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663996b3 MS |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <assert.h> | |
23 | #include <string.h> | |
24 | #include <unistd.h> | |
25 | #include <errno.h> | |
26 | #include <stdlib.h> | |
27 | #include <signal.h> | |
28 | #include <stdio.h> | |
29 | #include <syslog.h> | |
30 | #include <sched.h> | |
31 | #include <sys/resource.h> | |
32 | #include <linux/sched.h> | |
33 | #include <sys/types.h> | |
34 | #include <sys/stat.h> | |
35 | #include <fcntl.h> | |
36 | #include <dirent.h> | |
37 | #include <sys/ioctl.h> | |
38 | #include <linux/vt.h> | |
39 | #include <linux/tiocl.h> | |
40 | #include <termios.h> | |
41 | #include <stdarg.h> | |
42 | #include <sys/inotify.h> | |
43 | #include <sys/poll.h> | |
663996b3 MS |
44 | #include <ctype.h> |
45 | #include <sys/prctl.h> | |
46 | #include <sys/utsname.h> | |
47 | #include <pwd.h> | |
48 | #include <netinet/ip.h> | |
49 | #include <linux/kd.h> | |
50 | #include <dlfcn.h> | |
51 | #include <sys/wait.h> | |
52 | #include <sys/time.h> | |
53 | #include <glob.h> | |
54 | #include <grp.h> | |
55 | #include <sys/mman.h> | |
56 | #include <sys/vfs.h> | |
60f067b4 | 57 | #include <sys/mount.h> |
663996b3 MS |
58 | #include <linux/magic.h> |
59 | #include <limits.h> | |
60 | #include <langinfo.h> | |
61 | #include <locale.h> | |
60f067b4 | 62 | #include <sys/personality.h> |
663996b3 | 63 | #include <libgen.h> |
60f067b4 JS |
64 | #undef basename |
65 | ||
66 | #ifdef HAVE_SYS_AUXV_H | |
67 | #include <sys/auxv.h> | |
68 | #endif | |
663996b3 MS |
69 | |
70 | #include "macro.h" | |
71 | #include "util.h" | |
72 | #include "ioprio.h" | |
73 | #include "missing.h" | |
74 | #include "log.h" | |
75 | #include "strv.h" | |
76 | #include "label.h" | |
60f067b4 | 77 | #include "mkdir.h" |
663996b3 MS |
78 | #include "path-util.h" |
79 | #include "exit-status.h" | |
80 | #include "hashmap.h" | |
81 | #include "env-util.h" | |
82 | #include "fileio.h" | |
14228c0d | 83 | #include "device-nodes.h" |
60f067b4 JS |
84 | #include "utf8.h" |
85 | #include "gunicode.h" | |
86 | #include "virt.h" | |
87 | #include "def.h" | |
663996b3 MS |
88 | |
89 | int saved_argc = 0; | |
90 | char **saved_argv = NULL; | |
91 | ||
92 | static volatile unsigned cached_columns = 0; | |
93 | static volatile unsigned cached_lines = 0; | |
94 | ||
95 | size_t page_size(void) { | |
60f067b4 | 96 | static thread_local size_t pgsz = 0; |
663996b3 MS |
97 | long r; |
98 | ||
99 | if (_likely_(pgsz > 0)) | |
100 | return pgsz; | |
101 | ||
102 | r = sysconf(_SC_PAGESIZE); | |
103 | assert(r > 0); | |
104 | ||
105 | pgsz = (size_t) r; | |
106 | return pgsz; | |
107 | } | |
108 | ||
109 | bool streq_ptr(const char *a, const char *b) { | |
110 | ||
111 | /* Like streq(), but tries to make sense of NULL pointers */ | |
112 | ||
113 | if (a && b) | |
114 | return streq(a, b); | |
115 | ||
116 | if (!a && !b) | |
117 | return true; | |
118 | ||
119 | return false; | |
120 | } | |
121 | ||
122 | char* endswith(const char *s, const char *postfix) { | |
123 | size_t sl, pl; | |
124 | ||
125 | assert(s); | |
126 | assert(postfix); | |
127 | ||
128 | sl = strlen(s); | |
129 | pl = strlen(postfix); | |
130 | ||
131 | if (pl == 0) | |
132 | return (char*) s + sl; | |
133 | ||
134 | if (sl < pl) | |
135 | return NULL; | |
136 | ||
137 | if (memcmp(s + sl - pl, postfix, pl) != 0) | |
138 | return NULL; | |
139 | ||
140 | return (char*) s + sl - pl; | |
141 | } | |
142 | ||
5eef597e | 143 | char* first_word(const char *s, const char *word) { |
663996b3 | 144 | size_t sl, wl; |
5eef597e | 145 | const char *p; |
663996b3 MS |
146 | |
147 | assert(s); | |
148 | assert(word); | |
149 | ||
5eef597e MP |
150 | /* Checks if the string starts with the specified word, either |
151 | * followed by NUL or by whitespace. Returns a pointer to the | |
152 | * NUL or the first character after the whitespace. */ | |
153 | ||
663996b3 MS |
154 | sl = strlen(s); |
155 | wl = strlen(word); | |
156 | ||
157 | if (sl < wl) | |
5eef597e | 158 | return NULL; |
663996b3 MS |
159 | |
160 | if (wl == 0) | |
5eef597e | 161 | return (char*) s; |
663996b3 MS |
162 | |
163 | if (memcmp(s, word, wl) != 0) | |
5eef597e MP |
164 | return NULL; |
165 | ||
166 | p = s + wl; | |
167 | if (*p == 0) | |
168 | return (char*) p; | |
169 | ||
170 | if (!strchr(WHITESPACE, *p)) | |
171 | return NULL; | |
663996b3 | 172 | |
5eef597e MP |
173 | p += strspn(p, WHITESPACE); |
174 | return (char*) p; | |
663996b3 MS |
175 | } |
176 | ||
177 | int close_nointr(int fd) { | |
663996b3 | 178 | assert(fd >= 0); |
5eef597e MP |
179 | |
180 | if (close(fd) >= 0) | |
60f067b4 | 181 | return 0; |
5eef597e MP |
182 | |
183 | /* | |
184 | * Just ignore EINTR; a retry loop is the wrong thing to do on | |
185 | * Linux. | |
186 | * | |
187 | * http://lkml.indiana.edu/hypermail/linux/kernel/0509.1/0877.html | |
188 | * https://bugzilla.gnome.org/show_bug.cgi?id=682819 | |
189 | * http://utcc.utoronto.ca/~cks/space/blog/unix/CloseEINTR | |
190 | * https://sites.google.com/site/michaelsafyan/software-engineering/checkforeintrwheninvokingclosethinkagain | |
191 | */ | |
192 | if (errno == EINTR) | |
193 | return 0; | |
194 | ||
195 | return -errno; | |
663996b3 MS |
196 | } |
197 | ||
60f067b4 JS |
198 | int safe_close(int fd) { |
199 | ||
200 | /* | |
201 | * Like close_nointr() but cannot fail. Guarantees errno is | |
202 | * unchanged. Is a NOP with negative fds passed, and returns | |
203 | * -1, so that it can be used in this syntax: | |
204 | * | |
205 | * fd = safe_close(fd); | |
206 | */ | |
207 | ||
208 | if (fd >= 0) { | |
209 | PROTECT_ERRNO; | |
210 | ||
211 | /* The kernel might return pretty much any error code | |
212 | * via close(), but the fd will be closed anyway. The | |
213 | * only condition we want to check for here is whether | |
214 | * the fd was invalid at all... */ | |
663996b3 | 215 | |
60f067b4 JS |
216 | assert_se(close_nointr(fd) != -EBADF); |
217 | } | |
663996b3 | 218 | |
60f067b4 | 219 | return -1; |
663996b3 MS |
220 | } |
221 | ||
222 | void close_many(const int fds[], unsigned n_fd) { | |
223 | unsigned i; | |
224 | ||
225 | assert(fds || n_fd <= 0); | |
226 | ||
227 | for (i = 0; i < n_fd; i++) | |
60f067b4 | 228 | safe_close(fds[i]); |
663996b3 MS |
229 | } |
230 | ||
231 | int unlink_noerrno(const char *path) { | |
232 | PROTECT_ERRNO; | |
233 | int r; | |
234 | ||
235 | r = unlink(path); | |
236 | if (r < 0) | |
237 | return -errno; | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | int parse_boolean(const char *v) { | |
243 | assert(v); | |
244 | ||
5eef597e | 245 | if (streq(v, "1") || strcaseeq(v, "yes") || strcaseeq(v, "y") || strcaseeq(v, "true") || strcaseeq(v, "t") || strcaseeq(v, "on")) |
663996b3 | 246 | return 1; |
5eef597e | 247 | else if (streq(v, "0") || strcaseeq(v, "no") || strcaseeq(v, "n") || strcaseeq(v, "false") || strcaseeq(v, "f") || strcaseeq(v, "off")) |
663996b3 MS |
248 | return 0; |
249 | ||
250 | return -EINVAL; | |
251 | } | |
252 | ||
253 | int parse_pid(const char *s, pid_t* ret_pid) { | |
254 | unsigned long ul = 0; | |
255 | pid_t pid; | |
256 | int r; | |
257 | ||
258 | assert(s); | |
259 | assert(ret_pid); | |
260 | ||
261 | r = safe_atolu(s, &ul); | |
262 | if (r < 0) | |
263 | return r; | |
264 | ||
265 | pid = (pid_t) ul; | |
266 | ||
267 | if ((unsigned long) pid != ul) | |
268 | return -ERANGE; | |
269 | ||
270 | if (pid <= 0) | |
271 | return -ERANGE; | |
272 | ||
273 | *ret_pid = pid; | |
274 | return 0; | |
275 | } | |
276 | ||
277 | int parse_uid(const char *s, uid_t* ret_uid) { | |
278 | unsigned long ul = 0; | |
279 | uid_t uid; | |
280 | int r; | |
281 | ||
282 | assert(s); | |
283 | assert(ret_uid); | |
284 | ||
285 | r = safe_atolu(s, &ul); | |
286 | if (r < 0) | |
287 | return r; | |
288 | ||
289 | uid = (uid_t) ul; | |
290 | ||
291 | if ((unsigned long) uid != ul) | |
292 | return -ERANGE; | |
293 | ||
e842803a MB |
294 | /* Some libc APIs use (uid_t) -1 as special placeholder */ |
295 | if (uid == (uid_t) 0xFFFFFFFF) | |
296 | return -ENXIO; | |
297 | ||
298 | /* A long time ago UIDs where 16bit, hence explicitly avoid the 16bit -1 too */ | |
299 | if (uid == (uid_t) 0xFFFF) | |
300 | return -ENXIO; | |
301 | ||
663996b3 MS |
302 | *ret_uid = uid; |
303 | return 0; | |
304 | } | |
305 | ||
306 | int safe_atou(const char *s, unsigned *ret_u) { | |
307 | char *x = NULL; | |
308 | unsigned long l; | |
309 | ||
310 | assert(s); | |
311 | assert(ret_u); | |
312 | ||
313 | errno = 0; | |
314 | l = strtoul(s, &x, 0); | |
315 | ||
316 | if (!x || x == s || *x || errno) | |
317 | return errno > 0 ? -errno : -EINVAL; | |
318 | ||
319 | if ((unsigned long) (unsigned) l != l) | |
320 | return -ERANGE; | |
321 | ||
322 | *ret_u = (unsigned) l; | |
323 | return 0; | |
324 | } | |
325 | ||
326 | int safe_atoi(const char *s, int *ret_i) { | |
327 | char *x = NULL; | |
328 | long l; | |
329 | ||
330 | assert(s); | |
331 | assert(ret_i); | |
332 | ||
333 | errno = 0; | |
334 | l = strtol(s, &x, 0); | |
335 | ||
336 | if (!x || x == s || *x || errno) | |
337 | return errno > 0 ? -errno : -EINVAL; | |
338 | ||
339 | if ((long) (int) l != l) | |
340 | return -ERANGE; | |
341 | ||
342 | *ret_i = (int) l; | |
343 | return 0; | |
344 | } | |
345 | ||
5eef597e MP |
346 | int safe_atou8(const char *s, uint8_t *ret) { |
347 | char *x = NULL; | |
348 | unsigned long l; | |
349 | ||
350 | assert(s); | |
351 | assert(ret); | |
352 | ||
353 | errno = 0; | |
354 | l = strtoul(s, &x, 0); | |
355 | ||
356 | if (!x || x == s || *x || errno) | |
357 | return errno > 0 ? -errno : -EINVAL; | |
358 | ||
359 | if ((unsigned long) (uint8_t) l != l) | |
360 | return -ERANGE; | |
361 | ||
362 | *ret = (uint8_t) l; | |
363 | return 0; | |
364 | } | |
365 | ||
663996b3 MS |
366 | int safe_atollu(const char *s, long long unsigned *ret_llu) { |
367 | char *x = NULL; | |
368 | unsigned long long l; | |
369 | ||
370 | assert(s); | |
371 | assert(ret_llu); | |
372 | ||
373 | errno = 0; | |
374 | l = strtoull(s, &x, 0); | |
375 | ||
376 | if (!x || x == s || *x || errno) | |
377 | return errno ? -errno : -EINVAL; | |
378 | ||
379 | *ret_llu = l; | |
380 | return 0; | |
381 | } | |
382 | ||
383 | int safe_atolli(const char *s, long long int *ret_lli) { | |
384 | char *x = NULL; | |
385 | long long l; | |
386 | ||
387 | assert(s); | |
388 | assert(ret_lli); | |
389 | ||
390 | errno = 0; | |
391 | l = strtoll(s, &x, 0); | |
392 | ||
393 | if (!x || x == s || *x || errno) | |
394 | return errno ? -errno : -EINVAL; | |
395 | ||
396 | *ret_lli = l; | |
397 | return 0; | |
398 | } | |
399 | ||
400 | int safe_atod(const char *s, double *ret_d) { | |
401 | char *x = NULL; | |
14228c0d | 402 | double d = 0; |
663996b3 MS |
403 | |
404 | assert(s); | |
405 | assert(ret_d); | |
406 | ||
407 | RUN_WITH_LOCALE(LC_NUMERIC_MASK, "C") { | |
408 | errno = 0; | |
409 | d = strtod(s, &x); | |
410 | } | |
411 | ||
412 | if (!x || x == s || *x || errno) | |
413 | return errno ? -errno : -EINVAL; | |
414 | ||
415 | *ret_d = (double) d; | |
416 | return 0; | |
417 | } | |
418 | ||
60f067b4 JS |
419 | static size_t strcspn_escaped(const char *s, const char *reject) { |
420 | bool escaped = false; | |
421 | size_t n; | |
422 | ||
423 | for (n=0; s[n]; n++) { | |
424 | if (escaped) | |
425 | escaped = false; | |
426 | else if (s[n] == '\\') | |
427 | escaped = true; | |
428 | else if (strchr(reject, s[n])) | |
5eef597e | 429 | break; |
60f067b4 | 430 | } |
5eef597e MP |
431 | /* if s ends in \, return index of previous char */ |
432 | return n - escaped; | |
60f067b4 JS |
433 | } |
434 | ||
663996b3 | 435 | /* Split a string into words. */ |
5eef597e MP |
436 | const char* split(const char **state, size_t *l, const char *separator, bool quoted) { |
437 | const char *current; | |
663996b3 | 438 | |
5eef597e | 439 | current = *state; |
663996b3 | 440 | |
5eef597e MP |
441 | if (!*current) { |
442 | assert(**state == '\0'); | |
663996b3 | 443 | return NULL; |
5eef597e | 444 | } |
663996b3 MS |
445 | |
446 | current += strspn(current, separator); | |
5eef597e MP |
447 | if (!*current) { |
448 | *state = current; | |
663996b3 | 449 | return NULL; |
5eef597e | 450 | } |
663996b3 | 451 | |
60f067b4 | 452 | if (quoted && strchr("\'\"", *current)) { |
5eef597e MP |
453 | char quotechars[2] = {*current, '\0'}; |
454 | ||
455 | *l = strcspn_escaped(current + 1, quotechars); | |
456 | if (current[*l + 1] == '\0' || | |
457 | (current[*l + 2] && !strchr(separator, current[*l + 2]))) { | |
458 | /* right quote missing or garbage at the end*/ | |
459 | *state = current; | |
460 | return NULL; | |
461 | } | |
462 | assert(current[*l + 1] == quotechars[0]); | |
463 | *state = current++ + *l + 2; | |
60f067b4 JS |
464 | } else if (quoted) { |
465 | *l = strcspn_escaped(current, separator); | |
5eef597e | 466 | *state = current + *l; |
663996b3 | 467 | } else { |
60f067b4 | 468 | *l = strcspn(current, separator); |
5eef597e | 469 | *state = current + *l; |
663996b3 MS |
470 | } |
471 | ||
5eef597e | 472 | return current; |
663996b3 MS |
473 | } |
474 | ||
475 | int get_parent_of_pid(pid_t pid, pid_t *_ppid) { | |
476 | int r; | |
60f067b4 | 477 | _cleanup_free_ char *line = NULL; |
663996b3 MS |
478 | long unsigned ppid; |
479 | const char *p; | |
480 | ||
481 | assert(pid >= 0); | |
482 | assert(_ppid); | |
483 | ||
484 | if (pid == 0) { | |
485 | *_ppid = getppid(); | |
486 | return 0; | |
487 | } | |
488 | ||
489 | p = procfs_file_alloca(pid, "stat"); | |
60f067b4 JS |
490 | r = read_one_line_file(p, &line); |
491 | if (r < 0) | |
663996b3 | 492 | return r; |
663996b3 MS |
493 | |
494 | /* Let's skip the pid and comm fields. The latter is enclosed | |
495 | * in () but does not escape any () in its value, so let's | |
496 | * skip over it manually */ | |
497 | ||
498 | p = strrchr(line, ')'); | |
499 | if (!p) | |
500 | return -EIO; | |
501 | ||
502 | p++; | |
503 | ||
504 | if (sscanf(p, " " | |
505 | "%*c " /* state */ | |
506 | "%lu ", /* ppid */ | |
507 | &ppid) != 1) | |
508 | return -EIO; | |
509 | ||
510 | if ((long unsigned) (pid_t) ppid != ppid) | |
511 | return -ERANGE; | |
512 | ||
513 | *_ppid = (pid_t) ppid; | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | int get_starttime_of_pid(pid_t pid, unsigned long long *st) { | |
60f067b4 JS |
519 | int r; |
520 | _cleanup_free_ char *line = NULL; | |
663996b3 MS |
521 | const char *p; |
522 | ||
523 | assert(pid >= 0); | |
524 | assert(st); | |
525 | ||
60f067b4 JS |
526 | p = procfs_file_alloca(pid, "stat"); |
527 | r = read_one_line_file(p, &line); | |
528 | if (r < 0) | |
529 | return r; | |
663996b3 MS |
530 | |
531 | /* Let's skip the pid and comm fields. The latter is enclosed | |
532 | * in () but does not escape any () in its value, so let's | |
533 | * skip over it manually */ | |
534 | ||
535 | p = strrchr(line, ')'); | |
536 | if (!p) | |
537 | return -EIO; | |
538 | ||
539 | p++; | |
540 | ||
541 | if (sscanf(p, " " | |
542 | "%*c " /* state */ | |
543 | "%*d " /* ppid */ | |
544 | "%*d " /* pgrp */ | |
545 | "%*d " /* session */ | |
546 | "%*d " /* tty_nr */ | |
547 | "%*d " /* tpgid */ | |
548 | "%*u " /* flags */ | |
549 | "%*u " /* minflt */ | |
550 | "%*u " /* cminflt */ | |
551 | "%*u " /* majflt */ | |
552 | "%*u " /* cmajflt */ | |
553 | "%*u " /* utime */ | |
554 | "%*u " /* stime */ | |
555 | "%*d " /* cutime */ | |
556 | "%*d " /* cstime */ | |
557 | "%*d " /* priority */ | |
558 | "%*d " /* nice */ | |
559 | "%*d " /* num_threads */ | |
560 | "%*d " /* itrealvalue */ | |
561 | "%llu " /* starttime */, | |
562 | st) != 1) | |
563 | return -EIO; | |
564 | ||
565 | return 0; | |
566 | } | |
567 | ||
568 | int fchmod_umask(int fd, mode_t m) { | |
569 | mode_t u; | |
570 | int r; | |
571 | ||
572 | u = umask(0777); | |
573 | r = fchmod(fd, m & (~u)) < 0 ? -errno : 0; | |
574 | umask(u); | |
575 | ||
576 | return r; | |
577 | } | |
578 | ||
579 | char *truncate_nl(char *s) { | |
580 | assert(s); | |
581 | ||
582 | s[strcspn(s, NEWLINE)] = 0; | |
583 | return s; | |
584 | } | |
585 | ||
60f067b4 JS |
586 | int get_process_state(pid_t pid) { |
587 | const char *p; | |
588 | char state; | |
589 | int r; | |
590 | _cleanup_free_ char *line = NULL; | |
591 | ||
592 | assert(pid >= 0); | |
593 | ||
594 | p = procfs_file_alloca(pid, "stat"); | |
595 | r = read_one_line_file(p, &line); | |
596 | if (r < 0) | |
597 | return r; | |
598 | ||
599 | p = strrchr(line, ')'); | |
600 | if (!p) | |
601 | return -EIO; | |
602 | ||
603 | p++; | |
604 | ||
605 | if (sscanf(p, " %c", &state) != 1) | |
606 | return -EIO; | |
607 | ||
608 | return (unsigned char) state; | |
609 | } | |
610 | ||
663996b3 MS |
611 | int get_process_comm(pid_t pid, char **name) { |
612 | const char *p; | |
60f067b4 | 613 | int r; |
663996b3 MS |
614 | |
615 | assert(name); | |
616 | assert(pid >= 0); | |
617 | ||
60f067b4 JS |
618 | p = procfs_file_alloca(pid, "comm"); |
619 | ||
620 | r = read_one_line_file(p, name); | |
621 | if (r == -ENOENT) | |
622 | return -ESRCH; | |
663996b3 | 623 | |
60f067b4 | 624 | return r; |
663996b3 MS |
625 | } |
626 | ||
627 | int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) { | |
628 | _cleanup_fclose_ FILE *f = NULL; | |
629 | char *r = NULL, *k; | |
630 | const char *p; | |
631 | int c; | |
632 | ||
633 | assert(line); | |
634 | assert(pid >= 0); | |
635 | ||
60f067b4 | 636 | p = procfs_file_alloca(pid, "cmdline"); |
663996b3 MS |
637 | |
638 | f = fopen(p, "re"); | |
639 | if (!f) | |
640 | return -errno; | |
641 | ||
642 | if (max_length == 0) { | |
643 | size_t len = 0, allocated = 0; | |
644 | ||
645 | while ((c = getc(f)) != EOF) { | |
646 | ||
647 | if (!GREEDY_REALLOC(r, allocated, len+2)) { | |
648 | free(r); | |
649 | return -ENOMEM; | |
650 | } | |
651 | ||
652 | r[len++] = isprint(c) ? c : ' '; | |
653 | } | |
654 | ||
655 | if (len > 0) | |
656 | r[len-1] = 0; | |
657 | ||
658 | } else { | |
659 | bool space = false; | |
660 | size_t left; | |
661 | ||
662 | r = new(char, max_length); | |
663 | if (!r) | |
664 | return -ENOMEM; | |
665 | ||
666 | k = r; | |
667 | left = max_length; | |
668 | while ((c = getc(f)) != EOF) { | |
669 | ||
670 | if (isprint(c)) { | |
671 | if (space) { | |
672 | if (left <= 4) | |
673 | break; | |
674 | ||
675 | *(k++) = ' '; | |
676 | left--; | |
677 | space = false; | |
678 | } | |
679 | ||
680 | if (left <= 4) | |
681 | break; | |
682 | ||
683 | *(k++) = (char) c; | |
684 | left--; | |
685 | } else | |
686 | space = true; | |
687 | } | |
688 | ||
689 | if (left <= 4) { | |
690 | size_t n = MIN(left-1, 3U); | |
691 | memcpy(k, "...", n); | |
692 | k[n] = 0; | |
693 | } else | |
694 | *k = 0; | |
695 | } | |
696 | ||
697 | /* Kernel threads have no argv[] */ | |
698 | if (r == NULL || r[0] == 0) { | |
60f067b4 | 699 | _cleanup_free_ char *t = NULL; |
663996b3 MS |
700 | int h; |
701 | ||
702 | free(r); | |
703 | ||
704 | if (!comm_fallback) | |
705 | return -ENOENT; | |
706 | ||
707 | h = get_process_comm(pid, &t); | |
708 | if (h < 0) | |
709 | return h; | |
710 | ||
711 | r = strjoin("[", t, "]", NULL); | |
663996b3 MS |
712 | if (!r) |
713 | return -ENOMEM; | |
714 | } | |
715 | ||
716 | *line = r; | |
717 | return 0; | |
718 | } | |
719 | ||
720 | int is_kernel_thread(pid_t pid) { | |
721 | const char *p; | |
722 | size_t count; | |
723 | char c; | |
724 | bool eof; | |
725 | FILE *f; | |
726 | ||
727 | if (pid == 0) | |
728 | return 0; | |
729 | ||
730 | assert(pid > 0); | |
731 | ||
732 | p = procfs_file_alloca(pid, "cmdline"); | |
733 | f = fopen(p, "re"); | |
734 | if (!f) | |
735 | return -errno; | |
736 | ||
737 | count = fread(&c, 1, 1, f); | |
738 | eof = feof(f); | |
739 | fclose(f); | |
740 | ||
741 | /* Kernel threads have an empty cmdline */ | |
742 | ||
743 | if (count <= 0) | |
744 | return eof ? 1 : -errno; | |
745 | ||
746 | return 0; | |
747 | } | |
748 | ||
14228c0d MB |
749 | int get_process_capeff(pid_t pid, char **capeff) { |
750 | const char *p; | |
751 | ||
752 | assert(capeff); | |
753 | assert(pid >= 0); | |
754 | ||
60f067b4 | 755 | p = procfs_file_alloca(pid, "status"); |
14228c0d MB |
756 | |
757 | return get_status_field(p, "\nCapEff:", capeff); | |
758 | } | |
663996b3 MS |
759 | |
760 | int get_process_exe(pid_t pid, char **name) { | |
761 | const char *p; | |
14228c0d MB |
762 | char *d; |
763 | int r; | |
663996b3 MS |
764 | |
765 | assert(pid >= 0); | |
766 | assert(name); | |
767 | ||
60f067b4 | 768 | p = procfs_file_alloca(pid, "exe"); |
663996b3 | 769 | |
14228c0d MB |
770 | r = readlink_malloc(p, name); |
771 | if (r < 0) | |
60f067b4 | 772 | return r == -ENOENT ? -ESRCH : r; |
14228c0d MB |
773 | |
774 | d = endswith(*name, " (deleted)"); | |
775 | if (d) | |
776 | *d = '\0'; | |
777 | ||
778 | return 0; | |
663996b3 MS |
779 | } |
780 | ||
781 | static int get_process_id(pid_t pid, const char *field, uid_t *uid) { | |
782 | _cleanup_fclose_ FILE *f = NULL; | |
783 | char line[LINE_MAX]; | |
784 | const char *p; | |
785 | ||
786 | assert(field); | |
787 | assert(uid); | |
788 | ||
789 | if (pid == 0) | |
790 | return getuid(); | |
791 | ||
792 | p = procfs_file_alloca(pid, "status"); | |
793 | f = fopen(p, "re"); | |
794 | if (!f) | |
795 | return -errno; | |
796 | ||
797 | FOREACH_LINE(line, f, return -errno) { | |
798 | char *l; | |
799 | ||
800 | l = strstrip(line); | |
801 | ||
802 | if (startswith(l, field)) { | |
803 | l += strlen(field); | |
804 | l += strspn(l, WHITESPACE); | |
805 | ||
806 | l[strcspn(l, WHITESPACE)] = 0; | |
807 | ||
808 | return parse_uid(l, uid); | |
809 | } | |
810 | } | |
811 | ||
812 | return -EIO; | |
813 | } | |
814 | ||
815 | int get_process_uid(pid_t pid, uid_t *uid) { | |
816 | return get_process_id(pid, "Uid:", uid); | |
817 | } | |
818 | ||
819 | int get_process_gid(pid_t pid, gid_t *gid) { | |
820 | assert_cc(sizeof(uid_t) == sizeof(gid_t)); | |
821 | return get_process_id(pid, "Gid:", gid); | |
822 | } | |
823 | ||
824 | char *strnappend(const char *s, const char *suffix, size_t b) { | |
825 | size_t a; | |
826 | char *r; | |
827 | ||
828 | if (!s && !suffix) | |
829 | return strdup(""); | |
830 | ||
831 | if (!s) | |
832 | return strndup(suffix, b); | |
833 | ||
834 | if (!suffix) | |
835 | return strdup(s); | |
836 | ||
837 | assert(s); | |
838 | assert(suffix); | |
839 | ||
840 | a = strlen(s); | |
841 | if (b > ((size_t) -1) - a) | |
842 | return NULL; | |
843 | ||
844 | r = new(char, a+b+1); | |
845 | if (!r) | |
846 | return NULL; | |
847 | ||
848 | memcpy(r, s, a); | |
849 | memcpy(r+a, suffix, b); | |
850 | r[a+b] = 0; | |
851 | ||
852 | return r; | |
853 | } | |
854 | ||
855 | char *strappend(const char *s, const char *suffix) { | |
856 | return strnappend(s, suffix, suffix ? strlen(suffix) : 0); | |
857 | } | |
858 | ||
60f067b4 | 859 | int readlinkat_malloc(int fd, const char *p, char **ret) { |
663996b3 | 860 | size_t l = 100; |
60f067b4 | 861 | int r; |
663996b3 MS |
862 | |
863 | assert(p); | |
60f067b4 | 864 | assert(ret); |
663996b3 MS |
865 | |
866 | for (;;) { | |
867 | char *c; | |
868 | ssize_t n; | |
869 | ||
60f067b4 JS |
870 | c = new(char, l); |
871 | if (!c) | |
663996b3 MS |
872 | return -ENOMEM; |
873 | ||
60f067b4 JS |
874 | n = readlinkat(fd, p, c, l-1); |
875 | if (n < 0) { | |
876 | r = -errno; | |
663996b3 | 877 | free(c); |
60f067b4 | 878 | return r; |
663996b3 MS |
879 | } |
880 | ||
881 | if ((size_t) n < l-1) { | |
882 | c[n] = 0; | |
60f067b4 | 883 | *ret = c; |
663996b3 MS |
884 | return 0; |
885 | } | |
886 | ||
887 | free(c); | |
888 | l *= 2; | |
889 | } | |
890 | } | |
891 | ||
60f067b4 JS |
892 | int readlink_malloc(const char *p, char **ret) { |
893 | return readlinkat_malloc(AT_FDCWD, p, ret); | |
894 | } | |
895 | ||
663996b3 | 896 | int readlink_and_make_absolute(const char *p, char **r) { |
14228c0d MB |
897 | _cleanup_free_ char *target = NULL; |
898 | char *k; | |
663996b3 MS |
899 | int j; |
900 | ||
901 | assert(p); | |
902 | assert(r); | |
903 | ||
14228c0d MB |
904 | j = readlink_malloc(p, &target); |
905 | if (j < 0) | |
663996b3 MS |
906 | return j; |
907 | ||
908 | k = file_in_same_dir(p, target); | |
663996b3 MS |
909 | if (!k) |
910 | return -ENOMEM; | |
911 | ||
912 | *r = k; | |
913 | return 0; | |
914 | } | |
915 | ||
916 | int readlink_and_canonicalize(const char *p, char **r) { | |
917 | char *t, *s; | |
918 | int j; | |
919 | ||
920 | assert(p); | |
921 | assert(r); | |
922 | ||
923 | j = readlink_and_make_absolute(p, &t); | |
924 | if (j < 0) | |
925 | return j; | |
926 | ||
927 | s = canonicalize_file_name(t); | |
928 | if (s) { | |
929 | free(t); | |
930 | *r = s; | |
931 | } else | |
932 | *r = t; | |
933 | ||
934 | path_kill_slashes(*r); | |
935 | ||
936 | return 0; | |
937 | } | |
938 | ||
939 | int reset_all_signal_handlers(void) { | |
5eef597e | 940 | int sig, r = 0; |
663996b3 MS |
941 | |
942 | for (sig = 1; sig < _NSIG; sig++) { | |
943 | struct sigaction sa = { | |
944 | .sa_handler = SIG_DFL, | |
945 | .sa_flags = SA_RESTART, | |
946 | }; | |
947 | ||
5eef597e | 948 | /* These two cannot be caught... */ |
663996b3 MS |
949 | if (sig == SIGKILL || sig == SIGSTOP) |
950 | continue; | |
951 | ||
952 | /* On Linux the first two RT signals are reserved by | |
