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fix sparse warnings
[thirdparty/systemd.git] / src / util.c
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 General Public License as published by
10 the Free Software Foundation; either version 2 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 General Public License for more details.
17
18 You should have received a copy of the GNU 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 <libgen.h>
45 #include <ctype.h>
46 #include <sys/prctl.h>
47 #include <sys/utsname.h>
48 #include <pwd.h>
49 #include <netinet/ip.h>
50 #include <linux/kd.h>
51 #include <dlfcn.h>
52 #include <sys/wait.h>
53 #include <sys/capability.h>
54 #include <sys/time.h>
55 #include <linux/rtc.h>
56 #include <glob.h>
57 #include <grp.h>
58 #include <sys/mman.h>
59
60 #include "macro.h"
61 #include "util.h"
62 #include "ioprio.h"
63 #include "missing.h"
64 #include "log.h"
65 #include "strv.h"
66 #include "label.h"
67 #include "exit-status.h"
68 #include "hashmap.h"
69
70 int saved_argc = 0;
71 char **saved_argv = NULL;
72
73 size_t page_size(void) {
74 static __thread size_t pgsz = 0;
75 long r;
76
77 if (_likely_(pgsz > 0))
78 return pgsz;
79
80 assert_se((r = sysconf(_SC_PAGESIZE)) > 0);
81
82 pgsz = (size_t) r;
83
84 return pgsz;
85 }
86
87 bool streq_ptr(const char *a, const char *b) {
88
89 /* Like streq(), but tries to make sense of NULL pointers */
90
91 if (a && b)
92 return streq(a, b);
93
94 if (!a && !b)
95 return true;
96
97 return false;
98 }
99
100 usec_t now(clockid_t clock_id) {
101 struct timespec ts;
102
103 assert_se(clock_gettime(clock_id, &ts) == 0);
104
105 return timespec_load(&ts);
106 }
107
108 dual_timestamp* dual_timestamp_get(dual_timestamp *ts) {
109 assert(ts);
110
111 ts->realtime = now(CLOCK_REALTIME);
112 ts->monotonic = now(CLOCK_MONOTONIC);
113
114 return ts;
115 }
116
117 dual_timestamp* dual_timestamp_from_realtime(dual_timestamp *ts, usec_t u) {
118 int64_t delta;
119 assert(ts);
120
121 ts->realtime = u;
122
123 if (u == 0)
124 ts->monotonic = 0;
125 else {
126 delta = (int64_t) now(CLOCK_REALTIME) - (int64_t) u;
127
128 ts->monotonic = now(CLOCK_MONOTONIC);
129
130 if ((int64_t) ts->monotonic > delta)
131 ts->monotonic -= delta;
132 else
133 ts->monotonic = 0;
134 }
135
136 return ts;
137 }
138
139 usec_t timespec_load(const struct timespec *ts) {
140 assert(ts);
141
142 return
143 (usec_t) ts->tv_sec * USEC_PER_SEC +
144 (usec_t) ts->tv_nsec / NSEC_PER_USEC;
145 }
146
147 struct timespec *timespec_store(struct timespec *ts, usec_t u) {
148 assert(ts);
149
150 ts->tv_sec = (time_t) (u / USEC_PER_SEC);
151 ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
152
153 return ts;
154 }
155
156 usec_t timeval_load(const struct timeval *tv) {
157 assert(tv);
158
159 return
160 (usec_t) tv->tv_sec * USEC_PER_SEC +
161 (usec_t) tv->tv_usec;
162 }
163
164 struct timeval *timeval_store(struct timeval *tv, usec_t u) {
165 assert(tv);
166
167 tv->tv_sec = (time_t) (u / USEC_PER_SEC);
168 tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
169
170 return tv;
171 }
172
173 bool endswith(const char *s, const char *postfix) {
174 size_t sl, pl;
175
176 assert(s);
177 assert(postfix);
178
179 sl = strlen(s);
180 pl = strlen(postfix);
181
182 if (pl == 0)
183 return true;
184
185 if (sl < pl)
186 return false;
187
188 return memcmp(s + sl - pl, postfix, pl) == 0;
189 }
190
191 bool startswith(const char *s, const char *prefix) {
192 size_t sl, pl;
193
194 assert(s);
195 assert(prefix);
196
197 sl = strlen(s);
198 pl = strlen(prefix);
199
200 if (pl == 0)
201 return true;
202
203 if (sl < pl)
204 return false;
205
206 return memcmp(s, prefix, pl) == 0;
207 }
208
209 bool startswith_no_case(const char *s, const char *prefix) {
210 size_t sl, pl;
211 unsigned i;
212
213 assert(s);
214 assert(prefix);
215
216 sl = strlen(s);
217 pl = strlen(prefix);
218
219 if (pl == 0)
220 return true;
221
222 if (sl < pl)
223 return false;
224
225 for(i = 0; i < pl; ++i) {
226 if (tolower(s[i]) != tolower(prefix[i]))
227 return false;
228 }
229
230 return true;
231 }
232
233 bool first_word(const char *s, const char *word) {
234 size_t sl, wl;
235
236 assert(s);
237 assert(word);
238
239 sl = strlen(s);
240 wl = strlen(word);
241
242 if (sl < wl)
243 return false;
244
245 if (wl == 0)
246 return true;
247
248 if (memcmp(s, word, wl) != 0)
249 return false;
250
251 return s[wl] == 0 ||
252 strchr(WHITESPACE, s[wl]);
253 }
254
255 int close_nointr(int fd) {
256 assert(fd >= 0);
257
258 for (;;) {
259 int r;
260
261 r = close(fd);
262 if (r >= 0)
263 return r;
264
265 if (errno != EINTR)
266 return -errno;
267 }
268 }
269
270 void close_nointr_nofail(int fd) {
271 int saved_errno = errno;
272
273 /* like close_nointr() but cannot fail, and guarantees errno
274 * is unchanged */
275
276 assert_se(close_nointr(fd) == 0);
277
278 errno = saved_errno;
279 }
280
281 void close_many(const int fds[], unsigned n_fd) {
282 unsigned i;
283
284 for (i = 0; i < n_fd; i++)
285 close_nointr_nofail(fds[i]);
286 }
287
288 int parse_boolean(const char *v) {
289 assert(v);
290
291 if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on"))
292 return 1;
293 else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off"))
294 return 0;
295
296 return -EINVAL;
297 }
298
299 int parse_pid(const char *s, pid_t* ret_pid) {
300 unsigned long ul = 0;
301 pid_t pid;
302 int r;
303
304 assert(s);
305 assert(ret_pid);
306
307 if ((r = safe_atolu(s, &ul)) < 0)
308 return r;
309
310 pid = (pid_t) ul;
311
312 if ((unsigned long) pid != ul)
313 return -ERANGE;
314
315 if (pid <= 0)
316 return -ERANGE;
317
318 *ret_pid = pid;
319 return 0;
320 }
321
322 int parse_uid(const char *s, uid_t* ret_uid) {
323 unsigned long ul = 0;
324 uid_t uid;
325 int r;
326
327 assert(s);
328 assert(ret_uid);
329
330 if ((r = safe_atolu(s, &ul)) < 0)
331 return r;
332
333 uid = (uid_t) ul;
334
335 if ((unsigned long) uid != ul)
336 return -ERANGE;
337
338 *ret_uid = uid;
339 return 0;
340 }
341
342 int safe_atou(const char *s, unsigned *ret_u) {
343 char *x = NULL;
344 unsigned long l;
345
346 assert(s);
347 assert(ret_u);
348
349 errno = 0;
350 l = strtoul(s, &x, 0);
351
352 if (!x || *x || errno)
353 return errno ? -errno : -EINVAL;
354
355 if ((unsigned long) (unsigned) l != l)
356 return -ERANGE;
357
358 *ret_u = (unsigned) l;
359 return 0;
360 }
361
362 int safe_atoi(const char *s, int *ret_i) {
363 char *x = NULL;
364 long l;
365
366 assert(s);
367 assert(ret_i);
368
369 errno = 0;
370 l = strtol(s, &x, 0);
371
372 if (!x || *x || errno)
373 return errno ? -errno : -EINVAL;
374
375 if ((long) (int) l != l)
376 return -ERANGE;
377
378 *ret_i = (int) l;
379 return 0;
380 }
381
382 int safe_atollu(const char *s, long long unsigned *ret_llu) {
383 char *x = NULL;
384 unsigned long long l;
385
386 assert(s);
387 assert(ret_llu);
388
389 errno = 0;
390 l = strtoull(s, &x, 0);
391
392 if (!x || *x || errno)
393 return errno ? -errno : -EINVAL;
394
395 *ret_llu = l;
396 return 0;
397 }
398
399 int safe_atolli(const char *s, long long int *ret_lli) {
400 char *x = NULL;
401 long long l;
402
403 assert(s);
404 assert(ret_lli);
405
406 errno = 0;
407 l = strtoll(s, &x, 0);
408
409 if (!x || *x || errno)
410 return errno ? -errno : -EINVAL;
411
412 *ret_lli = l;
413 return 0;
414 }
415
416 /* Split a string into words. */
417 char *split(const char *c, size_t *l, const char *separator, char **state) {
418 char *current;
419
420 current = *state ? *state : (char*) c;
421
422 if (!*current || *c == 0)
423 return NULL;
424
425 current += strspn(current, separator);
426 *l = strcspn(current, separator);
427 *state = current+*l;
428
429 return (char*) current;
430 }
431
432 /* Split a string into words, but consider strings enclosed in '' and
433 * "" as words even if they include spaces. */
434 char *split_quoted(const char *c, size_t *l, char **state) {
435 char *current, *e;
436 bool escaped = false;
437
438 current = *state ? *state : (char*) c;
439
440 if (!*current || *c == 0)
441 return NULL;
442
443 current += strspn(current, WHITESPACE);
444
445 if (*current == '\'') {
446 current ++;
447
448 for (e = current; *e; e++) {
449 if (escaped)
450 escaped = false;
451 else if (*e == '\\')
452 escaped = true;
453 else if (*e == '\'')
454 break;
455 }
456
457 *l = e-current;
458 *state = *e == 0 ? e : e+1;
459 } else if (*current == '\"') {
460 current ++;
461
462 for (e = current; *e; e++) {
463 if (escaped)
464 escaped = false;
465 else if (*e == '\\')
466 escaped = true;
467 else if (*e == '\"')
468 break;
469 }
470
471 *l = e-current;
472 *state = *e == 0 ? e : e+1;
473 } else {
474 for (e = current; *e; e++) {
475 if (escaped)
476 escaped = false;
477 else if (*e == '\\')
478 escaped = true;
479 else if (strchr(WHITESPACE, *e))
480 break;
481 }
482 *l = e-current;
483 *state = e;
484 }
485
486 return (char*) current;
487 }
488
489 char **split_path_and_make_absolute(const char *p) {
490 char **l;
491 assert(p);
492
493 if (!(l = strv_split(p, ":")))
494 return NULL;
495
496 if (!strv_path_make_absolute_cwd(l)) {
497 strv_free(l);
498 return NULL;
499 }
500
501 return l;
502 }
503
504 int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
505 int r;
506 FILE *f;
507 char fn[PATH_MAX], line[LINE_MAX], *p;
508 long unsigned ppid;
509
510 assert(pid > 0);
511 assert(_ppid);
512
513 assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%lu/stat", (unsigned long) pid) < (int) (sizeof(fn)-1));
514 char_array_0(fn);
515
516 if (!(f = fopen(fn, "re")))
517 return -errno;
518
519 if (!(fgets(line, sizeof(line), f))) {
520 r = feof(f) ? -EIO : -errno;
521 fclose(f);
522 return r;
523 }
524
525 fclose(f);
526
527 /* Let's skip the pid and comm fields. The latter is enclosed
528 * in () but does not escape any () in its value, so let's
529 * skip over it manually */
530
531 if (!(p = strrchr(line, ')')))
532 return -EIO;
533
534 p++;
535
536 if (sscanf(p, " "
537 "%*c " /* state */
538 "%lu ", /* ppid */
539 &ppid) != 1)
540 return -EIO;
541
542 if ((long unsigned) (pid_t) ppid != ppid)
543 return -ERANGE;
544
545 *_ppid = (pid_t) ppid;
546
547 return 0;
548 }
549
550 int get_starttime_of_pid(pid_t pid, unsigned long long *st) {
551 int r;
552 FILE *f;
553 char fn[PATH_MAX], line[LINE_MAX], *p;
554
555 assert(pid > 0);
556 assert(st);
557
558 assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%lu/stat", (unsigned long) pid) < (int) (sizeof(fn)-1));
559 char_array_0(fn);
560
561 if (!(f = fopen(fn, "re")))
562 return -errno;
563
564 if (!(fgets(line, sizeof(line), f))) {
565 r = feof(f) ? -EIO : -errno;
566 fclose(f);
567 return r;
568 }
569
570 fclose(f);
571
572 /* Let's skip the pid and comm fields. The latter is enclosed
573 * in () but does not escape any () in its value, so let's
574 * skip over it manually */
575
576 if (!(p = strrchr(line, ')')))
577 return -EIO;
578
579 p++;
580
581 if (sscanf(p, " "
582 "%*c " /* state */
583 "%*d " /* ppid */
584 "%*d " /* pgrp */
585 "%*d " /* session */
586 "%*d " /* tty_nr */
587 "%*d " /* tpgid */
588 "%*u " /* flags */
589 "%*u " /* minflt */
590 "%*u " /* cminflt */
591 "%*u " /* majflt */
592 "%*u " /* cmajflt */
593 "%*u " /* utime */
594 "%*u " /* stime */
595 "%*d " /* cutime */
596 "%*d " /* cstime */
597 "%*d " /* priority */
598 "%*d " /* nice */
599 "%*d " /* num_threads */
600 "%*d " /* itrealvalue */
601 "%llu " /* starttime */,
602 st) != 1)
603 return -EIO;
604
605 return 0;
606 }
607
608 int write_one_line_file(const char *fn, const char *line) {
609 FILE *f;
610 int r;
611
612 assert(fn);
613 assert(line);
614
615 if (!(f = fopen(fn, "we")))
616 return -errno;
617
618 errno = 0;
619 if (fputs(line, f) < 0) {
620 r = -errno;
621 goto finish;
622 }
623
624 if (!endswith(line, "\n"))
625 fputc('\n', f);
626
627 fflush(f);
628
629 if (ferror(f)) {
630 if (errno != 0)
631 r = -errno;
632 else
633 r = -EIO;
634 } else
635 r = 0;
636
637 finish:
638 fclose(f);
639 return r;
640 }
641
642 int fchmod_umask(int fd, mode_t m) {
643 mode_t u;
644 int r;
645
646 u = umask(0777);
647 r = fchmod(fd, m & (~u)) < 0 ? -errno : 0;
648 umask(u);
649
650 return r;
651 }
652
653 int write_one_line_file_atomic(const char *fn, const char *line) {
654 FILE *f;
655 int r;
656 char *p;
657
658 assert(fn);
659 assert(line);
660
661 r = fopen_temporary(fn, &f, &p);
662 if (r < 0)
663 return r;
664
665 fchmod_umask(fileno(f), 0644);
666
667 errno = 0;
668 if (fputs(line, f) < 0) {
669 r = -errno;
670 goto finish;
671 }
672
673 if (!endswith(line, "\n"))
674 fputc('\n', f);
675
676 fflush(f);
677
678 if (ferror(f)) {
679 if (errno != 0)
680 r = -errno;
681 else
682 r = -EIO;
683 } else {
684 if (rename(p, fn) < 0)
685 r = -errno;
686 else
687 r = 0;
688 }
689
690 finish:
691 if (r < 0)
692 unlink(p);
693
694 fclose(f);
695 free(p);
696
697 return r;
698 }
699
700 int read_one_line_file(const char *fn, char **line) {
701 FILE *f;
702 int r;
703 char t[LINE_MAX], *c;
704
705 assert(fn);
706 assert(line);
707
708 f = fopen(fn, "re");
709 if (!f)
710 return -errno;
711
712 if (!fgets(t, sizeof(t), f)) {
713
714 if (ferror(f)) {
715 r = -errno;
716 goto finish;
717 }
718
719 t[0] = 0;
720 }
721
722 c = strdup(t);
723 if (!c) {
724 r = -ENOMEM;
725 goto finish;
726 }
727
728 truncate_nl(c);
729
730 *line = c;
731 r = 0;
732
733 finish:
734 fclose(f);
735 return r;
736 }
737
738 int read_full_file(const char *fn, char **contents, size_t *size) {
739 FILE *f;
740 int r;
741 size_t n, l;
742 char *buf = NULL;
743 struct stat st;
744
745 if (!(f = fopen(fn, "re")))
746 return -errno;
747
748 if (fstat(fileno(f), &st) < 0) {
749 r = -errno;
750 goto finish;
751 }
752
753 /* Safety check */
754 if (st.st_size > 4*1024*1024) {
755 r = -E2BIG;
756 goto finish;
757 }
758
759 n = st.st_size > 0 ? st.st_size : LINE_MAX;
760 l = 0;
761
762 for (;;) {
763 char *t;
764 size_t k;
765
766 if (!(t = realloc(buf, n+1))) {
767 r = -ENOMEM;
768 goto finish;
769 }
770
771 buf = t;
772 k = fread(buf + l, 1, n - l, f);
773
774 if (k <= 0) {
775 if (ferror(f)) {
776 r = -errno;
777 goto finish;
778 }
779
780 break;
781 }
782
783 l += k;
784 n *= 2;
785
786 /* Safety check */
787 if (n > 4*1024*1024) {
788 r = -E2BIG;
789 goto finish;
790 }
791 }
792
793 buf[l] = 0;
794 *contents = buf;
795 buf = NULL;
796
797 if (size)
798 *size = l;
799
800 r = 0;
801
802 finish:
803 fclose(f);
804 free(buf);
805
806 return r;
807 }
808
809 int parse_env_file(
810 const char *fname,
811 const char *separator, ...) {
812
813 int r = 0;
814 char *contents = NULL, *p;
815
816 assert(fname);
817 assert(separator);
818
819 if ((r = read_full_file(fname, &contents, NULL)) < 0)
820 return r;
821
822 p = contents;
823 for (;;) {
824 const char *key = NULL;
825
826 p += strspn(p, separator);
827 p += strspn(p, WHITESPACE);
828
829 if (!*p)
830 break;
831
832 if (!strchr(COMMENTS, *p)) {
833 va_list ap;
834 char **value;
835
836 va_start(ap, separator);
837 while ((key = va_arg(ap, char *))) {
838 size_t n;
839 char *v;
840
841 value = va_arg(ap, char **);
842
843 n = strlen(key);
844 if (strncmp(p, key, n) != 0 ||
845 p[n] != '=')
846 continue;
847
848 p += n + 1;
849 n = strcspn(p, separator);
850
851 if (n >= 2 &&
852 strchr(QUOTES, p[0]) &&
853 p[n-1] == p[0])
854 v = strndup(p+1, n-2);
855 else
856 v = strndup(p, n);
857
858 if (!v) {
859 r = -ENOMEM;
860 va_end(ap);
861 goto fail;
862 }
863
864 if (v[0] == '\0') {
865 /* return empty value strings as NULL */
866 free(v);
867 v = NULL;
868 }
869
870 free(*value);
871 *value = v;
872
873 p += n;
874
875 r ++;
876 break;
877 }
878 va_end(ap);
879 }
880
881 if (!key)
882 p += strcspn(p, separator);
883 }
884
885 fail:
886 free(contents);
887 return r;
888 }
889
890 int load_env_file(
891 const char *fname,
892 char ***rl) {
893
894 FILE *f;
895 char **m = NULL;
896 int r;
897
898 assert(fname);
899 assert(rl);
900
901 if (!(f = fopen(fname, "re")))
902 return -errno;
903
904 while (!feof(f)) {
905 char l[LINE_MAX], *p, *u;
906 char **t;
907
908 if (!fgets(l, sizeof(l), f)) {
909 if (feof(f))
910 break;
911
912 r = -errno;
913 goto finish;
914 }
915
916 p = strstrip(l);
917
918 if (!*p)
919 continue;
920
921 if (strchr(COMMENTS, *p))
922 continue;
923
924 if (!(u = normalize_env_assignment(p))) {
925 log_error("Out of memory");
926 r = -ENOMEM;
927 goto finish;
928 }
929
930 t = strv_append(m, u);
931 free(u);
932
933 if (!t) {
934 log_error("Out of memory");
935 r = -ENOMEM;
936 goto finish;
937 }
938
939 strv_free(m);
940 m = t;
941 }
942
943 r = 0;
944
945 *rl = m;
946 m = NULL;
947
948 finish:
949 if (f)
950 fclose(f);
951
952 strv_free(m);
953
954 return r;
955 }
956
957 int write_env_file(const char *fname, char **l) {
958 char **i, *p;
959 FILE *f;
960 int r;
961
962 r = fopen_temporary(fname, &f, &p);
963 if (r < 0)
964 return r;
965
966 fchmod_umask(fileno(f), 0644);
967
968 errno = 0;
969 STRV_FOREACH(i, l) {
970 fputs(*i, f);
971 fputc('\n', f);
972 }
973
974 fflush(f);
975
976 if (ferror(f)) {
977 if (errno != 0)
978 r = -errno;
979 else
980 r = -EIO;
981 } else {
982 if (rename(p, fname) < 0)
983 r = -errno;
984 else
985 r = 0;
986 }
987
988 if (r < 0)
989 unlink(p);
990
991 fclose(f);
992 free(p);
993
994 return r;
995 }
996
997 char *truncate_nl(char *s) {
998 assert(s);
999
1000 s[strcspn(s, NEWLINE)] = 0;
1001 return s;
1002 }
1003
1004 int get_process_comm(pid_t pid, char **name) {
1005 int r;
1006
1007 assert(name);
1008
1009 if (pid == 0)
1010 r = read_one_line_file("/proc/self/comm", name);
1011 else {
1012 char *p;
1013 if (asprintf(&p, "/proc/%lu/comm", (unsigned long) pid) < 0)
1014 return -ENOMEM;
1015
1016 r = read_one_line_file(p, name);
1017 free(p);
1018 }
1019
1020 return r;
1021 }
1022
1023 int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) {
1024 char *r, *k;
1025 int c;
1026 bool space = false;
1027 size_t left;
1028 FILE *f;
1029
1030 assert(max_length > 0);
1031 assert(line);
1032
1033 if (pid == 0)
1034 f = fopen("/proc/self/cmdline", "re");
1035 else {
1036 char *p;
1037 if (asprintf(&p, "/proc/%lu/cmdline", (unsigned long) pid) < 0)
1038 return -ENOMEM;
1039
1040 f = fopen(p, "re");
1041 free(p);
1042 }
1043
1044 if (!f)
1045 return -errno;
1046
1047 r = new(char, max_length);
1048 if (!r) {
1049 fclose(f);
1050 return -ENOMEM;
1051 }
1052
1053 k = r;
1054 left = max_length;
1055 while ((c = getc(f)) != EOF) {
1056
1057 if (isprint(c)) {
1058 if (space) {
1059 if (left <= 4)
1060 break;
1061
1062 *(k++) = ' ';
1063 left--;
1064 space = false;
1065 }
1066
1067 if (left <= 4)
1068 break;
1069
1070 *(k++) = (char) c;
1071 left--;
1072 } else
1073 space = true;
1074 }
1075
1076 if (left <= 4) {
1077 size_t n = MIN(left-1, 3U);
1078 memcpy(k, "...", n);
1079 k[n] = 0;
1080 } else
1081 *k = 0;
1082
1083 fclose(f);
1084
1085 /* Kernel threads have no argv[] */
1086 if (r[0] == 0) {
1087 char *t;
1088 int h;
1089
1090 free(r);
1091
1092 if (!comm_fallback)
1093 return -ENOENT;
1094
1095 h = get_process_comm(pid, &t);
1096 if (h < 0)
1097 return h;
1098
1099 r = join("[", t, "]", NULL);
1100 free(t);
1101
1102 if (!r)
1103 return -ENOMEM;
1104 }
1105
1106 *line = r;
1107 return 0;
1108 }
1109
1110 int is_kernel_thread(pid_t pid) {
1111 char *p;
1112 size_t count;
1113 char c;
1114 bool eof;
1115 FILE *f;
1116
1117 if (pid == 0)
1118 return 0;
1119
1120 if (asprintf(&p, "/proc/%lu/cmdline", (unsigned long) pid) < 0)
1121 return -ENOMEM;
1122
1123 f = fopen(p, "re");
1124 free(p);
1125
1126 if (!f)
1127 return -errno;
1128
1129 count = fread(&c, 1, 1, f);
1130 eof = feof(f);
1131 fclose(f);
1132
1133 /* Kernel threads have an empty cmdline */
1134
1135 if (count <= 0)
1136 return eof ? 1 : -errno;
1137
1138 return 0;
1139 }
1140
1141 int get_process_exe(pid_t pid, char **name) {
1142 int r;
1143
1144 assert(name);
1145
1146 if (pid == 0)
1147 r = readlink_malloc("/proc/self/exe", name);
1148 else {
1149 char *p;
1150 if (asprintf(&p, "/proc/%lu/exe", (unsigned long) pid) < 0)
1151 return -ENOMEM;
1152
1153 r = readlink_malloc(p, name);
1154 free(p);
1155 }
1156
1157 return r;
1158 }
1159
1160 int get_process_uid(pid_t pid, uid_t *uid) {
1161 char *p;
1162 FILE *f;
1163 int r;
1164
1165 assert(uid);
1166
1167 if (pid == 0)
1168 return getuid();
1169
1170 if (asprintf(&p, "/proc/%lu/status", (unsigned long) pid) < 0)
1171 return -ENOMEM;
1172
1173 f = fopen(p, "re");
1174 free(p);
1175
1176 if (!f)
1177 return -errno;
1178
1179 while (!feof(f)) {
1180 char line[LINE_MAX], *l;
1181
1182 if (!fgets(line, sizeof(line), f)) {
1183 if (feof(f))
1184 break;
1185
1186 r = -errno;
1187 goto finish;
1188 }
1189
1190 l = strstrip(line);
1191
1192 if (startswith(l, "Uid:")) {
1193 l += 4;
1194 l += strspn(l, WHITESPACE);
1195
1196 l[strcspn(l, WHITESPACE)] = 0;
1197
1198 r = parse_uid(l, uid);
1199 goto finish;
1200 }
1201 }
1202
1203 r = -EIO;
1204
1205 finish:
1206 fclose(f);
1207
1208 return r;
1209 }
1210
1211 char *strnappend(const char *s, const char *suffix, size_t b) {
1212 size_t a;
1213 char *r;
1214
1215 if (!s && !suffix)
1216 return strdup("");
1217
1218 if (!s)
1219 return strndup(suffix, b);
1220
1221 if (!suffix)
1222 return strdup(s);
1223
1224 assert(s);
1225 assert(suffix);
1226
1227 a = strlen(s);
1228
1229 if (!(r = new(char, a+b+1)))
1230 return NULL;
1231
1232 memcpy(r, s, a);
1233 memcpy(r+a, suffix, b);
1234 r[a+b] = 0;
1235
1236 return r;
1237 }
1238
1239 char *strappend(const char *s, const char *suffix) {
1240 return strnappend(s, suffix, suffix ? strlen(suffix) : 0);
1241 }
1242
1243 int readlink_malloc(const char *p, char **r) {
1244 size_t l = 100;
1245
1246 assert(p);
1247 assert(r);
1248
1249 for (;;) {
1250 char *c;
1251 ssize_t n;
1252
1253 if (!(c = new(char, l)))
1254 return -ENOMEM;
1255
1256 if ((n = readlink(p, c, l-1)) < 0) {
1257 int ret = -errno;
1258 free(c);
1259 return ret;
1260 }
1261
1262 if ((size_t) n < l-1) {
1263 c[n] = 0;
1264 *r = c;
1265 return 0;
1266 }
1267
1268 free(c);
1269 l *= 2;
1270 }
1271 }
1272
1273 int readlink_and_make_absolute(const char *p, char **r) {
1274 char *target, *k;
1275 int j;
1276
1277 assert(p);
1278 assert(r);
1279
1280 if ((j = readlink_malloc(p, &target)) < 0)
1281 return j;
1282
1283 k = file_in_same_dir(p, target);
1284 free(target);
1285
1286 if (!k)
1287 return -ENOMEM;
1288
1289 *r = k;
1290 return 0;
1291 }
1292
1293 int readlink_and_canonicalize(const char *p, char **r) {
1294 char *t, *s;
1295 int j;
1296
1297 assert(p);
1298 assert(r);
1299
1300 j = readlink_and_make_absolute(p, &t);
1301 if (j < 0)
1302 return j;
1303
1304 s = canonicalize_file_name(t);
1305 if (s) {
1306 free(t);
1307 *r = s;
1308 } else
1309 *r = t;
1310
1311 path_kill_slashes(*r);
1312
1313 return 0;
1314 }
1315
1316 int parent_of_path(const char *path, char **_r) {
1317 const char *e, *a = NULL, *b = NULL, *p;
1318 char *r;
1319 bool slash = false;
1320
1321 assert(path);
1322 assert(_r);
1323
1324 if (!*path)
1325 return -EINVAL;
1326
1327 for (e = path; *e; e++) {
1328
1329 if (!slash && *e == '/') {
1330 a = b;
1331 b = e;
1332 slash = true;
1333 } else if (slash && *e != '/')
1334 slash = false;
1335 }
1336
1337 if (*(e-1) == '/')
1338 p = a;
1339 else
1340 p = b;
1341
1342 if (!p)
1343 return -EINVAL;
1344
1345 if (p == path)
1346 r = strdup("/");
1347 else
1348 r = strndup(path, p-path);
1349
1350 if (!r)
1351 return -ENOMEM;
1352
1353 *_r = r;
1354 return 0;
1355 }
1356
1357
1358 char *file_name_from_path(const char *p) {
1359 char *r;
1360
1361 assert(p);
1362
1363 if ((r = strrchr(p, '/')))
1364 return r + 1;
1365
1366 return (char*) p;
1367 }
1368
1369 bool path_is_absolute(const char *p) {
1370 assert(p);
1371
1372 return p[0] == '/';
1373 }
1374
1375 bool is_path(const char *p) {
1376
1377 return !!strchr(p, '/');
1378 }
1379
1380 char *path_make_absolute(const char *p, const char *prefix) {
1381 assert(p);
1382
1383 /* Makes every item in the list an absolute path by prepending
1384 * the prefix, if specified and necessary */
1385
1386 if (path_is_absolute(p) || !prefix)
1387 return strdup(p);
1388
1389 return join(prefix, "/", p, NULL);
1390 }
1391
1392 char *path_make_absolute_cwd(const char *p) {
1393 char *cwd, *r;
1394
1395 assert(p);
1396
1397 /* Similar to path_make_absolute(), but prefixes with the
1398 * current working directory. */
1399
1400 if (path_is_absolute(p))
1401 return strdup(p);
1402
1403 if (!(cwd = get_current_dir_name()))
1404 return NULL;
1405
1406 r = path_make_absolute(p, cwd);
1407 free(cwd);
1408
1409 return r;
1410 }
1411
1412 char **strv_path_make_absolute_cwd(char **l) {
1413 char **s;
1414
1415 /* Goes through every item in the string list and makes it
1416 * absolute. This works in place and won't rollback any
1417 * changes on failure. */
1418
1419 STRV_FOREACH(s, l) {
1420 char *t;
1421
1422 if (!(t = path_make_absolute_cwd(*s)))
1423 return NULL;
1424
1425 free(*s);
1426 *s = t;
1427 }
1428
1429 return l;
1430 }
1431
1432 char **strv_path_canonicalize(char **l) {
1433 char **s;
1434 unsigned k = 0;
1435 bool enomem = false;
1436
1437 if (strv_isempty(l))
1438 return l;
1439
1440 /* Goes through every item in the string list and canonicalize
1441 * the path. This works in place and won't rollback any
1442 * changes on failure. */
1443
1444 STRV_FOREACH(s, l) {
1445 char *t, *u;
1446
1447 t = path_make_absolute_cwd(*s);
1448 free(*s);
1449
1450 if (!t) {
1451 enomem = true;
1452 continue;
1453 }
1454
1455 errno = 0;
1456 u = canonicalize_file_name(t);
1457 free(t);
1458
1459 if (!u) {
1460 if (errno == ENOMEM || !errno)
1461 enomem = true;
1462
1463 continue;
1464 }
1465
1466 l[k++] = u;
1467 }
1468
1469 l[k] = NULL;
1470
1471 if (enomem)
1472 return NULL;
1473
1474 return l;
1475 }
1476
1477 char **strv_path_remove_empty(char **l) {
1478 char **f, **t;
1479
1480 if (!l)
1481 return NULL;
1482
1483 for (f = t = l; *f; f++) {
1484
1485 if (dir_is_empty(*f) > 0) {
1486 free(*f);
1487 continue;
1488 }
1489
1490 *(t++) = *f;
1491 }
1492
1493 *t = NULL;
1494 return l;
1495 }
1496
1497 int reset_all_signal_handlers(void) {
1498 int sig;
1499
1500 for (sig = 1; sig < _NSIG; sig++) {
1501 struct sigaction sa;
1502
1503 if (sig == SIGKILL || sig == SIGSTOP)
1504 continue;
1505
1506 zero(sa);
1507 sa.sa_handler = SIG_DFL;
1508 sa.sa_flags = SA_RESTART;
1509
1510 /* On Linux the first two RT signals are reserved by
1511 * glibc, and sigaction() will return EINVAL for them. */
1512 if ((sigaction(sig, &sa, NULL) < 0))
1513 if (errno != EINVAL)
1514 return -errno;
1515 }
1516
1517 return 0;
1518 }
1519
1520 char *strstrip(char *s) {
1521 char *e;
1522
1523 /* Drops trailing whitespace. Modifies the string in
1524 * place. Returns pointer to first non-space character */
1525
1526 s += strspn(s, WHITESPACE);
1527
1528 for (e = strchr(s, 0); e > s; e --)
1529 if (!strchr(WHITESPACE, e[-1]))
1530 break;
1531
1532 *e = 0;
1533
1534 return s;
1535 }
1536
1537 char *delete_chars(char *s, const char *bad) {
1538 char *f, *t;
1539
1540 /* Drops all whitespace, regardless where in the string */
1541
1542 for (f = s, t = s; *f; f++) {
1543 if (strchr(bad, *f))
1544 continue;
1545
1546 *(t++) = *f;
1547 }
1548
1549 *t = 0;
1550
1551 return s;
1552 }
1553
1554 bool in_charset(const char *s, const char* charset) {
1555 const char *i;
1556
1557 assert(s);
1558 assert(charset);
1559
1560 for (i = s; *i; i++)
1561 if (!strchr(charset, *i))
1562 return false;
1563
1564 return true;
1565 }
1566
1567 char *file_in_same_dir(const char *path, const char *filename) {
1568 char *e, *r;
1569 size_t k;
1570
1571 assert(path);
1572 assert(filename);
1573
1574 /* This removes the last component of path and appends
1575 * filename, unless the latter is absolute anyway or the
1576 * former isn't */
1577
1578 if (path_is_absolute(filename))
1579 return strdup(filename);
1580
1581 if (!(e = strrchr(path, '/')))
1582 return strdup(filename);
1583
1584 k = strlen(filename);
1585 if (!(r = new(char, e-path+1+k+1)))
1586 return NULL;
1587
1588 memcpy(r, path, e-path+1);
1589 memcpy(r+(e-path)+1, filename, k+1);
1590
1591 return r;
1592 }
1593
1594 int safe_mkdir(const char *path, mode_t mode, uid_t uid, gid_t gid) {
1595 struct stat st;
1596
1597 if (label_mkdir(path, mode) >= 0)
1598 if (chmod_and_chown(path, mode, uid, gid) < 0)
1599 return -errno;
1600
1601 if (lstat(path, &st) < 0)
1602 return -errno;
1603
1604 if ((st.st_mode & 0777) != mode ||
1605 st.st_uid != uid ||
1606 st.st_gid != gid ||
1607 !S_ISDIR(st.st_mode)) {
1608 errno = EEXIST;
1609 return -errno;
1610 }
1611
1612 return 0;
1613 }
1614
1615
1616 int mkdir_parents(const char *path, mode_t mode) {
1617 const char *p, *e;
1618
1619 assert(path);
1620
1621 /* Creates every parent directory in the path except the last
1622 * component. */
1623
1624 p = path + strspn(path, "/");
1625 for (;;) {
1626 int r;
1627 char *t;
1628
1629 e = p + strcspn(p, "/");
1630 p = e + strspn(e, "/");
1631
1632 /* Is this the last component? If so, then we're
1633 * done */
1634 if (*p == 0)
1635 return 0;
1636
1637 if (!(t = strndup(path, e - path)))
1638 return -ENOMEM;
1639
1640 r = label_mkdir(t, mode);
1641 free(t);
1642
1643 if (r < 0 && errno != EEXIST)
1644 return -errno;
1645 }
1646 }
1647
1648 int mkdir_p(const char *path, mode_t mode) {
1649 int r;
1650
1651 /* Like mkdir -p */
1652
1653 if ((r = mkdir_parents(path, mode)) < 0)
1654 return r;
1655
1656 if (label_mkdir(path, mode) < 0 && errno != EEXIST)
1657 return -errno;
1658
1659 return 0;
1660 }
1661
1662 int rmdir_parents(const char *path, const char *stop) {
1663 size_t l;
1664 int r = 0;
1665
1666 assert(path);
1667 assert(stop);
1668
1669 l = strlen(path);
1670
1671 /* Skip trailing slashes */
1672 while (l > 0 && path[l-1] == '/')
1673 l--;
1674
1675 while (l > 0) {
1676 char *t;
1677
1678 /* Skip last component */
1679 while (l > 0 && path[l-1] != '/')
1680 l--;
1681
1682 /* Skip trailing slashes */
1683 while (l > 0 && path[l-1] == '/')
1684 l--;
1685
1686 if (l <= 0)
1687 break;
1688
1689 if (!(t = strndup(path, l)))
1690 return -ENOMEM;
1691
1692 if (path_startswith(stop, t)) {
1693 free(t);
1694 return 0;
1695 }
1696
1697 r = rmdir(t);
1698 free(t);
1699
1700 if (r < 0)
1701 if (errno != ENOENT)
1702 return -errno;
1703 }
1704
1705 return 0;
1706 }
1707
1708
1709 char hexchar(int x) {
1710 static const char table[16] = "0123456789abcdef";
1711
1712 return table[x & 15];
1713 }
1714
1715 int unhexchar(char c) {
1716
1717 if (c >= '0' && c <= '9')
1718 return c - '0';
1719
1720 if (c >= 'a' && c <= 'f')
1721 return c - 'a' + 10;
1722
1723 if (c >= 'A' && c <= 'F')
1724 return c - 'A' + 10;
1725
1726 return -1;
1727 }
1728
1729 char octchar(int x) {
1730 return '0' + (x & 7);
1731 }
1732
1733 int unoctchar(char c) {
1734
1735 if (c >= '0' && c <= '7')
1736 return c - '0';
1737
1738 return -1;
1739 }
1740
1741 char decchar(int x) {
1742 return '0' + (x % 10);
1743 }
1744
1745 int undecchar(char c) {
1746
1747 if (c >= '0' && c <= '9')
1748 return c - '0';
1749
1750 return -1;
1751 }
1752
1753 char *cescape(const char *s) {
1754 char *r, *t;
1755 const char *f;
1756
1757 assert(s);
1758
1759 /* Does C style string escaping. */
1760
1761 if (!(r = new(char, strlen(s)*4 + 1)))
1762 return NULL;
1763
1764 for (f = s, t = r; *f; f++)
1765
1766 switch (*f) {
1767
1768 case '\a':
1769 *(t++) = '\\';
1770 *(t++) = 'a';
1771 break;
1772 case '\b':
1773 *(t++) = '\\';
1774 *(t++) = 'b';
1775 break;
1776 case '\f':
1777 *(t++) = '\\';
1778 *(t++) = 'f';
1779 break;
1780 case '\n':
1781 *(t++) = '\\';
1782 *(t++) = 'n';
1783 break;
1784 case '\r':
1785 *(t++) = '\\';
1786 *(t++) = 'r';
1787 break;
1788 case '\t':
1789 *(t++) = '\\';
1790 *(t++) = 't';
1791 break;
1792 case '\v':
1793 *(t++) = '\\';
1794 *(t++) = 'v';
1795 break;
1796 case '\\':
1797 *(t++) = '\\';
1798 *(t++) = '\\';
1799 break;
1800 case '"':
1801 *(t++) = '\\';
1802 *(t++) = '"';
1803 break;
1804 case '\'':
1805 *(t++) = '\\';
1806 *(t++) = '\'';
1807 break;
1808
1809 default:
1810 /* For special chars we prefer octal over
1811 * hexadecimal encoding, simply because glib's
1812 * g_strescape() does the same */
1813 if ((*f < ' ') || (*f >= 127)) {
1814 *(t++) = '\\';
1815 *(t++) = octchar((unsigned char) *f >> 6);
1816 *(t++) = octchar((unsigned char) *f >> 3);
1817 *(t++) = octchar((unsigned char) *f);
1818 } else
1819 *(t++) = *f;
1820 break;
1821 }
1822
1823 *t = 0;
1824
1825 return r;
1826 }
1827
1828 char *cunescape_length(const char *s, size_t length) {
1829 char *r, *t;
1830 const char *f;
1831
1832 assert(s);
1833
1834 /* Undoes C style string escaping */
1835
1836 if (!(r = new(char, length+1)))
1837 return r;
1838
1839 for (f = s, t = r; f < s + length; f++) {
1840
1841 if (*f != '\\') {
1842 *(t++) = *f;
1843 continue;
1844 }
1845
1846 f++;
1847
1848 switch (*f) {
1849
1850 case 'a':
1851 *(t++) = '\a';
1852 break;
1853 case 'b':
1854 *(t++) = '\b';
1855 break;
1856 case 'f':
1857 *(t++) = '\f';
1858 break;
1859 case 'n':
1860 *(t++) = '\n';
1861 break;
1862 case 'r':
1863 *(t++) = '\r';
1864 break;
1865 case 't':
1866 *(t++) = '\t';
1867 break;
1868 case 'v':
1869 *(t++) = '\v';
1870 break;
1871 case '\\':
1872 *(t++) = '\\';
1873 break;
1874 case '"':
1875 *(t++) = '"';
1876 break;
1877 case '\'':
1878 *(t++) = '\'';
1879 break;
1880
1881 case 's':
1882 /* This is an extension of the XDG syntax files */
1883 *(t++) = ' ';
1884 break;
1885
1886 case 'x': {
1887 /* hexadecimal encoding */
1888 int a, b;
1889
1890 if ((a = unhexchar(f[1])) < 0 ||
1891 (b = unhexchar(f[2])) < 0) {
1892 /* Invalid escape code, let's take it literal then */
1893 *(t++) = '\\';
1894 *(t++) = 'x';
1895 } else {
1896 *(t++) = (char) ((a << 4) | b);
1897 f += 2;
1898 }
1899
1900 break;
1901 }
1902
1903 case '0':
1904 case '1':
1905 case '2':
1906 case '3':
1907 case '4':
1908 case '5':
1909 case '6':
1910 case '7': {
1911 /* octal encoding */
1912 int a, b, c;
1913
1914 if ((a = unoctchar(f[0])) < 0 ||
1915 (b = unoctchar(f[1])) < 0 ||
1916 (c = unoctchar(f[2])) < 0) {
1917 /* Invalid escape code, let's take it literal then */
1918 *(t++) = '\\';
1919 *(t++) = f[0];
1920 } else {
1921 *(t++) = (char) ((a << 6) | (b << 3) | c);
1922 f += 2;
1923 }
1924
1925 break;
1926 }
1927
1928 case 0:
1929 /* premature end of string.*/
1930 *(t++) = '\\';
1931 goto finish;
1932
1933 default:
1934 /* Invalid escape code, let's take it literal then */
1935 *(t++) = '\\';
1936 *(t++) = *f;
1937 break;
1938 }
1939 }
1940
1941 finish:
1942 *t = 0;
1943 return r;
1944 }
1945
1946 char *cunescape(const char *s) {
1947 return cunescape_length(s, strlen(s));
1948 }
1949
1950 char *xescape(const char *s, const char *bad) {
1951 char *r, *t;
1952 const char *f;
1953
1954 /* Escapes all chars in bad, in addition to \ and all special
1955 * chars, in \xFF style escaping. May be reversed with
1956 * cunescape. */
1957
1958 if (!(r = new(char, strlen(s)*4+1)))
1959 return NULL;
1960
1961 for (f = s, t = r; *f; f++) {
1962
1963 if ((*f < ' ') || (*f >= 127) ||
1964 (*f == '\\') || strchr(bad, *f)) {
1965 *(t++) = '\\';
1966 *(t++) = 'x';
1967 *(t++) = hexchar(*f >> 4);
1968 *(t++) = hexchar(*f);
1969 } else
1970 *(t++) = *f;
1971 }
1972
1973 *t = 0;
1974
1975 return r;
1976 }
1977
1978 char *bus_path_escape(const char *s) {
1979 char *r, *t;
1980 const char *f;
1981
1982 assert(s);
1983
1984 /* Escapes all chars that D-Bus' object path cannot deal
1985 * with. Can be reverse with bus_path_unescape() */
1986
1987 if (!(r = new(char, strlen(s)*3+1)))
1988 return NULL;
1989
1990 for (f = s, t = r; *f; f++) {
1991
1992 if (!(*f >= 'A' && *f <= 'Z') &&
1993 !(*f >= 'a' && *f <= 'z') &&
1994 !(*f >= '0' && *f <= '9')) {
1995 *(t++) = '_';
1996 *(t++) = hexchar(*f >> 4);
1997 *(t++) = hexchar(*f);
1998 } else
1999 *(t++) = *f;
2000 }
2001
2002 *t = 0;
2003
2004 return r;
2005 }
2006
2007 char *bus_path_unescape(const char *f) {
2008 char *r, *t;
2009
2010 assert(f);
2011
2012 if (!(r = strdup(f)))
2013 return NULL;
2014
2015 for (t = r; *f; f++) {
2016
2017 if (*f == '_') {
2018 int a, b;
2019
2020 if ((a = unhexchar(f[1])) < 0 ||
2021 (b = unhexchar(f[2])) < 0) {
2022 /* Invalid escape code, let's take it literal then */
2023 *(t++) = '_';
2024 } else {
2025 *(t++) = (char) ((a << 4) | b);
2026 f += 2;
2027 }
2028 } else
2029 *(t++) = *f;
2030 }
2031
2032 *t = 0;
2033
2034 return r;
2035 }
2036
2037 char *path_kill_slashes(char *path) {
2038 char *f, *t;
2039 bool slash = false;
2040
2041 /* Removes redundant inner and trailing slashes. Modifies the
2042 * passed string in-place.
2043 *
2044 * ///foo///bar/ becomes /foo/bar
2045 */
2046
2047 for (f = path, t = path; *f; f++) {
2048
2049 if (*f == '/') {
2050 slash = true;
2051 continue;
2052 }
2053
2054 if (slash) {
2055 slash = false;
2056 *(t++) = '/';
2057 }
2058
2059 *(t++) = *f;
2060 }
2061
2062 /* Special rule, if we are talking of the root directory, a
2063 trailing slash is good */
2064
2065 if (t == path && slash)
2066 *(t++) = '/';
2067
2068 *t = 0;
2069 return path;
2070 }
2071
2072 bool path_startswith(const char *path, const char *prefix) {
2073 assert(path);
2074 assert(prefix);
2075
2076 if ((path[0] == '/') != (prefix[0] == '/'))
2077 return false;
2078
2079 for (;;) {
2080 size_t a, b;
2081
2082 path += strspn(path, "/");
2083 prefix += strspn(prefix, "/");
2084
2085 if (*prefix == 0)
2086 return true;
2087
2088 if (*path == 0)
2089 return false;
2090
2091 a = strcspn(path, "/");
2092 b = strcspn(prefix, "/");
2093
2094 if (a != b)
2095 return false;
2096
2097 if (memcmp(path, prefix, a) != 0)
2098 return false;
2099
2100 path += a;
2101 prefix += b;
2102 }
2103 }
2104
2105 bool path_equal(const char *a, const char *b) {
2106 assert(a);
2107 assert(b);
2108
2109 if ((a[0] == '/') != (b[0] == '/'))
2110 return false;
2111
2112 for (;;) {
2113 size_t j, k;
2114
2115 a += strspn(a, "/");
2116 b += strspn(b, "/");
2117
2118 if (*a == 0 && *b == 0)
2119 return true;
2120
2121 if (*a == 0 || *b == 0)
2122 return false;
2123
2124 j = strcspn(a, "/");
2125 k = strcspn(b, "/");
2126
2127 if (j != k)
2128 return false;
2129
2130 if (memcmp(a, b, j) != 0)
2131 return false;
2132
2133 a += j;
2134 b += k;
2135 }
2136 }
2137
2138 char *ascii_strlower(char *t) {
2139 char *p;
2140
2141 assert(t);
2142
2143 for (p = t; *p; p++)
2144 if (*p >= 'A' && *p <= 'Z')
2145 *p = *p - 'A' + 'a';
2146
2147 return t;
2148 }
2149
2150 bool ignore_file(const char *filename) {
2151 assert(filename);
2152
2153 return
2154 filename[0] == '.' ||
2155 streq(filename, "lost+found") ||
2156 streq(filename, "aquota.user") ||
2157 streq(filename, "aquota.group") ||
2158 endswith(filename, "~") ||
2159 endswith(filename, ".rpmnew") ||
2160 endswith(filename, ".rpmsave") ||
2161 endswith(filename, ".rpmorig") ||
2162 endswith(filename, ".dpkg-old") ||
2163 endswith(filename, ".dpkg-new") ||
2164 endswith(filename, ".swp");
2165 }
2166
2167 int fd_nonblock(int fd, bool nonblock) {
2168 int flags;
2169
2170 assert(fd >= 0);
2171
2172 if ((flags = fcntl(fd, F_GETFL, 0)) < 0)
2173 return -errno;
2174
2175 if (nonblock)
2176 flags |= O_NONBLOCK;
2177 else
2178 flags &= ~O_NONBLOCK;
2179
2180 if (fcntl(fd, F_SETFL, flags) < 0)
2181 return -errno;
2182
2183 return 0;
2184 }
2185
2186 int fd_cloexec(int fd, bool cloexec) {
2187 int flags;
2188
2189 assert(fd >= 0);
2190
2191 if ((flags = fcntl(fd, F_GETFD, 0)) < 0)
2192 return -errno;
2193
2194 if (cloexec)
2195 flags |= FD_CLOEXEC;
2196 else
2197 flags &= ~FD_CLOEXEC;
2198
2199 if (fcntl(fd, F_SETFD, flags) < 0)
2200 return -errno;
2201
2202 return 0;
2203 }
2204
2205 int close_all_fds(const int except[], unsigned n_except) {
2206 DIR *d;
2207 struct dirent *de;
2208 int r = 0;
2209
2210 if (!(d = opendir("/proc/self/fd")))
2211 return -errno;
2212
2213 while ((de = readdir(d))) {
2214 int fd = -1;
2215
2216 if (ignore_file(de->d_name))
2217 continue;
2218
2219 if (safe_atoi(de->d_name, &fd) < 0)
2220 /* Let's better ignore this, just in case */
2221 continue;
2222
2223 if (fd < 3)
2224 continue;
2225
2226 if (fd == dirfd(d))
2227 continue;
2228
2229 if (except) {
2230 bool found;
2231 unsigned i;
2232
2233 found = false;
2234 for (i = 0; i < n_except; i++)
2235 if (except[i] == fd) {
2236 found = true;
2237 break;
2238 }
2239
2240 if (found)
2241 continue;
2242 }
2243
2244 if (close_nointr(fd) < 0) {
2245 /* Valgrind has its own FD and doesn't want to have it closed */
2246 if (errno != EBADF && r == 0)
2247 r = -errno;
2248 }
2249 }
2250
2251 closedir(d);
2252 return r;
2253 }
2254
2255 bool chars_intersect(const char *a, const char *b) {
2256 const char *p;
2257
2258 /* Returns true if any of the chars in a are in b. */
2259 for (p = a; *p; p++)
2260 if (strchr(b, *p))
2261 return true;
2262
2263 return false;
2264 }
2265
2266 char *format_timestamp(char *buf, size_t l, usec_t t) {
2267 struct tm tm;
2268 time_t sec;
2269
2270 assert(buf);
2271 assert(l > 0);
2272
2273 if (t <= 0)
2274 return NULL;
2275
2276 sec = (time_t) (t / USEC_PER_SEC);
2277
2278 if (strftime(buf, l, "%a, %d %b %Y %H:%M:%S %z", localtime_r(&sec, &tm)) <= 0)
2279 return NULL;
2280
2281 return buf;
2282 }
2283
2284 char *format_timestamp_pretty(char *buf, size_t l, usec_t t) {
2285 usec_t n, d;
2286
2287 n = now(CLOCK_REALTIME);
2288
2289 if (t <= 0 || t > n || t + USEC_PER_DAY*7 <= t)
2290 return NULL;
2291
2292 d = n - t;
2293
2294 if (d >= USEC_PER_YEAR)
2295 snprintf(buf, l, "%llu years and %llu months ago",
2296 (unsigned long long) (d / USEC_PER_YEAR),
2297 (unsigned long long) ((d % USEC_PER_YEAR) / USEC_PER_MONTH));
2298 else if (d >= USEC_PER_MONTH)
2299 snprintf(buf, l, "%llu months and %llu days ago",
2300 (unsigned long long) (d / USEC_PER_MONTH),
2301 (unsigned long long) ((d % USEC_PER_MONTH) / USEC_PER_DAY));
2302 else if (d >= USEC_PER_WEEK)
2303 snprintf(buf, l, "%llu weeks and %llu days ago",
2304 (unsigned long long) (d / USEC_PER_WEEK),
2305 (unsigned long long) ((d % USEC_PER_WEEK) / USEC_PER_DAY));
2306 else if (d >= 2*USEC_PER_DAY)
2307 snprintf(buf, l, "%llu days ago", (unsigned long long) (d / USEC_PER_DAY));
2308 else if (d >= 25*USEC_PER_HOUR)
2309 snprintf(buf, l, "1 day and %lluh ago",
2310 (unsigned long long) ((d - USEC_PER_DAY) / USEC_PER_HOUR));
2311 else if (d >= 6*USEC_PER_HOUR)
2312 snprintf(buf, l, "%lluh ago",
2313 (unsigned long long) (d / USEC_PER_HOUR));
2314 else if (d >= USEC_PER_HOUR)
2315 snprintf(buf, l, "%lluh %llumin ago",
2316 (unsigned long long) (d / USEC_PER_HOUR),
2317 (unsigned long long) ((d % USEC_PER_HOUR) / USEC_PER_MINUTE));
2318 else if (d >= 5*USEC_PER_MINUTE)
2319 snprintf(buf, l, "%llumin ago",
2320 (unsigned long long) (d / USEC_PER_MINUTE));
2321 else if (d >= USEC_PER_MINUTE)
2322 snprintf(buf, l, "%llumin %llus ago",
2323 (unsigned long long) (d / USEC_PER_MINUTE),
2324 (unsigned long long) ((d % USEC_PER_MINUTE) / USEC_PER_SEC));
2325 else if (d >= USEC_PER_SEC)
2326 snprintf(buf, l, "%llus ago",
2327 (unsigned long long) (d / USEC_PER_SEC));
2328 else if (d >= USEC_PER_MSEC)
2329 snprintf(buf, l, "%llums ago",
2330 (unsigned long long) (d / USEC_PER_MSEC));
2331 else if (d > 0)
2332 snprintf(buf, l, "%lluus ago",
2333 (unsigned long long) d);
2334 else
2335 snprintf(buf, l, "now");
2336
2337 buf[l-1] = 0;
2338 return buf;
2339 }
2340
2341 char *format_timespan(char *buf, size_t l, usec_t t) {
2342 static const struct {
2343 const char *suffix;
2344 usec_t usec;
2345 } table[] = {
2346 { "w", USEC_PER_WEEK },
2347 { "d", USEC_PER_DAY },
2348 { "h", USEC_PER_HOUR },
2349 { "min", USEC_PER_MINUTE },
2350 { "s", USEC_PER_SEC },
2351 { "ms", USEC_PER_MSEC },
2352 { "us", 1 },
2353 };
2354
2355 unsigned i;
2356 char *p = buf;
2357
2358 assert(buf);
2359 assert(l > 0);
2360
2361 if (t == (usec_t) -1)
2362 return NULL;
2363
2364 if (t == 0) {
2365 snprintf(p, l, "0");
2366 p[l-1] = 0;
2367 return p;
2368 }
2369
2370 /* The result of this function can be parsed with parse_usec */
2371
2372 for (i = 0; i < ELEMENTSOF(table); i++) {
2373 int k;
2374 size_t n;
2375
2376 if (t < table[i].usec)
2377 continue;
2378
2379 if (l <= 1)
2380 break;
2381
2382 k = snprintf(p, l, "%s%llu%s", p > buf ? " " : "", (unsigned long long) (t / table[i].usec), table[i].suffix);
2383 n = MIN((size_t) k, l);
2384
2385 l -= n;
2386 p += n;
2387
2388 t %= table[i].usec;
2389 }
2390
2391 *p = 0;
2392
2393 return buf;
2394 }
2395
2396 bool fstype_is_network(const char *fstype) {
2397 static const char * const table[] = {
2398 "cifs",
2399 "smbfs",
2400 "ncpfs",
2401 "nfs",
2402 "nfs4",
2403 "gfs",
2404 "gfs2"
2405 };
2406
2407 unsigned i;
2408
2409 for (i = 0; i < ELEMENTSOF(table); i++)
2410 if (streq(table[i], fstype))
2411 return true;
2412
2413 return false;
2414 }
2415
2416 int chvt(int vt) {
2417 int fd, r = 0;
2418
2419 if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0)
2420 return -errno;
2421
2422 if (vt < 0) {
2423 int tiocl[2] = {
2424 TIOCL_GETKMSGREDIRECT,
2425 0
2426 };
2427
2428 if (ioctl(fd, TIOCLINUX, tiocl) < 0) {
2429 r = -errno;
2430 goto fail;
2431 }
2432
2433 vt = tiocl[0] <= 0 ? 1 : tiocl[0];
2434 }
2435
2436 if (ioctl(fd, VT_ACTIVATE, vt) < 0)
2437 r = -errno;
2438
2439 fail:
2440 close_nointr_nofail(fd);
2441 return r;
2442 }
2443
2444 int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) {
2445 struct termios old_termios, new_termios;
2446 char c;
2447 char line[LINE_MAX];
2448
2449 assert(f);
2450 assert(ret);
2451
2452 if (tcgetattr(fileno(f), &old_termios) >= 0) {
2453 new_termios = old_termios;
2454
2455 new_termios.c_lflag &= ~ICANON;
2456 new_termios.c_cc[VMIN] = 1;
2457 new_termios.c_cc[VTIME] = 0;
2458
2459 if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
2460 size_t k;
2461
2462 if (t != (usec_t) -1) {
2463 if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) {
2464 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
2465 return -ETIMEDOUT;
2466 }
2467 }
2468
2469 k = fread(&c, 1, 1, f);
2470
2471 tcsetattr(fileno(f), TCSADRAIN, &old_termios);
2472
2473 if (k <= 0)
2474 return -EIO;
2475
2476 if (need_nl)
2477 *need_nl = c != '\n';
2478
2479 *ret = c;
2480 return 0;
2481 }
2482 }
2483
2484 if (t != (usec_t) -1)
2485 if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0)
2486 return -ETIMEDOUT;
2487
2488 if (!fgets(line, sizeof(line), f))
2489 return -EIO;
2490
2491 truncate_nl(line);
2492
2493 if (strlen(line) != 1)
2494 return -EBADMSG;
2495
2496 if (need_nl)
2497 *need_nl = false;
2498
2499 *ret = line[0];
2500 return 0;
2501 }
2502
2503 int ask(char *ret, const char *replies, const char *text, ...) {
2504 bool on_tty;
2505
2506 assert(ret);
2507 assert(replies);
2508 assert(text);
2509
2510 on_tty = isatty(STDOUT_FILENO);
2511
2512 for (;;) {
2513 va_list ap;
2514 char c;
2515 int r;
2516 bool need_nl = true;
2517
2518 if (on_tty)
2519 fputs(ANSI_HIGHLIGHT_ON, stdout);
2520
2521 va_start(ap, text);
2522 vprintf(text, ap);
2523 va_end(ap);
2524
2525 if (on_tty)
2526 fputs(ANSI_HIGHLIGHT_OFF, stdout);
2527
2528 fflush(stdout);
2529
2530 r = read_one_char(stdin, &c, (usec_t) -1, &need_nl);
2531 if (r < 0) {
2532
2533 if (r == -EBADMSG) {
2534 puts("Bad input, please try again.");
2535 continue;
2536 }
2537
2538 putchar('\n');
2539 return r;
2540 }
2541
2542 if (need_nl)
2543 putchar('\n');
2544
2545 if (strchr(replies, c)) {
2546 *ret = c;
2547 return 0;
2548 }
2549
2550 puts("Read unexpected character, please try again.");
2551 }
2552 }
2553
2554 int reset_terminal_fd(int fd, bool switch_to_text) {
2555 struct termios termios;
2556 int r = 0;
2557
2558 /* Set terminal to some sane defaults */
2559
2560 assert(fd >= 0);
2561
2562 /* We leave locked terminal attributes untouched, so that
2563 * Plymouth may set whatever it wants to set, and we don't
2564 * interfere with that. */
2565
2566 /* Disable exclusive mode, just in case */
2567 ioctl(fd, TIOCNXCL);
2568
2569 /* Switch to text mode */
2570 if (switch_to_text)
2571 ioctl(fd, KDSETMODE, KD_TEXT);
2572
2573 /* Enable console unicode mode */
2574 ioctl(fd, KDSKBMODE, K_UNICODE);
2575
2576 if (tcgetattr(fd, &termios) < 0) {
2577 r = -errno;
2578 goto finish;
2579 }
2580
2581 /* We only reset the stuff that matters to the software. How
2582 * hardware is set up we don't touch assuming that somebody
2583 * else will do that for us */
2584
2585 termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
2586 termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
2587 termios.c_oflag |= ONLCR;
2588 termios.c_cflag |= CREAD;
2589 termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
2590
2591 termios.c_cc[VINTR] = 03; /* ^C */
2592 termios.c_cc[VQUIT] = 034; /* ^\ */
2593 termios.c_cc[VERASE] = 0177;
2594 termios.c_cc[VKILL] = 025; /* ^X */
2595 termios.c_cc[VEOF] = 04; /* ^D */
2596 termios.c_cc[VSTART] = 021; /* ^Q */
2597 termios.c_cc[VSTOP] = 023; /* ^S */
2598 termios.c_cc[VSUSP] = 032; /* ^Z */
2599 termios.c_cc[VLNEXT] = 026; /* ^V */
2600 termios.c_cc[VWERASE] = 027; /* ^W */
2601 termios.c_cc[VREPRINT] = 022; /* ^R */
2602 termios.c_cc[VEOL] = 0;
2603 termios.c_cc[VEOL2] = 0;
2604
2605 termios.c_cc[VTIME] = 0;
2606 termios.c_cc[VMIN] = 1;
2607
2608 if (tcsetattr(fd, TCSANOW, &termios) < 0)
2609 r = -errno;
2610
2611 finish:
2612 /* Just in case, flush all crap out */
2613 tcflush(fd, TCIOFLUSH);
2614
2615 return r;
2616 }
2617
2618 int reset_terminal(const char *name) {
2619 int fd, r;
2620
2621 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
2622 if (fd < 0)
2623 return fd;
2624
2625 r = reset_terminal_fd(fd, true);
2626 close_nointr_nofail(fd);
2627
2628 return r;
2629 }
2630
2631 int open_terminal(const char *name, int mode) {
2632 int fd, r;
2633 unsigned c = 0;
2634
2635 /*
2636 * If a TTY is in the process of being closed opening it might
2637 * cause EIO. This is horribly awful, but unlikely to be
2638 * changed in the kernel. Hence we work around this problem by
2639 * retrying a couple of times.
2640 *
2641 * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
2642 */
2643
2644 for (;;) {
2645 if ((fd = open(name, mode)) >= 0)
2646 break;
2647
2648 if (errno != EIO)
2649 return -errno;
2650
2651 if (c >= 20)
2652 return -errno;
2653
2654 usleep(50 * USEC_PER_MSEC);
2655 c++;
2656 }
2657
2658 if (fd < 0)
2659 return -errno;
2660
2661 if ((r = isatty(fd)) < 0) {
2662 close_nointr_nofail(fd);
2663 return -errno;
2664 }
2665
2666 if (!r) {
2667 close_nointr_nofail(fd);
2668 return -ENOTTY;
2669 }
2670
2671 return fd;
2672 }
2673
2674 int flush_fd(int fd) {
2675 struct pollfd pollfd;
2676
2677 zero(pollfd);
2678 pollfd.fd = fd;
2679 pollfd.events = POLLIN;
2680
2681 for (;;) {
2682 char buf[LINE_MAX];
2683 ssize_t l;
2684 int r;
2685
2686 if ((r = poll(&pollfd, 1, 0)) < 0) {
2687
2688 if (errno == EINTR)
2689 continue;
2690
2691 return -errno;
2692 }
2693
2694 if (r == 0)
2695 return 0;
2696
2697 if ((l = read(fd, buf, sizeof(buf))) < 0) {
2698
2699 if (errno == EINTR)
2700 continue;
2701
2702 if (errno == EAGAIN)
2703 return 0;
2704
2705 return -errno;
2706 }
2707
2708 if (l <= 0)
2709 return 0;
2710 }
2711 }
2712
2713 int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocstty_eperm) {
2714 int fd = -1, notify = -1, r, wd = -1;
2715
2716 assert(name);
2717
2718 /* We use inotify to be notified when the tty is closed. We
2719 * create the watch before checking if we can actually acquire
2720 * it, so that we don't lose any event.
2721 *
2722 * Note: strictly speaking this actually watches for the
2723 * device being closed, it does *not* really watch whether a
2724 * tty loses its controlling process. However, unless some
2725 * rogue process uses TIOCNOTTY on /dev/tty *after* closing
2726 * its tty otherwise this will not become a problem. As long
2727 * as the administrator makes sure not configure any service
2728 * on the same tty as an untrusted user this should not be a
2729 * problem. (Which he probably should not do anyway.) */
2730
2731 if (!fail && !force) {
2732 if ((notify = inotify_init1(IN_CLOEXEC)) < 0) {
2733 r = -errno;
2734 goto fail;
2735 }
2736
2737 if ((wd = inotify_add_watch(notify, name, IN_CLOSE)) < 0) {
2738 r = -errno;
2739 goto fail;
2740 }
2741 }
2742
2743 for (;;) {
2744 if (notify >= 0)
2745 if ((r = flush_fd(notify)) < 0)
2746 goto fail;
2747
2748 /* We pass here O_NOCTTY only so that we can check the return
2749 * value TIOCSCTTY and have a reliable way to figure out if we
2750 * successfully became the controlling process of the tty */
2751 if ((fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0)
2752 return fd;
2753
2754 /* First, try to get the tty */
2755 r = ioctl(fd, TIOCSCTTY, force);
2756
2757 /* Sometimes it makes sense to ignore TIOCSCTTY
2758 * returning EPERM, i.e. when very likely we already
2759 * are have this controlling terminal. */
2760 if (r < 0 && errno == EPERM && ignore_tiocstty_eperm)
2761 r = 0;
2762
2763 if (r < 0 && (force || fail || errno != EPERM)) {
2764 r = -errno;
2765 goto fail;
2766 }
2767
2768 if (r >= 0)
2769 break;
2770
2771 assert(!fail);
2772 assert(!force);
2773 assert(notify >= 0);
2774
2775 for (;;) {
2776 uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
2777 ssize_t l;
2778 struct inotify_event *e;
2779
2780 if ((l = read(notify, inotify_buffer, sizeof(inotify_buffer))) < 0) {
2781
2782 if (errno == EINTR)
2783 continue;
2784
2785 r = -errno;
2786 goto fail;
2787 }
2788
2789 e = (struct inotify_event*) inotify_buffer;
2790
2791 while (l > 0) {
2792 size_t step;
2793
2794 if (e->wd != wd || !(e->mask & IN_CLOSE)) {
2795 r = -EIO;
2796 goto fail;
2797 }
2798
2799 step = sizeof(struct inotify_event) + e->len;
2800 assert(step <= (size_t) l);
2801
2802 e = (struct inotify_event*) ((uint8_t*) e + step);
2803 l -= step;
2804 }
2805
2806 break;
2807 }
2808
2809 /* We close the tty fd here since if the old session
2810 * ended our handle will be dead. It's important that
2811 * we do this after sleeping, so that we don't enter
2812 * an endless loop. */
2813 close_nointr_nofail(fd);
2814 }
2815
2816 if (notify >= 0)
2817 close_nointr_nofail(notify);
2818
2819 r = reset_terminal_fd(fd, true);
2820 if (r < 0)
2821 log_warning("Failed to reset terminal: %s", strerror(-r));
2822
2823 return fd;
2824
2825 fail:
2826 if (fd >= 0)
2827 close_nointr_nofail(fd);
2828
2829 if (notify >= 0)
2830 close_nointr_nofail(notify);
2831
2832 return r;
2833 }
2834
2835 int release_terminal(void) {
2836 int r = 0, fd;
2837 struct sigaction sa_old, sa_new;
2838
2839 if ((fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC)) < 0)
2840 return -errno;
2841
2842 /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
2843 * by our own TIOCNOTTY */
2844
2845 zero(sa_new);
2846 sa_new.sa_handler = SIG_IGN;
2847 sa_new.sa_flags = SA_RESTART;
2848 assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
2849
2850 if (ioctl(fd, TIOCNOTTY) < 0)
2851 r = -errno;
2852
2853 assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
2854
2855 close_nointr_nofail(fd);
2856 return r;
2857 }
2858
2859 int sigaction_many(const struct sigaction *sa, ...) {
2860 va_list ap;
2861 int r = 0, sig;
2862
2863 va_start(ap, sa);
2864 while ((sig = va_arg(ap, int)) > 0)
2865 if (sigaction(sig, sa, NULL) < 0)
2866 r = -errno;
2867 va_end(ap);
2868
2869 return r;
2870 }
2871
2872 int ignore_signals(int sig, ...) {
2873 struct sigaction sa;
2874 va_list ap;
2875 int r = 0;
2876
2877 zero(sa);
2878 sa.sa_handler = SIG_IGN;
2879 sa.sa_flags = SA_RESTART;
2880
2881 if (sigaction(sig, &sa, NULL) < 0)
2882 r = -errno;
2883
2884 va_start(ap, sig);
2885 while ((sig = va_arg(ap, int)) > 0)
2886 if (sigaction(sig, &sa, NULL) < 0)
2887 r = -errno;
2888 va_end(ap);
2889
2890 return r;
2891 }
2892
2893 int default_signals(int sig, ...) {
2894 struct sigaction sa;
2895 va_list ap;
2896 int r = 0;
2897
2898 zero(sa);
2899 sa.sa_handler = SIG_DFL;
2900 sa.sa_flags = SA_RESTART;
2901
2902 if (sigaction(sig, &sa, NULL) < 0)
2903 r = -errno;
2904
2905 va_start(ap, sig);
2906 while ((sig = va_arg(ap, int)) > 0)
2907 if (sigaction(sig, &sa, NULL) < 0)
2908 r = -errno;
2909 va_end(ap);
2910
2911 return r;
2912 }
2913
2914 int close_pipe(int p[]) {
2915 int a = 0, b = 0;
2916
2917 assert(p);
2918
2919 if (p[0] >= 0) {
2920 a = close_nointr(p[0]);
2921 p[0] = -1;
2922 }
2923
2924 if (p[1] >= 0) {
2925 b = close_nointr(p[1]);
2926 p[1] = -1;
2927 }
2928
2929 return a < 0 ? a : b;
2930 }
2931
2932 ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll) {
2933 uint8_t *p;
2934 ssize_t n = 0;
2935
2936 assert(fd >= 0);
2937 assert(buf);
2938
2939 p = buf;
2940
2941 while (nbytes > 0) {
2942 ssize_t k;
2943
2944 if ((k = read(fd, p, nbytes)) <= 0) {
2945
2946 if (k < 0 && errno == EINTR)
2947 continue;
2948
2949 if (k < 0 && errno == EAGAIN && do_poll) {
2950 struct pollfd pollfd;
2951
2952 zero(pollfd);
2953 pollfd.fd = fd;
2954 pollfd.events = POLLIN;
2955
2956 if (poll(&pollfd, 1, -1) < 0) {
2957 if (errno == EINTR)
2958 continue;
2959
2960 return n > 0 ? n : -errno;
2961 }
2962
2963 if (pollfd.revents != POLLIN)
2964 return n > 0 ? n : -EIO;
2965
2966 continue;
2967 }
2968
2969 return n > 0 ? n : (k < 0 ? -errno : 0);
2970 }
2971
2972 p += k;
2973 nbytes -= k;
2974 n += k;
2975 }
2976
2977 return n;
2978 }
2979
2980 ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) {
2981 const uint8_t *p;
2982 ssize_t n = 0;
2983
2984 assert(fd >= 0);
2985 assert(buf);
2986
2987 p = buf;
2988
2989 while (nbytes > 0) {
2990 ssize_t k;
2991
2992 k = write(fd, p, nbytes);
2993 if (k <= 0) {
2994
2995 if (k < 0 && errno == EINTR)
2996 continue;
2997
2998 if (k < 0 && errno == EAGAIN && do_poll) {
2999 struct pollfd pollfd;
3000
3001 zero(pollfd);
3002 pollfd.fd = fd;
3003 pollfd.events = POLLOUT;
3004
3005 if (poll(&pollfd, 1, -1) < 0) {
3006 if (errno == EINTR)
3007 continue;
3008
3009 return n > 0 ? n : -errno;
3010 }
3011
3012 if (pollfd.revents != POLLOUT)
3013 return n > 0 ? n : -EIO;
3014
3015 continue;
3016 }
3017
3018 return n > 0 ? n : (k < 0 ? -errno : 0);
3019 }
3020
3021 p += k;
3022 nbytes -= k;
3023 n += k;
3024 }
3025
3026 return n;
3027 }
3028
3029 int path_is_mount_point(const char *t, bool allow_symlink) {
3030 struct stat a, b;
3031 char *parent;
3032 int r;
3033
3034 if (allow_symlink)
3035 r = stat(t, &a);
3036 else
3037 r = lstat(t, &a);
3038
3039 if (r < 0) {
3040 if (errno == ENOENT)
3041 return 0;
3042
3043 return -errno;
3044 }
3045
3046 r = parent_of_path(t, &parent);
3047 if (r < 0)
3048 return r;
3049
3050 r = lstat(parent, &b);
3051 free(parent);
3052
3053 if (r < 0)
3054 return -errno;
3055
3056 return a.st_dev != b.st_dev;
3057 }
3058
3059 int parse_usec(const char *t, usec_t *usec) {
3060 static const struct {
3061 const char *suffix;
3062 usec_t usec;
3063 } table[] = {
3064 { "sec", USEC_PER_SEC },
3065 { "s", USEC_PER_SEC },
3066 { "min", USEC_PER_MINUTE },
3067 { "hr", USEC_PER_HOUR },
3068 { "h", USEC_PER_HOUR },
3069 { "d", USEC_PER_DAY },
3070 { "w", USEC_PER_WEEK },
3071 { "msec", USEC_PER_MSEC },
3072 { "ms", USEC_PER_MSEC },
3073 { "m", USEC_PER_MINUTE },
3074 { "usec", 1ULL },
3075 { "us", 1ULL },
3076 { "", USEC_PER_SEC },
3077 };
3078
3079 const char *p;
3080 usec_t r = 0;
3081
3082 assert(t);
3083 assert(usec);
3084
3085 p = t;
3086 do {
3087 long long l;
3088 char *e;
3089 unsigned i;
3090
3091 errno = 0;
3092 l = strtoll(p, &e, 10);
3093
3094 if (errno != 0)
3095 return -errno;
3096
3097 if (l < 0)
3098 return -ERANGE;
3099
3100 if (e == p)
3101 return -EINVAL;
3102
3103 e += strspn(e, WHITESPACE);
3104
3105 for (i = 0; i < ELEMENTSOF(table); i++)
3106 if (startswith(e, table[i].suffix)) {
3107 r += (usec_t) l * table[i].usec;
3108 p = e + strlen(table[i].suffix);
3109 break;
3110 }
3111
3112 if (i >= ELEMENTSOF(table))
3113 return -EINVAL;
3114
3115 } while (*p != 0);
3116
3117 *usec = r;
3118
3119 return 0;
3120 }
3121
3122 int parse_bytes(const char *t, off_t *bytes) {
3123 static const struct {
3124 const char *suffix;
3125 off_t factor;
3126 } table[] = {
3127 { "B", 1 },
3128 { "K", 1024ULL },
3129 { "M", 1024ULL*1024ULL },
3130 { "G", 1024ULL*1024ULL*1024ULL },
3131 { "T", 1024ULL*1024ULL*1024ULL*1024ULL },
3132 { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
3133 { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
3134 { "", 1 },
3135 };
3136
3137 const char *p;
3138 off_t r = 0;
3139
3140 assert(t);
3141 assert(bytes);
3142
3143 p = t;
3144 do {
3145 long long l;
3146 char *e;
3147 unsigned i;
3148
3149 errno = 0;
3150 l = strtoll(p, &e, 10);
3151
3152 if (errno != 0)
3153 return -errno;
3154
3155 if (l < 0)
3156 return -ERANGE;
3157
3158 if (e == p)
3159 return -EINVAL;
3160
3161 e += strspn(e, WHITESPACE);
3162
3163 for (i = 0; i < ELEMENTSOF(table); i++)
3164 if (startswith(e, table[i].suffix)) {
3165 r += (off_t) l * table[i].factor;
3166 p = e + strlen(table[i].suffix);
3167 break;
3168 }
3169
3170 if (i >= ELEMENTSOF(table))
3171 return -EINVAL;
3172
3173 } while (*p != 0);
3174
3175 *bytes = r;
3176
3177 return 0;
3178 }
3179
3180 int make_stdio(int fd) {
3181 int r, s, t;
3182
3183 assert(fd >= 0);
3184
3185 r = dup2(fd, STDIN_FILENO);
3186 s = dup2(fd, STDOUT_FILENO);
3187 t = dup2(fd, STDERR_FILENO);
3188
3189 if (fd >= 3)
3190 close_nointr_nofail(fd);
3191
3192 if (r < 0 || s < 0 || t < 0)
3193 return -errno;
3194
3195 fd_cloexec(STDIN_FILENO, false);
3196 fd_cloexec(STDOUT_FILENO, false);
3197 fd_cloexec(STDERR_FILENO, false);
3198
3199 return 0;
3200 }
3201
3202 int make_null_stdio(void) {
3203 int null_fd;
3204
3205 if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0)
3206 return -errno;
3207
3208 return make_stdio(null_fd);
3209 }
3210
3211 bool is_device_path(const char *path) {
3212
3213 /* Returns true on paths that refer to a device, either in
3214 * sysfs or in /dev */
3215
3216 return
3217 path_startswith(path, "/dev/") ||
3218 path_startswith(path, "/sys/");
3219 }
3220
3221 int dir_is_empty(const char *path) {
3222 DIR *d;
3223 int r;
3224 struct dirent buf, *de;
3225
3226 if (!(d = opendir(path)))
3227 return -errno;
3228
3229 for (;;) {
3230 if ((r = readdir_r(d, &buf, &de)) > 0) {
3231 r = -r;
3232 break;
3233 }
3234
3235 if (!de) {
3236 r = 1;
3237 break;
3238 }
3239
3240 if (!ignore_file(de->d_name)) {
3241 r = 0;
3242 break;
3243 }
3244 }
3245
3246 closedir(d);
3247 return r;
3248 }
3249
3250 unsigned long long random_ull(void) {
3251 int fd;
3252 uint64_t ull;
3253 ssize_t r;
3254
3255 if ((fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY)) < 0)
3256 goto fallback;
3257
3258 r = loop_read(fd, &ull, sizeof(ull), true);
3259 close_nointr_nofail(fd);
3260
3261 if (r != sizeof(ull))
3262 goto fallback;
3263
3264 return ull;
3265
3266 fallback:
3267 return random() * RAND_MAX + random();
3268 }
3269
3270 void rename_process(const char name[8]) {
3271 assert(name);
3272
3273 /* This is a like a poor man's setproctitle(). It changes the
3274 * comm field, argv[0], and also the glibc's internally used
3275 * name of the process. For the first one a limit of 16 chars
3276 * applies, to the second one usually one of 10 (i.e. length
3277 * of "/sbin/init"), to the third one one of 7 (i.e. length of
3278 * "systemd"). If you pass a longer string it will be
3279 * truncated */
3280
3281 prctl(PR_SET_NAME, name);
3282
3283 if (program_invocation_name)
3284 strncpy(program_invocation_name, name, strlen(program_invocation_name));
3285
3286 if (saved_argc > 0) {
3287 int i;
3288
3289 if (saved_argv[0])
3290 strncpy(saved_argv[0], name, strlen(saved_argv[0]));
3291
3292 for (i = 1; i < saved_argc; i++) {
3293 if (!saved_argv[i])
3294 break;
3295
3296 memset(saved_argv[i], 0, strlen(saved_argv[i]));
3297 }
3298 }
3299 }
3300
3301 void sigset_add_many(sigset_t *ss, ...) {
3302 va_list ap;
3303 int sig;
3304
3305 assert(ss);
3306
3307 va_start(ap, ss);
3308 while ((sig = va_arg(ap, int)) > 0)
3309 assert_se(sigaddset(ss, sig) == 0);
3310 va_end(ap);
3311 }
3312
3313 char* gethostname_malloc(void) {
3314 struct utsname u;
3315
3316 assert_se(uname(&u) >= 0);
3317
3318 if (u.nodename[0])
3319 return strdup(u.nodename);
3320
3321 return strdup(u.sysname);
3322 }
3323
3324 char* getlogname_malloc(void) {
3325 uid_t uid;
3326 long bufsize;
3327 char *buf, *name;
