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