953 | * glibc, and sigaction() will return EINVAL for them. */ | |
954 | if ((sigaction(sig, &sa, NULL) < 0)) | |
5eef597e MP |
955 | if (errno != EINVAL && r == 0) |
956 | r = -errno; | |
663996b3 MS |
957 | } |
958 | ||
5eef597e MP |
959 | return r; |
960 | } | |
961 | ||
962 | int reset_signal_mask(void) { | |
963 | sigset_t ss; | |
964 | ||
965 | if (sigemptyset(&ss) < 0) | |
966 | return -errno; | |
967 | ||
968 | if (sigprocmask(SIG_SETMASK, &ss, NULL) < 0) | |
969 | return -errno; | |
970 | ||
663996b3 MS |
971 | return 0; |
972 | } | |
973 | ||
974 | char *strstrip(char *s) { | |
975 | char *e; | |
976 | ||
977 | /* Drops trailing whitespace. Modifies the string in | |
978 | * place. Returns pointer to first non-space character */ | |
979 | ||
980 | s += strspn(s, WHITESPACE); | |
981 | ||
982 | for (e = strchr(s, 0); e > s; e --) | |
983 | if (!strchr(WHITESPACE, e[-1])) | |
984 | break; | |
985 | ||
986 | *e = 0; | |
987 | ||
988 | return s; | |
989 | } | |
990 | ||
991 | char *delete_chars(char *s, const char *bad) { | |
992 | char *f, *t; | |
993 | ||
994 | /* Drops all whitespace, regardless where in the string */ | |
995 | ||
996 | for (f = s, t = s; *f; f++) { | |
997 | if (strchr(bad, *f)) | |
998 | continue; | |
999 | ||
1000 | *(t++) = *f; | |
1001 | } | |
1002 | ||
1003 | *t = 0; | |
1004 | ||
1005 | return s; | |
1006 | } | |
1007 | ||
663996b3 MS |
1008 | char *file_in_same_dir(const char *path, const char *filename) { |
1009 | char *e, *r; | |
1010 | size_t k; | |
1011 | ||
1012 | assert(path); | |
1013 | assert(filename); | |
1014 | ||
1015 | /* This removes the last component of path and appends | |
1016 | * filename, unless the latter is absolute anyway or the | |
1017 | * former isn't */ | |
1018 | ||
1019 | if (path_is_absolute(filename)) | |
1020 | return strdup(filename); | |
1021 | ||
1022 | if (!(e = strrchr(path, '/'))) | |
1023 | return strdup(filename); | |
1024 | ||
1025 | k = strlen(filename); | |
1026 | if (!(r = new(char, e-path+1+k+1))) | |
1027 | return NULL; | |
1028 | ||
1029 | memcpy(r, path, e-path+1); | |
1030 | memcpy(r+(e-path)+1, filename, k+1); | |
1031 | ||
1032 | return r; | |
1033 | } | |
1034 | ||
1035 | int rmdir_parents(const char *path, const char *stop) { | |
1036 | size_t l; | |
1037 | int r = 0; | |
1038 | ||
1039 | assert(path); | |
1040 | assert(stop); | |
1041 | ||
1042 | l = strlen(path); | |
1043 | ||
1044 | /* Skip trailing slashes */ | |
1045 | while (l > 0 && path[l-1] == '/') | |
1046 | l--; | |
1047 | ||
1048 | while (l > 0) { | |
1049 | char *t; | |
1050 | ||
1051 | /* Skip last component */ | |
1052 | while (l > 0 && path[l-1] != '/') | |
1053 | l--; | |
1054 | ||
1055 | /* Skip trailing slashes */ | |
1056 | while (l > 0 && path[l-1] == '/') | |
1057 | l--; | |
1058 | ||
1059 | if (l <= 0) | |
1060 | break; | |
1061 | ||
1062 | if (!(t = strndup(path, l))) | |
1063 | return -ENOMEM; | |
1064 | ||
1065 | if (path_startswith(stop, t)) { | |
1066 | free(t); | |
1067 | return 0; | |
1068 | } | |
1069 | ||
1070 | r = rmdir(t); | |
1071 | free(t); | |
1072 | ||
1073 | if (r < 0) | |
1074 | if (errno != ENOENT) | |
1075 | return -errno; | |
1076 | } | |
1077 | ||
1078 | return 0; | |
1079 | } | |
1080 | ||
1081 | char hexchar(int x) { | |
1082 | static const char table[16] = "0123456789abcdef"; | |
1083 | ||
1084 | return table[x & 15]; | |
1085 | } | |
1086 | ||
1087 | int unhexchar(char c) { | |
1088 | ||
1089 | if (c >= '0' && c <= '9') | |
1090 | return c - '0'; | |
1091 | ||
1092 | if (c >= 'a' && c <= 'f') | |
1093 | return c - 'a' + 10; | |
1094 | ||
1095 | if (c >= 'A' && c <= 'F') | |
1096 | return c - 'A' + 10; | |
1097 | ||
5eef597e | 1098 | return -EINVAL; |
663996b3 MS |
1099 | } |
1100 | ||
1101 | char *hexmem(const void *p, size_t l) { | |
1102 | char *r, *z; | |
1103 | const uint8_t *x; | |
1104 | ||
1105 | z = r = malloc(l * 2 + 1); | |
1106 | if (!r) | |
1107 | return NULL; | |
1108 | ||
1109 | for (x = p; x < (const uint8_t*) p + l; x++) { | |
1110 | *(z++) = hexchar(*x >> 4); | |
1111 | *(z++) = hexchar(*x & 15); | |
1112 | } | |
1113 | ||
1114 | *z = 0; | |
1115 | return r; | |
1116 | } | |
1117 | ||
1118 | void *unhexmem(const char *p, size_t l) { | |
1119 | uint8_t *r, *z; | |
1120 | const char *x; | |
1121 | ||
1122 | assert(p); | |
1123 | ||
1124 | z = r = malloc((l + 1) / 2 + 1); | |
1125 | if (!r) | |
1126 | return NULL; | |
1127 | ||
1128 | for (x = p; x < p + l; x += 2) { | |
1129 | int a, b; | |
1130 | ||
1131 | a = unhexchar(x[0]); | |
1132 | if (x+1 < p + l) | |
1133 | b = unhexchar(x[1]); | |
1134 | else | |
1135 | b = 0; | |
1136 | ||
1137 | *(z++) = (uint8_t) a << 4 | (uint8_t) b; | |
1138 | } | |
1139 | ||
1140 | *z = 0; | |
1141 | return r; | |
1142 | } | |
1143 | ||
1144 | char octchar(int x) { | |
1145 | return '0' + (x & 7); | |
1146 | } | |
1147 | ||
1148 | int unoctchar(char c) { | |
1149 | ||
1150 | if (c >= '0' && c <= '7') | |
1151 | return c - '0'; | |
1152 | ||
5eef597e | 1153 | return -EINVAL; |
663996b3 MS |
1154 | } |
1155 | ||
1156 | char decchar(int x) { | |
1157 | return '0' + (x % 10); | |
1158 | } | |
1159 | ||
1160 | int undecchar(char c) { | |
1161 | ||
1162 | if (c >= '0' && c <= '9') | |
1163 | return c - '0'; | |
1164 | ||
5eef597e | 1165 | return -EINVAL; |
663996b3 MS |
1166 | } |
1167 | ||
1168 | char *cescape(const char *s) { | |
1169 | char *r, *t; | |
1170 | const char *f; | |
1171 | ||
1172 | assert(s); | |
1173 | ||
1174 | /* Does C style string escaping. */ | |
1175 | ||
1176 | r = new(char, strlen(s)*4 + 1); | |
1177 | if (!r) | |
1178 | return NULL; | |
1179 | ||
1180 | for (f = s, t = r; *f; f++) | |
1181 | ||
1182 | switch (*f) { | |
1183 | ||
1184 | case '\a': | |
1185 | *(t++) = '\\'; | |
1186 | *(t++) = 'a'; | |
1187 | break; | |
1188 | case '\b': | |
1189 | *(t++) = '\\'; | |
1190 | *(t++) = 'b'; | |
1191 | break; | |
1192 | case '\f': | |
1193 | *(t++) = '\\'; | |
1194 | *(t++) = 'f'; | |
1195 | break; | |
1196 | case '\n': | |
1197 | *(t++) = '\\'; | |
1198 | *(t++) = 'n'; | |
1199 | break; | |
1200 | case '\r': | |
1201 | *(t++) = '\\'; | |
1202 | *(t++) = 'r'; | |
1203 | break; | |
1204 | case '\t': | |
1205 | *(t++) = '\\'; | |
1206 | *(t++) = 't'; | |
1207 | break; | |
1208 | case '\v': | |
1209 | *(t++) = '\\'; | |
1210 | *(t++) = 'v'; | |
1211 | break; | |
1212 | case '\\': | |
1213 | *(t++) = '\\'; | |
1214 | *(t++) = '\\'; | |
1215 | break; | |
1216 | case '"': | |
1217 | *(t++) = '\\'; | |
1218 | *(t++) = '"'; | |
1219 | break; | |
1220 | case '\'': | |
1221 | *(t++) = '\\'; | |
1222 | *(t++) = '\''; | |
1223 | break; | |
1224 | ||
1225 | default: | |
1226 | /* For special chars we prefer octal over | |
1227 | * hexadecimal encoding, simply because glib's | |
1228 | * g_strescape() does the same */ | |
1229 | if ((*f < ' ') || (*f >= 127)) { | |
1230 | *(t++) = '\\'; | |
1231 | *(t++) = octchar((unsigned char) *f >> 6); | |
1232 | *(t++) = octchar((unsigned char) *f >> 3); | |
1233 | *(t++) = octchar((unsigned char) *f); | |
1234 | } else | |
1235 | *(t++) = *f; | |
1236 | break; | |
1237 | } | |
1238 | ||
1239 | *t = 0; | |
1240 | ||
1241 | return r; | |
1242 | } | |
1243 | ||
1244 | char *cunescape_length_with_prefix(const char *s, size_t length, const char *prefix) { | |
1245 | char *r, *t; | |
1246 | const char *f; | |
1247 | size_t pl; | |
1248 | ||
1249 | assert(s); | |
1250 | ||
1251 | /* Undoes C style string escaping, and optionally prefixes it. */ | |
1252 | ||
1253 | pl = prefix ? strlen(prefix) : 0; | |
1254 | ||
1255 | r = new(char, pl+length+1); | |
1256 | if (!r) | |
5eef597e | 1257 | return NULL; |
663996b3 MS |
1258 | |
1259 | if (prefix) | |
1260 | memcpy(r, prefix, pl); | |
1261 | ||
1262 | for (f = s, t = r + pl; f < s + length; f++) { | |
1263 | ||
1264 | if (*f != '\\') { | |
1265 | *(t++) = *f; | |
1266 | continue; | |
1267 | } | |
1268 | ||
1269 | f++; | |
1270 | ||
1271 | switch (*f) { | |
1272 | ||
1273 | case 'a': | |
1274 | *(t++) = '\a'; | |
1275 | break; | |
1276 | case 'b': | |
1277 | *(t++) = '\b'; | |
1278 | break; | |
1279 | case 'f': | |
1280 | *(t++) = '\f'; | |
1281 | break; | |
1282 | case 'n': | |
1283 | *(t++) = '\n'; | |
1284 | break; | |
1285 | case 'r': | |
1286 | *(t++) = '\r'; | |
1287 | break; | |
1288 | case 't': | |
1289 | *(t++) = '\t'; | |
1290 | break; | |
1291 | case 'v': | |
1292 | *(t++) = '\v'; | |
1293 | break; | |
1294 | case '\\': | |
1295 | *(t++) = '\\'; | |
1296 | break; | |
1297 | case '"': | |
1298 | *(t++) = '"'; | |
1299 | break; | |
1300 | case '\'': | |
1301 | *(t++) = '\''; | |
1302 | break; | |
1303 | ||
1304 | case 's': | |
1305 | /* This is an extension of the XDG syntax files */ | |
1306 | *(t++) = ' '; | |
1307 | break; | |
1308 | ||
1309 | case 'x': { | |
1310 | /* hexadecimal encoding */ | |
1311 | int a, b; | |
1312 | ||
1313 | a = unhexchar(f[1]); | |
1314 | b = unhexchar(f[2]); | |
1315 | ||
e842803a | 1316 | if (a < 0 || b < 0 || (a == 0 && b == 0)) { |
663996b3 MS |
1317 | /* Invalid escape code, let's take it literal then */ |
1318 | *(t++) = '\\'; | |
1319 | *(t++) = 'x'; | |
1320 | } else { | |
1321 | *(t++) = (char) ((a << 4) | b); | |
1322 | f += 2; | |
1323 | } | |
1324 | ||
1325 | break; | |
1326 | } | |
1327 | ||
1328 | case '0': | |
1329 | case '1': | |
1330 | case '2': | |
1331 | case '3': | |
1332 | case '4': | |
1333 | case '5': | |
1334 | case '6': | |
1335 | case '7': { | |
1336 | /* octal encoding */ | |
1337 | int a, b, c; | |
1338 | ||
1339 | a = unoctchar(f[0]); | |
1340 | b = unoctchar(f[1]); | |
1341 | c = unoctchar(f[2]); | |
1342 | ||
e842803a | 1343 | if (a < 0 || b < 0 || c < 0 || (a == 0 && b == 0 && c == 0)) { |
663996b3 MS |
1344 | /* Invalid escape code, let's take it literal then */ |
1345 | *(t++) = '\\'; | |
1346 | *(t++) = f[0]; | |
1347 | } else { | |
1348 | *(t++) = (char) ((a << 6) | (b << 3) | c); | |
1349 | f += 2; | |
1350 | } | |
1351 | ||
1352 | break; | |
1353 | } | |
1354 | ||
1355 | case 0: | |
1356 | /* premature end of string.*/ | |
1357 | *(t++) = '\\'; | |
1358 | goto finish; | |
1359 | ||
1360 | default: | |
1361 | /* Invalid escape code, let's take it literal then */ | |
1362 | *(t++) = '\\'; | |
1363 | *(t++) = *f; | |
1364 | break; | |
1365 | } | |
1366 | } | |
1367 | ||
1368 | finish: | |
1369 | *t = 0; | |
1370 | return r; | |
1371 | } | |
1372 | ||
1373 | char *cunescape_length(const char *s, size_t length) { | |
1374 | return cunescape_length_with_prefix(s, length, NULL); | |
1375 | } | |
1376 | ||
1377 | char *cunescape(const char *s) { | |
1378 | assert(s); | |
1379 | ||
1380 | return cunescape_length(s, strlen(s)); | |
1381 | } | |
1382 | ||
1383 | char *xescape(const char *s, const char *bad) { | |
1384 | char *r, *t; | |
1385 | const char *f; | |
1386 | ||
1387 | /* Escapes all chars in bad, in addition to \ and all special | |
1388 | * chars, in \xFF style escaping. May be reversed with | |
1389 | * cunescape. */ | |
1390 | ||
1391 | r = new(char, strlen(s) * 4 + 1); | |
1392 | if (!r) | |
1393 | return NULL; | |
1394 | ||
1395 | for (f = s, t = r; *f; f++) { | |
1396 | ||
1397 | if ((*f < ' ') || (*f >= 127) || | |
1398 | (*f == '\\') || strchr(bad, *f)) { | |
1399 | *(t++) = '\\'; | |
1400 | *(t++) = 'x'; | |
1401 | *(t++) = hexchar(*f >> 4); | |
1402 | *(t++) = hexchar(*f); | |
1403 | } else | |
1404 | *(t++) = *f; | |
1405 | } | |
1406 | ||
1407 | *t = 0; | |
1408 | ||
1409 | return r; | |
1410 | } | |
1411 | ||
663996b3 MS |
1412 | char *ascii_strlower(char *t) { |
1413 | char *p; | |
1414 | ||
1415 | assert(t); | |
1416 | ||
1417 | for (p = t; *p; p++) | |
1418 | if (*p >= 'A' && *p <= 'Z') | |
1419 | *p = *p - 'A' + 'a'; | |
1420 | ||
1421 | return t; | |
1422 | } | |
1423 | ||
1424 | _pure_ static bool ignore_file_allow_backup(const char *filename) { | |
1425 | assert(filename); | |
1426 | ||
1427 | return | |
1428 | filename[0] == '.' || | |
1429 | streq(filename, "lost+found") || | |
1430 | streq(filename, "aquota.user") || | |
1431 | streq(filename, "aquota.group") || | |
1432 | endswith(filename, ".rpmnew") || | |
1433 | endswith(filename, ".rpmsave") || | |
1434 | endswith(filename, ".rpmorig") || | |
1435 | endswith(filename, ".dpkg-old") || | |
1436 | endswith(filename, ".dpkg-new") || | |
5eef597e | 1437 | endswith(filename, ".dpkg-tmp") || |
663996b3 MS |
1438 | endswith(filename, ".swp"); |
1439 | } | |
1440 | ||
1441 | bool ignore_file(const char *filename) { | |
1442 | assert(filename); | |
1443 | ||
1444 | if (endswith(filename, "~")) | |
60f067b4 | 1445 | return true; |
663996b3 MS |
1446 | |
1447 | return ignore_file_allow_backup(filename); | |
1448 | } | |
1449 | ||
1450 | int fd_nonblock(int fd, bool nonblock) { | |
60f067b4 | 1451 | int flags, nflags; |
663996b3 MS |
1452 | |
1453 | assert(fd >= 0); | |
1454 | ||
60f067b4 JS |
1455 | flags = fcntl(fd, F_GETFL, 0); |
1456 | if (flags < 0) | |
663996b3 MS |
1457 | return -errno; |
1458 | ||
1459 | if (nonblock) | |
60f067b4 | 1460 | nflags = flags | O_NONBLOCK; |
663996b3 | 1461 | else |
60f067b4 JS |
1462 | nflags = flags & ~O_NONBLOCK; |
1463 | ||
1464 | if (nflags == flags) | |
1465 | return 0; | |
663996b3 | 1466 | |
60f067b4 | 1467 | if (fcntl(fd, F_SETFL, nflags) < 0) |
663996b3 MS |
1468 | return -errno; |
1469 | ||
1470 | return 0; | |
1471 | } | |
1472 | ||
1473 | int fd_cloexec(int fd, bool cloexec) { | |
60f067b4 | 1474 | int flags, nflags; |
663996b3 MS |
1475 | |
1476 | assert(fd >= 0); | |
1477 | ||
60f067b4 JS |
1478 | flags = fcntl(fd, F_GETFD, 0); |
1479 | if (flags < 0) | |
663996b3 MS |
1480 | return -errno; |
1481 | ||
1482 | if (cloexec) | |
60f067b4 | 1483 | nflags = flags | FD_CLOEXEC; |
663996b3 | 1484 | else |
60f067b4 JS |
1485 | nflags = flags & ~FD_CLOEXEC; |
1486 | ||
1487 | if (nflags == flags) | |
1488 | return 0; | |
663996b3 | 1489 | |
60f067b4 | 1490 | if (fcntl(fd, F_SETFD, nflags) < 0) |
663996b3 MS |
1491 | return -errno; |
1492 | ||
1493 | return 0; | |
1494 | } | |
1495 | ||
1496 | _pure_ static bool fd_in_set(int fd, const int fdset[], unsigned n_fdset) { | |
1497 | unsigned i; | |
1498 | ||
1499 | assert(n_fdset == 0 || fdset); | |
1500 | ||
1501 | for (i = 0; i < n_fdset; i++) | |
1502 | if (fdset[i] == fd) | |
1503 | return true; | |
1504 | ||
1505 | return false; | |
1506 | } | |
1507 | ||
1508 | int close_all_fds(const int except[], unsigned n_except) { | |
e842803a | 1509 | _cleanup_closedir_ DIR *d = NULL; |
663996b3 MS |
1510 | struct dirent *de; |
1511 | int r = 0; | |
1512 | ||
1513 | assert(n_except == 0 || except); | |
1514 | ||
1515 | d = opendir("/proc/self/fd"); | |
1516 | if (!d) { | |
1517 | int fd; | |
1518 | struct rlimit rl; | |
1519 | ||
1520 | /* When /proc isn't available (for example in chroots) | |
1521 | * the fallback is brute forcing through the fd | |
1522 | * table */ | |
1523 | ||
1524 | assert_se(getrlimit(RLIMIT_NOFILE, &rl) >= 0); | |
1525 | for (fd = 3; fd < (int) rl.rlim_max; fd ++) { | |
1526 | ||
1527 | if (fd_in_set(fd, except, n_except)) | |
1528 | continue; | |
1529 | ||
1530 | if (close_nointr(fd) < 0) | |
1531 | if (errno != EBADF && r == 0) | |
1532 | r = -errno; | |
1533 | } | |
1534 | ||
1535 | return r; | |
1536 | } | |
1537 | ||
1538 | while ((de = readdir(d))) { | |
1539 | int fd = -1; | |
1540 | ||
1541 | if (ignore_file(de->d_name)) | |
1542 | continue; | |
1543 | ||
1544 | if (safe_atoi(de->d_name, &fd) < 0) | |
1545 | /* Let's better ignore this, just in case */ | |
1546 | continue; | |
1547 | ||
1548 | if (fd < 3) | |
1549 | continue; | |
1550 | ||
1551 | if (fd == dirfd(d)) | |
1552 | continue; | |
1553 | ||
1554 | if (fd_in_set(fd, except, n_except)) | |
1555 | continue; | |
1556 | ||
1557 | if (close_nointr(fd) < 0) { | |
1558 | /* Valgrind has its own FD and doesn't want to have it closed */ | |
1559 | if (errno != EBADF && r == 0) | |
1560 | r = -errno; | |
1561 | } | |
1562 | } | |
1563 | ||
663996b3 MS |
1564 | return r; |
1565 | } | |
1566 | ||
1567 | bool chars_intersect(const char *a, const char *b) { | |
1568 | const char *p; | |
1569 | ||
1570 | /* Returns true if any of the chars in a are in b. */ | |
1571 | for (p = a; *p; p++) | |
1572 | if (strchr(b, *p)) | |
1573 | return true; | |
1574 | ||
1575 | return false; | |
1576 | } | |
1577 | ||
1578 | bool fstype_is_network(const char *fstype) { | |
1579 | static const char table[] = | |
1580 | "cifs\0" | |
1581 | "smbfs\0" | |
e842803a | 1582 | "sshfs\0" |
663996b3 | 1583 | "ncpfs\0" |
14228c0d | 1584 | "ncp\0" |
663996b3 MS |
1585 | "nfs\0" |
1586 | "nfs4\0" | |
1587 | "gfs\0" | |
60f067b4 JS |
1588 | "gfs2\0" |
1589 | "glusterfs\0"; | |
1590 | ||
1591 | const char *x; | |
1592 | ||
1593 | x = startswith(fstype, "fuse."); | |
1594 | if (x) | |
1595 | fstype = x; | |
663996b3 MS |
1596 | |
1597 | return nulstr_contains(table, fstype); | |
1598 | } | |
1599 | ||
1600 | int chvt(int vt) { | |
1601 | _cleanup_close_ int fd; | |
1602 | ||
1603 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1604 | if (fd < 0) | |
1605 | return -errno; | |
1606 | ||
1607 | if (vt < 0) { | |
1608 | int tiocl[2] = { | |
1609 | TIOCL_GETKMSGREDIRECT, | |
1610 | 0 | |
1611 | }; | |
1612 | ||
1613 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
1614 | return -errno; | |
1615 | ||
1616 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
1617 | } | |
1618 | ||
1619 | if (ioctl(fd, VT_ACTIVATE, vt) < 0) | |
1620 | return -errno; | |
1621 | ||
1622 | return 0; | |
1623 | } | |
1624 | ||
1625 | int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { | |
1626 | struct termios old_termios, new_termios; | |
e842803a | 1627 | char c, line[LINE_MAX]; |
663996b3 MS |
1628 | |
1629 | assert(f); | |
1630 | assert(ret); | |
1631 | ||
1632 | if (tcgetattr(fileno(f), &old_termios) >= 0) { | |
1633 | new_termios = old_termios; | |
1634 | ||
1635 | new_termios.c_lflag &= ~ICANON; | |
1636 | new_termios.c_cc[VMIN] = 1; | |
1637 | new_termios.c_cc[VTIME] = 0; | |
1638 | ||
1639 | if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) { | |
1640 | size_t k; | |
1641 | ||
5eef597e | 1642 | if (t != USEC_INFINITY) { |
663996b3 MS |
1643 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) { |
1644 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
1645 | return -ETIMEDOUT; | |
1646 | } | |
1647 | } | |
1648 | ||
1649 | k = fread(&c, 1, 1, f); | |
1650 | ||
1651 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
1652 | ||
1653 | if (k <= 0) | |
1654 | return -EIO; | |
1655 | ||
1656 | if (need_nl) | |
1657 | *need_nl = c != '\n'; | |
1658 | ||
1659 | *ret = c; | |
1660 | return 0; | |
1661 | } | |
1662 | } | |
1663 | ||
5eef597e | 1664 | if (t != USEC_INFINITY) { |
663996b3 MS |
1665 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) |
1666 | return -ETIMEDOUT; | |
e842803a | 1667 | } |
663996b3 | 1668 | |
5eef597e | 1669 | errno = 0; |
663996b3 | 1670 | if (!fgets(line, sizeof(line), f)) |
5eef597e | 1671 | return errno ? -errno : -EIO; |
663996b3 MS |
1672 | |
1673 | truncate_nl(line); | |
1674 | ||
1675 | if (strlen(line) != 1) | |
1676 | return -EBADMSG; | |
1677 | ||
1678 | if (need_nl) | |
1679 | *need_nl = false; | |
1680 | ||
1681 | *ret = line[0]; | |
1682 | return 0; | |
1683 | } | |
1684 | ||
5eef597e | 1685 | int ask_char(char *ret, const char *replies, const char *text, ...) { |
e842803a | 1686 | int r; |
663996b3 MS |
1687 | |
1688 | assert(ret); | |
1689 | assert(replies); | |
1690 | assert(text); | |
1691 | ||
1692 | for (;;) { | |
1693 | va_list ap; | |
1694 | char c; | |
663996b3 MS |
1695 | bool need_nl = true; |
1696 | ||
1697 | if (on_tty()) | |
1698 | fputs(ANSI_HIGHLIGHT_ON, stdout); | |
1699 | ||
1700 | va_start(ap, text); | |
1701 | vprintf(text, ap); | |
1702 | va_end(ap); | |
1703 | ||
1704 | if (on_tty()) | |
1705 | fputs(ANSI_HIGHLIGHT_OFF, stdout); | |
1706 | ||
1707 | fflush(stdout); | |
1708 | ||
5eef597e | 1709 | r = read_one_char(stdin, &c, USEC_INFINITY, &need_nl); |
663996b3 MS |
1710 | if (r < 0) { |
1711 | ||
1712 | if (r == -EBADMSG) { | |
1713 | puts("Bad input, please try again."); | |
1714 | continue; | |
1715 | } | |
1716 | ||
1717 | putchar('\n'); | |
1718 | return r; | |
1719 | } | |
1720 | ||
1721 | if (need_nl) | |
1722 | putchar('\n'); | |
1723 | ||
1724 | if (strchr(replies, c)) { | |
1725 | *ret = c; | |
1726 | return 0; | |
1727 | } | |
1728 | ||
1729 | puts("Read unexpected character, please try again."); | |
1730 | } | |
1731 | } | |
1732 | ||
5eef597e MP |
1733 | int ask_string(char **ret, const char *text, ...) { |
1734 | assert(ret); | |
1735 | assert(text); | |
1736 | ||
1737 | for (;;) { | |
1738 | char line[LINE_MAX]; | |
1739 | va_list ap; | |
1740 | ||
1741 | if (on_tty()) | |
1742 | fputs(ANSI_HIGHLIGHT_ON, stdout); | |
1743 | ||
1744 | va_start(ap, text); | |
1745 | vprintf(text, ap); | |
1746 | va_end(ap); | |
1747 | ||
1748 | if (on_tty()) | |
1749 | fputs(ANSI_HIGHLIGHT_OFF, stdout); | |
1750 | ||
1751 | fflush(stdout); | |
1752 | ||
1753 | errno = 0; | |
1754 | if (!fgets(line, sizeof(line), stdin)) | |
1755 | return errno ? -errno : -EIO; | |
1756 | ||
1757 | if (!endswith(line, "\n")) | |
1758 | putchar('\n'); | |
1759 | else { | |
1760 | char *s; | |
1761 | ||
1762 | if (isempty(line)) | |
1763 | continue; | |
1764 | ||
1765 | truncate_nl(line); | |
1766 | s = strdup(line); | |
1767 | if (!s) | |
1768 | return -ENOMEM; | |
1769 | ||
1770 | *ret = s; | |
1771 | return 0; | |
1772 | } | |
1773 | } | |
1774 | } | |
1775 | ||
663996b3 MS |
1776 | int reset_terminal_fd(int fd, bool switch_to_text) { |
1777 | struct termios termios; | |
1778 | int r = 0; | |
1779 | ||
1780 | /* Set terminal to some sane defaults */ | |
1781 | ||
1782 | assert(fd >= 0); | |
1783 | ||
1784 | /* We leave locked terminal attributes untouched, so that | |
1785 | * Plymouth may set whatever it wants to set, and we don't | |
1786 | * interfere with that. */ | |
1787 | ||
1788 | /* Disable exclusive mode, just in case */ | |
1789 | ioctl(fd, TIOCNXCL); | |
1790 | ||
1791 | /* Switch to text mode */ | |
1792 | if (switch_to_text) | |
1793 | ioctl(fd, KDSETMODE, KD_TEXT); | |
1794 | ||
1795 | /* Enable console unicode mode */ | |
1796 | ioctl(fd, KDSKBMODE, K_UNICODE); | |
1797 | ||
1798 | if (tcgetattr(fd, &termios) < 0) { | |
1799 | r = -errno; | |
1800 | goto finish; | |
1801 | } | |
1802 | ||
1803 | /* We only reset the stuff that matters to the software. How | |
1804 | * hardware is set up we don't touch assuming that somebody | |
1805 | * else will do that for us */ | |
1806 | ||
1807 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
1808 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
1809 | termios.c_oflag |= ONLCR; | |
1810 | termios.c_cflag |= CREAD; | |
1811 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
1812 | ||
1813 | termios.c_cc[VINTR] = 03; /* ^C */ | |
1814 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
1815 | termios.c_cc[VERASE] = 0177; | |
1816 | termios.c_cc[VKILL] = 025; /* ^X */ | |
1817 | termios.c_cc[VEOF] = 04; /* ^D */ | |
1818 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
1819 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
1820 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
1821 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
1822 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
1823 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
1824 | termios.c_cc[VEOL] = 0; | |
1825 | termios.c_cc[VEOL2] = 0; | |
1826 | ||
1827 | termios.c_cc[VTIME] = 0; | |
1828 | termios.c_cc[VMIN] = 1; | |
1829 | ||
1830 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
1831 | r = -errno; | |
1832 | ||
1833 | finish: | |
1834 | /* Just in case, flush all crap out */ | |
1835 | tcflush(fd, TCIOFLUSH); | |
1836 | ||
1837 | return r; | |
1838 | } | |
1839 | ||
1840 | int reset_terminal(const char *name) { | |
60f067b4 | 1841 | _cleanup_close_ int fd = -1; |
663996b3 MS |
1842 | |
1843 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1844 | if (fd < 0) | |
1845 | return fd; | |
1846 | ||
60f067b4 | 1847 | return reset_terminal_fd(fd, true); |
663996b3 MS |
1848 | } |
1849 | ||
1850 | int open_terminal(const char *name, int mode) { | |
1851 | int fd, r; | |
1852 | unsigned c = 0; | |
1853 | ||
1854 | /* | |
1855 | * If a TTY is in the process of being closed opening it might | |
1856 | * cause EIO. This is horribly awful, but unlikely to be | |
1857 | * changed in the kernel. Hence we work around this problem by | |
1858 | * retrying a couple of times. | |
1859 | * | |
1860 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
1861 | */ | |
1862 | ||
14228c0d MB |
1863 | assert(!(mode & O_CREAT)); |
1864 | ||
663996b3 | 1865 | for (;;) { |
14228c0d | 1866 | fd = open(name, mode, 0); |
663996b3 MS |
1867 | if (fd >= 0) |
1868 | break; | |
1869 | ||
1870 | if (errno != EIO) | |
1871 | return -errno; | |
1872 | ||
1873 | /* Max 1s in total */ | |
1874 | if (c >= 20) | |
1875 | return -errno; | |
1876 | ||
1877 | usleep(50 * USEC_PER_MSEC); | |
1878 | c++; | |
1879 | } | |
1880 | ||
663996b3 MS |
1881 | r = isatty(fd); |
1882 | if (r < 0) { | |
60f067b4 | 1883 | safe_close(fd); |
663996b3 MS |
1884 | return -errno; |
1885 | } | |
1886 | ||
1887 | if (!r) { | |
60f067b4 | 1888 | safe_close(fd); |
663996b3 MS |
1889 | return -ENOTTY; |
1890 | } | |
1891 | ||
1892 | return fd; | |
1893 | } | |
1894 | ||
1895 | int flush_fd(int fd) { | |
1896 | struct pollfd pollfd = { | |
1897 | .fd = fd, | |
1898 | .events = POLLIN, | |
1899 | }; | |
1900 | ||
1901 | for (;;) { | |
1902 | char buf[LINE_MAX]; | |
1903 | ssize_t l; | |
1904 | int r; | |
1905 | ||
1906 | r = poll(&pollfd, 1, 0); | |
1907 | if (r < 0) { | |
1908 | if (errno == EINTR) | |
1909 | continue; | |
1910 | ||
1911 | return -errno; | |
1912 | ||
1913 | } else if (r == 0) | |
1914 | return 0; | |
1915 | ||
1916 | l = read(fd, buf, sizeof(buf)); | |
1917 | if (l < 0) { | |
1918 | ||
1919 | if (errno == EINTR) | |
1920 | continue; | |
1921 | ||
1922 | if (errno == EAGAIN) | |
1923 | return 0; | |
1924 | ||
1925 | return -errno; | |
1926 | } else if (l == 0) | |
1927 | return 0; | |
1928 | } | |
1929 | } | |
1930 | ||
1931 | int acquire_terminal( | |
1932 | const char *name, | |
1933 | bool fail, | |
1934 | bool force, | |
1935 | bool ignore_tiocstty_eperm, | |
1936 | usec_t timeout) { | |
1937 | ||
1938 | int fd = -1, notify = -1, r = 0, wd = -1; | |
1939 | usec_t ts = 0; | |
1940 | ||
1941 | assert(name); | |
1942 | ||
1943 | /* We use inotify to be notified when the tty is closed. We | |
1944 | * create the watch before checking if we can actually acquire | |
1945 | * it, so that we don't lose any event. | |
1946 | * | |
1947 | * Note: strictly speaking this actually watches for the | |
1948 | * device being closed, it does *not* really watch whether a | |
1949 | * tty loses its controlling process. However, unless some | |
1950 | * rogue process uses TIOCNOTTY on /dev/tty *after* closing | |
1951 | * its tty otherwise this will not become a problem. As long | |
1952 | * as the administrator makes sure not configure any service | |
1953 | * on the same tty as an untrusted user this should not be a | |
1954 | * problem. (Which he probably should not do anyway.) */ | |
1955 | ||
5eef597e | 1956 | if (timeout != USEC_INFINITY) |
663996b3 MS |
1957 | ts = now(CLOCK_MONOTONIC); |
1958 | ||
1959 | if (!fail && !force) { | |
5eef597e | 1960 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); |
663996b3 MS |
1961 | if (notify < 0) { |
1962 | r = -errno; | |
1963 | goto fail; | |
1964 | } | |
1965 | ||
1966 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
1967 | if (wd < 0) { | |
1968 | r = -errno; | |
1969 | goto fail; | |
1970 | } | |
1971 | } | |
1972 | ||
1973 | for (;;) { | |
1974 | struct sigaction sa_old, sa_new = { | |
1975 | .sa_handler = SIG_IGN, | |
1976 | .sa_flags = SA_RESTART, | |
1977 | }; | |
1978 | ||
1979 | if (notify >= 0) { | |
1980 | r = flush_fd(notify); | |
1981 | if (r < 0) | |
1982 | goto fail; | |
1983 | } | |
1984 | ||
1985 | /* We pass here O_NOCTTY only so that we can check the return | |
1986 | * value TIOCSCTTY and have a reliable way to figure out if we | |
1987 | * successfully became the controlling process of the tty */ | |
1988 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
1989 | if (fd < 0) | |
1990 | return fd; | |
1991 | ||
1992 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
1993 | * if we already own the tty. */ | |
1994 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
1995 | ||
1996 | /* First, try to get the tty */ | |
1997 | if (ioctl(fd, TIOCSCTTY, force) < 0) | |
1998 | r = -errno; | |
1999 | ||
2000 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
2001 | ||
2002 | /* Sometimes it makes sense to ignore TIOCSCTTY | |
2003 | * returning EPERM, i.e. when very likely we already | |
2004 | * are have this controlling terminal. */ | |
2005 | if (r < 0 && r == -EPERM && ignore_tiocstty_eperm) | |
2006 | r = 0; | |
2007 | ||
2008 | if (r < 0 && (force || fail || r != -EPERM)) { | |
2009 | goto fail; | |
2010 | } | |
2011 | ||
2012 | if (r >= 0) | |
2013 | break; | |
2014 | ||
2015 | assert(!fail); | |
2016 | assert(!force); | |
2017 | assert(notify >= 0); | |
2018 | ||
2019 | for (;;) { | |
2020 | uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX]; | |
2021 | ssize_t l; | |
2022 | struct inotify_event *e; | |
2023 | ||
5eef597e | 2024 | if (timeout != USEC_INFINITY) { |
663996b3 MS |
2025 | usec_t n; |
2026 | ||
2027 | n = now(CLOCK_MONOTONIC); | |
2028 | if (ts + timeout < n) { | |
2029 | r = -ETIMEDOUT; | |
2030 | goto fail; | |
2031 | } | |
2032 | ||
2033 | r = fd_wait_for_event(fd, POLLIN, ts + timeout - n); | |
2034 | if (r < 0) | |
2035 | goto fail; | |
2036 | ||
2037 | if (r == 0) { | |
2038 | r = -ETIMEDOUT; | |
2039 | goto fail; | |
2040 | } | |
2041 | } | |
2042 | ||
2043 | l = read(notify, inotify_buffer, sizeof(inotify_buffer)); | |
2044 | if (l < 0) { | |
2045 | ||
2046 | if (errno == EINTR || errno == EAGAIN) | |
2047 | continue; | |
2048 | ||
2049 | r = -errno; | |
2050 | goto fail; | |
2051 | } | |
2052 | ||
2053 | e = (struct inotify_event*) inotify_buffer; | |
2054 | ||
2055 | while (l > 0) { | |
2056 | size_t step; | |
2057 | ||
2058 | if (e->wd != wd || !(e->mask & IN_CLOSE)) { | |
2059 | r = -EIO; | |
2060 | goto fail; | |
2061 | } | |
2062 | ||
2063 | step = sizeof(struct inotify_event) + e->len; | |
2064 | assert(step <= (size_t) l); | |
2065 | ||
2066 | e = (struct inotify_event*) ((uint8_t*) e + step); | |
2067 | l -= step; | |
2068 | } | |
2069 | ||
2070 | break; | |
2071 | } | |
2072 | ||
2073 | /* We close the tty fd here since if the old session | |
2074 | * ended our handle will be dead. It's important that | |
2075 | * we do this after sleeping, so that we don't enter | |
2076 | * an endless loop. */ | |
5eef597e | 2077 | fd = safe_close(fd); |
663996b3 MS |
2078 | } |
2079 | ||
60f067b4 | 2080 | safe_close(notify); |
663996b3 MS |
2081 | |
2082 | r = reset_terminal_fd(fd, true); | |
2083 | if (r < 0) | |
2084 | log_warning("Failed to reset terminal: %s", strerror(-r)); | |
2085 | ||
2086 | return fd; | |
2087 | ||
2088 | fail: | |
60f067b4 JS |
2089 | safe_close(fd); |
2090 | safe_close(notify); | |
663996b3 MS |
2091 | |
2092 | return r; | |
2093 | } | |
2094 | ||
2095 | int release_terminal(void) { | |
5eef597e | 2096 | static const struct sigaction sa_new = { |
663996b3 MS |
2097 | .sa_handler = SIG_IGN, |
2098 | .sa_flags = SA_RESTART, | |
2099 | }; | |
5eef597e MP |
2100 | |
2101 | _cleanup_close_ int fd = -1; | |
2102 | struct sigaction sa_old; | |
2103 | int r = 0; | |
663996b3 MS |
2104 | |
2105 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC); | |
2106 | if (fd < 0) | |
2107 | return -errno; | |
2108 | ||
2109 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
2110 | * by our own TIOCNOTTY */ | |
2111 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
2112 | ||
2113 | if (ioctl(fd, TIOCNOTTY) < 0) | |
2114 | r = -errno; | |
2115 | ||
2116 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
2117 | ||
2118 | return r; | |
2119 | } | |
2120 | ||
2121 | int sigaction_many(const struct sigaction *sa, ...) { | |
2122 | va_list ap; | |
2123 | int r = 0, sig; | |
2124 | ||
2125 | va_start(ap, sa); | |
2126 | while ((sig = va_arg(ap, int)) > 0) | |
2127 | if (sigaction(sig, sa, NULL) < 0) | |
2128 | r = -errno; | |
2129 | va_end(ap); | |
2130 | ||
2131 | return r; | |
2132 | } | |
2133 | ||
2134 | int ignore_signals(int sig, ...) { | |
2135 | struct sigaction sa = { | |
2136 | .sa_handler = SIG_IGN, | |
2137 | .sa_flags = SA_RESTART, | |
2138 | }; | |
2139 | va_list ap; | |
2140 | int r = 0; | |
2141 | ||
663996b3 MS |
2142 | if (sigaction(sig, &sa, NULL) < 0) |
2143 | r = -errno; | |
2144 | ||
2145 | va_start(ap, sig); | |
2146 | while ((sig = va_arg(ap, int)) > 0) | |
2147 | if (sigaction(sig, &sa, NULL) < 0) | |
2148 | r = -errno; | |
2149 | va_end(ap); | |
2150 | ||
2151 | return r; | |
2152 | } | |
2153 | ||
2154 | int default_signals(int sig, ...) { | |
2155 | struct sigaction sa = { | |
2156 | .sa_handler = SIG_DFL, | |
2157 | .sa_flags = SA_RESTART, | |
2158 | }; | |
2159 | va_list ap; | |
2160 | int r = 0; | |
2161 | ||
2162 | if (sigaction(sig, &sa, NULL) < 0) | |
2163 | r = -errno; | |
2164 | ||
2165 | va_start(ap, sig); | |
2166 | while ((sig = va_arg(ap, int)) > 0) | |
2167 | if (sigaction(sig, &sa, NULL) < 0) | |
2168 | r = -errno; | |
2169 | va_end(ap); | |
2170 | ||
2171 | return r; | |
2172 | } | |
2173 | ||
60f067b4 | 2174 | void safe_close_pair(int p[]) { |
663996b3 MS |
2175 | assert(p); |
2176 | ||
60f067b4 JS |
2177 | if (p[0] == p[1]) { |
2178 | /* Special case pairs which use the same fd in both | |
2179 | * directions... */ | |
2180 | p[0] = p[1] = safe_close(p[0]); | |
2181 | return; | |
663996b3 MS |
2182 | } |
2183 | ||
60f067b4 JS |
2184 | p[0] = safe_close(p[0]); |
2185 | p[1] = safe_close(p[1]); | |
663996b3 MS |
2186 | } |
2187 | ||
2188 | ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll) { | |
60f067b4 | 2189 | uint8_t *p = buf; |
663996b3 MS |
2190 | ssize_t n = 0; |
2191 | ||
2192 | assert(fd >= 0); | |
2193 | assert(buf); | |
2194 | ||
663996b3 MS |
2195 | while (nbytes > 0) { |
2196 | ssize_t k; | |
2197 | ||
60f067b4 JS |
2198 | k = read(fd, p, nbytes); |
2199 | if (k < 0 && errno == EINTR) | |
2200 | continue; | |
663996b3 | 2201 | |
60f067b4 | 2202 | if (k < 0 && errno == EAGAIN && do_poll) { |
663996b3 | 2203 | |
60f067b4 JS |
2204 | /* We knowingly ignore any return value here, |
2205 | * and expect that any error/EOF is reported | |
2206 | * via read() */ | |
663996b3 | 2207 | |
5eef597e | 2208 | fd_wait_for_event(fd, POLLIN, USEC_INFINITY); |
60f067b4 JS |
2209 | continue; |
2210 | } | |
663996b3 | 2211 | |
60f067b4 | 2212 | if (k <= 0) |
663996b3 | 2213 | return n > 0 ? n : (k < 0 ? -errno : 0); |
663996b3 MS |
2214 | |
2215 | p += k; | |
2216 | nbytes -= k; | |
2217 | n += k; | |
2218 | } | |
2219 | ||
2220 | return n; | |
2221 | } | |
2222 | ||
2223 | ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) { | |
60f067b4 | 2224 | const uint8_t *p = buf; |
663996b3 MS |
2225 | ssize_t n = 0; |
2226 | ||
2227 | assert(fd >= 0); | |
2228 | assert(buf); | |
2229 | ||
663996b3 MS |
2230 | while (nbytes > 0) { |
2231 | ssize_t k; | |
2232 | ||
2233 | k = write(fd, p, nbytes); | |
60f067b4 JS |
2234 | if (k < 0 && errno == EINTR) |
2235 | continue; | |
663996b3 | 2236 | |
60f067b4 | 2237 | if (k < 0 && errno == EAGAIN && do_poll) { |
663996b3 | 2238 | |
60f067b4 JS |
2239 | /* We knowingly ignore any return value here, |
2240 | * and expect that any error/EOF is reported | |
2241 | * via write() */ | |
663996b3 | 2242 | |
5eef597e | 2243 | fd_wait_for_event(fd, POLLOUT, USEC_INFINITY); |
60f067b4 JS |
2244 | continue; |
2245 | } | |
663996b3 | 2246 | |
60f067b4 | 2247 | if (k <= 0) |
663996b3 | 2248 | return n > 0 ? n : (k < 0 ? -errno : 0); |
663996b3 MS |
2249 | |
2250 | p += k; | |
2251 | nbytes -= k; | |
2252 | n += k; | |
2253 | } | |
2254 | ||
2255 | return n; | |
2256 | } | |
2257 | ||
60f067b4 JS |
2258 | int parse_size(const char *t, off_t base, off_t *size) { |
2259 | ||
2260 | /* Soo, sometimes we want to parse IEC binary suffxies, and | |
2261 | * sometimes SI decimal suffixes. This function can parse | |
2262 | * both. Which one is the right way depends on the | |
2263 | * context. Wikipedia suggests that SI is customary for | |
2264 | * hardrware metrics and network speeds, while IEC is | |
2265 | * customary for most data sizes used by software and volatile | |
2266 | * (RAM) memory. Hence be careful which one you pick! | |
2267 | * | |
2268 | * In either case we use just K, M, G as suffix, and not Ki, | |
2269 | * Mi, Gi or so (as IEC would suggest). That's because that's | |
2270 | * frickin' ugly. But this means you really need to make sure | |
2271 | * to document which base you are parsing when you use this | |
2272 | * call. */ | |
2273 | ||
2274 | struct table { | |
663996b3 | 2275 | const char *suffix; |
14228c0d | 2276 | unsigned long long factor; |
60f067b4 JS |
2277 | }; |
2278 | ||
2279 | static const struct table iec[] = { | |
663996b3 | 2280 | { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL }, |
60f067b4 JS |
2281 | { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL }, |
2282 | { "T", 1024ULL*1024ULL*1024ULL*1024ULL }, | |
2283 | { "G", 1024ULL*1024ULL*1024ULL }, | |
2284 | { "M", 1024ULL*1024ULL }, | |
2285 | { "K", 1024ULL }, | |
2286 | { "B", 1 }, | |
2287 | { "", 1 }, | |
2288 | }; | |
2289 | ||
2290 | static const struct table si[] = { | |
2291 | { "E", 1000ULL*1000ULL*1000ULL*1000ULL*1000ULL*1000ULL }, | |
2292 | { "P", 1000ULL*1000ULL*1000ULL*1000ULL*1000ULL }, | |
2293 | { "T", 1000ULL*1000ULL*1000ULL*1000ULL }, | |
2294 | { "G", 1000ULL*1000ULL*1000ULL }, | |
2295 | { "M", 1000ULL*1000ULL }, | |
2296 | { "K", 1000ULL }, | |
2297 | { "B", 1 }, | |
663996b3 MS |
2298 | { "", 1 }, |
2299 | }; | |
2300 | ||
60f067b4 | 2301 | const struct table *table; |
663996b3 | 2302 | const char *p; |
14228c0d | 2303 | unsigned long long r = 0; |
60f067b4 | 2304 | unsigned n_entries, start_pos = 0; |
663996b3 MS |
2305 | |
2306 | assert(t); | |
60f067b4 JS |
2307 | assert(base == 1000 || base == 1024); |
2308 | assert(size); | |
2309 | ||
2310 | if (base == 1000) { | |
2311 | table = si; | |
2312 | n_entries = ELEMENTSOF(si); | |
2313 | } else { | |
2314 | table = iec; | |
2315 | n_entries = ELEMENTSOF(iec); | |
2316 | } | |
663996b3 MS |
2317 | |
2318 | p = t; | |
2319 | do { | |
2320 | long long l; | |
60f067b4 JS |
2321 | unsigned long long l2; |
2322 | double frac = 0; | |
663996b3 MS |
2323 | char *e; |
2324 | unsigned i; | |
2325 | ||
2326 | errno = 0; | |
2327 | l = strtoll(p, &e, 10); | |
2328 | ||
2329 | if (errno > 0) | |
2330 | return -errno; | |
2331 | ||
2332 | if (l < 0) | |
2333 | return -ERANGE; | |
2334 | ||
2335 | if (e == p) | |
2336 | return -EINVAL; | |
2337 | ||
60f067b4 JS |
2338 | if (*e == '.') { |
2339 | e++; | |
2340 | if (*e >= '0' && *e <= '9') { | |
2341 | char *e2; | |
2342 | ||
2343 | /* strotoull itself would accept space/+/- */ | |
2344 | l2 = strtoull(e, &e2, 10); | |
2345 | ||
2346 | if (errno == ERANGE) | |
2347 | return -errno; | |
2348 | ||
2349 | /* Ignore failure. E.g. 10.M is valid */ | |
2350 | frac = l2; | |
2351 | for (; e < e2; e++) | |
2352 | frac /= 10; | |
2353 | } | |
2354 | } | |
2355 | ||
663996b3 MS |
2356 | e += strspn(e, WHITESPACE); |
2357 | ||
60f067b4 | 2358 | for (i = start_pos; i < n_entries; i++) |
663996b3 | 2359 | if (startswith(e, table[i].suffix)) { |
14228c0d | 2360 | unsigned long long tmp; |
60f067b4 | 2361 | if ((unsigned long long) l + (frac > 0) > ULLONG_MAX / table[i].factor) |
14228c0d | 2362 | return -ERANGE; |
60f067b4 | 2363 | tmp = l * table[i].factor + (unsigned long long) (frac * table[i].factor); |
14228c0d MB |
2364 | if (tmp > ULLONG_MAX - r) |
2365 | return -ERANGE; | |
2366 | ||
2367 | r += tmp; | |
2368 | if ((unsigned long long) (off_t) r != r) | |
2369 | return -ERANGE; | |
2370 | ||
663996b3 | 2371 | p = e + strlen(table[i].suffix); |
60f067b4 JS |
2372 | |
2373 | start_pos = i + 1; | |
663996b3 MS |
2374 | break; |
2375 | } | |
2376 | ||
60f067b4 | 2377 | if (i >= n_entries) |
663996b3 MS |
2378 | return -EINVAL; |
2379 | ||
14228c0d | 2380 | } while (*p); |
663996b3 | 2381 | |
60f067b4 | 2382 | *size = r; |
663996b3 MS |
2383 | |
2384 | return 0; | |
2385 | } | |
2386 | ||
2387 | int make_stdio(int fd) { | |
2388 | int r, s, t; | |
2389 | ||
2390 | assert(fd >= 0); | |
2391 | ||
2392 | r = dup3(fd, STDIN_FILENO, 0); | |
2393 | s = dup3(fd, STDOUT_FILENO, 0); | |
2394 | t = dup3(fd, STDERR_FILENO, 0); | |
2395 | ||
2396 | if (fd >= 3) | |
60f067b4 | 2397 | safe_close(fd); |
663996b3 MS |
2398 | |
2399 | if (r < 0 || s < 0 || t < 0) | |
2400 | return -errno; | |
2401 | ||
2402 | /* We rely here that the new fd has O_CLOEXEC not set */ | |
2403 | ||
2404 | return 0; | |
2405 | } | |
2406 | ||
2407 | int make_null_stdio(void) { | |
2408 | int null_fd; | |
2409 | ||
2410 | null_fd = open("/dev/null", O_RDWR|O_NOCTTY); | |
2411 | if (null_fd < 0) | |
2412 | return -errno; | |
2413 | ||
2414 | return make_stdio(null_fd); | |
2415 | } | |
2416 | ||
2417 | bool is_device_path(const char *path) { | |
2418 | ||
2419 | /* Returns true on paths that refer to a device, either in | |
2420 | * sysfs or in /dev */ | |
2421 | ||
2422 | return | |
2423 | path_startswith(path, "/dev/") || | |
2424 | path_startswith(path, "/sys/"); | |
2425 | } | |
2426 | ||
2427 | int dir_is_empty(const char *path) { | |
2428 | _cleanup_closedir_ DIR *d; | |
663996b3 MS |
2429 | |
2430 | d = opendir(path); | |
2431 | if (!d) | |
2432 | return -errno; | |
2433 | ||
2434 | for (;;) { | |
2435 | struct dirent *de; | |
663996b3 | 2436 | |
60f067b4 JS |
2437 | errno = 0; |
2438 | de = readdir(d); | |
2439 | if (!de && errno != 0) | |
2440 | return -errno; | |
663996b3 MS |
2441 | |
2442 | if (!de) | |
2443 | return 1; | |
2444 | ||
2445 | if (!ignore_file(de->d_name)) | |
2446 | return 0; | |
2447 | } | |
2448 | } | |
2449 | ||
2450 | char* dirname_malloc(const char *path) { | |
2451 | char *d, *dir, *dir2; | |
2452 | ||
2453 | d = strdup(path); | |
2454 | if (!d) | |
2455 | return NULL; | |
2456 | dir = dirname(d); | |
2457 | assert(dir); | |
2458 | ||
2459 | if (dir != d) { | |
2460 | dir2 = strdup(dir); | |
2461 | free(d); | |
2462 | return dir2; | |
2463 | } | |
2464 | ||
2465 | return dir; | |
2466 | } | |
2467 | ||
60f067b4 | 2468 | int dev_urandom(void *p, size_t n) { |
663996b3 | 2469 | _cleanup_close_ int fd; |
60f067b4 | 2470 | ssize_t k; |
663996b3 MS |
2471 | |
2472 | fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
2473 | if (fd < 0) | |
60f067b4 | 2474 | return errno == ENOENT ? -ENOSYS : -errno; |
663996b3 | 2475 | |
60f067b4 JS |
2476 | k = loop_read(fd, p, n, true); |
2477 | if (k < 0) | |
2478 | return (int) k; | |
2479 | if ((size_t) k != n) | |
2480 | return -EIO; | |
663996b3 | 2481 | |
60f067b4 | 2482 | return 0; |
663996b3 MS |
2483 | } |
2484 | ||
60f067b4 JS |
2485 | void random_bytes(void *p, size_t n) { |
2486 | static bool srand_called = false; | |
2487 | uint8_t *q; | |
2488 | int r; | |
14228c0d | 2489 | |
60f067b4 JS |
2490 | r = dev_urandom(p, n); |
2491 | if (r >= 0) | |
2492 | return; | |
2493 | ||
2494 | /* If some idiot made /dev/urandom unavailable to us, he'll | |
2495 | * get a PRNG instead. */ | |
14228c0d | 2496 | |
60f067b4 JS |
2497 | if (!srand_called) { |
2498 | unsigned x = 0; | |
14228c0d | 2499 | |
60f067b4 JS |
2500 | #ifdef HAVE_SYS_AUXV_H |
2501 | /* The kernel provides us with a bit of entropy in | |
2502 | * auxv, so let's try to make use of that to seed the | |
2503 | * pseudo-random generator. It's better than | |
2504 | * nothing... */ | |
14228c0d | 2505 | |
60f067b4 JS |
2506 | void *auxv; |
2507 | ||
2508 | auxv = (void*) getauxval(AT_RANDOM); | |
2509 | if (auxv) | |
2510 | x ^= *(unsigned*) auxv; | |
2511 | #endif | |
2512 | ||
2513 | x ^= (unsigned) now(CLOCK_REALTIME); | |
2514 | x ^= (unsigned) gettid(); | |
2515 | ||
2516 | srand(x); | |
2517 | srand_called = true; | |
2518 | } | |
2519 | ||
2520 | for (q = p; q < (uint8_t*) p + n; q ++) | |
2521 | *q = rand(); | |
14228c0d MB |
2522 | } |
2523 | ||
663996b3 MS |
2524 | void rename_process(const char name[8]) { |
2525 | assert(name); | |
2526 | ||
2527 | /* This is a like a poor man's setproctitle(). It changes the | |
2528 | * comm field, argv[0], and also the glibc's internally used | |
2529 | * name of the process. For the first one a limit of 16 chars | |
2530 | * applies, to the second one usually one of 10 (i.e. length | |
2531 | * of "/sbin/init"), to the third one one of 7 (i.e. length of | |
2532 | * "systemd"). If you pass a longer string it will be | |
2533 | * truncated */ | |
2534 | ||
2535 | prctl(PR_SET_NAME, name); | |
2536 | ||
2537 | if (program_invocation_name) | |
2538 | strncpy(program_invocation_name, name, strlen(program_invocation_name)); | |
2539 | ||
2540 | if (saved_argc > 0) { | |
2541 | int i; | |
2542 | ||
2543 | if (saved_argv[0]) | |
2544 | strncpy(saved_argv[0], name, strlen(saved_argv[0])); | |
2545 | ||
2546 | for (i = 1; i < saved_argc; i++) { | |
2547 | if (!saved_argv[i]) | |
2548 | break; | |
2549 | ||
60f067b4 | 2550 | memzero(saved_argv[i], strlen(saved_argv[i])); |
663996b3 MS |
2551 | } |
2552 | } | |
2553 | } | |
2554 | ||
2555 | void sigset_add_many(sigset_t *ss, ...) { | |
2556 | va_list ap; | |
2557 | int sig; | |
2558 | ||
2559 | assert(ss); | |
2560 | ||
2561 | va_start(ap, ss); | |
2562 | while ((sig = va_arg(ap, int)) > 0) | |
2563 | assert_se(sigaddset(ss, sig) == 0); | |
2564 | va_end(ap); | |
2565 | } | |
2566 | ||
60f067b4 JS |
2567 | int sigprocmask_many(int how, ...) { |
2568 | va_list ap; | |
2569 | sigset_t ss; | |
2570 | int sig; | |
2571 | ||
2572 | assert_se(sigemptyset(&ss) == 0); | |
2573 | ||
2574 | va_start(ap, how); | |
2575 | while ((sig = va_arg(ap, int)) > 0) | |
2576 | assert_se(sigaddset(&ss, sig) == 0); | |
2577 | va_end(ap); | |
2578 | ||
2579 | if (sigprocmask(how, &ss, NULL) < 0) | |
2580 | return -errno; | |
2581 | ||
2582 | return 0; | |
2583 | } | |
2584 | ||
663996b3 MS |
2585 | char* gethostname_malloc(void) { |
2586 | struct utsname u; | |
2587 | ||
2588 | assert_se(uname(&u) >= 0); | |
2589 | ||
2590 | if (!isempty(u.nodename) && !streq(u.nodename, "(none)")) | |
2591 | return strdup(u.nodename); | |
2592 | ||
2593 | return strdup(u.sysname); | |
2594 | } | |
2595 | ||
2596 | bool hostname_is_set(void) { | |
2597 | struct utsname u; | |
2598 | ||
2599 | assert_se(uname(&u) >= 0); | |
2600 | ||
2601 | return !isempty(u.nodename) && !streq(u.nodename, "(none)"); | |
2602 | } | |
2603 | ||
5eef597e | 2604 | char *lookup_uid(uid_t uid) { |
663996b3 MS |
2605 | long bufsize; |
2606 | char *name; | |
2607 | _cleanup_free_ char *buf = NULL; | |
2608 | struct passwd pwbuf, *pw = NULL; | |
2609 | ||
2610 | /* Shortcut things to avoid NSS lookups */ | |
2611 | if (uid == 0) | |
2612 | return strdup("root"); | |
2613 | ||
2614 | bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); | |
2615 | if (bufsize <= 0) | |
2616 | bufsize = 4096; | |
2617 | ||
2618 | buf = malloc(bufsize); | |
2619 | if (!buf) | |
2620 | return NULL; | |
2621 | ||
2622 | if (getpwuid_r(uid, &pwbuf, buf, bufsize, &pw) == 0 && pw) | |
2623 | return strdup(pw->pw_name); | |
2624 | ||
60f067b4 | 2625 | if (asprintf(&name, UID_FMT, uid) < 0) |
663996b3 MS |
2626 | return NULL; |
2627 | ||
2628 | return name; | |
2629 | } | |
2630 | ||
2631 | char* getlogname_malloc(void) { | |
2632 | uid_t uid; | |
2633 | struct stat st; | |
2634 | ||
2635 | if (isatty(STDIN_FILENO) && fstat(STDIN_FILENO, &st) >= 0) | |
2636 | uid = st.st_uid; | |
2637 | else | |
2638 | uid = getuid(); | |
2639 | ||
2640 | return lookup_uid(uid); | |
2641 | } | |
2642 | ||
2643 | char *getusername_malloc(void) { | |
2644 | const char *e; | |
2645 | ||
2646 | e = getenv("USER"); | |
2647 | if (e) | |
2648 | return strdup(e); | |
2649 | ||
2650 | return lookup_uid(getuid()); | |
2651 | } | |
2652 | ||
2653 | int getttyname_malloc(int fd, char **r) { | |
2654 | char path[PATH_MAX], *c; | |
2655 | int k; | |
2656 | ||
2657 | assert(r); | |
2658 | ||
2659 | k = ttyname_r(fd, path, sizeof(path)); | |
60f067b4 | 2660 | if (k > 0) |
663996b3 MS |
2661 | return -k; |
2662 | ||
2663 | char_array_0(path); | |
2664 | ||
2665 | c = strdup(startswith(path, "/dev/") ? path + 5 : path); | |
2666 | if (!c) | |
2667 | return -ENOMEM; | |
2668 | ||
2669 | *r = c; | |
2670 | return 0; | |
2671 | } | |
2672 | ||
2673 | int getttyname_harder(int fd, char **r) { | |
2674 | int k; | |
2675 | char *s; | |
2676 | ||
2677 | k = getttyname_malloc(fd, &s); | |
2678 | if (k < 0) | |
2679 | return k; | |
2680 | ||
2681 | if (streq(s, "tty")) { | |
2682 | free(s); | |
2683 | return get_ctty(0, NULL, r); | |
2684 | } | |
2685 | ||
2686 | *r = s; | |
2687 | return 0; | |
2688 | } | |
2689 | ||
2690 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
60f067b4 JS |
2691 | int r; |
2692 | _cleanup_free_ char *line = NULL; | |
2693 | const char *p; | |
663996b3 | 2694 | unsigned long ttynr; |
663996b3 MS |
2695 | |
2696 | assert(pid >= 0); | |
663996b3 | 2697 | |
60f067b4 JS |
2698 | p = procfs_file_alloca(pid, "stat"); |
2699 | r = read_one_line_file(p, &line); | |
2700 | if (r < 0) | |
2701 | return r; | |
663996b3 MS |
2702 | |
2703 | p = strrchr(line, ')'); | |
2704 | if (!p) | |
2705 | return -EIO; | |
2706 | ||
2707 | p++; | |
2708 | ||
2709 | if (sscanf(p, " " | |
2710 | "%*c " /* state */ | |
2711 | "%*d " /* ppid */ | |
2712 | "%*d " /* pgrp */ | |
2713 | "%*d " /* session */ | |
2714 | "%lu ", /* ttynr */ | |
2715 | &ttynr) != 1) | |
2716 | return -EIO; | |
2717 | ||
2718 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
2719 | return -ENOENT; | |
2720 | ||
60f067b4 JS |
2721 | if (d) |
2722 | *d = (dev_t) ttynr; | |
2723 | ||
663996b3 MS |
2724 | return 0; |
2725 | } | |
2726 | ||
2727 | int get_ctty(pid_t pid, dev_t *_devnr, char **r) { | |
60f067b4 JS |
2728 | char fn[sizeof("/dev/char/")-1 + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL; |
2729 | _cleanup_free_ char *s = NULL; | |
2730 | const char *p; | |
663996b3 | 2731 | dev_t devnr; |
60f067b4 | 2732 | int k; |
663996b3 MS |
2733 | |
2734 | assert(r); | |
2735 | ||
2736 | k = get_ctty_devnr(pid, &devnr); | |
2737 | if (k < 0) | |
2738 | return k; | |
2739 | ||
2740 | snprintf(fn, sizeof(fn), "/dev/char/%u:%u", major(devnr), minor(devnr)); | |
2741 | ||
2742 | k = readlink_malloc(fn, &s); | |
2743 | if (k < 0) { | |
2744 | ||
2745 | if (k != -ENOENT) | |
2746 | return k; | |
2747 | ||
2748 | /* This is an ugly hack */ | |
2749 | if (major(devnr) == 136) { | |
60f067b4 JS |
2750 | asprintf(&b, "pts/%u", minor(devnr)); |
2751 | goto finish; | |
663996b3 MS |
2752 | } |
2753 | ||
2754 | /* Probably something like the ptys which have no | |
2755 | * symlink in /dev/char. Let's return something | |
2756 | * vaguely useful. */ | |
2757 | ||
2758 | b = strdup(fn + 5); | |
60f067b4 | 2759 | goto finish; |
663996b3 MS |
2760 | } |
2761 | ||
2762 | if (startswith(s, "/dev/")) | |
2763 | p = s + 5; | |
2764 | else if (startswith(s, "../")) | |
2765 | p = s + 3; | |
2766 | else | |
2767 | p = s; | |
2768 | ||
2769 | b = strdup(p); | |
663996b3 | 2770 | |
60f067b4 | 2771 | finish: |
663996b3 MS |
2772 | if (!b) |
2773 | return -ENOMEM; | |
2774 | ||
2775 | *r = b; | |
2776 | if (_devnr) | |
2777 | *_devnr = devnr; | |
2778 | ||
2779 | return 0; | |
2780 | } | |
2781 | ||
2782 | int rm_rf_children_dangerous(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) { | |
e842803a | 2783 | _cleanup_closedir_ DIR *d = NULL; |
663996b3 MS |
2784 | int ret = 0; |
2785 | ||
2786 | assert(fd >= 0); | |
2787 | ||
2788 | /* This returns the first error we run into, but nevertheless | |
2789 | * tries to go on. This closes the passed fd. */ | |
2790 | ||
2791 | d = fdopendir(fd); | |
2792 | if (!d) { | |
60f067b4 | 2793 | safe_close(fd); |
663996b3 MS |
2794 | |
2795 | return errno == ENOENT ? 0 : -errno; | |
2796 | } | |
2797 | ||
2798 | for (;;) { | |
2799 | struct dirent *de; | |
663996b3 MS |
2800 | bool is_dir, keep_around; |
2801 | struct stat st; | |
2802 | int r; | |
2803 | ||
60f067b4 JS |
2804 | errno = 0; |
2805 | de = readdir(d); | |
e842803a MB |
2806 | if (!de) { |
2807 | if (errno != 0 && ret == 0) | |
60f067b4 | 2808 | ret = -errno; |
e842803a | 2809 | return ret; |
663996b3 MS |
2810 | } |
2811 | ||
663996b3 MS |
2812 | if (streq(de->d_name, ".") || streq(de->d_name, "..")) |
2813 | continue; | |
2814 | ||
2815 | if (de->d_type == DT_UNKNOWN || | |
2816 | honour_sticky || | |
2817 | (de->d_type == DT_DIR && root_dev)) { | |
2818 | if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) { | |
2819 | if (ret == 0 && errno != ENOENT) | |
2820 | ret = -errno; | |
2821 | continue; | |
2822 | } | |
2823 | ||
2824 | is_dir = S_ISDIR(st.st_mode); | |
2825 | keep_around = | |
2826 | honour_sticky && | |
2827 | (st.st_uid == 0 || st.st_uid == getuid()) && | |
2828 | (st.st_mode & S_ISVTX); | |
2829 | } else { | |
2830 | is_dir = de->d_type == DT_DIR; | |
2831 | keep_around = false; | |
2832 | } | |
2833 | ||
2834 | if (is_dir) { | |
2835 | int subdir_fd; | |
2836 | ||
2837 | /* if root_dev is set, remove subdirectories only, if device is same as dir */ | |
2838 | if (root_dev && st.st_dev != root_dev->st_dev) | |
2839 | continue; | |
2840 | ||
2841 | subdir_fd = openat(fd, de->d_name, | |
2842 | O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME); | |
2843 | if (subdir_fd < 0) { | |
2844 | if (ret == 0 && errno != ENOENT) | |
2845 | ret = -errno; | |
2846 | continue; | |
2847 | } | |
2848 | ||
2849 | r = rm_rf_children_dangerous(subdir_fd, only_dirs, honour_sticky, root_dev); | |
2850 | if (r < 0 && ret == 0) | |
2851 | ret = r; | |
2852 | ||
2853 | if (!keep_around) | |
2854 | if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) { | |
2855 | if (ret == 0 && errno != ENOENT) | |
2856 | ret = -errno; | |
2857 | } | |
2858 | ||
2859 | } else if (!only_dirs && !keep_around) { | |
2860 | ||
2861 | if (unlinkat(fd, de->d_name, 0) < 0) { | |
2862 | if (ret == 0 && errno != ENOENT) | |
2863 | ret = -errno; | |
2864 | } | |
2865 | } | |
2866 | } | |
663996b3 MS |
2867 | } |
2868 | ||
2869 | _pure_ static int is_temporary_fs(struct statfs *s) { | |
2870 | assert(s); | |
60f067b4 JS |
2871 | |
2872 | return F_TYPE_EQUAL(s->f_type, TMPFS_MAGIC) || | |
2873 | F_TYPE_EQUAL(s->f_type, RAMFS_MAGIC); | |
663996b3 MS |
2874 | } |
2875 | ||
2876 | int rm_rf_children(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) { | |
2877 | struct statfs s; | |
2878 | ||
2879 | assert(fd >= 0); | |
2880 | ||
2881 | if (fstatfs(fd, &s) < 0) { | |
60f067b4 | 2882 | safe_close(fd); |
663996b3 MS |
2883 | return -errno; |
2884 | } | |
2885 | ||
2886 | /* We refuse to clean disk file systems with this call. This | |
2887 | * is extra paranoia just to be sure we never ever remove | |
2888 | * non-state data */ | |
2889 | if (!is_temporary_fs(&s)) { | |
2890 | log_error("Attempted to remove disk file system, and we can't allow that."); | |
60f067b4 | 2891 | safe_close(fd); |
663996b3 MS |
2892 | return -EPERM; |
2893 | } | |
2894 | ||
2895 | return rm_rf_children_dangerous(fd, only_dirs, honour_sticky, root_dev); | |
2896 | } | |
2897 | ||
2898 | static int rm_rf_internal(const char *path, bool only_dirs, bool delete_root, bool honour_sticky, bool dangerous) { | |
2899 | int fd, r; | |
2900 | struct statfs s; | |
2901 | ||
2902 | assert(path); | |
2903 | ||
2904 | /* We refuse to clean the root file system with this | |
2905 | * call. This is extra paranoia to never cause a really | |
2906 | * seriously broken system. */ | |
2907 | if (path_equal(path, "/")) { | |
2908 | log_error("Attempted to remove entire root file system, and we can't allow that."); | |
2909 | return -EPERM; | |
2910 | } | |
2911 | ||
2912 | fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME); | |
2913 | if (fd < 0) { | |
2914 | ||
2915 | if (errno != ENOTDIR) | |
2916 | return -errno; | |
2917 | ||
2918 | if (!dangerous) { | |
2919 | if (statfs(path, &s) < 0) | |
2920 | return -errno; | |
2921 | ||
2922 | if (!is_temporary_fs(&s)) { | |
2923 | log_error("Attempted to remove disk file system, and we can't allow that."); | |
2924 | return -EPERM; | |
2925 | } | |
2926 | } | |
2927 | ||
2928 | if (delete_root && !only_dirs) | |
2929 | if (unlink(path) < 0 && errno != ENOENT) | |
2930 | return -errno; | |
2931 | ||
2932 | return 0; | |
2933 | } | |
2934 | ||
2935 | if (!dangerous) { | |
2936 | if (fstatfs(fd, &s) < 0) { | |
60f067b4 | 2937 | safe_close(fd); |
663996b3 MS |
2938 | return -errno; |
2939 | } | |
2940 | ||
2941 | if (!is_temporary_fs(&s)) { | |
2942 | log_error("Attempted to remove disk file system, and we can't allow that."); | |
60f067b4 | 2943 | safe_close(fd); |
663996b3 MS |
2944 | return -EPERM; |
2945 | } | |
2946 | } | |
2947 | ||
2948 | r = rm_rf_children_dangerous(fd, only_dirs, honour_sticky, NULL); | |
2949 | if (delete_root) { | |
2950 | ||
2951 | if (honour_sticky && file_is_priv_sticky(path) > 0) | |
2952 | return r; | |
2953 | ||
2954 | if (rmdir(path) < 0 && errno != ENOENT) { | |
2955 | if (r == 0) | |
2956 | r = -errno; | |
2957 | } | |
2958 | } | |
2959 | ||
2960 | return r; | |
2961 | } | |
2962 | ||
2963 | int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) { | |
2964 | return rm_rf_internal(path, only_dirs, delete_root, honour_sticky, false); | |
2965 | } | |
2966 | ||
2967 | int rm_rf_dangerous(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) { | |
2968 | return rm_rf_internal(path, only_dirs, delete_root, honour_sticky, true); | |
2969 | } | |
2970 | ||
2971 | int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) { | |
2972 | assert(path); | |
2973 | ||
2974 | /* Under the assumption that we are running privileged we | |
2975 | * first change the access mode and only then hand out | |
2976 | * ownership to avoid a window where access is too open. */ | |
2977 | ||
2978 | if (mode != (mode_t) -1) | |
2979 | if (chmod(path, mode) < 0) | |
2980 | return -errno; | |
2981 | ||
2982 | if (uid != (uid_t) -1 || gid != (gid_t) -1) | |
2983 | if (chown(path, uid, gid) < 0) | |
2984 | return -errno; | |
2985 | ||
2986 | return 0; | |
2987 | } | |
2988 | ||
2989 | int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid) { | |
2990 | assert(fd >= 0); | |
2991 | ||
2992 | /* Under the assumption that we are running privileged we | |
2993 | * first change the access mode and only then hand out | |
2994 | * ownership to avoid a window where access is too open. */ | |
2995 | ||
60f067b4 JS |
2996 | if (mode != (mode_t) -1) |
2997 | if (fchmod(fd, mode) < 0) | |
2998 | return -errno; | |
663996b3 | 2999 | |
60f067b4 JS |
3000 | if (uid != (uid_t) -1 || gid != (gid_t) -1) |
3001 | if (fchown(fd, uid, gid) < 0) | |
3002 | return -errno; | |
663996b3 MS |
3003 | |
3004 | return 0; | |
3005 | } | |
3006 | ||
3007 | cpu_set_t* cpu_set_malloc(unsigned *ncpus) { | |
3008 | cpu_set_t *r; | |
3009 | unsigned n = 1024; | |
3010 | ||
3011 | /* Allocates the cpuset in the right size */ | |
3012 | ||
3013 | for (;;) { | |
3014 | if (!(r = CPU_ALLOC(n))) | |
3015 | return NULL; | |
3016 | ||
3017 | if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), r) >= 0) { | |
3018 | CPU_ZERO_S(CPU_ALLOC_SIZE(n), r); | |
3019 | ||
3020 | if (ncpus) | |
3021 | *ncpus = n; | |
3022 | ||
3023 | return r; | |
3024 | } | |
3025 | ||
3026 | CPU_FREE(r); | |
3027 | ||
3028 | if (errno != EINVAL) | |
3029 | return NULL; | |
3030 | ||
3031 | n *= 2; | |
3032 | } | |
3033 | } | |
3034 | ||
3035 | int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) { | |
3036 | static const char status_indent[] = " "; /* "[" STATUS "] " */ | |
3037 | _cleanup_free_ char *s = NULL; | |
3038 | _cleanup_close_ int fd = -1; | |
3039 | struct iovec iovec[6] = {}; | |
3040 | int n = 0; | |
3041 | static bool prev_ephemeral; | |
3042 | ||
3043 | assert(format); | |
3044 | ||
3045 | /* This is independent of logging, as status messages are | |
3046 | * optional and go exclusively to the console. */ | |
3047 | ||
3048 | if (vasprintf(&s, format, ap) < 0) | |
3049 | return log_oom(); | |
3050 | ||
3051 | fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); | |
3052 | if (fd < 0) | |
3053 | return fd; | |
3054 | ||
3055 | if (ellipse) { | |
3056 | char *e; | |
3057 | size_t emax, sl; | |
3058 | int c; | |
3059 | ||
3060 | c = fd_columns(fd); | |
3061 | if (c <= 0) | |
3062 | c = 80; | |
3063 | ||
3064 | sl = status ? sizeof(status_indent)-1 : 0; | |
3065 | ||
3066 | emax = c - sl - 1; | |
3067 | if (emax < 3) | |
3068 | emax = 3; | |
3069 | ||
5eef597e | 3070 | e = ellipsize(s, emax, 50); |
663996b3 MS |
3071 | if (e) { |
3072 | free(s); | |
3073 | s = e; | |
3074 | } | |
3075 | } | |
3076 | ||
3077 | if (prev_ephemeral) | |
3078 | IOVEC_SET_STRING(iovec[n++], "\r" ANSI_ERASE_TO_END_OF_LINE); | |
3079 | prev_ephemeral = ephemeral; | |
3080 | ||
3081 | if (status) { | |
3082 | if (!isempty(status)) { | |
3083 | IOVEC_SET_STRING(iovec[n++], "["); | |
3084 | IOVEC_SET_STRING(iovec[n++], status); | |
3085 | IOVEC_SET_STRING(iovec[n++], "] "); | |
3086 | } else | |
3087 | IOVEC_SET_STRING(iovec[n++], status_indent); | |
3088 | } | |
3089 | ||
3090 | IOVEC_SET_STRING(iovec[n++], s); | |
3091 | if (!ephemeral) | |
3092 | IOVEC_SET_STRING(iovec[n++], "\n"); | |
3093 | ||
3094 | if (writev(fd, iovec, n) < 0) | |
3095 | return -errno; | |
3096 | ||
3097 | return 0; | |
3098 | } | |
3099 | ||
3100 | int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) { | |
3101 | va_list ap; | |
3102 | int r; | |
3103 | ||
3104 | assert(format); | |
3105 | ||
3106 | va_start(ap, format); | |
3107 | r = status_vprintf(status, ellipse, ephemeral, format, ap); | |
3108 | va_end(ap); | |
3109 | ||
3110 | return r; | |
3111 | } | |
3112 | ||
663996b3 MS |
3113 | char *replace_env(const char *format, char **env) { |
3114 | enum { | |
3115 | WORD, | |
3116 | CURLY, | |
3117 | VARIABLE | |
3118 | } state = WORD; | |
3119 | ||
3120 | const char *e, *word = format; | |
3121 | char *r = NULL, *k; | |
3122 | ||
3123 | assert(format); | |
3124 | ||
3125 | for (e = format; *e; e ++) { | |
3126 | ||
3127 | switch (state) { | |
3128 | ||
3129 | case WORD: | |
3130 | if (*e == '$') | |
3131 | state = CURLY; | |
3132 | break; | |
3133 | ||
3134 | case CURLY: | |
3135 | if (*e == '{') { | |
3136 | if (!(k = strnappend(r, word, e-word-1))) | |
3137 | goto fail; | |
3138 | ||
3139 | free(r); | |
3140 | r = k; | |
3141 | ||
3142 | word = e-1; | |
3143 | state = VARIABLE; | |
3144 | ||
3145 | } else if (*e == '$') { | |
3146 | if (!(k = strnappend(r, word, e-word))) | |
3147 | goto fail; | |
3148 | ||
3149 | free(r); | |
3150 | r = k; | |
3151 | ||
3152 | word = e+1; | |
3153 | state = WORD; | |
3154 | } else | |
3155 | state = WORD; | |
3156 | break; | |
3157 | ||
3158 | case VARIABLE: | |
3159 | if (*e == '}') { | |
3160 | const char *t; | |
3161 | ||
3162 | t = strempty(strv_env_get_n(env, word+2, e-word-2)); | |
3163 | ||
3164 | k = strappend(r, t); | |
3165 | if (!k) | |
3166 | goto fail; | |
3167 | ||
3168 | free(r); | |
3169 | r = k; | |
3170 | ||
3171 | word = e+1; | |
3172 | state = WORD; | |
3173 | } | |
3174 | break; | |
3175 | } | |
3176 | } | |
3177 | ||
3178 | if (!(k = strnappend(r, word, e-word))) | |
3179 | goto fail; | |
3180 | ||
3181 | free(r); | |
3182 | return k; | |
3183 | ||
3184 | fail: | |
3185 | free(r); | |
3186 | return NULL; | |
3187 | } | |
3188 | ||
3189 | char **replace_env_argv(char **argv, char **env) { | |
5eef597e | 3190 | char **ret, **i; |
663996b3 MS |
3191 | unsigned k = 0, l = 0; |
3192 | ||
3193 | l = strv_length(argv); | |
3194 | ||
5eef597e MP |
3195 | ret = new(char*, l+1); |
3196 | if (!ret) | |
663996b3 MS |
3197 | return NULL; |
3198 | ||
3199 | STRV_FOREACH(i, argv) { | |
3200 | ||
3201 | /* If $FOO appears as single word, replace it by the split up variable */ | |
3202 | if ((*i)[0] == '$' && (*i)[1] != '{') { | |
3203 | char *e; | |
3204 | char **w, **m; | |
3205 | unsigned q; | |
3206 | ||
3207 | e = strv_env_get(env, *i+1); | |
3208 | if (e) { | |
5eef597e | 3209 | int r; |
663996b3 | 3210 | |
5eef597e MP |
3211 | r = strv_split_quoted(&m, e); |
3212 | if (r < 0) { | |
3213 | ret[k] = NULL; | |
3214 | strv_free(ret); | |
663996b3 MS |
3215 | return NULL; |
3216 | } | |
3217 | } else | |
3218 | m = NULL; | |
3219 | ||
3220 | q = strv_length(m); | |
3221 | l = l + q - 1; | |
3222 | ||
5eef597e MP |
3223 | w = realloc(ret, sizeof(char*) * (l+1)); |
3224 | if (!w) { | |
3225 | ret[k] = NULL; | |
3226 | strv_free(ret); | |
663996b3 MS |
3227 | strv_free(m); |
3228 | return NULL; | |
3229 | } | |
3230 | ||
5eef597e | 3231 | ret = w; |
663996b3 | 3232 | if (m) { |
5eef597e | 3233 | memcpy(ret + k, m, q * sizeof(char*)); |
663996b3 MS |
3234 | free(m); |
3235 | } | |
3236 | ||
3237 | k += q; | |
3238 | continue; | |
3239 | } | |
3240 | ||
3241 | /* If ${FOO} appears as part of a word, replace it by the variable as-is */ | |
5eef597e MP |
3242 | ret[k] = replace_env(*i, env); |
3243 | if (!ret[k]) { | |
3244 | strv_free(ret); | |
663996b3 MS |
3245 | return NULL; |
3246 | } | |
5eef597e | 3247 | k++; |
663996b3 MS |
3248 | } |
3249 | ||
5eef597e MP |
3250 | ret[k] = NULL; |
3251 | return ret; | |
663996b3 MS |
3252 | } |
3253 | ||
3254 | int fd_columns(int fd) { | |
3255 | struct winsize ws = {}; | |
3256 | ||
3257 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
3258 | return -errno; | |
3259 | ||
3260 | if (ws.ws_col <= 0) | |
3261 | return -EIO; | |
3262 | ||
3263 | return ws.ws_col; | |
3264 | } | |
3265 | ||
3266 | unsigned columns(void) { | |
3267 | const char *e; | |
3268 | int c; | |
3269 | ||
3270 | if (_likely_(cached_columns > 0)) | |
3271 | return cached_columns; | |
3272 | ||
3273 | c = 0; | |
3274 | e = getenv("COLUMNS"); | |
3275 | if (e) | |
5eef597e | 3276 | (void) safe_atoi(e, &c); |
663996b3 MS |
3277 | |
3278 | if (c <= 0) | |
3279 | c = fd_columns(STDOUT_FILENO); | |
3280 | ||
3281 | if (c <= 0) | |
3282 | c = 80; | |
3283 | ||
3284 | cached_columns = c; | |
3285 | return c; | |
3286 | } | |
3287 | ||
3288 | int fd_lines(int fd) { | |
3289 | struct winsize ws = {}; | |
3290 | ||
3291 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
3292 | return -errno; | |
3293 | ||
3294 | if (ws.ws_row <= 0) | |
3295 | return -EIO; | |
3296 | ||
3297 | return ws.ws_row; | |
3298 | } | |
3299 | ||
3300 | unsigned lines(void) { | |
3301 | const char *e; | |
3302 | unsigned l; | |
3303 | ||
3304 | if (_likely_(cached_lines > 0)) | |
3305 | return cached_lines; | |
3306 | ||
3307 | l = 0; | |
3308 | e = getenv("LINES"); | |
3309 | if (e) | |
5eef597e | 3310 | (void) safe_atou(e, &l); |
663996b3 MS |
3311 | |
3312 | if (l <= 0) | |
3313 | l = fd_lines(STDOUT_FILENO); | |
3314 | ||
3315 | if (l <= 0) | |
3316 | l = 24; | |
3317 | ||
3318 | cached_lines = l; | |
3319 | return cached_lines; | |
3320 | } | |
3321 | ||
3322 | /* intended to be used as a SIGWINCH sighandler */ | |
3323 | void columns_lines_cache_reset(int signum) { | |
3324 | cached_columns = 0; | |
3325 | cached_lines = 0; | |
3326 | } | |
3327 | ||
3328 | bool on_tty(void) { | |
3329 | static int cached_on_tty = -1; | |
3330 | ||
3331 | if (_unlikely_(cached_on_tty < 0)) | |
3332 | cached_on_tty = isatty(STDOUT_FILENO) > 0; | |
3333 | ||
3334 | return cached_on_tty; | |
3335 | } | |
3336 | ||
60f067b4 JS |
3337 | int files_same(const char *filea, const char *fileb) { |
3338 | struct stat a, b; | |
663996b3 | 3339 | |
60f067b4 | 3340 | if (stat(filea, &a) < 0) |
663996b3 MS |
3341 | return -errno; |
3342 | ||
60f067b4 | 3343 | if (stat(fileb, &b) < 0) |
663996b3 MS |
3344 | return -errno; |
3345 | ||
60f067b4 JS |
3346 | return a.st_dev == b.st_dev && |
3347 | a.st_ino == b.st_ino; | |
663996b3 MS |
3348 | } |
3349 | ||
60f067b4 JS |
3350 | int running_in_chroot(void) { |
3351 | int ret; | |
3352 | ||
3353 | ret = files_same("/proc/1/root", "/"); | |
3354 | if (ret < 0) | |
3355 | return ret; | |
3356 | ||
3357 | return ret == 0; | |
3358 | } | |
3359 | ||
3360 | static char *ascii_ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) { | |
663996b3 MS |
3361 | size_t x; |
3362 | char *r; | |
3363 | ||
3364 | assert(s); | |
3365 | assert(percent <= 100); | |
3366 | assert(new_length >= 3); | |
3367 | ||
3368 | if (old_length <= 3 || old_length <= new_length) | |
3369 | return strndup(s, old_length); | |
3370 | ||
3371 | r = new0(char, new_length+1); | |
3372 | if (!r) | |
14228c0d | 3373 | return NULL; |
663996b3 MS |
3374 | |
3375 | x = (new_length * percent) / 100; | |
3376 | ||
3377 | if (x > new_length - 3) | |
3378 | x = new_length - 3; | |
3379 | ||
3380 | memcpy(r, s, x); | |
3381 | r[x] = '.'; | |
3382 | r[x+1] = '.'; | |
3383 | r[x+2] = '.'; | |
3384 | memcpy(r + x + 3, | |
3385 | s + old_length - (new_length - x - 3), | |
3386 | new_length - x - 3); | |
3387 | ||
3388 | return r; | |
3389 | } | |
3390 | ||
60f067b4 JS |
3391 | char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) { |
3392 | size_t x; | |
3393 | char *e; | |
3394 | const char *i, *j; | |
3395 | unsigned k, len, len2; | |
3396 | ||
3397 | assert(s); | |
3398 | assert(percent <= 100); | |
3399 | assert(new_length >= 3); | |
3400 | ||
3401 | /* if no multibyte characters use ascii_ellipsize_mem for speed */ | |
3402 | if (ascii_is_valid(s)) | |
3403 | return ascii_ellipsize_mem(s, old_length, new_length, percent); | |
3404 | ||
3405 | if (old_length <= 3 || old_length <= new_length) | |
3406 | return strndup(s, old_length); | |
3407 | ||
3408 | x = (new_length * percent) / 100; | |
3409 | ||
3410 | if (x > new_length - 3) | |
3411 | x = new_length - 3; | |
3412 | ||
3413 | k = 0; | |
3414 | for (i = s; k < x && i < s + old_length; i = utf8_next_char(i)) { | |
3415 | int c; | |
3416 | ||
3417 | c = utf8_encoded_to_unichar(i); | |
3418 | if (c < 0) | |
3419 | return NULL; | |
3420 | k += unichar_iswide(c) ? 2 : 1; | |
3421 | } | |
3422 | ||
3423 | if (k > x) /* last character was wide and went over quota */ | |
3424 | x ++; | |
3425 | ||
3426 | for (j = s + old_length; k < new_length && j > i; ) { | |
3427 | int c; | |
3428 | ||
3429 | j = utf8_prev_char(j); | |
3430 | c = utf8_encoded_to_unichar(j); | |
3431 | if (c < 0) | |
3432 | return NULL; | |
3433 | k += unichar_iswide(c) ? 2 : 1; | |
3434 | } | |
3435 | assert(i <= j); | |
3436 | ||
3437 | /* we don't actually need to ellipsize */ | |
3438 | if (i == j) | |
3439 | return memdup(s, old_length + 1); | |
3440 | ||
3441 | /* make space for ellipsis */ | |
3442 | j = utf8_next_char(j); | |
3443 | ||
3444 | len = i - s; | |
3445 | len2 = s + old_length - j; | |
3446 | e = new(char, len + 3 + len2 + 1); | |
3447 | if (!e) | |
3448 | return NULL; | |
3449 | ||
3450 | /* | |
3451 | printf("old_length=%zu new_length=%zu x=%zu len=%u len2=%u k=%u\n", | |
3452 | old_length, new_length, x, len, len2, k); | |
3453 | */ | |
3454 | ||
3455 | memcpy(e, s, len); | |
3456 | e[len] = 0xe2; /* tri-dot ellipsis: … */ | |
3457 | e[len + 1] = 0x80; | |
3458 | e[len + 2] = 0xa6; | |
3459 | ||
3460 | memcpy(e + len + 3, j, len2 + 1); | |
3461 | ||
3462 | return e; | |
3463 | } | |
3464 | ||
663996b3 MS |
3465 | char *ellipsize(const char *s, size_t length, unsigned percent) { |
3466 | return ellipsize_mem(s, strlen(s), length, percent); | |
3467 | } | |
3468 | ||
60f067b4 JS |
3469 | int touch_file(const char *path, bool parents, usec_t stamp, uid_t uid, gid_t gid, mode_t mode) { |
3470 | _cleanup_close_ int fd; | |
3471 | int r; | |
663996b3 MS |
3472 | |
3473 | assert(path); | |
3474 | ||
60f067b4 JS |
3475 | if (parents) |
3476 | mkdir_parents(path, 0755); | |
663996b3 | 3477 | |
60f067b4 | 3478 | fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode > 0 ? mode : 0644); |
663996b3 MS |
3479 | if (fd < 0) |
3480 | return -errno; | |
3481 | ||
60f067b4 JS |
3482 | if (mode > 0) { |
3483 | r = fchmod(fd, mode); | |
3484 | if (r < 0) | |
3485 | return -errno; | |
3486 | } | |
3487 | ||
3488 | if (uid != (uid_t) -1 || gid != (gid_t) -1) { | |
3489 | r = fchown(fd, uid, gid); | |
3490 | if (r < 0) | |
3491 | return -errno; | |
3492 | } | |
3493 | ||
5eef597e | 3494 | if (stamp != USEC_INFINITY) { |
60f067b4 JS |
3495 | struct timespec ts[2]; |
3496 | ||
3497 | timespec_store(&ts[0], stamp); | |
3498 | ts[1] = ts[0]; | |
3499 | r = futimens(fd, ts); | |
3500 | } else | |
3501 | r = futimens(fd, NULL); | |
3502 | if (r < 0) | |
3503 | return -errno; | |
3504 | ||
663996b3 MS |
3505 | return 0; |
3506 | } | |
3507 | ||
60f067b4 | 3508 | int touch(const char *path) { |
5eef597e | 3509 | return touch_file(path, false, USEC_INFINITY, (uid_t) -1, (gid_t) -1, 0); |
60f067b4 JS |
3510 | } |
3511 | ||
663996b3 MS |
3512 | char *unquote(const char *s, const char* quotes) { |
3513 | size_t l; | |
3514 | assert(s); | |
3515 | ||
3516 | /* This is rather stupid, simply removes the heading and | |
3517 | * trailing quotes if there is one. Doesn't care about | |
3518 | * escaping or anything. We should make this smarter one | |
3519 | * day...*/ | |
3520 | ||
3521 | l = strlen(s); | |
3522 | if (l < 2) | |
3523 | return strdup(s); | |
3524 | ||
3525 | if (strchr(quotes, s[0]) && s[l-1] == s[0]) | |
3526 | return strndup(s+1, l-2); | |
3527 | ||
3528 | return strdup(s); | |
3529 | } | |
3530 | ||
3531 | char *normalize_env_assignment(const char *s) { | |
3532 | _cleanup_free_ char *name = NULL, *value = NULL, *p = NULL; | |
3533 | char *eq, *r; | |
3534 | ||
3535 | eq = strchr(s, '='); | |
3536 | if (!eq) { | |
3537 | char *t; | |
3538 | ||
3539 | r = strdup(s); | |
3540 | if (!r) | |
3541 | return NULL; | |
3542 | ||
3543 | t = strstrip(r); | |
3544 | if (t == r) | |
3545 | return r; | |
3546 | ||
3547 | memmove(r, t, strlen(t) + 1); | |
3548 | return r; | |
3549 | } | |
3550 | ||
3551 | name = strndup(s, eq - s); | |
3552 | if (!name) | |
3553 | return NULL; | |
3554 | ||
3555 | p = strdup(eq + 1); | |
3556 | if (!p) | |
3557 | return NULL; | |
3558 | ||
3559 | value = unquote(strstrip(p), QUOTES); | |
3560 | if (!value) | |
3561 | return NULL; | |
3562 | ||
3563 | if (asprintf(&r, "%s=%s", strstrip(name), value) < 0) | |
3564 | r = NULL; | |
3565 | ||
3566 | return r; | |
3567 | } | |
3568 | ||
3569 | int wait_for_terminate(pid_t pid, siginfo_t *status) { | |
3570 | siginfo_t dummy; | |
3571 | ||
3572 | assert(pid >= 1); | |
3573 | ||
3574 | if (!status) | |
3575 | status = &dummy; | |
3576 | ||
3577 | for (;;) { | |
3578 | zero(*status); | |
3579 | ||
3580 | if (waitid(P_PID, pid, status, WEXITED) < 0) { | |
3581 | ||
3582 | if (errno == EINTR) | |
3583 | continue; | |
3584 | ||
3585 | return -errno; | |
3586 | } | |
3587 | ||
3588 | return 0; | |
3589 | } | |
3590 | } | |
3591 | ||
e842803a MB |
3592 | /* |
3593 | * Return values: | |
3594 | * < 0 : wait_for_terminate() failed to get the state of the | |
3595 | * process, the process was terminated by a signal, or | |
3596 | * failed for an unknown reason. | |
3597 | * >=0 : The process terminated normally, and its exit code is | |
3598 | * returned. | |
3599 | * | |
3600 | * That is, success is indicated by a return value of zero, and an | |
3601 | * error is indicated by a non-zero value. | |
3602 | */ | |
663996b3 MS |
3603 | int wait_for_terminate_and_warn(const char *name, pid_t pid) { |
3604 | int r; | |
3605 | siginfo_t status; | |
3606 | ||
3607 | assert(name); | |
3608 | assert(pid > 1); | |
3609 | ||
3610 | r = wait_for_terminate(pid, &status); | |
3611 | if (r < 0) { | |
3612 | log_warning("Failed to wait for %s: %s", name, strerror(-r)); | |
3613 | return r; | |
3614 | } | |
3615 | ||
3616 | if (status.si_code == CLD_EXITED) { | |
3617 | if (status.si_status != 0) { | |
3618 | log_warning("%s failed with error code %i.", name, status.si_status); | |
3619 | return status.si_status; | |
3620 | } | |
3621 | ||
3622 | log_debug("%s succeeded.", name); | |
3623 | return 0; | |
3624 | ||
3625 | } else if (status.si_code == CLD_KILLED || | |
3626 | status.si_code == CLD_DUMPED) { | |
3627 | ||
3628 | log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status)); | |
3629 | return -EPROTO; | |
3630 | } | |
3631 | ||
3632 | log_warning("%s failed due to unknown reason.", name); | |
3633 | return -EPROTO; | |
3634 | } | |
3635 | ||
60f067b4 | 3636 | noreturn void freeze(void) { |
663996b3 MS |
3637 | |
3638 | /* Make sure nobody waits for us on a socket anymore */ | |
3639 | close_all_fds(NULL, 0); | |
3640 | ||
3641 | sync(); | |
3642 | ||
3643 | for (;;) | |
3644 | pause(); | |
3645 | } | |
3646 | ||
3647 | bool null_or_empty(struct stat *st) { | |
3648 | assert(st); | |
3649 | ||
3650 | if (S_ISREG(st->st_mode) && st->st_size <= 0) | |
3651 | return true; | |
3652 | ||
3653 | if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode)) | |
3654 | return true; | |
3655 | ||
3656 | return false; | |
3657 | } | |
3658 | ||
3659 | int null_or_empty_path(const char *fn) { | |
3660 | struct stat st; | |
3661 | ||
3662 | assert(fn); | |
3663 | ||
3664 | if (stat(fn, &st) < 0) | |
3665 | return -errno; | |
3666 | ||
3667 | return null_or_empty(&st); | |
3668 | } | |
3669 | ||
5eef597e MP |
3670 | int null_or_empty_fd(int fd) { |
3671 | struct stat st; | |
3672 | ||
3673 | assert(fd >= 0); | |
3674 | ||
3675 | if (fstat(fd, &st) < 0) | |
3676 | return -errno; | |
3677 | ||
3678 | return null_or_empty(&st); | |
3679 | } | |
3680 | ||
663996b3 MS |
3681 | DIR *xopendirat(int fd, const char *name, int flags) { |
3682 | int nfd; | |
3683 | DIR *d; | |
3684 | ||
14228c0d MB |
3685 | assert(!(flags & O_CREAT)); |
3686 | ||
3687 | nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags, 0); | |
663996b3 MS |
3688 | if (nfd < 0) |
3689 | return NULL; | |
3690 | ||
3691 | d = fdopendir(nfd); | |
3692 | if (!d) { | |
60f067b4 | 3693 | safe_close(nfd); |
663996b3 MS |
3694 | return NULL; |
3695 | } | |
3696 | ||
3697 | return d; | |
3698 | } | |
3699 | ||
3700 | int signal_from_string_try_harder(const char *s) { | |
3701 | int signo; | |
3702 | assert(s); | |
3703 | ||
3704 | signo = signal_from_string(s); | |
3705 | if (signo <= 0) | |
3706 | if (startswith(s, "SIG")) | |
3707 | return signal_from_string(s+3); | |
3708 | ||
3709 | return signo; | |
3710 | } | |
3711 | ||
3712 | static char *tag_to_udev_node(const char *tagvalue, const char *by) { | |
14228c0d | 3713 | _cleanup_free_ char *t = NULL, *u = NULL; |
14228c0d | 3714 | size_t enc_len; |
663996b3 MS |
3715 | |
3716 | u = unquote(tagvalue, "\"\'"); | |
60f067b4 | 3717 | if (!u) |
663996b3 MS |
3718 | return NULL; |
3719 | ||
60f067b4 | 3720 | enc_len = strlen(u) * 4 + 1; |
14228c0d | 3721 | t = new(char, enc_len); |
60f067b4 | 3722 | if (!t) |
663996b3 MS |
3723 | return NULL; |
3724 | ||
14228c0d MB |
3725 | if (encode_devnode_name(u, t, enc_len) < 0) |
3726 | return NULL; | |
663996b3 | 3727 | |
60f067b4 | 3728 | return strjoin("/dev/disk/by-", by, "/", t, NULL); |
663996b3 MS |
3729 | } |
3730 | ||
3731 | char *fstab_node_to_udev_node(const char *p) { | |
3732 | assert(p); | |
3733 | ||
3734 | if (startswith(p, "LABEL=")) | |
3735 | return tag_to_udev_node(p+6, "label"); | |
3736 | ||
3737 | if (startswith(p, "UUID=")) | |
3738 | return tag_to_udev_node(p+5, "uuid"); | |
3739 | ||
3740 | if (startswith(p, "PARTUUID=")) | |
3741 | return tag_to_udev_node(p+9, "partuuid"); | |
3742 | ||
3743 | if (startswith(p, "PARTLABEL=")) | |
3744 | return tag_to_udev_node(p+10, "partlabel"); | |
3745 | ||
3746 | return strdup(p); | |
3747 | } | |
3748 | ||
3749 | bool tty_is_vc(const char *tty) { | |
3750 | assert(tty); | |
3751 | ||
663996b3 MS |
3752 | return vtnr_from_tty(tty) >= 0; |
3753 | } | |
3754 | ||
3755 | bool tty_is_console(const char *tty) { | |
3756 | assert(tty); | |
3757 | ||
3758 | if (startswith(tty, "/dev/")) | |
3759 | tty += 5; | |
3760 | ||
3761 | return streq(tty, "console"); | |
3762 | } | |
3763 | ||
3764 | int vtnr_from_tty(const char *tty) { | |
3765 | int i, r; | |
3766 | ||
3767 | assert(tty); | |
3768 | ||
3769 | if (startswith(tty, "/dev/")) | |
3770 | tty += 5; | |
3771 | ||
3772 | if (!startswith(tty, "tty") ) | |
3773 | return -EINVAL; | |
3774 | ||
3775 | if (tty[3] < '0' || tty[3] > '9') | |
3776 | return -EINVAL; | |
3777 | ||
3778 | r = safe_atoi(tty+3, &i); | |
3779 | if (r < 0) | |
3780 | return r; | |
3781 | ||
3782 | if (i < 0 || i > 63) | |
3783 | return -EINVAL; | |
3784 | ||
3785 | return i; | |
3786 | } | |
3787 | ||
3788 | char *resolve_dev_console(char **active) { | |
3789 | char *tty; | |
3790 | ||
3791 | /* Resolve where /dev/console is pointing to, if /sys is actually ours | |
3792 | * (i.e. not read-only-mounted which is a sign for container setups) */ | |
3793 | ||
3794 | if (path_is_read_only_fs("/sys") > 0) | |
3795 | return NULL; | |
3796 | ||
3797 | if (read_one_line_file("/sys/class/tty/console/active", active) < 0) | |
3798 | return NULL; | |
3799 | ||
3800 | /* If multiple log outputs are configured the last one is what | |
3801 | * /dev/console points to */ | |
3802 | tty = strrchr(*active, ' '); | |
3803 | if (tty) | |
3804 | tty++; | |
3805 | else | |
3806 | tty = *active; | |
3807 | ||
60f067b4 JS |
3808 | if (streq(tty, "tty0")) { |
3809 | char *tmp; | |
3810 | ||
3811 | /* Get the active VC (e.g. tty1) */ | |
3812 | if (read_one_line_file("/sys/class/tty/tty0/active", &tmp) >= 0) { | |
3813 | free(*active); | |
3814 | tty = *active = tmp; | |
3815 | } | |
3816 | } | |
3817 | ||
663996b3 MS |
3818 | return tty; |
3819 | } | |
3820 | ||
3821 | bool tty_is_vc_resolve(const char *tty) { | |
60f067b4 | 3822 | _cleanup_free_ char *active = NULL; |
663996b3 MS |
3823 | |
3824 | assert(tty); | |
3825 | ||
3826 | if (startswith(tty, "/dev/")) | |
3827 | tty += 5; | |
3828 | ||
3829 | if (streq(tty, "console")) { | |
3830 | tty = resolve_dev_console(&active); | |
3831 | if (!tty) | |
3832 | return false; | |
3833 | } | |
3834 | ||
60f067b4 | 3835 | return tty_is_vc(tty); |
663996b3 MS |
3836 | } |
3837 | ||
3838 | const char *default_term_for_tty(const char *tty) { | |
3839 | assert(tty); | |
3840 | ||
3841 | return tty_is_vc_resolve(tty) ? "TERM=linux" : "TERM=vt102"; | |
3842 | } | |
3843 | ||
3844 | bool dirent_is_file(const struct dirent *de) { | |
3845 | assert(de); | |
3846 | ||
3847 | if (ignore_file(de->d_name)) | |
3848 | return false; | |
3849 | ||
3850 | if (de->d_type != DT_REG && | |
3851 | de->d_type != DT_LNK && | |
3852 | de->d_type != DT_UNKNOWN) | |
3853 | return false; | |
3854 | ||
3855 | return true; | |
3856 | } | |
3857 | ||
3858 | bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) { | |
3859 | assert(de); | |
3860 | ||
3861 | if (de->d_type != DT_REG && | |
3862 | de->d_type != DT_LNK && | |
3863 | de->d_type != DT_UNKNOWN) | |
3864 | return false; | |
3865 | ||
3866 | if (ignore_file_allow_backup(de->d_name)) | |
3867 | return false; | |
3868 | ||
3869 | return endswith(de->d_name, suffix); | |
3870 | } | |
3871 | ||
60f067b4 JS |
3872 | void execute_directory(const char *directory, DIR *d, usec_t timeout, char *argv[]) { |
3873 | pid_t executor_pid; | |
3874 | int r; | |
663996b3 MS |
3875 | |
3876 | assert(directory); | |
3877 | ||
60f067b4 JS |
3878 | /* Executes all binaries in a directory in parallel and waits |
3879 | * for them to finish. Optionally a timeout is applied. */ | |
663996b3 | 3880 | |
60f067b4 JS |
3881 | executor_pid = fork(); |
3882 | if (executor_pid < 0) { | |
3883 | log_error("Failed to fork: %m"); | |
3884 | return; | |
663996b3 | 3885 | |
60f067b4 JS |
3886 | } else if (executor_pid == 0) { |
3887 | _cleanup_hashmap_free_free_ Hashmap *pids = NULL; | |
3888 | _cleanup_closedir_ DIR *_d = NULL; | |
3889 | struct dirent *de; | |
663996b3 | 3890 | |
60f067b4 JS |
3891 | /* We fork this all off from a child process so that |
3892 | * we can somewhat cleanly make use of SIGALRM to set | |
3893 | * a time limit */ | |
663996b3 | 3894 | |
60f067b4 | 3895 | reset_all_signal_handlers(); |
5eef597e | 3896 | reset_signal_mask(); |
663996b3 | 3897 | |
60f067b4 | 3898 | assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0); |
663996b3 | 3899 | |
60f067b4 JS |
3900 | if (!d) { |
3901 | d = _d = opendir(directory); | |
3902 | if (!d) { | |
3903 | if (errno == ENOENT) | |
3904 | _exit(EXIT_SUCCESS); | |
663996b3 | 3905 | |
60f067b4 JS |
3906 | log_error("Failed to enumerate directory %s: %m", directory); |
3907 | _exit(EXIT_FAILURE); | |
3908 | } | |
663996b3 MS |
3909 | } |
3910 | ||
5eef597e | 3911 | pids = hashmap_new(NULL); |
60f067b4 JS |
3912 | if (!pids) { |
3913 | log_oom(); | |
3914 | _exit(EXIT_FAILURE); | |
663996b3 MS |
3915 | } |
3916 | ||
60f067b4 JS |
3917 | FOREACH_DIRENT(de, d, break) { |
3918 | _cleanup_free_ char *path = NULL; | |
3919 | pid_t pid; | |
663996b3 | 3920 | |
60f067b4 JS |
3921 | if (!dirent_is_file(de)) |
3922 | continue; | |
663996b3 | 3923 | |
5eef597e MP |
3924 | path = strjoin(directory, "/", de->d_name, NULL); |
3925 | if (!path) { | |
60f067b4 JS |
3926 | log_oom(); |
3927 | _exit(EXIT_FAILURE); | |
3928 | } | |
663996b3 | 3929 | |
60f067b4 JS |
3930 | pid = fork(); |
3931 | if (pid < 0) { | |
3932 | log_error("Failed to fork: %m"); | |
3933 | continue; | |
3934 | } else if (pid == 0) { | |
3935 | char *_argv[2]; | |
663996b3 | 3936 | |
60f067b4 | 3937 | assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0); |
663996b3 | 3938 | |
60f067b4 JS |
3939 | if (!argv) { |
3940 | _argv[0] = path; | |
3941 | _argv[1] = NULL; | |
3942 | argv = _argv; | |
3943 | } else | |
3944 | argv[0] = path; | |
663996b3 | 3945 | |
60f067b4 JS |
3946 | execv(path, argv); |
3947 | log_error("Failed to execute %s: %m", path); | |
3948 | _exit(EXIT_FAILURE); | |
3949 | } | |
663996b3 | 3950 | |
60f067b4 | 3951 | log_debug("Spawned %s as " PID_FMT ".", path, pid); |
663996b3 | 3952 | |
60f067b4 JS |
3953 | r = hashmap_put(pids, UINT_TO_PTR(pid), path); |
3954 | if (r < 0) { | |
3955 | log_oom(); | |
3956 | _exit(EXIT_FAILURE); | |
3957 | } | |
3958 | ||
3959 | path = NULL; | |
663996b3 MS |
3960 | } |
3961 | ||
60f067b4 JS |
3962 | /* Abort execution of this process after the |
3963 | * timout. We simply rely on SIGALRM as default action | |
3964 | * terminating the process, and turn on alarm(). */ | |
663996b3 | 3965 | |
5eef597e | 3966 | if (timeout != USEC_INFINITY) |
60f067b4 JS |
3967 | alarm((timeout + USEC_PER_SEC - 1) / USEC_PER_SEC); |
3968 | ||
3969 | while (!hashmap_isempty(pids)) { | |
3970 | _cleanup_free_ char *path = NULL; | |
3971 | pid_t pid; | |
3972 | ||
3973 | pid = PTR_TO_UINT(hashmap_first_key(pids)); | |
3974 | assert(pid > 0); | |
3975 | ||
3976 | path = hashmap_remove(pids, UINT_TO_PTR(pid)); | |
3977 | assert(path); | |
3978 | ||
3979 | wait_for_terminate_and_warn(path, pid); | |
663996b3 | 3980 | } |
663996b3 | 3981 | |
60f067b4 JS |
3982 | _exit(EXIT_SUCCESS); |
3983 | } | |
663996b3 | 3984 | |
60f067b4 | 3985 | wait_for_terminate_and_warn(directory, executor_pid); |
663996b3 MS |
3986 | } |
3987 | ||
3988 | int kill_and_sigcont(pid_t pid, int sig) { | |
3989 | int r; | |
3990 | ||
3991 | r = kill(pid, sig) < 0 ? -errno : 0; | |
3992 | ||
3993 | if (r >= 0) | |
3994 | kill(pid, SIGCONT); | |
3995 | ||
3996 | return r; | |
3997 | } | |
3998 | ||
3999 | bool nulstr_contains(const char*nulstr, const char *needle) { | |
4000 | const char *i; | |
4001 | ||
4002 | if (!nulstr) | |
4003 | return false; | |
4004 | ||
4005 | NULSTR_FOREACH(i, nulstr) | |
4006 | if (streq(i, needle)) | |
4007 | return true; | |
4008 | ||
4009 | return false; | |
4010 | } | |
4011 | ||
4012 | bool plymouth_running(void) { | |
4013 | return access("/run/plymouth/pid", F_OK) >= 0; | |
4014 | } | |
4015 | ||
4016 | char* strshorten(char *s, size_t l) { | |
4017 | assert(s); | |
4018 | ||
4019 | if (l < strlen(s)) | |
4020 | s[l] = 0; | |
4021 | ||
4022 | return s; | |
4023 | } | |
4024 | ||
4025 | static bool hostname_valid_char(char c) { | |
4026 | return | |
4027 | (c >= 'a' && c <= 'z') || | |
4028 | (c >= 'A' && c <= 'Z') || | |
4029 | (c >= '0' && c <= '9') || | |
4030 | c == '-' || | |
4031 | c == '_' || | |
4032 | c == '.'; | |
4033 | } | |
4034 | ||
4035 | bool hostname_is_valid(const char *s) { | |
4036 | const char *p; | |
4037 | bool dot; | |
4038 | ||
4039 | if (isempty(s)) | |
4040 | return false; | |
4041 | ||
4042 | for (p = s, dot = true; *p; p++) { | |
4043 | if (*p == '.') { | |
4044 | if (dot) | |
4045 | return false; | |
4046 | ||
4047 | dot = true; | |
4048 | } else { | |
4049 | if (!hostname_valid_char(*p)) | |
4050 | return false; | |
4051 | ||
4052 | dot = false; | |
4053 | } | |
4054 | } | |
4055 | ||
4056 | if (dot) | |
4057 | return false; | |
4058 | ||
4059 | if (p-s > HOST_NAME_MAX) | |
4060 | return false; | |
4061 | ||
4062 | return true; | |
4063 | } | |
4064 | ||
4065 | char* hostname_cleanup(char *s, bool lowercase) { | |
4066 | char *p, *d; | |
4067 | bool dot; | |
4068 | ||
4069 | for (p = s, d = s, dot = true; *p; p++) { | |
4070 | if (*p == '.') { | |
4071 | if (dot) | |
4072 | continue; | |
4073 | ||
4074 | *(d++) = '.'; | |
4075 | dot = true; | |
4076 | } else if (hostname_valid_char(*p)) { | |
4077 | *(d++) = lowercase ? tolower(*p) : *p; | |
4078 | dot = false; | |
4079 | } | |
4080 | ||
4081 | } | |
4082 | ||
4083 | if (dot && d > s) | |
4084 | d[-1] = 0; | |
4085 | else | |
4086 | *d = 0; | |
4087 | ||
4088 | strshorten(s, HOST_NAME_MAX); | |
4089 | ||
4090 | return s; | |
4091 | } | |
4092 | ||
e842803a MB |
4093 | bool machine_name_is_valid(const char *s) { |
4094 | ||
4095 | if (!hostname_is_valid(s)) | |
4096 | return false; | |
4097 | ||
4098 | /* Machine names should be useful hostnames, but also be | |
4099 | * useful in unit names, hence we enforce a stricter length | |
4100 | * limitation. */ | |
4101 | ||
4102 | if (strlen(s) > 64) | |
4103 | return false; | |
4104 | ||
4105 | return true; | |
4106 | } | |
4107 | ||
663996b3 | 4108 | int pipe_eof(int fd) { |
663996b3 MS |
4109 | struct pollfd pollfd = { |
4110 | .fd = fd, | |
4111 | .events = POLLIN|POLLHUP, | |
4112 | }; | |
4113 | ||
60f067b4 JS |
4114 | int r; |
4115 | ||
663996b3 MS |
4116 | r = poll(&pollfd, 1, 0); |
4117 | if (r < 0) | |
4118 | return -errno; | |
4119 | ||
4120 | if (r == 0) | |
4121 | return 0; | |
4122 | ||
4123 | return pollfd.revents & POLLHUP; | |
4124 | } | |
4125 | ||
4126 | int fd_wait_for_event(int fd, int event, usec_t t) { | |
60f067b4 | 4127 | |
663996b3 MS |
4128 | struct pollfd pollfd = { |
4129 | .fd = fd, | |
4130 | .events = event, | |
4131 | }; | |
4132 | ||
60f067b4 JS |
4133 | struct timespec ts; |
4134 | int r; | |
4135 | ||
5eef597e | 4136 | r = ppoll(&pollfd, 1, t == USEC_INFINITY ? NULL : timespec_store(&ts, t), NULL); |
663996b3 MS |
4137 | if (r < 0) |
4138 | return -errno; | |
4139 | ||
4140 | if (r == 0) | |
4141 | return 0; | |
4142 | ||
4143 | return pollfd.revents; | |
4144 | } | |
4145 | ||
4146 | int fopen_temporary(const char *path, FILE **_f, char **_temp_path) { | |
4147 | FILE *f; | |
4148 | char *t; | |
663996b3 MS |
4149 | int fd; |
4150 | ||
4151 | assert(path); | |
4152 | assert(_f); | |
4153 | assert(_temp_path); | |
4154 | ||
e842803a | 4155 | t = tempfn_xxxxxx(path); |
663996b3 MS |
4156 | if (!t) |
4157 | return -ENOMEM; | |
4158 | ||
60f067b4 | 4159 | fd = mkostemp_safe(t, O_WRONLY|O_CLOEXEC); |
663996b3 MS |
4160 | if (fd < 0) { |
4161 | free(t); | |
4162 | return -errno; | |
4163 | } | |
4164 | ||
4165 | f = fdopen(fd, "we"); | |
4166 | if (!f) { | |
4167 | unlink(t); | |
4168 | free(t); | |
4169 | return -errno; | |
4170 | } | |
4171 | ||
4172 | *_f = f; | |
4173 | *_temp_path = t; | |
4174 | ||
4175 | return 0; | |
4176 | } | |
4177 | ||
4178 | int terminal_vhangup_fd(int fd) { | |
4179 | assert(fd >= 0); | |
4180 | ||
4181 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
4182 | return -errno; | |
4183 | ||
4184 | return 0; | |
4185 | } | |
4186 | ||
4187 | int terminal_vhangup(const char *name) { | |
60f067b4 | 4188 | _cleanup_close_ int fd; |
663996b3 MS |
4189 | |
4190 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
4191 | if (fd < 0) | |
4192 | return fd; | |
4193 | ||
60f067b4 | 4194 | return terminal_vhangup_fd(fd); |
663996b3 MS |
4195 | } |
4196 | ||
4197 | int vt_disallocate(const char *name) { | |
4198 | int fd, r; | |
4199 | unsigned u; | |
4200 | ||
4201 | /* Deallocate the VT if possible. If not possible | |
4202 | * (i.e. because it is the active one), at least clear it | |
4203 | * entirely (including the scrollback buffer) */ | |
4204 | ||
4205 | if (!startswith(name, "/dev/")) | |
4206 | return -EINVAL; | |
4207 | ||
4208 | if (!tty_is_vc(name)) { | |
4209 | /* So this is not a VT. I guess we cannot deallocate | |
4210 | * it then. But let's at least clear the screen */ | |
4211 | ||
4212 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
4213 | if (fd < 0) | |
4214 | return fd; | |
4215 | ||
4216 | loop_write(fd, | |
4217 | "\033[r" /* clear scrolling region */ | |
4218 | "\033[H" /* move home */ | |
4219 | "\033[2J", /* clear screen */ | |
4220 | 10, false); | |
60f067b4 | 4221 | safe_close(fd); |
663996b3 MS |
4222 | |
4223 | return 0; | |
4224 | } | |
4225 | ||
4226 | if (!startswith(name, "/dev/tty")) | |
4227 | return -EINVAL; | |
4228 | ||
4229 | r = safe_atou(name+8, &u); | |
4230 | if (r < 0) | |
4231 | return r; | |
4232 | ||
4233 | if (u <= 0) | |
4234 | return -EINVAL; | |
4235 | ||
4236 | /* Try to deallocate */ | |
4237 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC); | |
4238 | if (fd < 0) | |
4239 | return fd; | |
4240 | ||
4241 | r = ioctl(fd, VT_DISALLOCATE, u); | |
60f067b4 | 4242 | safe_close(fd); |
663996b3 MS |
4243 | |
4244 | if (r >= 0) | |
4245 | return 0; | |
4246 | ||
4247 | if (errno != EBUSY) | |
4248 | return -errno; | |
4249 | ||
4250 | /* Couldn't deallocate, so let's clear it fully with | |
4251 | * scrollback */ | |
4252 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
4253 | if (fd < 0) | |
4254 | return fd; | |
4255 | ||
4256 | loop_write(fd, | |
4257 | "\033[r" /* clear scrolling region */ | |
4258 | "\033[H" /* move home */ | |
4259 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
4260 | 10, false); | |
60f067b4 | 4261 | safe_close(fd); |
663996b3 MS |
4262 | |
4263 | return 0; | |
4264 | } | |
4265 | ||
4266 | int symlink_atomic(const char *from, const char *to) { | |
e842803a | 4267 | _cleanup_free_ char *t = NULL; |
663996b3 MS |
4268 | |
4269 | assert(from); | |
4270 | assert(to); | |
4271 | ||
e842803a | 4272 | t = tempfn_random(to); |
663996b3 MS |
4273 | if (!t) |
4274 | return -ENOMEM; | |
4275 | ||
e842803a MB |
4276 | if (symlink(from, t) < 0) |
4277 | return -errno; | |
663996b3 | 4278 | |
e842803a MB |
4279 | if (rename(t, to) < 0) { |
4280 | unlink_noerrno(t); | |
4281 | return -errno; | |
663996b3 MS |
4282 | } |
4283 | ||
e842803a MB |
4284 | return 0; |
4285 | } | |
663996b3 | 4286 | |
e842803a MB |
4287 | int mknod_atomic(const char *path, mode_t mode, dev_t dev) { |
4288 | _cleanup_free_ char *t = NULL; | |
4289 | ||
4290 | assert(path); | |
4291 | ||
4292 | t = tempfn_random(path); | |
4293 | if (!t) | |
4294 | return -ENOMEM; | |
4295 | ||
4296 | if (mknod(t, mode, dev) < 0) | |
663996b3 MS |
4297 | return -errno; |
4298 | ||
e842803a MB |
4299 | if (rename(t, path) < 0) { |
4300 | unlink_noerrno(t); | |
4301 | return -errno; | |
4302 | } | |
4303 | ||
4304 | return 0; | |
4305 | } | |
4306 | ||
4307 | int mkfifo_atomic(const char *path, mode_t mode) { | |
4308 | _cleanup_free_ char *t = NULL; | |
4309 | ||
4310 | assert(path); | |
4311 | ||
4312 | t = tempfn_random(path); | |
4313 | if (!t) | |
4314 | return -ENOMEM; | |
4315 | ||
4316 | if (mkfifo(t, mode) < 0) | |
4317 | return -errno; | |
4318 | ||
4319 | if (rename(t, path) < 0) { | |
4320 | unlink_noerrno(t); | |
4321 | return -errno; | |
663996b3 MS |
4322 | } |
4323 | ||
4324 | return 0; | |
4325 | } | |
4326 | ||
4327 | bool display_is_local(const char *display) { | |
4328 | assert(display); | |
4329 | ||
4330 | return | |
4331 | display[0] == ':' && | |
4332 | display[1] >= '0' && | |
4333 | display[1] <= '9'; | |
4334 | } | |
4335 | ||
4336 | int socket_from_display(const char *display, char **path) { | |
4337 | size_t k; | |
4338 | char *f, *c; | |
4339 | ||
4340 | assert(display); | |
4341 | assert(path); | |
4342 | ||
4343 | if (!display_is_local(display)) | |
4344 | return -EINVAL; | |
4345 | ||
4346 | k = strspn(display+1, "0123456789"); | |
4347 | ||
60f067b4 | 4348 | f = new(char, strlen("/tmp/.X11-unix/X") + k + 1); |
663996b3 MS |
4349 | if (!f) |
4350 | return -ENOMEM; | |
4351 | ||
4352 | c = stpcpy(f, "/tmp/.X11-unix/X"); | |
4353 | memcpy(c, display+1, k); | |
4354 | c[k] = 0; | |
4355 | ||
4356 | *path = f; | |
4357 | ||
4358 | return 0; | |
4359 | } | |
4360 | ||
4361 | int get_user_creds( | |
4362 | const char **username, | |
4363 | uid_t *uid, gid_t *gid, | |
4364 | const char **home, | |
4365 | const char **shell) { | |
4366 | ||
4367 | struct passwd *p; | |
4368 | uid_t u; | |
4369 | ||
4370 | assert(username); | |
4371 | assert(*username); | |
4372 | ||
4373 | /* We enforce some special rules for uid=0: in order to avoid | |
4374 | * NSS lookups for root we hardcode its data. */ | |
4375 | ||
4376 | if (streq(*username, "root") || streq(*username, "0")) { | |
4377 | *username = "root"; | |
4378 | ||
4379 | if (uid) | |
4380 | *uid = 0; | |
4381 | ||
4382 | if (gid) | |
4383 | *gid = 0; | |
4384 | ||
4385 | if (home) | |
4386 | *home = "/root"; | |
4387 | ||
4388 | if (shell) | |
4389 | *shell = "/bin/sh"; | |
4390 | ||
4391 | return 0; | |
4392 | } | |
4393 | ||
4394 | if (parse_uid(*username, &u) >= 0) { | |
4395 | errno = 0; | |
4396 | p = getpwuid(u); | |
4397 | ||
4398 | /* If there are multiple users with the same id, make | |
4399 | * sure to leave $USER to the configured value instead | |
4400 | * of the first occurrence in the database. However if | |
4401 | * the uid was configured by a numeric uid, then let's | |
4402 | * pick the real username from /etc/passwd. */ | |
4403 | if (p) | |
4404 | *username = p->pw_name; | |
4405 | } else { | |
4406 | errno = 0; | |
4407 | p = getpwnam(*username); | |
4408 | } | |
4409 | ||
4410 | if (!p) | |
4411 | return errno > 0 ? -errno : -ESRCH; | |
4412 | ||
4413 | if (uid) | |
4414 | *uid = p->pw_uid; | |
4415 | ||
4416 | if (gid) | |
4417 | *gid = p->pw_gid; | |
4418 | ||
4419 | if (home) | |
4420 | *home = p->pw_dir; | |
4421 | ||
4422 | if (shell) | |
4423 | *shell = p->pw_shell; | |
4424 | ||
4425 | return 0; | |
4426 | } | |
4427 | ||
4428 | char* uid_to_name(uid_t uid) { | |
4429 | struct passwd *p; | |
4430 | char *r; | |
4431 | ||
4432 | if (uid == 0) | |
4433 | return strdup("root"); | |
4434 | ||
4435 | p = getpwuid(uid); | |
4436 | if (p) | |
4437 | return strdup(p->pw_name); | |
4438 | ||
60f067b4 | 4439 | if (asprintf(&r, UID_FMT, uid) < 0) |
663996b3 MS |
4440 | return NULL; |
4441 | ||
4442 | return r; | |
4443 | } | |
4444 | ||
4445 | char* gid_to_name(gid_t gid) { | |
4446 | struct group *p; | |
4447 | char *r; | |
4448 | ||
4449 | if (gid == 0) | |
4450 | return strdup("root"); | |
4451 | ||
4452 | p = getgrgid(gid); | |
4453 | if (p) | |
4454 | return strdup(p->gr_name); | |
4455 | ||
60f067b4 | 4456 | if (asprintf(&r, GID_FMT, gid) < 0) |
663996b3 MS |
4457 | return NULL; |
4458 | ||
4459 | return r; | |
4460 | } | |
4461 | ||
4462 | int get_group_creds(const char **groupname, gid_t *gid) { | |
4463 | struct group *g; | |
4464 | gid_t id; | |
4465 | ||
4466 | assert(groupname); | |
4467 | ||
4468 | /* We enforce some special rules for gid=0: in order to avoid | |
4469 | * NSS lookups for root we hardcode its data. */ | |
4470 | ||
4471 | if (streq(*groupname, "root") || streq(*groupname, "0")) { | |
4472 | *groupname = "root"; | |
4473 | ||
4474 | if (gid) | |
4475 | *gid = 0; | |
4476 | ||
4477 | return 0; | |
4478 | } | |
4479 | ||
4480 | if (parse_gid(*groupname, &id) >= 0) { | |
4481 | errno = 0; | |
4482 | g = getgrgid(id); | |
4483 | ||
4484 | if (g) | |
4485 | *groupname = g->gr_name; | |
4486 | } else { | |
4487 | errno = 0; | |
4488 | g = getgrnam(*groupname); | |
4489 | } | |
4490 | ||
4491 | if (!g) | |
4492 | return errno > 0 ? -errno : -ESRCH; | |
4493 | ||
4494 | if (gid) | |
4495 | *gid = g->gr_gid; | |
4496 | ||
4497 | return 0; | |
4498 | } | |
4499 | ||
4500 | int in_gid(gid_t gid) { | |
4501 | gid_t *gids; | |
4502 | int ngroups_max, r, i; | |
4503 | ||
4504 | if (getgid() == gid) | |
4505 | return 1; | |
4506 | ||
4507 | if (getegid() == gid) | |
4508 | return 1; | |
4509 | ||
4510 | ngroups_max = sysconf(_SC_NGROUPS_MAX); | |
4511 | assert(ngroups_max > 0); | |
4512 | ||
4513 | gids = alloca(sizeof(gid_t) * ngroups_max); | |
4514 | ||
4515 | r = getgroups(ngroups_max, gids); | |
4516 | if (r < 0) | |
4517 | return -errno; | |
4518 | ||
4519 | for (i = 0; i < r; i++) | |
