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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>
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>
57 #include <sys/mount.h>
58 #include <linux/magic.h>
59 #include <limits.h>
60 #include <langinfo.h>
61 #include <locale.h>
62 #include <sys/personality.h>
63 #include <libgen.h>
64 #undef basename
65
66 #ifdef HAVE_SYS_AUXV_H
67 #include <sys/auxv.h>
68 #endif
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"
77 #include "mkdir.h"
78 #include "path-util.h"
79 #include "exit-status.h"
80 #include "hashmap.h"
81 #include "env-util.h"
82 #include "fileio.h"
83 #include "device-nodes.h"
84 #include "utf8.h"
85 #include "gunicode.h"
86 #include "virt.h"
87 #include "def.h"
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) {
96 static thread_local size_t pgsz = 0;
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
143 char* first_word(const char *s, const char *word) {
144 size_t sl, wl;
145 const char *p;
146
147 assert(s);
148 assert(word);
149
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
154 sl = strlen(s);
155 wl = strlen(word);
156
157 if (sl < wl)
158 return NULL;
159
160 if (wl == 0)
161 return (char*) s;
162
163 if (memcmp(s, word, wl) != 0)
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;
172
173 p += strspn(p, WHITESPACE);
174 return (char*) p;
175 }
176
177 int close_nointr(int fd) {
178 assert(fd >= 0);
179
180 if (close(fd) >= 0)
181 return 0;
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;
196 }
197
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... */
215
216 assert_se(close_nointr(fd) != -EBADF);
217 }
218
219 return -1;
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++)
228 safe_close(fds[i]);
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
245 if (streq(v, "1") || strcaseeq(v, "yes") || strcaseeq(v, "y") || strcaseeq(v, "true") || strcaseeq(v, "t") || strcaseeq(v, "on"))
246 return 1;
247 else if (streq(v, "0") || strcaseeq(v, "no") || strcaseeq(v, "n") || strcaseeq(v, "false") || strcaseeq(v, "f") || strcaseeq(v, "off"))
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
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
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
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
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;
402 double d = 0;
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
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]))
429 break;
430 }
431 /* if s ends in \, return index of previous char */
432 return n - escaped;
433 }
434
435 /* Split a string into words. */
436 const char* split(const char **state, size_t *l, const char *separator, bool quoted) {
437 const char *current;
438
439 current = *state;
440
441 if (!*current) {
442 assert(**state == '\0');
443 return NULL;
444 }
445
446 current += strspn(current, separator);
447 if (!*current) {
448 *state = current;
449 return NULL;
450 }
451
452 if (quoted && strchr("\'\"", *current)) {
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;
464 } else if (quoted) {
465 *l = strcspn_escaped(current, separator);
466 *state = current + *l;
467 } else {
468 *l = strcspn(current, separator);
469 *state = current + *l;
470 }
471
472 return current;
473 }
474
475 int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
476 int r;
477 _cleanup_free_ char *line = NULL;
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");
490 r = read_one_line_file(p, &line);
491 if (r < 0)
492 return r;
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) {
519 int r;
520 _cleanup_free_ char *line = NULL;
521 const char *p;
522
523 assert(pid >= 0);
524 assert(st);
525
526 p = procfs_file_alloca(pid, "stat");
527 r = read_one_line_file(p, &line);
528 if (r < 0)
529 return r;
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
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
611 int get_process_comm(pid_t pid, char **name) {
612 const char *p;
613 int r;
614
615 assert(name);
616 assert(pid >= 0);
617
618 p = procfs_file_alloca(pid, "comm");
619
620 r = read_one_line_file(p, name);
621 if (r == -ENOENT)
622 return -ESRCH;
623
624 return r;
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
636 p = procfs_file_alloca(pid, "cmdline");
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) {
699 _cleanup_free_ char *t = NULL;
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);
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
749 int get_process_capeff(pid_t pid, char **capeff) {
750 const char *p;
751
752 assert(capeff);
753 assert(pid >= 0);
754
755 p = procfs_file_alloca(pid, "status");
756
757 return get_status_field(p, "\nCapEff:", capeff);
758 }
759
760 int get_process_exe(pid_t pid, char **name) {
761 const char *p;
762 char *d;
763 int r;
764
765 assert(pid >= 0);
766 assert(name);
767
768 p = procfs_file_alloca(pid, "exe");
769
770 r = readlink_malloc(p, name);
771 if (r < 0)
772 return r == -ENOENT ? -ESRCH : r;
773
774 d = endswith(*name, " (deleted)");
775 if (d)
776 *d = '\0';
777
778 return 0;
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
859 int readlinkat_malloc(int fd, const char *p, char **ret) {
860 size_t l = 100;
861 int r;
862
863 assert(p);
864 assert(ret);
865
866 for (;;) {
867 char *c;
868 ssize_t n;
869
870 c = new(char, l);
871 if (!c)
872 return -ENOMEM;
873
874 n = readlinkat(fd, p, c, l-1);
875 if (n < 0) {
876 r = -errno;
877 free(c);
878 return r;
879 }
880
881 if ((size_t) n < l-1) {
882 c[n] = 0;
883 *ret = c;
884 return 0;
885 }
886
887 free(c);
888 l *= 2;
889 }
890 }
891
892 int readlink_malloc(const char *p, char **ret) {
893 return readlinkat_malloc(AT_FDCWD, p, ret);
894 }
895
896 int readlink_and_make_absolute(const char *p, char **r) {
897 _cleanup_free_ char *target = NULL;
898 char *k;
899 int j;
900
901 assert(p);
902 assert(r);
903
904 j = readlink_malloc(p, &target);
905 if (j < 0)
906 return j;
907
908 k = file_in_same_dir(p, target);
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) {
940 int sig, r = 0;
941
942 for (sig = 1; sig < _NSIG; sig++) {
943 struct sigaction sa = {
944 .sa_handler = SIG_DFL,
945 .sa_flags = SA_RESTART,
946 };
947
948 /* These two cannot be caught... */
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))
955 if (errno != EINVAL && r == 0)
956 r = -errno;
957 }
958
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
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
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
1098 return -EINVAL;
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
1153 return -EINVAL;
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
1165 return -EINVAL;
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)
1257 return NULL;
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
1316 if (a < 0 || b < 0 || (a == 0 && b == 0)) {
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
1343 if (a < 0 || b < 0 || c < 0 || (a == 0 && b == 0 && c == 0)) {
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
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") ||
1437 endswith(filename, ".dpkg-tmp") ||
1438 endswith(filename, ".swp");
1439 }
1440
1441 bool ignore_file(const char *filename) {
1442 assert(filename);
1443
1444 if (endswith(filename, "~"))
1445 return true;
1446
1447 return ignore_file_allow_backup(filename);
1448 }
1449
1450 int fd_nonblock(int fd, bool nonblock) {
1451 int flags, nflags;
1452
1453 assert(fd >= 0);
1454
1455 flags = fcntl(fd, F_GETFL, 0);
1456 if (flags < 0)
1457 return -errno;
1458
1459 if (nonblock)
1460 nflags = flags | O_NONBLOCK;
1461 else
1462 nflags = flags & ~O_NONBLOCK;
1463
1464 if (nflags == flags)
1465 return 0;
1466
1467 if (fcntl(fd, F_SETFL, nflags) < 0)
1468 return -errno;
1469
1470 return 0;
1471 }
1472
1473 int fd_cloexec(int fd, bool cloexec) {
1474 int flags, nflags;
1475
1476 assert(fd >= 0);
1477
1478 flags = fcntl(fd, F_GETFD, 0);
1479 if (flags < 0)
1480 return -errno;
1481
1482 if (cloexec)
1483 nflags = flags | FD_CLOEXEC;
1484 else
1485 nflags = flags & ~FD_CLOEXEC;
1486
1487 if (nflags == flags)
1488 return 0;
1489
1490 if (fcntl(fd, F_SETFD, nflags) < 0)
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) {
1509 _cleanup_closedir_ DIR *d = NULL;
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
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"
1582 "sshfs\0"
1583 "ncpfs\0"
1584 "ncp\0"
1585 "nfs\0"
1586 "nfs4\0"
1587 "gfs\0"
1588 "gfs2\0"
1589 "glusterfs\0";
1590
1591 const char *x;
1592
1593 x = startswith(fstype, "fuse.");
1594 if (x)
1595 fstype = x;
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;
1627 char c, line[LINE_MAX];
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
1642 if (t != USEC_INFINITY) {
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
1664 if (t != USEC_INFINITY) {
1665 if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0)
1666 return -ETIMEDOUT;
1667 }
1668
1669 errno = 0;
1670 if (!fgets(line, sizeof(line), f))
1671 return errno ? -errno : -EIO;
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
1685 int ask_char(char *ret, const char *replies, const char *text, ...) {
1686 int r;
1687
1688 assert(ret);
1689 assert(replies);
1690 assert(text);
1691
1692 for (;;) {
1693 va_list ap;
1694 char c;
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
1709 r = read_one_char(stdin, &c, USEC_INFINITY, &need_nl);
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
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
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) {
1841 _cleanup_close_ int fd = -1;
1842
1843 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
1844 if (fd < 0)
1845 return fd;
1846
1847 return reset_terminal_fd(fd, true);
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
1863 assert(!(mode & O_CREAT));
1864
1865 for (;;) {
1866 fd = open(name, mode, 0);
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
1881 if (fd < 0)
1882 return -errno;
1883
1884 r = isatty(fd);
1885 if (r < 0) {
1886 safe_close(fd);
1887 return -errno;
1888 }
1889
1890 if (!r) {
1891 safe_close(fd);
1892 return -ENOTTY;
1893 }
1894
1895 return fd;
1896 }
1897
1898 int flush_fd(int fd) {
1899 struct pollfd pollfd = {
1900 .fd = fd,
1901 .events = POLLIN,
1902 };
1903
1904 for (;;) {
1905 char buf[LINE_MAX];
1906 ssize_t l;
1907 int r;
1908
1909 r = poll(&pollfd, 1, 0);
1910 if (r < 0) {
1911 if (errno == EINTR)
1912 continue;
1913
1914 return -errno;
1915
1916 } else if (r == 0)
1917 return 0;
1918
1919 l = read(fd, buf, sizeof(buf));
1920 if (l < 0) {
1921
1922 if (errno == EINTR)
1923 continue;
1924
1925 if (errno == EAGAIN)
1926 return 0;
1927
1928 return -errno;
1929 } else if (l == 0)
1930 return 0;
1931 }
1932 }
1933
1934 int acquire_terminal(
1935 const char *name,
1936 bool fail,
1937 bool force,
1938 bool ignore_tiocstty_eperm,
1939 usec_t timeout) {
1940
1941 int fd = -1, notify = -1, r = 0, wd = -1;
1942 usec_t ts = 0;
1943
1944 assert(name);
1945
1946 /* We use inotify to be notified when the tty is closed. We
1947 * create the watch before checking if we can actually acquire
1948 * it, so that we don't lose any event.
1949 *
1950 * Note: strictly speaking this actually watches for the
1951 * device being closed, it does *not* really watch whether a
1952 * tty loses its controlling process. However, unless some
1953 * rogue process uses TIOCNOTTY on /dev/tty *after* closing
1954 * its tty otherwise this will not become a problem. As long
1955 * as the administrator makes sure not configure any service
1956 * on the same tty as an untrusted user this should not be a
1957 * problem. (Which he probably should not do anyway.) */
1958
1959 if (timeout != USEC_INFINITY)
1960 ts = now(CLOCK_MONOTONIC);
1961
1962 if (!fail && !force) {
1963 notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0));
1964 if (notify < 0) {
1965 r = -errno;
1966 goto fail;
1967 }
1968
1969 wd = inotify_add_watch(notify, name, IN_CLOSE);
1970 if (wd < 0) {
1971 r = -errno;
1972 goto fail;
1973 }
1974 }
1975
1976 for (;;) {
1977 struct sigaction sa_old, sa_new = {
1978 .sa_handler = SIG_IGN,
1979 .sa_flags = SA_RESTART,
1980 };
1981
1982 if (notify >= 0) {
1983 r = flush_fd(notify);
1984 if (r < 0)
1985 goto fail;
1986 }
1987
1988 /* We pass here O_NOCTTY only so that we can check the return
1989 * value TIOCSCTTY and have a reliable way to figure out if we
1990 * successfully became the controlling process of the tty */
1991 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
1992 if (fd < 0)
1993 return fd;
1994
1995 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
1996 * if we already own the tty. */
1997 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
1998
1999 /* First, try to get the tty */
2000 if (ioctl(fd, TIOCSCTTY, force) < 0)
2001 r = -errno;
2002
2003 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
2004
2005 /* Sometimes it makes sense to ignore TIOCSCTTY
2006 * returning EPERM, i.e. when very likely we already
2007 * are have this controlling terminal. */
2008 if (r < 0 && r == -EPERM && ignore_tiocstty_eperm)
2009 r = 0;
2010
2011 if (r < 0 && (force || fail || r != -EPERM)) {
2012 goto fail;
2013 }
2014
2015 if (r >= 0)
2016 break;
2017
2018 assert(!fail);
2019 assert(!force);
2020 assert(notify >= 0);
2021
2022 for (;;) {
2023 uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
2024 ssize_t l;
2025 struct inotify_event *e;
2026
2027 if (timeout != USEC_INFINITY) {
2028 usec_t n;
2029
2030 n = now(CLOCK_MONOTONIC);
2031 if (ts + timeout < n) {
2032 r = -ETIMEDOUT;
2033 goto fail;
2034 }
2035
2036 r = fd_wait_for_event(fd, POLLIN, ts + timeout - n);
2037 if (r < 0)
2038 goto fail;
2039
2040 if (r == 0) {
2041 r = -ETIMEDOUT;
2042 goto fail;
2043 }
2044 }
2045
2046 l = read(notify, inotify_buffer, sizeof(inotify_buffer));
2047 if (l < 0) {
2048
2049 if (errno == EINTR || errno == EAGAIN)
2050 continue;
2051
2052 r = -errno;
2053 goto fail;
2054 }
2055
2056 e = (struct inotify_event*) inotify_buffer;
2057
2058 while (l > 0) {
2059 size_t step;
2060
2061 if (e->wd != wd || !(e->mask & IN_CLOSE)) {
2062 r = -EIO;
2063 goto fail;
2064 }
2065
2066 step = sizeof(struct inotify_event) + e->len;
2067 assert(step <= (size_t) l);
2068
2069 e = (struct inotify_event*) ((uint8_t*) e + step);
2070 l -= step;
2071 }
2072
2073 break;
2074 }
2075
2076 /* We close the tty fd here since if the old session
2077 * ended our handle will be dead. It's important that
2078 * we do this after sleeping, so that we don't enter
2079 * an endless loop. */
2080 safe_close(fd);
2081 }
2082
2083 safe_close(notify);
2084
2085 r = reset_terminal_fd(fd, true);
2086 if (r < 0)
2087 log_warning("Failed to reset terminal: %s", strerror(-r));
2088
2089 return fd;
2090
2091 fail:
2092 safe_close(fd);
2093 safe_close(notify);
2094
2095 return r;
2096 }
2097
2098 int release_terminal(void) {
2099 static const struct sigaction sa_new = {
2100 .sa_handler = SIG_IGN,
2101 .sa_flags = SA_RESTART,
2102 };
2103
2104 _cleanup_close_ int fd = -1;
2105 struct sigaction sa_old;
2106 int r = 0;
2107
2108 fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC);
2109 if (fd < 0)
2110 return -errno;
2111
2112 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
2113 * by our own TIOCNOTTY */
2114 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
2115
2116 if (ioctl(fd, TIOCNOTTY) < 0)
2117 r = -errno;
2118
2119 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
2120
2121 return r;
2122 }
2123
2124 int sigaction_many(const struct sigaction *sa, ...) {
2125 va_list ap;
2126 int r = 0, sig;
2127
2128 va_start(ap, sa);
2129 while ((sig = va_arg(ap, int)) > 0)
2130 if (sigaction(sig, sa, NULL) < 0)
2131 r = -errno;
2132 va_end(ap);
2133
2134 return r;
2135 }
2136
2137 int ignore_signals(int sig, ...) {
2138 struct sigaction sa = {
2139 .sa_handler = SIG_IGN,
2140 .sa_flags = SA_RESTART,
2141 };
2142 va_list ap;
2143 int r = 0;
2144
2145 if (sigaction(sig, &sa, NULL) < 0)
2146 r = -errno;
2147
2148 va_start(ap, sig);
2149 while ((sig = va_arg(ap, int)) > 0)
2150 if (sigaction(sig, &sa, NULL) < 0)
2151 r = -errno;
2152 va_end(ap);
2153
2154 return r;
2155 }
2156
2157 int default_signals(int sig, ...) {
2158 struct sigaction sa = {
2159 .sa_handler = SIG_DFL,
2160 .sa_flags = SA_RESTART,
2161 };
2162 va_list ap;
2163 int r = 0;
2164
2165 if (sigaction(sig, &sa, NULL) < 0)
2166 r = -errno;
2167
2168 va_start(ap, sig);
2169 while ((sig = va_arg(ap, int)) > 0)
2170 if (sigaction(sig, &sa, NULL) < 0)
2171 r = -errno;
2172 va_end(ap);
2173
2174 return r;
2175 }
2176
2177 void safe_close_pair(int p[]) {
2178 assert(p);
2179
2180 if (p[0] == p[1]) {
2181 /* Special case pairs which use the same fd in both
2182 * directions... */
2183 p[0] = p[1] = safe_close(p[0]);
2184 return;
2185 }
2186
2187 p[0] = safe_close(p[0]);
2188 p[1] = safe_close(p[1]);
2189 }
2190
2191 ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll) {
2192 uint8_t *p = buf;
2193 ssize_t n = 0;
2194
2195 assert(fd >= 0);
2196 assert(buf);
2197
2198 while (nbytes > 0) {
2199 ssize_t k;
2200
2201 k = read(fd, p, nbytes);
2202 if (k < 0 && errno == EINTR)
2203 continue;
2204
2205 if (k < 0 && errno == EAGAIN && do_poll) {
2206
2207 /* We knowingly ignore any return value here,
2208 * and expect that any error/EOF is reported
2209 * via read() */
2210
2211 fd_wait_for_event(fd, POLLIN, USEC_INFINITY);
2212 continue;
2213 }
2214
2215 if (k <= 0)
2216 return n > 0 ? n : (k < 0 ? -errno : 0);
2217
2218 p += k;
2219 nbytes -= k;
2220 n += k;
2221 }
2222
2223 return n;
2224 }
2225
2226 ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) {
2227 const uint8_t *p = buf;
2228 ssize_t n = 0;
2229
2230 assert(fd >= 0);
2231 assert(buf);
2232
2233 while (nbytes > 0) {
2234 ssize_t k;
2235
2236 k = write(fd, p, nbytes);
2237 if (k < 0 && errno == EINTR)
2238 continue;
2239
2240 if (k < 0 && errno == EAGAIN && do_poll) {
2241
2242 /* We knowingly ignore any return value here,
2243 * and expect that any error/EOF is reported
2244 * via write() */
2245
2246 fd_wait_for_event(fd, POLLOUT, USEC_INFINITY);
2247 continue;
2248 }
2249
2250 if (k <= 0)
2251 return n > 0 ? n : (k < 0 ? -errno : 0);
2252
2253 p += k;
2254 nbytes -= k;
2255 n += k;
2256 }
2257
2258 return n;
2259 }
2260
2261 int parse_size(const char *t, off_t base, off_t *size) {
2262
2263 /* Soo, sometimes we want to parse IEC binary suffxies, and
2264 * sometimes SI decimal suffixes. This function can parse
2265 * both. Which one is the right way depends on the
2266 * context. Wikipedia suggests that SI is customary for
2267 * hardrware metrics and network speeds, while IEC is
2268 * customary for most data sizes used by software and volatile
2269 * (RAM) memory. Hence be careful which one you pick!
