]>
Commit | Line | Data |
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a5c32cff HH |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
11c3a366 TA |
20 | #include <errno.h> |
21 | #include <fcntl.h> | |
22 | #include <limits.h> | |
23 | #include <stdarg.h> | |
24 | #include <stdint.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <sys/stat.h> | |
28 | #include <sys/types.h> | |
a5c32cff | 29 | #include <unistd.h> |
cda134ab | 30 | |
b5efdb8a | 31 | #include "alloc-util.h" |
4f5dd394 | 32 | #include "ctype.h" |
99003e01 | 33 | #include "env-util.h" |
4f5dd394 | 34 | #include "escape.h" |
3ffd4af2 LP |
35 | #include "fd-util.h" |
36 | #include "fileio.h" | |
f4f15635 | 37 | #include "fs-util.h" |
0d39fa9c | 38 | #include "hexdecoct.h" |
93cc7779 TA |
39 | #include "log.h" |
40 | #include "macro.h" | |
1d9ed171 | 41 | #include "missing.h" |
33d52ab9 | 42 | #include "parse-util.h" |
0d39fa9c LP |
43 | #include "path-util.h" |
44 | #include "random-util.h" | |
33d52ab9 | 45 | #include "stdio-util.h" |
07630cea | 46 | #include "string-util.h" |
a5c32cff | 47 | #include "strv.h" |
93cc7779 | 48 | #include "time-util.h" |
affb60b1 | 49 | #include "umask-util.h" |
335c46b5 | 50 | #include "utf8.h" |
a5c32cff | 51 | |
c2d11a63 VC |
52 | #define READ_FULL_BYTES_MAX (4U*1024U*1024U) |
53 | ||
40beecdb | 54 | int write_string_stream(FILE *f, const char *line, bool enforce_newline) { |
dacd6cee | 55 | |
717603e3 LP |
56 | assert(f); |
57 | assert(line); | |
58 | ||
fec6fc6b | 59 | fputs(line, f); |
40beecdb | 60 | if (enforce_newline && !endswith(line, "\n")) |
a5c32cff HH |
61 | fputc('\n', f); |
62 | ||
dacd6cee | 63 | return fflush_and_check(f); |
a5c32cff HH |
64 | } |
65 | ||
4c1fc3e4 | 66 | static int write_string_file_atomic(const char *fn, const char *line, bool enforce_newline) { |
a5c32cff HH |
67 | _cleanup_fclose_ FILE *f = NULL; |
68 | _cleanup_free_ char *p = NULL; | |
69 | int r; | |
70 | ||
71 | assert(fn); | |
72 | assert(line); | |
73 | ||
74 | r = fopen_temporary(fn, &f, &p); | |
75 | if (r < 0) | |
76 | return r; | |
77 | ||
0d39fa9c | 78 | (void) fchmod_umask(fileno(f), 0644); |
a5c32cff | 79 | |
4c1fc3e4 | 80 | r = write_string_stream(f, line, enforce_newline); |
f2997962 | 81 | if (r >= 0) { |
a5c32cff HH |
82 | if (rename(p, fn) < 0) |
83 | r = -errno; | |
a5c32cff HH |
84 | } |
85 | ||
a5c32cff | 86 | if (r < 0) |
0d39fa9c | 87 | (void) unlink(p); |
a5c32cff HH |
88 | |
89 | return r; | |
90 | } | |
91 | ||
4c1fc3e4 DM |
92 | int write_string_file(const char *fn, const char *line, WriteStringFileFlags flags) { |
93 | _cleanup_fclose_ FILE *f = NULL; | |
eb3da901 | 94 | int q, r; |
4c1fc3e4 DM |
95 | |
96 | assert(fn); | |
97 | assert(line); | |
98 | ||
99 | if (flags & WRITE_STRING_FILE_ATOMIC) { | |
100 | assert(flags & WRITE_STRING_FILE_CREATE); | |
101 | ||
eb3da901 LP |
102 | r = write_string_file_atomic(fn, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE)); |
103 | if (r < 0) | |
104 | goto fail; | |
105 | ||
106 | return r; | |
4c1fc3e4 DM |
107 | } |
108 | ||
109 | if (flags & WRITE_STRING_FILE_CREATE) { | |
110 | f = fopen(fn, "we"); | |
eb3da901 LP |
111 | if (!f) { |
112 | r = -errno; | |
113 | goto fail; | |
114 | } | |
4c1fc3e4 DM |
115 | } else { |
116 | int fd; | |
117 | ||
118 | /* We manually build our own version of fopen(..., "we") that | |
119 | * works without O_CREAT */ | |
120 | fd = open(fn, O_WRONLY|O_CLOEXEC|O_NOCTTY); | |
eb3da901 LP |
121 | if (fd < 0) { |
122 | r = -errno; | |
123 | goto fail; | |
124 | } | |
4c1fc3e4 DM |
125 | |
126 | f = fdopen(fd, "we"); | |
127 | if (!f) { | |
eb3da901 | 128 | r = -errno; |
4c1fc3e4 | 129 | safe_close(fd); |
eb3da901 | 130 | goto fail; |
4c1fc3e4 DM |
131 | } |
132 | } | |
133 | ||
eb3da901 LP |
134 | r = write_string_stream(f, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE)); |
135 | if (r < 0) | |
136 | goto fail; | |
137 | ||
138 | return 0; | |
139 | ||
140 | fail: | |
141 | if (!(flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE)) | |
142 | return r; | |
143 | ||
144 | f = safe_fclose(f); | |
145 | ||
146 | /* OK, the operation failed, but let's see if the right | |
147 | * contents in place already. If so, eat up the error. */ | |
148 | ||
149 | q = verify_file(fn, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE)); | |
150 | if (q <= 0) | |
151 | return r; | |
152 | ||
153 | return 0; | |
4c1fc3e4 DM |
154 | } |
155 | ||
a5c32cff HH |
156 | int read_one_line_file(const char *fn, char **line) { |
157 | _cleanup_fclose_ FILE *f = NULL; | |
158 | char t[LINE_MAX], *c; | |
159 | ||
160 | assert(fn); | |
161 | assert(line); | |
162 | ||
163 | f = fopen(fn, "re"); | |
164 | if (!f) | |
165 | return -errno; | |
166 | ||
167 | if (!fgets(t, sizeof(t), f)) { | |
168 | ||
169 | if (ferror(f)) | |
f5e5c28f | 170 | return errno > 0 ? -errno : -EIO; |
a5c32cff HH |
171 | |
172 | t[0] = 0; | |
173 | } | |
174 | ||
175 | c = strdup(t); | |
176 | if (!c) | |
177 | return -ENOMEM; | |
178 | truncate_nl(c); | |
179 | ||
180 | *line = c; | |
181 | return 0; | |
182 | } | |
183 | ||
eb3da901 LP |
184 | int verify_file(const char *fn, const char *blob, bool accept_extra_nl) { |
185 | _cleanup_fclose_ FILE *f = NULL; | |
186 | _cleanup_free_ char *buf = NULL; | |
187 | size_t l, k; | |
15dee3f0 | 188 | |
eb3da901 LP |
189 | assert(fn); |
190 | assert(blob); | |
191 | ||
192 | l = strlen(blob); | |
193 | ||
194 | if (accept_extra_nl && endswith(blob, "\n")) | |
195 | accept_extra_nl = false; | |
196 | ||
197 | buf = malloc(l + accept_extra_nl + 1); | |
198 | if (!buf) | |
199 | return -ENOMEM; | |
200 | ||
201 | f = fopen(fn, "re"); | |
202 | if (!f) | |
203 | return -errno; | |
204 | ||
205 | /* We try to read one byte more than we need, so that we know whether we hit eof */ | |
206 | errno = 0; | |
207 | k = fread(buf, 1, l + accept_extra_nl + 1, f); | |
208 | if (ferror(f)) | |
209 | return errno > 0 ? -errno : -EIO; | |
210 | ||
211 | if (k != l && k != l + accept_extra_nl) | |
212 | return 0; | |
213 | if (memcmp(buf, blob, l) != 0) | |
214 | return 0; | |
215 | if (k > l && buf[l] != '\n') | |
216 | return 0; | |
15dee3f0 | 217 | |
eb3da901 | 218 | return 1; |
15dee3f0 LP |
219 | } |
220 | ||
717603e3 | 221 | int read_full_stream(FILE *f, char **contents, size_t *size) { |
a5c32cff HH |
222 | size_t n, l; |
223 | _cleanup_free_ char *buf = NULL; | |
224 | struct stat st; | |
225 | ||
717603e3 | 226 | assert(f); |
a5c32cff HH |
227 | assert(contents); |
228 | ||
a5c32cff HH |
229 | if (fstat(fileno(f), &st) < 0) |
230 | return -errno; | |
231 | ||
717603e3 | 232 | n = LINE_MAX; |
a5c32cff | 233 | |
717603e3 LP |
234 | if (S_ISREG(st.st_mode)) { |
235 | ||
236 | /* Safety check */ | |
c2d11a63 | 237 | if (st.st_size > READ_FULL_BYTES_MAX) |
717603e3 LP |
238 | return -E2BIG; |
239 | ||
240 | /* Start with the right file size, but be prepared for | |
241 | * files from /proc which generally report a file size | |
242 | * of 0 */ | |
243 | if (st.st_size > 0) | |
244 | n = st.st_size; | |
245 | } | |
a5c32cff | 246 | |
717603e3 | 247 | l = 0; |
a5c32cff HH |
248 | for (;;) { |
249 | char *t; | |
250 | size_t k; | |
251 | ||
c2d11a63 | 252 | t = realloc(buf, n + 1); |
a5c32cff HH |
253 | if (!t) |
254 | return -ENOMEM; | |
255 | ||
256 | buf = t; | |
257 | k = fread(buf + l, 1, n - l, f); | |
c2d11a63 VC |
258 | if (k > 0) |
259 | l += k; | |
a5c32cff | 260 | |
c2d11a63 VC |
261 | if (ferror(f)) |
262 | return -errno; | |
a5c32cff | 263 | |
c2d11a63 | 264 | if (feof(f)) |
a5c32cff | 265 | break; |
a5c32cff | 266 | |
c2d11a63 VC |
267 | /* We aren't expecting fread() to return a short read outside |
268 | * of (error && eof), assert buffer is full and enlarge buffer. | |
269 | */ | |
270 | assert(l == n); | |
a5c32cff HH |
271 | |
272 | /* Safety check */ | |
c2d11a63 | 273 | if (n >= READ_FULL_BYTES_MAX) |
a5c32cff | 274 | return -E2BIG; |
c2d11a63 | 275 | |
82b103a7 | 276 | n = MIN(n * 2, READ_FULL_BYTES_MAX); |
a5c32cff HH |
277 | } |
278 | ||
279 | buf[l] = 0; | |
280 | *contents = buf; | |
d78a28e3 | 281 | buf = NULL; /* do not free */ |
a5c32cff HH |
282 | |
283 | if (size) | |
284 | *size = l; | |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
717603e3 LP |
289 | int read_full_file(const char *fn, char **contents, size_t *size) { |
290 | _cleanup_fclose_ FILE *f = NULL; | |
291 | ||
292 | assert(fn); | |
293 | assert(contents); | |
294 | ||
295 | f = fopen(fn, "re"); | |
296 | if (!f) | |
297 | return -errno; | |
298 | ||
299 | return read_full_stream(f, contents, size); | |
300 | } | |
301 | ||
f73141d7 | 302 | static int parse_env_file_internal( |
717603e3 | 303 | FILE *f, |
a5c32cff | 304 | const char *fname, |
f73141d7 | 305 | const char *newline, |
335c46b5 | 306 | int (*push) (const char *filename, unsigned line, |
a5f6c30d MS |
307 | const char *key, char *value, void *userdata, int *n_pushed), |
308 | void *userdata, | |
309 | int *n_pushed) { | |
f73141d7 LP |
310 | |
311 | _cleanup_free_ char *contents = NULL, *key = NULL; | |
2b77f67e | 312 | 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 |
313 | char *p, *value = NULL; |
314 | int r; | |
335c46b5 | 315 | unsigned line = 1; |
a5c32cff | 316 | |
f73141d7 LP |
317 | enum { |
318 | PRE_KEY, | |
319 | KEY, | |
f73141d7 LP |
320 | PRE_VALUE, |
321 | VALUE, | |
322 | VALUE_ESCAPE, | |
323 | SINGLE_QUOTE_VALUE, | |
324 | SINGLE_QUOTE_VALUE_ESCAPE, | |
325 | DOUBLE_QUOTE_VALUE, | |
326 | DOUBLE_QUOTE_VALUE_ESCAPE, | |
327 | COMMENT, | |
328 | COMMENT_ESCAPE | |
329 | } state = PRE_KEY; | |
a5c32cff | 330 | |
f73141d7 | 331 | assert(newline); |
a5c32cff | 332 | |
717603e3 LP |
333 | if (f) |
334 | r = read_full_stream(f, &contents, NULL); | |
335 | else | |
336 | r = read_full_file(fname, &contents, NULL); | |
1c17cbed | 337 | if (r < 0) |
a5c32cff HH |
338 | return r; |
339 | ||
f73141d7 LP |
340 | for (p = contents; *p; p++) { |
341 | char c = *p; | |
342 | ||
343 | switch (state) { | |
344 | ||
345 | case PRE_KEY: | |
ebc05a09 | 346 | if (strchr(COMMENTS, c)) |
f73141d7 LP |
347 | state = COMMENT; |
348 | else if (!strchr(WHITESPACE, c)) { | |
349 | state = KEY; | |
2b77f67e LP |
350 | last_key_whitespace = (size_t) -1; |
351 | ||
ca2d3784 | 352 | if (!GREEDY_REALLOC(key, key_alloc, n_key+2)) { |
f73141d7 LP |
353 | r = -ENOMEM; |
354 | goto fail; | |
355 | } | |
356 | ||
357 | key[n_key++] = c; | |
358 | } | |
359 | break; | |
360 | ||
361 | case KEY: | |
362 | if (strchr(newline, c)) { | |
363 | state = PRE_KEY; | |
313cefa1 | 364 | line++; |
f73141d7 | 365 | n_key = 0; |
2b77f67e | 366 | } else if (c == '=') { |
f73141d7 | 367 | state = PRE_VALUE; |
2b77f67e LP |
368 | last_value_whitespace = (size_t) -1; |
369 | } else { | |
370 | if (!strchr(WHITESPACE, c)) | |
371 | last_key_whitespace = (size_t) -1; | |
372 | else if (last_key_whitespace == (size_t) -1) | |
