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Commit | Line | Data |
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52ad194e | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
e3bff60a MP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
4c89c718 | 21 | #include <errno.h> |
db2df898 | 22 | #include <fcntl.h> |
4c89c718 MP |
23 | #include <limits.h> |
24 | #include <stdarg.h> | |
25 | #include <stddef.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <sys/inotify.h> | |
29 | #include <sys/socket.h> | |
30 | #include <sys/sysmacros.h> | |
31 | #include <sys/time.h> | |
db2df898 MP |
32 | #include <linux/kd.h> |
33 | #include <linux/tiocl.h> | |
34 | #include <linux/vt.h> | |
35 | #include <poll.h> | |
36 | #include <signal.h> | |
e3bff60a | 37 | #include <sys/ioctl.h> |
db2df898 | 38 | #include <sys/types.h> |
e3bff60a | 39 | #include <termios.h> |
db2df898 | 40 | #include <unistd.h> |
e3bff60a | 41 | |
db2df898 | 42 | #include "alloc-util.h" |
8a584da2 | 43 | #include "env-util.h" |
db2df898 MP |
44 | #include "fd-util.h" |
45 | #include "fileio.h" | |
46 | #include "fs-util.h" | |
47 | #include "io-util.h" | |
4c89c718 MP |
48 | #include "log.h" |
49 | #include "macro.h" | |
db2df898 | 50 | #include "parse-util.h" |
db2df898 MP |
51 | #include "process-util.h" |
52 | #include "socket-util.h" | |
53 | #include "stat-util.h" | |
54 | #include "string-util.h" | |
5a920b42 | 55 | #include "strv.h" |
e3bff60a MP |
56 | #include "terminal-util.h" |
57 | #include "time-util.h" | |
e3bff60a | 58 | #include "util.h" |
f5e65279 | 59 | #include "path-util.h" |
e3bff60a MP |
60 | |
61 | static volatile unsigned cached_columns = 0; | |
62 | static volatile unsigned cached_lines = 0; | |
63 | ||
64 | int chvt(int vt) { | |
65 | _cleanup_close_ int fd; | |
66 | ||
13d276d0 | 67 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
e3bff60a MP |
68 | if (fd < 0) |
69 | return -errno; | |
70 | ||
6300502b | 71 | if (vt <= 0) { |
e3bff60a MP |
72 | int tiocl[2] = { |
73 | TIOCL_GETKMSGREDIRECT, | |
74 | 0 | |
75 | }; | |
76 | ||
77 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
78 | return -errno; | |
79 | ||
80 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
81 | } | |
82 | ||
83 | if (ioctl(fd, VT_ACTIVATE, vt) < 0) | |
84 | return -errno; | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { | |
90 | struct termios old_termios, new_termios; | |
91 | char c, line[LINE_MAX]; | |
92 | ||
93 | assert(f); | |
94 | assert(ret); | |
95 | ||
96 | if (tcgetattr(fileno(f), &old_termios) >= 0) { | |
97 | new_termios = old_termios; | |
98 | ||
99 | new_termios.c_lflag &= ~ICANON; | |
100 | new_termios.c_cc[VMIN] = 1; | |
101 | new_termios.c_cc[VTIME] = 0; | |
102 | ||
103 | if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) { | |
104 | size_t k; | |
105 | ||
106 | if (t != USEC_INFINITY) { | |
107 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) { | |
108 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
109 | return -ETIMEDOUT; | |
110 | } | |
111 | } | |
112 | ||
113 | k = fread(&c, 1, 1, f); | |
114 | ||
115 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
116 | ||
117 | if (k <= 0) | |
118 | return -EIO; | |
119 | ||
120 | if (need_nl) | |
121 | *need_nl = c != '\n'; | |
122 | ||
123 | *ret = c; | |
124 | return 0; | |
125 | } | |
126 | } | |
127 | ||
128 | if (t != USEC_INFINITY) { | |
129 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) | |
130 | return -ETIMEDOUT; | |
131 | } | |
132 | ||
133 | errno = 0; | |
134 | if (!fgets(line, sizeof(line), f)) | |
4c89c718 | 135 | return errno > 0 ? -errno : -EIO; |
e3bff60a MP |
136 | |
137 | truncate_nl(line); | |
138 | ||
139 | if (strlen(line) != 1) | |
140 | return -EBADMSG; | |
141 | ||
142 | if (need_nl) | |
143 | *need_nl = false; | |
144 | ||
145 | *ret = line[0]; | |
146 | return 0; | |
147 | } | |
148 | ||
2897b343 MP |
149 | #define DEFAULT_ASK_REFRESH_USEC (2*USEC_PER_SEC) |
150 | ||
151 | int ask_char(char *ret, const char *replies, const char *fmt, ...) { | |
e3bff60a MP |
152 | int r; |
153 | ||
154 | assert(ret); | |
155 | assert(replies); | |
2897b343 | 156 | assert(fmt); |
e3bff60a MP |
157 | |
158 | for (;;) { | |
159 | va_list ap; | |
160 | char c; | |
161 | bool need_nl = true; | |
162 | ||
5a920b42 | 163 | if (colors_enabled()) |
6300502b | 164 | fputs(ANSI_HIGHLIGHT, stdout); |
e3bff60a | 165 | |
2897b343 MP |
166 | putchar('\r'); |
167 | ||
168 | va_start(ap, fmt); | |
169 | vprintf(fmt, ap); | |
e3bff60a MP |
170 | va_end(ap); |
171 | ||
5a920b42 | 172 | if (colors_enabled()) |
6300502b | 173 | fputs(ANSI_NORMAL, stdout); |
e3bff60a MP |
174 | |
175 | fflush(stdout); | |
176 | ||
2897b343 | 177 | r = read_one_char(stdin, &c, DEFAULT_ASK_REFRESH_USEC, &need_nl); |
e3bff60a MP |
178 | if (r < 0) { |
179 | ||
2897b343 MP |
180 | if (r == -ETIMEDOUT) |
181 | continue; | |
182 | ||
e3bff60a MP |
183 | if (r == -EBADMSG) { |
184 | puts("Bad input, please try again."); | |
185 | continue; | |
186 | } | |
187 | ||
188 | putchar('\n'); | |
189 | return r; | |
190 | } | |
191 | ||
192 | if (need_nl) | |
193 | putchar('\n'); | |
194 | ||
195 | if (strchr(replies, c)) { | |
196 | *ret = c; | |
197 | return 0; | |
198 | } | |
199 | ||
200 | puts("Read unexpected character, please try again."); | |
201 | } | |
202 | } | |
203 | ||
204 | int ask_string(char **ret, const char *text, ...) { | |
205 | assert(ret); | |
206 | assert(text); | |
207 | ||
208 | for (;;) { | |
209 | char line[LINE_MAX]; | |
210 | va_list ap; | |
211 | ||
5a920b42 | 212 | if (colors_enabled()) |
6300502b | 213 | fputs(ANSI_HIGHLIGHT, stdout); |
e3bff60a MP |
214 | |
215 | va_start(ap, text); | |
216 | vprintf(text, ap); | |
217 | va_end(ap); | |
218 | ||
5a920b42 | 219 | if (colors_enabled()) |
6300502b | 220 | fputs(ANSI_NORMAL, stdout); |
e3bff60a MP |
221 | |
222 | fflush(stdout); | |
223 | ||
224 | errno = 0; | |
225 | if (!fgets(line, sizeof(line), stdin)) | |
4c89c718 | 226 | return errno > 0 ? -errno : -EIO; |
e3bff60a MP |
227 | |
228 | if (!endswith(line, "\n")) | |
229 | putchar('\n'); | |
230 | else { | |
231 | char *s; | |
232 | ||
233 | if (isempty(line)) | |
234 | continue; | |
235 | ||
236 | truncate_nl(line); | |
237 | s = strdup(line); | |
238 | if (!s) | |
239 | return -ENOMEM; | |
240 | ||
241 | *ret = s; | |
242 | return 0; | |
243 | } | |
244 | } | |
245 | } | |
246 | ||
247 | int reset_terminal_fd(int fd, bool switch_to_text) { | |
248 | struct termios termios; | |
249 | int r = 0; | |
250 | ||
251 | /* Set terminal to some sane defaults */ | |
252 | ||
253 | assert(fd >= 0); | |
254 | ||
255 | /* We leave locked terminal attributes untouched, so that | |
256 | * Plymouth may set whatever it wants to set, and we don't | |
257 | * interfere with that. */ | |
258 | ||
259 | /* Disable exclusive mode, just in case */ | |
13d276d0 | 260 | (void) ioctl(fd, TIOCNXCL); |
e3bff60a MP |
261 | |
262 | /* Switch to text mode */ | |
263 | if (switch_to_text) | |
13d276d0 | 264 | (void) ioctl(fd, KDSETMODE, KD_TEXT); |
e3bff60a | 265 | |
f5e65279 MB |
266 | /* Set default keyboard mode */ |
267 | (void) vt_reset_keyboard(fd); | |
e3bff60a MP |
268 | |
269 | if (tcgetattr(fd, &termios) < 0) { | |
270 | r = -errno; | |
271 | goto finish; | |
272 | } | |
273 | ||
274 | /* We only reset the stuff that matters to the software. How | |
275 | * hardware is set up we don't touch assuming that somebody | |
276 | * else will do that for us */ | |
277 | ||
278 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
279 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
280 | termios.c_oflag |= ONLCR; | |
281 | termios.c_cflag |= CREAD; | |
282 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
283 | ||
284 | termios.c_cc[VINTR] = 03; /* ^C */ | |
285 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
286 | termios.c_cc[VERASE] = 0177; | |
287 | termios.c_cc[VKILL] = 025; /* ^X */ | |
288 | termios.c_cc[VEOF] = 04; /* ^D */ | |
289 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
290 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
291 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
292 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
293 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
294 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
295 | termios.c_cc[VEOL] = 0; | |
296 | termios.c_cc[VEOL2] = 0; | |
297 | ||
298 | termios.c_cc[VTIME] = 0; | |
299 | termios.c_cc[VMIN] = 1; | |
300 | ||
301 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
302 | r = -errno; | |
303 | ||
304 | finish: | |
305 | /* Just in case, flush all crap out */ | |
13d276d0 | 306 | (void) tcflush(fd, TCIOFLUSH); |
e3bff60a MP |
307 | |
308 | return r; | |
309 | } | |
310 | ||
311 | int reset_terminal(const char *name) { | |
312 | _cleanup_close_ int fd = -1; | |
313 | ||
13d276d0 MP |
314 | /* We open the terminal with O_NONBLOCK here, to ensure we |
315 | * don't block on carrier if this is a terminal with carrier | |
316 | * configured. */ | |
317 | ||
318 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
e3bff60a MP |
319 | if (fd < 0) |
320 | return fd; | |
321 | ||
322 | return reset_terminal_fd(fd, true); | |
323 | } | |
324 | ||
325 | int open_terminal(const char *name, int mode) { | |
326 | int fd, r; | |
327 | unsigned c = 0; | |
328 | ||
329 | /* | |
330 | * If a TTY is in the process of being closed opening it might | |
331 | * cause EIO. This is horribly awful, but unlikely to be | |
332 | * changed in the kernel. Hence we work around this problem by | |
333 | * retrying a couple of times. | |
334 | * | |
335 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
336 | */ | |
337 | ||
13d276d0 MP |
338 | if (mode & O_CREAT) |
339 | return -EINVAL; | |
e3bff60a MP |
340 | |
341 | for (;;) { | |
342 | fd = open(name, mode, 0); | |
343 | if (fd >= 0) | |
344 | break; | |
345 | ||
346 | if (errno != EIO) | |
347 | return -errno; | |
348 | ||
349 | /* Max 1s in total */ | |
350 | if (c >= 20) | |
351 | return -errno; | |
352 | ||
353 | usleep(50 * USEC_PER_MSEC); | |
354 | c++; | |
355 | } | |
356 | ||
357 | r = isatty(fd); | |
8a584da2 | 358 | if (r == 0) { |
e3bff60a MP |
359 | safe_close(fd); |
360 | return -ENOTTY; | |
361 | } | |
362 | ||
363 | return fd; | |
364 | } | |
365 | ||
366 | int acquire_terminal( | |
367 | const char *name, | |
368 | bool fail, | |
369 | bool force, | |
370 | bool ignore_tiocstty_eperm, | |
371 | usec_t timeout) { | |
372 | ||
373 | int fd = -1, notify = -1, r = 0, wd = -1; | |
374 | usec_t ts = 0; | |
375 | ||
376 | assert(name); | |
377 | ||
378 | /* We use inotify to be notified when the tty is closed. We | |
379 | * create the watch before checking if we can actually acquire | |
380 | * it, so that we don't lose any event. | |
381 | * | |
382 | * Note: strictly speaking this actually watches for the | |
383 | * device being closed, it does *not* really watch whether a | |
384 | * tty loses its controlling process. However, unless some | |
385 | * rogue process uses TIOCNOTTY on /dev/tty *after* closing | |
386 | * its tty otherwise this will not become a problem. As long | |
387 | * as the administrator makes sure not configure any service | |
388 | * on the same tty as an untrusted user this should not be a | |
389 | * problem. (Which he probably should not do anyway.) */ | |
390 | ||
391 | if (timeout != USEC_INFINITY) | |
392 | ts = now(CLOCK_MONOTONIC); | |
393 | ||
394 | if (!fail && !force) { | |
395 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); | |
396 | if (notify < 0) { | |
397 | r = -errno; | |
398 | goto fail; | |
399 | } | |
400 | ||
401 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
402 | if (wd < 0) { | |
403 | r = -errno; | |
404 | goto fail; | |
405 | } | |
406 | } | |
407 | ||
408 | for (;;) { | |
409 | struct sigaction sa_old, sa_new = { | |
410 | .sa_handler = SIG_IGN, | |
411 | .sa_flags = SA_RESTART, | |
412 | }; | |
413 | ||
414 | if (notify >= 0) { | |
415 | r = flush_fd(notify); | |
416 | if (r < 0) | |
417 | goto fail; | |
418 | } | |
419 | ||
420 | /* We pass here O_NOCTTY only so that we can check the return | |
421 | * value TIOCSCTTY and have a reliable way to figure out if we | |
422 | * successfully became the controlling process of the tty */ | |
423 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
424 | if (fd < 0) | |
425 | return fd; | |
426 | ||
427 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
428 | * if we already own the tty. */ | |
429 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
430 | ||
431 | /* First, try to get the tty */ | |
432 | if (ioctl(fd, TIOCSCTTY, force) < 0) | |
433 | r = -errno; | |
434 | ||
435 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
436 | ||
db2df898 | 437 | /* Sometimes, it makes sense to ignore TIOCSCTTY |
e3bff60a MP |
438 | * returning EPERM, i.e. when very likely we already |
439 | * are have this controlling terminal. */ | |
440 | if (r < 0 && r == -EPERM && ignore_tiocstty_eperm) | |
441 | r = 0; | |
442 | ||
13d276d0 | 443 | if (r < 0 && (force || fail || r != -EPERM)) |
e3bff60a | 444 | goto fail; |
e3bff60a MP |
445 | |
446 | if (r >= 0) | |
447 | break; | |
448 | ||
449 | assert(!fail); | |
450 | assert(!force); | |
451 | assert(notify >= 0); | |
