]>
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 | 43 | #include "path-util.h" |
df0ff127 | 44 | #include "process-util.h" |
0d39fa9c | 45 | #include "random-util.h" |
33d52ab9 | 46 | #include "stdio-util.h" |
07630cea | 47 | #include "string-util.h" |
a5c32cff | 48 | #include "strv.h" |
93cc7779 | 49 | #include "time-util.h" |
affb60b1 | 50 | #include "umask-util.h" |
335c46b5 | 51 | #include "utf8.h" |
a5c32cff | 52 | |
c2d11a63 VC |
53 | #define READ_FULL_BYTES_MAX (4U*1024U*1024U) |
54 | ||
39c38d77 | 55 | int write_string_stream_ts(FILE *f, const char *line, bool enforce_newline, struct timespec *ts) { |
dacd6cee | 56 | |
717603e3 LP |
57 | assert(f); |
58 | assert(line); | |
59 | ||
fec6fc6b | 60 | fputs(line, f); |
40beecdb | 61 | if (enforce_newline && !endswith(line, "\n")) |
a5c32cff HH |
62 | fputc('\n', f); |
63 | ||
39c38d77 ZJS |
64 | if (ts) { |
65 | struct timespec twice[2] = {*ts, *ts}; | |
66 | ||
67 | if (futimens(fileno(f), twice) < 0) | |
68 | return -errno; | |
69 | } | |
70 | ||
dacd6cee | 71 | return fflush_and_check(f); |
a5c32cff HH |
72 | } |
73 | ||
4c1fc3e4 | 74 | static int write_string_file_atomic(const char *fn, const char *line, bool enforce_newline) { |
a5c32cff HH |
75 | _cleanup_fclose_ FILE *f = NULL; |
76 | _cleanup_free_ char *p = NULL; | |
77 | int r; | |
78 | ||
79 | assert(fn); | |
80 | assert(line); | |
81 | ||
82 | r = fopen_temporary(fn, &f, &p); | |
83 | if (r < 0) | |
84 | return r; | |
85 | ||
0d39fa9c | 86 | (void) fchmod_umask(fileno(f), 0644); |
a5c32cff | 87 | |
4c1fc3e4 | 88 | r = write_string_stream(f, line, enforce_newline); |
f2997962 | 89 | if (r >= 0) { |
a5c32cff HH |
90 | if (rename(p, fn) < 0) |
91 | r = -errno; | |
a5c32cff HH |
92 | } |
93 | ||
a5c32cff | 94 | if (r < 0) |
0d39fa9c | 95 | (void) unlink(p); |
a5c32cff HH |
96 | |
97 | return r; | |
98 | } | |
99 | ||
39c38d77 | 100 | int write_string_file_ts(const char *fn, const char *line, WriteStringFileFlags flags, struct timespec *ts) { |
4c1fc3e4 | 101 | _cleanup_fclose_ FILE *f = NULL; |
eb3da901 | 102 | int q, r; |
4c1fc3e4 DM |
103 | |
104 | assert(fn); | |
105 | assert(line); | |
106 | ||
107 | if (flags & WRITE_STRING_FILE_ATOMIC) { | |
108 | assert(flags & WRITE_STRING_FILE_CREATE); | |
109 | ||
eb3da901 LP |
110 | r = write_string_file_atomic(fn, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE)); |
111 | if (r < 0) | |
112 | goto fail; | |
113 | ||
114 | return r; | |
39c38d77 ZJS |
115 | } else |
116 | assert(ts == NULL); | |
4c1fc3e4 DM |
117 | |
118 | if (flags & WRITE_STRING_FILE_CREATE) { | |
119 | f = fopen(fn, "we"); | |
eb3da901 LP |
120 | if (!f) { |
121 | r = -errno; | |
122 | goto fail; | |
123 | } | |
4c1fc3e4 DM |
124 | } else { |
125 | int fd; | |
126 | ||
127 | /* We manually build our own version of fopen(..., "we") that | |
128 | * works without O_CREAT */ | |
129 | fd = open(fn, O_WRONLY|O_CLOEXEC|O_NOCTTY); | |
eb3da901 LP |
130 | if (fd < 0) { |
131 | r = -errno; | |
132 | goto fail; | |
133 | } | |
4c1fc3e4 DM |
134 | |
135 | f = fdopen(fd, "we"); | |
136 | if (!f) { | |
eb3da901 | 137 | r = -errno; |
4c1fc3e4 | 138 | safe_close(fd); |
eb3da901 | 139 | goto fail; |
4c1fc3e4 DM |
140 | } |
141 | } | |
142 | ||
39c38d77 | 143 | r = write_string_stream_ts(f, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE), ts); |
eb3da901 LP |
144 | if (r < 0) |
145 | goto fail; | |
146 | ||
147 | return 0; | |
148 | ||
149 | fail: | |
150 | if (!(flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE)) | |
151 | return r; | |
152 | ||
153 | f = safe_fclose(f); | |
154 | ||
155 | /* OK, the operation failed, but let's see if the right | |
156 | * contents in place already. If so, eat up the error. */ | |
157 | ||
158 | q = verify_file(fn, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE)); | |
159 | if (q <= 0) | |
160 | return r; | |
161 | ||
162 | return 0; | |
4c1fc3e4 DM |
163 | } |
164 | ||
a5c32cff HH |
165 | int read_one_line_file(const char *fn, char **line) { |
166 | _cleanup_fclose_ FILE *f = NULL; | |
167 | char t[LINE_MAX], *c; | |
168 | ||
169 | assert(fn); | |
170 | assert(line); | |
171 | ||
172 | f = fopen(fn, "re"); | |
173 | if (!f) | |
174 | return -errno; | |
175 | ||
176 | if (!fgets(t, sizeof(t), f)) { | |
177 | ||
178 | if (ferror(f)) | |
f5e5c28f | 179 | return errno > 0 ? -errno : -EIO; |
a5c32cff HH |
180 | |
181 | t[0] = 0; | |
182 | } | |
183 | ||
184 | c = strdup(t); | |
185 | if (!c) | |
186 | return -ENOMEM; | |
187 | truncate_nl(c); | |
188 | ||
189 | *line = c; | |
190 | return 0; | |
191 | } | |
192 | ||
eb3da901 LP |
193 | int verify_file(const char *fn, const char *blob, bool accept_extra_nl) { |
194 | _cleanup_fclose_ FILE *f = NULL; | |
195 | _cleanup_free_ char *buf = NULL; | |
196 | size_t l, k; | |
15dee3f0 | 197 | |
eb3da901 LP |
198 | assert(fn); |
199 | assert(blob); | |
200 | ||
201 | l = strlen(blob); | |
202 | ||
203 | if (accept_extra_nl && endswith(blob, "\n")) | |
204 | accept_extra_nl = false; | |
205 | ||
206 | buf = malloc(l + accept_extra_nl + 1); | |
207 | if (!buf) | |
208 | return -ENOMEM; | |
209 | ||
210 | f = fopen(fn, "re"); | |
211 | if (!f) | |
212 | return -errno; | |
213 | ||
214 | /* We try to read one byte more than we need, so that we know whether we hit eof */ | |
215 | errno = 0; | |
216 | k = fread(buf, 1, l + accept_extra_nl + 1, f); | |
217 | if (ferror(f)) | |
218 | return errno > 0 ? -errno : -EIO; | |