4520 | if (gids[i] == gid) | |
4521 | return 1; | |
4522 | ||
4523 | return 0; | |
4524 | } | |
4525 | ||
4526 | int in_group(const char *name) { | |
4527 | int r; | |
4528 | gid_t gid; | |
4529 | ||
4530 | r = get_group_creds(&name, &gid); | |
4531 | if (r < 0) | |
4532 | return r; | |
4533 | ||
4534 | return in_gid(gid); | |
4535 | } | |
4536 | ||
4537 | int glob_exists(const char *path) { | |
4538 | _cleanup_globfree_ glob_t g = {}; | |
14228c0d | 4539 | int k; |
663996b3 MS |
4540 | |
4541 | assert(path); | |
4542 | ||
4543 | errno = 0; | |
4544 | k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g); | |
4545 | ||
4546 | if (k == GLOB_NOMATCH) | |
14228c0d | 4547 | return 0; |
663996b3 | 4548 | else if (k == GLOB_NOSPACE) |
14228c0d | 4549 | return -ENOMEM; |
663996b3 | 4550 | else if (k == 0) |
14228c0d | 4551 | return !strv_isempty(g.gl_pathv); |
663996b3 | 4552 | else |
14228c0d MB |
4553 | return errno ? -errno : -EIO; |
4554 | } | |
663996b3 | 4555 | |
14228c0d MB |
4556 | int glob_extend(char ***strv, const char *path) { |
4557 | _cleanup_globfree_ glob_t g = {}; | |
4558 | int k; | |
4559 | char **p; | |
4560 | ||
4561 | errno = 0; | |
60f067b4 | 4562 | k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g); |
14228c0d MB |
4563 | |
4564 | if (k == GLOB_NOMATCH) | |
4565 | return -ENOENT; | |
4566 | else if (k == GLOB_NOSPACE) | |
4567 | return -ENOMEM; | |
4568 | else if (k != 0 || strv_isempty(g.gl_pathv)) | |
4569 | return errno ? -errno : -EIO; | |
4570 | ||
4571 | STRV_FOREACH(p, g.gl_pathv) { | |
4572 | k = strv_extend(strv, *p); | |
4573 | if (k < 0) | |
4574 | break; | |
4575 | } | |
4576 | ||
4577 | return k; | |
663996b3 MS |
4578 | } |
4579 | ||
4580 | int dirent_ensure_type(DIR *d, struct dirent *de) { | |
4581 | struct stat st; | |
4582 | ||
4583 | assert(d); | |
4584 | assert(de); | |
4585 | ||
4586 | if (de->d_type != DT_UNKNOWN) | |
4587 | return 0; | |
4588 | ||
4589 | if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) | |
4590 | return -errno; | |
4591 | ||
4592 | de->d_type = | |
4593 | S_ISREG(st.st_mode) ? DT_REG : | |
4594 | S_ISDIR(st.st_mode) ? DT_DIR : | |
4595 | S_ISLNK(st.st_mode) ? DT_LNK : | |
4596 | S_ISFIFO(st.st_mode) ? DT_FIFO : | |
4597 | S_ISSOCK(st.st_mode) ? DT_SOCK : | |
4598 | S_ISCHR(st.st_mode) ? DT_CHR : | |
4599 | S_ISBLK(st.st_mode) ? DT_BLK : | |
4600 | DT_UNKNOWN; | |
4601 | ||
4602 | return 0; | |
4603 | } | |
4604 | ||
663996b3 | 4605 | int get_files_in_directory(const char *path, char ***list) { |
14228c0d MB |
4606 | _cleanup_closedir_ DIR *d = NULL; |
4607 | size_t bufsize = 0, n = 0; | |
4608 | _cleanup_strv_free_ char **l = NULL; | |
663996b3 MS |
4609 | |
4610 | assert(path); | |
4611 | ||
4612 | /* Returns all files in a directory in *list, and the number | |
4613 | * of files as return value. If list is NULL returns only the | |
14228c0d | 4614 | * number. */ |
663996b3 MS |
4615 | |
4616 | d = opendir(path); | |
4617 | if (!d) | |
4618 | return -errno; | |
4619 | ||
4620 | for (;;) { | |
4621 | struct dirent *de; | |
663996b3 | 4622 | |
60f067b4 JS |
4623 | errno = 0; |
4624 | de = readdir(d); | |
4625 | if (!de && errno != 0) | |
4626 | return -errno; | |
663996b3 MS |
4627 | if (!de) |
4628 | break; | |
4629 | ||
4630 | dirent_ensure_type(d, de); | |
4631 | ||
4632 | if (!dirent_is_file(de)) | |
4633 | continue; | |
4634 | ||
4635 | if (list) { | |
14228c0d MB |
4636 | /* one extra slot is needed for the terminating NULL */ |
4637 | if (!GREEDY_REALLOC(l, bufsize, n + 2)) | |
4638 | return -ENOMEM; | |
663996b3 | 4639 | |
14228c0d MB |
4640 | l[n] = strdup(de->d_name); |
4641 | if (!l[n]) | |
4642 | return -ENOMEM; | |
663996b3 | 4643 | |
14228c0d | 4644 | l[++n] = NULL; |
663996b3 | 4645 | } else |
14228c0d | 4646 | n++; |
663996b3 MS |
4647 | } |
4648 | ||
14228c0d MB |
4649 | if (list) { |
4650 | *list = l; | |
4651 | l = NULL; /* avoid freeing */ | |
4652 | } | |
663996b3 | 4653 | |
14228c0d | 4654 | return n; |
663996b3 MS |
4655 | } |
4656 | ||
4657 | char *strjoin(const char *x, ...) { | |
4658 | va_list ap; | |
4659 | size_t l; | |
4660 | char *r, *p; | |
4661 | ||
4662 | va_start(ap, x); | |
4663 | ||
4664 | if (x) { | |
4665 | l = strlen(x); | |
4666 | ||
4667 | for (;;) { | |
4668 | const char *t; | |
4669 | size_t n; | |
4670 | ||
4671 | t = va_arg(ap, const char *); | |
4672 | if (!t) | |
4673 | break; | |
4674 | ||
4675 | n = strlen(t); | |
4676 | if (n > ((size_t) -1) - l) { | |
4677 | va_end(ap); | |
4678 | return NULL; | |
4679 | } | |
4680 | ||
4681 | l += n; | |
4682 | } | |
4683 | } else | |
4684 | l = 0; | |
4685 | ||
4686 | va_end(ap); | |
4687 | ||
4688 | r = new(char, l+1); | |
4689 | if (!r) | |
4690 | return NULL; | |
4691 | ||
4692 | if (x) { | |
4693 | p = stpcpy(r, x); | |
4694 | ||
4695 | va_start(ap, x); | |
4696 | ||
4697 | for (;;) { | |
4698 | const char *t; | |
4699 | ||
4700 | t = va_arg(ap, const char *); | |
4701 | if (!t) | |
4702 | break; | |
4703 | ||
4704 | p = stpcpy(p, t); | |
4705 | } | |
4706 | ||
4707 | va_end(ap); | |
4708 | } else | |
4709 | r[0] = 0; | |
4710 | ||
4711 | return r; | |
4712 | } | |
4713 | ||
4714 | bool is_main_thread(void) { | |
60f067b4 | 4715 | static thread_local int cached = 0; |
663996b3 MS |
4716 | |
4717 | if (_unlikely_(cached == 0)) | |
4718 | cached = getpid() == gettid() ? 1 : -1; | |
4719 | ||
4720 | return cached > 0; | |
4721 | } | |
4722 | ||
4723 | int block_get_whole_disk(dev_t d, dev_t *ret) { | |
4724 | char *p, *s; | |
4725 | int r; | |
4726 | unsigned n, m; | |
4727 | ||
4728 | assert(ret); | |
4729 | ||
4730 | /* If it has a queue this is good enough for us */ | |
4731 | if (asprintf(&p, "/sys/dev/block/%u:%u/queue", major(d), minor(d)) < 0) | |
4732 | return -ENOMEM; | |
4733 | ||
4734 | r = access(p, F_OK); | |
4735 | free(p); | |
4736 | ||
4737 | if (r >= 0) { | |
4738 | *ret = d; | |
4739 | return 0; | |
4740 | } | |
4741 | ||
4742 | /* If it is a partition find the originating device */ | |
4743 | if (asprintf(&p, "/sys/dev/block/%u:%u/partition", major(d), minor(d)) < 0) | |
4744 | return -ENOMEM; | |
4745 | ||
4746 | r = access(p, F_OK); | |
4747 | free(p); | |
4748 | ||
4749 | if (r < 0) | |
4750 | return -ENOENT; | |
4751 | ||
4752 | /* Get parent dev_t */ | |
4753 | if (asprintf(&p, "/sys/dev/block/%u:%u/../dev", major(d), minor(d)) < 0) | |
4754 | return -ENOMEM; | |
4755 | ||
4756 | r = read_one_line_file(p, &s); | |
4757 | free(p); | |
4758 | ||
4759 | if (r < 0) | |
4760 | return r; | |
4761 | ||
4762 | r = sscanf(s, "%u:%u", &m, &n); | |
4763 | free(s); | |
4764 | ||
4765 | if (r != 2) | |
4766 | return -EINVAL; | |
4767 | ||
4768 | /* Only return this if it is really good enough for us. */ | |
4769 | if (asprintf(&p, "/sys/dev/block/%u:%u/queue", m, n) < 0) | |
4770 | return -ENOMEM; | |
4771 | ||
4772 | r = access(p, F_OK); | |
4773 | free(p); | |
4774 | ||
4775 | if (r >= 0) { | |
4776 | *ret = makedev(m, n); | |
4777 | return 0; | |
4778 | } | |
4779 | ||
4780 | return -ENOENT; | |
4781 | } | |
4782 | ||
4783 | int file_is_priv_sticky(const char *p) { | |
4784 | struct stat st; | |
4785 | ||
4786 | assert(p); | |
4787 | ||
4788 | if (lstat(p, &st) < 0) | |
4789 | return -errno; | |
4790 | ||
4791 | return | |
4792 | (st.st_uid == 0 || st.st_uid == getuid()) && | |
4793 | (st.st_mode & S_ISVTX); | |
4794 | } | |
4795 | ||
4796 | static const char *const ioprio_class_table[] = { | |
4797 | [IOPRIO_CLASS_NONE] = "none", | |
4798 | [IOPRIO_CLASS_RT] = "realtime", | |
4799 | [IOPRIO_CLASS_BE] = "best-effort", | |
4800 | [IOPRIO_CLASS_IDLE] = "idle" | |
4801 | }; | |
4802 | ||
4803 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ioprio_class, int, INT_MAX); | |
4804 | ||
4805 | static const char *const sigchld_code_table[] = { | |
4806 | [CLD_EXITED] = "exited", | |
4807 | [CLD_KILLED] = "killed", | |
4808 | [CLD_DUMPED] = "dumped", | |
4809 | [CLD_TRAPPED] = "trapped", | |
4810 | [CLD_STOPPED] = "stopped", | |
4811 | [CLD_CONTINUED] = "continued", | |
4812 | }; | |
4813 | ||
4814 | DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int); | |
4815 | ||
4816 | static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = { | |
4817 | [LOG_FAC(LOG_KERN)] = "kern", | |
4818 | [LOG_FAC(LOG_USER)] = "user", | |
4819 | [LOG_FAC(LOG_MAIL)] = "mail", | |
4820 | [LOG_FAC(LOG_DAEMON)] = "daemon", | |
4821 | [LOG_FAC(LOG_AUTH)] = "auth", | |
4822 | [LOG_FAC(LOG_SYSLOG)] = "syslog", | |
4823 | [LOG_FAC(LOG_LPR)] = "lpr", | |
4824 | [LOG_FAC(LOG_NEWS)] = "news", | |
4825 | [LOG_FAC(LOG_UUCP)] = "uucp", | |
4826 | [LOG_FAC(LOG_CRON)] = "cron", | |
4827 | [LOG_FAC(LOG_AUTHPRIV)] = "authpriv", | |
4828 | [LOG_FAC(LOG_FTP)] = "ftp", | |
4829 | [LOG_FAC(LOG_LOCAL0)] = "local0", | |
4830 | [LOG_FAC(LOG_LOCAL1)] = "local1", | |
4831 | [LOG_FAC(LOG_LOCAL2)] = "local2", | |
4832 | [LOG_FAC(LOG_LOCAL3)] = "local3", | |
4833 | [LOG_FAC(LOG_LOCAL4)] = "local4", | |
4834 | [LOG_FAC(LOG_LOCAL5)] = "local5", | |
4835 | [LOG_FAC(LOG_LOCAL6)] = "local6", | |
4836 | [LOG_FAC(LOG_LOCAL7)] = "local7" | |
4837 | }; | |
4838 | ||
4839 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_facility_unshifted, int, LOG_FAC(~0)); | |
4840 | ||
4841 | static const char *const log_level_table[] = { | |
4842 | [LOG_EMERG] = "emerg", | |
4843 | [LOG_ALERT] = "alert", | |
4844 | [LOG_CRIT] = "crit", | |
4845 | [LOG_ERR] = "err", | |
4846 | [LOG_WARNING] = "warning", | |
4847 | [LOG_NOTICE] = "notice", | |
4848 | [LOG_INFO] = "info", | |
4849 | [LOG_DEBUG] = "debug" | |
4850 | }; | |
4851 | ||
4852 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_level, int, LOG_DEBUG); | |
4853 | ||
4854 | static const char* const sched_policy_table[] = { | |
4855 | [SCHED_OTHER] = "other", | |
4856 | [SCHED_BATCH] = "batch", | |
4857 | [SCHED_IDLE] = "idle", | |
4858 | [SCHED_FIFO] = "fifo", | |
4859 | [SCHED_RR] = "rr" | |
4860 | }; | |
4861 | ||
4862 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(sched_policy, int, INT_MAX); | |
4863 | ||
60f067b4 | 4864 | static const char* const rlimit_table[_RLIMIT_MAX] = { |
663996b3 MS |
4865 | [RLIMIT_CPU] = "LimitCPU", |
4866 | [RLIMIT_FSIZE] = "LimitFSIZE", | |
4867 | [RLIMIT_DATA] = "LimitDATA", | |
4868 | [RLIMIT_STACK] = "LimitSTACK", | |
4869 | [RLIMIT_CORE] = "LimitCORE", | |
4870 | [RLIMIT_RSS] = "LimitRSS", | |
4871 | [RLIMIT_NOFILE] = "LimitNOFILE", | |
4872 | [RLIMIT_AS] = "LimitAS", | |
4873 | [RLIMIT_NPROC] = "LimitNPROC", | |
4874 | [RLIMIT_MEMLOCK] = "LimitMEMLOCK", | |
4875 | [RLIMIT_LOCKS] = "LimitLOCKS", | |
4876 | [RLIMIT_SIGPENDING] = "LimitSIGPENDING", | |
4877 | [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE", | |
4878 | [RLIMIT_NICE] = "LimitNICE", | |
4879 | [RLIMIT_RTPRIO] = "LimitRTPRIO", | |
4880 | [RLIMIT_RTTIME] = "LimitRTTIME" | |
4881 | }; | |
4882 | ||
4883 | DEFINE_STRING_TABLE_LOOKUP(rlimit, int); | |
4884 | ||
4885 | static const char* const ip_tos_table[] = { | |
4886 | [IPTOS_LOWDELAY] = "low-delay", | |
4887 | [IPTOS_THROUGHPUT] = "throughput", | |
4888 | [IPTOS_RELIABILITY] = "reliability", | |
4889 | [IPTOS_LOWCOST] = "low-cost", | |
4890 | }; | |
4891 | ||
4892 | DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ip_tos, int, 0xff); | |
4893 | ||
4894 | static const char *const __signal_table[] = { | |
4895 | [SIGHUP] = "HUP", | |
4896 | [SIGINT] = "INT", | |
4897 | [SIGQUIT] = "QUIT", | |
4898 | [SIGILL] = "ILL", | |
4899 | [SIGTRAP] = "TRAP", | |
4900 | [SIGABRT] = "ABRT", | |
4901 | [SIGBUS] = "BUS", | |
4902 | [SIGFPE] = "FPE", | |
4903 | [SIGKILL] = "KILL", | |
4904 | [SIGUSR1] = "USR1", | |
4905 | [SIGSEGV] = "SEGV", | |
4906 | [SIGUSR2] = "USR2", | |
4907 | [SIGPIPE] = "PIPE", | |
4908 | [SIGALRM] = "ALRM", | |
4909 | [SIGTERM] = "TERM", | |
4910 | #ifdef SIGSTKFLT | |
4911 | [SIGSTKFLT] = "STKFLT", /* Linux on SPARC doesn't know SIGSTKFLT */ | |
4912 | #endif | |
4913 | [SIGCHLD] = "CHLD", | |
4914 | [SIGCONT] = "CONT", | |
4915 | [SIGSTOP] = "STOP", | |
4916 | [SIGTSTP] = "TSTP", | |
4917 | [SIGTTIN] = "TTIN", | |
4918 | [SIGTTOU] = "TTOU", | |
4919 | [SIGURG] = "URG", | |
4920 | [SIGXCPU] = "XCPU", | |
4921 | [SIGXFSZ] = "XFSZ", | |
4922 | [SIGVTALRM] = "VTALRM", | |
4923 | [SIGPROF] = "PROF", | |
4924 | [SIGWINCH] = "WINCH", | |
4925 | [SIGIO] = "IO", | |
4926 | [SIGPWR] = "PWR", | |
4927 | [SIGSYS] = "SYS" | |
4928 | }; | |
4929 | ||
4930 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP(__signal, int); | |
4931 | ||
4932 | const char *signal_to_string(int signo) { | |
60f067b4 | 4933 | static thread_local char buf[sizeof("RTMIN+")-1 + DECIMAL_STR_MAX(int) + 1]; |
663996b3 MS |
4934 | const char *name; |
4935 | ||
4936 | name = __signal_to_string(signo); | |
4937 | if (name) | |
4938 | return name; | |
4939 | ||
4940 | if (signo >= SIGRTMIN && signo <= SIGRTMAX) | |
4941 | snprintf(buf, sizeof(buf), "RTMIN+%d", signo - SIGRTMIN); | |
4942 | else | |
4943 | snprintf(buf, sizeof(buf), "%d", signo); | |
4944 | ||
4945 | return buf; | |
4946 | } | |
4947 | ||
4948 | int signal_from_string(const char *s) { | |
4949 | int signo; | |
4950 | int offset = 0; | |
4951 | unsigned u; | |
4952 | ||
4953 | signo = __signal_from_string(s); | |
4954 | if (signo > 0) | |
4955 | return signo; | |
4956 | ||
4957 | if (startswith(s, "RTMIN+")) { | |
4958 | s += 6; | |
4959 | offset = SIGRTMIN; | |
4960 | } | |
4961 | if (safe_atou(s, &u) >= 0) { | |
4962 | signo = (int) u + offset; | |
4963 | if (signo > 0 && signo < _NSIG) | |
4964 | return signo; | |
4965 | } | |
5eef597e | 4966 | return -EINVAL; |
663996b3 MS |
4967 | } |
4968 | ||
4969 | bool kexec_loaded(void) { | |
4970 | bool loaded = false; | |
4971 | char *s; | |
4972 | ||
4973 | if (read_one_line_file("/sys/kernel/kexec_loaded", &s) >= 0) { | |
4974 | if (s[0] == '1') | |
4975 | loaded = true; | |
4976 | free(s); | |
4977 | } | |
4978 | return loaded; | |
4979 | } | |
4980 | ||
663996b3 MS |
4981 | int prot_from_flags(int flags) { |
4982 | ||
4983 | switch (flags & O_ACCMODE) { | |
4984 | ||
4985 | case O_RDONLY: | |
4986 | return PROT_READ; | |
4987 | ||
4988 | case O_WRONLY: | |
4989 | return PROT_WRITE; | |
4990 | ||
4991 | case O_RDWR: | |
4992 | return PROT_READ|PROT_WRITE; | |
4993 | ||
4994 | default: | |
4995 | return -EINVAL; | |
4996 | } | |
4997 | } | |
4998 | ||
4999 | char *format_bytes(char *buf, size_t l, off_t t) { | |
5000 | unsigned i; | |
5001 | ||
5002 | static const struct { | |
5003 | const char *suffix; | |
5004 | off_t factor; | |
5005 | } table[] = { | |
5006 | { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL }, | |
5007 | { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL }, | |
5008 | { "T", 1024ULL*1024ULL*1024ULL*1024ULL }, | |
5009 | { "G", 1024ULL*1024ULL*1024ULL }, | |
5010 | { "M", 1024ULL*1024ULL }, | |
5011 | { "K", 1024ULL }, | |
5012 | }; | |
5013 | ||
5014 | for (i = 0; i < ELEMENTSOF(table); i++) { | |
5015 | ||
5016 | if (t >= table[i].factor) { | |
5017 | snprintf(buf, l, | |
5018 | "%llu.%llu%s", | |
5019 | (unsigned long long) (t / table[i].factor), | |
5020 | (unsigned long long) (((t*10ULL) / table[i].factor) % 10ULL), | |
5021 | table[i].suffix); | |
5022 | ||
5023 | goto finish; | |
5024 | } | |
5025 | } | |
5026 | ||
5027 | snprintf(buf, l, "%lluB", (unsigned long long) t); | |
5028 | ||
5029 | finish: | |
5030 | buf[l-1] = 0; | |
5031 | return buf; | |
5032 | ||
5033 | } | |
5034 | ||
5035 | void* memdup(const void *p, size_t l) { | |
5036 | void *r; | |
5037 | ||
5038 | assert(p); | |
5039 | ||
5040 | r = malloc(l); | |
5041 | if (!r) | |
5042 | return NULL; | |
5043 | ||
5044 | memcpy(r, p, l); | |
5045 | return r; | |
5046 | } | |
5047 | ||
5048 | int fd_inc_sndbuf(int fd, size_t n) { | |
5049 | int r, value; | |
5050 | socklen_t l = sizeof(value); | |
5051 | ||
5052 | r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l); | |
60f067b4 | 5053 | if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) |
663996b3 MS |
5054 | return 0; |
5055 | ||
60f067b4 JS |
5056 | /* If we have the privileges we will ignore the kernel limit. */ |
5057 | ||
663996b3 | 5058 | value = (int) n; |
60f067b4 JS |
5059 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0) |
5060 | if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0) | |
5061 | return -errno; | |
663996b3 MS |
5062 | |
5063 | return 1; | |
5064 | } | |
5065 | ||
5066 | int fd_inc_rcvbuf(int fd, size_t n) { | |
5067 | int r, value; | |
5068 | socklen_t l = sizeof(value); | |
5069 | ||
5070 | r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l); | |
60f067b4 | 5071 | if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) |
663996b3 MS |
5072 | return 0; |
5073 | ||
60f067b4 | 5074 | /* If we have the privileges we will ignore the kernel limit. */ |
663996b3 | 5075 | |
60f067b4 JS |
5076 | value = (int) n; |
5077 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0) | |
5078 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0) | |
5079 | return -errno; | |
663996b3 MS |
5080 | return 1; |
5081 | } | |
5082 | ||
5083 | int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...) { | |
663996b3 | 5084 | bool stdout_is_tty, stderr_is_tty; |
5eef597e MP |
5085 | pid_t parent_pid, agent_pid; |
5086 | sigset_t ss, saved_ss; | |
663996b3 MS |
5087 | unsigned n, i; |
5088 | va_list ap; | |
5089 | char **l; | |
5090 | ||
5091 | assert(pid); | |
5092 | assert(path); | |
5093 | ||
663996b3 MS |
5094 | /* Spawns a temporary TTY agent, making sure it goes away when |
5095 | * we go away */ | |
5096 | ||
5eef597e MP |
5097 | parent_pid = getpid(); |
5098 | ||
5099 | /* First we temporarily block all signals, so that the new | |
5100 | * child has them blocked initially. This way, we can be sure | |
5101 | * that SIGTERMs are not lost we might send to the agent. */ | |
5102 | assert_se(sigfillset(&ss) >= 0); | |
5103 | assert_se(sigprocmask(SIG_SETMASK, &ss, &saved_ss) >= 0); | |
5104 | ||
663996b3 | 5105 | agent_pid = fork(); |
5eef597e MP |
5106 | if (agent_pid < 0) { |
5107 | assert_se(sigprocmask(SIG_SETMASK, &saved_ss, NULL) >= 0); | |
663996b3 | 5108 | return -errno; |
5eef597e | 5109 | } |
663996b3 MS |
5110 | |
5111 | if (agent_pid != 0) { | |
5eef597e | 5112 | assert_se(sigprocmask(SIG_SETMASK, &saved_ss, NULL) >= 0); |
663996b3 MS |
5113 | *pid = agent_pid; |
5114 | return 0; | |
5115 | } | |
5116 | ||
5117 | /* In the child: | |
5118 | * | |
5119 | * Make sure the agent goes away when the parent dies */ | |
5120 | if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) | |
5121 | _exit(EXIT_FAILURE); | |
5122 | ||
5eef597e MP |
5123 | /* Make sure we actually can kill the agent, if we need to, in |
5124 | * case somebody invoked us from a shell script that trapped | |
5125 | * SIGTERM or so... */ | |
5126 | reset_all_signal_handlers(); | |
5127 | reset_signal_mask(); | |
5128 | ||
663996b3 | 5129 | /* Check whether our parent died before we were able |
5eef597e | 5130 | * to set the death signal and unblock the signals */ |
663996b3 MS |
5131 | if (getppid() != parent_pid) |
5132 | _exit(EXIT_SUCCESS); | |
5133 | ||
5134 | /* Don't leak fds to the agent */ | |
5135 | close_all_fds(except, n_except); | |
5136 | ||
5137 | stdout_is_tty = isatty(STDOUT_FILENO); | |
5138 | stderr_is_tty = isatty(STDERR_FILENO); | |
5139 | ||
5140 | if (!stdout_is_tty || !stderr_is_tty) { | |
5eef597e MP |
5141 | int fd; |
5142 | ||
663996b3 MS |
5143 | /* Detach from stdout/stderr. and reopen |
5144 | * /dev/tty for them. This is important to | |
5145 | * ensure that when systemctl is started via | |
5146 | * popen() or a similar call that expects to | |
5147 | * read EOF we actually do generate EOF and | |
5148 | * not delay this indefinitely by because we | |
5149 | * keep an unused copy of stdin around. */ | |
5150 | fd = open("/dev/tty", O_WRONLY); | |
5151 | if (fd < 0) { | |
5152 | log_error("Failed to open /dev/tty: %m"); | |
5153 | _exit(EXIT_FAILURE); | |
5154 | } | |
5155 | ||
5156 | if (!stdout_is_tty) | |
5157 | dup2(fd, STDOUT_FILENO); | |
5158 | ||
5159 | if (!stderr_is_tty) | |
5160 | dup2(fd, STDERR_FILENO); | |
5161 | ||
5162 | if (fd > 2) | |
5163 | close(fd); | |
5164 | } | |
5165 | ||
5166 | /* Count arguments */ | |
5167 | va_start(ap, path); | |
5168 | for (n = 0; va_arg(ap, char*); n++) | |
5169 | ; | |
5170 | va_end(ap); | |
5171 | ||
5172 | /* Allocate strv */ | |
5173 | l = alloca(sizeof(char *) * (n + 1)); | |
5174 | ||
5175 | /* Fill in arguments */ | |
5176 | va_start(ap, path); | |
5177 | for (i = 0; i <= n; i++) | |
5178 | l[i] = va_arg(ap, char*); | |
5179 | va_end(ap); | |
5180 | ||
5181 | execv(path, l); | |
5182 | _exit(EXIT_FAILURE); | |
5183 | } | |
5184 | ||
5185 | int setrlimit_closest(int resource, const struct rlimit *rlim) { | |
5186 | struct rlimit highest, fixed; | |
5187 | ||
5188 | assert(rlim); | |
5189 | ||
5190 | if (setrlimit(resource, rlim) >= 0) | |
5191 | return 0; | |
5192 | ||
5193 | if (errno != EPERM) | |
5194 | return -errno; | |
5195 | ||
5196 | /* So we failed to set the desired setrlimit, then let's try | |
5197 | * to get as close as we can */ | |
5198 | assert_se(getrlimit(resource, &highest) == 0); | |
5199 | ||
5200 | fixed.rlim_cur = MIN(rlim->rlim_cur, highest.rlim_max); | |
5201 | fixed.rlim_max = MIN(rlim->rlim_max, highest.rlim_max); | |
5202 | ||
5203 | if (setrlimit(resource, &fixed) < 0) | |
5204 | return -errno; | |
5205 | ||
5206 | return 0; | |
5207 | } | |
5208 | ||
5209 | int getenv_for_pid(pid_t pid, const char *field, char **_value) { | |
5210 | _cleanup_fclose_ FILE *f = NULL; | |
5211 | char *value = NULL; | |
5212 | int r; | |
5213 | bool done = false; | |
5214 | size_t l; | |
5215 | const char *path; | |
5216 | ||
5217 | assert(pid >= 0); | |
5218 | assert(field); | |
5219 | assert(_value); | |
5220 | ||
60f067b4 | 5221 | path = procfs_file_alloca(pid, "environ"); |
663996b3 MS |
5222 | |
5223 | f = fopen(path, "re"); | |
5224 | if (!f) | |
5225 | return -errno; | |
5226 | ||
5227 | l = strlen(field); | |
5228 | r = 0; | |
5229 | ||
5230 | do { | |
5231 | char line[LINE_MAX]; | |
5232 | unsigned i; | |
5233 | ||
5234 | for (i = 0; i < sizeof(line)-1; i++) { | |
5235 | int c; | |
5236 | ||
5237 | c = getc(f); | |
5238 | if (_unlikely_(c == EOF)) { | |
5239 | done = true; | |
5240 | break; | |
5241 | } else if (c == 0) | |
5242 | break; | |
5243 | ||
5244 | line[i] = c; | |
5245 | } | |
5246 | line[i] = 0; | |
5247 | ||
5248 | if (memcmp(line, field, l) == 0 && line[l] == '=') { | |
5249 | value = strdup(line + l + 1); | |
5250 | if (!value) | |
5251 | return -ENOMEM; | |
5252 | ||
5253 | r = 1; | |
5254 | break; | |
5255 | } | |
5256 | ||
5257 | } while (!done); | |
5258 | ||
5259 | *_value = value; | |
5260 | return r; | |
5261 | } | |
5262 | ||
5263 | bool is_valid_documentation_url(const char *url) { | |
5264 | assert(url); | |
5265 | ||
5266 | if (startswith(url, "http://") && url[7]) | |
5267 | return true; | |
5268 | ||
5269 | if (startswith(url, "https://") && url[8]) | |
5270 | return true; | |
5271 | ||
5272 | if (startswith(url, "file:") && url[5]) | |
5273 | return true; | |
5274 | ||
5275 | if (startswith(url, "info:") && url[5]) | |
5276 | return true; | |
5277 | ||
5278 | if (startswith(url, "man:") && url[4]) | |
5279 | return true; | |
5280 | ||
5281 | return false; | |
5282 | } | |
5283 | ||
5284 | bool in_initrd(void) { | |
60f067b4 | 5285 | static int saved = -1; |
663996b3 MS |
5286 | struct statfs s; |
5287 | ||
5288 | if (saved >= 0) | |
5289 | return saved; | |
5290 | ||
5291 | /* We make two checks here: | |
5292 | * | |
5293 | * 1. the flag file /etc/initrd-release must exist | |
5294 | * 2. the root file system must be a memory file system | |
5295 | * | |
5296 | * The second check is extra paranoia, since misdetecting an | |
5297 | * initrd can have bad bad consequences due the initrd | |
5298 | * emptying when transititioning to the main systemd. | |
5299 | */ | |
5300 | ||
5301 | saved = access("/etc/initrd-release", F_OK) >= 0 && | |
5302 | statfs("/", &s) >= 0 && | |
5303 | is_temporary_fs(&s); | |
5304 | ||
5305 | return saved; | |
5306 | } | |
5307 | ||
5308 | void warn_melody(void) { | |
5309 | _cleanup_close_ int fd = -1; | |
5310 | ||
5311 | fd = open("/dev/console", O_WRONLY|O_CLOEXEC|O_NOCTTY); | |
5312 | if (fd < 0) | |
5313 | return; | |
5314 | ||
5315 | /* Yeah, this is synchronous. Kinda sucks. But well... */ | |
5316 | ||
5317 | ioctl(fd, KIOCSOUND, (int)(1193180/440)); | |
5318 | usleep(125*USEC_PER_MSEC); | |
5319 | ||
5320 | ioctl(fd, KIOCSOUND, (int)(1193180/220)); | |
5321 | usleep(125*USEC_PER_MSEC); | |
5322 | ||
5323 | ioctl(fd, KIOCSOUND, (int)(1193180/220)); | |
5324 | usleep(125*USEC_PER_MSEC); | |
5325 | ||
5326 | ioctl(fd, KIOCSOUND, 0); | |
5327 | } | |
5328 | ||
5329 | int make_console_stdio(void) { | |
5330 | int fd, r; | |
5331 | ||
5332 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr */ | |
5333 | ||
5eef597e | 5334 | fd = acquire_terminal("/dev/console", false, true, true, USEC_INFINITY); |
663996b3 MS |
5335 | if (fd < 0) { |
5336 | log_error("Failed to acquire terminal: %s", strerror(-fd)); | |
5337 | return fd; | |
5338 | } | |
5339 | ||
5340 | r = make_stdio(fd); | |
5341 | if (r < 0) { | |
5342 | log_error("Failed to duplicate terminal fd: %s", strerror(-r)); | |
5343 | return r; | |