373 | last_key_whitespace = n_key; | |
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 | } | |
a5c32cff | 382 | |
f73141d7 LP |
383 | break; |
384 | ||
f73141d7 | 385 | case PRE_VALUE: |
98f59e59 | 386 | if (strchr(newline, c)) { |
f73141d7 | 387 | state = PRE_KEY; |
313cefa1 | 388 | line++; |
f73141d7 | 389 | key[n_key] = 0; |
a5c32cff | 390 | |
f73141d7 LP |
391 | if (value) |
392 | value[n_value] = 0; | |
a5c32cff | 393 | |
ebc05a09 | 394 | /* strip trailing whitespace from key */ |
2b77f67e LP |
395 | if (last_key_whitespace != (size_t) -1) |
396 | key[last_key_whitespace] = 0; | |
ebc05a09 | 397 | |
a5f6c30d | 398 | r = push(fname, line, key, value, userdata, n_pushed); |
f73141d7 LP |
399 | if (r < 0) |
400 | goto fail; | |
401 | ||
402 | n_key = 0; | |
403 | value = NULL; | |
404 | value_alloc = n_value = 0; | |
2b77f67e | 405 | |
f73141d7 LP |
406 | } else if (c == '\'') |
407 | state = SINGLE_QUOTE_VALUE; | |
408 | else if (c == '\"') | |
409 | state = DOUBLE_QUOTE_VALUE; | |
410 | else if (c == '\\') | |
411 | state = VALUE_ESCAPE; | |
412 | else if (!strchr(WHITESPACE, c)) { | |
413 | state = VALUE; | |
414 | ||
ca2d3784 | 415 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
416 | r = -ENOMEM; |
417 | goto fail; | |
418 | } | |
419 | ||
420 | value[n_value++] = c; | |
421 | } | |
422 | ||
423 | break; | |
424 | ||
425 | case VALUE: | |
426 | if (strchr(newline, c)) { | |
427 | state = PRE_KEY; | |
313cefa1 | 428 | line++; |
98f59e59 | 429 | |
f73141d7 LP |
430 | key[n_key] = 0; |
431 | ||
432 | if (value) | |
433 | value[n_value] = 0; | |
434 | ||
2b77f67e LP |
435 | /* Chomp off trailing whitespace from value */ |
436 | if (last_value_whitespace != (size_t) -1) | |
437 | value[last_value_whitespace] = 0; | |
f73141d7 | 438 | |
ebc05a09 | 439 | /* strip trailing whitespace from key */ |
2b77f67e LP |
440 | if (last_key_whitespace != (size_t) -1) |
441 | key[last_key_whitespace] = 0; | |
ebc05a09 | 442 | |
a5f6c30d | 443 | r = push(fname, line, key, value, userdata, n_pushed); |
f73141d7 LP |
444 | if (r < 0) |
445 | goto fail; | |
446 | ||
447 | n_key = 0; | |
448 | value = NULL; | |
449 | value_alloc = n_value = 0; | |
2b77f67e | 450 | |
f73141d7 LP |
451 | } else if (c == '\\') { |
452 | state = VALUE_ESCAPE; | |
2b77f67e | 453 | last_value_whitespace = (size_t) -1; |
f73141d7 LP |
454 | } else { |
455 | if (!strchr(WHITESPACE, c)) | |
2b77f67e LP |
456 | last_value_whitespace = (size_t) -1; |
457 | else if (last_value_whitespace == (size_t) -1) | |
458 | last_value_whitespace = n_value; | |
f73141d7 | 459 | |
ca2d3784 | 460 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
461 | r = -ENOMEM; |
462 | goto fail; | |
463 | } | |
464 | ||
465 | value[n_value++] = c; | |
466 | } | |
467 | ||
468 | break; | |
469 | ||
470 | case VALUE_ESCAPE: | |
471 | state = VALUE; | |
472 | ||
473 | if (!strchr(newline, c)) { | |
474 | /* Escaped newlines we eat up entirely */ | |
ca2d3784 | 475 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
476 | r = -ENOMEM; |
477 | goto fail; | |
478 | } | |
479 | ||
480 | value[n_value++] = c; | |
481 | } | |
482 | break; | |
483 | ||
484 | case SINGLE_QUOTE_VALUE: | |
485 | if (c == '\'') | |
486 | state = PRE_VALUE; | |
487 | else if (c == '\\') | |
488 | state = SINGLE_QUOTE_VALUE_ESCAPE; | |
489 | else { | |
ca2d3784 | 490 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
491 | r = -ENOMEM; |
492 | goto fail; | |
493 | } | |
a5c32cff | 494 | |
f73141d7 LP |
495 | value[n_value++] = c; |
496 | } | |
a5c32cff | 497 | |
f73141d7 | 498 | break; |
a5c32cff | 499 | |
f73141d7 LP |
500 | case SINGLE_QUOTE_VALUE_ESCAPE: |
501 | state = SINGLE_QUOTE_VALUE; | |
a5c32cff | 502 | |
f73141d7 | 503 | if (!strchr(newline, c)) { |
ca2d3784 | 504 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
a5c32cff | 505 | r = -ENOMEM; |
a5c32cff HH |
506 | goto fail; |
507 | } | |
508 | ||
f73141d7 LP |
509 | value[n_value++] = c; |
510 | } | |
511 | break; | |
512 | ||
513 | case DOUBLE_QUOTE_VALUE: | |
514 | if (c == '\"') | |
515 | state = PRE_VALUE; | |
516 | else if (c == '\\') | |
517 | state = DOUBLE_QUOTE_VALUE_ESCAPE; | |
518 | else { | |
ca2d3784 | 519 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
520 | r = -ENOMEM; |
521 | goto fail; | |
a5c32cff HH |
522 | } |
523 | ||
f73141d7 LP |
524 | value[n_value++] = c; |
525 | } | |
526 | ||
527 | break; | |
528 | ||
529 | case DOUBLE_QUOTE_VALUE_ESCAPE: | |
530 | state = DOUBLE_QUOTE_VALUE; | |
a5c32cff | 531 | |
f73141d7 | 532 | if (!strchr(newline, c)) { |
ca2d3784 | 533 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
534 | r = -ENOMEM; |
535 | goto fail; | |
536 | } | |
a5c32cff | 537 | |
f73141d7 | 538 | value[n_value++] = c; |
a5c32cff | 539 | } |
f73141d7 LP |
540 | break; |
541 | ||
542 | case COMMENT: | |
543 | if (c == '\\') | |
544 | state = COMMENT_ESCAPE; | |
335c46b5 | 545 | else if (strchr(newline, c)) { |
f73141d7 | 546 | state = PRE_KEY; |
313cefa1 | 547 | line++; |
335c46b5 | 548 | } |
f73141d7 LP |
549 | break; |
550 | ||
551 | case COMMENT_ESCAPE: | |
552 | state = COMMENT; | |
553 | break; | |
a5c32cff | 554 | } |
f73141d7 LP |
555 | } |
556 | ||
371328dc ZJS |
557 | if (IN_SET(state, |
558 | PRE_VALUE, | |
559 | VALUE, | |
560 | VALUE_ESCAPE, | |
561 | SINGLE_QUOTE_VALUE, | |
562 | SINGLE_QUOTE_VALUE_ESCAPE, | |
563 | DOUBLE_QUOTE_VALUE, | |
564 | DOUBLE_QUOTE_VALUE_ESCAPE)) { | |
a5c32cff | 565 | |