219 | ||
220 | if (k != l && k != l + accept_extra_nl) | |
221 | return 0; | |
222 | if (memcmp(buf, blob, l) != 0) | |
223 | return 0; | |
224 | if (k > l && buf[l] != '\n') | |
225 | return 0; | |
15dee3f0 | 226 | |
eb3da901 | 227 | return 1; |
15dee3f0 LP |
228 | } |
229 | ||
717603e3 | 230 | int read_full_stream(FILE *f, char **contents, size_t *size) { |
a5c32cff HH |
231 | size_t n, l; |
232 | _cleanup_free_ char *buf = NULL; | |
233 | struct stat st; | |
234 | ||
717603e3 | 235 | assert(f); |
a5c32cff HH |
236 | assert(contents); |
237 | ||
a5c32cff HH |
238 | if (fstat(fileno(f), &st) < 0) |
239 | return -errno; | |
240 | ||
717603e3 | 241 | n = LINE_MAX; |
a5c32cff | 242 | |
717603e3 LP |
243 | if (S_ISREG(st.st_mode)) { |
244 | ||
245 | /* Safety check */ | |
c2d11a63 | 246 | if (st.st_size > READ_FULL_BYTES_MAX) |
717603e3 LP |
247 | return -E2BIG; |
248 | ||
249 | /* Start with the right file size, but be prepared for | |
250 | * files from /proc which generally report a file size | |
251 | * of 0 */ | |
252 | if (st.st_size > 0) | |
253 | n = st.st_size; | |
254 | } | |
a5c32cff | 255 | |
717603e3 | 256 | l = 0; |
a5c32cff HH |
257 | for (;;) { |
258 | char *t; | |
259 | size_t k; | |
260 | ||
c2d11a63 | 261 | t = realloc(buf, n + 1); |
a5c32cff HH |
262 | if (!t) |
263 | return -ENOMEM; | |
264 | ||
265 | buf = t; | |
266 | k = fread(buf + l, 1, n - l, f); | |
c2d11a63 VC |
267 | if (k > 0) |
268 | l += k; | |
a5c32cff | 269 | |
c2d11a63 VC |
270 | if (ferror(f)) |
271 | return -errno; | |
a5c32cff | 272 | |
c2d11a63 | 273 | if (feof(f)) |
a5c32cff | 274 | break; |
a5c32cff | 275 | |
c2d11a63 VC |
276 | /* We aren't expecting fread() to return a short read outside |
277 | * of (error && eof), assert buffer is full and enlarge buffer. | |
278 | */ | |
279 | assert(l == n); | |
a5c32cff HH |
280 | |
281 | /* Safety check */ | |
c2d11a63 | 282 | if (n >= READ_FULL_BYTES_MAX) |
a5c32cff | 283 | return -E2BIG; |
c2d11a63 | 284 | |
82b103a7 | 285 | n = MIN(n * 2, READ_FULL_BYTES_MAX); |
a5c32cff HH |
286 | } |
287 | ||
288 | buf[l] = 0; | |
289 | *contents = buf; | |
d78a28e3 | 290 | buf = NULL; /* do not free */ |
a5c32cff HH |
291 | |
292 | if (size) | |
293 | *size = l; | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
717603e3 LP |
298 | int read_full_file(const char *fn, char **contents, size_t *size) { |
299 | _cleanup_fclose_ FILE *f = NULL; | |
300 | ||
301 | assert(fn); | |
302 | assert(contents); | |
303 | ||
304 | f = fopen(fn, "re"); | |
305 | if (!f) | |
306 | return -errno; | |
307 | ||
308 | return read_full_stream(f, contents, size); | |
309 | } | |
310 | ||
f73141d7 | 311 | static int parse_env_file_internal( |
717603e3 | 312 | FILE *f, |
a5c32cff | 313 | const char *fname, |
f73141d7 | 314 | const char *newline, |
335c46b5 | 315 | int (*push) (const char *filename, unsigned line, |
a5f6c30d MS |
316 | const char *key, char *value, void *userdata, int *n_pushed), |
317 | void *userdata, | |
318 | int *n_pushed) { | |
f73141d7 LP |
319 | |
320 | _cleanup_free_ char *contents = NULL, *key = NULL; | |
2b77f67e | 321 | 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 |
322 | char *p, *value = NULL; |
323 | int r; | |
335c46b5 | 324 | unsigned line = 1; |
a5c32cff | 325 | |
f73141d7 LP |
326 | enum { |
327 | PRE_KEY, | |
328 | KEY, | |
f73141d7 LP |
329 | PRE_VALUE, |
330 | VALUE, | |
331 | VALUE_ESCAPE, | |
332 | SINGLE_QUOTE_VALUE, | |
333 | SINGLE_QUOTE_VALUE_ESCAPE, | |
334 | DOUBLE_QUOTE_VALUE, | |
335 | DOUBLE_QUOTE_VALUE_ESCAPE, | |
336 | COMMENT, | |
337 | COMMENT_ESCAPE | |
338 | } state = PRE_KEY; | |
a5c32cff | 339 | |
f73141d7 | 340 | assert(newline); |
a5c32cff | 341 | |
717603e3 LP |
342 | if (f) |
343 | r = read_full_stream(f, &contents, NULL); | |
344 | else | |
345 | r = read_full_file(fname, &contents, NULL); | |
1c17cbed | 346 | if (r < 0) |
a5c32cff HH |
347 | return r; |
348 | ||
f73141d7 LP |
349 | for (p = contents; *p; p++) { |
350 | char c = *p; | |
351 | ||
352 | switch (state) { | |
353 | ||
354 | case PRE_KEY: | |
ebc05a09 | 355 | if (strchr(COMMENTS, c)) |
f73141d7 LP |
356 | state = COMMENT; |
357 | else if (!strchr(WHITESPACE, c)) { | |
358 | state = KEY; | |
2b77f67e LP |
359 | last_key_whitespace = (size_t) -1; |
360 | ||
ca2d3784 | 361 | if (!GREEDY_REALLOC(key, key_alloc, n_key+2)) { |
f73141d7 LP |
362 | r = -ENOMEM; |
363 | goto fail; | |
364 | } | |
365 | ||
366 | key[n_key++] = c; | |
367 | } | |
368 | break; | |
369 | ||
370 | case KEY: | |
371 | if (strchr(newline, c)) { | |
372 | state = PRE_KEY; | |
313cefa1 | 373 | line++; |
f73141d7 | 374 | n_key = 0; |
2b77f67e | 375 | } else if (c == '=') { |
f73141d7 | 376 | state = PRE_VALUE; |
2b77f67e LP |
377 | last_value_whitespace = (size_t) -1; |
378 | } else { | |
379 | if (!strchr(WHITESPACE, c)) | |
380 | last_key_whitespace = (size_t) -1; | |
381 | else if (last_key_whitespace == (size_t) -1) | |
382 | last_key_whitespace = n_key; | |
383 | ||
ca2d3784 | 384 | if (!GREEDY_REALLOC(key, key_alloc, n_key+2)) { |
f73141d7 LP |
385 | r = -ENOMEM; |
386 | goto fail; | |
387 | } | |
388 | ||
389 | key[n_key++] = c; | |
390 | } | |
a5c32cff | 391 | |
f73141d7 LP |
392 | break; |
393 | ||
f73141d7 | 394 | case PRE_VALUE: |
98f59e59 | 395 | if (strchr(newline, c)) { |
f73141d7 | 396 | state = PRE_KEY; |
313cefa1 | 397 | line++; |
f73141d7 | 398 | key[n_key] = 0; |
a5c32cff | 399 | |
