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Commit | Line | Data |
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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" |
acf553b0 | 42 | #include "env-util.h" |
3ffd4af2 | 43 | #include "fd-util.h" |
288a74cc | 44 | #include "fileio.h" |
f4f15635 | 45 | #include "fs-util.h" |
c004493c | 46 | #include "io-util.h" |
93cc7779 TA |
47 | #include "log.h" |
48 | #include "macro.h" | |
6bedfcbb | 49 | #include "parse-util.h" |
07630cea | 50 | #include "process-util.h" |
2583fbea | 51 | #include "socket-util.h" |
8fcde012 | 52 | #include "stat-util.h" |
07630cea | 53 | #include "string-util.h" |
6af62124 | 54 | #include "strv.h" |
3ffd4af2 | 55 | #include "terminal-util.h" |
07630cea LP |
56 | #include "time-util.h" |
57 | #include "util.h" | |
288a74cc RC |
58 | |
59 | static volatile unsigned cached_columns = 0; | |
60 | static volatile unsigned cached_lines = 0; | |
61 | ||
62 | int chvt(int vt) { | |
63 | _cleanup_close_ int fd; | |
64 | ||
0a8b555c | 65 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
66 | if (fd < 0) |
67 | return -errno; | |
68 | ||
b9e74c39 | 69 | if (vt <= 0) { |
288a74cc RC |
70 | int tiocl[2] = { |
71 | TIOCL_GETKMSGREDIRECT, | |
72 | 0 | |
73 | }; | |
74 | ||
75 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
76 | return -errno; | |
77 | ||
78 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
79 | } | |
80 | ||
81 | if (ioctl(fd, VT_ACTIVATE, vt) < 0) | |
82 | return -errno; | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { | |
88 | struct termios old_termios, new_termios; | |
89 | char c, line[LINE_MAX]; | |
90 | ||
91 | assert(f); | |
92 | assert(ret); | |
93 | ||
94 | if (tcgetattr(fileno(f), &old_termios) >= 0) { | |
95 | new_termios = old_termios; | |
96 | ||
97 | new_termios.c_lflag &= ~ICANON; | |
98 | new_termios.c_cc[VMIN] = 1; | |
99 | new_termios.c_cc[VTIME] = 0; | |
100 | ||
101 | if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) { | |
102 | size_t k; | |
103 | ||
104 | if (t != USEC_INFINITY) { | |
105 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) { | |
106 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
107 | return -ETIMEDOUT; | |
108 | } | |
109 | } | |
110 | ||
111 | k = fread(&c, 1, 1, f); | |
112 | ||
113 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
114 | ||
115 | if (k <= 0) | |
116 | return -EIO; | |
117 | ||
118 | if (need_nl) | |
119 | *need_nl = c != '\n'; | |
120 | ||
121 | *ret = c; | |
122 | return 0; | |
123 | } | |
124 | } | |
125 | ||
126 | if (t != USEC_INFINITY) { | |
127 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) | |
128 | return -ETIMEDOUT; | |
129 | } | |
130 | ||
131 | errno = 0; | |
132 | if (!fgets(line, sizeof(line), f)) | |
f5e5c28f | 133 | return errno > 0 ? -errno : -EIO; |
288a74cc RC |
134 | |
135 | truncate_nl(line); | |
136 | ||
137 | if (strlen(line) != 1) | |
138 | return -EBADMSG; | |
139 | ||
140 | if (need_nl) | |
141 | *need_nl = false; | |
142 | ||
143 | *ret = line[0]; | |
144 | return 0; | |
145 | } | |
146 | ||
3c670f89 FB |
147 | #define DEFAULT_ASK_REFRESH_USEC (2*USEC_PER_SEC) |
148 | ||
149 | int ask_char(char *ret, const char *replies, const char *fmt, ...) { | |
288a74cc RC |
150 | int r; |
151 | ||
152 | assert(ret); | |
153 | assert(replies); | |
3c670f89 | 154 | assert(fmt); |
288a74cc RC |
155 | |
156 | for (;;) { | |
157 | va_list ap; | |
158 | char c; | |
159 | bool need_nl = true; | |
160 | ||
7565bb98 | 161 | if (colors_enabled()) |
1fc464f6 | 162 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc | 163 | |
3c670f89 FB |
164 | putchar('\r'); |
165 | ||
166 | va_start(ap, fmt); | |
167 | vprintf(fmt, ap); | |
288a74cc RC |
168 | va_end(ap); |
169 | ||
7565bb98 | 170 | if (colors_enabled()) |
1fc464f6 | 171 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
172 | |
173 | fflush(stdout); | |
174 | ||
3c670f89 | 175 | r = read_one_char(stdin, &c, DEFAULT_ASK_REFRESH_USEC, &need_nl); |
288a74cc RC |
176 | if (r < 0) { |
177 | ||
3c670f89 FB |
178 | if (r == -ETIMEDOUT) |
179 | continue; | |
180 | ||
288a74cc RC |
181 | if (r == -EBADMSG) { |
182 | puts("Bad input, please try again."); | |
183 | continue; | |
184 | } | |
185 | ||
186 | putchar('\n'); | |
187 | return r; | |
188 | } | |
189 | ||
190 | if (need_nl) | |
191 | putchar('\n'); | |
192 | ||
193 | if (strchr(replies, c)) { | |
194 | *ret = c; | |
195 | return 0; | |
196 | } | |
197 | ||
198 | puts("Read unexpected character, please try again."); | |
199 | } | |
200 | } | |
201 | ||
202 | int ask_string(char **ret, const char *text, ...) { | |
203 | assert(ret); | |
204 | assert(text); | |
205 | ||
206 | for (;;) { | |
207 | char line[LINE_MAX]; | |
208 | va_list ap; | |
209 | ||
7565bb98 | 210 | if (colors_enabled()) |
1fc464f6 | 211 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc RC |
212 | |
213 | va_start(ap, text); | |
214 | vprintf(text, ap); | |
215 | va_end(ap); | |
216 | ||
7565bb98 | 217 | if (colors_enabled()) |
1fc464f6 | 218 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
219 | |
220 | fflush(stdout); | |
221 | ||
222 | errno = 0; | |
223 | if (!fgets(line, sizeof(line), stdin)) | |
f5e5c28f | 224 | return errno > 0 ? -errno : -EIO; |
288a74cc RC |
225 | |
226 | if (!endswith(line, "\n")) | |
227 | putchar('\n'); | |
228 | else { | |
229 | char *s; | |
230 | ||
231 | if (isempty(line)) | |
232 | continue; | |
233 | ||
234 | truncate_nl(line); | |
235 | s = strdup(line); | |
236 | if (!s) | |
237 | return -ENOMEM; | |
238 | ||
239 | *ret = s; | |
240 | return 0; | |
241 | } | |
242 | } | |
243 | } | |
244 | ||
245 | int reset_terminal_fd(int fd, bool switch_to_text) { | |
246 | struct termios termios; | |
247 | int r = 0; | |
248 | ||
249 | /* Set terminal to some sane defaults */ | |
250 | ||
251 | assert(fd >= 0); | |
252 | ||
253 | /* We leave locked terminal attributes untouched, so that | |
254 | * Plymouth may set whatever it wants to set, and we don't | |
255 | * interfere with that. */ | |
256 | ||
257 | /* Disable exclusive mode, just in case */ | |
7d927c9a | 258 | (void) ioctl(fd, TIOCNXCL); |
288a74cc RC |
259 | |
260 | /* Switch to text mode */ | |
261 | if (switch_to_text) | |
7d927c9a | 262 | (void) ioctl(fd, KDSETMODE, KD_TEXT); |
288a74cc RC |
263 | |
264 | /* Enable console unicode mode */ | |
7d927c9a | 265 | (void) ioctl(fd, KDSKBMODE, K_UNICODE); |
288a74cc RC |
266 | |
267 | if (tcgetattr(fd, &termios) < 0) { | |
268 | r = -errno; | |
269 | goto finish; | |
270 | } | |
271 | ||
272 | /* We only reset the stuff that matters to the software. How | |
273 | * hardware is set up we don't touch assuming that somebody | |
274 | * else will do that for us */ | |
275 | ||
276 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
277 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
278 | termios.c_oflag |= ONLCR; | |
279 | termios.c_cflag |= CREAD; | |
280 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
281 | ||
282 | termios.c_cc[VINTR] = 03; /* ^C */ | |
283 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
284 | termios.c_cc[VERASE] = 0177; | |
285 | termios.c_cc[VKILL] = 025; /* ^X */ | |
286 | termios.c_cc[VEOF] = 04; /* ^D */ | |
287 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
288 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
289 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
290 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
291 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
292 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
293 | termios.c_cc[VEOL] = 0; | |
294 | termios.c_cc[VEOL2] = 0; | |
295 | ||
296 | termios.c_cc[VTIME] = 0; | |
297 | termios.c_cc[VMIN] = 1; | |
298 | ||
299 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
300 | r = -errno; | |
301 | ||
302 | finish: | |
303 | /* Just in case, flush all crap out */ | |
7d927c9a | 304 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
305 | |
306 | return r; | |
307 | } | |
308 | ||
309 | int reset_terminal(const char *name) { | |
310 | _cleanup_close_ int fd = -1; | |
311 | ||
0a8b555c LP |
312 | /* We open the terminal with O_NONBLOCK here, to ensure we |
313 | * don't block on carrier if this is a terminal with carrier | |
314 | * configured. */ | |
315 | ||
316 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
317 | if (fd < 0) |
318 | return fd; | |
319 | ||
320 | return reset_terminal_fd(fd, true); | |
321 | } | |
322 | ||
323 | int open_terminal(const char *name, int mode) { | |
324 | int fd, r; | |
325 | unsigned c = 0; | |
326 | ||
327 | /* | |
328 | * If a TTY is in the process of being closed opening it might | |
329 | * cause EIO. This is horribly awful, but unlikely to be | |
330 | * changed in the kernel. Hence we work around this problem by | |
331 | * retrying a couple of times. | |
332 | * | |
333 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
334 | */ | |
335 | ||
35bdab77 LP |
336 | if (mode & O_CREAT) |
337 | return -EINVAL; | |
288a74cc RC |
338 | |
339 | for (;;) { | |
340 | fd = open(name, mode, 0); | |
341 | if (fd >= 0) | |
342 | break; | |
343 | ||
344 | if (errno != EIO) | |
345 | return -errno; | |
346 | ||
347 | /* Max 1s in total */ | |
348 | if (c >= 20) | |
349 | return -errno; | |
350 | ||
351 | usleep(50 * USEC_PER_MSEC); | |
352 | c++; | |
353 | } | |
354 | ||
355 | r = isatty(fd); | |
e6c9fa74 | 356 | if (r == 0) { |
288a74cc RC |
357 | safe_close(fd); |
358 | return -ENOTTY; | |
359 | } | |
360 | ||
361 | return fd; | |
362 | } | |
363 | ||
364 | int acquire_terminal( | |
365 | const char *name, | |
366 | bool fail, | |
367 | bool force, | |
368 | bool ignore_tiocstty_eperm, | |
369 | usec_t timeout) { | |
370 | ||
371 | int fd = -1, notify = -1, r = 0, wd = -1; | |
372 | usec_t ts = 0; | |
373 | ||
374 | assert(name); | |
375 | ||
376 | /* We use inotify to be notified when the tty is closed. We | |
377 | * create the watch before checking if we can actually acquire | |
378 | * it, so that we don't lose any event. | |
379 | * | |
380 | * Note: strictly speaking this actually watches for the | |
381 | * device being closed, it does *not* really watch whether a | |
382 | * tty loses its controlling process. However, unless some | |
383 | * rogue process uses TIOCNOTTY on /dev/tty *after* closing | |
384 | * its tty otherwise this will not become a problem. As long | |
385 | * as the administrator makes sure not configure any service | |
386 | * on the same tty as an untrusted user this should not be a | |
387 | * problem. (Which he probably should not do anyway.) */ | |
388 | ||
389 | if (timeout != USEC_INFINITY) | |
390 | ts = now(CLOCK_MONOTONIC); | |
391 | ||
392 | if (!fail && !force) { | |
393 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); | |
394 | if (notify < 0) { | |
395 | r = -errno; | |
396 | goto fail; | |
397 | } | |
398 | ||
399 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
400 | if (wd < 0) { | |
401 | r = -errno; | |
402 | goto fail; | |
403 | } | |
404 | } | |
405 | ||
406 | for (;;) { | |
407 | struct sigaction sa_old, sa_new = { | |
408 | .sa_handler = SIG_IGN, | |
409 | .sa_flags = SA_RESTART, | |
410 | }; | |
411 | ||
412 | if (notify >= 0) { | |
413 | r = flush_fd(notify); | |
414 | if (r < 0) | |
415 | goto fail; | |
416 | } | |
417 | ||
418 | /* We pass here O_NOCTTY only so that we can check the return | |
419 | * value TIOCSCTTY and have a reliable way to figure out if we | |
420 | * successfully became the controlling process of the tty */ | |
421 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
422 | if (fd < 0) | |
423 | return fd; | |
424 | ||
425 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
426 | * if we already own the tty. */ | |
427 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
428 | ||
429 | /* First, try to get the tty */ | |
430 | if (ioctl(fd, TIOCSCTTY, force) < 0) | |
431 | r = -errno; | |
432 | ||
433 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
434 | ||
b938cb90 | 435 | /* Sometimes, it makes sense to ignore TIOCSCTTY |
288a74cc RC |
436 | * returning EPERM, i.e. when very likely we already |
437 | * are have this controlling terminal. */ | |
438 | if (r < 0 && r == -EPERM && ignore_tiocstty_eperm) | |
439 | r = 0; | |
440 | ||
7d927c9a | 441 | if (r < 0 && (force || fail || r != -EPERM)) |
288a74cc | 442 | goto fail; |
288a74cc RC |
443 | |
444 | if (r >= 0) | |
445 | break; | |
446 | ||
447 | assert(!fail); | |
448 | assert(!force); | |
449 | assert(notify >= 0); | |
450 | ||
451 | for (;;) { | |
452 | union inotify_event_buffer buffer; | |
453 | struct inotify_event *e; | |
454 | ssize_t l; | |
455 | ||
456 | if (timeout != USEC_INFINITY) { | |
457 | usec_t n; | |
458 | ||
459 | n = now(CLOCK_MONOTONIC); | |
460 | if (ts + timeout < n) { | |
461 | r = -ETIMEDOUT; | |
462 | goto fail; | |
463 | } | |
464 | ||
f80da6f3 | 465 | r = fd_wait_for_event(notify, POLLIN, ts + timeout - n); |
288a74cc RC |
466 | if (r < 0) |
467 | goto fail; | |
468 | ||
469 | if (r == 0) { | |
470 | r = -ETIMEDOUT; | |
471 | goto fail; | |
472 | } | |
473 | } | |
474 | ||
475 | l = read(notify, &buffer, sizeof(buffer)); | |
476 | if (l < 0) { | |
477 | if (errno == EINTR || errno == EAGAIN) | |
478 | continue; | |
479 | ||
480 | r = -errno; | |
481 | goto fail; | |
482 | } | |
483 | ||
484 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