f73141d7 LP |
566 | key[n_key] = 0; |
567 | ||
568 | if (value) | |
569 | value[n_value] = 0; | |
570 | ||
2b77f67e LP |
571 | if (state == VALUE) |
572 | if (last_value_whitespace != (size_t) -1) | |
573 | value[last_value_whitespace] = 0; | |
574 | ||
ebc05a09 | 575 | /* strip trailing whitespace from key */ |
2b77f67e LP |
576 | if (last_key_whitespace != (size_t) -1) |
577 | key[last_key_whitespace] = 0; | |
ebc05a09 | 578 | |
a5f6c30d | 579 | r = push(fname, line, key, value, userdata, n_pushed); |
f73141d7 LP |
580 | if (r < 0) |
581 | goto fail; | |
a5c32cff HH |
582 | } |
583 | ||
f73141d7 LP |
584 | return 0; |
585 | ||
a5c32cff | 586 | fail: |
f73141d7 | 587 | free(value); |
a5c32cff HH |
588 | return r; |
589 | } | |
590 | ||
ac466818 | 591 | static int check_utf8ness_and_warn( |
717603e3 | 592 | const char *filename, unsigned line, |
ac466818 | 593 | const char *key, char *value) { |
f27f0e21 GB |
594 | |
595 | if (!utf8_is_valid(key)) { | |
3587161a | 596 | _cleanup_free_ char *p = NULL; |
550a40ec | 597 | |
717603e3 LP |
598 | p = utf8_escape_invalid(key); |
599 | log_error("%s:%u: invalid UTF-8 in key '%s', ignoring.", strna(filename), line, p); | |
f27f0e21 GB |
600 | return -EINVAL; |
601 | } | |
602 | ||
603 | if (value && !utf8_is_valid(value)) { | |
3587161a | 604 | _cleanup_free_ char *p = NULL; |
550a40ec | 605 | |
717603e3 LP |
606 | p = utf8_escape_invalid(value); |
607 | log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, p); | |
f27f0e21 GB |
608 | return -EINVAL; |
609 | } | |
a5c32cff | 610 | |
ac466818 ZJS |
611 | return 0; |
612 | } | |
613 | ||
614 | static int parse_env_file_push( | |
615 | const char *filename, unsigned line, | |
616 | const char *key, char *value, | |
617 | void *userdata, | |
618 | int *n_pushed) { | |
619 | ||
620 | const char *k; | |
621 | va_list aq, *ap = userdata; | |
622 | int r; | |
623 | ||
624 | r = check_utf8ness_and_warn(filename, line, key, value); | |
625 | if (r < 0) | |
626 | return r; | |
627 | ||
f27f0e21 | 628 | va_copy(aq, *ap); |
a5c32cff | 629 | |
f27f0e21 GB |
630 | while ((k = va_arg(aq, const char *))) { |
631 | char **v; | |
a5c32cff | 632 | |
f27f0e21 | 633 | v = va_arg(aq, char **); |
a5c32cff | 634 | |
f27f0e21 GB |
635 | if (streq(key, k)) { |
636 | va_end(aq); | |
637 | free(*v); | |
638 | *v = value; | |
a5f6c30d MS |
639 | |
640 | if (n_pushed) | |
641 | (*n_pushed)++; | |
642 | ||
f27f0e21 | 643 | return 1; |
f73141d7 | 644 | } |
335c46b5 | 645 | } |
a5c32cff | 646 | |
f27f0e21 | 647 | va_end(aq); |
f73141d7 | 648 | free(value); |
717603e3 | 649 | |
f73141d7 LP |
650 | return 0; |
651 | } | |
a5c32cff | 652 | |
f73141d7 LP |
653 | int parse_env_file( |
654 | const char *fname, | |
655 | const char *newline, ...) { | |
a5c32cff | 656 | |
f73141d7 | 657 | va_list ap; |
a5f6c30d | 658 | int r, n_pushed = 0; |
a5c32cff | 659 | |
f73141d7 LP |
660 | if (!newline) |
661 | newline = NEWLINE; | |
a5c32cff | 662 | |
f73141d7 | 663 | va_start(ap, newline); |
a5f6c30d | 664 | r = parse_env_file_internal(NULL, fname, newline, parse_env_file_push, &ap, &n_pushed); |
f73141d7 | 665 | va_end(ap); |
a5c32cff | 666 | |
a5f6c30d | 667 | return r < 0 ? r : n_pushed; |
f73141d7 | 668 | } |
a5c32cff | 669 | |
717603e3 LP |
670 | static int load_env_file_push( |
671 | const char *filename, unsigned line, | |
672 | const char *key, char *value, | |
a5f6c30d MS |
673 | void *userdata, |
674 | int *n_pushed) { | |
f27f0e21 GB |
675 | char ***m = userdata; |
676 | char *p; | |
677 | int r; | |
a5c32cff | 678 | |
ac466818 ZJS |
679 | r = check_utf8ness_and_warn(filename, line, key, value); |
680 | if (r < 0) | |
681 | return r; | |
a5c32cff | 682 | |
99003e01 | 683 | p = strjoin(key, "=", value); |
f27f0e21 GB |
684 | if (!p) |
685 | return -ENOMEM; | |
335c46b5 | 686 | |
99003e01 ZJS |
687 | r = strv_env_replace(m, p); |
688 | if (r < 0) { | |
689 | free(p); | |
f27f0e21 | 690 | return r; |
99003e01 | 691 | } |
a5c32cff | 692 | |
a5f6c30d MS |
693 | if (n_pushed) |
694 | (*n_pushed)++; | |
695 | ||
f73141d7 LP |
696 | free(value); |
697 | return 0; | |
698 | } | |
699 | ||
717603e3 LP |
700 | int load_env_file(FILE *f, const char *fname, const char *newline, char ***rl) { |
701 | char **m = NULL; | |
702 | int r; | |
703 | ||
704 | if (!newline) | |
705 | newline = NEWLINE; | |
706 | ||
a5f6c30d | 707 | r = parse_env_file_internal(f, fname, newline, load_env_file_push, &m, NULL); |
717603e3 LP |
708 | if (r < 0) { |
709 | strv_free(m); | |
710 | return r; | |
711 | } | |
712 | ||
713 | *rl = m; | |
714 | return 0; | |
715 | } | |
716 | ||
717 | static int load_env_file_push_pairs( | |
718 | const char *filename, unsigned line, | |
719 | const char *key, char *value, | |
a5f6c30d MS |
720 | void *userdata, |
721 | int *n_pushed) { | |
717603e3 LP |
722 | char ***m = userdata; |
723 | int r; | |
724 | ||
ac466818 ZJS |
725 | r = check_utf8ness_and_warn(filename, line, key, value); |
726 | if (r < 0) | |
727 | return r; | |
717603e3 LP |
728 | |
729 | r = strv_extend(m, key); | |
730 | if (r < 0) | |
731 | return -ENOMEM; | |
732 | ||
733 | if (!value) { | |
734 | r = strv_extend(m, ""); | |
735 | if (r < 0) | |
736 | return -ENOMEM; | |
737 | } else { | |
738 | r = strv_push(m, value); | |
739 | if (r < 0) | |
740 | return r; | |
741 | } | |
742 | ||
a5f6c30d MS |
743 | if (n_pushed) |
744 | (*n_pushed)++; | |
745 | ||
717603e3 LP |
746 | return 0; |