f73141d7 LP |
400 | if (value) |
401 | value[n_value] = 0; | |
a5c32cff | 402 | |
ebc05a09 | 403 | /* strip trailing whitespace from key */ |
2b77f67e LP |
404 | if (last_key_whitespace != (size_t) -1) |
405 | key[last_key_whitespace] = 0; | |
ebc05a09 | 406 | |
a5f6c30d | 407 | r = push(fname, line, key, value, userdata, n_pushed); |
f73141d7 LP |
408 | if (r < 0) |
409 | goto fail; | |
410 | ||
411 | n_key = 0; | |
412 | value = NULL; | |
413 | value_alloc = n_value = 0; | |
2b77f67e | 414 | |
f73141d7 LP |
415 | } else if (c == '\'') |
416 | state = SINGLE_QUOTE_VALUE; | |
417 | else if (c == '\"') | |
418 | state = DOUBLE_QUOTE_VALUE; | |
419 | else if (c == '\\') | |
420 | state = VALUE_ESCAPE; | |
421 | else if (!strchr(WHITESPACE, c)) { | |
422 | state = VALUE; | |
423 | ||
ca2d3784 | 424 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
425 | r = -ENOMEM; |
426 | goto fail; | |
427 | } | |
428 | ||
429 | value[n_value++] = c; | |
430 | } | |
431 | ||
432 | break; | |
433 | ||
434 | case VALUE: | |
435 | if (strchr(newline, c)) { | |
436 | state = PRE_KEY; | |
313cefa1 | 437 | line++; |
98f59e59 | 438 | |
f73141d7 LP |
439 | key[n_key] = 0; |
440 | ||
441 | if (value) | |
442 | value[n_value] = 0; | |
443 | ||
2b77f67e LP |
444 | /* Chomp off trailing whitespace from value */ |
445 | if (last_value_whitespace != (size_t) -1) | |
446 | value[last_value_whitespace] = 0; | |
f73141d7 | 447 | |
ebc05a09 | 448 | /* strip trailing whitespace from key */ |
2b77f67e LP |
449 | if (last_key_whitespace != (size_t) -1) |
450 | key[last_key_whitespace] = 0; | |
ebc05a09 | 451 | |
a5f6c30d | 452 | r = push(fname, line, key, value, userdata, n_pushed); |
f73141d7 LP |
453 | if (r < 0) |
454 | goto fail; | |
455 | ||
456 | n_key = 0; | |
457 | value = NULL; | |
458 | value_alloc = n_value = 0; | |
2b77f67e | 459 | |
f73141d7 LP |
460 | } else if (c == '\\') { |
461 | state = VALUE_ESCAPE; | |
2b77f67e | 462 | last_value_whitespace = (size_t) -1; |
f73141d7 LP |
463 | } else { |
464 | if (!strchr(WHITESPACE, c)) | |
2b77f67e LP |
465 | last_value_whitespace = (size_t) -1; |
466 | else if (last_value_whitespace == (size_t) -1) | |
467 | last_value_whitespace = n_value; | |
f73141d7 | 468 | |
ca2d3784 | 469 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
470 | r = -ENOMEM; |
471 | goto fail; | |
472 | } | |
473 | ||
474 | value[n_value++] = c; | |
475 | } | |
476 | ||
477 | break; | |
478 | ||
479 | case VALUE_ESCAPE: | |
480 | state = VALUE; | |
481 | ||
482 | if (!strchr(newline, c)) { | |
483 | /* Escaped newlines we eat up entirely */ | |
ca2d3784 | 484 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
485 | r = -ENOMEM; |
486 | goto fail; | |
487 | } | |
488 | ||
489 | value[n_value++] = c; | |
490 | } | |
491 | break; | |
492 | ||
493 | case SINGLE_QUOTE_VALUE: | |
494 | if (c == '\'') | |
495 | state = PRE_VALUE; | |
496 | else if (c == '\\') | |
497 | state = SINGLE_QUOTE_VALUE_ESCAPE; | |
498 | else { | |
ca2d3784 | 499 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
500 | r = -ENOMEM; |
501 | goto fail; | |
502 | } | |
a5c32cff | 503 | |
f73141d7 LP |
504 | value[n_value++] = c; |
505 | } | |
a5c32cff | 506 | |
f73141d7 | 507 | break; |
a5c32cff | 508 | |
f73141d7 LP |
509 | case SINGLE_QUOTE_VALUE_ESCAPE: |
510 | state = SINGLE_QUOTE_VALUE; | |
a5c32cff | 511 | |
f73141d7 | 512 | if (!strchr(newline, c)) { |
ca2d3784 | 513 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
a5c32cff | 514 | r = -ENOMEM; |
a5c32cff HH |
515 | goto fail; |
516 | } | |
517 | ||
f73141d7 LP |
518 | value[n_value++] = c; |
519 | } | |
520 | break; | |
521 | ||
522 | case DOUBLE_QUOTE_VALUE: | |
523 | if (c == '\"') | |
524 | state = PRE_VALUE; | |
525 | else if (c == '\\') | |
526 | state = DOUBLE_QUOTE_VALUE_ESCAPE; | |
527 | else { | |
ca2d3784 | 528 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
529 | r = -ENOMEM; |
530 | goto fail; | |
a5c32cff HH |
531 | } |
532 | ||
f73141d7 LP |
533 | value[n_value++] = c; |
534 | } | |
535 | ||
536 | break; | |
537 | ||
538 | case DOUBLE_QUOTE_VALUE_ESCAPE: | |
539 | state = DOUBLE_QUOTE_VALUE; | |
a5c32cff | 540 | |
f73141d7 | 541 | if (!strchr(newline, c)) { |
ca2d3784 | 542 | if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) { |
f73141d7 LP |
543 | r = -ENOMEM; |
544 | goto fail; | |
545 | } | |
a5c32cff | 546 | |
f73141d7 | 547 | value[n_value++] = c; |
a5c32cff | 548 | } |
f73141d7 LP |
549 | break; |
550 | ||
551 | case COMMENT: | |
552 | if (c == '\\') | |
553 | state = COMMENT_ESCAPE; | |
335c46b5 | 554 | else if (strchr(newline, c)) { |
f73141d7 | 555 | state = PRE_KEY; |
313cefa1 | 556 | line++; |
335c46b5 | 557 | } |
f73141d7 LP |
558 | break; |
559 | ||
560 | case COMMENT_ESCAPE: | |
561 | state = COMMENT; | |
562 | break; | |
a5c32cff | 563 | } |
f73141d7 LP |
564 | } |
565 | ||
371328dc ZJS |
566 | if (IN_SET(state, |
567 | PRE_VALUE, | |
568 | VALUE, | |
569 | VALUE_ESCAPE, | |
570 | SINGLE_QUOTE_VALUE, | |
571 | SINGLE_QUOTE_VALUE_ESCAPE, | |
572 | DOUBLE_QUOTE_VALUE, | |
573 | DOUBLE_QUOTE_VALUE_ESCAPE)) { | |
a5c32cff | 574 | |
f73141d7 LP |
575 | key[n_key] = 0; |
576 | ||
577 | if (value) | |
578 | value[n_value] = 0; | |
579 | ||
2b77f67e LP |
580 | if (state == VALUE) |
581 | if (last_value_whitespace != (size_t) -1) | |
582 | value[last_value_whitespace] = 0; | |
583 | ||
ebc05a09 | 584 | /* strip trailing whitespace from key */ |
