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