3328 struct passwd pwbuf, *pw = NULL;
3329 struct stat st;
3330
3331 if (isatty(STDIN_FILENO) && fstat(STDIN_FILENO, &st) >= 0)
3332 uid = st.st_uid;
3333 else
3334 uid = getuid();
3335
3336 /* Shortcut things to avoid NSS lookups */
3337 if (uid == 0)
3338 return strdup("root");
3339
3340 if ((bufsize = sysconf(_SC_GETPW_R_SIZE_MAX)) <= 0)
3341 bufsize = 4096;
3342
3343 if (!(buf = malloc(bufsize)))
3344 return NULL;
3345
3346 if (getpwuid_r(uid, &pwbuf, buf, bufsize, &pw) == 0 && pw) {
3347 name = strdup(pw->pw_name);
3348 free(buf);
3349 return name;
3350 }
3351
3352 free(buf);
3353
3354 if (asprintf(&name, "%lu", (unsigned long) uid) < 0)
3355 return NULL;
3356
3357 return name;
3358 }
3359
3360 int getttyname_malloc(int fd, char **r) {
3361 char path[PATH_MAX], *c;
3362 int k;
3363
3364 assert(r);
3365
3366 if ((k = ttyname_r(fd, path, sizeof(path))) != 0)
3367 return -k;
3368
3369 char_array_0(path);
3370
3371 if (!(c = strdup(startswith(path, "/dev/") ? path + 5 : path)))
3372 return -ENOMEM;
3373
3374 *r = c;
3375 return 0;
3376 }
3377
3378 int getttyname_harder(int fd, char **r) {
3379 int k;
3380 char *s;
3381
3382 if ((k = getttyname_malloc(fd, &s)) < 0)
3383 return k;
3384
3385 if (streq(s, "tty")) {
3386 free(s);
3387 return get_ctty(0, NULL, r);
3388 }
3389
3390 *r = s;
3391 return 0;
3392 }
3393
3394 int get_ctty_devnr(pid_t pid, dev_t *d) {
3395 int k;
3396 char line[LINE_MAX], *p, *fn;
3397 unsigned long ttynr;
3398 FILE *f;
3399
3400 if (asprintf(&fn, "/proc/%lu/stat", (unsigned long) (pid <= 0 ? getpid() : pid)) < 0)
3401 return -ENOMEM;
3402
3403 f = fopen(fn, "re");
3404 free(fn);
3405 if (!f)
3406 return -errno;
3407
3408 if (!fgets(line, sizeof(line), f)) {
3409 k = feof(f) ? -EIO : -errno;
3410 fclose(f);
3411 return k;
3412 }
3413
3414 fclose(f);
3415
3416 p = strrchr(line, ')');
3417 if (!p)
3418 return -EIO;
3419
3420 p++;
3421
3422 if (sscanf(p, " "
3423 "%*c " /* state */
3424 "%*d " /* ppid */
3425 "%*d " /* pgrp */
3426 "%*d " /* session */
3427 "%lu ", /* ttynr */
3428 &ttynr) != 1)
3429 return -EIO;
3430
3431 *d = (dev_t) ttynr;
3432 return 0;
3433 }
3434
3435 int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
3436 int k;
3437 char fn[PATH_MAX], *s, *b, *p;
3438 dev_t devnr;
3439
3440 assert(r);
3441
3442 k = get_ctty_devnr(pid, &devnr);
3443 if (k < 0)
3444 return k;
3445
3446 snprintf(fn, sizeof(fn), "/dev/char/%u:%u", major(devnr), minor(devnr));
3447 char_array_0(fn);
3448
3449 if ((k = readlink_malloc(fn, &s)) < 0) {
3450
3451 if (k != -ENOENT)
3452 return k;
3453
3454 /* This is an ugly hack */
3455 if (major(devnr) == 136) {
3456 if (asprintf(&b, "pts/%lu", (unsigned long) minor(devnr)) < 0)
3457 return -ENOMEM;
3458
3459 *r = b;
3460 if (_devnr)
3461 *_devnr = devnr;
3462
3463 return 0;
3464 }
3465
3466 /* Probably something like the ptys which have no
3467 * symlink in /dev/char. Let's return something
3468 * vaguely useful. */
3469
3470 if (!(b = strdup(fn + 5)))
3471 return -ENOMEM;
3472
3473 *r = b;
3474 if (_devnr)
3475 *_devnr = devnr;
3476
3477 return 0;
3478 }
3479
3480 if (startswith(s, "/dev/"))
3481 p = s + 5;
3482 else if (startswith(s, "../"))
3483 p = s + 3;
3484 else
3485 p = s;
3486
3487 b = strdup(p);
3488 free(s);
3489
3490 if (!b)
3491 return -ENOMEM;
3492
3493 *r = b;
3494 if (_devnr)
3495 *_devnr = devnr;
3496
3497 return 0;
3498 }
3499
3500 static int rm_rf_children(int fd, bool only_dirs, bool honour_sticky) {
3501 DIR *d;
3502 int ret = 0;
3503
3504 assert(fd >= 0);
3505
3506 /* This returns the first error we run into, but nevertheless
3507 * tries to go on */
3508
3509 if (!(d = fdopendir(fd))) {
3510 close_nointr_nofail(fd);
3511
3512 return errno == ENOENT ? 0 : -errno;
3513 }
3514
3515 for (;;) {
3516 struct dirent buf, *de;
3517 bool is_dir, keep_around = false;
3518 int r;
3519
3520 if ((r = readdir_r(d, &buf, &de)) != 0) {
3521 if (ret == 0)
3522 ret = -r;
3523 break;
3524 }
3525
3526 if (!de)
3527 break;
3528
3529 if (streq(de->d_name, ".") || streq(de->d_name, ".."))
3530 continue;
3531
3532 if (de->d_type == DT_UNKNOWN) {
3533 struct stat st;
3534
3535 if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
3536 if (ret == 0 && errno != ENOENT)
3537 ret = -errno;
3538 continue;
3539 }
3540
3541 if (honour_sticky)
3542 keep_around =
3543 (st.st_uid == 0 || st.st_uid == getuid()) &&
3544 (st.st_mode & S_ISVTX);
3545
3546 is_dir = S_ISDIR(st.st_mode);
3547
3548 } else {
3549 if (honour_sticky) {
3550 struct stat st;
3551
3552 if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
3553 if (ret == 0 && errno != ENOENT)
3554 ret = -errno;
3555 continue;
3556 }
3557
3558 keep_around =
3559 (st.st_uid == 0 || st.st_uid == getuid()) &&
3560 (st.st_mode & S_ISVTX);
3561 }
3562
3563 is_dir = de->d_type == DT_DIR;
3564 }
3565
3566 if (is_dir) {
3567 int subdir_fd;
3568
3569 if ((subdir_fd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC)) < 0) {
3570 if (ret == 0 && errno != ENOENT)
3571 ret = -errno;
3572 continue;
3573 }
3574
3575 if ((r = rm_rf_children(subdir_fd, only_dirs, honour_sticky)) < 0) {
3576 if (ret == 0)
3577 ret = r;
3578 }
3579
3580 if (!keep_around)
3581 if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) {
3582 if (ret == 0 && errno != ENOENT)
3583 ret = -errno;
3584 }
3585
3586 } else if (!only_dirs && !keep_around) {
3587
3588 if (unlinkat(fd, de->d_name, 0) < 0) {
3589 if (ret == 0 && errno != ENOENT)
3590 ret = -errno;
3591 }
3592 }
3593 }
3594
3595 closedir(d);
3596
3597 return ret;
3598 }
3599
3600 int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) {
3601 int fd;
3602 int r;
3603
3604 assert(path);
3605
3606 if ((fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC)) < 0) {
3607
3608 if (errno != ENOTDIR)
3609 return -errno;
3610
3611 if (delete_root && !only_dirs)
3612 if (unlink(path) < 0)
3613 return -errno;
3614
3615 return 0;
3616 }
3617
3618 r = rm_rf_children(fd, only_dirs, honour_sticky);
3619
3620 if (delete_root) {
3621
3622 if (honour_sticky && file_is_priv_sticky(path) > 0)
3623 return r;
3624
3625 if (rmdir(path) < 0 && errno != ENOENT) {
3626 if (r == 0)
3627 r = -errno;
3628 }
3629 }
3630
3631 return r;
3632 }
3633
3634 int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) {
3635 assert(path);
3636
3637 /* Under the assumption that we are running privileged we
3638 * first change the access mode and only then hand out
3639 * ownership to avoid a window where access is too open. */
3640
3641 if (mode != (mode_t) -1)
3642 if (chmod(path, mode) < 0)
3643 return -errno;
3644
3645 if (uid != (uid_t) -1 || gid != (gid_t) -1)
3646 if (chown(path, uid, gid) < 0)
3647 return -errno;
3648
3649 return 0;
3650 }
3651
3652 int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid) {
3653 assert(fd >= 0);
3654
3655 /* Under the assumption that we are running privileged we
3656 * first change the access mode and only then hand out
3657 * ownership to avoid a window where access is too open. */
3658
3659 if (fchmod(fd, mode) < 0)
3660 return -errno;
3661
3662 if (fchown(fd, uid, gid) < 0)
3663 return -errno;
3664
3665 return 0;
3666 }
3667
3668 cpu_set_t* cpu_set_malloc(unsigned *ncpus) {
3669 cpu_set_t *r;
3670 unsigned n = 1024;
3671
3672 /* Allocates the cpuset in the right size */
3673
3674 for (;;) {
3675 if (!(r = CPU_ALLOC(n)))
3676 return NULL;
3677
3678 if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), r) >= 0) {
3679 CPU_ZERO_S(CPU_ALLOC_SIZE(n), r);
3680
3681 if (ncpus)
3682 *ncpus = n;
3683
3684 return r;
3685 }
3686
3687 CPU_FREE(r);
3688
3689 if (errno != EINVAL)
3690 return NULL;
3691
3692 n *= 2;
3693 }
3694 }
3695
3696 void status_vprintf(const char *status, bool ellipse, const char *format, va_list ap) {
3697 char *s = NULL, *spaces = NULL, *e;
3698 int fd = -1, c;
3699 size_t emax, sl, left;
3700 struct iovec iovec[5];
3701 int n = 0;
3702
3703 assert(format);
3704
3705 /* This independent of logging, as status messages are
3706 * optional and go exclusively to the console. */
3707
3708 if (vasprintf(&s, format, ap) < 0)
3709 goto finish;
3710
3711 fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
3712 if (fd < 0)
3713 goto finish;
3714
3715 if (ellipse) {
3716 c = fd_columns(fd);
3717 if (c <= 0)
3718 c = 80;
3719
3720 if (status) {
3721 sl = 2 + 6 + 1; /* " [" status "]" */
3722 emax = (size_t) c > sl ? c - sl - 1 : 0;
3723 } else
3724 emax = c - 1;
3725
3726 e = ellipsize(s, emax, 75);
3727 if (e) {
3728 free(s);
3729 s = e;
3730 }
3731 }
3732
3733 zero(iovec);
3734 IOVEC_SET_STRING(iovec[n++], s);
3735
3736 if (ellipse) {
3737 sl = strlen(s);
3738 left = emax > sl ? emax - sl : 0;
3739 if (left > 0) {
3740 spaces = malloc(left);
3741 if (spaces) {
3742 memset(spaces, ' ', left);
3743 iovec[n].iov_base = spaces;
3744 iovec[n].iov_len = left;
3745 n++;
3746 }
3747 }
3748 }
3749
3750 if (status) {
3751 IOVEC_SET_STRING(iovec[n++], " [");
3752 IOVEC_SET_STRING(iovec[n++], status);
3753 IOVEC_SET_STRING(iovec[n++], "]\n");
3754 } else
3755 IOVEC_SET_STRING(iovec[n++], "\n");
3756
3757 writev(fd, iovec, n);
3758
3759 finish:
3760 free(s);
3761 free(spaces);
3762
3763 if (fd >= 0)
3764 close_nointr_nofail(fd);
3765 }
3766
3767 void status_printf(const char *status, bool ellipse, const char *format, ...) {
3768 va_list ap;
3769
3770 assert(format);
3771
3772 va_start(ap, format);
3773 status_vprintf(status, ellipse, format, ap);
3774 va_end(ap);
3775 }
3776
3777 void status_welcome(void) {
3778 char *pretty_name = NULL, *ansi_color = NULL;
3779 const char *const_pretty = NULL, *const_color = NULL;
3780 int r;
3781
3782 if ((r = parse_env_file("/etc/os-release", NEWLINE,
3783 "PRETTY_NAME", &pretty_name,
3784 "ANSI_COLOR", &ansi_color,
3785 NULL)) < 0) {
3786
3787 if (r != -ENOENT)
3788 log_warning("Failed to read /etc/os-release: %s", strerror(-r));
3789 }
3790
3791 if (!pretty_name && !const_pretty)
3792 const_pretty = "Linux";
3793
3794 if (!ansi_color && !const_color)
3795 const_color = "1";
3796
3797 status_printf(NULL,
3798 false,
3799 "\nWelcome to \x1B[%sm%s\x1B[0m!\n",
3800 const_color ? const_color : ansi_color,
3801 const_pretty ? const_pretty : pretty_name);
3802
3803 free(ansi_color);
3804 free(pretty_name);
3805 }
3806
3807 char *replace_env(const char *format, char **env) {
3808 enum {
3809 WORD,
3810 CURLY,
3811 VARIABLE
3812 } state = WORD;
3813
3814 const char *e, *word = format;
3815 char *r = NULL, *k;
3816
3817 assert(format);
3818
3819 for (e = format; *e; e ++) {
3820
3821 switch (state) {
3822
3823 case WORD:
3824 if (*e == '$')
3825 state = CURLY;
3826 break;
3827
3828 case CURLY:
3829 if (*e == '{') {
3830 if (!(k = strnappend(r, word, e-word-1)))
3831 goto fail;
3832
3833 free(r);
3834 r = k;
3835
3836 word = e-1;
3837 state = VARIABLE;
3838
3839 } else if (*e == '$') {
3840 if (!(k = strnappend(r, word, e-word)))
3841 goto fail;
3842
3843 free(r);
3844 r = k;
3845
3846 word = e+1;
3847 state = WORD;
3848 } else
3849 state = WORD;
3850 break;
3851
3852 case VARIABLE:
3853 if (*e == '}') {
3854 const char *t;
3855
3856 if (!(t = strv_env_get_with_length(env, word+2, e-word-2)))
3857 t = "";
3858
3859 if (!(k = strappend(r, t)))
3860 goto fail;
3861
3862 free(r);
3863 r = k;
3864
3865 word = e+1;
3866 state = WORD;
3867 }
3868 break;
3869 }
3870 }
3871
3872 if (!(k = strnappend(r, word, e-word)))
3873 goto fail;
3874
3875 free(r);
3876 return k;
3877
3878 fail:
3879 free(r);
3880 return NULL;
3881 }
3882
3883 char **replace_env_argv(char **argv, char **env) {
3884 char **r, **i;
3885 unsigned k = 0, l = 0;
3886
3887 l = strv_length(argv);
3888
3889 if (!(r = new(char*, l+1)))
3890 return NULL;
3891
3892 STRV_FOREACH(i, argv) {
3893
3894 /* If $FOO appears as single word, replace it by the split up variable */
3895 if ((*i)[0] == '$' && (*i)[1] != '{') {
3896 char *e;
3897 char **w, **m;
3898 unsigned q;
3899
3900 if ((e = strv_env_get(env, *i+1))) {
3901
3902 if (!(m = strv_split_quoted(e))) {
3903 r[k] = NULL;
3904 strv_free(r);
3905 return NULL;
3906 }
3907 } else
3908 m = NULL;
3909
3910 q = strv_length(m);
3911 l = l + q - 1;
3912
3913 if (!(w = realloc(r, sizeof(char*) * (l+1)))) {
3914 r[k] = NULL;
3915 strv_free(r);
3916 strv_free(m);
3917 return NULL;
3918 }
3919
3920 r = w;
3921 if (m) {
3922 memcpy(r + k, m, q * sizeof(char*));
3923 free(m);
3924 }
3925
3926 k += q;
3927 continue;
3928 }
3929
3930 /* If ${FOO} appears as part of a word, replace it by the variable as-is */
3931 if (!(r[k++] = replace_env(*i, env))) {
3932 strv_free(r);
3933 return NULL;
3934 }
3935 }
3936
3937 r[k] = NULL;
3938 return r;
3939 }
3940
3941 int fd_columns(int fd) {
3942 struct winsize ws;
3943 zero(ws);
3944
3945 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
3946 return -errno;
3947
3948 if (ws.ws_col <= 0)
3949 return -EIO;
3950
3951 return ws.ws_col;
3952 }
3953
3954 unsigned columns(void) {
3955 static __thread int parsed_columns = 0;
3956 const char *e;
3957
3958 if (_likely_(parsed_columns > 0))
3959 return parsed_columns;
3960
3961 e = getenv("COLUMNS");
3962 if (e)
3963 parsed_columns = atoi(e);
3964
3965 if (parsed_columns <= 0)
3966 parsed_columns = fd_columns(STDOUT_FILENO);
3967
3968 if (parsed_columns <= 0)
3969 parsed_columns = 80;
3970
3971 return parsed_columns;
3972 }
3973
3974 int fd_lines(int fd) {
3975 struct winsize ws;
3976 zero(ws);
3977
3978 if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
3979 return -errno;
3980
3981 if (ws.ws_row <= 0)
3982 return -EIO;
3983
3984 return ws.ws_row;
3985 }
3986
3987 unsigned lines(void) {
3988 static __thread int parsed_lines = 0;
3989 const char *e;
3990
3991 if (_likely_(parsed_lines > 0))
3992 return parsed_lines;
3993
3994 e = getenv("LINES");
3995 if (e)
3996 parsed_lines = atoi(e);
3997
3998 if (parsed_lines <= 0)
3999 parsed_lines = fd_lines(STDOUT_FILENO);
4000
4001 if (parsed_lines <= 0)
4002 parsed_lines = 25;
4003
4004 return parsed_lines;
4005 }
4006
4007 int running_in_chroot(void) {
4008 struct stat a, b;
4009
4010 zero(a);
4011 zero(b);
4012
4013 /* Only works as root */
4014
4015 if (stat("/proc/1/root", &a) < 0)
4016 return -errno;
4017
4018 if (stat("/", &b) < 0)
4019 return -errno;
4020
4021 return
4022 a.st_dev != b.st_dev ||
4023 a.st_ino != b.st_ino;
4024 }
4025