747 | } | |
748 | ||
749 | int load_env_file_pairs(FILE *f, const char *fname, const char *newline, char ***rl) { | |
f73141d7 LP |
750 | char **m = NULL; |
751 | int r; | |
a5c32cff | 752 | |
f73141d7 LP |
753 | if (!newline) |
754 | newline = NEWLINE; | |
755 | ||
a5f6c30d | 756 | r = parse_env_file_internal(f, fname, newline, load_env_file_push_pairs, &m, NULL); |
f73141d7 LP |
757 | if (r < 0) { |
758 | strv_free(m); | |
759 | return r; | |
a5c32cff HH |
760 | } |
761 | ||
762 | *rl = m; | |
a5c32cff HH |
763 | return 0; |
764 | } | |
765 | ||
37f3ffca RS |
766 | static int merge_env_file_push( |
767 | const char *filename, unsigned line, | |
768 | const char *key, char *value, | |
769 | void *userdata, | |
770 | int *n_pushed) { | |
771 | ||
772 | char ***env = userdata; | |
773 | char *expanded_value; | |
774 | ||
775 | assert(env); | |
776 | ||
184d1904 ZJS |
777 | if (!value) { |
778 | log_error("%s:%u: invalid syntax (around \"%s\"), ignoring.", strna(filename), line, key); | |
779 | return 0; | |
780 | } | |
781 | ||
782 | if (!env_name_is_valid(key)) { | |
783 | log_error("%s:%u: invalid variable name \"%s\", ignoring.", strna(filename), line, key); | |
2ea8081a | 784 | free(value); |
184d1904 ZJS |
785 | return 0; |
786 | } | |
787 | ||
ccad1fd0 | 788 | expanded_value = replace_env(value, *env, |
b82f58bf RS |
789 | REPLACE_ENV_USE_ENVIRONMENT| |
790 | REPLACE_ENV_ALLOW_BRACELESS| | |
791 | REPLACE_ENV_ALLOW_EXTENDED); | |
37f3ffca RS |
792 | if (!expanded_value) |
793 | return -ENOMEM; | |
794 | ||
795 | free_and_replace(value, expanded_value); | |
796 | ||
797 | return load_env_file_push(filename, line, key, value, env, n_pushed); | |
798 | } | |
799 | ||
800 | int merge_env_file( | |
801 | char ***env, | |
802 | FILE *f, | |
803 | const char *fname) { | |
804 | ||
ccad1fd0 | 805 | /* NOTE: this function supports braceful and braceless variable expansions, |
b82f58bf | 806 | * plus "extended" substitutions, unlike other exported parsing functions. |
ccad1fd0 ZJS |
807 | */ |
808 | ||
37f3ffca RS |
809 | return parse_env_file_internal(f, fname, NEWLINE, merge_env_file_push, env, NULL); |
810 | } | |
811 | ||
768100ef LP |
812 | static void write_env_var(FILE *f, const char *v) { |
813 | const char *p; | |
814 | ||
815 | p = strchr(v, '='); | |
816 | if (!p) { | |
817 | /* Fallback */ | |
818 | fputs(v, f); | |
819 | fputc('\n', f); | |
820 | return; | |
821 | } | |
822 | ||
823 | p++; | |
824 | fwrite(v, 1, p-v, f); | |
825 | ||
0ce5a806 | 826 | if (string_has_cc(p, NULL) || chars_intersect(p, WHITESPACE SHELL_NEED_QUOTES)) { |
768100ef LP |
827 | fputc('\"', f); |
828 | ||
829 | for (; *p; p++) { | |
0ce5a806 | 830 | if (strchr(SHELL_NEED_ESCAPE, *p)) |
768100ef LP |
831 | fputc('\\', f); |
832 | ||
833 | fputc(*p, f); | |
834 | } | |
835 | ||
836 | fputc('\"', f); | |
837 | } else | |
838 | fputs(p, f); | |
839 | ||
840 | fputc('\n', f); | |
841 | } | |
842 | ||
a5c32cff | 843 | int write_env_file(const char *fname, char **l) { |
7fd1b19b | 844 | _cleanup_fclose_ FILE *f = NULL; |
736937e5 LP |
845 | _cleanup_free_ char *p = NULL; |
846 | char **i; | |
a5c32cff HH |
847 | int r; |
848 | ||
736937e5 LP |
849 | assert(fname); |
850 | ||
a5c32cff HH |
851 | r = fopen_temporary(fname, &f, &p); |
852 | if (r < 0) | |
853 | return r; | |
854 | ||
855 | fchmod_umask(fileno(f), 0644); | |
856 | ||
768100ef LP |
857 | STRV_FOREACH(i, l) |
858 | write_env_var(f, *i); | |
a5c32cff | 859 | |
736937e5 LP |
860 | r = fflush_and_check(f); |
861 | if (r >= 0) { | |
862 | if (rename(p, fname) >= 0) | |
863 | return 0; | |
a5c32cff | 864 | |
736937e5 | 865 | r = -errno; |
a5c32cff HH |
866 | } |
867 | ||
736937e5 | 868 | unlink(p); |
a5c32cff HH |
869 | return r; |
870 | } | |
68fee104 ZJS |
871 | |
872 | int executable_is_script(const char *path, char **interpreter) { | |
873 | int r; | |
c8b32e11 | 874 | _cleanup_free_ char *line = NULL; |
68fee104 ZJS |
875 | int len; |
876 | char *ans; | |
877 | ||
878 | assert(path); | |
879 | ||
880 | r = read_one_line_file(path, &line); | |
881 | if (r < 0) | |
882 | return r; | |
883 | ||
884 | if (!startswith(line, "#!")) | |
885 | return 0; | |
886 | ||
887 | ans = strstrip(line + 2); | |
888 | len = strcspn(ans, " \t"); | |
889 | ||
890 | if (len == 0) | |
891 | return 0; | |
892 | ||
893 | ans = strndup(ans, len); | |
894 | if (!ans) | |
895 | return -ENOMEM; | |
896 | ||
897 | *interpreter = ans; | |
898 | return 1; | |
899 | } | |
69ab8088 ZJS |
900 | |
901 | /** | |
0a7b53bd | 902 | * Retrieve one field from a file like /proc/self/status. pattern |
c4cd1d4d AK |
903 | * should not include whitespace or the delimiter (':'). pattern matches only |
904 | * the beginning of a line. Whitespace before ':' is skipped. Whitespace and | |
905 | * zeros after the ':' will be skipped. field must be freed afterwards. | |
906 | * terminator specifies the terminating characters of the field value (not | |
907 | * included in the value). | |
69ab8088 | 908 | */ |
c4cd1d4d | 909 | int get_proc_field(const char *filename, const char *pattern, const char *terminator, char **field) { |
69ab8088 | 910 | _cleanup_free_ char *status = NULL; |
90110825 | 911 | char *t, *f; |
69ab8088 ZJS |
912 | size_t len; |
913 | int r; | |
914 | ||
c4cd1d4d | 915 | assert(terminator); |
69ab8088 | 916 | assert(filename); |
7ff7394d | 917 | assert(pattern); |
69ab8088 ZJS |
918 | assert(field); |
919 | ||
