]>
Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
a5c32cff HH |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
11c3a366 TA |
21 | #include <errno.h> |
22 | #include <fcntl.h> | |
23 | #include <limits.h> | |
24 | #include <stdarg.h> | |
25 | #include <stdint.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <sys/stat.h> | |
29 | #include <sys/types.h> | |
a5c32cff | 30 | #include <unistd.h> |
cda134ab | 31 | |
b5efdb8a | 32 | #include "alloc-util.h" |
4f5dd394 | 33 | #include "ctype.h" |
f4b51a2d | 34 | #include "def.h" |
99003e01 | 35 | #include "env-util.h" |
4f5dd394 | 36 | #include "escape.h" |
3ffd4af2 LP |
37 | #include "fd-util.h" |
38 | #include "fileio.h" | |
f4f15635 | 39 | #include "fs-util.h" |
0d39fa9c | 40 | #include "hexdecoct.h" |
93cc7779 TA |
41 | #include "log.h" |
42 | #include "macro.h" | |
1d9ed171 | 43 | #include "missing.h" |
33d52ab9 | 44 | #include "parse-util.h" |
0d39fa9c | 45 | #include "path-util.h" |
df0ff127 | 46 | #include "process-util.h" |
0d39fa9c | 47 | #include "random-util.h" |
33d52ab9 | 48 | #include "stdio-util.h" |
07630cea | 49 | #include "string-util.h" |
a5c32cff | 50 | #include "strv.h" |
93cc7779 | 51 | #include "time-util.h" |
affb60b1 | 52 | #include "umask-util.h" |
335c46b5 | 53 | #include "utf8.h" |
a5c32cff | 54 | |
c2d11a63 VC |
55 | #define READ_FULL_BYTES_MAX (4U*1024U*1024U) |
56 | ||
b1837133 LP |
57 | int write_string_stream_ts( |
58 | FILE *f, | |
59 | const char *line, | |
60 | WriteStringFileFlags flags, | |
61 | struct timespec *ts) { | |
dacd6cee | 62 | |
717603e3 LP |
63 | assert(f); |
64 | assert(line); | |
65 | ||
fec6fc6b | 66 | fputs(line, f); |
b1837133 | 67 | if (!(flags & WRITE_STRING_FILE_AVOID_NEWLINE) && !endswith(line, "\n")) |
a5c32cff HH |
68 | fputc('\n', f); |
69 | ||
39c38d77 ZJS |
70 | if (ts) { |
71 | struct timespec twice[2] = {*ts, *ts}; | |
72 | ||
73 | if (futimens(fileno(f), twice) < 0) | |
74 | return -errno; | |
75 | } | |
76 | ||
9dd1b1e8 LP |
77 | if (flags & WRITE_STRING_FILE_SYNC) |
78 | return fflush_sync_and_check(f); | |
79 | else | |
80 | return fflush_and_check(f); | |
a5c32cff HH |
81 | } |
82 | ||
2eabcc77 LP |
83 | static int write_string_file_atomic( |
84 | const char *fn, | |
85 | const char *line, | |
b1837133 | 86 | WriteStringFileFlags flags, |
2eabcc77 LP |
87 | struct timespec *ts) { |
88 | ||
a5c32cff HH |
89 | _cleanup_fclose_ FILE *f = NULL; |
90 | _cleanup_free_ char *p = NULL; | |
91 | int r; | |
92 | ||
93 | assert(fn); | |
94 | assert(line); | |
95 | ||
96 | r = fopen_temporary(fn, &f, &p); | |
97 | if (r < 0) | |
98 | return r; | |
99 | ||
0d39fa9c | 100 | (void) fchmod_umask(fileno(f), 0644); |
a5c32cff | 101 | |
b1837133 | 102 | r = write_string_stream_ts(f, line, flags, ts); |
9dd1b1e8 LP |
103 | if (r < 0) |
104 | goto fail; | |
105 | ||
106 | if (rename(p, fn) < 0) { | |
107 | r = -errno; | |
108 | goto fail; | |
a5c32cff HH |
109 | } |
110 | ||
9dd1b1e8 | 111 | return 0; |
a5c32cff | 112 | |
9dd1b1e8 LP |
113 | fail: |
114 | (void) unlink(p); | |
a5c32cff HH |
115 | return r; |
116 | } | |
117 | ||
b1837133 LP |
118 | int write_string_file_ts( |
119 | const char *fn, | |
120 | const char *line, | |
121 | WriteStringFileFlags flags, | |
122 | struct timespec *ts) { | |
123 | ||
4c1fc3e4 | 124 | _cleanup_fclose_ FILE *f = NULL; |
eb3da901 | 125 | int q, r; |
4c1fc3e4 DM |
126 | |
127 | assert(fn); | |
128 | assert(line); | |
129 | ||
265710c2 AJ |
130 | /* We don't know how to verify whether the file contents was already on-disk. */ |
131 | assert(!((flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE) && (flags & WRITE_STRING_FILE_SYNC))); | |
0675e94a | 132 | |
4c1fc3e4 DM |
133 | if (flags & WRITE_STRING_FILE_ATOMIC) { |
134 | assert(flags & WRITE_STRING_FILE_CREATE); | |
135 | ||
b1837133 | 136 | r = write_string_file_atomic(fn, line, flags, ts); |
eb3da901 LP |
137 | if (r < 0) |
138 | goto fail; | |
139 | ||
140 | return r; | |
39c38d77 ZJS |
141 | } else |
142 | assert(ts == NULL); | |
4c1fc3e4 DM |
143 | |
144 | if (flags & WRITE_STRING_FILE_CREATE) { | |
145 | f = fopen(fn, "we"); | |
eb3da901 LP |
146 | if (!f) { |
147 | r = -errno; | |
148 | goto fail; | |
149 | } | |
4c1fc3e4 DM |
150 | } else { |
151 | int fd; | |
152 | ||
153 | /* We manually build our own version of fopen(..., "we") that | |
154 | * works without O_CREAT */ | |
155 | fd = open(fn, O_WRONLY|O_CLOEXEC|O_NOCTTY); | |
eb3da901 LP |
156 | if (fd < 0) { |
157 | r = -errno; | |
158 | goto fail; | |
159 | } | |
4c1fc3e4 DM |
160 | |
161 | f = fdopen(fd, "we"); | |
162 | if (!f) { | |
eb3da901 | 163 | r = -errno; |
4c1fc3e4 | 164 | safe_close(fd); |
eb3da901 | 165 | goto fail; |
4c1fc3e4 DM |
166 | } |
167 | } | |
168 | ||
b1837133 | 169 | r = write_string_stream_ts(f, line, flags, ts); |
eb3da901 LP |
170 | if (r < 0) |
171 | goto fail; | |
172 | ||
173 | return 0; | |
174 | ||
175 | fail: | |
176 | if (!(flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE)) | |
177 | return r; | |
178 | ||
179 | f = safe_fclose(f); | |
180 | ||
181 | /* OK, the operation failed, but let's see if the right | |
182 | * contents in place already. If so, eat up the error. */ | |
183 | ||
184 | q = verify_file(fn, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE)); | |
185 | if (q <= 0) | |
186 | return r; | |
187 | ||
188 | return 0; | |
4c1fc3e4 DM |
189 | } |
190 | ||
a5c32cff HH |
191 | int read_one_line_file(const char *fn, char **line) { |
192 | _cleanup_fclose_ FILE *f = NULL; | |
2e33df93 | 193 | int r; |
a5c32cff HH |
194 | |
195 | assert(fn); | |
196 | assert(line); | |
197 | ||
198 | f = fopen(fn, "re"); | |
199 | if (!f) | |
200 | return -errno; | |
201 | ||
2e33df93 ZJS |
202 | r = read_line(f, LONG_LINE_MAX, line); |
203 | return r < 0 ? r : 0; | |
a5c32cff HH |
204 | } |
205 | ||
eb3da901 LP |
206 | int verify_file(const char *fn, const char *blob, bool accept_extra_nl) { |
207 | _cleanup_fclose_ FILE *f = NULL; | |