5344 | } | |
5345 | ||
5346 | return 0; | |
5347 | } | |
5348 | ||
5349 | int get_home_dir(char **_h) { | |
60f067b4 | 5350 | struct passwd *p; |
663996b3 | 5351 | const char *e; |
60f067b4 | 5352 | char *h; |
663996b3 | 5353 | uid_t u; |
663996b3 MS |
5354 | |
5355 | assert(_h); | |
5356 | ||
5357 | /* Take the user specified one */ | |
e842803a MB |
5358 | e = secure_getenv("HOME"); |
5359 | if (e && path_is_absolute(e)) { | |
663996b3 MS |
5360 | h = strdup(e); |
5361 | if (!h) | |
5362 | return -ENOMEM; | |
5363 | ||
5364 | *_h = h; | |
5365 | return 0; | |
5366 | } | |
5367 | ||
5368 | /* Hardcode home directory for root to avoid NSS */ | |
5369 | u = getuid(); | |
5370 | if (u == 0) { | |
5371 | h = strdup("/root"); | |
5372 | if (!h) | |
5373 | return -ENOMEM; | |
5374 | ||
5375 | *_h = h; | |
5376 | return 0; | |
5377 | } | |
5378 | ||
5379 | /* Check the database... */ | |
5380 | errno = 0; | |
5381 | p = getpwuid(u); | |
5382 | if (!p) | |
5383 | return errno > 0 ? -errno : -ESRCH; | |
5384 | ||
5385 | if (!path_is_absolute(p->pw_dir)) | |
5386 | return -EINVAL; | |
5387 | ||
5388 | h = strdup(p->pw_dir); | |
5389 | if (!h) | |
5390 | return -ENOMEM; | |
5391 | ||
5392 | *_h = h; | |
5393 | return 0; | |
5394 | } | |
5395 | ||
60f067b4 JS |
5396 | int get_shell(char **_s) { |
5397 | struct passwd *p; | |
5398 | const char *e; | |
5399 | char *s; | |
5400 | uid_t u; | |
5401 | ||
5402 | assert(_s); | |
5403 | ||
5404 | /* Take the user specified one */ | |
5405 | e = getenv("SHELL"); | |
5406 | if (e) { | |
5407 | s = strdup(e); | |
5408 | if (!s) | |
5409 | return -ENOMEM; | |
5410 | ||
5411 | *_s = s; | |
5412 | return 0; | |
5413 | } | |
5414 | ||
5415 | /* Hardcode home directory for root to avoid NSS */ | |
5416 | u = getuid(); | |
5417 | if (u == 0) { | |
5418 | s = strdup("/bin/sh"); | |
5419 | if (!s) | |
5420 | return -ENOMEM; | |
5421 | ||
5422 | *_s = s; | |
5423 | return 0; | |
5424 | } | |
5425 | ||
5426 | /* Check the database... */ | |
5427 | errno = 0; | |
5428 | p = getpwuid(u); | |
5429 | if (!p) | |
5430 | return errno > 0 ? -errno : -ESRCH; | |
5431 | ||
5432 | if (!path_is_absolute(p->pw_shell)) | |
5433 | return -EINVAL; | |
5434 | ||
5435 | s = strdup(p->pw_shell); | |
5436 | if (!s) | |
5437 | return -ENOMEM; | |
5438 | ||
5439 | *_s = s; | |
5440 | return 0; | |
5441 | } | |
5442 | ||
663996b3 MS |
5443 | bool filename_is_safe(const char *p) { |
5444 | ||
5445 | if (isempty(p)) | |
5446 | return false; | |
5447 | ||
5448 | if (strchr(p, '/')) | |
5449 | return false; | |
5450 | ||
5451 | if (streq(p, ".")) | |
5452 | return false; | |
5453 | ||
5454 | if (streq(p, "..")) | |
5455 | return false; | |
5456 | ||
5457 | if (strlen(p) > FILENAME_MAX) | |
5458 | return false; | |
5459 | ||
5460 | return true; | |
5461 | } | |
5462 | ||
5463 | bool string_is_safe(const char *p) { | |
5464 | const char *t; | |
5465 | ||
5eef597e MP |
5466 | if (!p) |
5467 | return false; | |
663996b3 MS |
5468 | |
5469 | for (t = p; *t; t++) { | |
5470 | if (*t > 0 && *t < ' ') | |
5471 | return false; | |
5472 | ||
5eef597e | 5473 | if (strchr("\\\"\'\0x7f", *t)) |
663996b3 MS |
5474 | return false; |
5475 | } | |
5476 | ||
5477 | return true; | |
5478 | } | |
5479 | ||
14228c0d | 5480 | /** |
5eef597e MP |
5481 | * Check if a string contains control characters. If 'ok' is non-NULL |
5482 | * it may be a string containing additional CCs to be considered OK. | |
14228c0d | 5483 | */ |
5eef597e | 5484 | bool string_has_cc(const char *p, const char *ok) { |
663996b3 MS |
5485 | const char *t; |
5486 | ||
5487 | assert(p); | |
5488 | ||
5eef597e MP |
5489 | for (t = p; *t; t++) { |
5490 | if (ok && strchr(ok, *t)) | |
5491 | continue; | |
5492 | ||
5493 | if (*t > 0 && *t < ' ') | |
663996b3 MS |
5494 | return true; |
5495 | ||
5eef597e MP |
5496 | if (*t == 127) |
5497 | return true; | |
5498 | } | |
5499 | ||
663996b3 MS |
5500 | return false; |
5501 | } | |
5502 | ||
5503 | bool path_is_safe(const char *p) { | |
5504 | ||
5505 | if (isempty(p)) | |
5506 | return false; | |
5507 | ||
5508 | if (streq(p, "..") || startswith(p, "../") || endswith(p, "/..") || strstr(p, "/../")) | |
5509 | return false; | |
5510 | ||
5511 | if (strlen(p) > PATH_MAX) | |
5512 | return false; | |
5513 | ||
5514 | /* The following two checks are not really dangerous, but hey, they still are confusing */ | |
5515 | if (streq(p, ".") || startswith(p, "./") || endswith(p, "/.") || strstr(p, "/./")) | |
5516 | return false; | |
5517 | ||
5518 | if (strstr(p, "//")) | |
5519 | return false; | |
5520 | ||
5521 | return true; | |
5522 | } | |
5523 | ||
5524 | /* hey glibc, APIs with callbacks without a user pointer are so useless */ | |
5525 | void *xbsearch_r(const void *key, const void *base, size_t nmemb, size_t size, | |
5526 | int (*compar) (const void *, const void *, void *), void *arg) { | |
5527 | size_t l, u, idx; | |
5528 | const void *p; | |
5529 | int comparison; | |
5530 | ||
5531 | l = 0; | |
5532 | u = nmemb; | |
5533 | while (l < u) { | |
5534 | idx = (l + u) / 2; | |
5535 | p = (void *)(((const char *) base) + (idx * size)); | |
5536 | comparison = compar(key, p, arg); | |
5537 | if (comparison < 0) | |
5538 | u = idx; | |
5539 | else if (comparison > 0) | |
5540 | l = idx + 1; | |
5541 | else | |
5542 | return (void *)p; | |
5543 | } | |
5544 | return NULL; | |
5545 | } | |
5546 | ||
5547 | bool is_locale_utf8(void) { | |
5548 | const char *set; | |
5549 | static int cached_answer = -1; | |
5550 | ||
5551 | if (cached_answer >= 0) | |
5552 | goto out; | |
5553 | ||
5554 | if (!setlocale(LC_ALL, "")) { | |
5555 | cached_answer = true; | |
5556 | goto out; | |
5557 | } | |
5558 | ||
5559 | set = nl_langinfo(CODESET); | |
5560 | if (!set) { | |
5561 | cached_answer = true; | |
5562 | goto out; | |
5563 | } | |
5564 | ||
60f067b4 | 5565 | if (streq(set, "UTF-8")) { |
663996b3 MS |
5566 | cached_answer = true; |
5567 | goto out; | |
5568 | } | |
5569 | ||
14228c0d MB |
5570 | /* For LC_CTYPE=="C" return true, because CTYPE is effectly |
5571 | * unset and everything can do to UTF-8 nowadays. */ | |
663996b3 MS |
5572 | set = setlocale(LC_CTYPE, NULL); |
5573 | if (!set) { | |
5574 | cached_answer = true; | |
5575 | goto out; | |
5576 | } | |
5577 | ||
14228c0d MB |
5578 | /* Check result, but ignore the result if C was set |
5579 | * explicitly. */ | |
5580 | cached_answer = | |
5581 | streq(set, "C") && | |
5582 | !getenv("LC_ALL") && | |
5583 | !getenv("LC_CTYPE") && | |
5584 | !getenv("LANG"); | |
663996b3 MS |
5585 | |
5586 | out: | |
14228c0d | 5587 | return (bool) cached_answer; |
663996b3 MS |
5588 | } |
5589 | ||
5590 | const char *draw_special_char(DrawSpecialChar ch) { | |
5591 | static const char *draw_table[2][_DRAW_SPECIAL_CHAR_MAX] = { | |
60f067b4 | 5592 | |
663996b3 | 5593 | /* UTF-8 */ { |
60f067b4 | 5594 | [DRAW_TREE_VERTICAL] = "\342\224\202 ", /* │ */ |
663996b3 MS |
5595 | [DRAW_TREE_BRANCH] = "\342\224\234\342\224\200", /* ├─ */ |
5596 | [DRAW_TREE_RIGHT] = "\342\224\224\342\224\200", /* └─ */ | |
5597 | [DRAW_TREE_SPACE] = " ", /* */ | |
60f067b4 JS |
5598 | [DRAW_TRIANGULAR_BULLET] = "\342\200\243", /* ‣ */ |
5599 | [DRAW_BLACK_CIRCLE] = "\342\227\217", /* ● */ | |
5600 | [DRAW_ARROW] = "\342\206\222", /* → */ | |
5601 | [DRAW_DASH] = "\342\200\223", /* – */ | |
663996b3 | 5602 | }, |
60f067b4 | 5603 | |
663996b3 | 5604 | /* ASCII fallback */ { |
60f067b4 | 5605 | [DRAW_TREE_VERTICAL] = "| ", |
663996b3 MS |
5606 | [DRAW_TREE_BRANCH] = "|-", |
5607 | [DRAW_TREE_RIGHT] = "`-", | |
5608 | [DRAW_TREE_SPACE] = " ", | |
60f067b4 JS |
5609 | [DRAW_TRIANGULAR_BULLET] = ">", |
5610 | [DRAW_BLACK_CIRCLE] = "*", | |
5611 | [DRAW_ARROW] = "->", | |
5612 | [DRAW_DASH] = "-", | |
663996b3 MS |
5613 | } |
5614 | }; | |
5615 | ||
5616 | return draw_table[!is_locale_utf8()][ch]; | |
5617 | } | |
5618 | ||
5619 | char *strreplace(const char *text, const char *old_string, const char *new_string) { | |
5620 | const char *f; | |
5621 | char *t, *r; | |
5622 | size_t l, old_len, new_len; | |
5623 | ||
5624 | assert(text); | |
5625 | assert(old_string); | |
5626 | assert(new_string); | |
5627 | ||
5628 | old_len = strlen(old_string); | |
5629 | new_len = strlen(new_string); | |
5630 | ||
5631 | l = strlen(text); | |
5632 | r = new(char, l+1); | |
5633 | if (!r) | |
5634 | return NULL; | |
5635 | ||
5636 | f = text; | |
5637 | t = r; | |
5638 | while (*f) { | |
5639 | char *a; | |
5640 | size_t d, nl; | |
5641 | ||
5642 | if (!startswith(f, old_string)) { | |
5643 | *(t++) = *(f++); | |
5644 | continue; | |
5645 | } | |
5646 | ||
5647 | d = t - r; | |
5648 | nl = l - old_len + new_len; | |
5649 | a = realloc(r, nl + 1); | |
5650 | if (!a) | |
5651 | goto oom; | |
5652 | ||
5653 | l = nl; | |
5654 | r = a; | |
5655 | t = r + d; | |
5656 | ||
5657 | t = stpcpy(t, new_string); | |
5658 | f += old_len; | |
5659 | } | |
5660 | ||
5661 | *t = 0; | |
5662 | return r; | |
5663 | ||
5664 | oom: | |
5665 | free(r); | |
5666 | return NULL; | |
5667 | } | |
5668 | ||
5669 | char *strip_tab_ansi(char **ibuf, size_t *_isz) { | |
5670 | const char *i, *begin = NULL; | |
5671 | enum { | |
5672 | STATE_OTHER, | |
5673 | STATE_ESCAPE, | |
5674 | STATE_BRACKET | |
5675 | } state = STATE_OTHER; | |
5676 | char *obuf = NULL; | |
5677 | size_t osz = 0, isz; | |
5678 | FILE *f; | |
5679 | ||
5680 | assert(ibuf); | |
5681 | assert(*ibuf); | |
5682 | ||
5683 | /* Strips ANSI color and replaces TABs by 8 spaces */ | |
5684 | ||
5685 | isz = _isz ? *_isz : strlen(*ibuf); | |
5686 | ||
5687 | f = open_memstream(&obuf, &osz); | |
5688 | if (!f) | |
5689 | return NULL; | |
5690 | ||
5691 | for (i = *ibuf; i < *ibuf + isz + 1; i++) { | |
5692 | ||
5693 | switch (state) { | |
5694 | ||
5695 | case STATE_OTHER: | |
5696 | if (i >= *ibuf + isz) /* EOT */ | |
5697 | break; | |
5698 | else if (*i == '\x1B') | |
5699 | state = STATE_ESCAPE; | |
5700 | else if (*i == '\t') | |
5701 | fputs(" ", f); | |
5702 | else | |
5703 | fputc(*i, f); | |
5704 | break; | |
5705 | ||
5706 | case STATE_ESCAPE: | |
5707 | if (i >= *ibuf + isz) { /* EOT */ | |
5708 | fputc('\x1B', f); | |
5709 | break; | |
5710 | } else if (*i == '[') { | |
5711 | state = STATE_BRACKET; | |
5712 | begin = i + 1; | |
5713 | } else { | |
5714 | fputc('\x1B', f); | |
5715 | fputc(*i, f); | |
5716 | state = STATE_OTHER; | |
5717 | } | |
5718 | ||
5719 | break; | |
5720 | ||
5721 | case STATE_BRACKET: | |
5722 | ||
5723 | if (i >= *ibuf + isz || /* EOT */ | |
5724 | (!(*i >= '0' && *i <= '9') && *i != ';' && *i != 'm')) { | |
5725 | fputc('\x1B', f); | |
5726 | fputc('[', f); | |
5727 | state = STATE_OTHER; | |
5728 | i = begin-1; | |
5729 | } else if (*i == 'm') | |
5730 | state = STATE_OTHER; | |
5731 | break; | |
5732 | } | |
5733 | } | |
5734 | ||
5735 | if (ferror(f)) { | |
5736 | fclose(f); | |
5737 | free(obuf); | |
5738 | return NULL; | |
5739 | } | |
5740 | ||
5741 | fclose(f); | |
5742 | ||
5743 | free(*ibuf); | |
5744 | *ibuf = obuf; | |
5745 | ||
5746 | if (_isz) | |
5747 | *_isz = osz; | |
5748 | ||
5749 | return obuf; | |
5750 | } | |
5751 | ||
5752 | int on_ac_power(void) { | |
5753 | bool found_offline = false, found_online = false; | |
5754 | _cleanup_closedir_ DIR *d = NULL; | |
5755 | ||
5756 | d = opendir("/sys/class/power_supply"); | |
5757 | if (!d) | |
5758 | return -errno; | |
5759 | ||
5760 | for (;;) { | |
5761 | struct dirent *de; | |
663996b3 MS |
5762 | _cleanup_close_ int fd = -1, device = -1; |
5763 | char contents[6]; | |
5764 | ssize_t n; | |
663996b3 | 5765 | |
60f067b4 JS |
5766 | errno = 0; |
5767 | de = readdir(d); | |
5768 | if (!de && errno != 0) | |
5769 | return -errno; | |
663996b3 MS |
5770 | |
5771 | if (!de) | |
5772 | break; | |
5773 | ||
5774 | if (ignore_file(de->d_name)) | |
5775 | continue; | |
5776 | ||
5777 | device = openat(dirfd(d), de->d_name, O_DIRECTORY|O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
5778 | if (device < 0) { | |
5779 | if (errno == ENOENT || errno == ENOTDIR) | |
5780 | continue; | |
5781 | ||
5782 | return -errno; | |
5783 | } | |
5784 | ||
5785 | fd = openat(device, "type", O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
5786 | if (fd < 0) { | |
5787 | if (errno == ENOENT) | |
5788 | continue; | |
5789 | ||
5790 | return -errno; | |
5791 | } | |
5792 | ||
5793 | n = read(fd, contents, sizeof(contents)); | |
5794 | if (n < 0) | |
5795 | return -errno; | |
5796 | ||
5797 | if (n != 6 || memcmp(contents, "Mains\n", 6)) | |
5798 | continue; | |
5799 | ||
60f067b4 | 5800 | safe_close(fd); |
663996b3 MS |
5801 | fd = openat(device, "online", O_RDONLY|O_CLOEXEC|O_NOCTTY); |
5802 | if (fd < 0) { | |
5803 | if (errno == ENOENT) | |
5804 | continue; | |
5805 | ||
5806 | return -errno; | |
5807 | } | |
5808 | ||
5809 | n = read(fd, contents, sizeof(contents)); | |
5810 | if (n < 0) | |
5811 | return -errno; | |
5812 | ||
5813 | if (n != 2 || contents[1] != '\n') | |
5814 | return -EIO; | |
5815 | ||
5816 | if (contents[0] == '1') { | |
5817 | found_online = true; | |
5818 | break; | |
5819 | } else if (contents[0] == '0') | |
5820 | found_offline = true; | |
5821 | else | |
5822 | return -EIO; | |
5823 | } | |
5824 | ||
5825 | return found_online || !found_offline; | |
5826 | } | |
5827 | ||
60f067b4 | 5828 | static int search_and_fopen_internal(const char *path, const char *mode, const char *root, char **search, FILE **_f) { |
663996b3 MS |
5829 | char **i; |
5830 | ||
5831 | assert(path); | |
5832 | assert(mode); | |
5833 | assert(_f); | |
5834 | ||
e842803a | 5835 | if (!path_strv_resolve_uniq(search, root)) |
663996b3 MS |
5836 | return -ENOMEM; |
5837 | ||
5838 | STRV_FOREACH(i, search) { | |
5839 | _cleanup_free_ char *p = NULL; | |
5840 | FILE *f; | |
5841 | ||
e842803a MB |
5842 | if (root) |
5843 | p = strjoin(root, *i, "/", path, NULL); | |
5844 | else | |
5845 | p = strjoin(*i, "/", path, NULL); | |
663996b3 MS |
5846 | if (!p) |
5847 | return -ENOMEM; | |
5848 | ||
5849 | f = fopen(p, mode); | |
5850 | if (f) { | |
5851 | *_f = f; | |
5852 | return 0; | |
5853 | } | |
5854 | ||
5855 | if (errno != ENOENT) | |
5856 | return -errno; | |
5857 | } | |
5858 | ||
5859 | return -ENOENT; | |
5860 | } | |
5861 | ||
60f067b4 | 5862 | int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f) { |
663996b3 MS |
5863 | _cleanup_strv_free_ char **copy = NULL; |
5864 | ||
5865 | assert(path); | |
5866 | assert(mode); | |
5867 | assert(_f); | |
5868 | ||
5869 | if (path_is_absolute(path)) { | |
5870 | FILE *f; | |
5871 | ||
5872 | f = fopen(path, mode); | |
5873 | if (f) { | |
5874 | *_f = f; | |
5875 | return 0; | |
5876 | } | |
5877 | ||
5878 | return -errno; | |
5879 | } | |
5880 | ||
5881 | copy = strv_copy((char**) search); | |
5882 | if (!copy) | |
5883 | return -ENOMEM; | |
5884 | ||
60f067b4 | 5885 | return search_and_fopen_internal(path, mode, root, copy, _f); |
663996b3 MS |
5886 | } |
5887 | ||
60f067b4 | 5888 | int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f) { |
663996b3 MS |
5889 | _cleanup_strv_free_ char **s = NULL; |
5890 | ||
5891 | if (path_is_absolute(path)) { | |
5892 | FILE *f; | |
5893 | ||
5894 | f = fopen(path, mode); | |
5895 | if (f) { | |
5896 | *_f = f; | |
5897 | return 0; | |
5898 | } | |
5899 | ||
5900 | return -errno; | |
5901 | } | |
5902 | ||
5903 | s = strv_split_nulstr(search); | |
5904 | if (!s) | |
5905 | return -ENOMEM; | |
5906 | ||
60f067b4 | 5907 | return search_and_fopen_internal(path, mode, root, s, _f); |
663996b3 MS |
5908 | } |
5909 | ||
5910 | char *strextend(char **x, ...) { | |
5911 | va_list ap; | |
5912 | size_t f, l; | |
5913 | char *r, *p; | |
5914 | ||
5915 | assert(x); | |
5916 | ||
5917 | l = f = *x ? strlen(*x) : 0; | |
5918 | ||
5919 | va_start(ap, x); | |
5920 | for (;;) { | |
5921 | const char *t; | |
5922 | size_t n; | |
5923 | ||
5924 | t = va_arg(ap, const char *); | |
5925 | if (!t) | |
5926 | break; | |
5927 | ||
5928 | n = strlen(t); | |
5929 | if (n > ((size_t) -1) - l) { | |
5930 | va_end(ap); | |
5931 | return NULL; | |
5932 | } | |
5933 | ||
5934 | l += n; | |
5935 | } | |
5936 | va_end(ap); | |
5937 | ||
5938 | r = realloc(*x, l+1); | |
5939 | if (!r) | |
5940 | return NULL; | |
5941 | ||
5942 | p = r + f; | |
5943 | ||
5944 | va_start(ap, x); | |
5945 | for (;;) { | |
5946 | const char *t; | |
5947 | ||
5948 | t = va_arg(ap, const char *); | |
5949 | if (!t) | |
5950 | break; | |
5951 | ||
5952 | p = stpcpy(p, t); | |
5953 | } | |
5954 | va_end(ap); | |
5955 | ||
5956 | *p = 0; | |
5957 | *x = r; | |
5958 | ||
5959 | return r + l; | |
5960 | } | |
5961 | ||
5962 | char *strrep(const char *s, unsigned n) { | |
5963 | size_t l; | |
5964 | char *r, *p; | |
5965 | unsigned i; | |
5966 | ||
5967 | assert(s); | |
5968 | ||
5969 | l = strlen(s); | |
5970 | p = r = malloc(l * n + 1); | |
5971 | if (!r) | |
5972 | return NULL; | |
5973 | ||
5974 | for (i = 0; i < n; i++) | |
5975 | p = stpcpy(p, s); | |
5976 | ||
5977 | *p = 0; | |
5978 | return r; | |
5979 | } | |
5980 | ||
60f067b4 JS |
5981 | void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size) { |
5982 | size_t a, newalloc; | |
663996b3 MS |
5983 | void *q; |
5984 | ||
60f067b4 JS |
5985 | assert(p); |
5986 | assert(allocated); | |
5987 | ||
663996b3 MS |
5988 | if (*allocated >= need) |
5989 | return *p; | |
5990 | ||
60f067b4 JS |
5991 | newalloc = MAX(need * 2, 64u / size); |
5992 | a = newalloc * size; | |
5993 | ||
5994 | /* check for overflows */ | |
5995 | if (a < size * need) | |
5996 | return NULL; | |
5997 | ||
663996b3 MS |
5998 | q = realloc(*p, a); |
5999 | if (!q) | |
6000 | return NULL; | |
6001 | ||
6002 | *p = q; | |
60f067b4 JS |
6003 | *allocated = newalloc; |
6004 | return q; | |
6005 | } | |
6006 | ||
6007 | void* greedy_realloc0(void **p, size_t *allocated, size_t need, size_t size) { | |
6008 | size_t prev; | |
6009 | uint8_t *q; | |
6010 | ||
6011 | assert(p); | |
6012 | assert(allocated); | |
6013 | ||
6014 | prev = *allocated; | |
6015 | ||
6016 | q = greedy_realloc(p, allocated, need, size); | |
6017 | if (!q) | |
6018 | return NULL; | |
6019 | ||
6020 | if (*allocated > prev) | |
6021 | memzero(q + prev * size, (*allocated - prev) * size); | |
6022 | ||
663996b3 MS |
6023 | return q; |
6024 | } | |
6025 | ||
6026 | bool id128_is_valid(const char *s) { | |
6027 | size_t i, l; | |
6028 | ||
6029 | l = strlen(s); | |
6030 | if (l == 32) { | |
6031 | ||
6032 | /* Simple formatted 128bit hex string */ | |
6033 | ||
6034 | for (i = 0; i < l; i++) { | |
6035 | char c = s[i]; | |
6036 | ||
6037 | if (!(c >= '0' && c <= '9') && | |
6038 | !(c >= 'a' && c <= 'z') && | |
6039 | !(c >= 'A' && c <= 'Z')) | |
6040 | return false; | |
6041 | } | |
6042 | ||
6043 | } else if (l == 36) { | |
6044 | ||
6045 | /* Formatted UUID */ | |
6046 | ||
6047 | for (i = 0; i < l; i++) { | |
6048 | char c = s[i]; | |
6049 | ||
6050 | if ((i == 8 || i == 13 || i == 18 || i == 23)) { | |
6051 | if (c != '-') | |
6052 | return false; | |
6053 | } else { | |
6054 | if (!(c >= '0' && c <= '9') && | |
6055 | !(c >= 'a' && c <= 'z') && | |
6056 | !(c >= 'A' && c <= 'Z')) | |
6057 | return false; | |
6058 | } | |
6059 | } | |
6060 | ||
6061 | } else | |
6062 | return false; | |
6063 | ||
6064 | return true; | |
6065 | } | |
14228c0d | 6066 | |
14228c0d MB |
6067 | int split_pair(const char *s, const char *sep, char **l, char **r) { |
6068 | char *x, *a, *b; | |
6069 | ||
6070 | assert(s); | |
6071 | assert(sep); | |
6072 | assert(l); | |
6073 | assert(r); | |
6074 | ||
6075 | if (isempty(sep)) | |
6076 | return -EINVAL; | |
6077 | ||
6078 | x = strstr(s, sep); | |
6079 | if (!x) | |
6080 | return -EINVAL; | |
6081 | ||
6082 | a = strndup(s, x - s); | |
6083 | if (!a) | |
6084 | return -ENOMEM; | |
6085 | ||
6086 | b = strdup(x + strlen(sep)); | |
6087 | if (!b) { | |
6088 | free(a); | |
6089 | return -ENOMEM; | |
6090 | } | |
6091 | ||
6092 | *l = a; | |
6093 | *r = b; | |
6094 | ||
6095 | return 0; | |
6096 | } | |
60f067b4 JS |
6097 | |
6098 | int shall_restore_state(void) { | |
6099 | _cleanup_free_ char *line = NULL; | |
5eef597e | 6100 | const char *word, *state; |
60f067b4 JS |
6101 | size_t l; |
6102 | int r; | |
6103 | ||
6104 | r = proc_cmdline(&line); | |
6105 | if (r < 0) | |
6106 | return r; | |
6107 | if (r == 0) /* Container ... */ | |
6108 | return 1; | |
6109 | ||
6110 | r = 1; | |
6111 | ||
5eef597e | 6112 | FOREACH_WORD_QUOTED(word, l, line, state) { |
60f067b4 JS |
6113 | const char *e; |
6114 | char n[l+1]; | |
6115 | int k; | |
6116 | ||
5eef597e | 6117 | memcpy(n, word, l); |
60f067b4 JS |
6118 | n[l] = 0; |
6119 | ||
6120 | e = startswith(n, "systemd.restore_state="); | |
6121 | if (!e) | |
6122 | continue; | |
6123 | ||
6124 | k = parse_boolean(e); | |
6125 | if (k >= 0) | |
6126 | r = k; | |
6127 | } | |
6128 | ||
6129 | return r; | |
6130 | } | |
6131 | ||
6132 | int proc_cmdline(char **ret) { | |
6133 | int r; | |
6134 | ||
6135 | if (detect_container(NULL) > 0) { | |
6136 | char *buf = NULL, *p; | |
6137 | size_t sz = 0; | |
6138 | ||
6139 | r = read_full_file("/proc/1/cmdline", &buf, &sz); | |
6140 | if (r < 0) | |
6141 | return r; | |
6142 | ||
6143 | for (p = buf; p + 1 < buf + sz; p++) | |
6144 | if (*p == 0) | |
6145 | *p = ' '; | |
6146 | ||
6147 | *p = 0; | |
6148 | *ret = buf; | |
6149 | return 1; | |
6150 | } | |
6151 | ||
6152 | r = read_one_line_file("/proc/cmdline", ret); | |
6153 | if (r < 0) | |
6154 | return r; | |
6155 | ||
6156 | return 1; | |
6157 | } | |
6158 | ||
6159 | int parse_proc_cmdline(int (*parse_item)(const char *key, const char *value)) { | |
6160 | _cleanup_free_ char *line = NULL; | |
5eef597e | 6161 | const char *w, *state; |
60f067b4 JS |
6162 | size_t l; |
6163 | int r; | |
6164 | ||
6165 | assert(parse_item); | |
6166 | ||
6167 | r = proc_cmdline(&line); | |
6168 | if (r < 0) | |
6169 | log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); | |
6170 | if (r <= 0) | |
6171 | return 0; | |
6172 | ||
6173 | FOREACH_WORD_QUOTED(w, l, line, state) { | |
6174 | char word[l+1], *value; | |
6175 | ||
6176 | memcpy(word, w, l); | |
6177 | word[l] = 0; | |
6178 | ||
6179 | /* Filter out arguments that are intended only for the | |
6180 | * initrd */ | |
6181 | if (!in_initrd() && startswith(word, "rd.")) | |
6182 | continue; | |
6183 | ||
6184 | value = strchr(word, '='); | |
6185 | if (value) | |
6186 | *(value++) = 0; | |
6187 | ||
6188 | r = parse_item(word, value); | |
6189 | if (r < 0) | |
6190 | return r; | |
6191 | } | |
6192 | ||
6193 | return 0; | |
6194 | } | |
6195 | ||
6196 | int container_get_leader(const char *machine, pid_t *pid) { | |
6197 | _cleanup_free_ char *s = NULL, *class = NULL; | |
6198 | const char *p; | |
6199 | pid_t leader; | |
6200 | int r; | |
6201 | ||
6202 | assert(machine); | |
6203 | assert(pid); | |
6204 | ||
6205 | p = strappenda("/run/systemd/machines/", machine); | |
6206 | r = parse_env_file(p, NEWLINE, "LEADER", &s, "CLASS", &class, NULL); | |
6207 | if (r == -ENOENT) | |
6208 | return -EHOSTDOWN; | |
6209 | if (r < 0) | |
6210 | return r; | |
6211 | if (!s) | |
6212 | return -EIO; | |
6213 | ||
6214 | if (!streq_ptr(class, "container")) | |
6215 | return -EIO; | |
6216 | ||
6217 | r = parse_pid(s, &leader); | |
6218 | if (r < 0) | |
6219 | return r; | |
6220 | if (leader <= 1) | |
6221 | return -EIO; | |
6222 | ||
6223 | *pid = leader; | |
6224 | return 0; | |
6225 | } | |
6226 | ||
6227 | int namespace_open(pid_t pid, int *pidns_fd, int *mntns_fd, int *netns_fd, int *root_fd) { | |
6228 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, netnsfd = -1; | |
6229 | int rfd = -1; | |
6230 | ||
6231 | assert(pid >= 0); | |
6232 | ||
6233 | if (mntns_fd) { | |
6234 | const char *mntns; | |
6235 | ||
6236 | mntns = procfs_file_alloca(pid, "ns/mnt"); | |
6237 | mntnsfd = open(mntns, O_RDONLY|O_NOCTTY|O_CLOEXEC); | |
6238 | if (mntnsfd < 0) | |
6239 | return -errno; | |
6240 | } | |
6241 | ||
6242 | if (pidns_fd) { | |
6243 | const char *pidns; | |
6244 | ||
6245 | pidns = procfs_file_alloca(pid, "ns/pid"); | |
6246 | pidnsfd = open(pidns, O_RDONLY|O_NOCTTY|O_CLOEXEC); | |
6247 | if (pidnsfd < 0) | |
6248 | return -errno; | |
6249 | } | |
6250 | ||
6251 | if (netns_fd) { | |
6252 | const char *netns; | |
6253 | ||
6254 | netns = procfs_file_alloca(pid, "ns/net"); | |
6255 | netnsfd = open(netns, O_RDONLY|O_NOCTTY|O_CLOEXEC); | |
6256 | if (netnsfd < 0) | |
6257 | return -errno; | |
6258 | } | |
6259 | ||
6260 | if (root_fd) { | |
6261 | const char *root; | |
6262 | ||
6263 | root = procfs_file_alloca(pid, "root"); | |
6264 | rfd = open(root, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY); | |
6265 | if (rfd < 0) | |
6266 | return -errno; | |
6267 | } | |
6268 | ||
6269 | if (pidns_fd) | |
6270 | *pidns_fd = pidnsfd; | |
6271 | ||
6272 | if (mntns_fd) | |
6273 | *mntns_fd = mntnsfd; | |
6274 | ||
6275 | if (netns_fd) | |
6276 | *netns_fd = netnsfd; | |
6277 | ||
6278 | if (root_fd) | |
6279 | *root_fd = rfd; | |
6280 | ||
6281 | pidnsfd = mntnsfd = netnsfd = -1; | |
6282 | ||
6283 | return 0; | |
6284 | } | |
6285 | ||
6286 | int namespace_enter(int pidns_fd, int mntns_fd, int netns_fd, int root_fd) { | |
6287 | ||
6288 | if (pidns_fd >= 0) | |
6289 | if (setns(pidns_fd, CLONE_NEWPID) < 0) | |