2b77f67e LP |
585 | if (last_key_whitespace != (size_t) -1) |
586 | key[last_key_whitespace] = 0; | |
ebc05a09 | 587 | |
a5f6c30d | 588 | r = push(fname, line, key, value, userdata, n_pushed); |
f73141d7 LP |
589 | if (r < 0) |
590 | goto fail; | |
a5c32cff HH |
591 | } |
592 | ||
f73141d7 LP |
593 | return 0; |
594 | ||
a5c32cff | 595 | fail: |
f73141d7 | 596 | free(value); |
a5c32cff HH |
597 | return r; |
598 | } | |
599 | ||
ac466818 | 600 | static int check_utf8ness_and_warn( |
717603e3 | 601 | const char *filename, unsigned line, |
ac466818 | 602 | const char *key, char *value) { |
f27f0e21 GB |
603 | |
604 | if (!utf8_is_valid(key)) { | |
3587161a | 605 | _cleanup_free_ char *p = NULL; |
550a40ec | 606 | |
717603e3 LP |
607 | p = utf8_escape_invalid(key); |
608 | log_error("%s:%u: invalid UTF-8 in key '%s', ignoring.", strna(filename), line, p); | |
f27f0e21 GB |
609 | return -EINVAL; |
610 | } | |
611 | ||
612 | if (value && !utf8_is_valid(value)) { | |
3587161a | 613 | _cleanup_free_ char *p = NULL; |
550a40ec | 614 | |
717603e3 LP |
615 | p = utf8_escape_invalid(value); |
616 | log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, p); | |
f27f0e21 GB |
617 | return -EINVAL; |
618 | } | |
a5c32cff | 619 | |
ac466818 ZJS |
620 | return 0; |
621 | } | |
622 | ||
623 | static int parse_env_file_push( | |
624 | const char *filename, unsigned line, | |
625 | const char *key, char *value, | |
626 | void *userdata, | |
627 | int *n_pushed) { | |
628 | ||
629 | const char *k; | |
630 | va_list aq, *ap = userdata; | |
631 | int r; | |
632 | ||
633 | r = check_utf8ness_and_warn(filename, line, key, value); | |
634 | if (r < 0) | |
635 | return r; | |
636 | ||
f27f0e21 | 637 | va_copy(aq, *ap); |
a5c32cff | 638 | |
f27f0e21 GB |
639 | while ((k = va_arg(aq, const char *))) { |
640 | char **v; | |
a5c32cff | 641 | |
f27f0e21 | 642 | v = va_arg(aq, char **); |
a5c32cff | 643 | |
f27f0e21 GB |
644 | if (streq(key, k)) { |
645 | va_end(aq); | |
646 | free(*v); | |
647 | *v = value; | |
a5f6c30d MS |
648 | |
649 | if (n_pushed) | |
650 | (*n_pushed)++; | |
651 | ||
f27f0e21 | 652 | return 1; |
f73141d7 | 653 | } |
335c46b5 | 654 | } |
a5c32cff | 655 | |
f27f0e21 | 656 | va_end(aq); |
f73141d7 | 657 | free(value); |
717603e3 | 658 | |
f73141d7 LP |
659 | return 0; |
660 | } | |
a5c32cff | 661 | |
f73141d7 LP |
662 | int parse_env_file( |
663 | const char *fname, | |
664 | const char *newline, ...) { | |
a5c32cff | 665 | |
f73141d7 | 666 | va_list ap; |
a5f6c30d | 667 | int r, n_pushed = 0; |
a5c32cff | 668 | |
f73141d7 LP |
669 | if (!newline) |
670 | newline = NEWLINE; | |
a5c32cff | 671 | |
f73141d7 | 672 | va_start(ap, newline); |
a5f6c30d | 673 | r = parse_env_file_internal(NULL, fname, newline, parse_env_file_push, &ap, &n_pushed); |
f73141d7 | 674 | va_end(ap); |
a5c32cff | 675 | |
a5f6c30d | 676 | return r < 0 ? r : n_pushed; |
f73141d7 | 677 | } |
a5c32cff | 678 | |
717603e3 LP |
679 | static int load_env_file_push( |
680 | const char *filename, unsigned line, | |
681 | const char *key, char *value, | |
a5f6c30d MS |
682 | void *userdata, |
683 | int *n_pushed) { | |
f27f0e21 GB |
684 | char ***m = userdata; |
685 | char *p; | |
686 | int r; | |
a5c32cff | 687 | |
ac466818 ZJS |
688 | r = check_utf8ness_and_warn(filename, line, key, value); |
689 | if (r < 0) | |
690 | return r; | |
a5c32cff | 691 | |
99003e01 | 692 | p = strjoin(key, "=", value); |
f27f0e21 GB |
693 | if (!p) |
694 | return -ENOMEM; | |
335c46b5 | 695 | |
99003e01 ZJS |
696 | r = strv_env_replace(m, p); |
697 | if (r < 0) { | |
698 | free(p); | |
f27f0e21 | 699 | return r; |
99003e01 | 700 | } |
a5c32cff | 701 | |
a5f6c30d MS |
702 | if (n_pushed) |
703 | (*n_pushed)++; | |
704 | ||
f73141d7 LP |
705 | free(value); |
706 | return 0; | |
707 | } | |
708 | ||
717603e3 LP |
709 | int load_env_file(FILE *f, const char *fname, const char *newline, char ***rl) { |
710 | char **m = NULL; | |
711 | int r; | |
712 | ||
713 | if (!newline) | |
714 | newline = NEWLINE; | |
715 | ||
a5f6c30d | 716 | r = parse_env_file_internal(f, fname, newline, load_env_file_push, &m, NULL); |
717603e3 LP |
717 | if (r < 0) { |
718 | strv_free(m); | |
719 | return r; | |
720 | } | |
721 | ||
722 | *rl = m; | |
723 | return 0; | |
724 | } | |
725 | ||
726 | static int load_env_file_push_pairs( | |
727 | const char *filename, unsigned line, | |
728 | const char *key, char *value, | |
a5f6c30d MS |
729 | void *userdata, |
730 | int *n_pushed) { | |
717603e3 LP |
731 | char ***m = userdata; |
732 | int r; | |
733 | ||
ac466818 ZJS |
734 | r = check_utf8ness_and_warn(filename, line, key, value); |
735 | if (r < 0) | |
736 | return r; | |
717603e3 LP |
737 | |
738 | r = strv_extend(m, key); | |
739 | if (r < 0) | |
740 | return -ENOMEM; | |
741 | ||
742 | if (!value) { | |
743 | r = strv_extend(m, ""); | |
744 | if (r < 0) | |
745 | return -ENOMEM; | |
746 | } else { | |
747 | r = strv_push(m, value); | |
748 | if (r < 0) | |
749 | return r; | |
750 | } | |
751 | ||
a5f6c30d MS |
752 | if (n_pushed) |
753 | (*n_pushed)++; | |
754 | ||
717603e3 LP |
755 | return 0; |
756 | } | |
757 | ||
758 | int load_env_file_pairs(FILE *f, const char *fname, const char *newline, char ***rl) { | |
f73141d7 LP |
759 | char **m = NULL; |
760 | int r; | |
a5c32cff | 761 | |
f73141d7 LP |
762 | if (!newline) |
763 | newline = NEWLINE; | |
764 | ||
a5f6c30d | 765 | r = parse_env_file_internal(f, fname, newline, load_env_file_push_pairs, &m, NULL); |
f73141d7 LP |
766 | if (r < 0) { |
767 | strv_free(m); | |
768 | return r; | |
a5c32cff HH |
769 | } |
770 | ||
771 | *rl = m; | |
a5c32cff HH |
772 | return 0; |
773 | } | |
774 | ||
37f3ffca RS |
775 | static int merge_env_file_push( |
776 | const char *filename, unsigned line, | |
777 | const char *key, char *value, | |
778 | void *userdata, | |
779 | int *n_pushed) { | |
780 | ||
781 | char ***env = userdata; | |
782 | char *expanded_value; | |
783 | ||
784 | assert(env); | |
785 | ||
184d1904 ZJS |
786 | if (!value) { |
787 | log_error("%s:%u: invalid syntax (around \"%s\"), ignoring.", strna(filename), line, key); | |
788 | return 0; | |
789 | } | |
790 | ||
791 | if (!env_name_is_valid(key)) { | |
792 | log_error("%s:%u: invalid variable name \"%s\", ignoring.", strna(filename), line, key); | |
2ea8081a | 793 | free(value); |
184d1904 ZJS |
794 | return 0; |
795 | } | |
796 | ||
ccad1fd0 | 797 | expanded_value = replace_env(value, *env, |
b82f58bf RS |
798 | REPLACE_ENV_USE_ENVIRONMENT| |
799 | REPLACE_ENV_ALLOW_BRACELESS| | |
800 | REPLACE_ENV_ALLOW_EXTENDED); | |
37f3ffca RS |
801 | if (!expanded_value) |
802 | return -ENOMEM; | |
803 | ||
804 | free_and_replace(value, expanded_value); | |
805 | ||
806 | return load_env_file_push(filename, line, key, value, env, n_pushed); | |
807 | } | |
808 | ||
809 | int merge_env_file( | |
810 | char ***env, | |
811 | FILE *f, | |
812 | const char *fname) { | |
813 | ||
ccad1fd0 | 814 | /* NOTE: this function supports braceful and braceless variable expansions, |
b82f58bf | 815 | * plus "extended" substitutions, unlike other exported parsing functions. |
ccad1fd0 ZJS |
816 | */ |
817 | ||
37f3ffca RS |
818 | return parse_env_file_internal(f, fname, NEWLINE, merge_env_file_push, env, NULL); |
819 | } | |
820 | ||
768100ef LP |
821 | static void write_env_var(FILE *f, const char *v) { |
822 | const char *p; | |
823 | ||
824 | p = strchr(v, '='); | |
825 | if (!p) { | |
826 | /* Fallback */ | |
4b61c875 LP |
827 | fputs_unlocked(v, f); |
828 | fputc_unlocked('\n', f); | |
768100ef LP |
829 | return; |
830 | } | |
831 | ||
832 | p++; | |
4b61c875 | 833 | fwrite_unlocked(v, 1, p-v, f); |
768100ef | 834 | |
0ce5a806 | 835 | if (string_has_cc(p, NULL) || chars_intersect(p, WHITESPACE SHELL_NEED_QUOTES)) { |
4b61c875 | 836 | fputc_unlocked('\"', f); |
768100ef LP |
837 | |
838 | for (; *p; p++) { | |
0ce5a806 | 839 | if (strchr(SHELL_NEED_ESCAPE, *p)) |
4b61c875 | 840 | fputc_unlocked('\\', f); |
768100ef | 841 | |
4b61c875 | 842 | fputc_unlocked(*p, f); |
768100ef LP |
843 | } |
844 | ||
4b61c875 | 845 | fputc_unlocked('\"', f); |
768100ef | 846 | } else |
4b61c875 | 847 | fputs_unlocked(p, f); |
768100ef | 848 | |
4b61c875 | 849 | fputc_unlocked('\n', f); |
768100ef LP |
850 | } |
851 | ||
a5c32cff | 852 | int write_env_file(const char *fname, char **l) { |
7fd1b19b | 853 | _cleanup_fclose_ FILE *f = NULL; |
736937e5 LP |
854 | _cleanup_free_ char *p = NULL; |
855 | char **i; | |
a5c32cff HH |
856 | int r; |
857 | ||
736937e5 LP |
858 | assert(fname); |
859 | ||
a5c32cff HH |
860 | r = fopen_temporary(fname, &f, &p); |
861 | if (r < 0) | |
862 | return r; | |
863 | ||
864 | fchmod_umask(fileno(f), 0644); | |
865 | ||
768100ef LP |
866 | STRV_FOREACH(i, l) |
867 | write_env_var(f, *i); | |
a5c32cff | 868 | |
736937e5 LP |
869 | r = fflush_and_check(f); |
870 | if (r >= 0) { | |
871 | if (rename(p, fname) >= 0) | |
872 | return 0; | |
a5c32cff | 873 | |
736937e5 | 874 | r = -errno; |
a5c32cff HH |
875 | } |
876 | ||
736937e5 | 877 | unlink(p); |
a5c32cff HH |
878 | return r; |
879 | } | |
68fee104 ZJS |
880 | |
881 | int executable_is_script(const char *path, char **interpreter) { | |
882 | int r; | |
c8b32e11 | 883 | _cleanup_free_ char *line = NULL; |
68fee104 ZJS |
884 | int len; |
885 | char *ans; | |
886 | ||
887 | assert(path); | |
888 | ||
889 | r = read_one_line_file(path, &line); | |
890 | if (r < 0) | |
891 | return r; | |
892 | ||
893 | if (!startswith(line, "#!")) | |
894 | return 0; | |
895 | ||
896 | ans = strstrip(line + 2); | |
897 | len = strcspn(ans, " \t"); | |
898 | ||
899 | if (len == 0) | |
900 | return 0; | |
901 | ||
902 | ans = strndup(ans, len); | |
903 | if (!ans) | |
904 | return -ENOMEM; | |
905 | ||
906 | *interpreter = ans; | |
907 | return 1; | |
908 | } | |
69ab8088 ZJS |
909 | |
910 | /** | |
0a7b53bd | 911 | * Retrieve one field from a file like /proc/self/status. pattern |
c4cd1d4d AK |
912 | * should not include whitespace or the delimiter (':'). pattern matches only |
913 | * the beginning of a line. Whitespace before ':' is skipped. Whitespace and | |
914 | * zeros after the ':' will be skipped. field must be freed afterwards. | |
915 | * terminator specifies the terminating characters of the field value (not | |
916 | * included in the value). | |
69ab8088 | 917 | */ |
c4cd1d4d | 918 | int get_proc_field(const char *filename, const char *pattern, const char *terminator, char **field) { |
69ab8088 | 919 | _cleanup_free_ char *status = NULL; |
90110825 | 920 | char *t, *f; |
69ab8088 ZJS |
921 | size_t len; |
922 | int r; | |
923 | ||
c4cd1d4d | 924 | assert(terminator); |
69ab8088 | 925 | assert(filename); |
7ff7394d | 926 | assert(pattern); |
69ab8088 ZJS |
927 | assert(field); |
928 | ||
929 | r = read_full_file(filename, &status, NULL); | |
930 | if (r < 0) | |