452 | ||
453 | for (;;) { | |
454 | union inotify_event_buffer buffer; | |
455 | struct inotify_event *e; | |
456 | ssize_t l; | |
457 | ||
458 | if (timeout != USEC_INFINITY) { | |
459 | usec_t n; | |
460 | ||
461 | n = now(CLOCK_MONOTONIC); | |
462 | if (ts + timeout < n) { | |
463 | r = -ETIMEDOUT; | |
464 | goto fail; | |
465 | } | |
466 | ||
2897b343 | 467 | r = fd_wait_for_event(notify, POLLIN, ts + timeout - n); |
e3bff60a MP |
468 | if (r < 0) |
469 | goto fail; | |
470 | ||
471 | if (r == 0) { | |
472 | r = -ETIMEDOUT; | |
473 | goto fail; | |
474 | } | |
475 | } | |
476 | ||
477 | l = read(notify, &buffer, sizeof(buffer)); | |
478 | if (l < 0) { | |
f5e65279 | 479 | if (IN_SET(errno, EINTR, EAGAIN)) |
e3bff60a MP |
480 | continue; |
481 | ||
482 | r = -errno; | |
483 | goto fail; | |
484 | } | |
485 | ||
486 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
487 | if (e->wd != wd || !(e->mask & IN_CLOSE)) { | |
488 | r = -EIO; | |
489 | goto fail; | |
490 | } | |
491 | } | |
492 | ||
493 | break; | |
494 | } | |
495 | ||
496 | /* We close the tty fd here since if the old session | |
497 | * ended our handle will be dead. It's important that | |
498 | * we do this after sleeping, so that we don't enter | |
499 | * an endless loop. */ | |
500 | fd = safe_close(fd); | |
501 | } | |
502 | ||
503 | safe_close(notify); | |
504 | ||
e3bff60a MP |
505 | return fd; |
506 | ||
507 | fail: | |
508 | safe_close(fd); | |
509 | safe_close(notify); | |
510 | ||
511 | return r; | |
512 | } | |
513 | ||
514 | int release_terminal(void) { | |
515 | static const struct sigaction sa_new = { | |
516 | .sa_handler = SIG_IGN, | |
517 | .sa_flags = SA_RESTART, | |
518 | }; | |
519 | ||
520 | _cleanup_close_ int fd = -1; | |
521 | struct sigaction sa_old; | |
522 | int r = 0; | |
523 | ||
13d276d0 | 524 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
e3bff60a MP |
525 | if (fd < 0) |
526 | return -errno; | |
527 | ||
528 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
529 | * by our own TIOCNOTTY */ | |
530 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
531 | ||
532 | if (ioctl(fd, TIOCNOTTY) < 0) | |
533 | r = -errno; | |
534 | ||
535 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
536 | ||
537 | return r; | |
538 | } | |
539 | ||
540 | int terminal_vhangup_fd(int fd) { | |
541 | assert(fd >= 0); | |
542 | ||
543 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
544 | return -errno; | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
549 | int terminal_vhangup(const char *name) { | |
550 | _cleanup_close_ int fd; | |
551 | ||
13d276d0 | 552 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
e3bff60a MP |
553 | if (fd < 0) |
554 | return fd; | |
555 | ||
556 | return terminal_vhangup_fd(fd); | |
557 | } | |
558 | ||
559 | int vt_disallocate(const char *name) { | |
db2df898 | 560 | _cleanup_close_ int fd = -1; |
f5e65279 | 561 | const char *e, *n; |
e3bff60a | 562 | unsigned u; |
db2df898 | 563 | int r; |
e3bff60a MP |
564 | |
565 | /* Deallocate the VT if possible. If not possible | |
566 | * (i.e. because it is the active one), at least clear it | |
567 | * entirely (including the scrollback buffer) */ | |
568 | ||
f5e65279 MB |
569 | e = path_startswith(name, "/dev/"); |
570 | if (!e) | |
e3bff60a MP |
571 | return -EINVAL; |
572 | ||
573 | if (!tty_is_vc(name)) { | |
574 | /* So this is not a VT. I guess we cannot deallocate | |
575 | * it then. But let's at least clear the screen */ | |
576 | ||
577 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
578 | if (fd < 0) | |
579 | return fd; | |
580 | ||
581 | loop_write(fd, | |
582 | "\033[r" /* clear scrolling region */ | |
583 | "\033[H" /* move home */ | |
584 | "\033[2J", /* clear screen */ | |
585 | 10, false); | |
e3bff60a MP |
586 | return 0; |
587 | } | |
588 | ||
f5e65279 MB |
589 | n = startswith(e, "tty"); |
590 | if (!n) | |
e3bff60a MP |
591 | return -EINVAL; |
592 | ||
f5e65279 | 593 | r = safe_atou(n, &u); |
e3bff60a MP |
594 | if (r < 0) |
595 | return r; | |
596 | ||
597 | if (u <= 0) | |
598 | return -EINVAL; | |
599 | ||
600 | /* Try to deallocate */ | |
13d276d0 | 601 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
e3bff60a MP |
602 | if (fd < 0) |
603 | return fd; | |
604 | ||
605 | r = ioctl(fd, VT_DISALLOCATE, u); | |
db2df898 | 606 | fd = safe_close(fd); |
e3bff60a MP |
607 | |
608 | if (r >= 0) | |
609 | return 0; | |
610 | ||
611 | if (errno != EBUSY) | |
612 | return -errno; | |
613 | ||
614 | /* Couldn't deallocate, so let's clear it fully with | |
615 | * scrollback */ | |
616 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
617 | if (fd < 0) | |
618 | return fd; | |
619 | ||
620 | loop_write(fd, | |
621 | "\033[r" /* clear scrolling region */ | |
622 | "\033[H" /* move home */ | |
623 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
624 | 10, false); | |
e3bff60a MP |
625 | return 0; |
626 | } | |
627 | ||
e3bff60a MP |
628 | int make_console_stdio(void) { |
629 | int fd, r; | |
630 | ||
631 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr */ | |
632 | ||
633 | fd = acquire_terminal("/dev/console", false, true, true, USEC_INFINITY); | |
634 | if (fd < 0) | |
635 | return log_error_errno(fd, "Failed to acquire terminal: %m"); | |
636 | ||
db2df898 MP |
637 | r = reset_terminal_fd(fd, true); |
638 | if (r < 0) | |
639 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
640 | ||
e3bff60a MP |
641 | r = make_stdio(fd); |
642 | if (r < 0) | |
643 | return log_error_errno(r, "Failed to duplicate terminal fd: %m"); | |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
e3bff60a MP |
648 | bool tty_is_vc(const char *tty) { |
649 | assert(tty); | |
650 | ||
651 | return vtnr_from_tty(tty) >= 0; | |
652 | } | |
653 | ||
654 | bool tty_is_console(const char *tty) { | |
655 | assert(tty); | |
656 | ||
f5e65279 | 657 | return streq(skip_dev_prefix(tty), "console"); |
e3bff60a MP |
658 | } |
659 | ||
660 | int vtnr_from_tty(const char *tty) { | |
661 | int i, r; | |
662 | ||
663 | assert(tty); | |
664 | ||
f5e65279 | 665 | tty = skip_dev_prefix(tty); |
e3bff60a MP |
666 | |
667 | if (!startswith(tty, "tty") ) | |
668 | return -EINVAL; | |
669 | ||
670 | if (tty[3] < '0' || tty[3] > '9') | |
671 | return -EINVAL; | |
672 | ||
673 | r = safe_atoi(tty+3, &i); | |
674 | if (r < 0) | |
675 | return r; | |
676 | ||
677 | if (i < 0 || i > 63) | |
678 | return -EINVAL; | |
679 | ||
680 | return i; | |
681 | } | |
682 | ||
683 | char *resolve_dev_console(char **active) { | |
684 | char *tty; | |
685 | ||
686 | /* Resolve where /dev/console is pointing to, if /sys is actually ours | |
687 | * (i.e. not read-only-mounted which is a sign for container setups) */ | |
688 | ||
689 | if (path_is_read_only_fs("/sys") > 0) | |
690 | return NULL; | |
691 | ||
692 | if (read_one_line_file("/sys/class/tty/console/active", active) < 0) | |
693 | return NULL; | |
694 | ||
695 | /* If multiple log outputs are configured the last one is what | |
696 | * /dev/console points to */ | |
697 | tty = strrchr(*active, ' '); | |
698 | if (tty) | |
699 | tty++; | |
700 | else | |
701 | tty = *active; | |
702 | ||
703 | if (streq(tty, "tty0")) { | |
704 | char *tmp; | |
705 | ||
706 | /* Get the active VC (e.g. tty1) */ | |
707 | if (read_one_line_file("/sys/class/tty/tty0/active", &tmp) >= 0) { | |
708 | free(*active); | |
709 | tty = *active = tmp; | |
710 | } | |
711 | } | |
712 | ||
713 | return tty; | |
714 | } | |
715 | ||
5a920b42 MP |
716 | int get_kernel_consoles(char ***consoles) { |
717 | _cleanup_strv_free_ char **con = NULL; | |
718 | _cleanup_free_ char *line = NULL; | |
719 | const char *active; | |
720 | int r; | |
721 | ||
722 | assert(consoles); | |
723 | ||
724 | r = read_one_line_file("/sys/class/tty/console/active", &line); | |
725 | if (r < 0) | |
726 | return r; | |
727 | ||
728 | active = line; | |
729 | for (;;) { | |
730 | _cleanup_free_ char *tty = NULL; | |
731 | char *path; | |
732 | ||
733 | r = extract_first_word(&active, &tty, NULL, 0); | |
734 | if (r < 0) | |
735 | return r; | |
736 | if (r == 0) | |
737 | break; | |
738 | ||
739 | if (streq(tty, "tty0")) { | |
740 | tty = mfree(tty); | |
741 | r = read_one_line_file("/sys/class/tty/tty0/active", &tty); | |
742 | if (r < 0) | |
743 | return r; | |
744 | } | |
745 | ||
746 | path = strappend("/dev/", tty); | |
747 | if (!path) | |
748 | return -ENOMEM; | |
749 | ||
750 | if (access(path, F_OK) < 0) { | |
751 | log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path); | |
752 | free(path); | |
753 | continue; | |
754 | } | |
755 | ||
756 | r = strv_consume(&con, path); | |
757 | if (r < 0) | |
758 | return r; | |
759 | } | |
760 | ||
761 | if (strv_isempty(con)) { | |
762 | log_debug("No devices found for system console"); | |
763 | ||
764 | r = strv_extend(&con, "/dev/console"); | |
765 | if (r < 0) | |
