | } |