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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" |
3ffd4af2 | 42 | #include "fd-util.h" |
288a74cc | 43 | #include "fileio.h" |
f4f15635 | 44 | #include "fs-util.h" |
c004493c | 45 | #include "io-util.h" |
93cc7779 TA |
46 | #include "log.h" |
47 | #include "macro.h" | |
6bedfcbb | 48 | #include "parse-util.h" |
07630cea | 49 | #include "process-util.h" |
2583fbea | 50 | #include "socket-util.h" |
8fcde012 | 51 | #include "stat-util.h" |
07630cea | 52 | #include "string-util.h" |
6af62124 | 53 | #include "strv.h" |
3ffd4af2 | 54 | #include "terminal-util.h" |
07630cea LP |
55 | #include "time-util.h" |
56 | #include "util.h" | |
288a74cc RC |
57 | |
58 | static volatile unsigned cached_columns = 0; | |
59 | static volatile unsigned cached_lines = 0; | |
60 | ||
61 | int chvt(int vt) { | |
62 | _cleanup_close_ int fd; | |
63 | ||
0a8b555c | 64 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
65 | if (fd < 0) |
66 | return -errno; | |
67 | ||
b9e74c39 | 68 | if (vt <= 0) { |
288a74cc RC |
69 | int tiocl[2] = { |
70 | TIOCL_GETKMSGREDIRECT, | |
71 | 0 | |
72 | }; | |
73 | ||
74 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
75 | return -errno; | |
76 | ||
77 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
78 | } | |
79 | ||
80 | if (ioctl(fd, VT_ACTIVATE, vt) < 0) | |
81 | return -errno; | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { | |
87 | struct termios old_termios, new_termios; | |
88 | char c, line[LINE_MAX]; | |
89 | ||
90 | assert(f); | |
91 | assert(ret); | |
92 | ||
93 | if (tcgetattr(fileno(f), &old_termios) >= 0) { | |
94 | new_termios = old_termios; | |
95 | ||
96 | new_termios.c_lflag &= ~ICANON; | |
97 | new_termios.c_cc[VMIN] = 1; | |
98 | new_termios.c_cc[VTIME] = 0; | |
99 | ||
100 | if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) { | |
101 | size_t k; | |
102 | ||
103 | if (t != USEC_INFINITY) { | |
104 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) { | |
105 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
106 | return -ETIMEDOUT; | |
107 | } | |
108 | } | |
109 | ||
110 | k = fread(&c, 1, 1, f); | |
111 | ||
112 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
113 | ||
114 | if (k <= 0) | |
115 | return -EIO; | |
116 | ||
117 | if (need_nl) | |
118 | *need_nl = c != '\n'; | |
119 | ||
120 | *ret = c; | |
121 | return 0; | |
122 | } | |
123 | } | |
124 | ||
125 | if (t != USEC_INFINITY) { | |
126 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) | |
127 | return -ETIMEDOUT; | |
128 | } | |
129 | ||
130 | errno = 0; | |
131 | if (!fgets(line, sizeof(line), f)) | |
f5e5c28f | 132 | return errno > 0 ? -errno : -EIO; |
288a74cc RC |
133 | |
134 | truncate_nl(line); | |
135 | ||
136 | if (strlen(line) != 1) | |
137 | return -EBADMSG; | |
138 | ||
139 | if (need_nl) | |
140 | *need_nl = false; | |
141 | ||
142 | *ret = line[0]; | |
143 | return 0; | |
144 | } | |
145 | ||
146 | int ask_char(char *ret, const char *replies, const char *text, ...) { | |
147 | int r; | |
148 | ||
149 | assert(ret); | |
150 | assert(replies); | |
151 | assert(text); | |
152 | ||
153 | for (;;) { | |
154 | va_list ap; | |
155 | char c; | |
156 | bool need_nl = true; | |
157 | ||
7565bb98 | 158 | if (colors_enabled()) |
1fc464f6 | 159 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc RC |
160 | |
161 | va_start(ap, text); | |
162 | vprintf(text, ap); | |
163 | va_end(ap); | |
164 | ||
7565bb98 | 165 | if (colors_enabled()) |
1fc464f6 | 166 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
167 | |
168 | fflush(stdout); | |
169 | ||
170 | r = read_one_char(stdin, &c, USEC_INFINITY, &need_nl); | |
171 | if (r < 0) { | |
172 | ||
173 | if (r == -EBADMSG) { | |
174 | puts("Bad input, please try again."); | |
175 | continue; | |
176 | } | |
177 | ||
178 | putchar('\n'); | |
179 | return r; | |
180 | } | |
181 | ||
182 | if (need_nl) | |
183 | putchar('\n'); | |
184 | ||
185 | if (strchr(replies, c)) { | |
186 | *ret = c; | |
187 | return 0; | |
188 | } | |
189 | ||
190 | puts("Read unexpected character, please try again."); | |
191 | } | |
192 | } | |
193 | ||
194 | int ask_string(char **ret, const char *text, ...) { | |
195 | assert(ret); | |
196 | assert(text); | |
197 | ||
198 | for (;;) { | |
199 | char line[LINE_MAX]; | |
200 | va_list ap; | |
201 | ||
7565bb98 | 202 | if (colors_enabled()) |
1fc464f6 | 203 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc RC |
204 | |
205 | va_start(ap, text); | |
206 | vprintf(text, ap); | |
207 | va_end(ap); | |
208 | ||
7565bb98 | 209 | if (colors_enabled()) |
1fc464f6 | 210 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
211 | |
212 | fflush(stdout); | |
213 | ||
214 | errno = 0; | |
215 | if (!fgets(line, sizeof(line), stdin)) | |
f5e5c28f | 216 | return errno > 0 ? -errno : -EIO; |
288a74cc RC |
217 | |
218 | if (!endswith(line, "\n")) | |
219 | putchar('\n'); | |
220 | else { | |
221 | char *s; | |
222 | ||
223 | if (isempty(line)) | |
224 | continue; | |
225 | ||
226 | truncate_nl(line); | |
227 | s = strdup(line); | |
228 | if (!s) | |
229 | return -ENOMEM; | |
230 | ||
231 | *ret = s; | |
232 | return 0; | |
233 | } | |
234 | } | |
235 | } | |
236 | ||
237 | int reset_terminal_fd(int fd, bool switch_to_text) { | |
238 | struct termios termios; | |
239 | int r = 0; | |
240 | ||
241 | /* Set terminal to some sane defaults */ | |
242 | ||
243 | assert(fd >= 0); | |
244 | ||
245 | /* We leave locked terminal attributes untouched, so that | |
246 | * Plymouth may set whatever it wants to set, and we don't | |
247 | * interfere with that. */ | |
248 | ||
249 | /* Disable exclusive mode, just in case */ | |
7d927c9a | 250 | (void) ioctl(fd, TIOCNXCL); |
288a74cc RC |
251 | |
252 | /* Switch to text mode */ | |
253 | if (switch_to_text) | |
7d927c9a | 254 | (void) ioctl(fd, KDSETMODE, KD_TEXT); |
288a74cc RC |
255 | |
256 | /* Enable console unicode mode */ | |
7d927c9a | 257 | (void) ioctl(fd, KDSKBMODE, K_UNICODE); |
288a74cc RC |
258 | |
259 | if (tcgetattr(fd, &termios) < 0) { | |
260 | r = -errno; | |
261 | goto finish; | |
262 | } | |
263 | ||
264 | /* We only reset the stuff that matters to the software. How | |
265 | * hardware is set up we don't touch assuming that somebody | |
266 | * else will do that for us */ | |
267 | ||
268 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
269 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
270 | termios.c_oflag |= ONLCR; | |
271 | termios.c_cflag |= CREAD; | |
272 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
273 | ||
274 | termios.c_cc[VINTR] = 03; /* ^C */ | |
275 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
276 | termios.c_cc[VERASE] = 0177; | |
277 | termios.c_cc[VKILL] = 025; /* ^X */ | |
278 | termios.c_cc[VEOF] = 04; /* ^D */ | |
279 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
280 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
281 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
282 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
283 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
284 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
285 | termios.c_cc[VEOL] = 0; | |
286 | termios.c_cc[VEOL2] = 0; | |
287 | ||
288 | termios.c_cc[VTIME] = 0; | |
289 | termios.c_cc[VMIN] = 1; | |
290 | ||
291 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
292 | r = -errno; | |
293 | ||
294 | finish: | |
295 | /* Just in case, flush all crap out */ | |
7d927c9a | 296 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
297 | |
298 | return r; | |
299 | } | |
300 | ||
301 | int reset_terminal(const char *name) { | |
302 | _cleanup_close_ int fd = -1; | |
303 | ||
0a8b555c LP |
304 | /* We open the terminal with O_NONBLOCK here, to ensure we |
305 | * don't block on carrier if this is a terminal with carrier | |
306 | * configured. */ | |
307 | ||
308 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
309 | if (fd < 0) |
310 | return fd; | |
311 | ||
312 | return reset_terminal_fd(fd, true); | |
313 | } | |
314 | ||
315 | int open_terminal(const char *name, int mode) { | |
316 | int fd, r; | |
317 | unsigned c = 0; | |
318 | ||
319 | /* | |
320 | * If a TTY is in the process of being closed opening it might | |
321 | * cause EIO. This is horribly awful, but unlikely to be | |
322 | * changed in the kernel. Hence we work around this problem by | |
323 | * retrying a couple of times. | |
324 | * | |
325 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
326 | */ | |
327 | ||
35bdab77 LP |
328 | if (mode & O_CREAT) |
329 | return -EINVAL; | |
288a74cc RC |
330 | |
331 | for (;;) { | |
332 | fd = open(name, mode, 0); | |
333 | if (fd >= 0) | |
334 | break; | |
335 | ||
336 | if (errno != EIO) | |
337 | return -errno; | |
338 | ||
339 | /* Max 1s in total */ | |
340 | if (c >= 20) | |
341 | return -errno; | |
342 | ||
343 | usleep(50 * USEC_PER_MSEC); | |
344 | c++; | |
345 | } | |
346 | ||
347 | r = isatty(fd); | |
348 | if (r < 0) { | |
349 | safe_close(fd); | |
350 | return -errno; | |
351 | } | |
352 | ||
353 | if (!r) { | |
354 | safe_close(fd); | |
355 | return -ENOTTY; | |
356 | } | |
357 | ||
358 | return fd; | |
359 | } | |
360 | ||
361 | int acquire_terminal( | |
362 | const char *name, | |
363 | bool fail, | |
364 | bool force, | |
365 | bool ignore_tiocstty_eperm, | |
366 | usec_t timeout) { | |
367 | ||
368 | int fd = -1, notify = -1, r = 0, wd = -1; | |
369 | usec_t ts = 0; | |
370 | ||
371 | assert(name); | |
372 | ||
373 | /* We use inotify to be notified when the tty is closed. We | |
374 | * create the watch before checking if we can actually acquire | |
375 | * it, so that we don't lose any event. | |
376 | * | |
377 | * Note: strictly speaking this actually watches for the | |
378 | * device being closed, it does *not* really watch whether a | |
379 | * tty loses its controlling process. However, unless some | |
380 | * rogue process uses TIOCNOTTY on /dev/tty *after* closing | |
381 | * its tty otherwise this will not become a problem. As long | |
382 | * as the administrator makes sure not configure any service | |
383 | * on the same tty as an untrusted user this should not be a | |
384 | * problem. (Which he probably should not do anyway.) */ | |
385 | ||
386 | if (timeout != USEC_INFINITY) | |
387 | ts = now(CLOCK_MONOTONIC); | |
388 | ||
389 | if (!fail && !force) { | |
390 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); | |
391 | if (notify < 0) { | |
392 | r = -errno; | |
393 | goto fail; | |
394 | } | |
395 | ||
396 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
397 | if (wd < 0) { | |
398 | r = -errno; | |
399 | goto fail; | |
400 | } | |
401 | } | |
402 | ||
403 | for (;;) { | |
404 | struct sigaction sa_old, sa_new = { | |
405 | .sa_handler = SIG_IGN, | |
406 | .sa_flags = SA_RESTART, | |
407 | }; | |
408 | ||
409 | if (notify >= 0) { | |
410 | r = flush_fd(notify); | |
411 | if (r < 0) | |
412 | goto fail; | |
413 | } | |
414 | ||
415 | /* We pass here O_NOCTTY only so that we can check the return | |
416 | * value TIOCSCTTY and have a reliable way to figure out if we | |
417 | * successfully became the controlling process of the tty */ | |
418 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
419 | if (fd < 0) | |
420 | return fd; | |
421 | ||
422 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
423 | * if we already own the tty. */ | |
424 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
425 | ||
426 | /* First, try to get the tty */ | |
427 | if (ioctl(fd, TIOCSCTTY, force) < 0) | |
428 | r = -errno; | |
429 | ||
430 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
431 | ||
b938cb90 | 432 | /* Sometimes, it makes sense to ignore TIOCSCTTY |
288a74cc RC |
433 | * returning EPERM, i.e. when very likely we already |
434 | * are have this controlling terminal. */ | |
435 | if (r < 0 && r == -EPERM && ignore_tiocstty_eperm) | |
436 | r = 0; | |
437 | ||
7d927c9a | 438 | if (r < 0 && (force || fail || r != -EPERM)) |
288a74cc | 439 | goto fail; |
288a74cc RC |
440 | |
441 | if (r >= 0) | |
442 | break; | |
443 | ||
444 | assert(!fail); | |
445 | assert(!force); | |
446 | assert(notify >= 0); | |
447 | ||
448 | for (;;) { | |
449 | union inotify_event_buffer buffer; | |
450 | struct inotify_event *e; | |
451 | ssize_t l; | |
452 | ||
453 | if (timeout != USEC_INFINITY) { | |
454 | usec_t n; | |
455 | ||
456 | n = now(CLOCK_MONOTONIC); | |
457 | if (ts + timeout < n) { | |
458 | r = -ETIMEDOUT; | |
459 | goto fail; | |
460 | } | |
461 | ||
462 | r = fd_wait_for_event(fd, POLLIN, ts + timeout - n); | |
463 | if (r < 0) | |
464 | goto fail; | |
465 | ||
466 | if (r == 0) { | |
467 | r = -ETIMEDOUT; | |
468 | goto fail; | |
469 | } | |
470 | } | |
471 | ||
472 | l = read(notify, &buffer, sizeof(buffer)); | |
473 | if (l < 0) { | |
474 | if (errno == EINTR || errno == EAGAIN) | |
475 | continue; | |
476 | ||
477 | r = -errno; | |
478 | goto fail; | |
479 | } | |
480 | ||
481 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
482 | if (e->wd != wd || !(e->mask & IN_CLOSE)) { | |
483 | r = -EIO; | |
484 | goto fail; | |
485 | } | |
486 | } | |
487 | ||
488 | break; | |
489 | } | |
490 | ||
491 | /* We close the tty fd here since if the old session | |
492 | * ended our handle will be dead. It's important that | |
493 | * we do this after sleeping, so that we don't enter | |
494 | * an endless loop. */ | |
495 | fd = safe_close(fd); | |
496 | } | |
497 | ||
498 | safe_close(notify); | |
499 | ||
288a74cc RC |
500 | return fd; |
501 | ||
502 | fail: | |
503 | safe_close(fd); | |
504 | safe_close(notify); | |
505 | ||
506 | return r; | |
507 | } | |
508 | ||
509 | int release_terminal(void) { | |
510 | static const struct sigaction sa_new = { | |
511 | .sa_handler = SIG_IGN, | |
512 | .sa_flags = SA_RESTART, | |
513 | }; | |
514 | ||
515 | _cleanup_close_ int fd = -1; | |
516 | struct sigaction sa_old; | |
517 | int r = 0; | |
518 | ||
0a8b555c | 519 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
520 | if (fd < 0) |
521 | return -errno; | |
522 | ||
523 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
524 | * by our own TIOCNOTTY */ | |
525 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
526 | ||
527 | if (ioctl(fd, TIOCNOTTY) < 0) | |
528 | r = -errno; | |
529 | ||
530 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
531 | ||
532 | return r; | |
533 | } | |
534 | ||
535 | int terminal_vhangup_fd(int fd) { | |
536 | assert(fd >= 0); | |
537 | ||
538 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
539 | return -errno; | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
544 | int terminal_vhangup(const char *name) { | |
545 | _cleanup_close_ int fd; | |
546 | ||
0a8b555c | 547 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
548 | if (fd < 0) |
549 | return fd; | |
550 | ||
551 | return terminal_vhangup_fd(fd); | |
552 | } | |
553 | ||
554 | int vt_disallocate(const char *name) { | |
1ba23931 | 555 | _cleanup_close_ int fd = -1; |
288a74cc | 556 | unsigned u; |
1ba23931 | 557 | int r; |
288a74cc RC |
558 | |
559 | /* Deallocate the VT if possible. If not possible | |
560 | * (i.e. because it is the active one), at least clear it | |
561 | * entirely (including the scrollback buffer) */ | |
562 | ||
563 | if (!startswith(name, "/dev/")) | |
564 | return -EINVAL; | |
565 | ||
566 | if (!tty_is_vc(name)) { | |
567 | /* So this is not a VT. I guess we cannot deallocate | |
568 | * it then. But let's at least clear the screen */ | |
569 | ||
570 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
571 | if (fd < 0) | |
572 | return fd; | |
573 | ||
574 | loop_write(fd, | |
575 | "\033[r" /* clear scrolling region */ | |
576 | "\033[H" /* move home */ | |
577 | "\033[2J", /* clear screen */ | |
578 | 10, false); | |
288a74cc RC |
579 | return 0; |
580 | } | |
581 | ||
582 | if (!startswith(name, "/dev/tty")) | |
583 | return -EINVAL; | |
584 | ||
585 | r = safe_atou(name+8, &u); | |
586 | if (r < 0) | |
587 | return r; | |
588 | ||
589 | if (u <= 0) | |
590 | return -EINVAL; | |
591 | ||
592 | /* Try to deallocate */ | |
0a8b555c | 593 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
594 | if (fd < 0) |
595 | return fd; | |
596 | ||
597 | r = ioctl(fd, VT_DISALLOCATE, u); | |
1ba23931 | 598 | fd = safe_close(fd); |
288a74cc RC |
599 | |
600 | if (r >= 0) | |
601 | return 0; | |
602 | ||
603 | if (errno != EBUSY) | |
604 | return -errno; | |
605 | ||
606 | /* Couldn't deallocate, so let's clear it fully with | |
607 | * scrollback */ | |
608 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
609 | if (fd < 0) | |
610 | return fd; | |
611 | ||
612 | loop_write(fd, | |
613 | "\033[r" /* clear scrolling region */ | |
614 | "\033[H" /* move home */ | |
615 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
616 | 10, false); | |
288a74cc RC |
617 | return 0; |
618 | } | |
619 | ||
288a74cc RC |
620 | int make_console_stdio(void) { |
621 | int fd, r; | |
622 | ||
623 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr */ | |
624 | ||
625 | fd = acquire_terminal("/dev/console", false, true, true, USEC_INFINITY); | |
626 | if (fd < 0) | |
627 | return log_error_errno(fd, "Failed to acquire terminal: %m"); | |
628 | ||
3d18b167 LP |
629 | r = reset_terminal_fd(fd, true); |
630 | if (r < 0) | |
631 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
632 | ||
288a74cc RC |
633 | r = make_stdio(fd); |
634 | if (r < 0) | |
635 | return log_error_errno(r, "Failed to duplicate terminal fd: %m"); | |
636 | ||
637 | return 0; | |
638 | } | |
639 | ||
288a74cc RC |
640 | bool tty_is_vc(const char *tty) { |
641 | assert(tty); | |
642 | ||
643 | return vtnr_from_tty(tty) >= 0; | |
644 | } | |
645 | ||
646 | bool tty_is_console(const char *tty) { | |
647 | assert(tty); | |
648 | ||
649 | if (startswith(tty, "/dev/")) | |
650 | tty += 5; | |
651 | ||
652 | return streq(tty, "console"); | |
653 | } | |
654 | ||
655 | int vtnr_from_tty(const char *tty) { | |
656 | int i, r; | |
657 | ||
658 | assert(tty); | |
659 | ||
660 | if (startswith(tty, "/dev/")) | |
661 | tty += 5; | |
662 | ||
663 | if (!startswith(tty, "tty") ) | |
664 | return -EINVAL; | |
665 | ||
666 | if (tty[3] < '0' || tty[3] > '9') | |
667 | return -EINVAL; | |
668 | ||
669 | r = safe_atoi(tty+3, &i); | |
670 | if (r < 0) | |
671 | return r; | |
672 | ||
673 | if (i < 0 || i > 63) | |
674 | return -EINVAL; | |
675 | ||
676 | return i; | |
677 | } | |
678 | ||
679 | char *resolve_dev_console(char **active) { | |
680 | char *tty; | |
681 | ||
682 | /* Resolve where /dev/console is pointing to, if /sys is actually ours | |
683 | * (i.e. not read-only-mounted which is a sign for container setups) */ | |
684 | ||
685 | if (path_is_read_only_fs("/sys") > 0) | |
686 | return NULL; | |
687 | ||
688 | if (read_one_line_file("/sys/class/tty/console/active", active) < 0) | |
689 | return NULL; | |
690 | ||
691 | /* If multiple log outputs are configured the last one is what | |
692 | * /dev/console points to */ | |
693 | tty = strrchr(*active, ' '); | |
694 | if (tty) | |
695 | tty++; | |
696 | else | |
697 | tty = *active; | |
698 | ||
699 | if (streq(tty, "tty0")) { | |
700 | char *tmp; | |
701 | ||
702 | /* Get the active VC (e.g. tty1) */ | |
703 | if (read_one_line_file("/sys/class/tty/tty0/active", &tmp) >= 0) { | |
704 | free(*active); | |
705 | tty = *active = tmp; | |
706 | } | |
707 | } | |
708 | ||
709 | return tty; | |
710 | } | |
711 | ||
6af62124 WF |
712 | int get_kernel_consoles(char ***consoles) { |
713 | _cleanup_strv_free_ char **con = NULL; | |
714 | _cleanup_free_ char *line = NULL; | |
715 | const char *active; | |
716 | int r; | |
717 | ||
718 | assert(consoles); | |
719 | ||
720 | r = read_one_line_file("/sys/class/tty/console/active", &line); | |
721 | if (r < 0) | |
722 | return r; | |
723 | ||
724 | active = line; | |
725 | for (;;) { | |
726 | _cleanup_free_ char *tty = NULL; | |
727 | char *path; | |
728 | ||
729 | r = extract_first_word(&active, &tty, NULL, 0); | |
730 | if (r < 0) | |
731 | return r; | |
732 | if (r == 0) | |
733 | break; | |
734 | ||
735 | if (streq(tty, "tty0")) { | |
736 | tty = mfree(tty); | |
737 | r = read_one_line_file("/sys/class/tty/tty0/active", &tty); | |
738 | if (r < 0) | |
739 | return r; | |
740 | } | |
741 | ||
742 | path = strappend("/dev/", tty); | |
743 | if (!path) | |
744 | return -ENOMEM; | |
745 | ||
746 | if (access(path, F_OK) < 0) { | |
747 | log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path); | |
748 | free(path); | |
749 | continue; | |
750 | } | |
751 | ||
752 | r = strv_consume(&con, path); | |
753 | if (r < 0) | |
754 | return r; | |
755 | } | |
756 | ||
757 | if (strv_isempty(con)) { | |
758 | log_debug("No devices found for system console"); | |
759 | ||
760 | r = strv_extend(&con, "/dev/console"); | |
761 | if (r < 0) | |
762 | return r; | |
763 | } | |
764 | ||
765 | *consoles = con; | |
766 | con = NULL; | |
767 | return 0; | |
768 | } | |
769 | ||
288a74cc RC |
770 | bool tty_is_vc_resolve(const char *tty) { |
771 | _cleanup_free_ char *active = NULL; | |
772 | ||
773 | assert(tty); | |
774 | ||
775 | if (startswith(tty, "/dev/")) | |
776 | tty += 5; | |
777 | ||
778 | if (streq(tty, "console")) { | |
779 | tty = resolve_dev_console(&active); | |
780 | if (!tty) | |
781 | return false; | |
782 | } | |
783 | ||
784 | return tty_is_vc(tty); | |
785 | } | |
786 | ||
787 | const char *default_term_for_tty(const char *tty) { | |
1e22b5cd | 788 | return tty && tty_is_vc_resolve(tty) ? "TERM=linux" : "TERM=vt220"; |
288a74cc RC |
789 | } |
790 | ||
791 | int fd_columns(int fd) { | |
792 | struct winsize ws = {}; | |
793 | ||
794 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
795 | return -errno; | |
796 | ||
797 | if (ws.ws_col <= 0) | |
798 | return -EIO; | |
799 | ||
800 | return ws.ws_col; | |
801 | } | |
802 | ||
803 | unsigned columns(void) { | |
804 | const char *e; | |
805 | int c; | |
806 | ||
807 | if (_likely_(cached_columns > 0)) | |
808 | return cached_columns; | |
809 | ||
810 | c = 0; | |
811 | e = getenv("COLUMNS"); | |
812 | if (e) | |
813 | (void) safe_atoi(e, &c); | |
814 | ||
815 | if (c <= 0) | |
816 | c = fd_columns(STDOUT_FILENO); | |
817 | ||
818 | if (c <= 0) | |
819 | c = 80; | |
820 | ||
821 | cached_columns = c; | |
822 | return cached_columns; | |
823 | } | |
824 | ||
825 | int fd_lines(int fd) { | |
826 | struct winsize ws = {}; | |
827 | ||
828 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
829 | return -errno; | |
830 | ||
831 | if (ws.ws_row <= 0) | |
832 | return -EIO; | |
833 | ||
834 | return ws.ws_row; | |
835 | } | |
836 | ||
837 | unsigned lines(void) { | |
838 | const char *e; | |
839 | int l; | |
840 | ||
841 | if (_likely_(cached_lines > 0)) | |
842 | return cached_lines; | |
843 | ||
844 | l = 0; | |
845 | e = getenv("LINES"); | |
846 | if (e) | |
847 | (void) safe_atoi(e, &l); | |
848 | ||
849 | if (l <= 0) | |
850 | l = fd_lines(STDOUT_FILENO); | |
851 | ||
852 | if (l <= 0) | |
853 | l = 24; | |
854 | ||
855 | cached_lines = l; | |
856 | return cached_lines; | |
857 | } | |
858 | ||
859 | /* intended to be used as a SIGWINCH sighandler */ | |
860 | void columns_lines_cache_reset(int signum) { | |
861 | cached_columns = 0; | |
862 | cached_lines = 0; | |
863 | } | |
864 | ||
865 | bool on_tty(void) { | |
866 | static int cached_on_tty = -1; | |
867 | ||
868 | if (_unlikely_(cached_on_tty < 0)) | |
869 | cached_on_tty = isatty(STDOUT_FILENO) > 0; | |
870 | ||
871 | return cached_on_tty; | |
872 | } | |
873 | ||
874 | int make_stdio(int fd) { | |
875 | int r, s, t; | |
876 | ||
877 | assert(fd >= 0); | |
878 | ||
879 | r = dup2(fd, STDIN_FILENO); | |
880 | s = dup2(fd, STDOUT_FILENO); | |
881 | t = dup2(fd, STDERR_FILENO); | |
882 | ||
883 | if (fd >= 3) | |
884 | safe_close(fd); | |
885 | ||
886 | if (r < 0 || s < 0 || t < 0) | |
887 | return -errno; | |
888 | ||
889 | /* Explicitly unset O_CLOEXEC, since if fd was < 3, then | |
890 | * dup2() was a NOP and the bit hence possibly set. */ | |
913f38e4 | 891 | stdio_unset_cloexec(); |
288a74cc RC |
892 | |
893 | return 0; | |
894 | } | |
895 | ||
896 | int make_null_stdio(void) { | |
897 | int null_fd; | |
898 | ||
899 | null_fd = open("/dev/null", O_RDWR|O_NOCTTY); | |
900 | if (null_fd < 0) | |
901 | return -errno; | |
902 | ||
903 | return make_stdio(null_fd); | |
904 | } | |
905 | ||
906 | int getttyname_malloc(int fd, char **ret) { | |
907 | size_t l = 100; | |