2270 *
2271 * In either case we use just K, M, G as suffix, and not Ki,
2272 * Mi, Gi or so (as IEC would suggest). That's because that's
2273 * frickin' ugly. But this means you really need to make sure
2274 * to document which base you are parsing when you use this
2275 * call. */
2276
2277 struct table {
2278 const char *suffix;
2279 unsigned long long factor;
2280 };
2281
2282 static const struct table iec[] = {
2283 { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
2284 { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
2285 { "T", 1024ULL*1024ULL*1024ULL*1024ULL },
2286 { "G", 1024ULL*1024ULL*1024ULL },
2287 { "M", 1024ULL*1024ULL },
2288 { "K", 1024ULL },
2289 { "B", 1 },
2290 { "", 1 },
2291 };
2292
2293 static const struct table si[] = {
2294 { "E", 1000ULL*1000ULL*1000ULL*1000ULL*1000ULL*1000ULL },
2295 { "P", 1000ULL*1000ULL*1000ULL*1000ULL*1000ULL },
2296 { "T", 1000ULL*1000ULL*1000ULL*1000ULL },
2297 { "G", 1000ULL*1000ULL*1000ULL },
2298 { "M", 1000ULL*1000ULL },
2299 { "K", 1000ULL },
2300 { "B", 1 },
2301 { "", 1 },
2302 };
2303
2304 const struct table *table;
2305 const char *p;
2306 unsigned long long r = 0;
2307 unsigned n_entries, start_pos = 0;
2308
2309 assert(t);
2310 assert(base == 1000 || base == 1024);
2311 assert(size);
2312
2313 if (base == 1000) {
2314 table = si;
2315 n_entries = ELEMENTSOF(si);
2316 } else {
2317 table = iec;
2318 n_entries = ELEMENTSOF(iec);
2319 }
2320
2321 p = t;
2322 do {
2323 long long l;
2324 unsigned long long l2;
2325 double frac = 0;
2326 char *e;
2327 unsigned i;
2328
2329 errno = 0;
2330 l = strtoll(p, &e, 10);
2331
2332 if (errno > 0)
2333 return -errno;
2334
2335 if (l < 0)
2336 return -ERANGE;
2337
2338 if (e == p)
2339 return -EINVAL;
2340
2341 if (*e == '.') {
2342 e++;
2343 if (*e >= '0' && *e <= '9') {
2344 char *e2;
2345
2346 /* strotoull itself would accept space/+/- */
2347 l2 = strtoull(e, &e2, 10);
2348
2349 if (errno == ERANGE)
2350 return -errno;
2351
2352 /* Ignore failure. E.g. 10.M is valid */
2353 frac = l2;
2354 for (; e < e2; e++)
2355 frac /= 10;
2356 }
2357 }
2358
2359 e += strspn(e, WHITESPACE);
2360
2361 for (i = start_pos; i < n_entries; i++)
2362 if (startswith(e, table[i].suffix)) {
2363 unsigned long long tmp;
2364 if ((unsigned long long) l + (frac > 0) > ULLONG_MAX / table[i].factor)
2365 return -ERANGE;
2366 tmp = l * table[i].factor + (unsigned long long) (frac * table[i].factor);
2367 if (tmp > ULLONG_MAX - r)
2368 return -ERANGE;
2369
2370 r += tmp;
2371 if ((unsigned long long) (off_t) r != r)
2372 return -ERANGE;
2373
2374 p = e + strlen(table[i].suffix);
2375
2376 start_pos = i + 1;
2377 break;
2378 }
2379
2380 if (i >= n_entries)
2381 return -EINVAL;
2382
2383 } while (*p);
2384
2385 *size = r;
2386
2387 return 0;
2388 }
2389
2390 int make_stdio(int fd) {
2391 int r, s, t;
2392
2393 assert(fd >= 0);
2394
2395 r = dup3(fd, STDIN_FILENO, 0);
2396 s = dup3(fd, STDOUT_FILENO, 0);
2397 t = dup3(fd, STDERR_FILENO, 0);
2398
2399 if (fd >= 3)
2400 safe_close(fd);
2401
2402 if (r < 0 || s < 0 || t < 0)
2403 return -errno;
2404
2405 /* We rely here that the new fd has O_CLOEXEC not set */
2406
2407 return 0;
2408 }
2409
2410 int make_null_stdio(void) {
2411 int null_fd;
2412
2413 null_fd = open("/dev/null", O_RDWR|O_NOCTTY);
2414 if (null_fd < 0)
2415 return -errno;
2416
2417 return make_stdio(null_fd);
2418 }
2419
2420 bool is_device_path(const char *path) {
2421
2422 /* Returns true on paths that refer to a device, either in
2423 * sysfs or in /dev */
2424
2425 return
2426 path_startswith(path, "/dev/") ||
2427 path_startswith(path, "/sys/");
2428 }
2429
2430 int dir_is_empty(const char *path) {
2431 _cleanup_closedir_ DIR *d;
2432
2433 d = opendir(path);
2434 if (!d)
2435 return -errno;
2436
2437 for (;;) {
2438 struct dirent *de;
2439
2440 errno = 0;
2441 de = readdir(d);
2442 if (!de && errno != 0)
2443 return -errno;
2444
2445 if (!de)
2446 return 1;
2447
2448 if (!ignore_file(de->d_name))
2449 return 0;
2450 }
2451 }
2452
2453 char* dirname_malloc(const char *path) {
2454 char *d, *dir, *dir2;
2455
2456 d = strdup(path);
2457 if (!d)
2458 return NULL;
2459 dir = dirname(d);
2460 assert(dir);
2461
2462 if (dir != d) {
2463 dir2 = strdup(dir);
2464 free(d);
2465 return dir2;
2466 }
2467
2468 return dir;
2469 }
2470
2471 int dev_urandom(void *p, size_t n) {
2472 _cleanup_close_ int fd;
2473 ssize_t k;
2474
2475 fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY);
2476 if (fd < 0)
2477 return errno == ENOENT ? -ENOSYS : -errno;
2478
2479 k = loop_read(fd, p, n, true);
2480 if (k < 0)
2481 return (int) k;
2482 if ((size_t) k != n)
2483 return -EIO;
2484
2485 return 0;
2486 }
2487
2488 void random_bytes(void *p, size_t n) {
2489 static bool srand_called = false;
2490 uint8_t *q;
2491 int r;
2492
2493 r = dev_urandom(p, n);
2494 if (r >= 0)
2495 return;
2496
2497 /* If some idiot made /dev/urandom unavailable to us, he'll
2498 * get a PRNG instead. */
2499
2500 if (!srand_called) {
2501 unsigned x = 0;
2502
2503 #ifdef HAVE_SYS_AUXV_H
2504 /* The kernel provides us with a bit of entropy in
2505 * auxv, so let's try to make use of that to seed the
2506 * pseudo-random generator. It's better than
2507 * nothing... */
2508
2509 void *auxv;
2510
2511 auxv = (void*) getauxval(AT_RANDOM);
2512 if (auxv)
2513 x ^= *(unsigned*) auxv;
2514 #endif
2515
2516 x ^= (unsigned) now(CLOCK_REALTIME);
2517 x ^= (unsigned) gettid();
2518
2519 srand(x);
2520 srand_called = true;
2521 }
2522
2523 for (q = p; q < (uint8_t*) p + n; q ++)
2524 *q = rand();
2525 }
2526
2527 void rename_process(const char name[8]) {
2528 assert(name);
2529
2530 /* This is a like a poor man's setproctitle(). It changes the
2531 * comm field, argv[0], and also the glibc's internally used
2532 * name of the process. For the first one a limit of 16 chars
2533 * applies, to the second one usually one of 10 (i.e. length
2534 * of "/sbin/init"), to the third one one of 7 (i.e. length of
2535 * "systemd"). If you pass a longer string it will be
2536 * truncated */
2537
2538 prctl(PR_SET_NAME, name);
2539
2540 if (program_invocation_name)
2541 strncpy(program_invocation_name, name, strlen(program_invocation_name));
2542
2543 if (saved_argc > 0) {
2544 int i;
2545
2546 if (saved_argv[0])
2547 strncpy(saved_argv[0], name, strlen(saved_argv[0]));
2548
2549 for (i = 1; i < saved_argc; i++) {
2550 if (!saved_argv[i])
2551 break;
2552
2553 memzero(saved_argv[i], strlen(saved_argv[i]));
2554 }
2555 }
2556 }
2557
2558 void sigset_add_many(sigset_t *ss, ...) {
2559 va_list ap;
2560 int sig;
2561
2562 assert(ss);
2563
2564 va_start(ap, ss);
2565 while ((sig = va_arg(ap, int)) > 0)
2566 assert_se(sigaddset(ss, sig) == 0);
2567 va_end(ap);
2568 }
2569
2570 int sigprocmask_many(int how, ...) {
2571 va_list ap;
2572 sigset_t ss;
2573 int sig;
2574
2575 assert_se(sigemptyset(&ss) == 0);
2576
2577 va_start(ap, how);
2578 while ((sig = va_arg(ap, int)) > 0)
2579 assert_se(sigaddset(&ss, sig) == 0);
2580 va_end(ap);
2581
2582 if (sigprocmask(how, &ss, NULL) < 0)
2583 return -errno;
2584
2585 return 0;
2586 }
2587
2588 char* gethostname_malloc(void) {
2589 struct utsname u;
2590
2591 assert_se(uname(&u) >= 0);
2592
2593 if (!isempty(u.nodename) && !streq(u.nodename, "(none)"))
2594 return strdup(u.nodename);
2595
2596 return strdup(u.sysname);
2597 }
2598
2599 bool hostname_is_set(void) {
2600 struct utsname u;
2601
2602 assert_se(uname(&u) >= 0);
2603
2604 return !isempty(u.nodename) && !streq(u.nodename, "(none)");
2605 }
2606
2607 char *lookup_uid(uid_t uid) {
2608 long bufsize;
2609 char *name;
2610 _cleanup_free_ char *buf = NULL;
2611 struct passwd pwbuf, *pw = NULL;
2612
2613 /* Shortcut things to avoid NSS lookups */
2614 if (uid == 0)
2615 return strdup("root");
2616
2617 bufsize = sysconf(_SC_GETPW_R_SIZE_MAX);
2618 if (bufsize <= 0)
2619 bufsize = 4096;
2620
2621 buf = malloc(bufsize);
2622 if (!buf)
2623 return NULL;
2624
2625 if (getpwuid_r(uid, &pwbuf, buf, bufsize, &pw) == 0 && pw)
2626 return strdup(pw->pw_name);
2627
2628 if (asprintf(&name, UID_FMT, uid) < 0)
2629 return NULL;
2630
2631 return name;
2632 }
2633
2634 char* getlogname_malloc(void) {
2635 uid_t uid;
2636 struct stat st;
2637
2638 if (isatty(STDIN_FILENO) && fstat(STDIN_FILENO, &st) >= 0)
2639 uid = st.st_uid;
2640 else
2641 uid = getuid();
2642
2643 return lookup_uid(uid);
2644 }
2645
2646 char *getusername_malloc(void) {
2647 const char *e;
2648
2649 e = getenv("USER");
2650 if (e)
2651 return strdup(e);
2652
2653 return lookup_uid(getuid());
2654 }
2655
2656 int getttyname_malloc(int fd, char **r) {
2657 char path[PATH_MAX], *c;
2658 int k;
2659
2660 assert(r);
2661
2662 k = ttyname_r(fd, path, sizeof(path));
2663 if (k > 0)
2664 return -k;
2665
2666 char_array_0(path);
2667
2668 c = strdup(startswith(path, "/dev/") ? path + 5 : path);
2669 if (!c)
2670 return -ENOMEM;
2671
2672 *r = c;
2673 return 0;
2674 }
2675
2676 int getttyname_harder(int fd, char **r) {
2677 int k;
2678 char *s;
2679
2680 k = getttyname_malloc(fd, &s);
2681 if (k < 0)
2682 return k;
2683
2684 if (streq(s, "tty")) {
2685 free(s);
2686 return get_ctty(0, NULL, r);
2687 }
2688
2689 *r = s;
2690 return 0;
2691 }
2692
2693 int get_ctty_devnr(pid_t pid, dev_t *d) {
2694 int r;
2695 _cleanup_free_ char *line = NULL;
2696 const char *p;
2697 unsigned long ttynr;
2698
2699 assert(pid >= 0);
2700
2701 p = procfs_file_alloca(pid, "stat");
2702 r = read_one_line_file(p, &line);
2703 if (r < 0)
2704 return r;
2705
2706 p = strrchr(line, ')');
2707 if (!p)
2708 return -EIO;
2709
2710 p++;
2711
2712 if (sscanf(p, " "
2713 "%*c " /* state */
2714 "%*d " /* ppid */
2715 "%*d " /* pgrp */
2716 "%*d " /* session */
2717 "%lu ", /* ttynr */
2718 &ttynr) != 1)
2719 return -EIO;
2720
2721 if (major(ttynr) == 0 && minor(ttynr) == 0)
2722 return -ENOENT;
2723
2724 if (d)
2725 *d = (dev_t) ttynr;
2726
2727 return 0;
2728 }
2729
2730 int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
2731 char fn[sizeof("/dev/char/")-1 + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL;
2732 _cleanup_free_ char *s = NULL;
2733 const char *p;
2734 dev_t devnr;
2735 int k;
2736
2737 assert(r);
2738
2739 k = get_ctty_devnr(pid, &devnr);
2740 if (k < 0)
2741 return k;
2742
2743 snprintf(fn, sizeof(fn), "/dev/char/%u:%u", major(devnr), minor(devnr));
2744
2745 k = readlink_malloc(fn, &s);
2746 if (k < 0) {
2747
2748 if (k != -ENOENT)
2749 return k;
2750
2751 /* This is an ugly hack */
2752 if (major(devnr) == 136) {
2753 asprintf(&b, "pts/%u", minor(devnr));
2754 goto finish;
2755 }
2756
2757 /* Probably something like the ptys which have no
2758 * symlink in /dev/char. Let's return something
2759 * vaguely useful. */
2760
2761 b = strdup(fn + 5);
2762 goto finish;
2763 }
2764
2765 if (startswith(s, "/dev/"))
2766 p = s + 5;
2767 else if (startswith(s, "../"))
2768 p = s + 3;
2769 else
2770 p = s;
2771
2772 b = strdup(p);
2773
2774 finish:
2775 if (!b)
2776 return -ENOMEM;
2777
2778 *r = b;
2779 if (_devnr)
2780 *_devnr = devnr;
2781
2782 return 0;
2783 }
2784
2785 int rm_rf_children_dangerous(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) {
2786 _cleanup_closedir_ DIR *d = NULL;
2787 int ret = 0;
2788
2789 assert(fd >= 0);
2790
2791 /* This returns the first error we run into, but nevertheless
2792 * tries to go on. This closes the passed fd. */
2793
2794 d = fdopendir(fd);
2795 if (!d) {
2796 safe_close(fd);
2797
2798 return errno == ENOENT ? 0 : -errno;
2799 }
2800
2801 for (;;) {
2802 struct dirent *de;
2803 bool is_dir, keep_around;
2804 struct stat st;
2805 int r;
2806
2807 errno = 0;
2808 de = readdir(d);
2809 if (!de) {
2810 if (errno != 0 && ret == 0)
2811 ret = -errno;
2812 return ret;
2813 }
2814
2815 if (streq(de->d_name, ".") || streq(de->d_name, ".."))
2816 continue;
2817
2818 if (de->d_type == DT_UNKNOWN ||
2819 honour_sticky ||
2820 (de->d_type == DT_DIR && root_dev)) {
2821 if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
2822 if (ret == 0 && errno != ENOENT)
2823 ret = -errno;
2824 continue;
2825 }
2826
2827 is_dir = S_ISDIR(st.st_mode);
2828 keep_around =
2829 honour_sticky &&
2830 (st.st_uid == 0 || st.st_uid == getuid()) &&
2831 (st.st_mode & S_ISVTX);
2832 } else {
2833 is_dir = de->d_type == DT_DIR;
2834 keep_around = false;
2835 }
2836
2837 if (is_dir) {
2838 int subdir_fd;
2839
2840 /* if root_dev is set, remove subdirectories only, if device is same as dir */
2841 if (root_dev && st.st_dev != root_dev->st_dev)
2842 continue;
2843
2844 subdir_fd = openat(fd, de->d_name,
2845 O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
2846 if (subdir_fd < 0) {
2847 if (ret == 0 && errno != ENOENT)
2848 ret = -errno;
2849 continue;
2850 }
2851
2852 r = rm_rf_children_dangerous(subdir_fd, only_dirs, honour_sticky, root_dev);
2853 if (r < 0 && ret == 0)
2854 ret = r;
2855
2856 if (!keep_around)
2857 if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) {
2858 if (ret == 0 && errno != ENOENT)
2859 ret = -errno;
2860 }
2861
2862 } else if (!only_dirs && !keep_around) {
2863
2864 if (unlinkat(fd, de->d_name, 0) < 0) {
2865 if (ret == 0 && errno != ENOENT)
2866 ret = -errno;
2867 }
2868 }
2869 }
2870 }
2871
2872 _pure_ static int is_temporary_fs(struct statfs *s) {
2873 assert(s);
2874
2875 return F_TYPE_EQUAL(s->f_type, TMPFS_MAGIC) ||
2876 F_TYPE_EQUAL(s->f_type, RAMFS_MAGIC);
2877 }
2878
2879 int rm_rf_children(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) {
2880 struct statfs s;
2881
2882 assert(fd >= 0);
2883
2884 if (fstatfs(fd, &s) < 0) {
2885 safe_close(fd);
2886 return -errno;
2887 }
2888
2889 /* We refuse to clean disk file systems with this call. This
2890 * is extra paranoia just to be sure we never ever remove
2891 * non-state data */
2892 if (!is_temporary_fs(&s)) {
2893 log_error("Attempted to remove disk file system, and we can't allow that.");
2894 safe_close(fd);
2895 return -EPERM;
2896 }
2897
2898 return rm_rf_children_dangerous(fd, only_dirs, honour_sticky, root_dev);
2899 }
2900
2901 static int rm_rf_internal(const char *path, bool only_dirs, bool delete_root, bool honour_sticky, bool dangerous) {
2902 int fd, r;
2903 struct statfs s;
2904
2905 assert(path);
2906
2907 /* We refuse to clean the root file system with this
2908 * call. This is extra paranoia to never cause a really
2909 * seriously broken system. */
2910 if (path_equal(path, "/")) {
2911 log_error("Attempted to remove entire root file system, and we can't allow that.");
2912 return -EPERM;
2913 }
2914
2915 fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
2916 if (fd < 0) {
2917
2918 if (errno != ENOTDIR)
2919 return -errno;
2920
2921 if (!dangerous) {
2922 if (statfs(path, &s) < 0)
2923 return -errno;
2924
2925 if (!is_temporary_fs(&s)) {
2926 log_error("Attempted to remove disk file system, and we can't allow that.");
2927 return -EPERM;
2928 }
2929 }
2930
2931 if (delete_root && !only_dirs)
2932 if (unlink(path) < 0 && errno != ENOENT)
2933 return -errno;
2934
2935 return 0;
2936 }
2937
2938 if (!dangerous) {
2939 if (fstatfs(fd, &s) < 0) {
2940 safe_close(fd);
2941 return -errno;
2942 }
2943
2944 if (!is_temporary_fs(&s)) {
2945 log_error("Attempted to remove disk file system, and we can't allow that.");
2946 safe_close(fd);
2947 return -EPERM;
2948 }
2949 }
2950
2951 r = rm_rf_children_dangerous(fd, only_dirs, honour_sticky, NULL);
2952 if (delete_root) {
2953
2954 if (honour_sticky && file_is_priv_sticky(path) > 0)
2955 return r;
2956
2957 if (rmdir(path) < 0 && errno != ENOENT) {
2958 if (r == 0)
2959 r = -errno;
2960 }
2961 }
2962
2963 return r;
2964 }
2965
2966 int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) {
2967 return rm_rf_internal(path, only_dirs, delete_root, honour_sticky, false);
2968 }
2969
2970 int rm_rf_dangerous(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) {
2971 return rm_rf_internal(path, only_dirs, delete_root, honour_sticky, true);
2972 }
2973
2974 int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) {
2975 assert(path);
2976
2977 /* Under the assumption that we are running privileged we
2978 * first change the access mode and only then hand out
2979 * ownership to avoid a window where access is too open. */
2980
2981 if (mode != (mode_t) -1)
2982 if (chmod(path, mode) < 0)
2983 return -errno;
2984
2985 if (uid != (uid_t) -1 || gid != (gid_t) -1)
2986 if (chown(path, uid, gid) < 0)
2987 return -errno;
2988
2989 return 0;
2990 }
2991
2992 int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid) {
2993 assert(fd >= 0);
2994
2995 /* Under the assumption that we are running privileged we
2996 * first change the access mode and only then hand out
2997 * ownership to avoid a window where access is too open. */
2998
2999 if (mode != (mode_t) -1)
3000 if (fchmod(fd, mode) < 0)
3001 return -errno;
3002
3003 if (uid != (uid_t) -1 || gid != (gid_t) -1)
3004 if (fchown(fd, uid, gid) < 0)
3005 return -errno;
3006
3007 return 0;
3008 }
3009
3010 cpu_set_t* cpu_set_malloc(unsigned *ncpus) {
3011 cpu_set_t *r;
3012 unsigned n = 1024;
3013
3014 /* Allocates the cpuset in the right size */
3015
3016 for (;;) {
3017 if (!(r = CPU_ALLOC(n)))
3018 return NULL;
3019
3020 if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), r) >= 0) {
3021 CPU_ZERO_S(CPU_ALLOC_SIZE(n), r);
3022
3023 if (ncpus)
3024 *ncpus = n;
3025
3026 return r;
3027 }
3028
3029 CPU_FREE(r);
3030
3031 if (errno != EINVAL)
3032 return NULL;
3033
3034 n *= 2;
3035 }
3036 }
3037
3038 int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) {
3039 static const char status_indent[] = " "; /* "[" STATUS "] " */
3040 _cleanup_free_ char *s = NULL;
3041 _cleanup_close_ int fd = -1;
3042 struct iovec iovec[6] = {};
3043 int n = 0;
3044 static bool prev_ephemeral;
3045
3046 assert(format);
3047
3048 /* This is independent of logging, as status messages are
3049 * optional and go exclusively to the console. */
3050
3051 if (vasprintf(&s, format, ap) < 0)
3052 return log_oom();
3053
3054 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
3055 if (fd < 0)
3056 return fd;
3057
3058 if (ellipse) {
3059 char *e;
3060 size_t emax, sl;
3061 int c;
3062
3063 c = fd_columns(fd);
3064 if (c <= 0)
3065 c = 80;
3066
3067 sl = status ? sizeof(status_indent)-1 : 0;
3068
3069 emax = c - sl - 1;
3070 if (emax < 3)
3071 emax = 3;
3072
3073 e = ellipsize(s, emax, 50);
3074 if (e) {
3075 free(s);
3076 s = e;
3077 }
3078 }
3079
3080 if (prev_ephemeral)
3081 IOVEC_SET_STRING(iovec[n++], "\r" ANSI_ERASE_TO_END_OF_LINE);
3082 prev_ephemeral = ephemeral;
3083
3084 if (status) {
3085 if (!isempty(status)) {
3086 IOVEC_SET_STRING(iovec[n++], "[");
3087 IOVEC_SET_STRING(iovec[n++], status);
3088 IOVEC_SET_STRING(iovec[n++], "] ");
3089 } else
3090 IOVEC_SET_STRING(iovec[n++], status_indent);
3091 }
3092
3093 IOVEC_SET_STRING(iovec[n++], s);
3094 if (!ephemeral)
3095 IOVEC_SET_STRING(iovec[n++], "\n");
3096
3097 if (writev(fd, iovec, n) < 0)
3098 return -errno;
3099
3100 return 0;
3101 }
3102
3103 int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) {
3104 va_list ap;
3105 int r;
3106
3107 assert(format);
3108
3109 va_start(ap, format);
3110 r = status_vprintf(status, ellipse, ephemeral, format, ap);
3111 va_end(ap);
3112
3113 return r;
3114 }
3115
3116 char *replace_env(const char *format, char **env) {
3117 enum {
3118 WORD,
3119 CURLY,
3120 VARIABLE
3121 } state = WORD;
3122
3123 const char *e, *word = format;
3124 char *r = NULL, *k;
3125
3126 assert(format);
3127
3128 for (e = format; *e; e ++) {
3129
3130 switch (state) {
3131
3132 case WORD:
3133 if (*e == '$')
3134 state = CURLY;
3135 break;
3136
3137 case CURLY:
3138 if (*e == '{') {
3139 if (!(k = strnappend(r, word, e-word-1)))
3140 goto fail;
3141
3142 free(r);
3143 r = k;
3144
3145 word = e-1;
3146 state = VARIABLE;
3147
3148 } else if (*e == '$') {
3149 if (!(k = strnappend(r, word, e-word)))
3150 goto fail;
3151
3152 free(r);
3153 r = k;
3154
3155 word = e+1;
3156 state = WORD;
3157 } else
3158 state = WORD;
3159 break;
3160
3161 case VARIABLE:
3162 if (*e == '}') {
3163 const char *t;
3164
3165 t = strempty(strv_env_get_n(env, word+2, e-word-2));
3166
3167 k = strappend(r, t);
3168 if (!k)
3169 goto fail;
3170
3171 free(r);
3172 r = k;
3173
3174 word = e+1;
3175 state = WORD;
3176 }
3177 break;
3178 }
3179 }
3180
3181 if (!(k = strnappend(r, word, e-word)))
3182 goto fail;
3183
3184 free(r);
3185 return k;
3186
3187 fail:
3188 free(r);
3189 return NULL;
3190 }
3191
3192 char **replace_env_argv(char **argv, char **env) {
3193 char **ret, **i;
3194 unsigned k = 0, l = 0;
3195
3196 l = strv_length(argv);
3197
3198 ret = new(char*, l+1);
3199 if (!ret)
3200 return NULL;
3201
3202 STRV_FOREACH(i, argv) {
3203
3204 /* If $FOO appears as single word, replace it by the split up variable */
3205 if ((*i)[0] == '$' && (*i)[1] != '{') {
3206 char *e;
3207 char **w, **m;
3208 unsigned q;
3209
3210 e = strv_env_get(env, *i+1);
3211 if (e) {
3212 int r;
3213
3214 r = strv_split_quoted(&m, e);
3215 if (r < 0) {
3216 ret[k] = NULL;
3217 strv_free(ret);
3218 return NULL;
3219 }
3220 } else
3221 m = NULL;
3222
3223 q = strv_length(m);
3224 l = l + q - 1;
3225
3226 w = realloc(ret, sizeof(char*) * (l+1));
3227 if (!w) {
3228 ret[k] = NULL;
3229 strv_free(ret);
3230 strv_free(m);
3231 return NULL;
3232 }
3233
3234 ret = w;
3235 if (m) {
3236 memcpy(ret + k, m, q * sizeof(char*));
3237 free(m);
3238 }
3239
3240 k += q;
3241 continue;
3242 }
3243
3244 /* If ${FOO} appears as part of a word, replace it by the variable as-is */
3245 ret[k] = replace_env(*i, env);
3246 if (!ret[k]) {
3247 strv_free(ret);
3248 return NULL;
3249 }
3250 k++;
3251 }
3252
3253 ret[k] = NULL;
3254 return ret;
3255 }
3256
3257 int fd_columns(int fd) {
3258 struct winsize ws = {};
3259
3260 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
3261 return -errno;
3262
3263 if (ws.ws_col <= 0)
3264 return -EIO;
3265
3266 return ws.ws_col;
3267 }
3268
3269 unsigned columns(void) {
3270 const char *e;
3271 int c;
3272
3273 if (_likely_(cached_columns > 0))
3274 return cached_columns;
3275
3276 c = 0;
3277 e = getenv("COLUMNS");
3278 if (e)
3279 safe_atoi(e, &c);
3280
3281 if (c <= 0)
3282 c = fd_columns(STDOUT_FILENO);
3283
3284 if (c <= 0)
3285 c = 80;
3286
3287 cached_columns = c;
3288 return c;
3289 }
3290
3291 int fd_lines(int fd) {
3292 struct winsize ws = {};
3293
3294 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
3295 return -errno;
3296
3297 if (ws.ws_row <= 0)
3298 return -EIO;
3299
3300 return ws.ws_row;
3301 }
3302
3303 unsigned lines(void) {
3304 const char *e;
3305 unsigned l;
3306
3307 if (_likely_(cached_lines > 0))
3308 return cached_lines;
3309
3310 l = 0;
3311 e = getenv("LINES");
3312 if (e)
3313 safe_atou(e, &l);
3314
3315 if (l <= 0)
3316 l = fd_lines(STDOUT_FILENO);
3317
3318 if (l <= 0)
3319 l = 24;
3320
3321 cached_lines = l;
3322 return cached_lines;
3323 }
3324
3325 /* intended to be used as a SIGWINCH sighandler */
3326 void columns_lines_cache_reset(int signum) {
3327 cached_columns = 0;
3328 cached_lines = 0;
3329 }
3330
3331 bool on_tty(void) {
3332 static int cached_on_tty = -1;
3333
3334 if (_unlikely_(cached_on_tty < 0))
3335 cached_on_tty = isatty(STDOUT_FILENO) > 0;
3336
3337 return cached_on_tty;
3338 }
3339
3340 int files_same(const char *filea, const char *fileb) {
3341 struct stat a, b;
3342
3343 if (stat(filea, &a) < 0)
3344 return -errno;
3345
3346 if (stat(fileb, &b) < 0)
3347 return -errno;
3348
3349 return a.st_dev == b.st_dev &&
3350 a.st_ino == b.st_ino;
3351 }
3352
3353 int running_in_chroot(void) {
3354 int ret;
3355
3356 ret = files_same("/proc/1/root", "/");
3357 if (ret < 0)
3358 return ret;
3359
3360 return ret == 0;
3361 }
3362
3363 static char *ascii_ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) {
3364 size_t x;
3365 char *r;
3366
3367 assert(s);
3368 assert(percent <= 100);
3369 assert(new_length >= 3);
3370
3371 if (old_length <= 3 || old_length <= new_length)
3372 return strndup(s, old_length);
3373
3374 r = new0(char, new_length+1);
3375 if (!r)
3376 return NULL;
3377
3378 x = (new_length * percent) / 100;
3379
3380 if (x > new_length - 3)
3381 x = new_length - 3;
3382
3383 memcpy(r, s, x);
3384 r[x] = '.';
3385 r[x+1] = '.';
3386 r[x+2] = '.';
3387 memcpy(r + x + 3,
3388 s + old_length - (new_length - x - 3),
3389 new_length - x - 3);
3390
3391 return r;
3392 }
3393
3394 char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) {
3395 size_t x;
3396 char *e;
3397 const char *i, *j;
3398 unsigned k, len, len2;
3399
3400 assert(s);
3401 assert(percent <= 100);
3402 assert(new_length >= 3);
3403
3404 /* if no multibyte characters use ascii_ellipsize_mem for speed */
3405 if (ascii_is_valid(s))
3406 return ascii_ellipsize_mem(s, old_length, new_length, percent);
3407
3408 if (old_length <= 3 || old_length <= new_length)
3409 return strndup(s, old_length);
3410
3411 x = (new_length * percent) / 100;
3412
3413 if (x > new_length - 3)
3414 x = new_length - 3;
3415
3416 k = 0;
3417 for (i = s; k < x && i < s + old_length; i = utf8_next_char(i)) {
3418 int c;
3419
3420 c = utf8_encoded_to_unichar(i);
3421 if (c < 0)
3422 return NULL;
3423 k += unichar_iswide(c) ? 2 : 1;
3424 }
3425
3426 if (k > x) /* last character was wide and went over quota */
3427 x ++;
3428
3429 for (j = s + old_length; k < new_length && j > i; ) {
3430 int c;
3431
3432 j = utf8_prev_char(j);
3433 c = utf8_encoded_to_unichar(j);
3434 if (c < 0)
3435 return NULL;
3436 k += unichar_iswide(c) ? 2 : 1;
3437 }
3438 assert(i <= j);
3439
3440 /* we don't actually need to ellipsize */
3441 if (i == j)
3442 return memdup(s, old_length + 1);
3443
3444 /* make space for ellipsis */
3445 j = utf8_next_char(j);
3446
3447 len = i - s;
3448 len2 = s + old_length - j;
3449 e = new(char, len + 3 + len2 + 1);
3450 if (!e)
3451 return NULL;
3452
3453 /*
3454 printf("old_length=%zu new_length=%zu x=%zu len=%u len2=%u k=%u\n",
3455 old_length, new_length, x, len, len2, k);
3456 */
3457
3458 memcpy(e, s, len);
3459 e[len] = 0xe2; /* tri-dot ellipsis: … */
3460 e[len + 1] = 0x80;
3461 e[len + 2] = 0xa6;
3462
3463 memcpy(e + len + 3, j, len2 + 1);
3464
3465 return e;
3466 }
3467
3468 char *ellipsize(const char *s, size_t length, unsigned percent) {
3469 return ellipsize_mem(s, strlen(s), length, percent);
3470 }
3471
3472 int touch_file(const char *path, bool parents, usec_t stamp, uid_t uid, gid_t gid, mode_t mode) {
3473 _cleanup_close_ int fd;
3474 int r;
3475
3476 assert(path);
3477
3478 if (parents)
3479 mkdir_parents(path, 0755);
3480
3481 fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode > 0 ? mode : 0644);
3482 if (fd < 0)
3483 return -errno;
3484
3485 if (mode > 0) {
3486 r = fchmod(fd, mode);
3487 if (r < 0)
3488 return -errno;
3489 }
3490
3491 if (uid != (uid_t) -1 || gid != (gid_t) -1) {
3492 r = fchown(fd, uid, gid);
3493 if (r < 0)
3494 return -errno;
3495 }
3496
3497 if (stamp != USEC_INFINITY) {
3498 struct timespec ts[2];
3499
3500 timespec_store(&ts[0], stamp);
3501 ts[1] = ts[0];
3502 r = futimens(fd, ts);
3503 } else
3504 r = futimens(fd, NULL);
3505 if (r < 0)
3506 return -errno;
3507
3508 return 0;
3509 }
3510
3511 int touch(const char *path) {
3512 return touch_file(path, false, USEC_INFINITY, (uid_t) -1, (gid_t) -1, 0);
3513 }
3514
3515 char *unquote(const char *s, const char* quotes) {
3516 size_t l;
3517 assert(s);
3518
3519 /* This is rather stupid, simply removes the heading and
3520 * trailing quotes if there is one. Doesn't care about
3521 * escaping or anything. We should make this smarter one
3522 * day...*/
3523
3524 l = strlen(s);
3525 if (l < 2)
3526 return strdup(s);
3527
3528 if (strchr(quotes, s[0]) && s[l-1] == s[0])
3529 return strndup(s+1, l-2);
3530
3531 return strdup(s);
3532 }
3533
3534 char *normalize_env_assignment(const char *s) {
3535 _cleanup_free_ char *name = NULL, *value = NULL, *p = NULL;
3536 char *eq, *r;
3537
3538 eq = strchr(s, '=');
3539 if (!eq) {
3540 char *t;
3541
3542 r = strdup(s);
3543 if (!r)
3544 return NULL;
3545
3546 t = strstrip(r);
3547 if (t == r)
3548 return r;
3549
3550 memmove(r, t, strlen(t) + 1);
3551 return r;
3552 }
3553
3554 name = strndup(s, eq - s);
3555 if (!name)
3556 return NULL;
3557
3558 p = strdup(eq + 1);
3559 if (!p)
3560 return NULL;
3561
3562 value = unquote(strstrip(p), QUOTES);
3563 if (!value)
3564 return NULL;
3565
3566 if (asprintf(&r, "%s=%s", strstrip(name), value) < 0)
3567 r = NULL;
3568
3569 return r;
3570 }
3571
3572 int wait_for_terminate(pid_t pid, siginfo_t *status) {
3573 siginfo_t dummy;
3574
3575 assert(pid >= 1);
3576
3577 if (!status)
3578 status = &dummy;
3579
3580 for (;;) {
3581 zero(*status);
3582
3583 if (waitid(P_PID, pid, status, WEXITED) < 0) {
3584
3585 if (errno == EINTR)
3586 continue;
3587
3588 return -errno;
3589 }
3590
3591 return 0;
3592 }
3593 }
3594
3595 /*
3596 * Return values:
3597 * < 0 : wait_for_terminate() failed to get the state of the
3598 * process, the process was terminated by a signal, or
3599 * failed for an unknown reason.
3600 * >=0 : The process terminated normally, and its exit code is
3601 * returned.
3602 *
3603 * That is, success is indicated by a return value of zero, and an
3604 * error is indicated by a non-zero value.
3605 */
3606 int wait_for_terminate_and_warn(const char *name, pid_t pid) {
3607 int r;
3608 siginfo_t status;
3609
3610 assert(name);
3611 assert(pid > 1);
3612
3613 r = wait_for_terminate(pid, &status);
3614 if (r < 0) {
3615 log_warning("Failed to wait for %s: %s", name, strerror(-r));
3616 return r;
3617 }
3618
3619 if (status.si_code == CLD_EXITED) {
3620 if (status.si_status != 0) {
3621 log_warning("%s failed with error code %i.", name, status.si_status);
3622 return status.si_status;
3623 }
3624
3625 log_debug("%s succeeded.", name);
3626 return 0;
3627
3628 } else if (status.si_code == CLD_KILLED ||
3629 status.si_code == CLD_DUMPED) {
3630
3631 log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status));
3632 return -EPROTO;
3633 }
3634
3635 log_warning("%s failed due to unknown reason.", name);
3636 return -EPROTO;
3637 }
3638
3639 noreturn void freeze(void) {
3640
3641 /* Make sure nobody waits for us on a socket anymore */
3642 close_all_fds(NULL, 0);
3643
3644 sync();
3645
3646 for (;;)
3647 pause();
3648 }
3649
3650 bool null_or_empty(struct stat *st) {
3651 assert(st);
3652
3653 if (S_ISREG(st->st_mode) && st->st_size <= 0)
3654 return true;
3655
3656 if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode))
3657 return true;
3658
3659 return false;
3660 }
3661
3662 int null_or_empty_path(const char *fn) {
3663 struct stat st;
3664
3665 assert(fn);
3666
3667 if (stat(fn, &st) < 0)
3668 return -errno;
3669
3670 return null_or_empty(&st);
3671 }
3672
3673 int null_or_empty_fd(int fd) {
3674 struct stat st;
3675
3676 assert(fd >= 0);
3677
3678 if (fstat(fd, &st) < 0)
3679 return -errno;
3680
3681 return null_or_empty(&st);
3682 }
3683
3684 DIR *xopendirat(int fd, const char *name, int flags) {
3685 int nfd;
3686 DIR *d;
3687
3688 assert(!(flags & O_CREAT));
3689
3690 nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags, 0);
3691 if (nfd < 0)
3692 return NULL;
3693
3694 d = fdopendir(nfd);
3695 if (!d) {
3696 safe_close(nfd);
3697 return NULL;
3698 }
3699
3700 return d;
3701 }
3702
3703 int signal_from_string_try_harder(const char *s) {
3704 int signo;
3705 assert(s);
3706
3707 signo = signal_from_string(s);
3708 if (signo <= 0)
3709 if (startswith(s, "SIG"))
3710 return signal_from_string(s+3);
3711
3712 return signo;
3713 }
3714
3715 static char *tag_to_udev_node(const char *tagvalue, const char *by) {
3716 _cleanup_free_ char *t = NULL, *u = NULL;
3717 size_t enc_len;
3718
3719 u = unquote(tagvalue, "\"\'");
3720 if (!u)
3721 return NULL;
3722
3723 enc_len = strlen(u) * 4 + 1;
3724 t = new(char, enc_len);
3725 if (!t)
3726 return NULL;
3727
3728 if (encode_devnode_name(u, t, enc_len) < 0)
3729 return NULL;
3730
3731 return strjoin("/dev/disk/by-", by, "/", t, NULL);
3732 }
3733
3734 char *fstab_node_to_udev_node(const char *p) {
3735 assert(p);
3736
3737 if (startswith(p, "LABEL="))
3738 return tag_to_udev_node(p+6, "label");
3739
3740 if (startswith(p, "UUID="))
3741 return tag_to_udev_node(p+5, "uuid");
3742
3743 if (startswith(p, "PARTUUID="))
3744 return tag_to_udev_node(p+9, "partuuid");
3745
3746 if (startswith(p, "PARTLABEL="))
3747 return tag_to_udev_node(p+10, "partlabel");
3748
3749 return strdup(p);
3750 }
3751
3752 bool tty_is_vc(const char *tty) {
3753 assert(tty);
3754
3755 return vtnr_from_tty(tty) >= 0;
3756 }
3757
3758 bool tty_is_console(const char *tty) {
3759 assert(tty);
3760
3761 if (startswith(tty, "/dev/"))
3762 tty += 5;
3763
3764 return streq(tty, "console");
3765 }
3766
3767 int vtnr_from_tty(const char *tty) {
3768 int i, r;
3769
3770 assert(tty);
3771
3772 if (startswith(tty, "/dev/"))
3773 tty += 5;
3774
3775 if (!startswith(tty, "tty") )
3776 return -EINVAL;
3777
3778 if (tty[3] < '0' || tty[3] > '9')
3779 return -EINVAL;
3780
3781 r = safe_atoi(tty+3, &i);
3782 if (r < 0)
3783 return r;
3784
3785 if (i < 0 || i > 63)
3786 return -EINVAL;
3787
3788 return i;
3789 }
3790
3791 char *resolve_dev_console(char **active) {
3792 char *tty;
3793
3794 /* Resolve where /dev/console is pointing to, if /sys is actually ours
3795 * (i.e. not read-only-mounted which is a sign for container setups) */
3796
3797 if (path_is_read_only_fs("/sys") > 0)
3798 return NULL;
3799
3800 if (read_one_line_file("/sys/class/tty/console/active", active) < 0)
3801 return NULL;
3802
3803 /* If multiple log outputs are configured the last one is what
3804 * /dev/console points to */
3805 tty = strrchr(*active, ' ');
3806 if (tty)
3807 tty++;
3808 else
3809 tty = *active;
3810
3811 if (streq(tty, "tty0")) {
3812 char *tmp;
3813
3814 /* Get the active VC (e.g. tty1) */
3815 if (read_one_line_file("/sys/class/tty/tty0/active", &tmp) >= 0) {
3816 free(*active);
3817 tty = *active = tmp;
3818 }
3819 }
3820
3821 return tty;
3822 }
3823
3824 bool tty_is_vc_resolve(const char *tty) {
3825 _cleanup_free_ char *active = NULL;
3826
3827 assert(tty);
3828
3829 if (startswith(tty, "/dev/"))
3830 tty += 5;
3831
3832 if (streq(tty, "console")) {
3833 tty = resolve_dev_console(&active);
3834 if (!tty)
3835 return false;
3836 }
3837
3838 return tty_is_vc(tty);
3839 }
3840
3841 const char *default_term_for_tty(const char *tty) {
3842 assert(tty);
3843
3844 return tty_is_vc_resolve(tty) ? "TERM=linux" : "TERM=vt102";
3845 }
3846
3847 bool dirent_is_file(const struct dirent *de) {
3848 assert(de);
3849
3850 if (ignore_file(de->d_name))
3851 return false;
3852
3853 if (de->d_type != DT_REG &&
3854 de->d_type != DT_LNK &&
3855 de->d_type != DT_UNKNOWN)
3856 return false;
3857
3858 return true;
3859 }
3860
3861 bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) {
3862 assert(de);
3863
3864 if (de->d_type != DT_REG &&
3865 de->d_type != DT_LNK &&
3866 de->d_type != DT_UNKNOWN)
3867 return false;
3868
3869 if (ignore_file_allow_backup(de->d_name))
3870 return false;
3871
3872 return endswith(de->d_name, suffix);
3873 }
3874
3875 void execute_directory(const char *directory, DIR *d, usec_t timeout, char *argv[]) {
3876 pid_t executor_pid;
3877 int r;
3878
3879 assert(directory);
3880
3881 /* Executes all binaries in a directory in parallel and waits
3882 * for them to finish. Optionally a timeout is applied. */
3883
3884 executor_pid = fork();
3885 if (executor_pid < 0) {
3886 log_error("Failed to fork: %m");
3887 return;
3888
3889 } else if (executor_pid == 0) {
3890 _cleanup_hashmap_free_free_ Hashmap *pids = NULL;
3891 _cleanup_closedir_ DIR *_d = NULL;
3892 struct dirent *de;
3893
3894 /* We fork this all off from a child process so that
3895 * we can somewhat cleanly make use of SIGALRM to set
3896 * a time limit */
3897
3898 reset_all_signal_handlers();
3899 reset_signal_mask();
3900
3901 assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
3902
3903 if (!d) {
3904 d = _d = opendir(directory);
3905 if (!d) {
3906 if (errno == ENOENT)
3907 _exit(EXIT_SUCCESS);
3908
3909 log_error("Failed to enumerate directory %s: %m", directory);
3910 _exit(EXIT_FAILURE);
3911 }
3912 }
3913
3914 pids = hashmap_new(NULL);
3915 if (!pids) {
3916 log_oom();
3917 _exit(EXIT_FAILURE);
3918 }
3919
3920 FOREACH_DIRENT(de, d, break) {
3921 _cleanup_free_ char *path = NULL;
3922 pid_t pid;
3923
3924 if (!dirent_is_file(de))
3925 continue;
3926
3927 path = strjoin(directory, "/", de->d_name, NULL);
3928 if (!path) {
3929 log_oom();
3930 _exit(EXIT_FAILURE);
3931 }
3932
3933 pid = fork();
3934 if (pid < 0) {
3935 log_error("Failed to fork: %m");
3936 continue;
3937 } else if (pid == 0) {
3938 char *_argv[2];
3939
3940 assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
3941
3942 if (!argv) {
3943 _argv[0] = path;
3944 _argv[1] = NULL;
3945 argv = _argv;
3946 } else
3947 argv[0] = path;
3948
3949 execv(path, argv);
3950 log_error("Failed to execute %s: %m", path);
3951 _exit(EXIT_FAILURE);
3952 }
3953
3954 log_debug("Spawned %s as " PID_FMT ".", path, pid);
3955
3956 r = hashmap_put(pids, UINT_TO_PTR(pid), path);
3957 if (r < 0) {
3958 log_oom();
3959 _exit(EXIT_FAILURE);
3960 }
3961
3962 path = NULL;
3963 }
3964
3965 /* Abort execution of this process after the
3966 * timout. We simply rely on SIGALRM as default action
3967 * terminating the process, and turn on alarm(). */
3968
3969 if (timeout != USEC_INFINITY)
3970 alarm((timeout + USEC_PER_SEC - 1) / USEC_PER_SEC);
3971
3972 while (!hashmap_isempty(pids)) {
3973 _cleanup_free_ char *path = NULL;
3974 pid_t pid;
3975
3976 pid = PTR_TO_UINT(hashmap_first_key(pids));
3977 assert(pid > 0);
3978
3979 path = hashmap_remove(pids, UINT_TO_PTR(pid));
3980 assert(path);
3981
3982 wait_for_terminate_and_warn(path, pid);
3983 }
3984
3985 _exit(EXIT_SUCCESS);
3986 }
3987
3988 wait_for_terminate_and_warn(directory, executor_pid);
3989 }
3990
3991 int kill_and_sigcont(pid_t pid, int sig) {
3992 int r;
3993
3994 r = kill(pid, sig) < 0 ? -errno : 0;
3995
3996 if (r >= 0)
3997 kill(pid, SIGCONT);
3998
3999 return r;
4000 }
4001
4002 bool nulstr_contains(const char*nulstr, const char *needle) {
4003 const char *i;
4004
4005 if (!nulstr)
4006 return false;
4007
4008 NULSTR_FOREACH(i, nulstr)
4009 if (streq(i, needle))
4010 return true;
4011
4012 return false;
4013 }
4014
4015 bool plymouth_running(void) {
4016 return access("/run/plymouth/pid", F_OK) >= 0;
4017 }
4018
4019 char* strshorten(char *s, size_t l) {
4020 assert(s);
4021
4022 if (l < strlen(s))
4023 s[l] = 0;
4024
4025 return s;
4026 }
4027
4028 static bool hostname_valid_char(char c) {
4029 return
4030 (c >= 'a' && c <= 'z') ||
4031 (c >= 'A' && c <= 'Z') ||
4032 (c >= '0' && c <= '9') ||
4033 c == '-' ||
4034 c == '_' ||
4035 c == '.';
4036 }
4037
4038 bool hostname_is_valid(const char *s) {
4039 const char *p;
4040 bool dot;
4041
4042 if (isempty(s))
4043 return false;
4044
4045 for (p = s, dot = true; *p; p++) {
4046 if (*p == '.') {
4047 if (dot)
4048 return false;
4049
4050 dot = true;
4051 } else {
4052 if (!hostname_valid_char(*p))
4053 return false;
4054
4055 dot = false;
4056 }
4057 }
4058
4059 if (dot)
4060 return false;
4061
4062 if (p-s > HOST_NAME_MAX)
4063 return false;
4064
4065 return true;
4066 }
4067
4068 char* hostname_cleanup(char *s, bool lowercase) {
4069 char *p, *d;
4070 bool dot;
4071
4072 for (p = s, d = s, dot = true; *p; p++) {
4073 if (*p == '.') {
4074 if (dot)
4075 continue;
4076
4077 *(d++) = '.';
4078 dot = true;
4079 } else if (hostname_valid_char(*p)) {
4080 *(d++) = lowercase ? tolower(*p) : *p;
4081 dot = false;
4082 }
4083
4084 }
4085
4086 if (dot && d > s)
4087 d[-1] = 0;
4088 else
4089 *d = 0;
4090
4091 strshorten(s, HOST_NAME_MAX);
4092
4093 return s;
4094 }
4095
4096 bool machine_name_is_valid(const char *s) {
4097
4098 if (!hostname_is_valid(s))
4099 return false;
4100
4101 /* Machine names should be useful hostnames, but also be
4102 * useful in unit names, hence we enforce a stricter length
4103 * limitation. */
4104
4105 if (strlen(s) > 64)
4106 return false;
4107
4108 return true;
4109 }
4110
4111 int pipe_eof(int fd) {
4112 struct pollfd pollfd = {
4113 .fd = fd,
4114 .events = POLLIN|POLLHUP,
4115 };
4116
4117 int r;
4118
4119 r = poll(&pollfd, 1, 0);
4120 if (r < 0)
4121 return -errno;
4122
4123 if (r == 0)
4124 return 0;
4125
4126 return pollfd.revents & POLLHUP;
4127 }
4128
4129 int fd_wait_for_event(int fd, int event, usec_t t) {
4130
4131 struct pollfd pollfd = {
4132 .fd = fd,
4133 .events = event,
4134 };
4135
4136 struct timespec ts;
4137 int r;
4138
4139 r = ppoll(&pollfd, 1, t == USEC_INFINITY ? NULL : timespec_store(&ts, t), NULL);
4140 if (r < 0)
4141 return -errno;
4142
4143 if (r == 0)
4144 return 0;
4145
4146 return pollfd.revents;
4147 }
4148
4149 int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
4150 FILE *f;
4151 char *t;
4152 int fd;
4153
4154 assert(path);
4155 assert(_f);
4156 assert(_temp_path);
4157
4158 t = tempfn_xxxxxx(path);
4159 if (!t)
4160 return -ENOMEM;
4161
4162 fd = mkostemp_safe(t, O_WRONLY|O_CLOEXEC);
4163 if (fd < 0) {
4164 free(t);
4165 return -errno;
4166 }
4167
4168 f = fdopen(fd, "we");
4169 if (!f) {
4170 unlink(t);
4171 free(t);
4172 return -errno;
4173 }
4174
4175 *_f = f;
4176 *_temp_path = t;
4177
4178 return 0;
4179 }
4180
4181 int terminal_vhangup_fd(int fd) {
4182 assert(fd >= 0);
4183
4184 if (ioctl(fd, TIOCVHANGUP) < 0)
4185 return -errno;
4186
4187 return 0;
4188 }
4189
4190 int terminal_vhangup(const char *name) {
4191 _cleanup_close_ int fd;
4192
4193 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
4194 if (fd < 0)
4195 return fd;
4196
4197 return terminal_vhangup_fd(fd);
4198 }
4199
4200 int vt_disallocate(const char *name) {
4201 int fd, r;
4202 unsigned u;
4203
4204 /* Deallocate the VT if possible. If not possible
4205 * (i.e. because it is the active one), at least clear it
4206 * entirely (including the scrollback buffer) */
4207
4208 if (!startswith(name, "/dev/"))
4209 return -EINVAL;
4210
4211 if (!tty_is_vc(name)) {
4212 /* So this is not a VT. I guess we cannot deallocate
4213 * it then. But let's at least clear the screen */
4214
4215 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
4216 if (fd < 0)
4217 return fd;
4218
4219 loop_write(fd,
4220 "\033[r" /* clear scrolling region */
4221 "\033[H" /* move home */
4222 "\033[2J", /* clear screen */
4223 10, false);
4224 safe_close(fd);
4225
4226 return 0;
4227 }
4228
4229 if (!startswith(name, "/dev/tty"))
4230 return -EINVAL;
4231
4232 r = safe_atou(name+8, &u);
4233 if (r < 0)
4234 return r;
4235
4236 if (u <= 0)
4237 return -EINVAL;
4238
4239 /* Try to deallocate */
4240 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
4241 if (fd < 0)
4242 return fd;
4243
4244 r = ioctl(fd, VT_DISALLOCATE, u);
4245 safe_close(fd);
4246
4247 if (r >= 0)
4248 return 0;
4249
4250 if (errno != EBUSY)
4251 return -errno;
4252
4253 /* Couldn't deallocate, so let's clear it fully with
4254 * scrollback */
4255 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
4256 if (fd < 0)
4257 return fd;
4258
4259 loop_write(fd,
4260 "\033[r" /* clear scrolling region */
4261 "\033[H" /* move home */
4262 "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */
4263 10, false);
4264 safe_close(fd);
4265
4266 return 0;
4267 }
4268
4269 int symlink_atomic(const char *from, const char *to) {
4270 _cleanup_free_ char *t = NULL;
4271
4272 assert(from);
4273 assert(to);
4274
4275 t = tempfn_random(to);
4276 if (!t)
4277 return -ENOMEM;
4278
4279 if (symlink(from, t) < 0)
4280 return -errno;
4281
4282 if (rename(t, to) < 0) {
4283 unlink_noerrno(t);
4284 return -errno;
4285 }
4286
4287 return 0;
4288 }
4289
4290 int mknod_atomic(const char *path, mode_t mode, dev_t dev) {
4291 _cleanup_free_ char *t = NULL;
4292
4293 assert(path);
4294
4295 t = tempfn_random(path);
4296 if (!t)
4297 return -ENOMEM;
4298
4299 if (mknod(t, mode, dev) < 0)
4300 return -errno;
4301
4302 if (rename(t, path) < 0) {
4303 unlink_noerrno(t);
4304 return -errno;
4305 }
4306
4307 return 0;
4308 }
4309
4310 int mkfifo_atomic(const char *path, mode_t mode) {
4311 _cleanup_free_ char *t = NULL;
4312
4313 assert(path);
4314
4315 t = tempfn_random(path);
4316 if (!t)
4317 return -ENOMEM;
4318
4319 if (mkfifo(t, mode) < 0)
4320 return -errno;
4321
4322 if (rename(t, path) < 0) {
4323 unlink_noerrno(t);
4324 return -errno;
4325 }
4326
4327 return 0;
4328 }
4329
4330 bool display_is_local(const char *display) {
4331 assert(display);
4332
4333 return
4334 display[0] == ':' &&
4335 display[1] >= '0' &&
4336 display[1] <= '9';
4337 }
4338
4339 int socket_from_display(const char *display, char **path) {
4340 size_t k;
4341 char *f, *c;
4342
4343 assert(display);
4344 assert(path);
4345
4346 if (!display_is_local(display))
4347 return -EINVAL;
4348
4349 k = strspn(display+1, "0123456789");
4350
4351 f = new(char, strlen("/tmp/.X11-unix/X") + k + 1);
4352 if (!f)
4353 return -ENOMEM;
4354
4355 c = stpcpy(f, "/tmp/.X11-unix/X");
4356 memcpy(c, display+1, k);
4357 c[k] = 0;
4358
4359 *path = f;
4360
4361 return 0;
4362 }
4363
4364 int get_user_creds(
4365 const char **username,
4366 uid_t *uid, gid_t *gid,
4367 const char **home,
4368 const char **shell) {
4369
4370 struct passwd *p;
4371 uid_t u;
4372
4373 assert(username);
4374 assert(*username);
4375
4376 /* We enforce some special rules for uid=0: in order to avoid
4377 * NSS lookups for root we hardcode its data. */
4378
4379 if (streq(*username, "root") || streq(*username, "0")) {
4380 *username = "root";
4381
4382 if (uid)
4383 *uid = 0;
4384
4385 if (gid)
4386 *gid = 0;
4387
4388 if (home)
4389 *home = "/root";
4390
4391 if (shell)
4392 *shell = "/bin/sh";
4393
4394 return 0;
4395 }
4396
4397 if (parse_uid(*username, &u) >= 0) {
4398 errno = 0;
4399 p = getpwuid(u);
4400
4401 /* If there are multiple users with the same id, make
4402 * sure to leave $USER to the configured value instead
4403 * of the first occurrence in the database. However if
4404 * the uid was configured by a numeric uid, then let's
4405 * pick the real username from /etc/passwd. */
4406 if (p)
4407 *username = p->pw_name;
4408 } else {
4409 errno = 0;
4410 p = getpwnam(*username);
4411 }
4412
4413 if (!p)
4414 return errno > 0 ? -errno : -ESRCH;
4415
4416 if (uid)
4417 *uid = p->pw_uid;
4418
4419 if (gid)
4420 *gid = p->pw_gid;
4421
4422 if (home)
4423 *home = p->pw_dir;
4424
4425 if (shell)
4426 *shell = p->pw_shell;
4427
4428 return 0;
4429 }
4430
4431 char* uid_to_name(uid_t uid) {
4432 struct passwd *p;
4433 char *r;
4434
4435 if (uid == 0)
4436 return strdup("root");
4437
4438 p = getpwuid(uid);
4439 if (p)
4440 return strdup(p->pw_name);
4441
4442 if (asprintf(&r, UID_FMT, uid) < 0)
4443 return NULL;
4444
4445 return r;
4446 }
4447
4448 char* gid_to_name(gid_t gid) {
4449 struct group *p;
4450 char *r;
4451
4452 if (gid == 0)
4453 return strdup("root");
4454
4455 p = getgrgid(gid);
4456 if (p)
4457 return strdup(p->gr_name);
4458
4459 if (asprintf(&r, GID_FMT, gid) < 0)
4460 return NULL;
4461
4462 return r;
4463 }
4464
4465 int get_group_creds(const char **groupname, gid_t *gid) {
4466 struct group *g;
4467 gid_t id;
4468
4469 assert(groupname);
4470
4471 /* We enforce some special rules for gid=0: in order to avoid
4472 * NSS lookups for root we hardcode its data. */
4473
4474 if (streq(*groupname, "root") || streq(*groupname, "0")) {
4475 *groupname = "root";
4476
4477 if (gid)
4478 *gid = 0;
4479
4480 return 0;
4481 }
4482
4483 if (parse_gid(*groupname, &id) >= 0) {
4484 errno = 0;
4485 g = getgrgid(id);
4486
4487 if (g)
4488 *groupname = g->gr_name;
4489 } else {
4490 errno = 0;
4491 g = getgrnam(*groupname);
4492 }
4493
4494 if (!g)
4495 return errno > 0 ? -errno : -ESRCH;
4496
4497 if (gid)
4498 *gid = g->gr_gid;
4499
4500 return 0;
4501 }
4502
4503 int in_gid(gid_t gid) {
4504 gid_t *gids;
4505 int ngroups_max, r, i;
4506
4507 if (getgid() == gid)
4508 return 1;
4509
4510 if (getegid() == gid)
4511 return 1;
4512
4513 ngroups_max = sysconf(_SC_NGROUPS_MAX);
4514 assert(ngroups_max > 0);
4515
4516 gids = alloca(sizeof(gid_t) * ngroups_max);
4517
4518 r = getgroups(ngroups_max, gids);
4519 if (r < 0)
4520 return -errno;
4521
4522 for (i = 0; i < r; i++)
4523 if (gids[i] == gid)
4524 return 1;
4525
4526 return 0;
4527 }
4528
4529 int in_group(const char *name) {
4530 int r;
4531 gid_t gid;
4532
4533 r = get_group_creds(&name, &gid);
4534 if (r < 0)
4535 return r;
4536
4537 return in_gid(gid);
4538 }
4539
4540 int glob_exists(const char *path) {
4541 _cleanup_globfree_ glob_t g = {};
4542 int k;
4543
4544 assert(path);
4545
4546 errno = 0;
4547 k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g);
4548
4549 if (k == GLOB_NOMATCH)
4550 return 0;
4551 else if (k == GLOB_NOSPACE)
4552 return -ENOMEM;
4553 else if (k == 0)
4554 return !strv_isempty(g.gl_pathv);
4555 else
4556 return errno ? -errno : -EIO;
4557 }
4558
4559 int glob_extend(char ***strv, const char *path) {
4560 _cleanup_globfree_ glob_t g = {};
4561 int k;
4562 char **p;
4563
4564 errno = 0;
4565 k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g);
4566
4567 if (k == GLOB_NOMATCH)
4568 return -ENOENT;
4569 else if (k == GLOB_NOSPACE)
4570 return -ENOMEM;
4571 else if (k != 0 || strv_isempty(g.gl_pathv))
4572 return errno ? -errno : -EIO;
4573
4574 STRV_FOREACH(p, g.gl_pathv) {
4575 k = strv_extend(strv, *p);
4576 if (k < 0)
4577 break;
4578 }
4579
4580 return k;
4581 }
4582
4583 int dirent_ensure_type(DIR *d, struct dirent *de) {
4584 struct stat st;
4585
4586 assert(d);
4587 assert(de);
4588
4589 if (de->d_type != DT_UNKNOWN)
4590 return 0;
4591
4592 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
4593 return -errno;
4594
4595 de->d_type =
4596 S_ISREG(st.st_mode) ? DT_REG :
4597 S_ISDIR(st.st_mode) ? DT_DIR :
4598 S_ISLNK(st.st_mode) ? DT_LNK :
4599 S_ISFIFO(st.st_mode) ? DT_FIFO :
4600 S_ISSOCK(st.st_mode) ? DT_SOCK :
4601 S_ISCHR(st.st_mode) ? DT_CHR :
4602 S_ISBLK(st.st_mode) ? DT_BLK :
4603 DT_UNKNOWN;
4604
4605 return 0;
4606 }
4607
4608 int get_files_in_directory(const char *path, char ***list) {
4609 _cleanup_closedir_ DIR *d = NULL;
4610 size_t bufsize = 0, n = 0;
4611 _cleanup_strv_free_ char **l = NULL;
4612
4613 assert(path);
4614
4615 /* Returns all files in a directory in *list, and the number
4616 * of files as return value. If list is NULL returns only the
4617 * number. */
4618
4619 d = opendir(path);
4620 if (!d)
4621 return -errno;
4622
4623 for (;;) {
4624 struct dirent *de;
4625
4626 errno = 0;
4627 de = readdir(d);
4628 if (!de && errno != 0)
4629 return -errno;
4630 if (!de)
4631 break;
4632
4633 dirent_ensure_type(d, de);
4634
4635 if (!dirent_is_file(de))
4636 continue;
4637
4638 if (list) {
4639 /* one extra slot is needed for the terminating NULL */
4640 if (!GREEDY_REALLOC(l, bufsize, n + 2))
4641 return -ENOMEM;
4642
4643 l[n] = strdup(de->d_name);
4644 if (!l[n])
4645 return -ENOMEM;
4646
4647 l[++n] = NULL;
4648 } else
4649 n++;
4650 }
4651
4652 if (list) {
4653 *list = l;
4654 l = NULL; /* avoid freeing */
4655 }
4656
4657 return n;
4658 }
4659
4660 char *strjoin(const char *x, ...) {
4661 va_list ap;
4662 size_t l;
4663 char *r, *p;
4664
4665 va_start(ap, x);
4666
4667 if (x) {
4668 l = strlen(x);
4669
4670 for (;;) {
4671 const char *t;
4672 size_t n;
4673
4674 t = va_arg(ap, const char *);
4675 if (!t)
4676 break;
4677
4678 n = strlen(t);
4679 if (n > ((size_t) -1) - l) {
4680 va_end(ap);
4681 return NULL;
4682 }
4683
4684 l += n;
4685 }
4686 } else
4687 l = 0;
4688
4689 va_end(ap);
4690
4691 r = new(char, l+1);
4692 if (!r)
4693 return NULL;
4694
4695 if (x) {
4696 p = stpcpy(r, x);
4697
4698 va_start(ap, x);
4699
4700 for (;;) {
4701 const char *t;
4702
4703 t = va_arg(ap, const char *);
4704 if (!t)
4705 break;
4706
4707 p = stpcpy(p, t);
4708 }
4709
4710 va_end(ap);
4711 } else
4712 r[0] = 0;
4713
4714 return r;
4715 }
4716
4717 bool is_main_thread(void) {
4718 static thread_local int cached = 0;
4719
4720 if (_unlikely_(cached == 0))
4721 cached = getpid() == gettid() ? 1 : -1;
4722
4723 return cached > 0;
4724 }
4725
4726 int block_get_whole_disk(dev_t d, dev_t *ret) {
4727 char *p, *s;
4728 int r;
4729 unsigned n, m;
4730
4731 assert(ret);
4732
4733 /* If it has a queue this is good enough for us */
4734 if (asprintf(&p, "/sys/dev/block/%u:%u/queue", major(d), minor(d)) < 0)
4735 return -ENOMEM;
4736
4737 r = access(p, F_OK);
4738 free(p);
4739
4740 if (r >= 0) {
4741 *ret = d;
4742 return 0;
4743 }
4744
4745 /* If it is a partition find the originating device */
4746 if (asprintf(&p, "/sys/dev/block/%u:%u/partition", major(d), minor(d)) < 0)
4747 return -ENOMEM;
4748
4749 r = access(p, F_OK);
4750 free(p);
4751
4752 if (r < 0)
4753 return -ENOENT;
4754
4755 /* Get parent dev_t */
4756 if (asprintf(&p, "/sys/dev/block/%u:%u/../dev", major(d), minor(d)) < 0)
4757 return -ENOMEM;
4758
4759 r = read_one_line_file(p, &s);
4760 free(p);
4761
4762 if (r < 0)
4763 return r;
4764
4765 r = sscanf(s, "%u:%u", &m, &n);
4766 free(s);
4767
4768 if (r != 2)
4769 return -EINVAL;
4770
4771 /* Only return this if it is really good enough for us. */
4772 if (asprintf(&p, "/sys/dev/block/%u:%u/queue", m, n) < 0)
4773 return -ENOMEM;
4774
4775 r = access(p, F_OK);
4776 free(p);
4777
4778 if (r >= 0) {
4779 *ret = makedev(m, n);
4780 return 0;
4781 }
4782
4783 return -ENOENT;
4784 }
4785
4786 int file_is_priv_sticky(const char *p) {
4787 struct stat st;
4788
4789 assert(p);
4790
4791 if (lstat(p, &st) < 0)
4792 return -errno;
4793
4794 return
4795 (st.st_uid == 0 || st.st_uid == getuid()) &&
4796 (st.st_mode & S_ISVTX);
4797 }
4798
4799 static const char *const ioprio_class_table[] = {
4800 [IOPRIO_CLASS_NONE] = "none",
4801 [IOPRIO_CLASS_RT] = "realtime",
4802 [IOPRIO_CLASS_BE] = "best-effort",
4803 [IOPRIO_CLASS_IDLE] = "idle"
4804 };
4805
4806 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ioprio_class, int, INT_MAX);
4807
4808 static const char *const sigchld_code_table[] = {
4809 [CLD_EXITED] = "exited",
4810 [CLD_KILLED] = "killed",
4811 [CLD_DUMPED] = "dumped",
4812 [CLD_TRAPPED] = "trapped",
4813 [CLD_STOPPED] = "stopped",
4814 [CLD_CONTINUED] = "continued",
4815 };
4816
4817 DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
4818
4819 static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = {
4820 [LOG_FAC(LOG_KERN)] = "kern",
4821 [LOG_FAC(LOG_USER)] = "user",
4822 [LOG_FAC(LOG_MAIL)] = "mail",
4823 [LOG_FAC(LOG_DAEMON)] = "daemon",
4824 [LOG_FAC(LOG_AUTH)] = "auth",
4825 [LOG_FAC(LOG_SYSLOG)] = "syslog",
4826 [LOG_FAC(LOG_LPR)] = "lpr",
4827 [LOG_FAC(LOG_NEWS)] = "news",
4828 [LOG_FAC(LOG_UUCP)] = "uucp",
4829 [LOG_FAC(LOG_CRON)] = "cron",
4830 [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
4831 [LOG_FAC(LOG_FTP)] = "ftp",
4832 [LOG_FAC(LOG_LOCAL0)] = "local0",
4833 [LOG_FAC(LOG_LOCAL1)] = "local1",
4834 [LOG_FAC(LOG_LOCAL2)] = "local2",
4835 [LOG_FAC(LOG_LOCAL3)] = "local3",
4836 [LOG_FAC(LOG_LOCAL4)] = "local4",
4837 [LOG_FAC(LOG_LOCAL5)] = "local5",
4838 [LOG_FAC(LOG_LOCAL6)] = "local6",
4839 [LOG_FAC(LOG_LOCAL7)] = "local7"
4840 };
4841
4842 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_facility_unshifted, int, LOG_FAC(~0));
4843
4844 static const char *const log_level_table[] = {
4845 [LOG_EMERG] = "emerg",
4846 [LOG_ALERT] = "alert",
4847 [LOG_CRIT] = "crit",
4848 [LOG_ERR] = "err",
4849 [LOG_WARNING] = "warning",
4850 [LOG_NOTICE] = "notice",
4851 [LOG_INFO] = "info",
4852 [LOG_DEBUG] = "debug"
4853 };
4854
4855 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_level, int, LOG_DEBUG);
4856
4857 static const char* const sched_policy_table[] = {
4858 [SCHED_OTHER] = "other",
4859 [SCHED_BATCH] = "batch",
4860 [SCHED_IDLE] = "idle",
4861 [SCHED_FIFO] = "fifo",
4862 [SCHED_RR] = "rr"
4863 };
4864
4865 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(sched_policy, int, INT_MAX);
4866
4867 static const char* const rlimit_table[_RLIMIT_MAX] = {
4868 [RLIMIT_CPU] = "LimitCPU",
4869 [RLIMIT_FSIZE] = "LimitFSIZE",
4870 [RLIMIT_DATA] = "LimitDATA",
4871 [RLIMIT_STACK] = "LimitSTACK",
4872 [RLIMIT_CORE] = "LimitCORE",
4873 [RLIMIT_RSS] = "LimitRSS",
4874 [RLIMIT_NOFILE] = "LimitNOFILE",
4875 [RLIMIT_AS] = "LimitAS",
4876 [RLIMIT_NPROC] = "LimitNPROC",
4877 [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
4878 [RLIMIT_LOCKS] = "LimitLOCKS",
4879 [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
4880 [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
4881 [RLIMIT_NICE] = "LimitNICE",
4882 [RLIMIT_RTPRIO] = "LimitRTPRIO",
4883 [RLIMIT_RTTIME] = "LimitRTTIME"
4884 };
4885
4886 DEFINE_STRING_TABLE_LOOKUP(rlimit, int);
4887
4888 static const char* const ip_tos_table[] = {
4889 [IPTOS_LOWDELAY] = "low-delay",
4890 [IPTOS_THROUGHPUT] = "throughput",
4891 [IPTOS_RELIABILITY] = "reliability",
4892 [IPTOS_LOWCOST] = "low-cost",
4893 };
4894
4895 DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ip_tos, int, 0xff);
4896
4897 static const char *const __signal_table[] = {
4898 [SIGHUP] = "HUP",
4899 [SIGINT] = "INT",
4900 [SIGQUIT] = "QUIT",
4901 [SIGILL] = "ILL",
4902 [SIGTRAP] = "TRAP",
4903 [SIGABRT] = "ABRT",
4904 [SIGBUS] = "BUS",
4905 [SIGFPE] = "FPE",
4906 [SIGKILL] = "KILL",
4907 [SIGUSR1] = "USR1",
4908 [SIGSEGV] = "SEGV",
4909 [SIGUSR2] = "USR2",
4910 [SIGPIPE] = "PIPE",
4911 [SIGALRM] = "ALRM",
4912 [SIGTERM] = "TERM",
4913 #ifdef SIGSTKFLT
4914 [SIGSTKFLT] = "STKFLT", /* Linux on SPARC doesn't know SIGSTKFLT */
4915 #endif
4916 [SIGCHLD] = "CHLD",
4917 [SIGCONT] = "CONT",
4918 [SIGSTOP] = "STOP",
4919 [SIGTSTP] = "TSTP",
4920 [SIGTTIN] = "TTIN",
4921 [SIGTTOU] = "TTOU",
4922 [SIGURG] = "URG",
4923 [SIGXCPU] = "XCPU",
4924 [SIGXFSZ] = "XFSZ",
4925 [SIGVTALRM] = "VTALRM",
4926 [SIGPROF] = "PROF",
4927 [SIGWINCH] = "WINCH",
4928 [SIGIO] = "IO",
4929 [SIGPWR] = "PWR",
4930 [SIGSYS] = "SYS"
4931 };
4932
4933 DEFINE_PRIVATE_STRING_TABLE_LOOKUP(__signal, int);
4934
4935 const char *signal_to_string(int signo) {
4936 static thread_local char buf[sizeof("RTMIN+")-1 + DECIMAL_STR_MAX(int) + 1];
4937 const char *name;
4938
4939 name = __signal_to_string(signo);
4940 if (name)
4941 return name;
4942
4943 if (signo >= SIGRTMIN && signo <= SIGRTMAX)
4944 snprintf(buf, sizeof(buf), "RTMIN+%d", signo - SIGRTMIN);
4945 else
4946 snprintf(buf, sizeof(buf), "%d", signo);
4947
4948 return buf;
4949 }
4950
4951 int signal_from_string(const char *s) {
4952 int signo;
4953 int offset = 0;
4954 unsigned u;
4955
4956 signo = __signal_from_string(s);
4957 if (signo > 0)
4958 return signo;
4959
4960 if (startswith(s, "RTMIN+")) {
4961 s += 6;
4962 offset = SIGRTMIN;
4963 }
4964 if (safe_atou(s, &u) >= 0) {
4965 signo = (int) u + offset;
4966 if (signo > 0 && signo < _NSIG)
4967 return signo;
4968 }
4969 return -EINVAL;
4970 }
4971
4972 bool kexec_loaded(void) {
4973 bool loaded = false;
4974 char *s;
4975
4976 if (read_one_line_file("/sys/kernel/kexec_loaded", &s) >= 0) {
4977 if (s[0] == '1')
4978 loaded = true;
4979 free(s);
4980 }
4981 return loaded;
4982 }
4983
4984 int prot_from_flags(int flags) {
4985
4986 switch (flags & O_ACCMODE) {
4987
4988 case O_RDONLY:
4989 return PROT_READ;
4990
4991 case O_WRONLY:
4992 return PROT_WRITE;
4993
4994 case O_RDWR:
4995 return PROT_READ|PROT_WRITE;
4996
4997 default:
4998 return -EINVAL;
4999 }
5000 }
5001
5002 char *format_bytes(char *buf, size_t l, off_t t) {
5003 unsigned i;
5004
5005 static const struct {
5006 const char *suffix;
5007 off_t factor;
5008 } table[] = {
5009 { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
5010 { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
5011 { "T", 1024ULL*1024ULL*1024ULL*1024ULL },
5012 { "G", 1024ULL*1024ULL*1024ULL },
5013 { "M", 1024ULL*1024ULL },
5014 { "K", 1024ULL },
5015 };
5016
5017 for (i = 0; i < ELEMENTSOF(table); i++) {
5018
5019 if (t >= table[i].factor) {
5020 snprintf(buf, l,
5021 "%llu.%llu%s",
5022 (unsigned long long) (t / table[i].factor),
5023 (unsigned long long) (((t*10ULL) / table[i].factor) % 10ULL),
5024 table[i].suffix);
5025
5026 goto finish;
5027 }
5028 }
5029
5030 snprintf(buf, l, "%lluB", (unsigned long long) t);
5031
5032 finish:
5033 buf[l-1] = 0;
5034 return buf;
5035
5036 }
5037
5038 void* memdup(const void *p, size_t l) {
5039 void *r;
5040
5041 assert(p);
5042
5043 r = malloc(l);
5044 if (!r)
5045 return NULL;
5046
5047 memcpy(r, p, l);
5048 return r;
5049 }
5050
5051 int fd_inc_sndbuf(int fd, size_t n) {
5052 int r, value;
5053 socklen_t l = sizeof(value);
5054
5055 r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l);
5056 if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2)
5057 return 0;
5058
5059 /* If we have the privileges we will ignore the kernel limit. */
5060
5061 value = (int) n;
5062 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0)
5063 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
5064 return -errno;
5065
5066 return 1;
5067 }
5068
5069 int fd_inc_rcvbuf(int fd, size_t n) {
5070 int r, value;
5071 socklen_t l = sizeof(value);
5072
5073 r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l);
5074 if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2)
5075 return 0;
5076
5077 /* If we have the privileges we will ignore the kernel limit. */
5078
5079 value = (int) n;
5080 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0)
5081 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
5082 return -errno;
5083 return 1;
5084 }
5085
5086 int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...) {
5087 bool stdout_is_tty, stderr_is_tty;
5088 pid_t parent_pid, agent_pid;
5089 sigset_t ss, saved_ss;
5090 unsigned n, i;
5091 va_list ap;
5092 char **l;
5093
5094 assert(pid);
5095 assert(path);
5096
5097 /* Spawns a temporary TTY agent, making sure it goes away when
5098 * we go away */
5099
5100 parent_pid = getpid();
5101
5102 /* First we temporarily block all signals, so that the new
5103 * child has them blocked initially. This way, we can be sure
5104 * that SIGTERMs are not lost we might send to the agent. */
5105 assert_se(sigfillset(&ss) >= 0);
5106 assert_se(sigprocmask(SIG_SETMASK, &ss, &saved_ss) >= 0);
5107
5108 agent_pid = fork();
5109 if (agent_pid < 0) {
5110 assert_se(sigprocmask(SIG_SETMASK, &saved_ss, NULL) >= 0);
5111 return -errno;
5112 }
5113
5114 if (agent_pid != 0) {
5115 assert_se(sigprocmask(SIG_SETMASK, &saved_ss, NULL) >= 0);
5116 *pid = agent_pid;
5117 return 0;
5118 }
5119
5120 /* In the child:
5121 *
5122 * Make sure the agent goes away when the parent dies */
5123 if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
5124 _exit(EXIT_FAILURE);
5125
5126 /* Make sure we actually can kill the agent, if we need to, in
5127 * case somebody invoked us from a shell script that trapped
5128 * SIGTERM or so... */
5129 reset_all_signal_handlers();
5130 reset_signal_mask();
5131
5132 /* Check whether our parent died before we were able
5133 * to set the death signal and unblock the signals */
5134 if (getppid() != parent_pid)
5135 _exit(EXIT_SUCCESS);
5136
5137 /* Don't leak fds to the agent */
5138 close_all_fds(except, n_except);
5139
5140 stdout_is_tty = isatty(STDOUT_FILENO);
5141 stderr_is_tty = isatty(STDERR_FILENO);
5142
5143 if (!stdout_is_tty || !stderr_is_tty) {
5144 int fd;
5145
5146 /* Detach from stdout/stderr. and reopen
5147 * /dev/tty for them. This is important to
5148 * ensure that when systemctl is started via
5149 * popen() or a similar call that expects to
5150 * read EOF we actually do generate EOF and
5151 * not delay this indefinitely by because we
5152 * keep an unused copy of stdin around. */
5153 fd = open("/dev/tty", O_WRONLY);
5154 if (fd < 0) {
5155 log_error("Failed to open /dev/tty: %m");
5156 _exit(EXIT_FAILURE);
5157 }
5158
5159 if (!stdout_is_tty)
5160 dup2(fd, STDOUT_FILENO);
5161
5162 if (!stderr_is_tty)
5163 dup2(fd, STDERR_FILENO);
5164
5165 if (fd > 2)
5166 close(fd);
5167 }
5168
5169 /* Count arguments */
5170 va_start(ap, path);
5171 for (n = 0; va_arg(ap, char*); n++)
5172 ;
5173 va_end(ap);
5174
5175 /* Allocate strv */
5176 l = alloca(sizeof(char *) * (n + 1));
5177
5178 /* Fill in arguments */
5179 va_start(ap, path);
5180 for (i = 0; i <= n; i++)
5181 l[i] = va_arg(ap, char*);
5182 va_end(ap);
5183
5184 execv(path, l);
5185 _exit(EXIT_FAILURE);
5186 }
5187
5188 int setrlimit_closest(int resource, const struct rlimit *rlim) {
5189 struct rlimit highest, fixed;
5190
5191 assert(rlim);
5192
5193 if (setrlimit(resource, rlim) >= 0)
5194 return 0;
5195
5196 if (errno != EPERM)
5197 return -errno;
5198
5199 /* So we failed to set the desired setrlimit, then let's try
5200 * to get as close as we can */
5201 assert_se(getrlimit(resource, &highest) == 0);
5202
5203 fixed.rlim_cur = MIN(rlim->rlim_cur, highest.rlim_max);
5204 fixed.rlim_max = MIN(rlim->rlim_max, highest.rlim_max);
5205
5206 if (setrlimit(resource, &fixed) < 0)
5207 return -errno;
5208
5209 return 0;
5210 }
5211
5212 int getenv_for_pid(pid_t pid, const char *field, char **_value) {
5213 _cleanup_fclose_ FILE *f = NULL;
5214 char *value = NULL;
5215 int r;
5216 bool done = false;
5217 size_t l;
5218 const char *path;
5219
5220 assert(pid >= 0);
5221 assert(field);
5222 assert(_value);
5223
5224 path = procfs_file_alloca(pid, "environ");
5225
5226 f = fopen(path, "re");
5227 if (!f)
5228 return -errno;
5229
5230 l = strlen(field);
5231 r = 0;
5232
5233 do {
5234 char line[LINE_MAX];
5235 unsigned i;
5236
5237 for (i = 0; i < sizeof(line)-1; i++) {
5238 int c;
5239
5240 c = getc(f);
5241 if (_unlikely_(c == EOF)) {
5242 done = true;
5243 break;
5244 } else if (c == 0)
5245 break;
5246
5247 line[i] = c;
5248 }
5249 line[i] = 0;
5250
5251 if (memcmp(line, field, l) == 0 && line[l] == '=') {
5252 value = strdup(line + l + 1);
5253 if (!value)
5254 return -ENOMEM;
5255
5256 r = 1;
5257 break;
5258 }
5259
5260 } while (!done);
5261
5262 *_value = value;
5263 return r;
5264 }
5265
5266 bool is_valid_documentation_url(const char *url) {
5267 assert(url);
5268
5269 if (startswith(url, "http://") && url[7])
5270 return true;
5271
5272 if (startswith(url, "https://") && url[8])
5273 return true;
5274
5275 if (startswith(url, "file:") && url[5])
5276 return true;
5277
5278 if (startswith(url, "info:") && url[5])
5279 return true;
5280
5281 if (startswith(url, "man:") && url[4])
5282 return true;
5283
5284 return false;
5285 }
5286
5287 bool in_initrd(void) {
5288 static int saved = -1;
5289 struct statfs s;
5290
5291 if (saved >= 0)
5292 return saved;
5293
5294 /* We make two checks here:
5295 *
5296 * 1. the flag file /etc/initrd-release must exist
5297 * 2. the root file system must be a memory file system
5298 *
5299 * The second check is extra paranoia, since misdetecting an
5300 * initrd can have bad bad consequences due the initrd
5301 * emptying when transititioning to the main systemd.
5302 */
5303
5304 saved = access("/etc/initrd-release", F_OK) >= 0 &&
5305 statfs("/", &s) >= 0 &&
5306 is_temporary_fs(&s);
5307
5308 return saved;
5309 }
5310
5311 void warn_melody(void) {
5312 _cleanup_close_ int fd = -1;
5313
5314 fd = open("/dev/console", O_WRONLY|O_CLOEXEC|O_NOCTTY);
5315 if (fd < 0)
5316 return;
5317
5318 /* Yeah, this is synchronous. Kinda sucks. But well... */
5319
5320 ioctl(fd, KIOCSOUND, (int)(1193180/440));
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, (int)(1193180/220));
5327 usleep(125*USEC_PER_MSEC);
5328
5329 ioctl(fd, KIOCSOUND, 0);
5330 }
5331
5332 int make_console_stdio(void) {
5333 int fd, r;
5334
5335 /* Make /dev/console the controlling terminal and stdin/stdout/stderr */
5336
5337 fd = acquire_terminal("/dev/console", false, true, true, USEC_INFINITY);
5338 if (fd < 0) {
5339 log_error("Failed to acquire terminal: %s", strerror(-fd));
5340 return fd;
5341 }
5342
5343 r = make_stdio(fd);
5344 if (r < 0) {
5345 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
5346 return r;
5347 }
5348
5349 return 0;
5350 }
5351
5352 int get_home_dir(char **_h) {
5353 struct passwd *p;
5354 const char *e;
5355 char *h;
5356 uid_t u;
5357
5358 assert(_h);
5359
5360 /* Take the user specified one */
5361 e = secure_getenv("HOME");
5362 if (e && path_is_absolute(e)) {
5363 h = strdup(e);
5364 if (!h)
5365 return -ENOMEM;
5366
5367 *_h = h;
5368 return 0;
5369 }
5370
5371 /* Hardcode home directory for root to avoid NSS */
5372 u = getuid();
5373 if (u == 0) {
5374 h = strdup("/root");
5375 if (!h)
5376 return -ENOMEM;
5377
5378 *_h = h;
5379 return 0;
5380 }
5381
5382 /* Check the database... */
5383 errno = 0;
5384 p = getpwuid(u);
5385 if (!p)
5386 return errno > 0 ? -errno : -ESRCH;
5387
5388 if (!path_is_absolute(p->pw_dir))
5389 return -EINVAL;
5390
5391 h = strdup(p->pw_dir);
5392 if (!h)
5393 return -ENOMEM;
5394
5395 *_h = h;
5396 return 0;
5397 }
5398
5399 int get_shell(char **_s) {
5400 struct passwd *p;
5401 const char *e;
5402 char *s;
5403 uid_t u;
5404
5405 assert(_s);
5406
5407 /* Take the user specified one */
5408 e = getenv("SHELL");
5409 if (e) {
5410 s = strdup(e);
5411 if (!s)
5412 return -ENOMEM;
5413
5414 *_s = s;
5415 return 0;
5416 }
5417
5418 /* Hardcode home directory for root to avoid NSS */
5419 u = getuid();
5420 if (u == 0) {
5421 s = strdup("/bin/sh");
5422 if (!s)
5423 return -ENOMEM;
5424
5425 *_s = s;
5426 return 0;
5427 }
5428
5429 /* Check the database... */
5430 errno = 0;
5431 p = getpwuid(u);
5432 if (!p)
5433 return errno > 0 ? -errno : -ESRCH;
5434
5435 if (!path_is_absolute(p->pw_shell))
5436 return -EINVAL;
5437
5438 s = strdup(p->pw_shell);
5439 if (!s)
5440 return -ENOMEM;
5441
5442 *_s = s;
5443 return 0;
5444 }
5445
5446 bool filename_is_safe(const char *p) {
5447
5448 if (isempty(p))
5449 return false;
5450
5451 if (strchr(p, '/'))
5452 return false;
5453
5454 if (streq(p, "."))
5455 return false;
5456
5457 if (streq(p, ".."))
5458 return false;
5459
5460 if (strlen(p) > FILENAME_MAX)
5461 return false;
5462
5463 return true;
5464 }
5465
5466 bool string_is_safe(const char *p) {
5467 const char *t;
5468
5469 if (!p)
5470 return false;
5471
5472 for (t = p; *t; t++) {
5473 if (*t > 0 && *t < ' ')
5474 return false;
5475
5476 if (strchr("\\\"\'\0x7f", *t))
5477 return false;
5478 }
5479
5480 return true;
5481 }
5482
5483 /**
5484 * Check if a string contains control characters. If 'ok' is non-NULL
5485 * it may be a string containing additional CCs to be considered OK.
5486 */
5487 bool string_has_cc(const char *p, const char *ok) {
5488 const char *t;
5489
5490 assert(p);
5491
5492 for (t = p; *t; t++) {
5493 if (ok && strchr(ok, *t))
5494 continue;
5495
5496 if (*t > 0 && *t < ' ')
5497 return true;
5498
5499 if (*t == 127)
5500 return true;
5501 }
5502
5503 return false;
5504 }
5505
5506 bool path_is_safe(const char *p) {
5507
5508 if (isempty(p))
5509 return false;
5510
5511 if (streq(p, "..") || startswith(p, "../") || endswith(p, "/..") || strstr(p, "/../"))
5512 return false;
5513
5514 if (strlen(p) > PATH_MAX)
5515 return false;
5516
5517 /* The following two checks are not really dangerous, but hey, they still are confusing */
5518 if (streq(p, ".") || startswith(p, "./") || endswith(p, "/.") || strstr(p, "/./"))
5519 return false;
5520
5521 if (strstr(p, "//"))
5522 return false;
5523
5524 return true;
5525 }
5526
5527 /* hey glibc, APIs with callbacks without a user pointer are so useless */
5528 void *xbsearch_r(const void *key, const void *base, size_t nmemb, size_t size,
5529 int (*compar) (const void *, const void *, void *), void *arg) {
5530 size_t l, u, idx;
5531 const void *p;
5532 int comparison;
5533
5534 l = 0;
5535 u = nmemb;
5536 while (l < u) {
5537 idx = (l + u) / 2;
5538 p = (void *)(((const char *) base) + (idx * size));
5539 comparison = compar(key, p, arg);
5540 if (comparison < 0)
5541 u = idx;
5542 else if (comparison > 0)
5543 l = idx + 1;
5544 else
5545 return (void *)p;
5546 }
5547 return NULL;
5548 }
5549
5550 bool is_locale_utf8(void) {
5551 const char *set;
5552 static int cached_answer = -1;
5553
5554 if (cached_answer >= 0)
5555 goto out;
5556
5557 if (!setlocale(LC_ALL, "")) {
5558 cached_answer = true;
5559 goto out;
5560 }
5561
5562 set = nl_langinfo(CODESET);
5563 if (!set) {
5564 cached_answer = true;
5565 goto out;
5566 }
5567
5568 if (streq(set, "UTF-8")) {
5569 cached_answer = true;
5570 goto out;
5571 }
5572
5573 /* For LC_CTYPE=="C" return true, because CTYPE is effectly
5574 * unset and everything can do to UTF-8 nowadays. */
5575 set = setlocale(LC_CTYPE, NULL);
5576 if (!set) {
5577 cached_answer = true;
5578 goto out;
5579 }
5580
5581 /* Check result, but ignore the result if C was set
5582 * explicitly. */
5583 cached_answer =
5584 streq(set, "C") &&
5585 !getenv("LC_ALL") &&
5586 !getenv("LC_CTYPE") &&
5587 !getenv("LANG");
5588
5589 out:
5590 return (bool) cached_answer;
5591 }
5592
5593 const char *draw_special_char(DrawSpecialChar ch) {
5594 static const char *draw_table[2][_DRAW_SPECIAL_CHAR_MAX] = {
5595
5596 /* UTF-8 */ {
5597 [DRAW_TREE_VERTICAL] = "\342\224\202 ", /* │ */
5598 [DRAW_TREE_BRANCH] = "\342\224\234\342\224\200", /* ├─ */
5599 [DRAW_TREE_RIGHT] = "\342\224\224\342\224\200", /* └─ */
5600 [DRAW_TREE_SPACE] = " ", /* */
5601 [DRAW_TRIANGULAR_BULLET] = "\342\200\243", /* ‣ */
5602 [DRAW_BLACK_CIRCLE] = "\342\227\217", /* ● */
5603 [DRAW_ARROW] = "\342\206\222", /* → */
5604 [DRAW_DASH] = "\342\200\223", /* – */
5605 },
5606
5607 /* ASCII fallback */ {
5608 [DRAW_TREE_VERTICAL] = "| ",
5609 [DRAW_TREE_BRANCH] = "|-",
5610 [DRAW_TREE_RIGHT] = "`-",
5611 [DRAW_TREE_SPACE] = " ",
5612 [DRAW_TRIANGULAR_BULLET] = ">",
5613 [DRAW_BLACK_CIRCLE] = "*",
5614 [DRAW_ARROW] = "->",
5615 [DRAW_DASH] = "-",
5616 }
5617 };
5618
5619 return draw_table[!is_locale_utf8()][ch];
5620 }
5621
5622 char *strreplace(const char *text, const char *old_string, const char *new_string) {
5623 const char *f;
5624 char *t, *r;
5625 size_t l, old_len, new_len;
5626
5627 assert(text);
5628 assert(old_string);
5629 assert(new_string);
5630
5631 old_len = strlen(old_string);
5632 new_len = strlen(new_string);
5633
5634 l = strlen(text);
5635 r = new(char, l+1);
5636 if (!r)
5637 return NULL;
5638
5639 f = text;
5640 t = r;
5641 while (*f) {
5642 char *a;
5643 size_t d, nl;
5644
5645 if (!startswith(f, old_string)) {
5646 *(t++) = *(f++);
5647 continue;
5648 }
5649
5650 d = t - r;
5651 nl = l - old_len + new_len;
5652 a = realloc(r, nl + 1);
5653 if (!a)
5654 goto oom;
5655
5656 l = nl;
5657 r = a;
5658 t = r + d;
5659
5660 t = stpcpy(t, new_string);
5661 f += old_len;
5662 }
5663
5664 *t = 0;
5665 return r;
5666
5667 oom:
5668 free(r);
5669 return NULL;
5670 }
5671
5672 char *strip_tab_ansi(char **ibuf, size_t *_isz) {
5673 const char *i, *begin = NULL;
5674 enum {
5675 STATE_OTHER,
5676 STATE_ESCAPE,
5677 STATE_BRACKET
5678 } state = STATE_OTHER;
5679 char *obuf = NULL;
5680 size_t osz = 0, isz;
5681 FILE *f;
5682
5683 assert(ibuf);
5684 assert(*ibuf);
5685
5686 /* Strips ANSI color and replaces TABs by 8 spaces */
5687
5688 isz = _isz ? *_isz : strlen(*ibuf);
5689
5690 f = open_memstream(&obuf, &osz);
5691 if (!f)
5692 return NULL;
5693
5694 for (i = *ibuf; i < *ibuf + isz + 1; i++) {
5695
5696 switch (state) {
5697
5698 case STATE_OTHER:
5699 if (i >= *ibuf + isz) /* EOT */
5700 break;
5701 else if (*i == '\x1B')
5702 state = STATE_ESCAPE;
5703 else if (*i == '\t')
5704 fputs(" ", f);
5705 else
5706 fputc(*i, f);