208 | _cleanup_free_ char *buf = NULL; | |
209 | size_t l, k; | |
15dee3f0 | 210 | |
eb3da901 LP |
211 | assert(fn); |
212 | assert(blob); | |
213 | ||
214 | l = strlen(blob); | |
215 | ||
216 | if (accept_extra_nl && endswith(blob, "\n")) | |
217 | accept_extra_nl = false; | |
218 | ||
219 | buf = malloc(l + accept_extra_nl + 1); | |
220 | if (!buf) | |
221 | return -ENOMEM; | |
222 | ||
223 | f = fopen(fn, "re"); | |
224 | if (!f) | |
225 | return -errno; | |
226 | ||
227 | /* We try to read one byte more than we need, so that we know whether we hit eof */ | |
228 | errno = 0; | |
229 | k = fread(buf, 1, l + accept_extra_nl + 1, f); | |
230 | if (ferror(f)) | |
231 | return errno > 0 ? -errno : -EIO; | |
232 | ||
233 | if (k != l && k != l + accept_extra_nl) | |
234 | return 0; | |
235 | if (memcmp(buf, blob, l) != 0) | |
236 | return 0; | |
237 | if (k > l && buf[l] != '\n') | |
238 | return 0; | |
15dee3f0 | 239 | |
eb3da901 | 240 | return 1; |
15dee3f0 LP |
241 | } |
242 | ||
717603e3 | 243 | int read_full_stream(FILE *f, char **contents, size_t *size) { |
a5c32cff HH |
244 | size_t n, l; |
245 | _cleanup_free_ char *buf = NULL; | |
246 | struct stat st; | |
247 | ||
717603e3 | 248 | assert(f); |
a5c32cff HH |
249 | assert(contents); |
250 | ||
a5c32cff HH |
251 | if (fstat(fileno(f), &st) < 0) |
252 | return -errno; | |
253 | ||
717603e3 | 254 | n = LINE_MAX; |
a5c32cff | 255 | |
717603e3 LP |
256 | if (S_ISREG(st.st_mode)) { |
257 | ||
258 | /* Safety check */ | |
c2d11a63 | 259 | if (st.st_size > READ_FULL_BYTES_MAX) |
717603e3 LP |
260 | return -E2BIG; |
261 | ||
ff0e7e05 LP |
262 | /* Start with the right file size, but be prepared for files from /proc which generally report a file |
263 | * size of 0. Note that we increase the size to read here by one, so that the first read attempt | |
264 | * already makes us notice the EOF. */ | |
717603e3 | 265 | if (st.st_size > 0) |
ff0e7e05 | 266 | n = st.st_size + 1; |
717603e3 | 267 | } |
a5c32cff | 268 | |
717603e3 | 269 | l = 0; |
a5c32cff HH |
270 | for (;;) { |
271 | char *t; | |
272 | size_t k; | |
273 | ||
c2d11a63 | 274 | t = realloc(buf, n + 1); |
a5c32cff HH |
275 | if (!t) |
276 | return -ENOMEM; | |
277 | ||
278 | buf = t; | |
5a89faf0 | 279 | errno = 0; |
a5c32cff | 280 | k = fread(buf + l, 1, n - l, f); |
c2d11a63 VC |
281 | if (k > 0) |
282 | l += k; | |
a5c32cff | 283 | |
c2d11a63 | 284 | if (ferror(f)) |
5a89faf0 | 285 | return errno > 0 ? -errno : -EIO; |
a5c32cff | 286 | |
c2d11a63 | 287 | if (feof(f)) |
a5c32cff | 288 | break; |
a5c32cff | 289 | |
c2d11a63 VC |
290 | /* We aren't expecting fread() to return a short read outside |
291 | * of (error && eof), assert buffer is full and enlarge buffer. | |
292 | */ | |
293 | assert(l == n); | |
a5c32cff HH |
294 | |
295 | /* Safety check */ | |
c2d11a63 | 296 | if (n >= READ_FULL_BYTES_MAX) |
a5c32cff | 297 | return -E2BIG; |
c2d11a63 | 298 | |
82b103a7 | 299 | n = MIN(n * 2, READ_FULL_BYTES_MAX); |
a5c32cff HH |
300 | } |
301 | ||
302 | buf[l] = 0; | |
303 | *contents = buf; | |
d78a28e3 | 304 | buf = NULL; /* do not free */ |
a5c32cff HH |
305 | |
306 | if (size) | |
307 | *size = l; | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
717603e3 LP |
312 | int read_full_file(const char *fn, char **contents, size_t *size) { |
313 | _cleanup_fclose_ FILE *f = NULL; | |
314 | ||
315 | assert(fn); | |
316 | assert(contents); | |
317 | ||
318 | f = fopen(fn, "re"); | |
319 | if (!f) | |
320 | return -errno; | |
321 | ||
322 | return read_full_stream(f, contents, size); | |
323 | } | |
324 | ||
f73141d7 | 325 | static int parse_env_file_internal( |
717603e3 | 326 | FILE *f, |
a5c32cff | 327 | const char *fname, |
f73141d7 | 328 | const char *newline, |
335c46b5 | 329 | int (*push) (const char *filename, unsigned line, |
a5f6c30d MS |
330 | const char *key, char *value, void *userdata, int *n_pushed), |
331 | void *userdata, | |
332 | int *n_pushed) { | |
f73141d7 LP |
333 | |
334 | _cleanup_free_ char *contents = NULL, *key = NULL; | |
2b77f67e | 335 | size_t key_alloc = 0, n_key = 0, value_alloc = 0, n_value = 0, last_value_whitespace = (size_t) -1, last_key_whitespace = (size_t) -1; |
f73141d7 LP |
336 | char *p, *value = NULL; |
337 | int r; | |
335c46b5 | 338 | unsigned line = 1; |
a5c32cff | 339 | |
f73141d7 LP |
340 | enum { |
341 | PRE_KEY, | |
342 | KEY, | |
f73141d7 LP |
343 | PRE_VALUE, |
344 | VALUE, | |
345 | VALUE_ESCAPE, | |
346 | SINGLE_QUOTE_VALUE, | |
347 | SINGLE_QUOTE_VALUE_ESCAPE, | |
348 | DOUBLE_QUOTE_VALUE, | |
349 | DOUBLE_QUOTE_VALUE_ESCAPE, | |
350 | COMMENT, | |
351 | COMMENT_ESCAPE | |
352 | } state = PRE_KEY; | |
a5c32cff | 353 | |
f73141d7 | 354 | assert(newline); |
a5c32cff | 355 | |
717603e3 LP |
356 | if (f) |
357 | r = read_full_stream(f, &contents, NULL); | |
358 | else | |
359 | r = read_full_file(fname, &contents, NULL); | |
1c17cbed | 360 | if (r < 0) |
a5c32cff HH |
361 | return r; |
362 | ||
f73141d7 LP |
363 | for (p = contents; *p; p++) { |
364 | char c = *p; | |
365 | ||
366 | switch (state) { | |
367 | ||
368 | case PRE_KEY: | |
ebc05a09 | 369 | if (strchr(COMMENTS, c)) |
f73141d7 LP |
370 | state = COMMENT; |
371 | else if (!strchr(WHITESPACE, c)) { | |
372 | state = KEY; | |
2b77f67e LP |
373 | last_key_whitespace = (size_t) -1; |
374 | ||
ca2d3784 | 375 | if (!GREEDY_REALLOC(key, key_alloc, n_key+2)) { |
f73141d7 LP |
376 | r = -ENOMEM; |
377 | goto fail; | |
378 | } | |
379 | ||
380 | key[n_key++] = c; | |
381 | } | |
382 | break; | |
383 | ||
384 | case KEY: | |
385 | if (strchr(newline, c)) { | |
386 | state = PRE_KEY; | |
313cefa1 | 387 | line++; |
f73141d7 | 388 | n_key = 0; |
2b77f67e | 389 | } else if (c == '=') { |
f73141d7 | 390 | state = PRE_VALUE; |
2b77f67e LP |
391 | last_value_whitespace = (size_t) -1; |
392 | } else { | |
393 | if (!strchr(WHITESPACE, c)) | |
394 | last_key_whitespace = (size_t) -1; | |
395 | else if (last_key_whitespace == (size_t) -1) | |
396 | last_key_whitespace = n_key; | |
397 | ||
ca2d3784 | 398 | if (!GREEDY_REALLOC(key, key_alloc, n_key+2)) { |
f73141d7 LP |
399 | r = -ENOMEM; |
400 | goto fail; | |
401 | } | |
402 | ||
403 | key[n_key++] = c; | |
404 | } | |
a5c32cff | 405 | |
f73141d7 LP |
406 | break; |
407 | ||
f73141d7 | 408 | case PRE_VALUE: |
98f59e59 | 409 | if (strchr(newline, c)) { |
f73141d7 | 410 | state = PRE_KEY; |
313cefa1 | 411 | line++; |
f73141d7 | 412 | key[n_key] = 0; |
a5c32cff | 413 | |
f73141d7 LP |
414 | if (value) |
415 | value[n_value] = 0; | |
a5c32cff | 416 | |
ebc05a09 | 417 | /* strip trailing whitespace from key */ |
2b77f67e LP |
418 | if (last_key_whitespace != (size_t) -1) |
419 | key[last_key_whitespace] = 0; | |
ebc05a09 | 420 | |
a5f6c30d | 421 | r = push(fname, line, key, value, userdata, n_pushed); |
f73141d7 LP |
422 | if (r < 0) |
423 | goto fail; | |
424 | ||
425 | n_key = 0; | |
426 | value = NULL; | |
427 | value_alloc = n_value = 0; | |
2b77f67e | 428 | |
f73141d7 LP |
429 | } else if (c == '\'') |
430 | state = SINGLE_QUOTE_VALUE; | |
431 | else if (c == '\"') | |
432 | state = DOUBLE_QUOTE_VALUE; | |
433 | else if (c == '\\') | |
434 | state = VALUE_ESCAPE; | |
435 | else if (!strchr(WHITESPACE, c)) { | |
436 | state = VALUE; | |
437 | ||
ca2d3784 | 438 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
439 | r = -ENOMEM; |
440 | goto fail; | |
441 | } | |
442 | ||
443 | value[n_value++] = c; | |
444 | } | |
445 | ||
446 | break; | |
447 | ||
448 | case VALUE: | |
449 | if (strchr(newline, c)) { | |
450 | state = PRE_KEY; | |
313cefa1 | 451 | line++; |
98f59e59 | 452 | |
f73141d7 LP |
453 | key[n_key] = 0; |
454 | ||
455 | if (value) | |
456 | value[n_value] = 0; | |
457 | ||
2b77f67e LP |
458 | /* Chomp off trailing whitespace from value */ |
459 | if (last_value_whitespace != (size_t) -1) | |
460 | value[last_value_whitespace] = 0; | |
f73141d7 | 461 | |
ebc05a09 | 462 | /* strip trailing whitespace from key */ |
2b77f67e LP |
463 | if (last_key_whitespace != (size_t) -1) |
464 | key[last_key_whitespace] = 0; | |
ebc05a09 | 465 | |
a5f6c30d | 466 | r = push(fname, line, key, value, userdata, n_pushed); |
f73141d7 LP |
467 | if (r < 0) |
468 | goto fail; | |
469 | ||
470 | n_key = 0; | |
471 | value = NULL; | |
472 | value_alloc = n_value = 0; | |
2b77f67e | 473 | |
f73141d7 LP |
474 | } else if (c == '\\') { |
475 | state = VALUE_ESCAPE; | |
2b77f67e | 476 | last_value_whitespace = (size_t) -1; |
f73141d7 LP |
477 | } else { |
478 | if (!strchr(WHITESPACE, c)) | |
2b77f67e LP |
479 | last_value_whitespace = (size_t) -1; |
480 | else if (last_value_whitespace == (size_t) -1) | |
481 | last_value_whitespace = n_value; | |
f73141d7 | 482 | |
ca2d3784 | 483 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
484 | r = -ENOMEM; |
485 | goto fail; | |
486 | } | |
487 | ||
488 | value[n_value++] = c; | |
489 | } | |
490 | ||
491 | break; | |
492 | ||
493 | case VALUE_ESCAPE: | |
494 | state = VALUE; | |
495 | ||
496 | if (!strchr(newline, c)) { | |
497 | /* Escaped newlines we eat up entirely */ | |
ca2d3784 | 498 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
499 | r = -ENOMEM; |
500 | goto fail; | |
501 | } | |
502 | ||
503 | value[n_value++] = c; | |
504 | } | |
505 | break; | |
506 | ||
507 | case SINGLE_QUOTE_VALUE: | |
508 | if (c == '\'') | |
509 | state = PRE_VALUE; | |
510 | else if (c == '\\') | |
511 | state = SINGLE_QUOTE_VALUE_ESCAPE; | |
512 | else { | |
ca2d3784 | 513 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
514 | r = -ENOMEM; |
515 | goto fail; | |
516 | } | |
a5c32cff | 517 | |
f73141d7 LP |
518 | value[n_value++] = c; |
519 | } | |
a5c32cff | 520 | |
f73141d7 | 521 | break; |
a5c32cff | 522 | |
f73141d7 LP |
523 | case SINGLE_QUOTE_VALUE_ESCAPE: |
524 | state = SINGLE_QUOTE_VALUE; | |
a5c32cff | 525 | |
f73141d7 | 526 | if (!strchr(newline, c)) { |
ca2d3784 | 527 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
a5c32cff | 528 | r = -ENOMEM; |
a5c32cff HH |
529 | goto fail; |
530 | } | |
531 | ||
f73141d7 LP |
532 | value[n_value++] = c; |
533 | } | |
534 | break; | |
535 | ||
536 | case DOUBLE_QUOTE_VALUE: | |
537 | if (c == '\"') | |
538 | state = PRE_VALUE; | |
539 | else if (c == '\\') | |
540 | state = DOUBLE_QUOTE_VALUE_ESCAPE; | |
541 | else { | |
ca2d3784 | 542 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
543 | r = -ENOMEM; |
544 | goto fail; | |
a5c32cff HH |
545 | } |
546 | ||
f73141d7 LP |
547 | value[n_value++] = c; |
548 | } | |
549 | ||
550 | break; | |
551 | ||
552 | case DOUBLE_QUOTE_VALUE_ESCAPE: | |
553 | state = DOUBLE_QUOTE_VALUE; | |
a5c32cff | 554 | |
f73141d7 | 555 | if (!strchr(newline, c)) { |
ca2d3784 | 556 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
557 | r = -ENOMEM; |
558 | goto fail; | |
559 | } | |
a5c32cff | 560 | |
f73141d7 | 561 | value[n_value++] = c; |
a5c32cff | 562 | } |
f73141d7 LP |
563 | break; |
564 | ||
565 | case COMMENT: | |
566 | if (c == '\\') | |
567 | state = COMMENT_ESCAPE; | |
335c46b5 | 568 | else if (strchr(newline, c)) { |
f73141d7 | 569 | state = PRE_KEY; |
313cefa1 | 570 | line++; |
335c46b5 | 571 | } |
f73141d7 LP |
572 | break; |
573 | ||
574 | case COMMENT_ESCAPE: | |
575 | state = COMMENT; | |
576 | break; | |
a5c32cff | 577 | } |
f73141d7 LP |
578 | } |
579 | ||
371328dc ZJS |
580 | if (IN_SET(state, |
581 | PRE_VALUE, | |
582 | VALUE, | |
583 | VALUE_ESCAPE, | |
584 | SINGLE_QUOTE_VALUE, | |
585 | SINGLE_QUOTE_VALUE_ESCAPE, | |
586 | DOUBLE_QUOTE_VALUE, | |
587 | DOUBLE_QUOTE_VALUE_ESCAPE)) { | |
a5c32cff | 588 | |
f73141d7 LP |
589 | key[n_key] = 0; |
590 | ||
591 | if (value) | |
592 | value[n_value] = 0; | |
593 | ||
2b77f67e LP |
594 | if (state == VALUE) |
595 | if (last_value_whitespace != (size_t) -1) | |
596 | value[last_value_whitespace] = 0; | |
597 | ||
ebc05a09 | 598 | /* strip trailing whitespace from key */ |
2b77f67e LP |
599 | if (last_key_whitespace != (size_t) -1) |
600 | key[last_key_whitespace] = 0; | |
ebc05a09 | 601 | |
a5f6c30d | 602 | r = push(fname, line, key, value, userdata, n_pushed); |
f73141d7 LP |
603 | if (r < 0) |
604 | goto fail; | |
a5c32cff HH |
605 | } |
606 | ||
f73141d7 LP |
607 | return 0; |
608 | ||
a5c32cff | 609 | fail: |
f73141d7 | 610 | free(value); |
a5c32cff HH |
611 | return r; |
612 | } | |
613 | ||
ac466818 | 614 | static int check_utf8ness_and_warn( |
717603e3 | 615 | const char *filename, unsigned line, |
ac466818 | 616 | const char *key, char *value) { |
f27f0e21 GB |
617 | |
618 | if (!utf8_is_valid(key)) { | |
3587161a | 619 | _cleanup_free_ char *p = NULL; |
550a40ec | 620 | |
717603e3 LP |
621 | p = utf8_escape_invalid(key); |
622 | log_error("%s:%u: invalid UTF-8 in key '%s', ignoring.", strna(filename), line, p); | |
f27f0e21 GB |
623 | return -EINVAL; |
624 | } | |
625 | ||
626 | if (value && !utf8_is_valid(value)) { | |
3587161a | 627 | _cleanup_free_ char *p = NULL; |
550a40ec | 628 | |
717603e3 LP |
629 | p = utf8_escape_invalid(value); |
630 | log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, p); | |
f27f0e21 GB |
631 | return -EINVAL; |
632 | } | |
a5c32cff | 633 | |
ac466818 ZJS |
634 | return 0; |
635 | } | |
636 | ||
637 | static int parse_env_file_push( | |
638 | const char *filename, unsigned line, | |
639 | const char *key, char *value, | |
640 | void *userdata, | |
641 | int *n_pushed) { | |
642 | ||
643 | const char *k; | |
644 | va_list aq, *ap = userdata; | |
645 | int r; | |
646 | ||
647 | r = check_utf8ness_and_warn(filename, line, key, value); | |
648 | if (r < 0) | |
649 | return r; | |
650 | ||
f27f0e21 | 651 | va_copy(aq, *ap); |
a5c32cff | 652 | |
f27f0e21 GB |
653 | while ((k = va_arg(aq, const char *))) { |
654 | char **v; | |
a5c32cff | 655 | |
f27f0e21 | 656 | v = va_arg(aq, char **); |
a5c32cff | 657 | |
f27f0e21 GB |
658 | if (streq(key, k)) { |
659 | va_end(aq); | |
660 | free(*v); | |
661 | *v = value; | |
a5f6c30d MS |
662 | |
663 | if (n_pushed) | |
664 | (*n_pushed)++; | |
665 | ||
f27f0e21 | 666 | return 1; |
f73141d7 | 667 | } |
335c46b5 | 668 | } |
a5c32cff | 669 | |
f27f0e21 | 670 | va_end(aq); |
f73141d7 | 671 | free(value); |
717603e3 | 672 | |
f73141d7 LP |
673 | return 0; |
674 | } | |
a5c32cff | 675 | |
f73141d7 LP |
676 | int parse_env_file( |
677 | const char *fname, | |
678 | const char *newline, ...) { | |
a5c32cff | 679 | |
f73141d7 | 680 | va_list ap; |
a5f6c30d | 681 | int r, n_pushed = 0; |
a5c32cff | 682 | |
f73141d7 LP |
683 | if (!newline) |
684 | newline = NEWLINE; | |
a5c32cff | 685 | |
f73141d7 | 686 | va_start(ap, newline); |
a5f6c30d | 687 | r = parse_env_file_internal(NULL, fname, newline, parse_env_file_push, &ap, &n_pushed); |
f73141d7 | 688 | va_end(ap); |
a5c32cff | 689 | |
a5f6c30d | 690 | return r < 0 ? r : n_pushed; |
f73141d7 | 691 | } |
a5c32cff | 692 | |
717603e3 LP |
693 | static int load_env_file_push( |
694 | const char *filename, unsigned line, | |
695 | const char *key, char *value, | |
a5f6c30d MS |
696 | void *userdata, |
697 | int *n_pushed) { | |
f27f0e21 GB |
698 | char ***m = userdata; |
699 | char *p; | |
700 | int r; | |
a5c32cff | 701 | |
ac466818 ZJS |
702 | r = check_utf8ness_and_warn(filename, line, key, value); |
703 | if (r < 0) | |
704 | return r; | |
a5c32cff | 705 | |
99003e01 | 706 | p = strjoin(key, "=", value); |
f27f0e21 GB |
707 | if (!p) |
708 | return -ENOMEM; | |
335c46b5 | 709 | |
99003e01 ZJS |
710 | r = strv_env_replace(m, p); |
711 | if (r < 0) { | |
712 | free(p); | |
f27f0e21 | 713 | return r; |
99003e01 | 714 | } |
a5c32cff | 715 | |
a5f6c30d MS |
716 | if (n_pushed) |
717 | (*n_pushed)++; | |
718 | ||
f73141d7 LP |
719 | free(value); |
720 | return 0; | |
721 | } | |
722 | ||
717603e3 LP |
723 | int load_env_file(FILE *f, const char *fname, const char *newline, char ***rl) { |
724 | char **m = NULL; | |
725 | int r; | |
726 | ||
727 | if (!newline) | |
728 | newline = NEWLINE; | |
729 | ||
a5f6c30d | 730 | r = parse_env_file_internal(f, fname, newline, load_env_file_push, &m, NULL); |
717603e3 LP |
731 | if (r < 0) { |
732 | strv_free(m); | |
733 | return r; | |
734 | } | |
735 | ||
736 | *rl = m; | |
737 | return 0; | |
738 | } | |
739 | ||
740 | static int load_env_file_push_pairs( | |
741 | const char *filename, unsigned line, | |
742 | const char *key, char *value, | |
a5f6c30d MS |
743 | void *userdata, |
744 | int *n_pushed) { | |
717603e3 LP |
745 | char ***m = userdata; |
746 | int r; | |
747 | ||
ac466818 ZJS |
748 | r = check_utf8ness_and_warn(filename, line, key, value); |
749 | if (r < 0) | |
750 | return r; | |
717603e3 LP |
751 | |
752 | r = strv_extend(m, key); | |
753 | if (r < 0) | |
754 | return -ENOMEM; | |
755 | ||
756 | if (!value) { | |
757 | r = strv_extend(m, ""); | |
758 | if (r < 0) | |
759 | return -ENOMEM; | |
760 | } else { | |
761 | r = strv_push(m, value); | |
762 | if (r < 0) | |
763 | return r; | |
764 | } | |
765 | ||
a5f6c30d MS |
766 | if (n_pushed) |
767 | (*n_pushed)++; | |
768 | ||
717603e3 LP |
769 | return 0; |
770 | } | |
771 | ||
772 | int load_env_file_pairs(FILE *f, const char *fname, const char *newline, char ***rl) { | |
f73141d7 LP |
773 | char **m = NULL; |
774 | int r; | |
a5c32cff | 775 | |
f73141d7 LP |
776 | if (!newline) |
777 | newline = NEWLINE; | |
778 | ||
a5f6c30d | 779 | r = parse_env_file_internal(f, fname, newline, load_env_file_push_pairs, &m, NULL); |
f73141d7 LP |
780 | if (r < 0) { |
781 | strv_free(m); | |
782 | return r; | |
a5c32cff HH |
783 | } |
784 | ||
785 | *rl = m; | |
a5c32cff HH |
786 | return 0; |
787 | } | |
788 | ||
37f3ffca RS |
789 | static int merge_env_file_push( |
790 | const char *filename, unsigned line, | |
791 | const char *key, char *value, | |
792 | void *userdata, | |
793 | int *n_pushed) { | |
794 | ||
795 | char ***env = userdata; | |
796 | char *expanded_value; | |
797 | ||
798 | assert(env); | |
799 | ||
184d1904 ZJS |
800 | if (!value) { |
801 | log_error("%s:%u: invalid syntax (around \"%s\"), ignoring.", strna(filename), line, key); | |
802 | return 0; | |
803 | } | |
804 | ||
805 | if (!env_name_is_valid(key)) { | |
806 | log_error("%s:%u: invalid variable name \"%s\", ignoring.", strna(filename), line, key); | |
2ea8081a | 807 | free(value); |
184d1904 ZJS |
808 | return 0; |
809 | } | |
810 | ||
ccad1fd0 | 811 | expanded_value = replace_env(value, *env, |
b82f58bf RS |
812 | REPLACE_ENV_USE_ENVIRONMENT| |
813 | REPLACE_ENV_ALLOW_BRACELESS| | |
814 | REPLACE_ENV_ALLOW_EXTENDED); | |
37f3ffca RS |
815 | if (!expanded_value) |
816 | return -ENOMEM; | |
817 | ||
818 | free_and_replace(value, expanded_value); | |
819 | ||
820 | return load_env_file_push(filename, line, key, value, env, n_pushed); | |
821 | } | |
822 | ||
823 | int merge_env_file( | |
824 | char ***env, | |
825 | FILE *f, | |
826 | const char *fname) { | |
827 | ||
ccad1fd0 | 828 | /* NOTE: this function supports braceful and braceless variable expansions, |
b82f58bf | 829 | * plus "extended" substitutions, unlike other exported parsing functions. |
ccad1fd0 ZJS |
830 | */ |
831 | ||
37f3ffca RS |
832 | return parse_env_file_internal(f, fname, NEWLINE, merge_env_file_push, env, NULL); |
833 | } | |
834 | ||
768100ef LP |
835 | static void write_env_var(FILE *f, const char *v) { |
836 | const char *p; | |
837 | ||
838 | p = strchr(v, '='); | |
839 | if (!p) { | |
840 | /* Fallback */ | |
4b61c875 LP |
841 | fputs_unlocked(v, f); |
842 | fputc_unlocked('\n', f); | |
768100ef LP |
843 | return; |
844 | } | |
845 | ||
846 | p++; | |
4b61c875 | 847 | fwrite_unlocked(v, 1, p-v, f); |
768100ef | 848 | |
0ce5a806 | 849 | if (string_has_cc(p, NULL) || chars_intersect(p, WHITESPACE SHELL_NEED_QUOTES)) { |
4b61c875 | 850 | fputc_unlocked('\"', f); |
768100ef LP |
851 | |
852 | for (; *p; p++) { | |
0ce5a806 | 853 | if (strchr(SHELL_NEED_ESCAPE, *p)) |
4b61c875 | 854 | fputc_unlocked('\\', f); |
768100ef | 855 | |
4b61c875 | 856 | fputc_unlocked(*p, f); |
768100ef LP |
857 | } |
858 | ||
4b61c875 | 859 | fputc_unlocked('\"', f); |
768100ef | 860 | } else |
4b61c875 | 861 | fputs_unlocked(p, f); |
768100ef | 862 | |
4b61c875 | 863 | fputc_unlocked('\n', f); |
768100ef LP |
864 | } |
865 | ||
a5c32cff | 866 | int write_env_file(const char *fname, char **l) { |
7fd1b19b | 867 | _cleanup_fclose_ FILE *f = NULL; |
736937e5 LP |
868 | _cleanup_free_ char *p = NULL; |
869 | char **i; | |
a5c32cff HH |
870 | int r; |
871 | ||
736937e5 LP |
872 | assert(fname); |
873 | ||
a5c32cff HH |
874 | r = fopen_temporary(fname, &f, &p); |
875 | if (r < 0) | |
876 | return r; | |
877 | ||
878 | fchmod_umask(fileno(f), 0644); | |
879 | ||
768100ef LP |
880 | STRV_FOREACH(i, l) |
881 | write_env_var(f, *i); | |
a5c32cff | 882 | |
736937e5 LP |
883 | r = fflush_and_check(f); |
884 | if (r >= 0) { | |
885 | if (rename(p, fname) >= 0) | |
886 | return 0; | |
a5c32cff | 887 | |
736937e5 | 888 | r = -errno; |
a5c32cff HH |
889 | } |
890 | ||
736937e5 | 891 | unlink(p); |
a5c32cff HH |
892 | return r; |
893 | } | |
68fee104 ZJS |
894 | |
895 | int executable_is_script(const char *path, char **interpreter) { | |
896 | int r; | |
c8b32e11 | 897 | _cleanup_free_ char *line = NULL; |
68fee104 ZJS |
898 | int len; |
899 | char *ans; | |
900 | ||
901 | assert(path); | |
902 | ||
903 | r = read_one_line_file(path, &line); | |
904 | if (r < 0) | |
905 | return r; | |
906 | ||
907 | if (!startswith(line, "#!")) | |
908 | return 0; | |
909 | ||
910 | ans = strstrip(line + 2); | |
911 | len = strcspn(ans, " \t"); | |
912 | ||
913 | if (len == 0) | |
914 | return 0; | |
915 | ||
916 | ans = strndup(ans, len); | |
917 | if (!ans) | |
918 | return -ENOMEM; | |
919 | ||
920 | *interpreter = ans; | |
921 | return 1; | |
922 | } | |
69ab8088 ZJS |
923 | |
924 | /** | |
0a7b53bd | 925 | * Retrieve one field from a file like /proc/self/status. pattern |
c4cd1d4d AK |
926 | * should not include whitespace or the delimiter (':'). pattern matches only |
927 | * the beginning of a line. Whitespace before ':' is skipped. Whitespace and | |
928 | * zeros after the ':' will be skipped. field must be freed afterwards. | |
929 | * terminator specifies the terminating characters of the field value (not | |
930 | * included in the value). | |
69ab8088 | 931 | */ |
c4cd1d4d | 932 | int get_proc_field(const char *filename, const char *pattern, const char *terminator, char **field) { |
69ab8088 | 933 | _cleanup_free_ char *status = NULL; |
90110825 | 934 | char *t, *f; |
69ab8088 ZJS |
935 | size_t len; |
936 | int r; | |
937 | ||
c4cd1d4d | 938 | assert(terminator); |
69ab8088 | 939 | assert(filename); |
7ff7394d | 940 | assert(pattern); |
69ab8088 ZJS |
941 | assert(field); |
942 | ||
943 | r = read_full_file(filename, &status, NULL); | |
944 | if (r < 0) | |
945 | return r; | |
946 | ||
c4cd1d4d AK |
947 | t = status; |
948 | ||
949 | do { | |
950 | bool pattern_ok; | |
951 | ||
952 | do { | |
953 | t = strstr(t, pattern); | |
954 | if (!t) | |
955 | return -ENOENT; | |
956 | ||
957 | /* Check that pattern occurs in beginning of line. */ | |
958 | pattern_ok = (t == status || t[-1] == '\n'); | |
959 | ||
960 | t += strlen(pattern); | |
961 | ||
962 | } while (!pattern_ok); | |
963 | ||
964 | t += strspn(t, " \t"); | |
965 | if (!*t) | |
966 | return -ENOENT; | |
967 | ||
968 | } while (*t != ':'); | |
969 | ||
970 | t++; | |
69ab8088 | 971 | |
4ec29144 | 972 | if (*t) { |
1e5413f7 ZJS |
973 | t += strspn(t, " \t"); |
974 | ||
975 | /* Also skip zeros, because when this is used for | |
976 | * capabilities, we don't want the zeros. This way the | |
977 | * same capability set always maps to the same string, | |
978 | * irrespective of the total capability set size. For | |
979 | * other numbers it shouldn't matter. */ | |
980 | t += strspn(t, "0"); | |
4ec29144 ZJS |
981 | /* Back off one char if there's nothing but whitespace |
982 | and zeros */ | |
1e5413f7 | 983 | if (!*t || isspace(*t)) |
313cefa1 | 984 | t--; |
4ec29144 | 985 | } |
69ab8088 | 986 | |
c4cd1d4d | 987 | len = strcspn(t, terminator); |
69ab8088 | 988 | |
90110825 LP |
989 | f = strndup(t, len); |
990 | if (!f) | |
69ab8088 ZJS |
991 | return -ENOMEM; |
992 | ||
90110825 | 993 | *field = f; |
69ab8088 ZJS |
994 | return 0; |
995 | } | |
0d39fa9c LP |
996 | |
997 | DIR *xopendirat(int fd, const char *name, int flags) { | |
998 | int nfd; | |
999 | DIR *d; | |
1000 | ||
1001 | assert(!(flags & O_CREAT)); | |
1002 | ||
1003 | nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags, 0); | |
1004 | if (nfd < 0) | |
1005 | return NULL; | |
1006 | ||
1007 | d = fdopendir(nfd); | |
1008 | if (!d) { | |
1009 | safe_close(nfd); | |
1010 | return NULL; | |
1011 | } | |
1012 | ||
1013 | return d; | |
1014 | } | |
1015 | ||
1016 | static int search_and_fopen_internal(const char *path, const char *mode, const char *root, char **search, FILE **_f) { | |
1017 | char **i; | |
1018 | ||
1019 | assert(path); | |
1020 | assert(mode); | |
1021 | assert(_f); | |
1022 | ||
1023 | if (!path_strv_resolve_uniq(search, root)) | |
1024 | return -ENOMEM; | |
1025 | ||
1026 | STRV_FOREACH(i, search) { | |
1027 | _cleanup_free_ char *p = NULL; | |
1028 | FILE *f; | |
1029 | ||
1030 | if (root) | |
605405c6 | 1031 | p = strjoin(root, *i, "/", path); |
0d39fa9c | 1032 | else |
605405c6 | 1033 | p = strjoin(*i, "/", path); |
0d39fa9c LP |
1034 | if (!p) |
1035 | return -ENOMEM; | |
1036 | ||
1037 | f = fopen(p, mode); | |
1038 | if (f) { | |
1039 | *_f = f; | |
1040 | return 0; | |
1041 | } | |
1042 | ||
1043 | if (errno != ENOENT) | |
1044 | return -errno; | |
1045 | } | |
1046 | ||
1047 | return -ENOENT; | |
1048 | } | |
1049 | ||
1050 | int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f) { | |
1051 | _cleanup_strv_free_ char **copy = NULL; | |
1052 | ||
1053 | assert(path); | |
1054 | assert(mode); | |
1055 | assert(_f); | |
1056 | ||
1057 | if (path_is_absolute(path)) { | |
1058 | FILE *f; | |
1059 | ||
1060 | f = fopen(path, mode); | |
1061 | if (f) { | |
1062 | *_f = f; | |
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | return -errno; | |
1067 | } | |
1068 | ||
1069 | copy = strv_copy((char**) search); | |
1070 | if (!copy) | |
1071 | return -ENOMEM; | |
1072 | ||
1073 | return search_and_fopen_internal(path, mode, root, copy, _f); | |
1074 | } | |
1075 | ||
1076 | int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f) { | |
1077 | _cleanup_strv_free_ char **s = NULL; | |
1078 | ||
1079 | if (path_is_absolute(path)) { | |
1080 | FILE *f; | |
1081 | ||
1082 | f = fopen(path, mode); | |
1083 | if (f) { | |
1084 | *_f = f; | |
1085 | return 0; | |
1086 | } | |
1087 | ||
1088 | return -errno; | |
1089 | } | |
1090 | ||
1091 | s = strv_split_nulstr(search); | |
1092 | if (!s) | |
1093 | return -ENOMEM; | |
1094 | ||
1095 | return search_and_fopen_internal(path, mode, root, s, _f); | |
1096 | } | |
1097 | ||
1098 | int fopen_temporary(const char *path, FILE **_f, char **_temp_path) { | |
1099 | FILE *f; | |
1100 | char *t; | |
1101 | int r, fd; | |
1102 | ||
1103 | assert(path); | |
1104 | assert(_f); | |
1105 | assert(_temp_path); | |
1106 | ||
1107 | r = tempfn_xxxxxx(path, NULL, &t); | |
1108 | if (r < 0) | |
1109 | return r; | |
1110 | ||
646853bd | 1111 | fd = mkostemp_safe(t); |
0d39fa9c LP |
1112 | if (fd < 0) { |
1113 | free(t); | |
1114 | return -errno; | |
1115 | } | |
1116 | ||
1117 | f = fdopen(fd, "we"); | |
1118 | if (!f) { | |
1119 | unlink_noerrno(t); | |
1120 | free(t); | |
1121 | safe_close(fd); | |
1122 | return -errno; | |
1123 | } | |
1124 | ||
1125 | *_f = f; | |
1126 | *_temp_path = t; | |
1127 | ||
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | int fflush_and_check(FILE *f) { | |
1132 | assert(f); | |
1133 | ||
1134 | errno = 0; | |
1135 | fflush(f); | |
1136 | ||
1137 | if (ferror(f)) | |
f5e5c28f | 1138 | return errno > 0 ? -errno : -EIO; |
0d39fa9c LP |
1139 | |
1140 | return 0; | |
1141 | } | |
1142 | ||
0675e94a AJ |
1143 | int fflush_sync_and_check(FILE *f) { |
1144 | int r; | |
1145 | ||
1146 | assert(f); | |
1147 | ||
1148 | r = fflush_and_check(f); | |
1149 | if (r < 0) | |
1150 | return r; | |
1151 | ||
1152 | if (fsync(fileno(f)) < 0) | |
1153 | return -errno; | |
1154 | ||
1155 | return 0; | |
1156 | } | |
1157 | ||
61233823 | 1158 | /* This is much like mkostemp() but is subject to umask(). */ |
646853bd | 1159 | int mkostemp_safe(char *pattern) { |
3587161a | 1160 | _cleanup_umask_ mode_t u = 0; |
0d39fa9c LP |
1161 | int fd; |
1162 | ||
1163 | assert(pattern); | |
1164 | ||
1165 | u = umask(077); | |
1166 | ||
646853bd | 1167 | fd = mkostemp(pattern, O_CLOEXEC); |
0d39fa9c LP |
1168 | if (fd < 0) |
1169 | return -errno; | |
1170 | ||
1171 | return fd; | |
1172 | } | |
1173 | ||
0d39fa9c LP |
1174 | int tempfn_xxxxxx(const char *p, const char *extra, char **ret) { |
1175 | const char *fn; | |
1176 | char *t; | |
1177 | ||
1178 | assert(p); | |
1179 | assert(ret); | |
1180 | ||
1181 | /* | |
1182 | * Turns this: | |
1183 | * /foo/bar/waldo | |
1184 | * | |
1185 | * Into this: | |
1186 | * /foo/bar/.#<extra>waldoXXXXXX | |
1187 | */ | |
1188 | ||
1189 | fn = basename(p); | |
1190 | if (!filename_is_valid(fn)) | |
1191 | return -EINVAL; | |
1192 | ||
1193 | if (extra == NULL) | |
1194 | extra = ""; | |
1195 | ||
1196 | t = new(char, strlen(p) + 2 + strlen(extra) + 6 + 1); | |
1197 | if (!t) | |
1198 | return -ENOMEM; | |
1199 | ||
1200 | strcpy(stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn), "XXXXXX"); | |
1201 | ||
1202 | *ret = path_kill_slashes(t); | |
1203 | return 0; | |
1204 | } | |
1205 | ||
1206 | int tempfn_random(const char *p, const char *extra, char **ret) { | |
1207 | const char *fn; | |
1208 | char *t, *x; | |
1209 | uint64_t u; | |
1210 | unsigned i; | |
1211 | ||
1212 | assert(p); | |
1213 | assert(ret); | |
1214 | ||
1215 | /* | |
1216 | * Turns this: | |
1217 | * /foo/bar/waldo | |
1218 | * | |
1219 | * Into this: | |
1220 | * /foo/bar/.#<extra>waldobaa2a261115984a9 | |
1221 | */ | |
1222 | ||
1223 | fn = basename(p); | |
1224 | if (!filename_is_valid(fn)) | |
1225 | return -EINVAL; | |
1226 | ||
1227 | if (!extra) | |
1228 | extra = ""; | |
1229 | ||
1230 | t = new(char, strlen(p) + 2 + strlen(extra) + 16 + 1); | |
1231 | if (!t) | |
1232 | return -ENOMEM; | |
1233 | ||
1234 | x = stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn); | |
1235 | ||
1236 | u = random_u64(); | |
1237 | for (i = 0; i < 16; i++) { | |
1238 | *(x++) = hexchar(u & 0xF); | |
1239 | u >>= 4; | |
1240 | } | |
1241 | ||
1242 | *x = 0; | |
1243 | ||
1244 | *ret = path_kill_slashes(t); | |
1245 | return 0; | |
1246 | } | |
1247 | ||
1248 | int tempfn_random_child(const char *p, const char *extra, char **ret) { | |
1249 | char *t, *x; | |
1250 | uint64_t u; | |
1251 | unsigned i; | |
992e8f22 | 1252 | int r; |
0d39fa9c | 1253 | |
0d39fa9c LP |
1254 | assert(ret); |
1255 | ||
1256 | /* Turns this: | |
1257 | * /foo/bar/waldo | |
1258 | * Into this: | |
1259 | * /foo/bar/waldo/.#<extra>3c2b6219aa75d7d0 | |
1260 | */ | |
1261 | ||
992e8f22 LP |
1262 | if (!p) { |
1263 | r = tmp_dir(&p); | |
1264 | if (r < 0) | |
1265 | return r; | |
1266 | } | |
1267 | ||
0d39fa9c LP |
1268 | if (!extra) |
1269 | extra = ""; | |
1270 | ||
1271 | t = new(char, strlen(p) + 3 + strlen(extra) + 16 + 1); | |
1272 | if (!t) | |
1273 | return -ENOMEM; | |
1274 | ||
1275 | x = stpcpy(stpcpy(stpcpy(t, p), "/.#"), extra); | |
1276 | ||
1277 | u = random_u64(); | |
1278 | for (i = 0; i < 16; i++) { | |
1279 | *(x++) = hexchar(u & 0xF); | |
1280 | u >>= 4; | |
1281 | } | |
1282 | ||
1283 | *x = 0; | |
1284 | ||
1285 | *ret = path_kill_slashes(t); | |
1286 | return 0; | |
1287 | } | |
33d52ab9 LP |
1288 | |
1289 | int write_timestamp_file_atomic(const char *fn, usec_t n) { | |
1290 | char ln[DECIMAL_STR_MAX(n)+2]; | |
1291 | ||
1292 | /* Creates a "timestamp" file, that contains nothing but a | |
1293 | * usec_t timestamp, formatted in ASCII. */ | |
1294 | ||
1295 | if (n <= 0 || n >= USEC_INFINITY) | |
1296 | return -ERANGE; | |
1297 | ||
1298 | xsprintf(ln, USEC_FMT "\n", n); | |
1299 | ||
1300 | return write_string_file(fn, ln, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC); | |
1301 | } | |
1302 | ||
1303 | int read_timestamp_file(const char *fn, usec_t *ret) { | |
1304 | _cleanup_free_ char *ln = NULL; | |
1305 | uint64_t t; | |
1306 | int r; | |
1307 | ||
1308 | r = read_one_line_file(fn, &ln); | |
1309 | if (r < 0) | |
1310 | return r; | |
1311 | ||
1312 | r = safe_atou64(ln, &t); | |
1313 | if (r < 0) | |
1314 | return r; | |
1315 | ||
1316 | if (t <= 0 || t >= (uint64_t) USEC_INFINITY) | |
1317 | return -ERANGE; | |
1318 | ||
1319 | *ret = (usec_t) t; | |
1320 | return 0; | |
1321 | } | |
d390f8ef LP |
1322 | |
1323 | int fputs_with_space(FILE *f, const char *s, const char *separator, bool *space) { | |
1324 | int r; | |
1325 | ||
1326 | assert(s); | |
1327 | ||
1328 | /* Outputs the specified string with fputs(), but optionally prefixes it with a separator. The *space parameter | |
1329 | * when specified shall initially point to a boolean variable initialized to false. It is set to true after the | |
1330 | * first invocation. This call is supposed to be use in loops, where a separator shall be inserted between each | |
1331 | * element, but not before the first one. */ | |
1332 | ||
1333 | if (!f) | |
1334 | f = stdout; | |
1335 | ||
1336 | if (space) { | |
1337 | if (!separator) | |
1338 | separator = " "; | |
1339 | ||
1340 | if (*space) { | |
1341 | r = fputs(separator, f); | |
1342 | if (r < 0) | |
1343 | return r; | |
1344 | } | |
1345 | ||
1346 | *space = true; | |
1347 | } | |
1348 | ||
1349 | return fputs(s, f); | |
1350 | } | |
03532f0a LP |
1351 | |
1352 | int open_tmpfile_unlinkable(const char *directory, int flags) { | |
1353 | char *p; | |
992e8f22 | 1354 | int fd, r; |
03532f0a | 1355 | |
992e8f22 LP |
1356 | if (!directory) { |
1357 | r = tmp_dir(&directory); | |
1358 | if (r < 0) | |
1359 | return r; | |
1360 | } | |
03532f0a LP |
1361 | |
1362 | /* Returns an unlinked temporary file that cannot be linked into the file system anymore */ | |
1363 | ||
03532f0a LP |
1364 | /* Try O_TMPFILE first, if it is supported */ |
1365 | fd = open(directory, flags|O_TMPFILE|O_EXCL, S_IRUSR|S_IWUSR); | |
1366 | if (fd >= 0) | |
1367 | return fd; | |
03532f0a LP |
1368 | |
1369 | /* Fall back to unguessable name + unlinking */ | |
1370 | p = strjoina(directory, "/systemd-tmp-XXXXXX"); | |
1371 | ||
646853bd | 1372 | fd = mkostemp_safe(p); |
03532f0a LP |
1373 | if (fd < 0) |
1374 | return fd; | |
1375 | ||
1376 | (void) unlink(p); | |
1377 | ||
1378 | return fd; | |
1379 | } | |
1380 | ||
1381 | int open_tmpfile_linkable(const char *target, int flags, char **ret_path) { | |
1382 | _cleanup_free_ char *tmp = NULL; | |
1383 | int r, fd; | |
1384 | ||
1385 | assert(target); | |
1386 | assert(ret_path); | |
1387 | ||
1388 | /* Don't allow O_EXCL, as that has a special meaning for O_TMPFILE */ | |
1389 | assert((flags & O_EXCL) == 0); | |
1390 | ||
1391 | /* Creates a temporary file, that shall be renamed to "target" later. If possible, this uses O_TMPFILE – in | |
1392 | * which case "ret_path" will be returned as NULL. If not possible a the tempoary path name used is returned in | |
1393 | * "ret_path". Use link_tmpfile() below to rename the result after writing the file in full. */ | |
1394 | ||
03532f0a LP |
1395 | { |
1396 | _cleanup_free_ char *dn = NULL; | |
1397 | ||
1398 | dn = dirname_malloc(target); | |
1399 | if (!dn) | |
1400 | return -ENOMEM; | |
1401 | ||
1402 | fd = open(dn, O_TMPFILE|flags, 0640); | |
1403 | if (fd >= 0) { | |
1404 | *ret_path = NULL; | |
1405 | return fd; | |
1406 | } | |
1407 | ||
1408 | log_debug_errno(errno, "Failed to use O_TMPFILE on %s: %m", dn); | |
1409 | } | |
03532f0a LP |
1410 | |
1411 | r = tempfn_random(target, NULL, &tmp); | |
1412 | if (r < 0) | |
1413 | return r; | |
1414 | ||