908 | int r; | |
909 | ||
910 | assert(fd >= 0); | |
911 | assert(ret); | |
912 | ||
913 | for (;;) { | |
914 | char path[l]; | |
915 | ||
916 | r = ttyname_r(fd, path, sizeof(path)); | |
917 | if (r == 0) { | |
918 | const char *p; | |
919 | char *c; | |
920 | ||
921 | p = startswith(path, "/dev/"); | |
922 | c = strdup(p ?: path); | |
923 | if (!c) | |
924 | return -ENOMEM; | |
925 | ||
926 | *ret = c; | |
927 | return 0; | |
928 | } | |
929 | ||
930 | if (r != ERANGE) | |
931 | return -r; | |
932 | ||
933 | l *= 2; | |
934 | } | |
935 | ||
936 | return 0; | |
937 | } | |
938 | ||
939 | int getttyname_harder(int fd, char **r) { | |
940 | int k; | |
941 | char *s = NULL; | |
942 | ||
943 | k = getttyname_malloc(fd, &s); | |
944 | if (k < 0) | |
945 | return k; | |
946 | ||
947 | if (streq(s, "tty")) { | |
948 | free(s); | |
949 | return get_ctty(0, NULL, r); | |
950 | } | |
951 | ||
952 | *r = s; | |
953 | return 0; | |
954 | } | |
955 | ||
956 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
957 | int r; | |
958 | _cleanup_free_ char *line = NULL; | |
959 | const char *p; | |
960 | unsigned long ttynr; | |
961 | ||
962 | assert(pid >= 0); | |
963 | ||
964 | p = procfs_file_alloca(pid, "stat"); | |
965 | r = read_one_line_file(p, &line); | |
966 | if (r < 0) | |
967 | return r; | |
968 | ||
969 | p = strrchr(line, ')'); | |
970 | if (!p) | |
971 | return -EIO; | |
972 | ||
973 | p++; | |
974 | ||
975 | if (sscanf(p, " " | |
976 | "%*c " /* state */ | |
977 | "%*d " /* ppid */ | |
978 | "%*d " /* pgrp */ | |
979 | "%*d " /* session */ | |
980 | "%lu ", /* ttynr */ | |
981 | &ttynr) != 1) | |
982 | return -EIO; | |
983 | ||
984 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
cfeaa44a | 985 | return -ENXIO; |
288a74cc RC |
986 | |
987 | if (d) | |
988 | *d = (dev_t) ttynr; | |
989 | ||
990 | return 0; | |
991 | } | |
992 | ||
993 | int get_ctty(pid_t pid, dev_t *_devnr, char **r) { | |
994 | char fn[sizeof("/dev/char/")-1 + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL; | |
995 | _cleanup_free_ char *s = NULL; | |
996 | const char *p; | |
997 | dev_t devnr; | |
998 | int k; | |
999 | ||
1000 | assert(r); | |
1001 | ||
1002 | k = get_ctty_devnr(pid, &devnr); | |
1003 | if (k < 0) | |
1004 | return k; | |
1005 | ||
1006 | sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr)); | |
1007 | ||
1008 | k = readlink_malloc(fn, &s); | |
1009 | if (k < 0) { | |
1010 | ||
1011 | if (k != -ENOENT) | |
1012 | return k; | |
1013 | ||
1014 | /* This is an ugly hack */ | |
1015 | if (major(devnr) == 136) { | |
1016 | if (asprintf(&b, "pts/%u", minor(devnr)) < 0) | |
1017 | return -ENOMEM; | |
1018 | } else { | |
1019 | /* Probably something like the ptys which have no | |
1020 | * symlink in /dev/char. Let's return something | |
1021 | * vaguely useful. */ | |
1022 | ||
1023 | b = strdup(fn + 5); | |
1024 | if (!b) | |
1025 | return -ENOMEM; | |
1026 | } | |
1027 | } else { | |
1028 | if (startswith(s, "/dev/")) | |
1029 | p = s + 5; | |
1030 | else if (startswith(s, "../")) | |
1031 | p = s + 3; | |
1032 | else | |
1033 | p = s; | |
1034 | ||
1035 | b = strdup(p); | |
1036 | if (!b) | |
1037 | return -ENOMEM; | |
1038 | } | |
1039 | ||
1040 | *r = b; | |
1041 | if (_devnr) | |
1042 | *_devnr = devnr; | |
1043 | ||
1044 | return 0; | |
1045 | } | |
a07c35c3 | 1046 | |
66cb2fde LP |
1047 | int ptsname_malloc(int fd, char **ret) { |
1048 | size_t l = 100; | |
1049 | ||
1050 | assert(fd >= 0); | |
1051 | assert(ret); | |
1052 | ||
1053 | for (;;) { | |
1054 | char *c; | |
1055 | ||
1056 | c = new(char, l); | |
1057 | if (!c) | |
1058 | return -ENOMEM; | |
1059 | ||
1060 | if (ptsname_r(fd, c, l) == 0) { | |
1061 | *ret = c; | |
1062 | return 0; | |
1063 | } | |
1064 | if (errno != ERANGE) { | |
1065 | free(c); | |
1066 | return -errno; | |
1067 | } | |
1068 | ||
1069 | free(c); | |
1070 | l *= 2; | |
1071 | } | |
1072 | } | |
1073 | ||
a07c35c3 LP |
1074 | int ptsname_namespace(int pty, char **ret) { |
1075 | int no = -1, r; | |
1076 | ||
1077 | /* Like ptsname(), but doesn't assume that the path is | |