5707 break;
5708
5709 case STATE_ESCAPE:
5710 if (i >= *ibuf + isz) { /* EOT */
5711 fputc('\x1B', f);
5712 break;
5713 } else if (*i == '[') {
5714 state = STATE_BRACKET;
5715 begin = i + 1;
5716 } else {
5717 fputc('\x1B', f);
5718 fputc(*i, f);
5719 state = STATE_OTHER;
5720 }
5721
5722 break;
5723
5724 case STATE_BRACKET:
5725
5726 if (i >= *ibuf + isz || /* EOT */
5727 (!(*i >= '0' && *i <= '9') && *i != ';' && *i != 'm')) {
5728 fputc('\x1B', f);
5729 fputc('[', f);
5730 state = STATE_OTHER;
5731 i = begin-1;
5732 } else if (*i == 'm')
5733 state = STATE_OTHER;
5734 break;
5735 }
5736 }
5737
5738 if (ferror(f)) {
5739 fclose(f);
5740 free(obuf);
5741 return NULL;
5742 }
5743
5744 fclose(f);
5745
5746 free(*ibuf);
5747 *ibuf = obuf;
5748
5749 if (_isz)
5750 *_isz = osz;
5751
5752 return obuf;
5753 }
5754
5755 int on_ac_power(void) {
5756 bool found_offline = false, found_online = false;
5757 _cleanup_closedir_ DIR *d = NULL;
5758
5759 d = opendir("/sys/class/power_supply");
5760 if (!d)
5761 return -errno;
5762
5763 for (;;) {
5764 struct dirent *de;
5765 _cleanup_close_ int fd = -1, device = -1;
5766 char contents[6];
5767 ssize_t n;
5768
5769 errno = 0;
5770 de = readdir(d);
5771 if (!de && errno != 0)
5772 return -errno;
5773
5774 if (!de)
5775 break;
5776
5777 if (ignore_file(de->d_name))
5778 continue;
5779
5780 device = openat(dirfd(d), de->d_name, O_DIRECTORY|O_RDONLY|O_CLOEXEC|O_NOCTTY);
5781 if (device < 0) {
5782 if (errno == ENOENT || errno == ENOTDIR)
5783 continue;
5784
5785 return -errno;
5786 }
5787
5788 fd = openat(device, "type", O_RDONLY|O_CLOEXEC|O_NOCTTY);
5789 if (fd < 0) {
5790 if (errno == ENOENT)
5791 continue;
5792
5793 return -errno;
5794 }
5795
5796 n = read(fd, contents, sizeof(contents));
5797 if (n < 0)
5798 return -errno;
5799
5800 if (n != 6 || memcmp(contents, "Mains\n", 6))
5801 continue;
5802
5803 safe_close(fd);
5804 fd = openat(device, "online", O_RDONLY|O_CLOEXEC|O_NOCTTY);
5805 if (fd < 0) {
5806 if (errno == ENOENT)
5807 continue;
5808
5809 return -errno;
5810 }
5811
5812 n = read(fd, contents, sizeof(contents));
5813 if (n < 0)
5814 return -errno;
5815
5816 if (n != 2 || contents[1] != '\n')
5817 return -EIO;
5818
5819 if (contents[0] == '1') {
5820 found_online = true;
5821 break;
5822 } else if (contents[0] == '0')
5823 found_offline = true;
5824 else
5825 return -EIO;
5826 }
5827
5828 return found_online || !found_offline;
5829 }
5830
5831 static int search_and_fopen_internal(const char *path, const char *mode, const char *root, char **search, FILE **_f) {
5832 char **i;
5833
5834 assert(path);
5835 assert(mode);
5836 assert(_f);
5837
5838 if (!path_strv_resolve_uniq(search, root))
5839 return -ENOMEM;
5840
5841 STRV_FOREACH(i, search) {
5842 _cleanup_free_ char *p = NULL;
5843 FILE *f;
5844
5845 if (root)
5846 p = strjoin(root, *i, "/", path, NULL);
5847 else
5848 p = strjoin(*i, "/", path, NULL);
5849 if (!p)
5850 return -ENOMEM;
5851
5852 f = fopen(p, mode);
5853 if (f) {
5854 *_f = f;
5855 return 0;
5856 }
5857
5858 if (errno != ENOENT)
5859 return -errno;
5860 }
5861
5862 return -ENOENT;
5863 }
5864
5865 int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f) {
5866 _cleanup_strv_free_ char **copy = NULL;
5867
5868 assert(path);
5869 assert(mode);
5870 assert(_f);
5871
5872 if (path_is_absolute(path)) {
5873 FILE *f;
5874
5875 f = fopen(path, mode);
5876 if (f) {
5877 *_f = f;
5878 return 0;
5879 }
5880
5881 return -errno;
5882 }
5883
5884 copy = strv_copy((char**) search);
5885 if (!copy)
5886 return -ENOMEM;
5887
5888 return search_and_fopen_internal(path, mode, root, copy, _f);
5889 }
5890
5891 int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f) {
5892 _cleanup_strv_free_ char **s = NULL;
5893
5894 if (path_is_absolute(path)) {
5895 FILE *f;
5896
5897 f = fopen(path, mode);
5898 if (f) {
5899 *_f = f;
5900 return 0;
5901 }
5902
5903 return -errno;
5904 }
5905
5906 s = strv_split_nulstr(search);
5907 if (!s)
5908 return -ENOMEM;
5909
5910 return search_and_fopen_internal(path, mode, root, s, _f);
5911 }
5912
5913 char *strextend(char **x, ...) {
5914 va_list ap;
5915 size_t f, l;
5916 char *r, *p;
5917
5918 assert(x);
5919
5920 l = f = *x ? strlen(*x) : 0;
5921
5922 va_start(ap, x);
5923 for (;;) {
5924 const char *t;
5925 size_t n;
5926
5927 t = va_arg(ap, const char *);
5928 if (!t)
5929 break;
5930
5931 n = strlen(t);
5932 if (n > ((size_t) -1) - l) {
5933 va_end(ap);
5934 return NULL;
5935 }
5936
5937 l += n;
5938 }
5939 va_end(ap);
5940
5941 r = realloc(*x, l+1);
5942 if (!r)
5943 return NULL;
5944
5945 p = r + f;
5946
5947 va_start(ap, x);
5948 for (;;) {
5949 const char *t;
5950
5951 t = va_arg(ap, const char *);
5952 if (!t)
5953 break;
5954
5955 p = stpcpy(p, t);
5956 }
5957 va_end(ap);
5958
5959 *p = 0;
5960 *x = r;
5961
5962 return r + l;
5963 }
5964
5965 char *strrep(const char *s, unsigned n) {
5966 size_t l;
5967 char *r, *p;
5968 unsigned i;
5969
5970 assert(s);
5971
5972 l = strlen(s);
5973 p = r = malloc(l * n + 1);
5974 if (!r)
5975 return NULL;
5976
5977 for (i = 0; i < n; i++)
5978 p = stpcpy(p, s);
5979
5980 *p = 0;
5981 return r;
5982 }
5983
5984 void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size) {
5985 size_t a, newalloc;
5986 void *q;
5987
5988 assert(p);
5989 assert(allocated);
5990
5991 if (*allocated >= need)
5992 return *p;
5993
5994 newalloc = MAX(need * 2, 64u / size);
5995 a = newalloc * size;
5996
5997 /* check for overflows */
5998 if (a < size * need)
5999 return NULL;
6000
6001 q = realloc(*p, a);
6002 if (!q)
6003 return NULL;
6004
6005 *p = q;
6006 *allocated = newalloc;
6007 return q;
6008 }
6009
6010 void* greedy_realloc0(void **p, size_t *allocated, size_t need, size_t size) {
6011 size_t prev;
6012 uint8_t *q;
6013
6014 assert(p);
6015 assert(allocated);
6016
6017 prev = *allocated;
6018
6019 q = greedy_realloc(p, allocated, need, size);
6020 if (!q)
6021 return NULL;
6022
6023 if (*allocated > prev)
6024 memzero(q + prev * size, (*allocated - prev) * size);
6025
6026 return q;
6027 }
6028
6029 bool id128_is_valid(const char *s) {
6030 size_t i, l;
6031
6032 l = strlen(s);
6033 if (l == 32) {
6034
6035 /* Simple formatted 128bit hex string */
6036
6037 for (i = 0; i < l; i++) {
6038 char c = s[i];
6039
6040 if (!(c >= '0' && c <= '9') &&
6041 !(c >= 'a' && c <= 'z') &&
6042 !(c >= 'A' && c <= 'Z'))
6043 return false;
6044 }
6045
6046 } else if (l == 36) {
6047
6048 /* Formatted UUID */
6049
6050 for (i = 0; i < l; i++) {
6051 char c = s[i];
6052
6053 if ((i == 8 || i == 13 || i == 18 || i == 23)) {
6054 if (c != '-')
6055 return false;
6056 } else {
6057 if (!(c >= '0' && c <= '9') &&
6058 !(c >= 'a' && c <= 'z') &&
6059 !(c >= 'A' && c <= 'Z'))
6060 return false;
6061 }
6062 }
6063
6064 } else
6065 return false;
6066
6067 return true;
6068 }
6069
6070 int split_pair(const char *s, const char *sep, char **l, char **r) {
6071 char *x, *a, *b;
6072
6073 assert(s);
6074 assert(sep);
6075 assert(l);
6076 assert(r);
6077
6078 if (isempty(sep))
6079 return -EINVAL;
6080
6081 x = strstr(s, sep);
6082 if (!x)
6083 return -EINVAL;
6084
6085 a = strndup(s, x - s);
6086 if (!a)
6087 return -ENOMEM;
6088
6089 b = strdup(x + strlen(sep));
6090 if (!b) {
6091 free(a);
6092 return -ENOMEM;
6093 }
6094
6095 *l = a;
6096 *r = b;
6097
6098 return 0;
6099 }
6100
6101 int shall_restore_state(void) {
6102 _cleanup_free_ char *line = NULL;
6103 const char *word, *state;
6104 size_t l;
6105 int r;
6106
6107 r = proc_cmdline(&line);
6108 if (r < 0)
6109 return r;
6110 if (r == 0) /* Container ... */
6111 return 1;
6112
6113 r = 1;
6114
6115 FOREACH_WORD_QUOTED(word, l, line, state) {
6116 const char *e;
6117 char n[l+1];
6118 int k;
6119
6120 memcpy(n, word, l);
6121 n[l] = 0;
6122
6123 e = startswith(n, "systemd.restore_state=");
6124 if (!e)
6125 continue;
6126
6127 k = parse_boolean(e);
6128 if (k >= 0)
6129 r = k;
6130 }
6131
6132 return r;
6133 }
6134
6135 int proc_cmdline(char **ret) {
6136 int r;
6137
6138 if (detect_container(NULL) > 0) {
6139 char *buf = NULL, *p;
6140 size_t sz = 0;
6141
6142 r = read_full_file("/proc/1/cmdline", &buf, &sz);
6143 if (r < 0)
6144 return r;
6145
6146 for (p = buf; p + 1 < buf + sz; p++)
6147 if (*p == 0)
6148 *p = ' ';
6149
6150 *p = 0;
6151 *ret = buf;
6152 return 1;
6153 }
6154
6155 r = read_one_line_file("/proc/cmdline", ret);
6156 if (r < 0)
6157 return r;
6158
6159 return 1;
6160 }
6161
6162 int parse_proc_cmdline(int (*parse_item)(const char *key, const char *value)) {
6163 _cleanup_free_ char *line = NULL;
6164 const char *w, *state;
6165 size_t l;
6166 int r;
6167
6168 assert(parse_item);
6169
6170 r = proc_cmdline(&line);
6171 if (r < 0)
6172 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
6173 if (r <= 0)
6174 return 0;
6175
6176 FOREACH_WORD_QUOTED(w, l, line, state) {
6177 char word[l+1], *value;
6178
6179 memcpy(word, w, l);
6180 word[l] = 0;
6181
6182 /* Filter out arguments that are intended only for the
6183 * initrd */
6184 if (!in_initrd() && startswith(word, "rd."))
6185 continue;
6186
6187 value = strchr(word, '=');
6188 if (value)
6189 *(value++) = 0;
6190
6191 r = parse_item(word, value);
6192 if (r < 0)
6193 return r;
6194 }
6195
6196 return 0;
6197 }
6198
6199 int container_get_leader(const char *machine, pid_t *pid) {
6200 _cleanup_free_ char *s = NULL, *class = NULL;
6201 const char *p;
6202 pid_t leader;
6203 int r;
6204
6205 assert(machine);
6206 assert(pid);
6207
6208 p = strappenda("/run/systemd/machines/", machine);
6209 r = parse_env_file(p, NEWLINE, "LEADER", &s, "CLASS", &class, NULL);
6210 if (r == -ENOENT)
6211 return -EHOSTDOWN;
6212 if (r < 0)
6213 return r;
6214 if (!s)
6215 return -EIO;
6216
6217 if (!streq_ptr(class, "container"))
6218 return -EIO;
6219
6220 r = parse_pid(s, &leader);
6221 if (r < 0)
6222 return r;
6223 if (leader <= 1)
6224 return -EIO;
6225
6226 *pid = leader;
6227 return 0;
6228 }
6229
6230 int namespace_open(pid_t pid, int *pidns_fd, int *mntns_fd, int *netns_fd, int *root_fd) {
6231 _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, netnsfd = -1;
6232 int rfd = -1;
6233
6234 assert(pid >= 0);
6235
6236 if (mntns_fd) {
6237 const char *mntns;
6238
6239 mntns = procfs_file_alloca(pid, "ns/mnt");
6240 mntnsfd = open(mntns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
6241 if (mntnsfd < 0)
6242 return -errno;
6243 }
6244
6245 if (pidns_fd) {
6246 const char *pidns;
6247
6248 pidns = procfs_file_alloca(pid, "ns/pid");
6249 pidnsfd = open(pidns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
6250 if (pidnsfd < 0)
6251 return -errno;
6252 }
6253
6254 if (netns_fd) {
6255 const char *netns;
6256
6257 netns = procfs_file_alloca(pid, "ns/net");
6258 netnsfd = open(netns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
6259 if (netnsfd < 0)
6260 return -errno;
6261 }
6262
6263 if (root_fd) {
6264 const char *root;
6265
6266 root = procfs_file_alloca(pid, "root");
6267 rfd = open(root, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
6268 if (rfd < 0)
6269 return -errno;
6270 }
6271
6272 if (pidns_fd)
6273 *pidns_fd = pidnsfd;
6274
6275 if (mntns_fd)
6276 *mntns_fd = mntnsfd;
6277
6278 if (netns_fd)
6279 *netns_fd = netnsfd;
6280
6281 if (root_fd)
6282 *root_fd = rfd;
6283
6284 pidnsfd = mntnsfd = netnsfd = -1;
6285
6286 return 0;
6287 }
6288
6289 int namespace_enter(int pidns_fd, int mntns_fd, int netns_fd, int root_fd) {
6290
6291 if (pidns_fd >= 0)
6292 if (setns(pidns_fd, CLONE_NEWPID) < 0)
6293 return -errno;
6294
6295 if (mntns_fd >= 0)
6296 if (setns(mntns_fd, CLONE_NEWNS) < 0)
6297 return -errno;
6298
6299 if (netns_fd >= 0)
6300 if (setns(netns_fd, CLONE_NEWNET) < 0)
6301 return -errno;
6302
6303 if (root_fd >= 0) {
6304 if (fchdir(root_fd) < 0)
6305 return -errno;
6306
6307 if (chroot(".") < 0)
6308 return -errno;
6309 }
6310
6311 if (setresgid(0, 0, 0) < 0)
6312 return -errno;
6313
6314 if (setgroups(0, NULL) < 0)
6315 return -errno;
6316
6317 if (setresuid(0, 0, 0) < 0)
6318 return -errno;
6319
6320 return 0;
6321 }
6322
6323 bool pid_is_unwaited(pid_t pid) {
6324 /* Checks whether a PID is still valid at all, including a zombie */
6325
6326 if (pid <= 0)
6327 return false;
6328
6329 if (kill(pid, 0) >= 0)
6330 return true;
6331
6332 return errno != ESRCH;
6333 }
6334
6335 bool pid_is_alive(pid_t pid) {
6336 int r;
6337
6338 /* Checks whether a PID is still valid and not a zombie */
6339
6340 if (pid <= 0)
6341 return false;
6342
6343 r = get_process_state(pid);
6344 if (r == -ENOENT || r == 'Z')
6345 return false;
6346
6347 return true;
6348 }
6349
6350 int getpeercred(int fd, struct ucred *ucred) {
6351 socklen_t n = sizeof(struct ucred);
6352 struct ucred u;
6353 int r;
6354
6355 assert(fd >= 0);
6356 assert(ucred);
6357
6358 r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &u, &n);
6359 if (r < 0)
6360 return -errno;
6361
6362 if (n != sizeof(struct ucred))
6363 return -EIO;
6364
6365 /* Check if the data is actually useful and not suppressed due
6366 * to namespacing issues */
6367 if (u.pid <= 0)
6368 return -ENODATA;
6369
6370 *ucred = u;
6371 return 0;
6372 }
6373
6374 int getpeersec(int fd, char **ret) {
6375 socklen_t n = 64;
6376 char *s;
6377 int r;
6378
6379 assert(fd >= 0);
6380 assert(ret);
6381
6382 s = new0(char, n);
6383 if (!s)
6384 return -ENOMEM;
6385
6386 r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n);
6387 if (r < 0) {
6388 free(s);
6389
6390 if (errno != ERANGE)
6391 return -errno;
6392
6393 s = new0(char, n);
6394 if (!s)
6395 return -ENOMEM;
6396
6397 r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n);
6398 if (r < 0) {
6399 free(s);
6400 return -errno;
6401 }
6402 }
6403
6404 if (isempty(s)) {
6405 free(s);
6406 return -ENOTSUP;
6407 }
6408
6409 *ret = s;
6410 return 0;
6411 }
6412
6413 /* This is much like like mkostemp() but is subject to umask(). */
6414 int mkostemp_safe(char *pattern, int flags) {
6415 _cleanup_umask_ mode_t u;
6416 int fd;
6417
6418 assert(pattern);
6419
6420 u = umask(077);
6421
6422 fd = mkostemp(pattern, flags);
6423 if (fd < 0)
6424 return -errno;
6425
6426 return fd;
6427 }
6428
6429 int open_tmpfile(const char *path, int flags) {
6430 char *p;
6431 int fd;
6432
6433 assert(path);
6434
6435 #ifdef O_TMPFILE
6436 /* Try O_TMPFILE first, if it is supported */
6437 fd = open(path, flags|O_TMPFILE, S_IRUSR|S_IWUSR);
6438 if (fd >= 0)
6439 return fd;
6440 #endif
6441
6442 /* Fall back to unguessable name + unlinking */
6443 p = strappenda(path, "/systemd-tmp-XXXXXX");
6444
6445 fd = mkostemp_safe(p, flags);
6446 if (fd < 0)
6447 return fd;
6448
6449 unlink(p);
6450 return fd;
6451 }
6452
6453 int fd_warn_permissions(const char *path, int fd) {
6454 struct stat st;
6455
6456 if (fstat(fd, &st) < 0)
6457 return -errno;
6458
6459 if (st.st_mode & 0111)
6460 log_warning("Configuration file %s is marked executable. Please remove executable permission bits. Proceeding anyway.", path);
6461
6462 if (st.st_mode & 0002)
6463 log_warning("Configuration file %s is marked world-writable. Please remove world writability permission bits. Proceeding anyway.", path);
6464
6465 if (getpid() == 1 && (st.st_mode & 0044) != 0044)
6466 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);
6467
6468 return 0;
6469 }
6470
6471 unsigned long personality_from_string(const char *p) {
6472
6473 /* Parse a personality specifier. We introduce our own