766 | return r; | |
767 | } | |
768 | ||
769 | *consoles = con; | |
770 | con = NULL; | |
771 | return 0; | |
772 | } | |
773 | ||
e3bff60a MP |
774 | bool tty_is_vc_resolve(const char *tty) { |
775 | _cleanup_free_ char *active = NULL; | |
776 | ||
777 | assert(tty); | |
778 | ||
f5e65279 | 779 | tty = skip_dev_prefix(tty); |
e3bff60a MP |
780 | |
781 | if (streq(tty, "console")) { | |
782 | tty = resolve_dev_console(&active); | |
783 | if (!tty) | |
784 | return false; | |
785 | } | |
786 | ||
787 | return tty_is_vc(tty); | |
788 | } | |
789 | ||
790 | const char *default_term_for_tty(const char *tty) { | |
8a584da2 | 791 | return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220"; |
e3bff60a MP |
792 | } |
793 | ||
794 | int fd_columns(int fd) { | |
795 | struct winsize ws = {}; | |
796 | ||
797 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
798 | return -errno; | |
799 | ||
800 | if (ws.ws_col <= 0) | |
801 | return -EIO; | |
802 | ||
803 | return ws.ws_col; | |
804 | } | |
805 | ||
806 | unsigned columns(void) { | |
807 | const char *e; | |
808 | int c; | |
809 | ||
810 | if (_likely_(cached_columns > 0)) | |
811 | return cached_columns; | |
812 | ||
813 | c = 0; | |
814 | e = getenv("COLUMNS"); | |
815 | if (e) | |
816 | (void) safe_atoi(e, &c); | |
817 | ||
818 | if (c <= 0) | |
819 | c = fd_columns(STDOUT_FILENO); | |
820 | ||
821 | if (c <= 0) | |
822 | c = 80; | |
823 | ||
824 | cached_columns = c; | |
825 | return cached_columns; | |
826 | } | |
827 | ||
828 | int fd_lines(int fd) { | |
829 | struct winsize ws = {}; | |
830 | ||
831 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
832 | return -errno; | |
833 | ||
834 | if (ws.ws_row <= 0) | |
835 | return -EIO; | |
836 | ||
837 | return ws.ws_row; | |
838 | } | |
839 | ||
840 | unsigned lines(void) { | |
841 | const char *e; | |
842 | int l; | |
843 | ||
844 | if (_likely_(cached_lines > 0)) | |
845 | return cached_lines; | |
846 | ||
847 | l = 0; | |
848 | e = getenv("LINES"); | |
849 | if (e) | |
850 | (void) safe_atoi(e, &l); | |
851 | ||
852 | if (l <= 0) | |
853 | l = fd_lines(STDOUT_FILENO); | |
854 | ||
855 | if (l <= 0) | |
856 | l = 24; | |
857 | ||
858 | cached_lines = l; | |
859 | return cached_lines; | |
860 | } | |
861 | ||
862 | /* intended to be used as a SIGWINCH sighandler */ | |
863 | void columns_lines_cache_reset(int signum) { | |
864 | cached_columns = 0; | |
865 | cached_lines = 0; | |
866 | } | |
867 | ||
868 | bool on_tty(void) { | |
869 | static int cached_on_tty = -1; | |
870 | ||
871 | if (_unlikely_(cached_on_tty < 0)) | |
872 | cached_on_tty = isatty(STDOUT_FILENO) > 0; | |
873 | ||
874 | return cached_on_tty; | |
875 | } | |
876 | ||
877 | int make_stdio(int fd) { | |
878 | int r, s, t; | |
879 | ||
880 | assert(fd >= 0); | |
881 | ||
882 | r = dup2(fd, STDIN_FILENO); | |
883 | s = dup2(fd, STDOUT_FILENO); | |
884 | t = dup2(fd, STDERR_FILENO); | |
885 | ||
886 | if (fd >= 3) | |
887 | safe_close(fd); | |
888 | ||
889 | if (r < 0 || s < 0 || t < 0) | |
890 | return -errno; | |
891 | ||
892 | /* Explicitly unset O_CLOEXEC, since if fd was < 3, then | |
893 | * dup2() was a NOP and the bit hence possibly set. */ | |
5a920b42 | 894 | stdio_unset_cloexec(); |
e3bff60a MP |
895 | |
896 | return 0; | |
897 | } | |
898 | ||
899 | int make_null_stdio(void) { | |
900 | int null_fd; | |
901 | ||
902 | null_fd = open("/dev/null", O_RDWR|O_NOCTTY); | |
903 | if (null_fd < 0) | |
904 | return -errno; | |
905 | ||
906 | return make_stdio(null_fd); | |
907 | } | |
908 | ||
909 | int getttyname_malloc(int fd, char **ret) { | |
910 | size_t l = 100; | |
911 | int r; | |
912 | ||
913 | assert(fd >= 0); | |
914 | assert(ret); | |
915 | ||
916 | for (;;) { | |
917 | char path[l]; | |
918 | ||
919 | r = ttyname_r(fd, path, sizeof(path)); | |
920 | if (r == 0) { | |
e3bff60a MP |
921 | char *c; |
922 | ||
f5e65279 | 923 | c = strdup(skip_dev_prefix(path)); |
e3bff60a MP |
924 | if (!c) |
925 | return -ENOMEM; | |
926 | ||
927 | *ret = c; | |
928 | return 0; | |
929 | } | |
930 | ||
931 | if (r != ERANGE) | |
932 | return -r; | |
933 | ||
934 | l *= 2; | |
935 | } | |
936 | ||
937 | return 0; | |
938 | } | |
939 | ||
940 | int getttyname_harder(int fd, char **r) { | |
941 | int k; | |
942 | char *s = NULL; | |
943 | ||
944 | k = getttyname_malloc(fd, &s); | |
945 | if (k < 0) | |
946 | return k; | |
947 | ||
948 | if (streq(s, "tty")) { | |