920 | r = read_full_file(filename, &status, NULL); | |
921 | if (r < 0) | |
922 | return r; | |
923 | ||
c4cd1d4d AK |
924 | t = status; |
925 | ||
926 | do { | |
927 | bool pattern_ok; | |
928 | ||
929 | do { | |
930 | t = strstr(t, pattern); | |
931 | if (!t) | |
932 | return -ENOENT; | |
933 | ||
934 | /* Check that pattern occurs in beginning of line. */ | |
935 | pattern_ok = (t == status || t[-1] == '\n'); | |
936 | ||
937 | t += strlen(pattern); | |
938 | ||
939 | } while (!pattern_ok); | |
940 | ||
941 | t += strspn(t, " \t"); | |
942 | if (!*t) | |
943 | return -ENOENT; | |
944 | ||
945 | } while (*t != ':'); | |
946 | ||
947 | t++; | |
69ab8088 | 948 | |
4ec29144 | 949 | if (*t) { |
1e5413f7 ZJS |
950 | t += strspn(t, " \t"); |
951 | ||
952 | /* Also skip zeros, because when this is used for | |
953 | * capabilities, we don't want the zeros. This way the | |
954 | * same capability set always maps to the same string, | |
955 | * irrespective of the total capability set size. For | |
956 | * other numbers it shouldn't matter. */ | |
957 | t += strspn(t, "0"); | |
4ec29144 ZJS |
958 | /* Back off one char if there's nothing but whitespace |
959 | and zeros */ | |
1e5413f7 | 960 | if (!*t || isspace(*t)) |
313cefa1 | 961 | t--; |
4ec29144 | 962 | } |
69ab8088 | 963 | |
c4cd1d4d | 964 | len = strcspn(t, terminator); |
69ab8088 | 965 | |
90110825 LP |
966 | f = strndup(t, len); |
967 | if (!f) | |
69ab8088 ZJS |
968 | return -ENOMEM; |
969 | ||
90110825 | 970 | *field = f; |
69ab8088 ZJS |
971 | return 0; |
972 | } | |
0d39fa9c LP |
973 | |
974 | DIR *xopendirat(int fd, const char *name, int flags) { | |
975 | int nfd; | |
976 | DIR *d; | |
977 | ||
978 | assert(!(flags & O_CREAT)); | |
979 | ||
980 | nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags, 0); | |
981 | if (nfd < 0) | |
982 | return NULL; | |
983 | ||
984 | d = fdopendir(nfd); | |
985 | if (!d) { | |
986 | safe_close(nfd); | |
987 | return NULL; | |
988 | } | |
989 | ||
990 | return d; | |
991 | } | |
992 | ||
993 | static int search_and_fopen_internal(const char *path, const char *mode, const char *root, char **search, FILE **_f) { | |
994 | char **i; | |
995 | ||
996 | assert(path); | |
997 | assert(mode); | |
998 | assert(_f); | |
999 | ||
1000 | if (!path_strv_resolve_uniq(search, root)) | |
1001 | return -ENOMEM; | |
1002 | ||
1003 | STRV_FOREACH(i, search) { | |
1004 | _cleanup_free_ char *p = NULL; | |
1005 | FILE *f; | |
1006 | ||
1007 | if (root) | |
605405c6 | 1008 | p = strjoin(root, *i, "/", path); |
0d39fa9c | 1009 | else |
605405c6 | 1010 | p = strjoin(*i, "/", path); |
0d39fa9c LP |
1011 | if (!p) |
1012 | return -ENOMEM; | |
1013 | ||
1014 | f = fopen(p, mode); | |
1015 | if (f) { | |
1016 | *_f = f; | |
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | if (errno != ENOENT) | |
1021 | return -errno; | |
1022 | } | |
1023 | ||
1024 | return -ENOENT; | |
1025 | } | |
1026 | ||
1027 | int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f) { | |
1028 | _cleanup_strv_free_ char **copy = NULL; | |
1029 | ||
1030 | assert(path); | |
1031 | assert(mode); | |
1032 | assert(_f); | |
1033 | ||
1034 | if (path_is_absolute(path)) { | |
1035 | FILE *f; | |
1036 | ||
1037 | f = fopen(path, mode); | |
1038 | if (f) { | |
1039 | *_f = f; | |
1040 | return 0; | |
1041 | } | |
1042 | ||
1043 | return -errno; | |
1044 | } | |
1045 | ||
1046 | copy = strv_copy((char**) search); | |
1047 | if (!copy) | |
1048 | return -ENOMEM; | |
1049 | ||
1050 | return search_and_fopen_internal(path, mode, root, copy, _f); | |
1051 | } | |
1052 | ||
1053 | int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f) { | |
1054 | _cleanup_strv_free_ char **s = NULL; | |
1055 | ||
1056 | if (path_is_absolute(path)) { | |
1057 | FILE *f; | |
1058 | ||
1059 | f = fopen(path, mode); | |
1060 | if (f) { | |
1061 | *_f = f; | |
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | return -errno; | |
1066 | } | |
1067 | ||
1068 | s = strv_split_nulstr(search); | |
1069 | if (!s) | |
1070 | return -ENOMEM; | |
1071 | ||
1072 | return search_and_fopen_internal(path, mode, root, s, _f); | |
1073 | } | |
1074 | ||
1075 | int fopen_temporary(const char *path, FILE **_f, char **_temp_path) { | |
1076 | FILE *f; | |
1077 | char *t; | |
1078 | int r, fd; | |
1079 | ||
1080 | assert(path); | |
1081 | assert(_f); | |
1082 | assert(_temp_path); | |
1083 | ||
1084 | r = tempfn_xxxxxx(path, NULL, &t); | |
1085 | if (r < 0) | |
1086 | return r; | |
1087 | ||
646853bd | 1088 | fd = mkostemp_safe(t); |
0d39fa9c LP |
1089 | if (fd < 0) { |
1090 | free(t); | |
1091 | return -errno; | |
1092 | } | |
1093 | ||
1094 | f = fdopen(fd, "we"); | |
1095 | if (!f) { | |
1096 | unlink_noerrno(t); | |
1097 | free(t); | |
1098 | safe_close(fd); | |
1099 | return -errno; | |
1100 | } | |
1101 | ||
1102 | *_f = f; | |
1103 | *_temp_path = t; | |
1104 | ||
1105 | return 0; | |
1106 | } | |
1107 | ||
1108 | int fflush_and_check(FILE *f) { | |
1109 | assert(f); | |
1110 | ||
1111 | errno = 0; | |
1112 | fflush(f); | |
1113 | ||
1114 | if (ferror(f)) | |
f5e5c28f | 1115 | return errno > 0 ? -errno : -EIO; |
0d39fa9c LP |
1116 | |
1117 | return 0; | |
1118 | } | |
1119 | ||
61233823 | 1120 | /* This is much like mkostemp() but is subject to umask(). */ |
646853bd | 1121 | int mkostemp_safe(char *pattern) { |
3587161a | 1122 | _cleanup_umask_ mode_t u = 0; |
0d39fa9c LP |
1123 | int fd; |
1124 | ||
1125 | assert(pattern); | |