6474 * identifiers that indicate specific ABIs, rather than just
6475 * hints regarding the register size, since we want to keep
6476 * things open for multiple locally supported ABIs for the
6477 * same register size. We try to reuse the ABI identifiers
6478 * used by libseccomp. */
6479
6480 #if defined(__x86_64__)
6481
6482 if (streq(p, "x86"))
6483 return PER_LINUX32;
6484
6485 if (streq(p, "x86-64"))
6486 return PER_LINUX;
6487
6488 #elif defined(__i386__)
6489
6490 if (streq(p, "x86"))
6491 return PER_LINUX;
6492 #endif
6493
6494 /* personality(7) documents that 0xffffffffUL is used for
6495 * querying the current personality, hence let's use that here
6496 * as error indicator. */
6497 return 0xffffffffUL;
6498 }
6499
6500 const char* personality_to_string(unsigned long p) {
6501
6502 #if defined(__x86_64__)
6503
6504 if (p == PER_LINUX32)
6505 return "x86";
6506
6507 if (p == PER_LINUX)
6508 return "x86-64";
6509
6510 #elif defined(__i386__)
6511
6512 if (p == PER_LINUX)
6513 return "x86";
6514 #endif
6515
6516 return NULL;
6517 }
6518
6519 uint64_t physical_memory(void) {
6520 long mem;
6521
6522 /* We return this as uint64_t in case we are running as 32bit
6523 * process on a 64bit kernel with huge amounts of memory */
6524
6525 mem = sysconf(_SC_PHYS_PAGES);
6526 assert(mem > 0);
6527
6528 return (uint64_t) mem * (uint64_t) page_size();
6529 }
6530
6531 char* mount_test_option(const char *haystack, const char *needle) {
6532
6533 struct mntent me = {
6534 .mnt_opts = (char*) haystack
6535 };
6536
6537 assert(needle);
6538
6539 /* Like glibc's hasmntopt(), but works on a string, not a
6540 * struct mntent */
6541
6542 if (!haystack)
6543 return NULL;
6544
6545 return hasmntopt(&me, needle);
6546 }
6547
6548 void hexdump(FILE *f, const void *p, size_t s) {
6549 const uint8_t *b = p;
6550 unsigned n = 0;
6551
6552 assert(s == 0 || b);
6553
6554 while (s > 0) {
6555 size_t i;
6556
6557 fprintf(f, "%04x ", n);
6558
6559 for (i = 0; i < 16; i++) {
6560
6561 if (i >= s)
6562 fputs(" ", f);
6563 else
6564 fprintf(f, "%02x ", b[i]);
6565
6566 if (i == 7)
6567 fputc(' ', f);
6568 }
6569
6570 fputc(' ', f);
6571
6572 for (i = 0; i < 16; i++) {
6573
6574 if (i >= s)
6575 fputc(' ', f);
6576 else
6577 fputc(isprint(b[i]) ? (char) b[i] : '.', f);
6578 }
6579
6580 fputc('\n', f);
6581
6582 if (s < 16)
6583 break;
6584
6585 n += 16;
6586 b += 16;
6587 s -= 16;
6588 }
6589 }
6590
6591 int update_reboot_param_file(const char *param) {
6592 int r = 0;
6593
6594 if (param) {
6595
6596 r = write_string_file(REBOOT_PARAM_FILE, param);
6597 if (r < 0)
6598 log_error("Failed to write reboot param to "
6599 REBOOT_PARAM_FILE": %s", strerror(-r));
6600 } else
6601 unlink(REBOOT_PARAM_FILE);
6602
6603 return r;
6604 }
6605
6606 int umount_recursive(const char *prefix, int flags) {
6607 bool again;
6608 int n = 0, r;
6609
6610 /* Try to umount everything recursively below a
6611 * directory. Also, take care of stacked mounts, and keep
6612 * unmounting them until they are gone. */
6613
6614 do {
6615 _cleanup_fclose_ FILE *proc_self_mountinfo = NULL;
6616
6617 again = false;
6618 r = 0;
6619
6620 proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
6621 if (!proc_self_mountinfo)
6622 return -errno;
6623
6624 for (;;) {
6625 _cleanup_free_ char *path = NULL, *p = NULL;
6626 int k;
6627
6628 k = fscanf(proc_self_mountinfo,
6629 "%*s " /* (1) mount id */
6630 "%*s " /* (2) parent id */
6631 "%*s " /* (3) major:minor */
6632 "%*s " /* (4) root */
6633 "%ms " /* (5) mount point */
6634 "%*s" /* (6) mount options */
6635 "%*[^-]" /* (7) optional fields */
6636 "- " /* (8) separator */
6637 "%*s " /* (9) file system type */
6638 "%*s" /* (10) mount source */
6639 "%*s" /* (11) mount options 2 */
6640 "%*[^\n]", /* some rubbish at the end */
6641 &path);
6642 if (k != 1) {
6643 if (k == EOF)
6644 break;
6645
6646 continue;
6647 }
6648
6649 p = cunescape(path);
6650 if (!p)
6651 return -ENOMEM;
6652
6653 if (!path_startswith(p, prefix))
6654 continue;
6655
6656 if (umount2(p, flags) < 0) {
6657 r = -errno;
6658 continue;
6659 }
6660
6661 again = true;
6662 n++;
6663
6664 break;
6665 }
6666
6667 } while (again);
6668
6669 return r ? r : n;
6670 }
6671
6672 int bind_remount_recursive(const char *prefix, bool ro) {
6673 _cleanup_set_free_free_ Set *done = NULL;
6674 _cleanup_free_ char *cleaned = NULL;
6675 int r;
6676
6677 /* Recursively remount a directory (and all its submounts)
6678 * read-only or read-write. If the directory is already
6679 * mounted, we reuse the mount and simply mark it
6680 * MS_BIND|MS_RDONLY (or remove the MS_RDONLY for read-write
6681 * operation). If it isn't we first make it one. Afterwards we
6682 * apply MS_BIND|MS_RDONLY (or remove MS_RDONLY) to all
6683 * submounts we can access, too. When mounts are stacked on
6684 * the same mount point we only care for each individual
6685 * "top-level" mount on each point, as we cannot
6686 * influence/access the underlying mounts anyway. We do not
6687 * have any effect on future submounts that might get
6688 * propagated, they migt be writable. This includes future
6689 * submounts that have been triggered via autofs. */
6690
6691 cleaned = strdup(prefix);
6692 if (!cleaned)
6693 return -ENOMEM;
6694
6695 path_kill_slashes(cleaned);
6696
6697 done = set_new(&string_hash_ops);
6698 if (!done)
6699 return -ENOMEM;
6700
6701 for (;;) {
6702 _cleanup_fclose_ FILE *proc_self_mountinfo = NULL;
6703 _cleanup_set_free_free_ Set *todo = NULL;
6704 bool top_autofs = false;
6705 char *x;
6706
6707 todo = set_new(&string_hash_ops);
6708 if (!todo)
6709 return -ENOMEM;
6710
6711 proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
6712 if (!proc_self_mountinfo)
6713 return -errno;
6714
6715 for (;;) {
6716 _cleanup_free_ char *path = NULL, *p = NULL, *type = NULL;
6717 int k;
6718
6719 k = fscanf(proc_self_mountinfo,
6720 "%*s " /* (1) mount id */
6721 "%*s " /* (2) parent id */
6722 "%*s " /* (3) major:minor */
6723 "%*s " /* (4) root */
6724 "%ms " /* (5) mount point */
6725 "%*s" /* (6) mount options (superblock) */
6726 "%*[^-]" /* (7) optional fields */
6727 "- " /* (8) separator */
6728 "%ms " /* (9) file system type */
6729 "%*s" /* (10) mount source */
6730 "%*s" /* (11) mount options (bind mount) */
6731 "%*[^\n]", /* some rubbish at the end */
6732 &path,
6733 &type);
6734 if (k != 2) {
6735 if (k == EOF)
6736 break;
6737
6738 continue;
6739 }
6740
6741 p = cunescape(path);
6742 if (!p)
6743 return -ENOMEM;
6744
6745 /* Let's ignore autofs mounts. If they aren't
6746 * triggered yet, we want to avoid triggering
6747 * them, as we don't make any guarantees for
6748 * future submounts anyway. If they are
6749 * already triggered, then we will find
6750 * another entry for this. */
6751 if (streq(type, "autofs")) {
6752 top_autofs = top_autofs || path_equal(cleaned, p);
6753 continue;
6754 }
6755
6756 if (path_startswith(p, cleaned) &&
6757 !set_contains(done, p)) {
6758
6759 r = set_consume(todo, p);
6760 p = NULL;
6761
6762 if (r == -EEXIST)
6763 continue;
6764 if (r < 0)
6765 return r;
6766 }
6767 }
6768
6769 /* If we have no submounts to process anymore and if
6770 * the root is either already done, or an autofs, we
6771 * are done */
6772 if (set_isempty(todo) &&
6773 (top_autofs || set_contains(done, cleaned)))
6774 return 0;
6775
6776 if (!set_contains(done, cleaned) &&
6777 !set_contains(todo, cleaned)) {
6778 /* The prefix directory itself is not yet a
6779 * mount, make it one. */
6780 if (mount(cleaned, cleaned, NULL, MS_BIND|MS_REC, NULL) < 0)
6781 return -errno;
6782
6783 if (mount(NULL, prefix, NULL, MS_BIND|MS_REMOUNT|(ro ? MS_RDONLY : 0), NULL) < 0)
6784 return -errno;
6785
6786 x = strdup(cleaned);
6787 if (!x)
6788 return -ENOMEM;
6789
6790 r = set_consume(done, x);
6791 if (r < 0)
6792 return r;
6793 }
6794
6795 while ((x = set_steal_first(todo))) {
6796
6797 r = set_consume(done, x);
6798 if (r == -EEXIST)
6799 continue;
6800 if (r < 0)
6801 return r;
6802
6803 if (mount(NULL, x, NULL, MS_BIND|MS_REMOUNT|(ro ? MS_RDONLY : 0), NULL) < 0) {
6804
6805 /* Deal with mount points that are
6806 * obstructed by a later mount */
6807
6808 if (errno != ENOENT)
6809 return -errno;
6810 }
6811
6812 }
6813 }
6814 }
6815
6816 int fflush_and_check(FILE *f) {
6817 assert(f);
6818
6819 errno = 0;
6820 fflush(f);
6821
6822 if (ferror(f))
6823 return errno ? -errno : -EIO;
6824
6825 return 0;
6826 }
6827
6828 char *tempfn_xxxxxx(const char *p) {
6829 const char *fn;
6830 char *t;
6831 size_t k;
6832
6833 assert(p);
6834
6835 t = new(char, strlen(p) + 1 + 6 + 1);
6836 if (!t)
6837 return NULL;
6838
6839 fn = basename(p);
6840 k = fn - p;
6841
6842 strcpy(stpcpy(stpcpy(mempcpy(t, p, k), "."), fn), "XXXXXX");
6843
6844 return t;
6845 }
6846
6847 char *tempfn_random(const char *p) {
6848 const char *fn;
6849 char *t, *x;
6850 uint64_t u;
6851 size_t k;
6852 unsigned i;
6853
6854 assert(p);
6855
6856 t = new(char, strlen(p) + 1 + 16 + 1);
6857 if (!t)
6858 return NULL;
6859
6860 fn = basename(p);
6861 k = fn - p;
6862
6863 x = stpcpy(stpcpy(mempcpy(t, p, k), "."), fn);
6864
6865 u = random_u64();
6866 for (i = 0; i < 16; i++) {
6867 *(x++) = hexchar(u & 0xF);
6868 u >>= 4;
6869 }
6870
6871 *x = 0;
6872
6873 return t;
6874 }
6875
6876 /* make sure the hostname is not "localhost" */
6877 bool is_localhost(const char *hostname) {
6878 assert(hostname);
6879
6880 /* This tries to identify local host and domain names
6881 * described in RFC6761 plus the redhatism of .localdomain */
6882
6883 return streq(hostname, "localhost") ||
6884 streq(hostname, "localhost.") ||
6885 streq(hostname, "localdomain.") ||
6886 streq(hostname, "localdomain") ||
6887 endswith(hostname, ".localhost") ||
6888 endswith(hostname, ".localhost.") ||
6889 endswith(hostname, ".localdomain") ||
6890 endswith(hostname, ".localdomain.");
6891 }
6892
6893 int take_password_lock(const char *root) {
6894
6895 struct flock flock = {
6896 .l_type = F_WRLCK,
6897 .l_whence = SEEK_SET,
6898 .l_start = 0,
6899 .l_len = 0,
6900 };
6901
6902 const char *path;
6903 int fd, r;
6904
6905 /* This is roughly the same as lckpwdf(), but not as awful. We
6906 * don't want to use alarm() and signals, hence we implement
6907 * our own trivial version of this.
6908 *
6909 * Note that shadow-utils also takes per-database locks in
6910 * addition to lckpwdf(). However, we don't given that they
6911 * are redundant as they they invoke lckpwdf() first and keep
6912 * it during everything they do. The per-database locks are
6913 * awfully racy, and thus we just won't do them. */
6914
6915 if (root)
6916 path = strappenda(root, "/etc/.pwd.lock");
6917 else
6918 path = "/etc/.pwd.lock";
6919
6920 fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0600);
6921 if (fd < 0)
6922 return -errno;
6923
6924 r = fcntl(fd, F_SETLKW, &flock);
6925 if (r < 0) {
6926 safe_close(fd);
6927 return -errno;
6928 }
6929
6930 return fd;
6931 }
6932
6933 int is_symlink(const char *path) {
6934 struct stat info;
6935
6936 if (lstat(path, &info) < 0)
6937 return -errno;
6938
6939 if (S_ISLNK(info.st_mode))
6940 return 1;
6941
6942 return 0;
6943 }
6944
6945 int unquote_first_word(const char **p, char **ret) {
6946 _cleanup_free_ char *s = NULL;
6947 size_t allocated = 0, sz = 0;
6948
6949 enum {
6950 START,
6951 VALUE,
6952 VALUE_ESCAPE,
6953 SINGLE_QUOTE,
6954 SINGLE_QUOTE_ESCAPE,
6955 DOUBLE_QUOTE,
6956 DOUBLE_QUOTE_ESCAPE,
6957 SPACE,
6958 } state = START;
6959
6960 assert(p);
6961 assert(*p);
6962 assert(ret);
6963
6964 /* Parses the first word of a string, and returns it in
6965 * *ret. Removes all quotes in the process. When parsing fails
6966 * (because of an uneven number of quotes or similar), leaves
6967 * the pointer *p at the first invalid character. */
6968
6969 for (;;) {
6970 char c = **p;
6971
6972 switch (state) {
6973
6974 case START:
6975 if (c == 0)
6976 goto finish;
6977 else if (strchr(WHITESPACE, c))
6978 break;
6979
6980 state = VALUE;
6981 /* fallthrough */
6982
6983 case VALUE:
6984 if (c == 0)
6985 goto finish;
6986 else if (c == '\'')
6987 state = SINGLE_QUOTE;
6988 else if (c == '\\')
6989 state = VALUE_ESCAPE;
6990 else if (c == '\"')
6991 state = DOUBLE_QUOTE;
6992 else if (strchr(WHITESPACE, c))
6993 state = SPACE;
6994 else {
6995 if (!GREEDY_REALLOC(s, allocated, sz+2))
6996 return -ENOMEM;
6997
6998 s[sz++] = c;
6999 }
7000
7001 break;
7002
7003 case VALUE_ESCAPE:
7004 if (c == 0)
7005 return -EINVAL;
7006
7007 if (!GREEDY_REALLOC(s, allocated, sz+2))
7008 return -ENOMEM;
7009
7010 s[sz++] = c;
7011 state = VALUE;
7012
7013 break;
7014
7015 case SINGLE_QUOTE:
7016 if (c == 0)
7017 return -EINVAL;
7018 else if (c == '\'')
7019 state = VALUE;
7020 else if (c == '\\')
7021 state = SINGLE_QUOTE_ESCAPE;
7022 else {
7023 if (!GREEDY_REALLOC(s, allocated, sz+2))
7024 return -ENOMEM;
7025
7026 s[sz++] = c;
7027 }
7028
7029 break;
7030
7031 case SINGLE_QUOTE_ESCAPE:
7032 if (c == 0)
7033 return -EINVAL;
7034
7035 if (!GREEDY_REALLOC(s, allocated, sz+2))
7036 return -ENOMEM;
7037
7038 s[sz++] = c;
7039 state = SINGLE_QUOTE;
7040 break;
7041
7042 case DOUBLE_QUOTE:
7043 if (c == 0)
7044 return -EINVAL;
7045 else if (c == '\"')
7046 state = VALUE;
7047 else if (c == '\\')
7048 state = DOUBLE_QUOTE_ESCAPE;
7049 else {
7050 if (!GREEDY_REALLOC(s, allocated, sz+2))
7051 return -ENOMEM;
7052
7053 s[sz++] = c;
7054 }
7055
7056 break;
7057
7058 case DOUBLE_QUOTE_ESCAPE:
7059 if (c == 0)
7060 return -EINVAL;
7061
7062 if (!GREEDY_REALLOC(s, allocated, sz+2))
7063 return -ENOMEM;
7064
7065 s[sz++] = c;
7066 state = DOUBLE_QUOTE;
7067 break;
7068
7069 case SPACE:
7070 if (c == 0)
7071 goto finish;
7072 if (!strchr(WHITESPACE, c))
7073 goto finish;
7074
7075 break;
7076 }
7077
7078 (*p) ++;
7079 }
7080
7081 finish:
7082 if (!s) {
7083 *ret = NULL;
7084 return 0;
7085 }
7086
7087 s[sz] = 0;
7088 *ret = s;
7089 s = NULL;
7090
7091 return 1;
7092 }
7093
7094 int unquote_many_words(const char **p, ...) {
7095 va_list ap;
7096 char **l;
7097 int n = 0, i, c, r;
7098
7099 /* Parses a number of words from a string, stripping any
7100 * quotes if necessary. */
7101
7102 assert(p);
7103
7104 /* Count how many words are expected */
7105 va_start(ap, p);
7106 for (;;) {
7107 if (!va_arg(ap, char **))
7108 break;
7109 n++;
7110 }
7111 va_end(ap);
7112
7113 if (n <= 0)
7114 return 0;
7115
7116 /* Read all words into a temporary array */
7117 l = newa0(char*, n);
7118 for (c = 0; c < n; c++) {
7119
7120 r = unquote_first_word(p, &l[c]);
7121 if (r < 0) {
7122 int j;
7123
7124 for (j = 0; j < c; j++)
7125 free(l[j]);
7126
7127 return r;
7128 }
7129
7130 if (r == 0)
7131 break;
7132 }
7133
7134 /* If we managed to parse all words, return them in the passed
7135 * in parameters */
7136 va_start(ap, p);
7137 for (i = 0; i < n; i++) {
7138 char **v;
7139
7140 v = va_arg(ap, char **);
7141 assert(v);
7142
7143 *v = l[i];
7144 }
7145 va_end(ap);
7146
7147 return c;
7148 }
7149
7150 int free_and_strdup(char **p, const char *s) {
7151 char *t;
7152
7153 assert(p);
7154
7155 /* Replaces a string pointer with an strdup()ed new string,
7156 * possibly freeing the old one. */
7157
7158 if (s) {
7159 t = strdup(s);
7160 if (!t)
7161 return -ENOMEM;
7162 } else
7163 t = NULL;
7164
7165 free(*p);
7166 *p = t;
7167
7168 return 0;
7169 }
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