949 | free(s); | |
950 | return get_ctty(0, NULL, r); | |
951 | } | |
952 | ||
953 | *r = s; | |
954 | return 0; | |
955 | } | |
956 | ||
957 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
958 | int r; | |
959 | _cleanup_free_ char *line = NULL; | |
960 | const char *p; | |
961 | unsigned long ttynr; | |
962 | ||
963 | assert(pid >= 0); | |
964 | ||
965 | p = procfs_file_alloca(pid, "stat"); | |
966 | r = read_one_line_file(p, &line); | |
967 | if (r < 0) | |
968 | return r; | |
969 | ||
970 | p = strrchr(line, ')'); | |
971 | if (!p) | |
972 | return -EIO; | |
973 | ||
974 | p++; | |
975 | ||
976 | if (sscanf(p, " " | |
977 | "%*c " /* state */ | |
978 | "%*d " /* ppid */ | |
979 | "%*d " /* pgrp */ | |
980 | "%*d " /* session */ | |
981 | "%lu ", /* ttynr */ | |
982 | &ttynr) != 1) | |
983 | return -EIO; | |
984 | ||
985 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
986 | return -ENXIO; | |
987 | ||
988 | if (d) | |
989 | *d = (dev_t) ttynr; | |
990 | ||
991 | return 0; | |
992 | } | |
993 | ||
994 | int get_ctty(pid_t pid, dev_t *_devnr, char **r) { | |
52ad194e | 995 | char fn[STRLEN("/dev/char/") + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL; |
e3bff60a MP |
996 | _cleanup_free_ char *s = NULL; |
997 | const char *p; | |
998 | dev_t devnr; | |
999 | int k; | |
1000 | ||
1001 | assert(r); | |
1002 | ||
1003 | k = get_ctty_devnr(pid, &devnr); | |
1004 | if (k < 0) | |
1005 | return k; | |
1006 | ||
1007 | sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr)); | |
1008 | ||
1009 | k = readlink_malloc(fn, &s); | |
1010 | if (k < 0) { | |
1011 | ||
1012 | if (k != -ENOENT) | |
1013 | return k; | |
1014 | ||
1015 | /* This is an ugly hack */ | |
1016 | if (major(devnr) == 136) { | |
1017 | if (asprintf(&b, "pts/%u", minor(devnr)) < 0) | |
1018 | return -ENOMEM; | |
1019 | } else { | |
1020 | /* Probably something like the ptys which have no | |
1021 | * symlink in /dev/char. Let's return something | |
1022 | * vaguely useful. */ | |
1023 | ||
1024 | b = strdup(fn + 5); | |
1025 | if (!b) | |
1026 | return -ENOMEM; | |
1027 | } | |
1028 | } else { | |
1029 | if (startswith(s, "/dev/")) | |
1030 | p = s + 5; | |
1031 | else if (startswith(s, "../")) | |
1032 | p = s + 3; | |
1033 | else | |
1034 | p = s; | |
1035 | ||
1036 | b = strdup(p); | |
1037 | if (!b) | |
1038 | return -ENOMEM; | |
1039 | } | |
1040 | ||
1041 | *r = b; | |
1042 | if (_devnr) | |
1043 | *_devnr = devnr; | |
1044 | ||
1045 | return 0; | |
1046 | } | |
d9dfd233 | 1047 | |
db2df898 MP |
1048 | int ptsname_malloc(int fd, char **ret) { |
1049 | size_t l = 100; | |
1050 | ||
1051 | assert(fd >= 0); | |
1052 | assert(ret); | |
1053 | ||
1054 | for (;;) { | |
1055 | char *c; | |
1056 | ||
1057 | c = new(char, l); | |
1058 | if (!c) | |
1059 | return -ENOMEM; | |
1060 | ||
1061 | if (ptsname_r(fd, c, l) == 0) { | |
1062 | *ret = c; | |
1063 | return 0; | |
1064 | } | |
1065 | if (errno != ERANGE) { | |
1066 | free(c); | |
1067 | return -errno; | |
1068 | } | |
1069 | ||
1070 | free(c); | |
1071 | l *= 2; | |
1072 | } | |
1073 | } | |
1074 | ||
d9dfd233 MP |
1075 | int ptsname_namespace(int pty, char **ret) { |
1076 | int no = -1, r; | |
1077 | ||
1078 | /* Like ptsname(), but doesn't assume that the path is | |
1079 | * accessible in the local namespace. */ | |
1080 | ||
1081 | r = ioctl(pty, TIOCGPTN, &no); | |
1082 | if (r < 0) | |
1083 | return -errno; | |
1084 | ||
1085 | if (no < 0) | |
1086 | return -EIO; | |
1087 | ||
1088 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1089 | return -ENOMEM; | |
1090 | ||
1091 | return 0; | |
1092 | } | |
db2df898 MP |
1093 | |
1094 | int openpt_in_namespace(pid_t pid, int flags) { | |
1095 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1096 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
1097 | siginfo_t si; | |
1098 | pid_t child; | |
1099 | int r; | |
1100 | ||
1101 | assert(pid > 0); | |
1102 | ||
1103 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1104 | if (r < 0) | |
1105 | return r; | |
1106 | ||
1107 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1108 | return -errno; | |
1109 | ||
1110 | child = fork(); | |
1111 | if (child < 0) | |
1112 | return -errno; | |
1113 | ||
1114 | if (child == 0) { | |
1115 | int master; | |
1116 | ||
1117 | pair[0] = safe_close(pair[0]); | |
1118 | ||
1119 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1120 | if (r < 0) | |
