]>
Commit | Line | Data |
---|---|---|
288a74cc RC |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
11c3a366 | 20 | #include <errno.h> |
07630cea | 21 | #include <fcntl.h> |
11c3a366 TA |
22 | #include <limits.h> |
23 | #include <stdarg.h> | |
24 | #include <stddef.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <sys/inotify.h> | |
28 | #include <sys/socket.h> | |
29 | #include <sys/sysmacros.h> | |
30 | #include <sys/time.h> | |
07630cea LP |
31 | #include <linux/kd.h> |
32 | #include <linux/tiocl.h> | |
33 | #include <linux/vt.h> | |
34 | #include <poll.h> | |
35 | #include <signal.h> | |
288a74cc | 36 | #include <sys/ioctl.h> |
07630cea | 37 | #include <sys/types.h> |
288a74cc | 38 | #include <termios.h> |
07630cea | 39 | #include <unistd.h> |
288a74cc | 40 | |
b5efdb8a | 41 | #include "alloc-util.h" |
acf553b0 | 42 | #include "env-util.h" |
3ffd4af2 | 43 | #include "fd-util.h" |
288a74cc | 44 | #include "fileio.h" |
f4f15635 | 45 | #include "fs-util.h" |
c004493c | 46 | #include "io-util.h" |
93cc7779 TA |
47 | #include "log.h" |
48 | #include "macro.h" | |
6bedfcbb | 49 | #include "parse-util.h" |
07630cea | 50 | #include "process-util.h" |
2583fbea | 51 | #include "socket-util.h" |
8fcde012 | 52 | #include "stat-util.h" |
07630cea | 53 | #include "string-util.h" |
6af62124 | 54 | #include "strv.h" |
3ffd4af2 | 55 | #include "terminal-util.h" |
07630cea LP |
56 | #include "time-util.h" |
57 | #include "util.h" | |
288a74cc RC |
58 | |
59 | static volatile unsigned cached_columns = 0; | |
60 | static volatile unsigned cached_lines = 0; | |
61 | ||
62 | int chvt(int vt) { | |
63 | _cleanup_close_ int fd; | |
64 | ||
0a8b555c | 65 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
66 | if (fd < 0) |
67 | return -errno; | |
68 | ||
b9e74c39 | 69 | if (vt <= 0) { |
288a74cc RC |
70 | int tiocl[2] = { |
71 | TIOCL_GETKMSGREDIRECT, | |
72 | 0 | |
73 | }; | |
74 | ||
75 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
76 | return -errno; | |
77 | ||
78 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
79 | } | |
80 | ||
81 | if (ioctl(fd, VT_ACTIVATE, vt) < 0) | |
82 | return -errno; | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { | |
88 | struct termios old_termios, new_termios; | |
89 | char c, line[LINE_MAX]; | |
90 | ||
91 | assert(f); | |
92 | assert(ret); | |
93 | ||
94 | if (tcgetattr(fileno(f), &old_termios) >= 0) { | |
95 | new_termios = old_termios; | |
96 | ||
97 | new_termios.c_lflag &= ~ICANON; | |
98 | new_termios.c_cc[VMIN] = 1; | |
99 | new_termios.c_cc[VTIME] = 0; | |
100 | ||
101 | if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) { | |
102 | size_t k; | |
103 | ||
104 | if (t != USEC_INFINITY) { | |
105 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) { | |
106 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
107 | return -ETIMEDOUT; | |
108 | } | |
109 | } | |
110 | ||
111 | k = fread(&c, 1, 1, f); | |
112 | ||
113 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
114 | ||
115 | if (k <= 0) | |
116 | return -EIO; | |
117 | ||
118 | if (need_nl) | |
119 | *need_nl = c != '\n'; | |
120 | ||
121 | *ret = c; | |
122 | return 0; | |
123 | } | |
124 | } | |
125 | ||
126 | if (t != USEC_INFINITY) { | |
127 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) | |
128 | return -ETIMEDOUT; | |
129 | } | |
130 | ||
131 | errno = 0; | |
132 | if (!fgets(line, sizeof(line), f)) | |
f5e5c28f | 133 | return errno > 0 ? -errno : -EIO; |
288a74cc RC |
134 | |
135 | truncate_nl(line); | |
136 | ||
137 | if (strlen(line) != 1) | |
138 | return -EBADMSG; | |
139 | ||
140 | if (need_nl) | |
141 | *need_nl = false; | |
142 | ||
143 | *ret = line[0]; | |
144 | return 0; | |
145 | } | |
146 | ||
147 | int ask_char(char *ret, const char *replies, const char *text, ...) { | |
148 | int r; | |
149 | ||
150 | assert(ret); | |
151 | assert(replies); | |
152 | assert(text); | |
153 | ||
154 | for (;;) { | |
155 | va_list ap; | |
156 | char c; | |
157 | bool need_nl = true; | |
158 | ||
7565bb98 | 159 | if (colors_enabled()) |
1fc464f6 | 160 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc RC |
161 | |
162 | va_start(ap, text); | |
163 | vprintf(text, ap); | |
164 | va_end(ap); | |
165 | ||
7565bb98 | 166 | if (colors_enabled()) |
1fc464f6 | 167 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
168 | |
169 | fflush(stdout); | |
170 | ||
171 | r = read_one_char(stdin, &c, USEC_INFINITY, &need_nl); | |
172 | if (r < 0) { | |
173 | ||
174 | if (r == -EBADMSG) { | |
175 | puts("Bad input, please try again."); | |
176 | continue; | |
177 | } | |
178 | ||
179 | putchar('\n'); | |
180 | return r; | |
181 | } | |
182 | ||
183 | if (need_nl) | |
184 | putchar('\n'); | |
185 | ||
186 | if (strchr(replies, c)) { | |
187 | *ret = c; | |
188 | return 0; | |
189 | } | |
190 | ||
191 | puts("Read unexpected character, please try again."); | |
192 | } | |
193 | } | |
194 | ||
195 | int ask_string(char **ret, const char *text, ...) { | |
196 | assert(ret); | |
197 | assert(text); | |
198 | ||
199 | for (;;) { | |
200 | char line[LINE_MAX]; | |
201 | va_list ap; | |
202 | ||
7565bb98 | 203 | if (colors_enabled()) |
1fc464f6 | 204 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc RC |
205 | |
206 | va_start(ap, text); | |
207 | vprintf(text, ap); | |
208 | va_end(ap); | |
209 | ||
7565bb98 | 210 | if (colors_enabled()) |
1fc464f6 | 211 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
212 | |
213 | fflush(stdout); | |
214 | ||
215 | errno = 0; | |
216 | if (!fgets(line, sizeof(line), stdin)) | |
f5e5c28f | 217 | return errno > 0 ? -errno : -EIO; |
288a74cc RC |
218 | |
219 | if (!endswith(line, "\n")) | |
220 | putchar('\n'); | |
221 | else { | |
222 | char *s; | |
223 | ||
224 | if (isempty(line)) | |
225 | continue; | |
226 | ||
227 | truncate_nl(line); | |
228 | s = strdup(line); | |
229 | if (!s) | |
230 | return -ENOMEM; | |
231 | ||
232 | *ret = s; | |
233 | return 0; | |
234 | } | |
235 | } | |
236 | } | |
237 | ||
238 | int reset_terminal_fd(int fd, bool switch_to_text) { | |
239 | struct termios termios; | |
240 | int r = 0; | |
241 | ||
242 | /* Set terminal to some sane defaults */ | |
243 | ||
244 | assert(fd >= 0); | |
245 | ||
246 | /* We leave locked terminal attributes untouched, so that | |
247 | * Plymouth may set whatever it wants to set, and we don't | |
248 | * interfere with that. */ | |
249 | ||
250 | /* Disable exclusive mode, just in case */ | |
7d927c9a | 251 | (void) ioctl(fd, TIOCNXCL); |
288a74cc RC |
252 | |
253 | /* Switch to text mode */ | |
254 | if (switch_to_text) | |
7d927c9a | 255 | (void) ioctl(fd, KDSETMODE, KD_TEXT); |
288a74cc RC |
256 | |
257 | /* Enable console unicode mode */ | |
7d927c9a | 258 | (void) ioctl(fd, KDSKBMODE, K_UNICODE); |
288a74cc RC |
259 | |
260 | if (tcgetattr(fd, &termios) < 0) { | |
261 | r = -errno; | |
262 | goto finish; | |
263 | } | |
264 | ||
265 | /* We only reset the stuff that matters to the software. How | |
266 | * hardware is set up we don't touch assuming that somebody | |
267 | * else will do that for us */ | |
268 | ||
269 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
270 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
271 | termios.c_oflag |= ONLCR; | |
272 | termios.c_cflag |= CREAD; | |
273 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
274 | ||
275 | termios.c_cc[VINTR] = 03; /* ^C */ | |
276 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
277 | termios.c_cc[VERASE] = 0177; | |
278 | termios.c_cc[VKILL] = 025; /* ^X */ | |
279 | termios.c_cc[VEOF] = 04; /* ^D */ | |
280 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
281 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
282 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
283 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
284 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
285 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
286 | termios.c_cc[VEOL] = 0; | |
287 | termios.c_cc[VEOL2] = 0; | |
288 | ||
289 | termios.c_cc[VTIME] = 0; | |
290 | termios.c_cc[VMIN] = 1; | |
291 | ||
292 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
293 | r = -errno; | |
294 | ||
295 | finish: | |
296 | /* Just in case, flush all crap out */ | |
7d927c9a | 297 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
298 | |
299 | return r; | |
300 | } | |
301 | ||
302 | int reset_terminal(const char *name) { | |
303 | _cleanup_close_ int fd = -1; | |
304 | ||
0a8b555c LP |
305 | /* We open the terminal with O_NONBLOCK here, to ensure we |
306 | * don't block on carrier if this is a terminal with carrier | |
307 | * configured. */ | |
308 | ||
309 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
310 | if (fd < 0) |
311 | return fd; | |
312 | ||
313 | return reset_terminal_fd(fd, true); | |
314 | } | |
315 | ||
316 | int open_terminal(const char *name, int mode) { | |
317 | int fd, r; | |
318 | unsigned c = 0; | |
319 | ||
320 | /* | |
321 | * If a TTY is in the process of being closed opening it might | |
322 | * cause EIO. This is horribly awful, but unlikely to be | |
323 | * changed in the kernel. Hence we work around this problem by | |
324 | * retrying a couple of times. | |
325 | * | |
326 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
327 | */ | |
328 | ||
35bdab77 LP |
329 | if (mode & O_CREAT) |
330 | return -EINVAL; | |
288a74cc RC |
331 | |
332 | for (;;) { | |
333 | fd = open(name, mode, 0); | |
334 | if (fd >= 0) | |
335 | break; | |
336 | ||
337 | if (errno != EIO) | |
338 | return -errno; | |
339 | ||
340 | /* Max 1s in total */ | |
341 | if (c >= 20) | |
342 | return -errno; | |
343 | ||
344 | usleep(50 * USEC_PER_MSEC); | |
345 | c++; | |
346 | } | |
347 | ||
348 | r = isatty(fd); | |
e6c9fa74 | 349 | if (r == 0) { |
288a74cc RC |
350 | safe_close(fd); |
351 | return -ENOTTY; | |
352 | } | |
353 | ||
354 | return fd; | |
355 | } | |
356 | ||
357 | int acquire_terminal( | |
358 | const char *name, | |
359 | bool fail, | |
360 | bool force, | |
361 | bool ignore_tiocstty_eperm, | |
362 | usec_t timeout) { | |
363 | ||
364 | int fd = -1, notify = -1, r = 0, wd = -1; | |
365 | usec_t ts = 0; | |
366 | ||
367 | assert(name); | |
368 | ||
369 | /* We use inotify to be notified when the tty is closed. We | |
370 | * create the watch before checking if we can actually acquire | |
371 | * it, so that we don't lose any event. | |
372 | * | |
373 | * Note: strictly speaking this actually watches for the | |
374 | * device being closed, it does *not* really watch whether a | |
375 | * tty loses its controlling process. However, unless some | |
376 | * rogue process uses TIOCNOTTY on /dev/tty *after* closing | |
377 | * its tty otherwise this will not become a problem. As long | |
378 | * as the administrator makes sure not configure any service | |
379 | * on the same tty as an untrusted user this should not be a | |
380 | * problem. (Which he probably should not do anyway.) */ | |
381 | ||
382 | if (timeout != USEC_INFINITY) | |
383 | ts = now(CLOCK_MONOTONIC); | |
384 | ||
385 | if (!fail && !force) { | |
386 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); | |
387 | if (notify < 0) { | |
388 | r = -errno; | |
389 | goto fail; | |
390 | } | |
391 | ||
392 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
393 | if (wd < 0) { | |
394 | r = -errno; | |
395 | goto fail; | |
396 | } | |
397 | } | |
398 | ||
399 | for (;;) { | |
400 | struct sigaction sa_old, sa_new = { | |
401 | .sa_handler = SIG_IGN, | |
402 | .sa_flags = SA_RESTART, | |
403 | }; | |
404 | ||
405 | if (notify >= 0) { | |
406 | r = flush_fd(notify); | |
407 | if (r < 0) | |
408 | goto fail; | |
409 | } | |
410 | ||
411 | /* We pass here O_NOCTTY only so that we can check the return | |
412 | * value TIOCSCTTY and have a reliable way to figure out if we | |
413 | * successfully became the controlling process of the tty */ | |
414 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
415 | if (fd < 0) | |
416 | return fd; | |
417 | ||
418 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
419 | * if we already own the tty. */ | |
420 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
421 | ||
422 | /* First, try to get the tty */ | |
423 | if (ioctl(fd, TIOCSCTTY, force) < 0) | |
424 | r = -errno; | |
425 | ||
426 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
427 | ||
b938cb90 | 428 | /* Sometimes, it makes sense to ignore TIOCSCTTY |
288a74cc RC |
429 | * returning EPERM, i.e. when very likely we already |
430 | * are have this controlling terminal. */ | |
431 | if (r < 0 && r == -EPERM && ignore_tiocstty_eperm) | |
432 | r = 0; | |
433 | ||
7d927c9a | 434 | if (r < 0 && (force || fail || r != -EPERM)) |
288a74cc | 435 | goto fail; |
288a74cc RC |
436 | |
437 | if (r >= 0) | |
438 | break; | |
439 | ||
440 | assert(!fail); | |
441 | assert(!force); | |
442 | assert(notify >= 0); | |
443 | ||
444 | for (;;) { | |
445 | union inotify_event_buffer buffer; | |
446 | struct inotify_event *e; | |
447 | ssize_t l; | |
448 | ||
449 | if (timeout != USEC_INFINITY) { | |
450 | usec_t n; | |
451 | ||
452 | n = now(CLOCK_MONOTONIC); | |
453 | if (ts + timeout < n) { | |
454 | r = -ETIMEDOUT; | |
455 | goto fail; | |
456 | } | |
457 | ||
f80da6f3 | 458 | r = fd_wait_for_event(notify, POLLIN, ts + timeout - n); |
288a74cc RC |
459 | if (r < 0) |
460 | goto fail; | |
461 | ||
462 | if (r == 0) { | |
463 | r = -ETIMEDOUT; | |
464 | goto fail; | |
465 | } | |
466 | } | |
467 | ||
468 | l = read(notify, &buffer, sizeof(buffer)); | |
469 | if (l < 0) { | |
470 | if (errno == EINTR || errno == EAGAIN) | |
471 | continue; | |
472 | ||
473 | r = -errno; | |
474 | goto fail; | |
475 | } | |
476 | ||
477 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
478 | if (e->wd != wd || !(e->mask & IN_CLOSE)) { | |
479 | r = -EIO; | |
480 | goto fail; | |
481 | } | |
482 | } | |
483 | ||
484 | break; | |
485 | } | |
486 | ||
487 | /* We close the tty fd here since if the old session | |
488 | * ended our handle will be dead. It's important that | |
489 | * we do this after sleeping, so that we don't enter | |
490 | * an endless loop. */ | |
491 | fd = safe_close(fd); | |
492 | } | |
493 | ||
494 | safe_close(notify); | |
495 | ||
288a74cc RC |
496 | return fd; |
497 | ||
498 | fail: | |
499 | safe_close(fd); | |
500 | safe_close(notify); | |
501 | ||
502 | return r; | |
503 | } | |
504 | ||
505 | int release_terminal(void) { | |
506 | static const struct sigaction sa_new = { | |
507 | .sa_handler = SIG_IGN, | |
508 | .sa_flags = SA_RESTART, | |
509 | }; | |
510 | ||
511 | _cleanup_close_ int fd = -1; | |
512 | struct sigaction sa_old; | |
513 | int r = 0; | |
514 | ||
0a8b555c | 515 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
516 | if (fd < 0) |
517 | return -errno; | |
518 | ||
519 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
520 | * by our own TIOCNOTTY */ | |
521 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
522 | ||
523 | if (ioctl(fd, TIOCNOTTY) < 0) | |
524 | r = -errno; | |
525 | ||
526 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
527 | ||
528 | return r; | |
529 | } | |
530 | ||
531 | int terminal_vhangup_fd(int fd) { | |
532 | assert(fd >= 0); | |
533 | ||
534 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
535 | return -errno; | |
536 | ||
537 | return 0; | |
538 | } | |
539 | ||
540 | int terminal_vhangup(const char *name) { | |
541 | _cleanup_close_ int fd; | |
542 | ||
0a8b555c | 543 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
544 | if (fd < 0) |
545 | return fd; | |
546 | ||
547 | return terminal_vhangup_fd(fd); | |
548 | } | |
549 | ||
550 | int vt_disallocate(const char *name) { | |
1ba23931 | 551 | _cleanup_close_ int fd = -1; |
288a74cc | 552 | unsigned u; |
1ba23931 | 553 | int r; |
288a74cc RC |
554 | |
555 | /* Deallocate the VT if possible. If not possible | |
556 | * (i.e. because it is the active one), at least clear it | |
557 | * entirely (including the scrollback buffer) */ | |
558 | ||
559 | if (!startswith(name, "/dev/")) | |
560 | return -EINVAL; | |
561 | ||
562 | if (!tty_is_vc(name)) { | |
563 | /* So this is not a VT. I guess we cannot deallocate | |
564 | * it then. But let's at least clear the screen */ | |
565 | ||
566 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
567 | if (fd < 0) | |
568 | return fd; | |
569 | ||
570 | loop_write(fd, | |
571 | "\033[r" /* clear scrolling region */ | |
572 | "\033[H" /* move home */ | |
573 | "\033[2J", /* clear screen */ | |
574 | 10, false); | |
288a74cc RC |
575 | return 0; |
576 | } | |
577 | ||
578 | if (!startswith(name, "/dev/tty")) | |
579 | return -EINVAL; | |
580 | ||
581 | r = safe_atou(name+8, &u); | |
582 | if (r < 0) | |
583 | return r; | |
584 | ||
585 | if (u <= 0) | |
586 | return -EINVAL; | |
587 | ||
588 | /* Try to deallocate */ | |