1415 | fd = open(tmp, O_CREAT|O_EXCL|O_NOFOLLOW|O_NOCTTY|flags, 0640); | |
1416 | if (fd < 0) | |
1417 | return -errno; | |
1418 | ||
1419 | *ret_path = tmp; | |
1420 | tmp = NULL; | |
1421 | ||
1422 | return fd; | |
1423 | } | |
1424 | ||
504afd7c ZJS |
1425 | int open_serialization_fd(const char *ident) { |
1426 | int fd = -1; | |
1427 | ||
1428 | fd = memfd_create(ident, MFD_CLOEXEC); | |
1429 | if (fd < 0) { | |
1430 | const char *path; | |
1431 | ||
df0ff127 | 1432 | path = getpid_cached() == 1 ? "/run/systemd" : "/tmp"; |
504afd7c ZJS |
1433 | fd = open_tmpfile_unlinkable(path, O_RDWR|O_CLOEXEC); |
1434 | if (fd < 0) | |
1435 | return fd; | |
1436 | ||
1437 | log_debug("Serializing %s to %s.", ident, path); | |
1438 | } else | |
1439 | log_debug("Serializing %s to memfd.", ident); | |
1440 | ||
1441 | return fd; | |
1442 | } | |
1443 | ||
03532f0a LP |
1444 | int link_tmpfile(int fd, const char *path, const char *target) { |
1445 | ||
1446 | assert(fd >= 0); | |
1447 | assert(target); | |
1448 | ||
1449 | /* Moves a temporary file created with open_tmpfile() above into its final place. if "path" is NULL an fd | |
1450 | * created with O_TMPFILE is assumed, and linkat() is used. Otherwise it is assumed O_TMPFILE is not supported | |
1451 | * on the directory, and renameat2() is used instead. | |
1452 | * | |
f8e2f4d6 | 1453 | * Note that in both cases we will not replace existing files. This is because linkat() does not support this |
03532f0a LP |
1454 | * operation currently (renameat2() does), and there is no nice way to emulate this. */ |
1455 | ||
1456 | if (path) { | |
1457 | if (rename_noreplace(AT_FDCWD, path, AT_FDCWD, target) < 0) | |
1458 | return -errno; | |
1459 | } else { | |
1460 | char proc_fd_path[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(fd) + 1]; | |
1461 | ||
1462 | xsprintf(proc_fd_path, "/proc/self/fd/%i", fd); | |
1463 | ||
1464 | if (linkat(AT_FDCWD, proc_fd_path, AT_FDCWD, target, AT_SYMLINK_FOLLOW) < 0) | |
1465 | return -errno; | |
1466 | } | |
1467 | ||
1468 | return 0; | |
1469 | } | |
03c2b288 LP |
1470 | |
1471 | int read_nul_string(FILE *f, char **ret) { | |
1472 | _cleanup_free_ char *x = NULL; | |
1473 | size_t allocated = 0, n = 0; | |
1474 | ||
1475 | assert(f); | |
1476 | assert(ret); | |
1477 | ||
1478 | /* Reads a NUL-terminated string from the specified file. */ | |
1479 | ||
1480 | for (;;) { | |
1481 | int c; | |
1482 | ||
1483 | if (!GREEDY_REALLOC(x, allocated, n+2)) | |
1484 | return -ENOMEM; | |
1485 | ||
1486 | c = fgetc(f); | |
1487 | if (c == 0) /* Terminate at NUL byte */ | |
1488 | break; | |
1489 | if (c == EOF) { | |
1490 | if (ferror(f)) | |
1491 | return -errno; | |
1492 | break; /* Terminate at EOF */ | |
1493 | } | |
1494 | ||
1495 | x[n++] = (char) c; | |
1496 | } | |
1497 | ||
1498 | if (x) | |
1499 | x[n] = 0; | |
1500 | else { | |
1501 | x = new0(char, 1); | |
1502 | if (!x) | |
1503 | return -ENOMEM; | |
1504 | } | |
1505 | ||
1506 | *ret = x; | |
1507 | x = NULL; | |
1508 | ||
1509 | return 0; | |
1510 | } | |
676bcb0f LP |
1511 | |
1512 | int mkdtemp_malloc(const char *template, char **ret) { | |
1513 | char *p; | |
1514 | ||
1515 | assert(template); | |
1516 | assert(ret); | |
1517 | ||
1518 | p = strdup(template); | |
1519 | if (!p) | |
1520 | return -ENOMEM; | |
1521 | ||
1522 | if (!mkdtemp(p)) { | |
1523 | free(p); | |
1524 | return -errno; | |
1525 | } | |
1526 | ||
1527 | *ret = p; | |
1528 | return 0; | |
1529 | } | |
4f9a66a3 | 1530 | |
57d6f700 | 1531 | DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, funlockfile); |
f858e514 | 1532 | |
4f9a66a3 LP |
1533 | int read_line(FILE *f, size_t limit, char **ret) { |
1534 | _cleanup_free_ char *buffer = NULL; | |
1535 | size_t n = 0, allocated = 0, count = 0; | |
4f9a66a3 LP |
1536 | |
1537 | assert(f); | |
1538 | ||
1539 | /* Something like a bounded version of getline(). | |
1540 | * | |
1541 | * Considers EOF, \n and \0 end of line delimiters, and does not include these delimiters in the string | |
1542 | * returned. | |
1543 | * | |
1544 | * Returns the number of bytes read from the files (i.e. including delimiters — this hence usually differs from | |
1545 | * the number of characters in the returned string). When EOF is hit, 0 is returned. | |
1546 | * | |
1547 | * The input parameter limit is the maximum numbers of characters in the returned string, i.e. excluding | |
1548 | * delimiters. If the limit is hit we fail and return -ENOBUFS. | |
1549 | * | |
1550 | * If a line shall be skipped ret may be initialized as NULL. */ | |
1551 | ||
1552 | if (ret) { | |
1553 | if (!GREEDY_REALLOC(buffer, allocated, 1)) | |
1554 | return -ENOMEM; | |
1555 | } | |
1556 | ||
f858e514 | 1557 | { |
3f691417 | 1558 | _unused_ _cleanup_(funlockfilep) FILE *flocked = f; |
f858e514 | 1559 | flockfile(f); |
4f9a66a3 | 1560 | |
f858e514 ZJS |
1561 | for (;;) { |
1562 | int c; | |
4f9a66a3 | 1563 | |
f858e514 ZJS |
1564 | if (n >= limit) |
1565 | return -ENOBUFS; | |
4f9a66a3 | 1566 | |
f858e514 ZJS |
1567 | errno = 0; |
1568 | c = fgetc_unlocked(f); | |
1569 | if (c == EOF) { | |
1570 | /* if we read an error, and have no data to return, then propagate the error */ | |
1571 | if (ferror_unlocked(f) && n == 0) | |
1572 | return errno > 0 ? -errno : -EIO; | |
1573 | ||
1574 | break; | |
4f9a66a3 LP |
1575 | } |
1576 | ||
f858e514 | 1577 | count++; |
4f9a66a3 | 1578 | |
f858e514 ZJS |
1579 | if (IN_SET(c, '\n', 0)) /* Reached a delimiter */ |
1580 | break; | |
4f9a66a3 | 1581 | |
f858e514 ZJS |
1582 | if (ret) { |
1583 | if (!GREEDY_REALLOC(buffer, allocated, n + 2)) | |
1584 | return -ENOMEM; | |
4f9a66a3 | 1585 | |
f858e514 | 1586 | buffer[n] = (char) c; |
4f9a66a3 LP |
1587 | } |
1588 | ||
f858e514 | 1589 | n++; |
4f9a66a3 | 1590 | } |
4f9a66a3 LP |
1591 | } |
1592 | ||
4f9a66a3 LP |
1593 | if (ret) { |
1594 | buffer[n] = 0; | |
1595 | ||
1596 | *ret = buffer; | |
1597 | buffer = NULL; | |
1598 | } | |
1599 | ||
1600 | return (int) count; | |
1601 | } |