1121 | _exit(EXIT_FAILURE); | |
1122 | ||
1123 | master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); | |
1124 | if (master < 0) | |
1125 | _exit(EXIT_FAILURE); | |
1126 | ||
1127 | if (unlockpt(master) < 0) | |
1128 | _exit(EXIT_FAILURE); | |
1129 | ||
1130 | if (send_one_fd(pair[1], master, 0) < 0) | |
1131 | _exit(EXIT_FAILURE); | |
1132 | ||
1133 | _exit(EXIT_SUCCESS); | |
1134 | } | |
1135 | ||
1136 | pair[1] = safe_close(pair[1]); | |
1137 | ||
1138 | r = wait_for_terminate(child, &si); | |
1139 | if (r < 0) | |
1140 | return r; | |
1141 | if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS) | |
1142 | return -EIO; | |
1143 | ||
1144 | return receive_one_fd(pair[0], 0); | |
1145 | } | |
1146 | ||
1147 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
1148 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1149 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
1150 | siginfo_t si; | |
1151 | pid_t child; | |
1152 | int r; | |
1153 | ||
1154 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1155 | if (r < 0) | |
1156 | return r; | |
1157 | ||
1158 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1159 | return -errno; | |
1160 | ||
1161 | child = fork(); | |
1162 | if (child < 0) | |
1163 | return -errno; | |
1164 | ||
1165 | if (child == 0) { | |
1166 | int master; | |
1167 | ||
1168 | pair[0] = safe_close(pair[0]); | |
1169 | ||
1170 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1171 | if (r < 0) | |
1172 | _exit(EXIT_FAILURE); | |
1173 | ||
1174 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); | |
1175 | if (master < 0) | |
1176 | _exit(EXIT_FAILURE); | |
1177 | ||
1178 | if (send_one_fd(pair[1], master, 0) < 0) | |
1179 | _exit(EXIT_FAILURE); | |
1180 | ||
1181 | _exit(EXIT_SUCCESS); | |
1182 | } | |
1183 | ||
1184 | pair[1] = safe_close(pair[1]); | |
1185 | ||
1186 | r = wait_for_terminate(child, &si); | |
1187 | if (r < 0) | |
1188 | return r; | |
1189 | if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS) | |
1190 | return -EIO; | |
1191 | ||
1192 | return receive_one_fd(pair[0], 0); | |
1193 | } | |
4c89c718 | 1194 | |
8a584da2 | 1195 | static bool getenv_terminal_is_dumb(void) { |
5a920b42 MP |
1196 | const char *e; |
1197 | ||
5a920b42 MP |
1198 | e = getenv("TERM"); |
1199 | if (!e) | |
1200 | return true; | |
1201 | ||
1202 | return streq(e, "dumb"); | |
1203 | } | |
1204 | ||
8a584da2 MP |
1205 | bool terminal_is_dumb(void) { |
1206 | if (!on_tty()) | |
1207 | return true; | |
1208 | ||
1209 | return getenv_terminal_is_dumb(); | |
1210 | } | |
1211 | ||
4c89c718 | 1212 | bool colors_enabled(void) { |
aa27b158 | 1213 | static int enabled = -1; |
4c89c718 | 1214 | |
aa27b158 | 1215 | if (_unlikely_(enabled < 0)) { |
8a584da2 MP |
1216 | int val; |
1217 | ||
1218 | val = getenv_bool("SYSTEMD_COLORS"); | |
1219 | if (val >= 0) | |
1220 | enabled = val; | |
f5e65279 | 1221 | else if (getpid_cached() == 1) |
8a584da2 MP |
1222 | /* PID1 outputs to the console without holding it open all the time */ |
1223 | enabled = !getenv_terminal_is_dumb(); | |
aa27b158 | 1224 | else |
5a920b42 | 1225 | enabled = !terminal_is_dumb(); |
4c89c718 MP |
1226 | } |
1227 | ||
aa27b158 | 1228 | return enabled; |
4c89c718 | 1229 | } |
f5e65279 MB |
1230 | |
1231 | bool underline_enabled(void) { | |
1232 | static int enabled = -1; | |
1233 | ||
1234 | if (enabled < 0) { | |
1235 | ||
1236 | /* The Linux console doesn't support underlining, turn it off, but only there. */ | |
1237 | ||
1238 | if (!colors_enabled()) | |
1239 | enabled = false; | |
1240 | else | |
1241 | enabled = !streq_ptr(getenv("TERM"), "linux"); | |
1242 | } | |
1243 | ||
1244 | return enabled; | |
1245 | } | |
1246 | ||
1247 | int vt_default_utf8(void) { | |
1248 | _cleanup_free_ char *b = NULL; | |
1249 | int r; | |
1250 | ||
1251 | /* Read the default VT UTF8 setting from the kernel */ | |
1252 | ||
1253 | r = read_one_line_file("/sys/module/vt/parameters/default_utf8", &b); | |
1254 | if (r < 0) | |
1255 | return r; | |
1256 | ||
1257 | return parse_boolean(b); | |
1258 | } | |
1259 | ||
1260 | int vt_reset_keyboard(int fd) { | |
1261 | int kb; | |
1262 | ||
1263 | /* If we can't read the default, then default to unicode. It's 2017 after all. */ | |
1264 | kb = vt_default_utf8() != 0 ? K_UNICODE : K_XLATE; | |
1265 | ||
1266 | if (ioctl(fd, KDSKBMODE, kb) < 0) | |
1267 | return -errno; | |
1268 | ||
1269 | return 0; | |
1270 | } |