0a8b555c | 589 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
590 | if (fd < 0) |
591 | return fd; | |
592 | ||
593 | r = ioctl(fd, VT_DISALLOCATE, u); | |
1ba23931 | 594 | fd = safe_close(fd); |
288a74cc RC |
595 | |
596 | if (r >= 0) | |
597 | return 0; | |
598 | ||
599 | if (errno != EBUSY) | |
600 | return -errno; | |
601 | ||
602 | /* Couldn't deallocate, so let's clear it fully with | |
603 | * scrollback */ | |
604 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
605 | if (fd < 0) | |
606 | return fd; | |
607 | ||
608 | loop_write(fd, | |
609 | "\033[r" /* clear scrolling region */ | |
610 | "\033[H" /* move home */ | |
611 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
612 | 10, false); | |
288a74cc RC |
613 | return 0; |
614 | } | |
615 | ||
288a74cc RC |
616 | int make_console_stdio(void) { |
617 | int fd, r; | |
618 | ||
619 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr */ | |
620 | ||
621 | fd = acquire_terminal("/dev/console", false, true, true, USEC_INFINITY); | |
622 | if (fd < 0) | |
623 | return log_error_errno(fd, "Failed to acquire terminal: %m"); | |
624 | ||
3d18b167 LP |
625 | r = reset_terminal_fd(fd, true); |
626 | if (r < 0) | |
627 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
628 | ||
288a74cc RC |
629 | r = make_stdio(fd); |
630 | if (r < 0) | |
631 | return log_error_errno(r, "Failed to duplicate terminal fd: %m"); | |
632 | ||
633 | return 0; | |
634 | } | |
635 | ||
288a74cc RC |
636 | bool tty_is_vc(const char *tty) { |
637 | assert(tty); | |
638 | ||
639 | return vtnr_from_tty(tty) >= 0; | |
640 | } | |
641 | ||
642 | bool tty_is_console(const char *tty) { | |
643 | assert(tty); | |
644 | ||
645 | if (startswith(tty, "/dev/")) | |
646 | tty += 5; | |
647 | ||
648 | return streq(tty, "console"); | |
649 | } | |
650 | ||
651 | int vtnr_from_tty(const char *tty) { | |
652 | int i, r; | |
653 | ||
654 | assert(tty); | |
655 | ||
656 | if (startswith(tty, "/dev/")) | |
657 | tty += 5; | |
658 | ||
659 | if (!startswith(tty, "tty") ) | |
660 | return -EINVAL; | |
661 | ||
662 | if (tty[3] < '0' || tty[3] > '9') | |
663 | return -EINVAL; | |
664 | ||
665 | r = safe_atoi(tty+3, &i); | |
666 | if (r < 0) | |
667 | return r; | |
668 | ||
669 | if (i < 0 || i > 63) | |
670 | return -EINVAL; | |
671 | ||
672 | return i; | |
673 | } | |
674 | ||
675 | char *resolve_dev_console(char **active) { | |
676 | char *tty; | |
677 | ||
678 | /* Resolve where /dev/console is pointing to, if /sys is actually ours | |
679 | * (i.e. not read-only-mounted which is a sign for container setups) */ | |
680 | ||
681 | if (path_is_read_only_fs("/sys") > 0) | |
682 | return NULL; | |
683 | ||
684 | if (read_one_line_file("/sys/class/tty/console/active", active) < 0) | |
685 | return NULL; | |
686 | ||
687 | /* If multiple log outputs are configured the last one is what | |
688 | * /dev/console points to */ | |
689 | tty = strrchr(*active, ' '); | |
690 | if (tty) | |
691 | tty++; | |
692 | else | |
693 | tty = *active; | |
694 | ||
695 | if (streq(tty, "tty0")) { | |
696 | char *tmp; | |
697 | ||
698 | /* Get the active VC (e.g. tty1) */ | |
699 | if (read_one_line_file("/sys/class/tty/tty0/active", &tmp) >= 0) { | |
700 | free(*active); | |
701 | tty = *active = tmp; | |
702 | } | |
703 | } | |
704 | ||
705 | return tty; | |
706 | } | |
707 | ||
6af62124 WF |
708 | int get_kernel_consoles(char ***consoles) { |
709 | _cleanup_strv_free_ char **con = NULL; | |
710 | _cleanup_free_ char *line = NULL; | |
711 | const char *active; | |
712 | int r; | |
713 | ||
714 | assert(consoles); | |
715 | ||
716 | r = read_one_line_file("/sys/class/tty/console/active", &line); | |
717 | if (r < 0) | |
718 | return r; | |
719 | ||
720 | active = line; | |
721 | for (;;) { | |
722 | _cleanup_free_ char *tty = NULL; | |
723 | char *path; | |
724 | ||
725 | r = extract_first_word(&active, &tty, NULL, 0); | |
726 | if (r < 0) | |
727 | return r; | |
728 | if (r == 0) | |
729 | break; | |
730 | ||
731 | if (streq(tty, "tty0")) { | |
732 | tty = mfree(tty); | |
733 | r = read_one_line_file("/sys/class/tty/tty0/active", &tty); | |
734 | if (r < 0) | |
735 | return r; | |
736 | } | |
737 | ||
738 | path = strappend("/dev/", tty); | |