1126 | ||
1127 | u = umask(077); | |
1128 | ||
646853bd | 1129 | fd = mkostemp(pattern, O_CLOEXEC); |
0d39fa9c LP |
1130 | if (fd < 0) |
1131 | return -errno; | |
1132 | ||
1133 | return fd; | |
1134 | } | |
1135 | ||
0d39fa9c LP |
1136 | int tempfn_xxxxxx(const char *p, const char *extra, char **ret) { |
1137 | const char *fn; | |
1138 | char *t; | |
1139 | ||
1140 | assert(p); | |
1141 | assert(ret); | |
1142 | ||
1143 | /* | |
1144 | * Turns this: | |
1145 | * /foo/bar/waldo | |
1146 | * | |
1147 | * Into this: | |
1148 | * /foo/bar/.#<extra>waldoXXXXXX | |
1149 | */ | |
1150 | ||
1151 | fn = basename(p); | |
1152 | if (!filename_is_valid(fn)) | |
1153 | return -EINVAL; | |
1154 | ||
1155 | if (extra == NULL) | |
1156 | extra = ""; | |
1157 | ||
1158 | t = new(char, strlen(p) + 2 + strlen(extra) + 6 + 1); | |
1159 | if (!t) | |
1160 | return -ENOMEM; | |
1161 | ||
1162 | strcpy(stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn), "XXXXXX"); | |
1163 | ||
1164 | *ret = path_kill_slashes(t); | |
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | int tempfn_random(const char *p, const char *extra, char **ret) { | |
1169 | const char *fn; | |
1170 | char *t, *x; | |
1171 | uint64_t u; | |
1172 | unsigned i; | |
1173 | ||
1174 | assert(p); | |
1175 | assert(ret); | |
1176 | ||
1177 | /* | |
1178 | * Turns this: | |
1179 | * /foo/bar/waldo | |
1180 | * | |
1181 | * Into this: | |
1182 | * /foo/bar/.#<extra>waldobaa2a261115984a9 | |
1183 | */ | |
1184 | ||
1185 | fn = basename(p); | |
1186 | if (!filename_is_valid(fn)) | |
1187 | return -EINVAL; | |
1188 | ||
1189 | if (!extra) | |
1190 | extra = ""; | |
1191 | ||
1192 | t = new(char, strlen(p) + 2 + strlen(extra) + 16 + 1); | |
1193 | if (!t) | |
1194 | return -ENOMEM; | |
1195 | ||
1196 | x = stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn); | |
1197 | ||
1198 | u = random_u64(); | |
1199 | for (i = 0; i < 16; i++) { | |
1200 | *(x++) = hexchar(u & 0xF); | |
1201 | u >>= 4; | |
1202 | } | |
1203 | ||
1204 | *x = 0; | |
1205 | ||
1206 | *ret = path_kill_slashes(t); | |
1207 | return 0; | |
1208 | } | |
1209 | ||
1210 | int tempfn_random_child(const char *p, const char *extra, char **ret) { | |
1211 | char *t, *x; | |
1212 | uint64_t u; | |
1213 | unsigned i; | |
992e8f22 | 1214 | int r; |
0d39fa9c | 1215 | |
0d39fa9c LP |
1216 | assert(ret); |
1217 | ||
1218 | /* Turns this: | |
1219 | * /foo/bar/waldo | |
1220 | * Into this: | |
1221 | * /foo/bar/waldo/.#<extra>3c2b6219aa75d7d0 | |
1222 | */ | |
1223 | ||
992e8f22 LP |
1224 | if (!p) { |
1225 | r = tmp_dir(&p); | |
1226 | if (r < 0) | |
1227 | return r; | |
1228 | } | |
1229 | ||
0d39fa9c LP |
1230 | if (!extra) |
1231 | extra = ""; | |
1232 | ||
1233 | t = new(char, strlen(p) + 3 + strlen(extra) + 16 + 1); | |
1234 | if (!t) | |
1235 | return -ENOMEM; | |
1236 | ||
1237 | x = stpcpy(stpcpy(stpcpy(t, p), "/.#"), extra); | |
1238 | ||
1239 | u = random_u64(); | |
1240 | for (i = 0; i < 16; i++) { | |
1241 | *(x++) = hexchar(u & 0xF); | |
1242 | u >>= 4; | |
1243 | } | |
1244 | ||
1245 | *x = 0; | |
1246 | ||
1247 | *ret = path_kill_slashes(t); | |
1248 | return 0; | |
1249 | } | |
33d52ab9 LP |
1250 | |
1251 | int write_timestamp_file_atomic(const char *fn, usec_t n) { | |
1252 | char ln[DECIMAL_STR_MAX(n)+2]; | |
1253 | ||
1254 | /* Creates a "timestamp" file, that contains nothing but a | |
1255 | * usec_t timestamp, formatted in ASCII. */ | |
1256 | ||
1257 | if (n <= 0 || n >= USEC_INFINITY) | |
1258 | return -ERANGE; | |
1259 | ||
1260 | xsprintf(ln, USEC_FMT "\n", n); | |
1261 | ||
1262 | return write_string_file(fn, ln, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC); | |
1263 | } | |
1264 | ||
1265 | int read_timestamp_file(const char *fn, usec_t *ret) { | |
1266 | _cleanup_free_ char *ln = NULL; | |
1267 | uint64_t t; | |
1268 | int r; | |
1269 | ||
1270 | r = read_one_line_file(fn, &ln); | |
1271 | if (r < 0) | |
1272 | return r; | |
1273 | ||
1274 | r = safe_atou64(ln, &t); | |
1275 | if (r < 0) | |
1276 | return r; | |
1277 | ||
1278 | if (t <= 0 || t >= (uint64_t) USEC_INFINITY) | |
1279 | return -ERANGE; | |
1280 | ||
1281 | *ret = (usec_t) t; | |
1282 | return 0; | |
1283 | } | |
d390f8ef LP |
1284 | |
1285 | int fputs_with_space(FILE *f, const char *s, const char *separator, bool *space) { | |
1286 | int r; | |
1287 | ||
1288 | assert(s); | |
1289 | ||
1290 | /* Outputs the specified string with fputs(), but optionally prefixes it with a separator. The *space parameter | |
1291 | * when specified shall initially point to a boolean variable initialized to false. It is set to true after the | |
1292 | * first invocation. This call is supposed to be use in loops, where a separator shall be inserted between each | |
1293 | * element, but not before the first one. */ | |
1294 | ||
1295 | if (!f) | |
1296 | f = stdout; | |
1297 | ||
1298 | if (space) { | |
1299 | if (!separator) | |
1300 | separator = " "; | |
1301 | ||
1302 | if (*space) { | |
1303 | r = fputs(separator, f); | |
1304 | if (r < 0) | |
1305 | return r; | |
1306 | } | |
1307 | ||
1308 | *space = true; | |
1309 | } | |
1310 | ||
1311 | return fputs(s, f); | |
1312 | } | |
03532f0a LP |
1313 | |
1314 | int open_tmpfile_unlinkable(const char *directory, int flags) { | |
1315 | char *p; | |
992e8f22 | 1316 | int fd, r; |
03532f0a | 1317 | |
992e8f22 LP |
1318 | if (!directory) { |
1319 | r = tmp_dir(&directory); | |