931 | return r; | |
932 | ||
c4cd1d4d AK |
933 | t = status; |
934 | ||
935 | do { | |
936 | bool pattern_ok; | |
937 | ||
938 | do { | |
939 | t = strstr(t, pattern); | |
940 | if (!t) | |
941 | return -ENOENT; | |
942 | ||
943 | /* Check that pattern occurs in beginning of line. */ | |
944 | pattern_ok = (t == status || t[-1] == '\n'); | |
945 | ||
946 | t += strlen(pattern); | |
947 | ||
948 | } while (!pattern_ok); | |
949 | ||
950 | t += strspn(t, " \t"); | |
951 | if (!*t) | |
952 | return -ENOENT; | |
953 | ||
954 | } while (*t != ':'); | |
955 | ||
956 | t++; | |
69ab8088 | 957 | |
4ec29144 | 958 | if (*t) { |
1e5413f7 ZJS |
959 | t += strspn(t, " \t"); |
960 | ||
961 | /* Also skip zeros, because when this is used for | |
962 | * capabilities, we don't want the zeros. This way the | |
963 | * same capability set always maps to the same string, | |
964 | * irrespective of the total capability set size. For | |
965 | * other numbers it shouldn't matter. */ | |
966 | t += strspn(t, "0"); | |
4ec29144 ZJS |
967 | /* Back off one char if there's nothing but whitespace |
968 | and zeros */ | |
1e5413f7 | 969 | if (!*t || isspace(*t)) |
313cefa1 | 970 | t--; |
4ec29144 | 971 | } |
69ab8088 | 972 | |
c4cd1d4d | 973 | len = strcspn(t, terminator); |
69ab8088 | 974 | |
90110825 LP |
975 | f = strndup(t, len); |
976 | if (!f) | |
69ab8088 ZJS |
977 | return -ENOMEM; |
978 | ||
90110825 | 979 | *field = f; |
69ab8088 ZJS |
980 | return 0; |
981 | } | |
0d39fa9c LP |
982 | |
983 | DIR *xopendirat(int fd, const char *name, int flags) { | |
984 | int nfd; | |
985 | DIR *d; | |
986 | ||
987 | assert(!(flags & O_CREAT)); | |
988 | ||
989 | nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags, 0); | |
990 | if (nfd < 0) | |
991 | return NULL; | |
992 | ||
993 | d = fdopendir(nfd); | |
994 | if (!d) { | |
995 | safe_close(nfd); | |
996 | return NULL; | |
997 | } | |
998 | ||
999 | return d; | |
1000 | } | |
1001 | ||
1002 | static int search_and_fopen_internal(const char *path, const char *mode, const char *root, char **search, FILE **_f) { | |
1003 | char **i; | |
1004 | ||
1005 | assert(path); | |
1006 | assert(mode); | |
1007 | assert(_f); | |
1008 | ||
1009 | if (!path_strv_resolve_uniq(search, root)) | |
1010 | return -ENOMEM; | |
1011 | ||
1012 | STRV_FOREACH(i, search) { | |
1013 | _cleanup_free_ char *p = NULL; | |
1014 | FILE *f; | |
1015 | ||
1016 | if (root) | |
605405c6 | 1017 | p = strjoin(root, *i, "/", path); |
0d39fa9c | 1018 | else |
605405c6 | 1019 | p = strjoin(*i, "/", path); |
0d39fa9c LP |
1020 | if (!p) |
1021 | return -ENOMEM; | |
1022 | ||
1023 | f = fopen(p, mode); | |
1024 | if (f) { | |
1025 | *_f = f; | |
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | if (errno != ENOENT) | |
1030 | return -errno; | |
1031 | } | |
1032 | ||
1033 | return -ENOENT; | |
1034 | } | |
1035 | ||
1036 | int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f) { | |
1037 | _cleanup_strv_free_ char **copy = NULL; | |
1038 | ||
1039 | assert(path); | |
1040 | assert(mode); | |
1041 | assert(_f); | |
1042 | ||
1043 | if (path_is_absolute(path)) { | |
1044 | FILE *f; | |
1045 | ||
1046 | f = fopen(path, mode); | |
1047 | if (f) { | |
1048 | *_f = f; | |
1049 | return 0; | |
1050 | } | |
1051 | ||
1052 | return -errno; | |
1053 | } | |
1054 | ||
1055 | copy = strv_copy((char**) search); | |
1056 | if (!copy) | |
1057 | return -ENOMEM; | |
1058 | ||
1059 | return search_and_fopen_internal(path, mode, root, copy, _f); | |
1060 | } | |
1061 | ||
1062 | int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f) { | |
1063 | _cleanup_strv_free_ char **s = NULL; | |
1064 | ||
1065 | if (path_is_absolute(path)) { | |
1066 | FILE *f; | |
1067 | ||
1068 | f = fopen(path, mode); | |
1069 | if (f) { | |
1070 | *_f = f; | |
1071 | return 0; | |
1072 | } | |
1073 | ||
1074 | return -errno; | |
1075 | } | |
1076 | ||
1077 | s = strv_split_nulstr(search); | |
1078 | if (!s) | |
1079 | return -ENOMEM; | |
1080 | ||
1081 | return search_and_fopen_internal(path, mode, root, s, _f); | |
1082 | } | |
1083 | ||
1084 | int fopen_temporary(const char *path, FILE **_f, char **_temp_path) { | |
1085 | FILE *f; | |
1086 | char *t; | |
1087 | int r, fd; | |
1088 | ||
1089 | assert(path); | |
1090 | assert(_f); | |
1091 | assert(_temp_path); | |
1092 | ||
1093 | r = tempfn_xxxxxx(path, NULL, &t); | |
1094 | if (r < 0) | |
1095 | return r; | |
1096 | ||
646853bd | 1097 | fd = mkostemp_safe(t); |
0d39fa9c LP |
1098 | if (fd < 0) { |
1099 | free(t); | |
1100 | return -errno; | |
1101 | } | |
1102 | ||
1103 | f = fdopen(fd, "we"); | |
1104 | if (!f) { | |
1105 | unlink_noerrno(t); | |
1106 | free(t); | |
1107 | safe_close(fd); | |
1108 | return -errno; | |
1109 | } | |
1110 | ||
1111 | *_f = f; | |
1112 | *_temp_path = t; | |
1113 | ||
1114 | return 0; | |
1115 | } | |
1116 | ||
1117 | int fflush_and_check(FILE *f) { | |
1118 | assert(f); | |
1119 | ||
1120 | errno = 0; | |
1121 | fflush(f); | |
1122 | ||
1123 | if (ferror(f)) | |
f5e5c28f | 1124 | return errno > 0 ? -errno : -EIO; |
0d39fa9c LP |
1125 | |
1126 | return 0; | |
1127 | } | |
1128 | ||
61233823 | 1129 | /* This is much like mkostemp() but is subject to umask(). */ |
646853bd | 1130 | int mkostemp_safe(char *pattern) { |
3587161a | 1131 | _cleanup_umask_ mode_t u = 0; |
0d39fa9c LP |
1132 | int fd; |
1133 | ||
1134 | assert(pattern); | |
1135 | ||
1136 | u = umask(077); | |