1078 | * accessible in the local namespace. */ | |
1079 | ||
1080 | r = ioctl(pty, TIOCGPTN, &no); | |
1081 | if (r < 0) | |
1082 | return -errno; | |
1083 | ||
1084 | if (no < 0) | |
1085 | return -EIO; | |
1086 | ||
1087 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1088 | return -ENOMEM; | |
1089 | ||
1090 | return 0; | |
1091 | } | |
66cb2fde LP |
1092 | |
1093 | int openpt_in_namespace(pid_t pid, int flags) { | |
1094 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1095 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
1096 | siginfo_t si; | |
1097 | pid_t child; | |
1098 | int r; | |
1099 | ||
1100 | assert(pid > 0); | |
1101 | ||
1102 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1103 | if (r < 0) | |
1104 | return r; | |
1105 | ||
1106 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1107 | return -errno; | |
1108 | ||
1109 | child = fork(); | |
1110 | if (child < 0) | |
1111 | return -errno; | |
1112 | ||
1113 | if (child == 0) { | |
1114 | int master; | |
1115 | ||
1116 | pair[0] = safe_close(pair[0]); | |
1117 | ||
1118 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1119 | if (r < 0) | |
1120 | _exit(EXIT_FAILURE); | |
1121 | ||
1122 | master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); | |
1123 | if (master < 0) | |
1124 | _exit(EXIT_FAILURE); | |
1125 | ||
1126 | if (unlockpt(master) < 0) | |
1127 | _exit(EXIT_FAILURE); | |
1128 | ||
1129 | if (send_one_fd(pair[1], master, 0) < 0) | |
1130 | _exit(EXIT_FAILURE); | |
1131 | ||
1132 | _exit(EXIT_SUCCESS); | |
1133 | } | |
1134 | ||
1135 | pair[1] = safe_close(pair[1]); | |
1136 | ||
1137 | r = wait_for_terminate(child, &si); | |
1138 | if (r < 0) | |
1139 | return r; | |
1140 | if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS) | |
1141 | return -EIO; | |
1142 | ||
1143 | return receive_one_fd(pair[0], 0); | |
1144 | } | |
40e1f4ea LP |
1145 | |
1146 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
1147 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1148 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
1149 | siginfo_t si; | |
1150 | pid_t child; | |
1151 | int r; | |
1152 | ||
1153 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1154 | if (r < 0) | |
1155 | return r; | |
1156 | ||
1157 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1158 | return -errno; | |
1159 | ||
1160 | child = fork(); | |
1161 | if (child < 0) | |
1162 | return -errno; | |
1163 | ||
1164 | if (child == 0) { | |
1165 | int master; | |
1166 | ||
1167 | pair[0] = safe_close(pair[0]); | |
1168 | ||
1169 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1170 | if (r < 0) | |
1171 | _exit(EXIT_FAILURE); | |
1172 | ||
1173 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); | |
1174 | if (master < 0) | |
1175 | _exit(EXIT_FAILURE); | |
1176 | ||
1177 | if (send_one_fd(pair[1], master, 0) < 0) | |
1178 | _exit(EXIT_FAILURE); | |
1179 | ||
1180 | _exit(EXIT_SUCCESS); | |
1181 | } | |
1182 | ||
1183 | pair[1] = safe_close(pair[1]); | |
1184 | ||
1185 | r = wait_for_terminate(child, &si); | |
1186 | if (r < 0) | |
1187 | return r; | |
1188 | if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS) | |
1189 | return -EIO; | |
1190 | ||
1191 | return receive_one_fd(pair[0], 0); | |
1192 | } | |
40c9fe4c | 1193 | |
ac96418b LP |
1194 | bool terminal_is_dumb(void) { |
1195 | const char *e; | |
1196 | ||
1197 | if (!on_tty()) | |
1198 | return true; | |
1199 | ||
1200 | e = getenv("TERM"); | |
1201 | if (!e) | |
1202 | return true; | |
1203 | ||
1204 | return streq(e, "dumb"); | |
1205 | } | |
1206 | ||
40c9fe4c | 1207 | bool colors_enabled(void) { |
ae5b3958 | 1208 | static int enabled = -1; |
40c9fe4c | 1209 | |
ae5b3958 ZJS |
1210 | if (_unlikely_(enabled < 0)) { |
1211 | const char *colors; | |
1212 | ||
1213 | colors = getenv("SYSTEMD_COLORS"); | |
1214 | if (colors) | |
1215 | enabled = parse_boolean(colors) != 0; | |
ae5b3958 | 1216 | else |
ac96418b | 1217 | enabled = !terminal_is_dumb(); |
40c9fe4c JS |
1218 | } |
1219 | ||
ae5b3958 | 1220 | return enabled; |
40c9fe4c | 1221 | } |