6290 | return -errno; | |
6291 | ||
6292 | if (mntns_fd >= 0) | |
6293 | if (setns(mntns_fd, CLONE_NEWNS) < 0) | |
6294 | return -errno; | |
6295 | ||
6296 | if (netns_fd >= 0) | |
6297 | if (setns(netns_fd, CLONE_NEWNET) < 0) | |
6298 | return -errno; | |
6299 | ||
6300 | if (root_fd >= 0) { | |
6301 | if (fchdir(root_fd) < 0) | |
6302 | return -errno; | |
6303 | ||
6304 | if (chroot(".") < 0) | |
6305 | return -errno; | |
6306 | } | |
6307 | ||
6308 | if (setresgid(0, 0, 0) < 0) | |
6309 | return -errno; | |
6310 | ||
6311 | if (setgroups(0, NULL) < 0) | |
6312 | return -errno; | |
6313 | ||
6314 | if (setresuid(0, 0, 0) < 0) | |
6315 | return -errno; | |
6316 | ||
6317 | return 0; | |
6318 | } | |
6319 | ||
6320 | bool pid_is_unwaited(pid_t pid) { | |
6321 | /* Checks whether a PID is still valid at all, including a zombie */ | |
6322 | ||
6323 | if (pid <= 0) | |
6324 | return false; | |
6325 | ||
6326 | if (kill(pid, 0) >= 0) | |
6327 | return true; | |
6328 | ||
6329 | return errno != ESRCH; | |
6330 | } | |
6331 | ||
6332 | bool pid_is_alive(pid_t pid) { | |
6333 | int r; | |
6334 | ||
6335 | /* Checks whether a PID is still valid and not a zombie */ | |
6336 | ||
6337 | if (pid <= 0) | |
6338 | return false; | |
6339 | ||
6340 | r = get_process_state(pid); | |
6341 | if (r == -ENOENT || r == 'Z') | |
6342 | return false; | |
6343 | ||
6344 | return true; | |
6345 | } | |
6346 | ||
6347 | int getpeercred(int fd, struct ucred *ucred) { | |
6348 | socklen_t n = sizeof(struct ucred); | |
6349 | struct ucred u; | |
6350 | int r; | |
6351 | ||
6352 | assert(fd >= 0); | |
6353 | assert(ucred); | |
6354 | ||
6355 | r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &u, &n); | |
6356 | if (r < 0) | |
6357 | return -errno; | |
6358 | ||
6359 | if (n != sizeof(struct ucred)) | |
6360 | return -EIO; | |
6361 | ||
6362 | /* Check if the data is actually useful and not suppressed due | |
6363 | * to namespacing issues */ | |
6364 | if (u.pid <= 0) | |
6365 | return -ENODATA; | |
6366 | ||
6367 | *ucred = u; | |
6368 | return 0; | |
6369 | } | |
6370 | ||
6371 | int getpeersec(int fd, char **ret) { | |
6372 | socklen_t n = 64; | |
6373 | char *s; | |
6374 | int r; | |
6375 | ||
6376 | assert(fd >= 0); | |
6377 | assert(ret); | |
6378 | ||
6379 | s = new0(char, n); | |
6380 | if (!s) | |
6381 | return -ENOMEM; | |
6382 | ||
6383 | r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n); | |
6384 | if (r < 0) { | |
6385 | free(s); | |
6386 | ||
6387 | if (errno != ERANGE) | |
6388 | return -errno; | |
6389 | ||
6390 | s = new0(char, n); | |
6391 | if (!s) | |
6392 | return -ENOMEM; | |
6393 | ||
6394 | r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n); | |
6395 | if (r < 0) { | |
6396 | free(s); | |
6397 | return -errno; | |
6398 | } | |
6399 | } | |
6400 | ||
6401 | if (isempty(s)) { | |
6402 | free(s); | |
6403 | return -ENOTSUP; | |
6404 | } | |
6405 | ||
6406 | *ret = s; | |
6407 | return 0; | |
6408 | } | |
6409 | ||
6410 | /* This is much like like mkostemp() but is subject to umask(). */ | |
6411 | int mkostemp_safe(char *pattern, int flags) { | |
6412 | _cleanup_umask_ mode_t u; | |
6413 | int fd; | |
6414 | ||
6415 | assert(pattern); | |
6416 | ||
6417 | u = umask(077); | |
6418 | ||
6419 | fd = mkostemp(pattern, flags); | |
6420 | if (fd < 0) | |
6421 | return -errno; | |
6422 | ||
6423 | return fd; | |
6424 | } | |
6425 | ||
6426 | int open_tmpfile(const char *path, int flags) { | |
6427 | char *p; | |
6428 | int fd; | |
6429 | ||
6430 | assert(path); | |
6431 | ||
6432 | #ifdef O_TMPFILE | |
6433 | /* Try O_TMPFILE first, if it is supported */ | |
6434 | fd = open(path, flags|O_TMPFILE, S_IRUSR|S_IWUSR); | |
6435 | if (fd >= 0) | |
6436 | return fd; | |
6437 | #endif | |
6438 | ||
6439 | /* Fall back to unguessable name + unlinking */ | |
6440 | p = strappenda(path, "/systemd-tmp-XXXXXX"); | |
6441 | ||
6442 | fd = mkostemp_safe(p, flags); | |
6443 | if (fd < 0) | |
6444 | return fd; | |
6445 | ||
6446 | unlink(p); | |
6447 | return fd; | |
6448 | } | |
6449 | ||
6450 | int fd_warn_permissions(const char *path, int fd) { | |
6451 | struct stat st; | |
6452 | ||
6453 | if (fstat(fd, &st) < 0) | |
6454 | return -errno; | |
6455 | ||
6456 | if (st.st_mode & 0111) | |
6457 | log_warning("Configuration file %s is marked executable. Please remove executable permission bits. Proceeding anyway.", path); | |
6458 | ||
6459 | if (st.st_mode & 0002) | |
6460 | log_warning("Configuration file %s is marked world-writable. Please remove world writability permission bits. Proceeding anyway.", path); | |
6461 | ||
6462 | if (getpid() == 1 && (st.st_mode & 0044) != 0044) | |
6463 | log_warning("Configuration file %s is marked world-inaccessible. This has no effect as configuration data is accessible via APIs without restrictions. Proceeding anyway.", path); | |
6464 | ||
6465 | return 0; | |
6466 | } | |
6467 | ||
6468 | unsigned long personality_from_string(const char *p) { | |
6469 | ||
6470 | /* Parse a personality specifier. We introduce our own | |
6471 | * identifiers that indicate specific ABIs, rather than just | |
6472 | * hints regarding the register size, since we want to keep | |
6473 | * things open for multiple locally supported ABIs for the | |
6474 | * same register size. We try to reuse the ABI identifiers | |
6475 | * used by libseccomp. */ | |
6476 | ||
6477 | #if defined(__x86_64__) | |
6478 | ||
6479 | if (streq(p, "x86")) | |
6480 | return PER_LINUX32; | |
6481 | ||
6482 | if (streq(p, "x86-64")) | |
6483 | return PER_LINUX; | |
6484 | ||
6485 | #elif defined(__i386__) | |
6486 | ||
6487 | if (streq(p, "x86")) | |
6488 | return PER_LINUX; | |
6489 | #endif | |
6490 | ||
6491 | /* personality(7) documents that 0xffffffffUL is used for | |
6492 | * querying the current personality, hence let's use that here | |
6493 | * as error indicator. */ | |
6494 | return 0xffffffffUL; | |
6495 | } | |
6496 | ||
6497 | const char* personality_to_string(unsigned long p) { | |
6498 | ||
6499 | #if defined(__x86_64__) | |
6500 | ||
6501 | if (p == PER_LINUX32) | |
6502 | return "x86"; | |
6503 | ||
6504 | if (p == PER_LINUX) | |
6505 | return "x86-64"; | |
6506 | ||
6507 | #elif defined(__i386__) | |
6508 | ||
6509 | if (p == PER_LINUX) | |
6510 | return "x86"; | |
6511 | #endif | |
6512 | ||
6513 | return NULL; | |
6514 | } | |
6515 | ||
6516 | uint64_t physical_memory(void) { | |
6517 | long mem; | |
6518 | ||
6519 | /* We return this as uint64_t in case we are running as 32bit | |
6520 | * process on a 64bit kernel with huge amounts of memory */ | |
6521 | ||
6522 | mem = sysconf(_SC_PHYS_PAGES); | |
6523 | assert(mem > 0); | |
6524 | ||
6525 | return (uint64_t) mem * (uint64_t) page_size(); | |
6526 | } | |
6527 | ||
6528 | char* mount_test_option(const char *haystack, const char *needle) { | |
6529 | ||
6530 | struct mntent me = { | |
6531 | .mnt_opts = (char*) haystack | |
6532 | }; | |
6533 | ||
6534 | assert(needle); | |
6535 | ||
6536 | /* Like glibc's hasmntopt(), but works on a string, not a | |
6537 | * struct mntent */ | |
6538 | ||
6539 | if (!haystack) | |
6540 | return NULL; | |
6541 | ||
6542 | return hasmntopt(&me, needle); | |
6543 | } | |
6544 | ||
6545 | void hexdump(FILE *f, const void *p, size_t s) { | |
6546 | const uint8_t *b = p; | |
6547 | unsigned n = 0; | |
6548 | ||
6549 | assert(s == 0 || b); | |
6550 | ||
6551 | while (s > 0) { | |
6552 | size_t i; | |
6553 | ||
6554 | fprintf(f, "%04x ", n); | |
6555 | ||
6556 | for (i = 0; i < 16; i++) { | |
6557 | ||
6558 | if (i >= s) | |
6559 | fputs(" ", f); | |
6560 | else | |
6561 | fprintf(f, "%02x ", b[i]); | |
6562 | ||
6563 | if (i == 7) | |
6564 | fputc(' ', f); | |
6565 | } | |
6566 | ||
6567 | fputc(' ', f); | |
6568 | ||
6569 | for (i = 0; i < 16; i++) { | |
6570 | ||
6571 | if (i >= s) | |
6572 | fputc(' ', f); | |
6573 | else | |
6574 | fputc(isprint(b[i]) ? (char) b[i] : '.', f); | |
6575 | } | |
6576 | ||
6577 | fputc('\n', f); | |
6578 | ||
6579 | if (s < 16) | |
6580 | break; | |
6581 | ||
6582 | n += 16; | |
6583 | b += 16; | |
6584 | s -= 16; | |
6585 | } | |
6586 | } | |
6587 | ||
6588 | int update_reboot_param_file(const char *param) { | |
6589 | int r = 0; | |
6590 | ||
6591 | if (param) { | |
6592 | ||
6593 | r = write_string_file(REBOOT_PARAM_FILE, param); | |
6594 | if (r < 0) | |
6595 | log_error("Failed to write reboot param to " | |
6596 | REBOOT_PARAM_FILE": %s", strerror(-r)); | |
6597 | } else | |
6598 | unlink(REBOOT_PARAM_FILE); | |
6599 | ||
6600 | return r; | |
6601 | } | |
6602 | ||
6603 | int umount_recursive(const char *prefix, int flags) { | |
6604 | bool again; | |
6605 | int n = 0, r; | |
6606 | ||
6607 | /* Try to umount everything recursively below a | |
6608 | * directory. Also, take care of stacked mounts, and keep | |
6609 | * unmounting them until they are gone. */ | |
6610 | ||
6611 | do { | |
6612 | _cleanup_fclose_ FILE *proc_self_mountinfo = NULL; | |
6613 | ||
6614 | again = false; | |
6615 | r = 0; | |
6616 | ||
6617 | proc_self_mountinfo = fopen("/proc/self/mountinfo", "re"); | |
6618 | if (!proc_self_mountinfo) | |
6619 | return -errno; | |
6620 | ||
6621 | for (;;) { | |
6622 | _cleanup_free_ char *path = NULL, *p = NULL; | |
6623 | int k; | |
6624 | ||
6625 | k = fscanf(proc_self_mountinfo, | |
6626 | "%*s " /* (1) mount id */ | |
6627 | "%*s " /* (2) parent id */ | |
6628 | "%*s " /* (3) major:minor */ | |
6629 | "%*s " /* (4) root */ | |
6630 | "%ms " /* (5) mount point */ | |
6631 | "%*s" /* (6) mount options */ | |
6632 | "%*[^-]" /* (7) optional fields */ | |
6633 | "- " /* (8) separator */ | |
6634 | "%*s " /* (9) file system type */ | |
6635 | "%*s" /* (10) mount source */ | |
6636 | "%*s" /* (11) mount options 2 */ | |
6637 | "%*[^\n]", /* some rubbish at the end */ | |
6638 | &path); | |
6639 | if (k != 1) { | |
6640 | if (k == EOF) | |
6641 | break; | |
6642 | ||
6643 | continue; | |
6644 | } | |
6645 | ||
6646 | p = cunescape(path); | |
6647 | if (!p) | |
6648 | return -ENOMEM; | |
6649 | ||
6650 | if (!path_startswith(p, prefix)) | |
6651 | continue; | |
6652 | ||
6653 | if (umount2(p, flags) < 0) { | |
6654 | r = -errno; | |
6655 | continue; | |
6656 | } | |
6657 | ||
6658 | again = true; | |
6659 | n++; | |
6660 | ||
6661 | break; | |
6662 | } | |
6663 | ||
6664 | } while (again); | |
6665 | ||
6666 | return r ? r : n; | |
6667 | } | |
6668 | ||
6669 | int bind_remount_recursive(const char *prefix, bool ro) { | |
6670 | _cleanup_set_free_free_ Set *done = NULL; | |
6671 | _cleanup_free_ char *cleaned = NULL; | |
6672 | int r; | |
6673 | ||
6674 | /* Recursively remount a directory (and all its submounts) | |
6675 | * read-only or read-write. If the directory is already | |
6676 | * mounted, we reuse the mount and simply mark it | |
6677 | * MS_BIND|MS_RDONLY (or remove the MS_RDONLY for read-write | |
6678 | * operation). If it isn't we first make it one. Afterwards we | |
6679 | * apply MS_BIND|MS_RDONLY (or remove MS_RDONLY) to all | |
6680 | * submounts we can access, too. When mounts are stacked on | |
6681 | * the same mount point we only care for each individual | |
6682 | * "top-level" mount on each point, as we cannot | |
6683 | * influence/access the underlying mounts anyway. We do not | |
6684 | * have any effect on future submounts that might get | |
6685 | * propagated, they migt be writable. This includes future | |
6686 | * submounts that have been triggered via autofs. */ | |
6687 | ||
6688 | cleaned = strdup(prefix); | |
6689 | if (!cleaned) | |
6690 | return -ENOMEM; | |
6691 | ||
6692 | path_kill_slashes(cleaned); | |
6693 | ||
5eef597e | 6694 | done = set_new(&string_hash_ops); |
60f067b4 JS |
6695 | if (!done) |
6696 | return -ENOMEM; | |
6697 | ||
6698 | for (;;) { | |
6699 | _cleanup_fclose_ FILE *proc_self_mountinfo = NULL; | |
6700 | _cleanup_set_free_free_ Set *todo = NULL; | |
6701 | bool top_autofs = false; | |
6702 | char *x; | |
6703 | ||
5eef597e | 6704 | todo = set_new(&string_hash_ops); |
60f067b4 JS |
6705 | if (!todo) |
6706 | return -ENOMEM; | |
6707 | ||
6708 | proc_self_mountinfo = fopen("/proc/self/mountinfo", "re"); | |
6709 | if (!proc_self_mountinfo) | |
6710 | return -errno; | |
6711 | ||
6712 | for (;;) { | |
6713 | _cleanup_free_ char *path = NULL, *p = NULL, *type = NULL; | |
6714 | int k; | |
6715 | ||
6716 | k = fscanf(proc_self_mountinfo, | |
6717 | "%*s " /* (1) mount id */ | |
6718 | "%*s " /* (2) parent id */ | |
6719 | "%*s " /* (3) major:minor */ | |
6720 | "%*s " /* (4) root */ | |
6721 | "%ms " /* (5) mount point */ | |
6722 | "%*s" /* (6) mount options (superblock) */ | |
6723 | "%*[^-]" /* (7) optional fields */ | |
6724 | "- " /* (8) separator */ | |
6725 | "%ms " /* (9) file system type */ | |
6726 | "%*s" /* (10) mount source */ | |
6727 | "%*s" /* (11) mount options (bind mount) */ | |
6728 | "%*[^\n]", /* some rubbish at the end */ | |
6729 | &path, | |
6730 | &type); | |
6731 | if (k != 2) { | |
6732 | if (k == EOF) | |
6733 | break; | |
6734 | ||
6735 | continue; | |
6736 | } | |
6737 | ||
6738 | p = cunescape(path); | |
6739 | if (!p) | |
6740 | return -ENOMEM; | |
6741 | ||
6742 | /* Let's ignore autofs mounts. If they aren't | |
6743 | * triggered yet, we want to avoid triggering | |
6744 | * them, as we don't make any guarantees for | |
6745 | * future submounts anyway. If they are | |
6746 | * already triggered, then we will find | |
6747 | * another entry for this. */ | |
6748 | if (streq(type, "autofs")) { | |
6749 | top_autofs = top_autofs || path_equal(cleaned, p); | |
6750 | continue; | |
6751 | } | |
6752 | ||
6753 | if (path_startswith(p, cleaned) && | |
6754 | !set_contains(done, p)) { | |
6755 | ||
6756 | r = set_consume(todo, p); | |
6757 | p = NULL; | |
6758 | ||
6759 | if (r == -EEXIST) | |
6760 | continue; | |
6761 | if (r < 0) | |
6762 | return r; | |
6763 | } | |
6764 | } | |
6765 | ||
6766 | /* If we have no submounts to process anymore and if | |
6767 | * the root is either already done, or an autofs, we | |
6768 | * are done */ | |
6769 | if (set_isempty(todo) && | |
6770 | (top_autofs || set_contains(done, cleaned))) | |
6771 | return 0; | |
6772 | ||
6773 | if (!set_contains(done, cleaned) && | |
6774 | !set_contains(todo, cleaned)) { | |
6775 | /* The prefix directory itself is not yet a | |
6776 | * mount, make it one. */ | |
6777 | if (mount(cleaned, cleaned, NULL, MS_BIND|MS_REC, NULL) < 0) | |
6778 | return -errno; | |
6779 | ||
6780 | if (mount(NULL, prefix, NULL, MS_BIND|MS_REMOUNT|(ro ? MS_RDONLY : 0), NULL) < 0) | |
6781 | return -errno; | |
6782 | ||
6783 | x = strdup(cleaned); | |
6784 | if (!x) | |
6785 | return -ENOMEM; | |
6786 | ||
6787 | r = set_consume(done, x); | |
6788 | if (r < 0) | |
6789 | return r; | |
6790 | } | |
6791 | ||
6792 | while ((x = set_steal_first(todo))) { | |
6793 | ||
6794 | r = set_consume(done, x); | |
6795 | if (r == -EEXIST) | |
6796 | continue; | |
6797 | if (r < 0) | |
6798 | return r; | |
6799 | ||
6800 | if (mount(NULL, x, NULL, MS_BIND|MS_REMOUNT|(ro ? MS_RDONLY : 0), NULL) < 0) { | |
6801 | ||
6802 | /* Deal with mount points that are | |
6803 | * obstructed by a later mount */ | |
6804 | ||
6805 | if (errno != ENOENT) | |
6806 | return -errno; | |
6807 | } | |
6808 | ||
6809 | } | |
6810 | } | |
6811 | } | |
e842803a MB |
6812 | |
6813 | int fflush_and_check(FILE *f) { | |
6814 | assert(f); | |
6815 | ||
6816 | errno = 0; | |
6817 | fflush(f); | |
6818 | ||
6819 | if (ferror(f)) | |
6820 | return errno ? -errno : -EIO; | |
6821 | ||
6822 | return 0; | |
6823 | } | |
6824 | ||
6825 | char *tempfn_xxxxxx(const char *p) { | |
6826 | const char *fn; | |
6827 | char *t; | |
6828 | size_t k; | |
6829 | ||
6830 | assert(p); | |
6831 | ||
6832 | t = new(char, strlen(p) + 1 + 6 + 1); | |
6833 | if (!t) | |
6834 | return NULL; | |
6835 | ||
6836 | fn = basename(p); | |
6837 | k = fn - p; | |
6838 | ||
6839 | strcpy(stpcpy(stpcpy(mempcpy(t, p, k), "."), fn), "XXXXXX"); | |
6840 | ||
6841 | return t; | |
6842 | } | |
6843 | ||
6844 | char *tempfn_random(const char *p) { | |
6845 | const char *fn; | |
6846 | char *t, *x; | |
6847 | uint64_t u; | |
6848 | size_t k; | |
6849 | unsigned i; | |
6850 | ||
6851 | assert(p); | |
6852 | ||
6853 | t = new(char, strlen(p) + 1 + 16 + 1); | |
6854 | if (!t) | |
6855 | return NULL; | |
6856 | ||
6857 | fn = basename(p); | |
6858 | k = fn - p; | |
6859 | ||
6860 | x = stpcpy(stpcpy(mempcpy(t, p, k), "."), fn); | |
6861 | ||
6862 | u = random_u64(); | |
6863 | for (i = 0; i < 16; i++) { | |
6864 | *(x++) = hexchar(u & 0xF); | |
6865 | u >>= 4; | |
6866 | } | |
6867 | ||
6868 | *x = 0; | |
6869 | ||
6870 | return t; | |
6871 | } | |
6872 | ||
6873 | /* make sure the hostname is not "localhost" */ | |
6874 | bool is_localhost(const char *hostname) { | |
6875 | assert(hostname); | |
6876 | ||
5eef597e MP |
6877 | /* This tries to identify local host and domain names |
6878 | * described in RFC6761 plus the redhatism of .localdomain */ | |
e842803a MB |
6879 | |
6880 | return streq(hostname, "localhost") || | |
6881 | streq(hostname, "localhost.") || | |
5eef597e MP |
6882 | streq(hostname, "localdomain.") || |
6883 | streq(hostname, "localdomain") || | |
e842803a MB |
6884 | endswith(hostname, ".localhost") || |
6885 | endswith(hostname, ".localhost.") || | |
6886 | endswith(hostname, ".localdomain") || | |
6887 | endswith(hostname, ".localdomain."); | |
6888 | } | |
5eef597e MP |
6889 | |
6890 | int take_password_lock(const char *root) { | |
6891 | ||
6892 | struct flock flock = { | |
6893 | .l_type = F_WRLCK, | |
6894 | .l_whence = SEEK_SET, | |
6895 | .l_start = 0, | |
6896 | .l_len = 0, | |
6897 | }; | |
6898 | ||
6899 | const char *path; | |
6900 | int fd, r; | |
6901 | ||
6902 | /* This is roughly the same as lckpwdf(), but not as awful. We | |
6903 | * don't want to use alarm() and signals, hence we implement | |
6904 | * our own trivial version of this. | |
6905 | * | |
6906 | * Note that shadow-utils also takes per-database locks in | |
6907 | * addition to lckpwdf(). However, we don't given that they | |
6908 | * are redundant as they they invoke lckpwdf() first and keep | |
6909 | * it during everything they do. The per-database locks are | |
6910 | * awfully racy, and thus we just won't do them. */ | |
6911 | ||
6912 | if (root) | |
6913 | path = strappenda(root, "/etc/.pwd.lock"); | |
6914 | else | |
6915 | path = "/etc/.pwd.lock"; | |
6916 | ||
6917 | fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0600); | |
6918 | if (fd < 0) | |
6919 | return -errno; | |
6920 | ||
6921 | r = fcntl(fd, F_SETLKW, &flock); | |
6922 | if (r < 0) { | |
6923 | safe_close(fd); | |
6924 | return -errno; | |
6925 | } | |
6926 | ||
6927 | return fd; | |
6928 | } | |
6929 | ||
6930 | int is_symlink(const char *path) { | |
6931 | struct stat info; | |
6932 | ||
6933 | if (lstat(path, &info) < 0) | |
6934 | return -errno; | |
6935 | ||
6936 | return !!S_ISLNK(info.st_mode); | |
6937 | } | |
6938 | ||
6939 | int is_dir(const char* path, bool follow) { | |
6940 | struct stat st; | |
6941 | ||
6942 | if (follow) { | |
6943 | if (stat(path, &st) < 0) | |
6944 | return -errno; | |
6945 | } else { | |
6946 | if (lstat(path, &st) < 0) | |
6947 | return -errno; | |
6948 | } | |
6949 | ||
6950 | return !!S_ISDIR(st.st_mode); | |
6951 | } | |
6952 | ||
6953 | int unquote_first_word(const char **p, char **ret) { | |
6954 | _cleanup_free_ char *s = NULL; | |
6955 | size_t allocated = 0, sz = 0; | |
6956 | ||
6957 | enum { | |
6958 | START, | |
6959 | VALUE, | |
6960 | VALUE_ESCAPE, | |
6961 | SINGLE_QUOTE, | |
6962 | SINGLE_QUOTE_ESCAPE, | |
6963 | DOUBLE_QUOTE, | |
6964 | DOUBLE_QUOTE_ESCAPE, | |
6965 | SPACE, | |
6966 | } state = START; | |
6967 | ||
6968 | assert(p); | |
6969 | assert(*p); | |
6970 | assert(ret); | |
6971 | ||
6972 | /* Parses the first word of a string, and returns it in | |
6973 | * *ret. Removes all quotes in the process. When parsing fails | |
6974 | * (because of an uneven number of quotes or similar), leaves | |
6975 | * the pointer *p at the first invalid character. */ | |
6976 | ||
6977 | for (;;) { | |
6978 | char c = **p; | |
6979 | ||
6980 | switch (state) { | |
6981 | ||
6982 | case START: | |
6983 | if (c == 0) | |
6984 | goto finish; | |
6985 | else if (strchr(WHITESPACE, c)) | |
6986 | break; | |
6987 | ||
6988 | state = VALUE; | |
6989 | /* fallthrough */ | |
6990 | ||
6991 | case VALUE: | |
6992 | if (c == 0) | |
6993 | goto finish; | |
6994 | else if (c == '\'') | |
6995 | state = SINGLE_QUOTE; | |
6996 | else if (c == '\\') | |
6997 | state = VALUE_ESCAPE; | |
6998 | else if (c == '\"') | |
6999 | state = DOUBLE_QUOTE; | |
7000 | else if (strchr(WHITESPACE, c)) | |
7001 | state = SPACE; | |
7002 | else { | |
7003 | if (!GREEDY_REALLOC(s, allocated, sz+2)) | |
7004 | return -ENOMEM; | |
7005 | ||
7006 | s[sz++] = c; | |
7007 | } | |
7008 | ||
7009 | break; | |
7010 | ||
7011 | case VALUE_ESCAPE: | |
7012 | if (c == 0) | |
7013 | return -EINVAL; | |
7014 | ||
7015 | if (!GREEDY_REALLOC(s, allocated, sz+2)) | |
7016 | return -ENOMEM; | |
7017 | ||
7018 | s[sz++] = c; | |
7019 | state = VALUE; | |
7020 | ||
7021 | break; | |
7022 | ||
7023 | case SINGLE_QUOTE: | |
7024 | if (c == 0) | |
7025 | return -EINVAL; | |
7026 | else if (c == '\'') | |
7027 | state = VALUE; | |
7028 | else if (c == '\\') | |
7029 | state = SINGLE_QUOTE_ESCAPE; | |
7030 | else { | |
7031 | if (!GREEDY_REALLOC(s, allocated, sz+2)) | |
7032 | return -ENOMEM; | |
7033 | ||
7034 | s[sz++] = c; | |
7035 | } | |
7036 | ||
7037 | break; | |
7038 | ||
7039 | case SINGLE_QUOTE_ESCAPE: | |
7040 | if (c == 0) | |
7041 | return -EINVAL; | |
7042 | ||
7043 | if (!GREEDY_REALLOC(s, allocated, sz+2)) | |
7044 | return -ENOMEM; | |
7045 | ||
7046 | s[sz++] = c; | |
7047 | state = SINGLE_QUOTE; | |
7048 | break; | |
7049 | ||
7050 | case DOUBLE_QUOTE: | |
7051 | if (c == 0) | |
7052 | return -EINVAL; | |
7053 | else if (c == '\"') | |
7054 | state = VALUE; | |
7055 | else if (c == '\\') | |
7056 | state = DOUBLE_QUOTE_ESCAPE; | |
7057 | else { | |
7058 | if (!GREEDY_REALLOC(s, allocated, sz+2)) | |
7059 | return -ENOMEM; | |
7060 | ||
7061 | s[sz++] = c; | |
7062 | } | |
7063 | ||
7064 | break; | |
7065 | ||
7066 | case DOUBLE_QUOTE_ESCAPE: | |
7067 | if (c == 0) | |
7068 | return -EINVAL; | |
7069 | ||
7070 | if (!GREEDY_REALLOC(s, allocated, sz+2)) | |
7071 | return -ENOMEM; | |
7072 | ||
7073 | s[sz++] = c; | |
7074 | state = DOUBLE_QUOTE; | |
7075 | break; | |
7076 | ||
7077 | case SPACE: | |
7078 | if (c == 0) | |
7079 | goto finish; | |
7080 | if (!strchr(WHITESPACE, c)) | |
7081 | goto finish; | |
7082 | ||
7083 | break; | |
7084 | } | |
7085 | ||
7086 | (*p) ++; | |
7087 | } | |
7088 | ||
7089 | finish: | |
7090 | if (!s) { | |
7091 | *ret = NULL; | |
7092 | return 0; | |
7093 | } | |
7094 | ||
7095 | s[sz] = 0; | |
7096 | *ret = s; | |
7097 | s = NULL; | |
7098 | ||
7099 | return 1; | |
7100 | } | |
7101 | ||
7102 | int unquote_many_words(const char **p, ...) { | |
7103 | va_list ap; | |
7104 | char **l; | |
7105 | int n = 0, i, c, r; | |
7106 | ||
7107 | /* Parses a number of words from a string, stripping any | |
7108 | * quotes if necessary. */ | |
7109 | ||
7110 | assert(p); | |
7111 | ||
7112 | /* Count how many words are expected */ | |
7113 | va_start(ap, p); | |
7114 | for (;;) { | |
7115 | if (!va_arg(ap, char **)) | |
7116 | break; | |
7117 | n++; | |
7118 | } | |
7119 | va_end(ap); | |
7120 | ||
7121 | if (n <= 0) | |
7122 | return 0; | |
7123 | ||
7124 | /* Read all words into a temporary array */ | |
7125 | l = newa0(char*, n); | |
7126 | for (c = 0; c < n; c++) { | |
7127 | ||
7128 | r = unquote_first_word(p, &l[c]); | |
7129 | if (r < 0) { | |
7130 | int j; | |
7131 | ||
7132 | for (j = 0; j < c; j++) | |
7133 | free(l[j]); | |
7134 | ||
7135 | return r; | |
7136 | } | |
7137 | ||
7138 | if (r == 0) | |
7139 | break; | |
7140 | } | |
7141 | ||
7142 | /* If we managed to parse all words, return them in the passed | |
7143 | * in parameters */ | |
7144 | va_start(ap, p); | |
7145 | for (i = 0; i < n; i++) { | |
7146 | char **v; | |
7147 | ||
7148 | v = va_arg(ap, char **); | |
7149 | assert(v); | |
7150 | ||
7151 | *v = l[i]; | |
7152 | } | |
7153 | va_end(ap); | |
7154 | ||
7155 | return c; | |
7156 | } | |
7157 | ||
7158 | int free_and_strdup(char **p, const char *s) { | |
7159 | char *t; | |
7160 | ||
7161 | assert(p); | |
7162 | ||
7163 | /* Replaces a string pointer with an strdup()ed new string, | |
7164 | * possibly freeing the old one. */ | |
7165 | ||
7166 | if (s) { | |
7167 | t = strdup(s); | |
7168 | if (!t) | |
7169 | return -ENOMEM; | |
7170 | } else | |
7171 | t = NULL; | |
7172 | ||
7173 | free(*p); | |
7174 | *p = t; | |
7175 | ||
7176 | return 0; | |
7177 | } | |
7178 | ||
7179 | int sethostname_idempotent(const char *s) { | |
7180 | int r; | |
7181 | char buf[HOST_NAME_MAX + 1] = {}; | |
7182 | ||
7183 | assert(s); | |
7184 | ||
7185 | r = gethostname(buf, sizeof(buf)); | |
7186 | if (r < 0) | |
7187 | return -errno; | |
7188 | ||
7189 | if (streq(buf, s)) | |
7190 | return 0; | |
7191 | ||
7192 | r = sethostname(s, strlen(s)); | |
7193 | if (r < 0) | |
7194 | return -errno; | |
7195 | ||
7196 | return 1; | |
7197 | } |