739 | if (!path) | |
740 | return -ENOMEM; | |
741 | ||
742 | if (access(path, F_OK) < 0) { | |
743 | log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path); | |
744 | free(path); | |
745 | continue; | |
746 | } | |
747 | ||
748 | r = strv_consume(&con, path); | |
749 | if (r < 0) | |
750 | return r; | |
751 | } | |
752 | ||
753 | if (strv_isempty(con)) { | |
754 | log_debug("No devices found for system console"); | |
755 | ||
756 | r = strv_extend(&con, "/dev/console"); | |
757 | if (r < 0) | |
758 | return r; | |
759 | } | |
760 | ||
761 | *consoles = con; | |
762 | con = NULL; | |
763 | return 0; | |
764 | } | |
765 | ||
288a74cc RC |
766 | bool tty_is_vc_resolve(const char *tty) { |
767 | _cleanup_free_ char *active = NULL; | |
768 | ||
769 | assert(tty); | |
770 | ||
771 | if (startswith(tty, "/dev/")) | |
772 | tty += 5; | |
773 | ||
774 | if (streq(tty, "console")) { | |
775 | tty = resolve_dev_console(&active); | |
776 | if (!tty) | |
777 | return false; | |
778 | } | |
779 | ||
780 | return tty_is_vc(tty); | |
781 | } | |
782 | ||
783 | const char *default_term_for_tty(const char *tty) { | |
6af760f3 | 784 | return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220"; |
288a74cc RC |
785 | } |
786 | ||
787 | int fd_columns(int fd) { | |
788 | struct winsize ws = {}; | |
789 | ||
790 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
791 | return -errno; | |
792 | ||
793 | if (ws.ws_col <= 0) | |
794 | return -EIO; | |
795 | ||
796 | return ws.ws_col; | |
797 | } | |
798 | ||
799 | unsigned columns(void) { | |
800 | const char *e; | |
801 | int c; | |
802 | ||
803 | if (_likely_(cached_columns > 0)) | |
804 | return cached_columns; | |
805 | ||
806 | c = 0; | |
807 | e = getenv("COLUMNS"); | |
808 | if (e) | |
809 | (void) safe_atoi(e, &c); | |
810 | ||
811 | if (c <= 0) | |
812 | c = fd_columns(STDOUT_FILENO); | |
813 | ||
814 | if (c <= 0) | |
815 | c = 80; | |
816 | ||
817 | cached_columns = c; | |
818 | return cached_columns; | |
819 | } | |
820 | ||
821 | int fd_lines(int fd) { | |
822 | struct winsize ws = {}; | |
823 | ||
824 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
825 | return -errno; | |
826 | ||
827 | if (ws.ws_row <= 0) | |
828 | return -EIO; | |
829 | ||
830 | return ws.ws_row; | |
831 | } | |
832 | ||
833 | unsigned lines(void) { | |
834 | const char *e; | |
835 | int l; | |
836 | ||
837 | if (_likely_(cached_lines > 0)) | |
838 | return cached_lines; | |
839 | ||
840 | l = 0; | |
841 | e = getenv("LINES"); | |
842 | if (e) | |
843 | (void) safe_atoi(e, &l); | |
844 | ||
845 | if (l <= 0) | |
846 | l = fd_lines(STDOUT_FILENO); | |
847 | ||
848 | if (l <= 0) | |
849 | l = 24; | |
850 | ||
851 | cached_lines = l; | |
852 | return cached_lines; | |
853 | } | |
854 | ||
855 | /* intended to be used as a SIGWINCH sighandler */ | |
856 | void columns_lines_cache_reset(int signum) { | |
857 | cached_columns = 0; | |
858 | cached_lines = 0; | |
859 | } | |
860 | ||
861 | bool on_tty(void) { | |
862 | static int cached_on_tty = -1; | |
863 | ||
864 | if (_unlikely_(cached_on_tty < 0)) | |
865 | cached_on_tty = isatty(STDOUT_FILENO) > 0; | |
866 | ||
867 | return cached_on_tty; | |
868 | } | |
869 | ||
870 | int make_stdio(int fd) { | |
871 | int r, s, t; | |
872 | ||
873 | assert(fd >= 0); | |
874 | ||
875 | r = dup2(fd, STDIN_FILENO); | |
876 | s = dup2(fd, STDOUT_FILENO); | |
877 | t = dup2(fd, STDERR_FILENO); | |
878 | ||
879 | if (fd >= 3) | |
880 | safe_close(fd); | |
881 | ||
882 | if (r < 0 || s < 0 || t < 0) | |
883 | return -errno; | |
884 | ||
885 | /* Explicitly unset O_CLOEXEC, since if fd was < 3, then | |
886 | * dup2() was a NOP and the bit hence possibly set. */ | |
913f38e4 | 887 | stdio_unset_cloexec(); |
288a74cc RC |
888 | |
889 | return 0; | |
890 | } | |
891 | ||
892 | int make_null_stdio(void) { | |
893 | int null_fd; | |
894 | ||
895 | null_fd = open("/dev/null", O_RDWR|O_NOCTTY); | |
896 | if (null_fd < 0) | |
897 | return -errno; | |
898 | ||
899 | return make_stdio(null_fd); | |
900 | } | |
901 | ||
902 | int getttyname_malloc(int fd, char **ret) { | |
903 | size_t l = 100; | |
904 | int r; | |
905 | ||
906 | assert(fd >= 0); | |
907 | assert(ret); | |