4026 char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) {
4027 size_t x;
4028 char *r;
4029
4030 assert(s);
4031 assert(percent <= 100);
4032 assert(new_length >= 3);
4033
4034 if (old_length <= 3 || old_length <= new_length)
4035 return strndup(s, old_length);
4036
4037 r = new0(char, new_length+1);
4038 if (!r)
4039 return r;
4040
4041 x = (new_length * percent) / 100;
4042
4043 if (x > new_length - 3)
4044 x = new_length - 3;
4045
4046 memcpy(r, s, x);
4047 r[x] = '.';
4048 r[x+1] = '.';
4049 r[x+2] = '.';
4050 memcpy(r + x + 3,
4051 s + old_length - (new_length - x - 3),
4052 new_length - x - 3);
4053
4054 return r;
4055 }
4056
4057 char *ellipsize(const char *s, size_t length, unsigned percent) {
4058 return ellipsize_mem(s, strlen(s), length, percent);
4059 }
4060
4061 int touch(const char *path) {
4062 int fd;
4063
4064 assert(path);
4065
4066 if ((fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0644)) < 0)
4067 return -errno;
4068
4069 close_nointr_nofail(fd);
4070 return 0;
4071 }
4072
4073 char *unquote(const char *s, const char* quotes) {
4074 size_t l;
4075 assert(s);
4076
4077 l = strlen(s);
4078 if (l < 2)
4079 return strdup(s);
4080
4081 if (strchr(quotes, s[0]) && s[l-1] == s[0])
4082 return strndup(s+1, l-2);
4083
4084 return strdup(s);
4085 }
4086
4087 char *normalize_env_assignment(const char *s) {
4088 char *name, *value, *p, *r;
4089
4090 p = strchr(s, '=');
4091
4092 if (!p) {
4093 if (!(r = strdup(s)))
4094 return NULL;
4095
4096 return strstrip(r);
4097 }
4098
4099 if (!(name = strndup(s, p - s)))
4100 return NULL;
4101
4102 if (!(p = strdup(p+1))) {
4103 free(name);
4104 return NULL;
4105 }
4106
4107 value = unquote(strstrip(p), QUOTES);
4108 free(p);
4109
4110 if (!value) {
4111 free(name);
4112 return NULL;
4113 }
4114
4115 if (asprintf(&r, "%s=%s", name, value) < 0)
4116 r = NULL;
4117
4118 free(value);
4119 free(name);
4120
4121 return r;
4122 }
4123
4124 int wait_for_terminate(pid_t pid, siginfo_t *status) {
4125 siginfo_t dummy;
4126
4127 assert(pid >= 1);
4128
4129 if (!status)
4130 status = &dummy;
4131
4132 for (;;) {
4133 zero(*status);
4134
4135 if (waitid(P_PID, pid, status, WEXITED) < 0) {
4136
4137 if (errno == EINTR)
4138 continue;
4139
4140 return -errno;
4141 }
4142
4143 return 0;
4144 }
4145 }
4146
4147 int wait_for_terminate_and_warn(const char *name, pid_t pid) {
4148 int r;
4149 siginfo_t status;
4150
4151 assert(name);
4152 assert(pid > 1);
4153
4154 if ((r = wait_for_terminate(pid, &status)) < 0) {
4155 log_warning("Failed to wait for %s: %s", name, strerror(-r));
4156 return r;
4157 }
4158
4159 if (status.si_code == CLD_EXITED) {
4160 if (status.si_status != 0) {
4161 log_warning("%s failed with error code %i.", name, status.si_status);
4162 return status.si_status;
4163 }
4164
4165 log_debug("%s succeeded.", name);
4166 return 0;
4167
4168 } else if (status.si_code == CLD_KILLED ||
4169 status.si_code == CLD_DUMPED) {
4170
4171 log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status));
4172 return -EPROTO;
4173 }
4174
4175 log_warning("%s failed due to unknown reason.", name);
4176 return -EPROTO;
4177
4178 }
4179
4180 _noreturn_ void freeze(void) {
4181
4182 /* Make sure nobody waits for us on a socket anymore */
4183 close_all_fds(NULL, 0);
4184
4185 sync();
4186
4187 for (;;)
4188 pause();
4189 }
4190
4191 bool null_or_empty(struct stat *st) {
4192 assert(st);
4193
4194 if (S_ISREG(st->st_mode) && st->st_size <= 0)
4195 return true;
4196
4197 if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode))
4198 return true;
4199
4200 return false;
4201 }
4202
4203 int null_or_empty_path(const char *fn) {
4204 struct stat st;
4205
4206 assert(fn);
4207
4208 if (stat(fn, &st) < 0)
4209 return -errno;
4210
4211 return null_or_empty(&st);
4212 }
4213
4214 DIR *xopendirat(int fd, const char *name, int flags) {
4215 int nfd;
4216 DIR *d;
4217
4218 if ((nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags)) < 0)
4219 return NULL;
4220
4221 if (!(d = fdopendir(nfd))) {
4222 close_nointr_nofail(nfd);
4223 return NULL;
4224 }
4225
4226 return d;
4227 }
4228
4229 int signal_from_string_try_harder(const char *s) {
4230 int signo;
4231 assert(s);
4232
4233 if ((signo = signal_from_string(s)) <= 0)
4234 if (startswith(s, "SIG"))
4235 return signal_from_string(s+3);
4236
4237 return signo;
4238 }
4239
4240 void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t) {
4241
4242 assert(f);
4243 assert(name);
4244 assert(t);
4245
4246 if (!dual_timestamp_is_set(t))
4247 return;
4248
4249 fprintf(f, "%s=%llu %llu\n",
4250 name,
4251 (unsigned long long) t->realtime,
4252 (unsigned long long) t->monotonic);
4253 }
4254
4255 void dual_timestamp_deserialize(const char *value, dual_timestamp *t) {
4256 unsigned long long a, b;
4257
4258 assert(value);
4259 assert(t);
4260
4261 if (sscanf(value, "%lli %llu", &a, &b) != 2)
4262 log_debug("Failed to parse finish timestamp value %s", value);
4263 else {
4264 t->realtime = a;
4265 t->monotonic = b;
4266 }
4267 }
4268
4269 char *fstab_node_to_udev_node(const char *p) {
4270 char *dn, *t, *u;
4271 int r;
4272
4273 /* FIXME: to follow udev's logic 100% we need to leave valid
4274 * UTF8 chars unescaped */
4275
4276 if (startswith(p, "LABEL=")) {
4277
4278 if (!(u = unquote(p+6, "\"\'")))
4279 return NULL;
4280
4281 t = xescape(u, "/ ");
4282 free(u);
4283
4284 if (!t)
4285 return NULL;
4286
4287 r = asprintf(&dn, "/dev/disk/by-label/%s", t);
4288 free(t);
4289
4290 if (r < 0)
4291 return NULL;
4292
4293 return dn;
4294 }
4295
4296 if (startswith(p, "UUID=")) {
4297
4298 if (!(u = unquote(p+5, "\"\'")))
4299 return NULL;
4300
4301 t = xescape(u, "/ ");
4302 free(u);
4303
4304 if (!t)
4305 return NULL;
4306
4307 r = asprintf(&dn, "/dev/disk/by-uuid/%s", t);
4308 free(t);
4309
4310 if (r < 0)
4311 return NULL;
4312
4313 return dn;
4314 }
4315
4316 return strdup(p);
4317 }
4318
4319 void filter_environ(const char *prefix) {
4320 int i, j;
4321 assert(prefix);
4322
4323 if (!environ)
4324 return;
4325
4326 for (i = 0, j = 0; environ[i]; i++) {
4327
4328 if (startswith(environ[i], prefix))
4329 continue;
4330
4331 environ[j++] = environ[i];
4332 }
4333
4334 environ[j] = NULL;
4335 }
4336
4337 bool tty_is_vc(const char *tty) {
4338 assert(tty);
4339
4340 if (startswith(tty, "/dev/"))
4341 tty += 5;
4342
4343 return vtnr_from_tty(tty) >= 0;
4344 }
4345
4346 int vtnr_from_tty(const char *tty) {
4347 int i, r;
4348
4349 assert(tty);
4350
4351 if (startswith(tty, "/dev/"))
4352 tty += 5;
4353
4354 if (!startswith(tty, "tty") )
4355 return -EINVAL;
4356
4357 if (tty[3] < '0' || tty[3] > '9')
4358 return -EINVAL;
4359
4360 r = safe_atoi(tty+3, &i);
4361 if (r < 0)
4362 return r;
4363
4364 if (i < 0 || i > 63)
4365 return -EINVAL;
4366
4367 return i;
4368 }
4369
4370 bool tty_is_vc_resolve(const char *tty) {
4371 char *active = NULL;
4372 bool b;
4373
4374 assert(tty);
4375
4376 if (startswith(tty, "/dev/"))
4377 tty += 5;
4378
4379 /* Resolve where /dev/console is pointing to */
4380 if (streq(tty, "console"))
4381 if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
4382 /* If multiple log outputs are configured the
4383 * last one is what /dev/console points to */
4384 tty = strrchr(active, ' ');
4385 if (tty)
4386 tty++;
4387 else
4388 tty = active;
4389 }
4390
4391 b = tty_is_vc(tty);
4392 free(active);
4393
4394 return b;
4395 }
4396
4397 const char *default_term_for_tty(const char *tty) {
4398 assert(tty);
4399
4400 return tty_is_vc_resolve(tty) ? "TERM=linux" : "TERM=vt100";
4401 }
4402
4403 bool dirent_is_file(const struct dirent *de) {
4404 assert(de);
4405
4406 if (ignore_file(de->d_name))
4407 return false;
4408
4409 if (de->d_type != DT_REG &&
4410 de->d_type != DT_LNK &&
4411 de->d_type != DT_UNKNOWN)
4412 return false;
4413
4414 return true;
4415 }
4416
4417 bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) {
4418 assert(de);
4419
4420 if (!dirent_is_file(de))
4421 return false;
4422
4423 return endswith(de->d_name, suffix);
4424 }
4425
4426 void execute_directory(const char *directory, DIR *d, char *argv[]) {
4427 DIR *_d = NULL;
4428 struct dirent *de;
4429 Hashmap *pids = NULL;
4430
4431 assert(directory);
4432
4433 /* Executes all binaries in a directory in parallel and waits
4434 * until all they all finished. */
4435
4436 if (!d) {
4437 if (!(_d = opendir(directory))) {
4438
4439 if (errno == ENOENT)
4440 return;
4441
4442 log_error("Failed to enumerate directory %s: %m", directory);
4443 return;
4444 }
4445
4446 d = _d;
4447 }
4448
4449 if (!(pids = hashmap_new(trivial_hash_func, trivial_compare_func))) {
4450 log_error("Failed to allocate set.");
4451 goto finish;
4452 }
4453
4454 while ((de = readdir(d))) {
4455 char *path;
4456 pid_t pid;
4457 int k;
4458
4459 if (!dirent_is_file(de))
4460 continue;
4461
4462 if (asprintf(&path, "%s/%s", directory, de->d_name) < 0) {
4463 log_error("Out of memory");
4464 continue;
4465 }
4466
4467 if ((pid = fork()) < 0) {
4468 log_error("Failed to fork: %m");
4469 free(path);
4470 continue;
4471 }
4472
4473 if (pid == 0) {
4474 char *_argv[2];
4475 /* Child */
4476
4477 if (!argv) {
4478 _argv[0] = path;
4479 _argv[1] = NULL;
4480 argv = _argv;
4481 } else
4482 if (!argv[0])
4483 argv[0] = path;
4484
4485 execv(path, argv);
4486
4487 log_error("Failed to execute %s: %m", path);
4488 _exit(EXIT_FAILURE);
4489 }
4490
4491 log_debug("Spawned %s as %lu", path, (unsigned long) pid);
4492
4493 if ((k = hashmap_put(pids, UINT_TO_PTR(pid), path)) < 0) {
4494 log_error("Failed to add PID to set: %s", strerror(-k));
4495 free(path);
4496 }
4497 }
4498
4499 while (!hashmap_isempty(pids)) {
4500 pid_t pid = PTR_TO_UINT(hashmap_first_key(pids));
4501 siginfo_t si;
4502 char *path;
4503
4504 zero(si);
4505 if (waitid(P_PID, pid, &si, WEXITED) < 0) {
4506
4507 if (errno == EINTR)
4508 continue;
4509
4510 log_error("waitid() failed: %m");
4511 goto finish;
4512 }
4513
4514 if ((path = hashmap_remove(pids, UINT_TO_PTR(si.si_pid)))) {
4515 if (!is_clean_exit(si.si_code, si.si_status)) {
4516 if (si.si_code == CLD_EXITED)
4517 log_error("%s exited with exit status %i.", path, si.si_status);
4518 else
4519 log_error("%s terminated by signal %s.", path, signal_to_string(si.si_status));
4520 } else
4521 log_debug("%s exited successfully.", path);
4522
4523 free(path);
4524 }
4525 }
4526
4527 finish:
4528 if (_d)
4529 closedir(_d);
4530
4531 if (pids)
4532 hashmap_free_free(pids);
4533 }
4534
4535 int kill_and_sigcont(pid_t pid, int sig) {
4536 int r;
4537
4538 r = kill(pid, sig) < 0 ? -errno : 0;
4539
4540 if (r >= 0)
4541 kill(pid, SIGCONT);
4542
4543 return r;
4544 }
4545
4546 bool nulstr_contains(const char*nulstr, const char *needle) {
4547 const char *i;
4548
4549 if (!nulstr)
4550 return false;
4551
4552 NULSTR_FOREACH(i, nulstr)
4553 if (streq(i, needle))
4554 return true;
4555
4556 return false;
4557 }
4558
4559 bool plymouth_running(void) {
4560 return access("/run/plymouth/pid", F_OK) >= 0;
4561 }
4562
4563 void parse_syslog_priority(char **p, int *priority) {
4564 int a = 0, b = 0, c = 0;
4565 int k;
4566
4567 assert(p);
4568 assert(*p);
4569 assert(priority);
4570
4571 if ((*p)[0] != '<')
4572 return;
4573
4574 if (!strchr(*p, '>'))
4575 return;
4576
4577 if ((*p)[2] == '>') {
4578 c = undecchar((*p)[1]);
4579 k = 3;
4580 } else if ((*p)[3] == '>') {
4581 b = undecchar((*p)[1]);
4582 c = undecchar((*p)[2]);
4583 k = 4;
4584 } else if ((*p)[4] == '>') {
4585 a = undecchar((*p)[1]);
4586 b = undecchar((*p)[2]);
4587 c = undecchar((*p)[3]);
4588 k = 5;
4589 } else
4590 return;
4591
4592 if (a < 0 || b < 0 || c < 0)
4593 return;
4594
4595 *priority = a*100+b*10+c;
4596 *p += k;
4597 }
4598
4599 void skip_syslog_pid(char **buf) {
4600 char *p;
4601
4602 assert(buf);
4603 assert(*buf);
4604
4605 p = *buf;
4606
4607 if (*p != '[')
4608 return;
4609
4610 p++;
4611 p += strspn(p, "0123456789");
4612
4613 if (*p != ']')
4614 return;
4615
4616 p++;
4617
4618 *buf = p;
4619 }
4620
4621 void skip_syslog_date(char **buf) {
4622 enum {
4623 LETTER,
4624 SPACE,
4625 NUMBER,
4626 SPACE_OR_NUMBER,
4627 COLON
4628 } sequence[] = {
4629 LETTER, LETTER, LETTER,
4630 SPACE,
4631 SPACE_OR_NUMBER, NUMBER,
4632 SPACE,
4633 SPACE_OR_NUMBER, NUMBER,
4634 COLON,
4635 SPACE_OR_NUMBER, NUMBER,
4636 COLON,
4637 SPACE_OR_NUMBER, NUMBER,
4638 SPACE
4639 };
4640
4641 char *p;
4642 unsigned i;
4643
4644 assert(buf);
4645 assert(*buf);
4646
4647 p = *buf;
4648
4649 for (i = 0; i < ELEMENTSOF(sequence); i++, p++) {
4650
4651 if (!*p)
4652 return;
4653
4654 switch (sequence[i]) {
4655
4656 case SPACE:
4657 if (*p != ' ')
4658 return;
4659 break;
4660
4661 case SPACE_OR_NUMBER:
4662 if (*p == ' ')
4663 break;
4664
4665 /* fall through */
4666
4667 case NUMBER:
4668 if (*p < '0' || *p > '9')
4669 return;
4670
4671 break;
4672
4673 case LETTER:
4674 if (!(*p >= 'A' && *p <= 'Z') &&
4675 !(*p >= 'a' && *p <= 'z'))
4676 return;
4677
4678 break;
4679
4680 case COLON:
4681 if (*p != ':')
4682 return;
4683 break;
4684
4685 }
4686 }
4687
4688 *buf = p;
4689 }
4690
4691 int have_effective_cap(int value) {
4692 cap_t cap;
4693 cap_flag_value_t fv;
4694 int r;
4695
4696 if (!(cap = cap_get_proc()))
4697 return -errno;
4698
4699 if (cap_get_flag(cap, value, CAP_EFFECTIVE, &fv) < 0)
4700 r = -errno;
4701 else
4702 r = fv == CAP_SET;
4703
4704 cap_free(cap);
4705 return r;
4706 }
4707
4708 char* strshorten(char *s, size_t l) {
4709 assert(s);
4710
4711 if (l < strlen(s))
4712 s[l] = 0;
4713
4714 return s;
4715 }
4716
4717 static bool hostname_valid_char(char c) {
4718 return
4719 (c >= 'a' && c <= 'z') ||
4720 (c >= 'A' && c <= 'Z') ||
4721 (c >= '0' && c <= '9') ||
4722 c == '-' ||
4723 c == '_' ||
4724 c == '.';
4725 }
4726
4727 bool hostname_is_valid(const char *s) {
4728 const char *p;
4729
4730 if (isempty(s))
4731 return false;
4732
4733 for (p = s; *p; p++)
4734 if (!hostname_valid_char(*p))
4735 return false;
4736
4737 if (p-s > HOST_NAME_MAX)
4738 return false;
4739
4740 return true;
4741 }
4742
4743 char* hostname_cleanup(char *s) {
4744 char *p, *d;
4745
4746 for (p = s, d = s; *p; p++)
4747 if ((*p >= 'a' && *p <= 'z') ||
4748 (*p >= 'A' && *p <= 'Z') ||
4749 (*p >= '0' && *p <= '9') ||
4750 *p == '-' ||
4751 *p == '_' ||
4752 *p == '.')