1137 | ||
646853bd | 1138 | fd = mkostemp(pattern, O_CLOEXEC); |
0d39fa9c LP |
1139 | if (fd < 0) |
1140 | return -errno; | |
1141 | ||
1142 | return fd; | |
1143 | } | |
1144 | ||
0d39fa9c LP |
1145 | int tempfn_xxxxxx(const char *p, const char *extra, char **ret) { |
1146 | const char *fn; | |
1147 | char *t; | |
1148 | ||
1149 | assert(p); | |
1150 | assert(ret); | |
1151 | ||
1152 | /* | |
1153 | * Turns this: | |
1154 | * /foo/bar/waldo | |
1155 | * | |
1156 | * Into this: | |
1157 | * /foo/bar/.#<extra>waldoXXXXXX | |
1158 | */ | |
1159 | ||
1160 | fn = basename(p); | |
1161 | if (!filename_is_valid(fn)) | |
1162 | return -EINVAL; | |
1163 | ||
1164 | if (extra == NULL) | |
1165 | extra = ""; | |
1166 | ||
1167 | t = new(char, strlen(p) + 2 + strlen(extra) + 6 + 1); | |
1168 | if (!t) | |
1169 | return -ENOMEM; | |
1170 | ||
1171 | strcpy(stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn), "XXXXXX"); | |
1172 | ||
1173 | *ret = path_kill_slashes(t); | |
1174 | return 0; | |
1175 | } | |
1176 | ||
1177 | int tempfn_random(const char *p, const char *extra, char **ret) { | |
1178 | const char *fn; | |
1179 | char *t, *x; | |
1180 | uint64_t u; | |
1181 | unsigned i; | |
1182 | ||
1183 | assert(p); | |
1184 | assert(ret); | |
1185 | ||
1186 | /* | |
1187 | * Turns this: | |
1188 | * /foo/bar/waldo | |
1189 | * | |
1190 | * Into this: | |
1191 | * /foo/bar/.#<extra>waldobaa2a261115984a9 | |
1192 | */ | |
1193 | ||
1194 | fn = basename(p); | |
1195 | if (!filename_is_valid(fn)) | |
1196 | return -EINVAL; | |
1197 | ||
1198 | if (!extra) | |
1199 | extra = ""; | |
1200 | ||
1201 | t = new(char, strlen(p) + 2 + strlen(extra) + 16 + 1); | |
1202 | if (!t) | |
1203 | return -ENOMEM; | |
1204 | ||
1205 | x = stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn); | |
1206 | ||
1207 | u = random_u64(); | |
1208 | for (i = 0; i < 16; i++) { | |
1209 | *(x++) = hexchar(u & 0xF); | |
1210 | u >>= 4; | |
1211 | } | |
1212 | ||
1213 | *x = 0; | |
1214 | ||
1215 | *ret = path_kill_slashes(t); | |
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | int tempfn_random_child(const char *p, const char *extra, char **ret) { | |
1220 | char *t, *x; | |
1221 | uint64_t u; | |
1222 | unsigned i; | |
992e8f22 | 1223 | int r; |
0d39fa9c | 1224 | |
0d39fa9c LP |
1225 | assert(ret); |
1226 | ||
1227 | /* Turns this: | |
1228 | * /foo/bar/waldo | |
1229 | * Into this: | |
1230 | * /foo/bar/waldo/.#<extra>3c2b6219aa75d7d0 | |
1231 | */ | |
1232 | ||
992e8f22 LP |
1233 | if (!p) { |
1234 | r = tmp_dir(&p); | |
1235 | if (r < 0) | |
1236 | return r; | |
1237 | } | |
1238 | ||
0d39fa9c LP |
1239 | if (!extra) |
1240 | extra = ""; | |
1241 | ||
1242 | t = new(char, strlen(p) + 3 + strlen(extra) + 16 + 1); | |
1243 | if (!t) | |
1244 | return -ENOMEM; | |
1245 | ||
1246 | x = stpcpy(stpcpy(stpcpy(t, p), "/.#"), extra); | |
1247 | ||
1248 | u = random_u64(); | |
1249 | for (i = 0; i < 16; i++) { | |
1250 | *(x++) = hexchar(u & 0xF); | |
1251 | u >>= 4; | |
1252 | } | |
1253 | ||
1254 | *x = 0; | |
1255 | ||
1256 | *ret = path_kill_slashes(t); | |
1257 | return 0; | |
1258 | } | |
33d52ab9 LP |
1259 | |
1260 | int write_timestamp_file_atomic(const char *fn, usec_t n) { | |
1261 | char ln[DECIMAL_STR_MAX(n)+2]; | |
1262 | ||
1263 | /* Creates a "timestamp" file, that contains nothing but a | |
1264 | * usec_t timestamp, formatted in ASCII. */ | |
1265 | ||
1266 | if (n <= 0 || n >= USEC_INFINITY) | |
1267 | return -ERANGE; | |
1268 | ||
1269 | xsprintf(ln, USEC_FMT "\n", n); | |
1270 | ||
1271 | return write_string_file(fn, ln, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC); | |
1272 | } | |
1273 | ||
1274 | int read_timestamp_file(const char *fn, usec_t *ret) { | |
1275 | _cleanup_free_ char *ln = NULL; | |
1276 | uint64_t t; | |
1277 | int r; | |
1278 | ||
1279 | r = read_one_line_file(fn, &ln); | |
1280 | if (r < 0) | |
1281 | return r; | |
1282 | ||
1283 | r = safe_atou64(ln, &t); | |
1284 | if (r < 0) | |
1285 | return r; | |
1286 | ||
1287 | if (t <= 0 || t >= (uint64_t) USEC_INFINITY) | |
1288 | return -ERANGE; | |
1289 | ||
1290 | *ret = (usec_t) t; | |
1291 | return 0; | |
1292 | } | |
d390f8ef LP |
1293 | |
1294 | int fputs_with_space(FILE *f, const char *s, const char *separator, bool *space) { | |
1295 | int r; | |
1296 | ||
1297 | assert(s); | |
1298 | ||
1299 | /* Outputs the specified string with fputs(), but optionally prefixes it with a separator. The *space parameter | |
1300 | * when specified shall initially point to a boolean variable initialized to false. It is set to true after the | |
1301 | * first invocation. This call is supposed to be use in loops, where a separator shall be inserted between each | |
1302 | * element, but not before the first one. */ | |
1303 | ||
1304 | if (!f) | |
1305 | f = stdout; | |
1306 | ||
1307 | if (space) { | |
1308 | if (!separator) | |
1309 | separator = " "; | |
1310 | ||
1311 | if (*space) { | |
1312 | r = fputs(separator, f); | |
1313 | if (r < 0) | |
1314 | return r; | |
1315 | } | |
1316 | ||
1317 | *space = true; | |
1318 | } | |
1319 | ||
1320 | return fputs(s, f); | |
1321 | } | |
03532f0a LP |
1322 | |
1323 | int open_tmpfile_unlinkable(const char *directory, int flags) { | |
1324 | char *p; | |
992e8f22 | 1325 | int fd, r; |
03532f0a | 1326 | |
992e8f22 LP |
1327 | if (!directory) { |
1328 | r = tmp_dir(&directory); | |
1329 | if (r < 0) | |
1330 | return r; | |