1320 | if (r < 0) | |
1321 | return r; | |
1322 | } | |
03532f0a LP |
1323 | |
1324 | /* Returns an unlinked temporary file that cannot be linked into the file system anymore */ | |
1325 | ||
03532f0a LP |
1326 | /* Try O_TMPFILE first, if it is supported */ |
1327 | fd = open(directory, flags|O_TMPFILE|O_EXCL, S_IRUSR|S_IWUSR); | |
1328 | if (fd >= 0) | |
1329 | return fd; | |
03532f0a LP |
1330 | |
1331 | /* Fall back to unguessable name + unlinking */ | |
1332 | p = strjoina(directory, "/systemd-tmp-XXXXXX"); | |
1333 | ||
646853bd | 1334 | fd = mkostemp_safe(p); |
03532f0a LP |
1335 | if (fd < 0) |
1336 | return fd; | |
1337 | ||
1338 | (void) unlink(p); | |
1339 | ||
1340 | return fd; | |
1341 | } | |
1342 | ||
1343 | int open_tmpfile_linkable(const char *target, int flags, char **ret_path) { | |
1344 | _cleanup_free_ char *tmp = NULL; | |
1345 | int r, fd; | |
1346 | ||
1347 | assert(target); | |
1348 | assert(ret_path); | |
1349 | ||
1350 | /* Don't allow O_EXCL, as that has a special meaning for O_TMPFILE */ | |
1351 | assert((flags & O_EXCL) == 0); | |
1352 | ||
1353 | /* Creates a temporary file, that shall be renamed to "target" later. If possible, this uses O_TMPFILE – in | |
1354 | * which case "ret_path" will be returned as NULL. If not possible a the tempoary path name used is returned in | |
1355 | * "ret_path". Use link_tmpfile() below to rename the result after writing the file in full. */ | |
1356 | ||
03532f0a LP |
1357 | { |
1358 | _cleanup_free_ char *dn = NULL; | |
1359 | ||
1360 | dn = dirname_malloc(target); | |
1361 | if (!dn) | |
1362 | return -ENOMEM; | |
1363 | ||
1364 | fd = open(dn, O_TMPFILE|flags, 0640); | |
1365 | if (fd >= 0) { | |
1366 | *ret_path = NULL; | |
1367 | return fd; | |
1368 | } | |
1369 | ||
1370 | log_debug_errno(errno, "Failed to use O_TMPFILE on %s: %m", dn); | |
1371 | } | |
03532f0a LP |
1372 | |
1373 | r = tempfn_random(target, NULL, &tmp); | |
1374 | if (r < 0) | |
1375 | return r; | |
1376 | ||
1377 | fd = open(tmp, O_CREAT|O_EXCL|O_NOFOLLOW|O_NOCTTY|flags, 0640); | |
1378 | if (fd < 0) | |
1379 | return -errno; | |
1380 | ||
1381 | *ret_path = tmp; | |
1382 | tmp = NULL; | |
1383 | ||
1384 | return fd; | |
1385 | } | |
1386 | ||
504afd7c ZJS |
1387 | int open_serialization_fd(const char *ident) { |
1388 | int fd = -1; | |
1389 | ||
1390 | fd = memfd_create(ident, MFD_CLOEXEC); | |
1391 | if (fd < 0) { | |
1392 | const char *path; | |
1393 | ||
1394 | path = getpid() == 1 ? "/run/systemd" : "/tmp"; | |
1395 | fd = open_tmpfile_unlinkable(path, O_RDWR|O_CLOEXEC); | |
1396 | if (fd < 0) | |
1397 | return fd; | |
1398 | ||
1399 | log_debug("Serializing %s to %s.", ident, path); | |
1400 | } else | |
1401 | log_debug("Serializing %s to memfd.", ident); | |
1402 | ||
1403 | return fd; | |
1404 | } | |
1405 | ||
03532f0a LP |
1406 | int link_tmpfile(int fd, const char *path, const char *target) { |
1407 | ||
1408 | assert(fd >= 0); | |
1409 | assert(target); | |
1410 | ||
1411 | /* Moves a temporary file created with open_tmpfile() above into its final place. if "path" is NULL an fd | |
1412 | * created with O_TMPFILE is assumed, and linkat() is used. Otherwise it is assumed O_TMPFILE is not supported | |
1413 | * on the directory, and renameat2() is used instead. | |
1414 | * | |
f8e2f4d6 | 1415 | * Note that in both cases we will not replace existing files. This is because linkat() does not support this |
03532f0a LP |
1416 | * operation currently (renameat2() does), and there is no nice way to emulate this. */ |
1417 | ||
1418 | if (path) { | |
1419 | if (rename_noreplace(AT_FDCWD, path, AT_FDCWD, target) < 0) | |
1420 | return -errno; | |
1421 | } else { | |
1422 | char proc_fd_path[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(fd) + 1]; | |
1423 | ||
1424 | xsprintf(proc_fd_path, "/proc/self/fd/%i", fd); | |
1425 | ||
1426 | if (linkat(AT_FDCWD, proc_fd_path, AT_FDCWD, target, AT_SYMLINK_FOLLOW) < 0) | |
1427 | return -errno; | |
1428 | } | |
1429 | ||
1430 | return 0; | |
1431 | } | |
03c2b288 LP |
1432 | |
1433 | int read_nul_string(FILE *f, char **ret) { | |
1434 | _cleanup_free_ char *x = NULL; | |
1435 | size_t allocated = 0, n = 0; | |
1436 | ||
1437 | assert(f); | |
1438 | assert(ret); | |
1439 | ||
1440 | /* Reads a NUL-terminated string from the specified file. */ | |
1441 | ||
1442 | for (;;) { | |
1443 | int c; | |
1444 | ||
1445 | if (!GREEDY_REALLOC(x, allocated, n+2)) | |
1446 | return -ENOMEM; | |
1447 | ||
1448 | c = fgetc(f); | |
1449 | if (c == 0) /* Terminate at NUL byte */ | |
1450 | break; | |
1451 | if (c == EOF) { | |
1452 | if (ferror(f)) | |
1453 | return -errno; | |
1454 | break; /* Terminate at EOF */ | |
1455 | } | |
1456 | ||
1457 | x[n++] = (char) c; | |
1458 | } | |
1459 | ||
1460 | if (x) | |
1461 | x[n] = 0; | |
1462 | else { | |
1463 | x = new0(char, 1); | |
1464 | if (!x) | |
1465 | return -ENOMEM; | |
1466 | } | |
1467 | ||
1468 | *ret = x; | |
1469 | x = NULL; | |
1470 | ||
1471 | return 0; | |
1472 | } | |
676bcb0f LP |
1473 | |
1474 | int mkdtemp_malloc(const char *template, char **ret) { | |
1475 | char *p; | |
1476 | ||
1477 | assert(template); | |
1478 | assert(ret); | |
1479 | ||
1480 | p = strdup(template); | |
1481 | if (!p) | |
1482 | return -ENOMEM; | |
1483 | ||
1484 | if (!mkdtemp(p)) { | |
1485 | free(p); | |
1486 | return -errno; | |
1487 | } | |
1488 | ||
1489 | *ret = p; | |
1490 | return 0; | |
1491 | } |