908 | ||
909 | for (;;) { | |
910 | char path[l]; | |
911 | ||
912 | r = ttyname_r(fd, path, sizeof(path)); | |
913 | if (r == 0) { | |
914 | const char *p; | |
915 | char *c; | |
916 | ||
917 | p = startswith(path, "/dev/"); | |
918 | c = strdup(p ?: path); | |
919 | if (!c) | |
920 | return -ENOMEM; | |
921 | ||
922 | *ret = c; | |
923 | return 0; | |
924 | } | |
925 | ||
926 | if (r != ERANGE) | |
927 | return -r; | |
928 | ||
929 | l *= 2; | |
930 | } | |
931 | ||
932 | return 0; | |
933 | } | |
934 | ||
935 | int getttyname_harder(int fd, char **r) { | |
936 | int k; | |
937 | char *s = NULL; | |
938 | ||
939 | k = getttyname_malloc(fd, &s); | |
940 | if (k < 0) | |
941 | return k; | |
942 | ||
943 | if (streq(s, "tty")) { | |
944 | free(s); | |
945 | return get_ctty(0, NULL, r); | |
946 | } | |
947 | ||
948 | *r = s; | |
949 | return 0; | |
950 | } | |
951 | ||
952 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
953 | int r; | |
954 | _cleanup_free_ char *line = NULL; | |
955 | const char *p; | |
956 | unsigned long ttynr; | |
957 | ||
958 | assert(pid >= 0); | |
959 | ||
960 | p = procfs_file_alloca(pid, "stat"); | |
961 | r = read_one_line_file(p, &line); | |
962 | if (r < 0) | |
963 | return r; | |
964 | ||
965 | p = strrchr(line, ')'); | |
966 | if (!p) | |
967 | return -EIO; | |
968 | ||
969 | p++; | |
970 | ||
971 | if (sscanf(p, " " | |
972 | "%*c " /* state */ | |
973 | "%*d " /* ppid */ | |
974 | "%*d " /* pgrp */ | |
975 | "%*d " /* session */ | |
976 | "%lu ", /* ttynr */ | |
977 | &ttynr) != 1) | |
978 | return -EIO; | |
979 | ||
980 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
cfeaa44a | 981 | return -ENXIO; |
288a74cc RC |
982 | |
983 | if (d) | |
984 | *d = (dev_t) ttynr; | |
985 | ||
986 | return 0; | |
987 | } | |
988 | ||
989 | int get_ctty(pid_t pid, dev_t *_devnr, char **r) { | |
990 | char fn[sizeof("/dev/char/")-1 + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL; | |
991 | _cleanup_free_ char *s = NULL; | |
992 | const char *p; | |
993 | dev_t devnr; | |
994 | int k; | |
995 | ||
996 | assert(r); | |
997 | ||
998 | k = get_ctty_devnr(pid, &devnr); | |
999 | if (k < 0) | |
1000 | return k; | |
1001 | ||
1002 | sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr)); | |
1003 | ||
1004 | k = readlink_malloc(fn, &s); | |
1005 | if (k < 0) { | |
1006 | ||
1007 | if (k != -ENOENT) | |
1008 | return k; | |
1009 | ||
1010 | /* This is an ugly hack */ | |
1011 | if (major(devnr) == 136) { | |
1012 | if (asprintf(&b, "pts/%u", minor(devnr)) < 0) | |
1013 | return -ENOMEM; | |
1014 | } else { | |
1015 | /* Probably something like the ptys which have no | |
1016 | * symlink in /dev/char. Let's return something | |
1017 | * vaguely useful. */ | |
1018 | ||
1019 | b = strdup(fn + 5); | |
1020 | if (!b) | |
1021 | return -ENOMEM; | |
1022 | } | |
1023 | } else { | |
1024 | if (startswith(s, "/dev/")) | |
1025 | p = s + 5; | |
1026 | else if (startswith(s, "../")) | |
1027 | p = s + 3; | |
1028 | else | |
1029 | p = s; | |
1030 | ||
1031 | b = strdup(p); | |
1032 | if (!b) | |
1033 | return -ENOMEM; | |
1034 | } | |
1035 | ||
1036 | *r = b; | |
1037 | if (_devnr) | |
1038 | *_devnr = devnr; | |
1039 | ||
1040 | return 0; | |
1041 | } | |
a07c35c3 | 1042 | |
66cb2fde LP |
1043 | int ptsname_malloc(int fd, char **ret) { |
1044 | size_t l = 100; | |
1045 | ||
1046 | assert(fd >= 0); | |
1047 | assert(ret); | |
1048 | ||
1049 | for (;;) { | |
1050 | char *c; | |
1051 | ||
1052 | c = new(char, l); | |
1053 | if (!c) | |
1054 | return -ENOMEM; | |
1055 | ||
1056 | if (ptsname_r(fd, c, l) == 0) { | |
1057 | *ret = c; | |
1058 | return 0; | |
1059 | } | |
1060 | if (errno != ERANGE) { | |
1061 | free(c); | |
1062 | return -errno; | |
1063 | } | |
1064 | ||
1065 | free(c); | |
1066 | l *= 2; | |
1067 | } | |
1068 | } | |
1069 | ||
a07c35c3 LP |
1070 | int ptsname_namespace(int pty, char **ret) { |
1071 | int no = -1, r; | |
1072 | ||
1073 | /* Like ptsname(), but doesn't assume that the path is | |
1074 | * accessible in the local namespace. */ | |
1075 | ||
1076 | r = ioctl(pty, TIOCGPTN, &no); | |
1077 | if (r < 0) | |
1078 | return -errno; | |
1079 | ||
1080 | if (no < 0) | |
1081 | return -EIO; | |