4753 *(d++) = *p;
4754
4755 *d = 0;
4756
4757 strshorten(s, HOST_NAME_MAX);
4758 return s;
4759 }
4760
4761 int pipe_eof(int fd) {
4762 struct pollfd pollfd;
4763 int r;
4764
4765 zero(pollfd);
4766 pollfd.fd = fd;
4767 pollfd.events = POLLIN|POLLHUP;
4768
4769 r = poll(&pollfd, 1, 0);
4770 if (r < 0)
4771 return -errno;
4772
4773 if (r == 0)
4774 return 0;
4775
4776 return pollfd.revents & POLLHUP;
4777 }
4778
4779 int fd_wait_for_event(int fd, int event, usec_t t) {
4780 struct pollfd pollfd;
4781 int r;
4782
4783 zero(pollfd);
4784 pollfd.fd = fd;
4785 pollfd.events = event;
4786
4787 r = poll(&pollfd, 1, t == (usec_t) -1 ? -1 : (int) (t / USEC_PER_MSEC));
4788 if (r < 0)
4789 return -errno;
4790
4791 if (r == 0)
4792 return 0;
4793
4794 return pollfd.revents;
4795 }
4796
4797 int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
4798 FILE *f;
4799 char *t;
4800 const char *fn;
4801 size_t k;
4802 int fd;
4803
4804 assert(path);
4805 assert(_f);
4806 assert(_temp_path);
4807
4808 t = new(char, strlen(path) + 1 + 6 + 1);
4809 if (!t)
4810 return -ENOMEM;
4811
4812 fn = file_name_from_path(path);
4813 k = fn-path;
4814 memcpy(t, path, k);
4815 t[k] = '.';
4816 stpcpy(stpcpy(t+k+1, fn), "XXXXXX");
4817
4818 fd = mkostemp(t, O_WRONLY|O_CLOEXEC);
4819 if (fd < 0) {
4820 free(t);
4821 return -errno;
4822 }
4823
4824 f = fdopen(fd, "we");
4825 if (!f) {
4826 unlink(t);
4827 free(t);
4828 return -errno;
4829 }
4830
4831 *_f = f;
4832 *_temp_path = t;
4833
4834 return 0;
4835 }
4836
4837 int terminal_vhangup_fd(int fd) {
4838 assert(fd >= 0);
4839
4840 if (ioctl(fd, TIOCVHANGUP) < 0)
4841 return -errno;
4842
4843 return 0;
4844 }
4845
4846 int terminal_vhangup(const char *name) {
4847 int fd, r;
4848
4849 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
4850 if (fd < 0)
4851 return fd;
4852
4853 r = terminal_vhangup_fd(fd);
4854 close_nointr_nofail(fd);
4855
4856 return r;
4857 }
4858
4859 int vt_disallocate(const char *name) {
4860 int fd, r;
4861 unsigned u;
4862
4863 /* Deallocate the VT if possible. If not possible
4864 * (i.e. because it is the active one), at least clear it
4865 * entirely (including the scrollback buffer) */
4866
4867 if (!startswith(name, "/dev/"))
4868 return -EINVAL;
4869
4870 if (!tty_is_vc(name)) {
4871 /* So this is not a VT. I guess we cannot deallocate
4872 * it then. But let's at least clear the screen */
4873
4874 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
4875 if (fd < 0)
4876 return fd;
4877
4878 loop_write(fd,
4879 "\033[r" /* clear scrolling region */
4880 "\033[H" /* move home */
4881 "\033[2J", /* clear screen */
4882 10, false);
4883 close_nointr_nofail(fd);
4884
4885 return 0;
4886 }
4887
4888 if (!startswith(name, "/dev/tty"))
4889 return -EINVAL;
4890
4891 r = safe_atou(name+8, &u);
4892 if (r < 0)
4893 return r;
4894
4895 if (u <= 0)
4896 return -EINVAL;
4897
4898 /* Try to deallocate */
4899 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
4900 if (fd < 0)
4901 return fd;
4902
4903 r = ioctl(fd, VT_DISALLOCATE, u);
4904 close_nointr_nofail(fd);
4905
4906 if (r >= 0)
4907 return 0;
4908
4909 if (errno != EBUSY)
4910 return -errno;
4911
4912 /* Couldn't deallocate, so let's clear it fully with
4913 * scrollback */
4914 fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
4915 if (fd < 0)
4916 return fd;
4917
4918 loop_write(fd,
4919 "\033[r" /* clear scrolling region */
4920 "\033[H" /* move home */
4921 "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */
4922 10, false);
4923 close_nointr_nofail(fd);
4924
4925 return 0;
4926 }
4927
4928 static int files_add(Hashmap *h, const char *path, const char *suffix) {
4929 DIR *dir;
4930 struct dirent buffer, *de;
4931 int r = 0;
4932
4933 dir = opendir(path);
4934 if (!dir) {
4935 if (errno == ENOENT)
4936 return 0;
4937 return -errno;
4938 }
4939
4940 for (;;) {
4941 int k;
4942 char *p, *f;
4943
4944 k = readdir_r(dir, &buffer, &de);
4945 if (k != 0) {
4946 r = -k;
4947 goto finish;
4948 }
4949
4950 if (!de)
4951 break;
4952
4953 if (!dirent_is_file_with_suffix(de, suffix))
4954 continue;
4955
4956 if (asprintf(&p, "%s/%s", path, de->d_name) < 0) {
4957 r = -ENOMEM;
4958 goto finish;
4959 }
4960
4961 f = canonicalize_file_name(p);
4962 if (!f) {
4963 log_error("Failed to canonicalize file name '%s': %m", p);
4964 free(p);
4965 continue;
4966 }
4967 free(p);
4968
4969 log_debug("found: %s\n", f);
4970 if (hashmap_put(h, file_name_from_path(f), f) <= 0)
4971 free(f);
4972 }
4973
4974 finish:
4975 closedir(dir);
4976 return r;
4977 }
4978
4979 static int base_cmp(const void *a, const void *b) {
4980 const char *s1, *s2;
4981
4982 s1 = *(char * const *)a;
4983 s2 = *(char * const *)b;
4984 return strcmp(file_name_from_path(s1), file_name_from_path(s2));
4985 }
4986
4987 int conf_files_list(char ***strv, const char *suffix, const char *dir, ...) {
4988 Hashmap *fh = NULL;
4989 char **dirs = NULL;
4990 char **files = NULL;
4991 char **p;
4992 va_list ap;
4993 int r = 0;
4994
4995 va_start(ap, dir);
4996 dirs = strv_new_ap(dir, ap);
4997 va_end(ap);
4998 if (!dirs) {
4999 r = -ENOMEM;
5000 goto finish;
5001 }
5002 if (!strv_path_canonicalize(dirs)) {
5003 r = -ENOMEM;
5004 goto finish;
5005 }
5006 if (!strv_uniq(dirs)) {
5007 r = -ENOMEM;
5008 goto finish;
5009 }
5010
5011 fh = hashmap_new(string_hash_func, string_compare_func);
5012 if (!fh) {
5013 r = -ENOMEM;
5014 goto finish;
5015 }
5016
5017 STRV_FOREACH(p, dirs) {
5018 if (files_add(fh, *p, suffix) < 0) {
5019 log_error("Failed to search for files.");
5020 r = -EINVAL;
5021 goto finish;
5022 }
5023 }
5024
5025 files = hashmap_get_strv(fh);
5026 if (files == NULL) {
5027 log_error("Failed to compose list of files.");
5028 r = -ENOMEM;
5029 goto finish;
5030 }
5031
5032 qsort(files, hashmap_size(fh), sizeof(char *), base_cmp);
5033
5034 finish:
5035 strv_free(dirs);
5036 hashmap_free(fh);
5037 *strv = files;
5038 return r;
5039 }
5040
5041 int hwclock_is_localtime(void) {
5042 FILE *f;
5043 bool local = false;
5044
5045 /*
5046 * The third line of adjtime is "UTC" or "LOCAL" or nothing.
5047 * # /etc/adjtime
5048 * 0.0 0 0
5049 * 0
5050 * UTC
5051 */
5052 f = fopen("/etc/adjtime", "re");
5053 if (f) {
5054 char line[LINE_MAX];
5055 bool b;
5056
5057 b = fgets(line, sizeof(line), f) &&
5058 fgets(line, sizeof(line), f) &&
5059 fgets(line, sizeof(line), f);
5060
5061 fclose(f);
5062
5063 if (!b)
5064 return -EIO;
5065
5066
5067 truncate_nl(line);
5068 local = streq(line, "LOCAL");
5069
5070 } else if (errno != -ENOENT)
5071 return -errno;
5072
5073 return local;
5074 }
5075
5076 int hwclock_apply_localtime_delta(int *min) {
5077 const struct timeval *tv_null = NULL;
5078 struct timespec ts;
5079 struct tm *tm;
5080 int minuteswest;
5081 struct timezone tz;
5082
5083 assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
5084 assert_se(tm = localtime(&ts.tv_sec));
5085 minuteswest = tm->tm_gmtoff / 60;
5086
5087 tz.tz_minuteswest = -minuteswest;
5088 tz.tz_dsttime = 0; /* DST_NONE*/
5089
5090 /*
5091 * If the hardware clock does not run in UTC, but in local time:
5092 * The very first time we set the kernel's timezone, it will warp
5093 * the clock so that it runs in UTC instead of local time.
5094 */
5095 if (settimeofday(tv_null, &tz) < 0)
5096 return -errno;
5097 if (min)
5098 *min = minuteswest;
5099 return 0;
5100 }
5101
5102 int hwclock_reset_localtime_delta(void) {
5103 const struct timeval *tv_null = NULL;
5104 struct timezone tz;
5105
5106 tz.tz_minuteswest = 0;
5107 tz.tz_dsttime = 0; /* DST_NONE*/
5108
5109 if (settimeofday(tv_null, &tz) < 0)
5110 return -errno;
5111
5112 return 0;
5113 }
5114
5115 int rtc_open(int flags) {
5116 int fd;
5117 DIR *d;
5118
5119 /* First, we try to make use of the /dev/rtc symlink. If that
5120 * doesn't exist, we open the first RTC which has hctosys=1
5121 * set. If we don't find any we just take the first RTC that
5122 * exists at all. */
5123
5124 fd = open("/dev/rtc", flags);
5125 if (fd >= 0)
5126 return fd;
5127
5128 d = opendir("/sys/class/rtc");
5129 if (!d)
5130 goto fallback;
5131
5132 for (;;) {
5133 char *p, *v;
5134 struct dirent buf, *de;
5135 int r;
5136
5137 r = readdir_r(d, &buf, &de);
5138 if (r != 0)
5139 goto fallback;
5140
5141 if (!de)
5142 goto fallback;
5143
5144 if (ignore_file(de->d_name))
5145 continue;
5146
5147 p = join("/sys/class/rtc/", de->d_name, "/hctosys", NULL);
5148 if (!p) {
5149 closedir(d);
5150 return -ENOMEM;
5151 }
5152
5153 r = read_one_line_file(p, &v);
5154 free(p);
5155
5156 if (r < 0)
5157 continue;
5158
5159 r = parse_boolean(v);
5160 free(v);
5161
5162 if (r <= 0)
5163 continue;
5164
5165 p = strappend("/dev/", de->d_name);
5166 fd = open(p, flags);
5167 free(p);
5168
5169 if (fd >= 0) {
5170 closedir(d);
5171 return fd;
5172 }
5173 }
5174
5175 fallback:
5176 if (d)
5177 closedir(d);
5178
5179 fd = open("/dev/rtc0", flags);
5180 if (fd < 0)
5181 return -errno;
5182
5183 return fd;
5184 }
5185
5186 int hwclock_get_time(struct tm *tm) {
5187 int fd;
5188 int err = 0;
5189
5190 assert(tm);
5191
5192 fd = rtc_open(O_RDONLY|O_CLOEXEC);
5193 if (fd < 0)
5194 return -errno;
5195
5196 /* This leaves the timezone fields of struct tm
5197 * uninitialized! */
5198 if (ioctl(fd, RTC_RD_TIME, tm) < 0)
5199 err = -errno;
5200
5201 /* We don't now daylight saving, so we reset this in order not
5202 * to confused mktime(). */
5203 tm->tm_isdst = -1;
5204
5205 close_nointr_nofail(fd);
5206
5207 return err;
5208 }
5209
5210 int hwclock_set_time(const struct tm *tm) {
5211 int fd;
5212 int err = 0;
5213
5214 assert(tm);
5215
5216 fd = rtc_open(O_RDONLY|O_CLOEXEC);
5217 if (fd < 0)
5218 return -errno;
5219
5220 if (ioctl(fd, RTC_SET_TIME, tm) < 0)
5221 err = -errno;
5222
5223 close_nointr_nofail(fd);
5224
5225 return err;
5226 }
5227
5228 int copy_file(const char *from, const char *to) {
5229 int r, fdf, fdt;
5230
5231 assert(from);
5232 assert(to);
5233
5234 fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY);
5235 if (fdf < 0)
5236 return -errno;
5237
5238 fdt = open(to, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY, 0644);
5239 if (fdt < 0) {
5240 close_nointr_nofail(fdf);
5241 return -errno;
5242 }
5243
5244 for (;;) {
5245 char buf[PIPE_BUF];
5246 ssize_t n, k;
5247
5248 n = read(fdf, buf, sizeof(buf));
5249 if (n < 0) {
5250 r = -errno;
5251
5252 close_nointr_nofail(fdf);
5253 close_nointr(fdt);
5254 unlink(to);
5255
5256 return r;
5257 }
5258
5259 if (n == 0)
5260 break;
5261
5262 errno = 0;
5263 k = loop_write(fdt, buf, n, false);
5264 if (n != k) {
5265 r = k < 0 ? k : (errno ? -errno : -EIO);
5266
5267 close_nointr_nofail(fdf);
5268 close_nointr(fdt);
5269
5270 unlink(to);
5271 return r;
5272 }
5273 }
5274
5275 close_nointr_nofail(fdf);
5276 r = close_nointr(fdt);
5277
5278 if (r < 0) {
5279 unlink(to);
5280 return r;
5281 }
5282
5283 return 0;
5284 }
5285
5286 int symlink_or_copy(const char *from, const char *to) {
5287 char *pf = NULL, *pt = NULL;
5288 struct stat a, b;
5289 int r;
5290
5291 assert(from);
5292 assert(to);
5293
5294 if (parent_of_path(from, &pf) < 0 ||
5295 parent_of_path(to, &pt) < 0) {
5296 r = -ENOMEM;
5297 goto finish;
5298 }
5299
5300 if (stat(pf, &a) < 0 ||
5301 stat(pt, &b) < 0) {
5302 r = -errno;
5303 goto finish;
5304 }
5305
5306 if (a.st_dev != b.st_dev) {
5307 free(pf);
5308 free(pt);
5309
5310 return copy_file(from, to);
5311 }
5312
5313 if (symlink(from, to) < 0) {
5314 r = -errno;
5315 goto finish;
5316 }
5317
5318 r = 0;
5319
5320 finish:
5321 free(pf);
5322 free(pt);
5323
5324 return r;
5325 }
5326
5327 int symlink_or_copy_atomic(const char *from, const char *to) {
5328 char *t, *x;
5329 const char *fn;
5330 size_t k;
5331 unsigned long long ull;
5332 unsigned i;
5333 int r;
5334
5335 assert(from);
5336 assert(to);
5337
5338 t = new(char, strlen(to) + 1 + 16 + 1);
5339 if (!t)
5340 return -ENOMEM;
5341
5342 fn = file_name_from_path(to);
5343 k = fn-to;
5344 memcpy(t, to, k);
5345 t[k] = '.';
5346 x = stpcpy(t+k+1, fn);
5347
5348 ull = random_ull();
5349 for (i = 0; i < 16; i++) {
5350 *(x++) = hexchar(ull & 0xF);
5351 ull >>= 4;
5352 }
5353
5354 *x = 0;
5355
5356 r = symlink_or_copy(from, t);
5357 if (r < 0) {
5358 unlink(t);
5359 free(t);
5360 return r;
5361 }
5362
5363 if (rename(t, to) < 0) {
5364 r = -errno;
5365 unlink(t);
5366 free(t);
5367 return r;
5368 }
5369
5370 free(t);
5371 return r;
5372 }
5373
5374 int audit_session_from_pid(pid_t pid, uint32_t *id) {
5375 char *s;
5376 uint32_t u;
5377 int r;
5378
5379 assert(id);
5380
5381 if (have_effective_cap(CAP_AUDIT_CONTROL) <= 0)
5382 return -ENOENT;
5383
5384 if (pid == 0)
5385 r = read_one_line_file("/proc/self/sessionid", &s);
5386 else {
5387 char *p;
5388
5389 if (asprintf(&p, "/proc/%lu/sessionid", (unsigned long) pid) < 0)
5390 return -ENOMEM;
5391
5392 r = read_one_line_file(p, &s);
5393 free(p);
5394 }
5395
5396 if (r < 0)
5397 return r;
5398
5399 r = safe_atou32(s, &u);
5400 free(s);
5401
5402 if (r < 0)
5403 return r;
5404
5405 if (u == (uint32_t) -1 || u <= 0)
5406 return -ENOENT;
5407
5408 *id = u;
5409 return 0;
5410 }
5411
5412 int audit_loginuid_from_pid(pid_t pid, uid_t *uid) {
5413 char *s;
5414 uid_t u;
5415 int r;
5416
5417 assert(uid);
5418
5419 /* Only use audit login uid if we are executed with sufficient
5420 * capabilities so that pam_loginuid could do its job. If we
5421 * are lacking the CAP_AUDIT_CONTROL capabality we most likely
5422 * are being run in a container and /proc/self/loginuid is
5423 * useless since it probably contains a uid of the host
5424 * system. */
5425
5426 if (have_effective_cap(CAP_AUDIT_CONTROL) <= 0)
5427 return -ENOENT;
5428
5429 if (pid == 0)
5430 r = read_one_line_file("/proc/self/loginuid", &s);
5431 else {
5432 char *p;
5433
5434 if (asprintf(&p, "/proc/%lu/loginuid", (unsigned long) pid) < 0)
5435 return -ENOMEM;
5436
5437 r = read_one_line_file(p, &s);
5438 free(p);
5439 }
5440
5441 if (r < 0)
5442 return r;
5443
5444 r = parse_uid(s, &u);
5445 free(s);
5446
5447 if (r < 0)
5448 return r;
5449
5450 if (u == (uid_t) -1)
5451 return -ENOENT;
5452
5453 *uid = (uid_t) u;
5454 return 0;
5455 }
5456
5457 bool display_is_local(const char *display) {
5458 assert(display);
5459
5460 return
5461 display[0] == ':' &&
5462 display[1] >= '0' &&
5463 display[1] <= '9';
5464 }
5465
5466 int socket_from_display(const char *display, char **path) {
5467 size_t k;
5468 char *f, *c;
5469
5470 assert(display);
5471 assert(path);
5472
5473 if (!display_is_local(display))
5474 return -EINVAL;
5475
5476 k = strspn(display+1, "0123456789");
5477
5478 f = new(char, sizeof("/tmp/.X11-unix/X") + k);
5479 if (!f)
5480 return -ENOMEM;
5481
5482 c = stpcpy(f, "/tmp/.X11-unix/X");
5483 memcpy(c, display+1, k);
5484 c[k] = 0;
5485
5486 *path = f;
5487
5488 return 0;
5489 }
5490
5491 int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home) {
5492 struct passwd *p;
5493 uid_t u;
5494
5495 assert(username);
5496 assert(*username);
5497
5498 /* We enforce some special rules for uid=0: in order to avoid
5499 * NSS lookups for root we hardcode its data. */