1331 | } | |
03532f0a LP |
1332 | |
1333 | /* Returns an unlinked temporary file that cannot be linked into the file system anymore */ | |
1334 | ||
03532f0a LP |
1335 | /* Try O_TMPFILE first, if it is supported */ |
1336 | fd = open(directory, flags|O_TMPFILE|O_EXCL, S_IRUSR|S_IWUSR); | |
1337 | if (fd >= 0) | |
1338 | return fd; | |
03532f0a LP |
1339 | |
1340 | /* Fall back to unguessable name + unlinking */ | |
1341 | p = strjoina(directory, "/systemd-tmp-XXXXXX"); | |
1342 | ||
646853bd | 1343 | fd = mkostemp_safe(p); |
03532f0a LP |
1344 | if (fd < 0) |
1345 | return fd; | |
1346 | ||
1347 | (void) unlink(p); | |
1348 | ||
1349 | return fd; | |
1350 | } | |
1351 | ||
1352 | int open_tmpfile_linkable(const char *target, int flags, char **ret_path) { | |
1353 | _cleanup_free_ char *tmp = NULL; | |
1354 | int r, fd; | |
1355 | ||
1356 | assert(target); | |
1357 | assert(ret_path); | |
1358 | ||
1359 | /* Don't allow O_EXCL, as that has a special meaning for O_TMPFILE */ | |
1360 | assert((flags & O_EXCL) == 0); | |
1361 | ||
1362 | /* Creates a temporary file, that shall be renamed to "target" later. If possible, this uses O_TMPFILE – in | |
1363 | * which case "ret_path" will be returned as NULL. If not possible a the tempoary path name used is returned in | |
1364 | * "ret_path". Use link_tmpfile() below to rename the result after writing the file in full. */ | |
1365 | ||
03532f0a LP |
1366 | { |
1367 | _cleanup_free_ char *dn = NULL; | |
1368 | ||
1369 | dn = dirname_malloc(target); | |
1370 | if (!dn) | |
1371 | return -ENOMEM; | |
1372 | ||
1373 | fd = open(dn, O_TMPFILE|flags, 0640); | |
1374 | if (fd >= 0) { | |
1375 | *ret_path = NULL; | |
1376 | return fd; | |
1377 | } | |
1378 | ||
1379 | log_debug_errno(errno, "Failed to use O_TMPFILE on %s: %m", dn); | |
1380 | } | |
03532f0a LP |
1381 | |
1382 | r = tempfn_random(target, NULL, &tmp); | |
1383 | if (r < 0) | |
1384 | return r; | |
1385 | ||
1386 | fd = open(tmp, O_CREAT|O_EXCL|O_NOFOLLOW|O_NOCTTY|flags, 0640); | |
1387 | if (fd < 0) | |
1388 | return -errno; | |
1389 | ||
1390 | *ret_path = tmp; | |
1391 | tmp = NULL; | |
1392 | ||
1393 | return fd; | |
1394 | } | |
1395 | ||
504afd7c ZJS |
1396 | int open_serialization_fd(const char *ident) { |
1397 | int fd = -1; | |
1398 | ||
1399 | fd = memfd_create(ident, MFD_CLOEXEC); | |
1400 | if (fd < 0) { | |
1401 | const char *path; | |
1402 | ||
df0ff127 | 1403 | path = getpid_cached() == 1 ? "/run/systemd" : "/tmp"; |
504afd7c ZJS |
1404 | fd = open_tmpfile_unlinkable(path, O_RDWR|O_CLOEXEC); |
1405 | if (fd < 0) | |
1406 | return fd; | |
1407 | ||
1408 | log_debug("Serializing %s to %s.", ident, path); | |
1409 | } else | |
1410 | log_debug("Serializing %s to memfd.", ident); | |
1411 | ||
1412 | return fd; | |
1413 | } | |
1414 | ||
03532f0a LP |
1415 | int link_tmpfile(int fd, const char *path, const char *target) { |
1416 | ||
1417 | assert(fd >= 0); | |
1418 | assert(target); | |
1419 | ||
1420 | /* Moves a temporary file created with open_tmpfile() above into its final place. if "path" is NULL an fd | |
1421 | * created with O_TMPFILE is assumed, and linkat() is used. Otherwise it is assumed O_TMPFILE is not supported | |
1422 | * on the directory, and renameat2() is used instead. | |
1423 | * | |
f8e2f4d6 | 1424 | * Note that in both cases we will not replace existing files. This is because linkat() does not support this |
03532f0a LP |
1425 | * operation currently (renameat2() does), and there is no nice way to emulate this. */ |
1426 | ||
1427 | if (path) { | |
1428 | if (rename_noreplace(AT_FDCWD, path, AT_FDCWD, target) < 0) | |
1429 | return -errno; | |
1430 | } else { | |
1431 | char proc_fd_path[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(fd) + 1]; | |
1432 | ||
1433 | xsprintf(proc_fd_path, "/proc/self/fd/%i", fd); | |
1434 | ||
1435 | if (linkat(AT_FDCWD, proc_fd_path, AT_FDCWD, target, AT_SYMLINK_FOLLOW) < 0) | |
1436 | return -errno; | |
1437 | } | |
1438 | ||
1439 | return 0; | |
1440 | } | |
03c2b288 LP |
1441 | |
1442 | int read_nul_string(FILE *f, char **ret) { | |
1443 | _cleanup_free_ char *x = NULL; | |
1444 | size_t allocated = 0, n = 0; | |
1445 | ||
1446 | assert(f); | |
1447 | assert(ret); | |
1448 | ||
1449 | /* Reads a NUL-terminated string from the specified file. */ | |
1450 | ||
1451 | for (;;) { | |
1452 | int c; | |
1453 | ||
1454 | if (!GREEDY_REALLOC(x, allocated, n+2)) | |
1455 | return -ENOMEM; | |
1456 | ||
1457 | c = fgetc(f); | |
1458 | if (c == 0) /* Terminate at NUL byte */ | |
1459 | break; | |
1460 | if (c == EOF) { | |
1461 | if (ferror(f)) | |
1462 | return -errno; | |
1463 | break; /* Terminate at EOF */ | |
1464 | } | |
1465 | ||
1466 | x[n++] = (char) c; | |
1467 | } | |
1468 | ||
1469 | if (x) | |
1470 | x[n] = 0; | |
1471 | else { | |
1472 | x = new0(char, 1); | |
1473 | if (!x) | |
1474 | return -ENOMEM; | |
1475 | } | |
1476 | ||
1477 | *ret = x; | |
1478 | x = NULL; | |
1479 | ||
1480 | return 0; | |
1481 | } | |
676bcb0f LP |
1482 | |
1483 | int mkdtemp_malloc(const char *template, char **ret) { | |
1484 | char *p; | |
1485 | ||
1486 | assert(template); | |
1487 | assert(ret); | |
1488 | ||
1489 | p = strdup(template); | |
1490 | if (!p) | |
1491 | return -ENOMEM; | |
1492 | ||
1493 | if (!mkdtemp(p)) { | |
1494 | free(p); | |
1495 | return -errno; | |
1496 | } | |
1497 | ||
1498 | *ret = p; | |
1499 | return 0; | |
1500 | } |