1082 | ||
1083 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1084 | return -ENOMEM; | |
1085 | ||
1086 | return 0; | |
1087 | } | |
66cb2fde LP |
1088 | |
1089 | int openpt_in_namespace(pid_t pid, int flags) { | |
1090 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1091 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
1092 | siginfo_t si; | |
1093 | pid_t child; | |
1094 | int r; | |
1095 | ||
1096 | assert(pid > 0); | |
1097 | ||
1098 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1099 | if (r < 0) | |
1100 | return r; | |
1101 | ||
1102 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1103 | return -errno; | |
1104 | ||
1105 | child = fork(); | |
1106 | if (child < 0) | |
1107 | return -errno; | |
1108 | ||
1109 | if (child == 0) { | |
1110 | int master; | |
1111 | ||
1112 | pair[0] = safe_close(pair[0]); | |
1113 | ||
1114 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1115 | if (r < 0) | |
1116 | _exit(EXIT_FAILURE); | |
1117 | ||
1118 | master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); | |
1119 | if (master < 0) | |
1120 | _exit(EXIT_FAILURE); | |
1121 | ||
1122 | if (unlockpt(master) < 0) | |
1123 | _exit(EXIT_FAILURE); | |
1124 | ||
1125 | if (send_one_fd(pair[1], master, 0) < 0) | |
1126 | _exit(EXIT_FAILURE); | |
1127 | ||
1128 | _exit(EXIT_SUCCESS); | |
1129 | } | |
1130 | ||
1131 | pair[1] = safe_close(pair[1]); | |
1132 | ||
1133 | r = wait_for_terminate(child, &si); | |
1134 | if (r < 0) | |
1135 | return r; | |
1136 | if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS) | |
1137 | return -EIO; | |
1138 | ||
1139 | return receive_one_fd(pair[0], 0); | |
1140 | } | |
40e1f4ea LP |
1141 | |
1142 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
1143 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1144 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
1145 | siginfo_t si; | |
1146 | pid_t child; | |
1147 | int r; | |
1148 | ||
1149 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1150 | if (r < 0) | |
1151 | return r; | |
1152 | ||
1153 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1154 | return -errno; | |
1155 | ||
1156 | child = fork(); | |
1157 | if (child < 0) | |
1158 | return -errno; | |
1159 | ||
1160 | if (child == 0) { | |
1161 | int master; | |
1162 | ||
1163 | pair[0] = safe_close(pair[0]); | |
1164 | ||
1165 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1166 | if (r < 0) | |
1167 | _exit(EXIT_FAILURE); | |
1168 | ||
1169 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); | |
1170 | if (master < 0) | |
1171 | _exit(EXIT_FAILURE); | |
1172 | ||
1173 | if (send_one_fd(pair[1], master, 0) < 0) | |
1174 | _exit(EXIT_FAILURE); | |
1175 | ||
1176 | _exit(EXIT_SUCCESS); | |
1177 | } | |
1178 | ||
1179 | pair[1] = safe_close(pair[1]); | |
1180 | ||
1181 | r = wait_for_terminate(child, &si); | |
1182 | if (r < 0) | |
1183 | return r; | |
1184 | if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS) | |
1185 | return -EIO; | |
1186 | ||
1187 | return receive_one_fd(pair[0], 0); | |
1188 | } | |
40c9fe4c | 1189 | |
158fbf76 | 1190 | static bool getenv_terminal_is_dumb(void) { |
ac96418b LP |
1191 | const char *e; |
1192 | ||
ac96418b LP |
1193 | e = getenv("TERM"); |
1194 | if (!e) | |
1195 | return true; | |
1196 | ||
1197 | return streq(e, "dumb"); | |
1198 | } | |
1199 | ||
158fbf76 ZJS |
1200 | bool terminal_is_dumb(void) { |
1201 | if (!on_tty()) | |
1202 | return true; | |
1203 | ||
1204 | return getenv_terminal_is_dumb(); | |
1205 | } | |
1206 | ||
40c9fe4c | 1207 | bool colors_enabled(void) { |
ae5b3958 | 1208 | static int enabled = -1; |
40c9fe4c | 1209 | |
ae5b3958 | 1210 | if (_unlikely_(enabled < 0)) { |
acf553b0 | 1211 | int val; |
ae5b3958 | 1212 | |
acf553b0 ZJS |
1213 | val = getenv_bool("SYSTEMD_COLORS"); |
1214 | if (val >= 0) | |
1215 | enabled = val; | |
158fbf76 ZJS |
1216 | else if (getpid() == 1) |
1217 | /* PID1 outputs to the console without holding it open all the time */ | |
1218 | enabled = !getenv_terminal_is_dumb(); | |
ae5b3958 | 1219 | else |
ac96418b | 1220 | enabled = !terminal_is_dumb(); |
40c9fe4c JS |
1221 | } |
1222 | ||
ae5b3958 | 1223 | return enabled; |
40c9fe4c | 1224 | } |