5500
5501 if (streq(*username, "root") || streq(*username, "0")) {
5502 *username = "root";
5503
5504 if (uid)
5505 *uid = 0;
5506
5507 if (gid)
5508 *gid = 0;
5509
5510 if (home)
5511 *home = "/root";
5512 return 0;
5513 }
5514
5515 if (parse_uid(*username, &u) >= 0) {
5516 errno = 0;
5517 p = getpwuid(u);
5518
5519 /* If there are multiple users with the same id, make
5520 * sure to leave $USER to the configured value instead
5521 * of the first occurrence in the database. However if
5522 * the uid was configured by a numeric uid, then let's
5523 * pick the real username from /etc/passwd. */
5524 if (p)
5525 *username = p->pw_name;
5526 } else {
5527 errno = 0;
5528 p = getpwnam(*username);
5529 }
5530
5531 if (!p)
5532 return errno != 0 ? -errno : -ESRCH;
5533
5534 if (uid)
5535 *uid = p->pw_uid;
5536
5537 if (gid)
5538 *gid = p->pw_gid;
5539
5540 if (home)
5541 *home = p->pw_dir;
5542
5543 return 0;
5544 }
5545
5546 int get_group_creds(const char **groupname, gid_t *gid) {
5547 struct group *g;
5548 gid_t id;
5549
5550 assert(groupname);
5551
5552 /* We enforce some special rules for gid=0: in order to avoid
5553 * NSS lookups for root we hardcode its data. */
5554
5555 if (streq(*groupname, "root") || streq(*groupname, "0")) {
5556 *groupname = "root";
5557
5558 if (gid)
5559 *gid = 0;
5560
5561 return 0;
5562 }
5563
5564 if (parse_gid(*groupname, &id) >= 0) {
5565 errno = 0;
5566 g = getgrgid(id);
5567
5568 if (g)
5569 *groupname = g->gr_name;
5570 } else {
5571 errno = 0;
5572 g = getgrnam(*groupname);
5573 }
5574
5575 if (!g)
5576 return errno != 0 ? -errno : -ESRCH;
5577
5578 if (gid)
5579 *gid = g->gr_gid;
5580
5581 return 0;
5582 }
5583
5584 int glob_exists(const char *path) {
5585 glob_t g;
5586 int r, k;
5587
5588 assert(path);
5589
5590 zero(g);
5591 errno = 0;
5592 k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g);
5593
5594 if (k == GLOB_NOMATCH)
5595 r = 0;
5596 else if (k == GLOB_NOSPACE)
5597 r = -ENOMEM;
5598 else if (k == 0)
5599 r = !strv_isempty(g.gl_pathv);
5600 else
5601 r = errno ? -errno : -EIO;
5602
5603 globfree(&g);
5604
5605 return r;
5606 }
5607
5608 int dirent_ensure_type(DIR *d, struct dirent *de) {
5609 struct stat st;
5610
5611 assert(d);
5612 assert(de);
5613
5614 if (de->d_type != DT_UNKNOWN)
5615 return 0;
5616
5617 if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
5618 return -errno;
5619
5620 de->d_type =
5621 S_ISREG(st.st_mode) ? DT_REG :
5622 S_ISDIR(st.st_mode) ? DT_DIR :
5623 S_ISLNK(st.st_mode) ? DT_LNK :
5624 S_ISFIFO(st.st_mode) ? DT_FIFO :
5625 S_ISSOCK(st.st_mode) ? DT_SOCK :
5626 S_ISCHR(st.st_mode) ? DT_CHR :
5627 S_ISBLK(st.st_mode) ? DT_BLK :
5628 DT_UNKNOWN;
5629
5630 return 0;
5631 }
5632
5633 int in_search_path(const char *path, char **search) {
5634 char **i, *parent;
5635 int r;
5636
5637 r = parent_of_path(path, &parent);
5638 if (r < 0)
5639 return r;
5640
5641 r = 0;
5642
5643 STRV_FOREACH(i, search) {
5644 if (path_equal(parent, *i)) {
5645 r = 1;
5646 break;
5647 }
5648 }
5649
5650 free(parent);
5651
5652 return r;
5653 }
5654
5655 int get_files_in_directory(const char *path, char ***list) {
5656 DIR *d;
5657 int r = 0;
5658 unsigned n = 0;
5659 char **l = NULL;
5660
5661 assert(path);
5662
5663 /* Returns all files in a directory in *list, and the number
5664 * of files as return value. If list is NULL returns only the
5665 * number */
5666
5667 d = opendir(path);
5668 if (!d)
5669 return -errno;
5670
5671 for (;;) {
5672 struct dirent buffer, *de;
5673 int k;
5674
5675 k = readdir_r(d, &buffer, &de);
5676 if (k != 0) {
5677 r = -k;
5678 goto finish;
5679 }
5680
5681 if (!de)
5682 break;
5683
5684 dirent_ensure_type(d, de);
5685
5686 if (!dirent_is_file(de))
5687 continue;
5688
5689 if (list) {
5690 if ((unsigned) r >= n) {
5691 char **t;
5692
5693 n = MAX(16, 2*r);
5694 t = realloc(l, sizeof(char*) * n);
5695 if (!t) {
5696 r = -ENOMEM;
5697 goto finish;
5698 }
5699
5700 l = t;
5701 }
5702
5703 assert((unsigned) r < n);
5704
5705 l[r] = strdup(de->d_name);
5706 if (!l[r]) {
5707 r = -ENOMEM;
5708 goto finish;
5709 }
5710
5711 l[++r] = NULL;
5712 } else
5713 r++;
5714 }
5715
5716 finish:
5717 if (d)
5718 closedir(d);
5719
5720 if (r >= 0) {
5721 if (list)
5722 *list = l;
5723 } else
5724 strv_free(l);
5725
5726 return r;
5727 }
5728
5729 char *join(const char *x, ...) {
5730 va_list ap;
5731 size_t l;
5732 char *r, *p;
5733
5734 va_start(ap, x);
5735
5736 if (x) {
5737 l = strlen(x);
5738
5739 for (;;) {
5740 const char *t;
5741
5742 t = va_arg(ap, const char *);
5743 if (!t)
5744 break;
5745
5746 l += strlen(t);
5747 }
5748 } else
5749 l = 0;
5750
5751 va_end(ap);
5752
5753 r = new(char, l+1);
5754 if (!r)
5755 return NULL;
5756
5757 if (x) {
5758 p = stpcpy(r, x);
5759
5760 va_start(ap, x);
5761
5762 for (;;) {
5763 const char *t;
5764
5765 t = va_arg(ap, const char *);
5766 if (!t)
5767 break;
5768
5769 p = stpcpy(p, t);
5770 }
5771
5772 va_end(ap);
5773 } else
5774 r[0] = 0;
5775
5776 return r;
5777 }
5778
5779 bool is_main_thread(void) {
5780 static __thread int cached = 0;
5781
5782 if (_unlikely_(cached == 0))
5783 cached = getpid() == gettid() ? 1 : -1;
5784
5785 return cached > 0;
5786 }
5787
5788 int block_get_whole_disk(dev_t d, dev_t *ret) {
5789 char *p, *s;
5790 int r;
5791 unsigned n, m;
5792
5793 assert(ret);
5794
5795 /* If it has a queue this is good enough for us */
5796 if (asprintf(&p, "/sys/dev/block/%u:%u/queue", major(d), minor(d)) < 0)
5797 return -ENOMEM;
5798
5799 r = access(p, F_OK);
5800 free(p);
5801
5802 if (r >= 0) {
5803 *ret = d;
5804 return 0;
5805 }
5806
5807 /* If it is a partition find the originating device */
5808 if (asprintf(&p, "/sys/dev/block/%u:%u/partition", major(d), minor(d)) < 0)
5809 return -ENOMEM;
5810
5811 r = access(p, F_OK);
5812 free(p);
5813
5814 if (r < 0)
5815 return -ENOENT;
5816
5817 /* Get parent dev_t */
5818 if (asprintf(&p, "/sys/dev/block/%u:%u/../dev", major(d), minor(d)) < 0)
5819 return -ENOMEM;
5820
5821 r = read_one_line_file(p, &s);
5822 free(p);
5823
5824 if (r < 0)
5825 return r;
5826
5827 r = sscanf(s, "%u:%u", &m, &n);
5828 free(s);
5829
5830 if (r != 2)
5831 return -EINVAL;
5832
5833 /* Only return this if it is really good enough for us. */
5834 if (asprintf(&p, "/sys/dev/block/%u:%u/queue", m, n) < 0)
5835 return -ENOMEM;
5836
5837 r = access(p, F_OK);
5838 free(p);
5839
5840 if (r >= 0) {
5841 *ret = makedev(m, n);
5842 return 0;
5843 }
5844
5845 return -ENOENT;
5846 }
5847
5848 int file_is_priv_sticky(const char *p) {
5849 struct stat st;
5850
5851 assert(p);
5852
5853 if (lstat(p, &st) < 0)
5854 return -errno;
5855
5856 return
5857 (st.st_uid == 0 || st.st_uid == getuid()) &&
5858 (st.st_mode & S_ISVTX);
5859 }
5860
5861 static const char *const ioprio_class_table[] = {
5862 [IOPRIO_CLASS_NONE] = "none",
5863 [IOPRIO_CLASS_RT] = "realtime",
5864 [IOPRIO_CLASS_BE] = "best-effort",
5865 [IOPRIO_CLASS_IDLE] = "idle"
5866 };
5867
5868 DEFINE_STRING_TABLE_LOOKUP(ioprio_class, int);
5869
5870 static const char *const sigchld_code_table[] = {
5871 [CLD_EXITED] = "exited",
5872 [CLD_KILLED] = "killed",
5873 [CLD_DUMPED] = "dumped",
5874 [CLD_TRAPPED] = "trapped",
5875 [CLD_STOPPED] = "stopped",
5876 [CLD_CONTINUED] = "continued",
5877 };
5878
5879 DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
5880
5881 static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = {
5882 [LOG_FAC(LOG_KERN)] = "kern",
5883 [LOG_FAC(LOG_USER)] = "user",
5884 [LOG_FAC(LOG_MAIL)] = "mail",
5885 [LOG_FAC(LOG_DAEMON)] = "daemon",
5886 [LOG_FAC(LOG_AUTH)] = "auth",
5887 [LOG_FAC(LOG_SYSLOG)] = "syslog",
5888 [LOG_FAC(LOG_LPR)] = "lpr",
5889 [LOG_FAC(LOG_NEWS)] = "news",
5890 [LOG_FAC(LOG_UUCP)] = "uucp",
5891 [LOG_FAC(LOG_CRON)] = "cron",
5892 [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
5893 [LOG_FAC(LOG_FTP)] = "ftp",
5894 [LOG_FAC(LOG_LOCAL0)] = "local0",
5895 [LOG_FAC(LOG_LOCAL1)] = "local1",
5896 [LOG_FAC(LOG_LOCAL2)] = "local2",
5897 [LOG_FAC(LOG_LOCAL3)] = "local3",
5898 [LOG_FAC(LOG_LOCAL4)] = "local4",
5899 [LOG_FAC(LOG_LOCAL5)] = "local5",
5900 [LOG_FAC(LOG_LOCAL6)] = "local6",
5901 [LOG_FAC(LOG_LOCAL7)] = "local7"
5902 };
5903
5904 DEFINE_STRING_TABLE_LOOKUP(log_facility_unshifted, int);
5905
5906 static const char *const log_level_table[] = {
5907 [LOG_EMERG] = "emerg",
5908 [LOG_ALERT] = "alert",
5909 [LOG_CRIT] = "crit",
5910 [LOG_ERR] = "err",
5911 [LOG_WARNING] = "warning",
5912 [LOG_NOTICE] = "notice",
5913 [LOG_INFO] = "info",
5914 [LOG_DEBUG] = "debug"
5915 };
5916
5917 DEFINE_STRING_TABLE_LOOKUP(log_level, int);
5918
5919 static const char* const sched_policy_table[] = {
5920 [SCHED_OTHER] = "other",
5921 [SCHED_BATCH] = "batch",
5922 [SCHED_IDLE] = "idle",
5923 [SCHED_FIFO] = "fifo",
5924 [SCHED_RR] = "rr"
5925 };
5926
5927 DEFINE_STRING_TABLE_LOOKUP(sched_policy, int);
5928
5929 static const char* const rlimit_table[] = {
5930 [RLIMIT_CPU] = "LimitCPU",
5931 [RLIMIT_FSIZE] = "LimitFSIZE",
5932 [RLIMIT_DATA] = "LimitDATA",
5933 [RLIMIT_STACK] = "LimitSTACK",
5934 [RLIMIT_CORE] = "LimitCORE",
5935 [RLIMIT_RSS] = "LimitRSS",
5936 [RLIMIT_NOFILE] = "LimitNOFILE",
5937 [RLIMIT_AS] = "LimitAS",
5938 [RLIMIT_NPROC] = "LimitNPROC",
5939 [RLIMIT_MEMLOCK] = "LimitMEMLOCK",
5940 [RLIMIT_LOCKS] = "LimitLOCKS",
5941 [RLIMIT_SIGPENDING] = "LimitSIGPENDING",
5942 [RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
5943 [RLIMIT_NICE] = "LimitNICE",
5944 [RLIMIT_RTPRIO] = "LimitRTPRIO",
5945 [RLIMIT_RTTIME] = "LimitRTTIME"
5946 };
5947
5948 DEFINE_STRING_TABLE_LOOKUP(rlimit, int);
5949
5950 static const char* const ip_tos_table[] = {
5951 [IPTOS_LOWDELAY] = "low-delay",
5952 [IPTOS_THROUGHPUT] = "throughput",
5953 [IPTOS_RELIABILITY] = "reliability",
5954 [IPTOS_LOWCOST] = "low-cost",
5955 };
5956
5957 DEFINE_STRING_TABLE_LOOKUP(ip_tos, int);
5958
5959 static const char *const __signal_table[] = {
5960 [SIGHUP] = "HUP",
5961 [SIGINT] = "INT",
5962 [SIGQUIT] = "QUIT",
5963 [SIGILL] = "ILL",
5964 [SIGTRAP] = "TRAP",
5965 [SIGABRT] = "ABRT",
5966 [SIGBUS] = "BUS",
5967 [SIGFPE] = "FPE",
5968 [SIGKILL] = "KILL",
5969 [SIGUSR1] = "USR1",
5970 [SIGSEGV] = "SEGV",
5971 [SIGUSR2] = "USR2",
5972 [SIGPIPE] = "PIPE",
5973 [SIGALRM] = "ALRM",
5974 [SIGTERM] = "TERM",
5975 #ifdef SIGSTKFLT
5976 [SIGSTKFLT] = "STKFLT", /* Linux on SPARC doesn't know SIGSTKFLT */
5977 #endif
5978 [SIGCHLD] = "CHLD",
5979 [SIGCONT] = "CONT",
5980 [SIGSTOP] = "STOP",
5981 [SIGTSTP] = "TSTP",
5982 [SIGTTIN] = "TTIN",
5983 [SIGTTOU] = "TTOU",
5984 [SIGURG] = "URG",
5985 [SIGXCPU] = "XCPU",
5986 [SIGXFSZ] = "XFSZ",
5987 [SIGVTALRM] = "VTALRM",
5988 [SIGPROF] = "PROF",
5989 [SIGWINCH] = "WINCH",
5990 [SIGIO] = "IO",
5991 [SIGPWR] = "PWR",
5992 [SIGSYS] = "SYS"
5993 };
5994
5995 DEFINE_PRIVATE_STRING_TABLE_LOOKUP(__signal, int);
5996
5997 const char *signal_to_string(int signo) {
5998 static __thread char buf[12];
5999 const char *name;
6000
6001 name = __signal_to_string(signo);
6002 if (name)
6003 return name;
6004
6005 if (signo >= SIGRTMIN && signo <= SIGRTMAX)
6006 snprintf(buf, sizeof(buf) - 1, "RTMIN+%d", signo - SIGRTMIN);
6007 else
6008 snprintf(buf, sizeof(buf) - 1, "%d", signo);
6009 char_array_0(buf);
6010 return buf;
6011 }
6012
6013 int signal_from_string(const char *s) {
6014 int signo;
6015 int offset = 0;
6016 unsigned u;
6017
6018 signo =__signal_from_string(s);
6019 if (signo > 0)
6020 return signo;
6021
6022 if (startswith(s, "RTMIN+")) {
6023 s += 6;
6024 offset = SIGRTMIN;
6025 }
6026 if (safe_atou(s, &u) >= 0) {
6027 signo = (int) u + offset;
6028 if (signo > 0 && signo < _NSIG)
6029 return signo;
6030 }
6031 return -1;
6032 }
6033
6034 bool kexec_loaded(void) {
6035 bool loaded = false;
6036 char *s;
6037
6038 if (read_one_line_file("/sys/kernel/kexec_loaded", &s) >= 0) {
6039 if (s[0] == '1')
6040 loaded = true;
6041 free(s);
6042 }
6043 return loaded;
6044 }
6045
6046 int strdup_or_null(const char *a, char **b) {
6047 char *c;
6048
6049 assert(b);
6050
6051 if (!a) {
6052 *b = NULL;
6053 return 0;
6054 }
6055
6056 c = strdup(a);
6057 if (!c)
6058 return -ENOMEM;
6059
6060 *b = c;
6061 return 0;
6062 }
6063
6064 int prot_from_flags(int flags) {
6065
6066 switch (flags & O_ACCMODE) {
6067
6068 case O_RDONLY:
6069 return PROT_READ;
6070
6071 case O_WRONLY:
6072 return PROT_WRITE;
6073
6074 case O_RDWR:
6075 return PROT_READ|PROT_WRITE;
6076
6077 default:
6078 return -EINVAL;
6079 }
6080 }
6081
6082 unsigned long cap_last_cap(void) {
6083 static __thread unsigned long saved;
6084 static __thread bool valid = false;
6085 unsigned long p;
6086
6087 if (valid)
6088 return saved;
6089
6090 p = (unsigned long) CAP_LAST_CAP;
6091
6092 if (prctl(PR_CAPBSET_READ, p) < 0) {
6093
6094 /* Hmm, look downwards, until we find one that
6095 * works */
6096 for (p--; p > 0; p --)
6097 if (prctl(PR_CAPBSET_READ, p) >= 0)
6098 break;
6099
6100 } else {
6101
6102 /* Hmm, look upwards, until we find one that doesn't
6103 * work */
6104 for (;; p++)
6105 if (prctl(PR_CAPBSET_READ, p+1) < 0)
6106 break;
6107 }
6108
6109 saved = p;
6110 valid = true;
6111
6112 return p;
6113 }
6114
6115 char *format_bytes(char *buf, size_t l, off_t t) {
6116 unsigned i;
6117
6118 static const struct {
6119 const char *suffix;
6120 off_t factor;
6121 } table[] = {
6122 { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
6123 { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
6124 { "T", 1024ULL*1024ULL*1024ULL*1024ULL },
6125 { "G", 1024ULL*1024ULL*1024ULL },
6126 { "M", 1024ULL*1024ULL },
6127 { "K", 1024ULL },
6128 };
6129
6130 for (i = 0; i < ELEMENTSOF(table); i++) {
6131
6132 if (t >= table[i].factor) {
6133 snprintf(buf, l,
6134 "%llu.%llu%s",
6135 (unsigned long long) (t / table[i].factor),
6136 (unsigned long long) (((t*10ULL) / table[i].factor) % 10ULL),
6137 table[i].suffix);
6138
6139 goto finish;
6140 }
6141 }
6142
6143 snprintf(buf, l, "%lluB", (unsigned long long) t);
6144
6145 finish:
6146 buf[l-1] = 0;
6147 return buf;
6148
6149 }
6150
6151 void* memdup(const void *p, size_t l) {
6152 void *r;
6153
6154 assert(p);
6155
6156 r = malloc(l);
6157 if (!r)
6158 return NULL;
6159
6160 memcpy(r, p, l);
6161 return r;
6162 }
6163
6164 int fd_inc_sndbuf(int fd, size_t n) {
6165 int r, value;
6166 socklen_t l = sizeof(value);
6167
6168 r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l);
6169 if (r >= 0 &&
6170 l == sizeof(value) &&
6171 (size_t) value >= n*2)
6172 return 0;
6173
6174 value = (int) n;
6175 r = setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value));
6176 if (r < 0)
6177 return -errno;
6178
6179 return 1;
6180 }
6181
6182 int fd_inc_rcvbuf(int fd, size_t n) {
6183 int r, value;
6184 socklen_t l = sizeof(value);
6185
6186 r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l);
6187 if (r >= 0 &&
6188 l == sizeof(value) &&
6189 (size_t) value >= n*2)
6190 return 0;
6191
6192 value = (int) n;
6193 r = setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value));
6194 if (r < 0)
6195 return -errno;
6196
6197 return 1;
6198 }
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