485 | if (e->wd != wd || !(e->mask & IN_CLOSE)) { | |
486 | r = -EIO; | |
487 | goto fail; | |
488 | } | |
489 | } | |
490 | ||
491 | break; | |
492 | } | |
493 | ||
494 | /* We close the tty fd here since if the old session | |
495 | * ended our handle will be dead. It's important that | |
496 | * we do this after sleeping, so that we don't enter | |
497 | * an endless loop. */ | |
498 | fd = safe_close(fd); | |
499 | } | |
500 | ||
501 | safe_close(notify); | |
502 | ||
288a74cc RC |
503 | return fd; |
504 | ||
505 | fail: | |
506 | safe_close(fd); | |
507 | safe_close(notify); | |
508 | ||
509 | return r; | |
510 | } | |
511 | ||
512 | int release_terminal(void) { | |
513 | static const struct sigaction sa_new = { | |
514 | .sa_handler = SIG_IGN, | |
515 | .sa_flags = SA_RESTART, | |
516 | }; | |
517 | ||
518 | _cleanup_close_ int fd = -1; | |
519 | struct sigaction sa_old; | |
520 | int r = 0; | |
521 | ||
0a8b555c | 522 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
523 | if (fd < 0) |
524 | return -errno; | |
525 | ||
526 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
527 | * by our own TIOCNOTTY */ | |
528 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
529 | ||
530 | if (ioctl(fd, TIOCNOTTY) < 0) | |
531 | r = -errno; | |
532 | ||
533 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
534 | ||
535 | return r; | |
536 | } | |
537 | ||
538 | int terminal_vhangup_fd(int fd) { | |
539 | assert(fd >= 0); | |
540 | ||
541 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
542 | return -errno; | |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
547 | int terminal_vhangup(const char *name) { | |
548 | _cleanup_close_ int fd; | |
549 | ||
0a8b555c | 550 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
551 | if (fd < 0) |
552 | return fd; | |
553 | ||
554 | return terminal_vhangup_fd(fd); | |
555 | } | |
556 | ||
557 | int vt_disallocate(const char *name) { | |
1ba23931 | 558 | _cleanup_close_ int fd = -1; |
288a74cc | 559 | unsigned u; |
1ba23931 | 560 | int r; |
288a74cc RC |
561 | |
562 | /* Deallocate the VT if possible. If not possible | |
563 | * (i.e. because it is the active one), at least clear it | |
564 | * entirely (including the scrollback buffer) */ | |
565 | ||
566 | if (!startswith(name, "/dev/")) | |
567 | return -EINVAL; | |
568 | ||
569 | if (!tty_is_vc(name)) { | |
570 | /* So this is not a VT. I guess we cannot deallocate | |
571 | * it then. But let's at least clear the screen */ | |
572 | ||
573 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
574 | if (fd < 0) | |
575 | return fd; | |
576 | ||
577 | loop_write(fd, | |
578 | "\033[r" /* clear scrolling region */ | |
579 | "\033[H" /* move home */ | |
580 | "\033[2J", /* clear screen */ | |
581 | 10, false); | |
288a74cc RC |
582 | return 0; |
583 | } | |
584 | ||
585 | if (!startswith(name, "/dev/tty")) | |
586 | return -EINVAL; | |
587 | ||
588 | r = safe_atou(name+8, &u); | |
589 | if (r < 0) | |
590 | return r; | |
591 | ||
592 | if (u <= 0) | |
593 | return -EINVAL; | |
594 | ||
595 | /* Try to deallocate */ | |
0a8b555c | 596 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
597 | if (fd < 0) |
598 | return fd; | |
599 | ||
600 | r = ioctl(fd, VT_DISALLOCATE, u); | |
1ba23931 | 601 | fd = safe_close(fd); |
288a74cc RC |
602 | |
603 | if (r >= 0) | |
604 | return 0; | |
605 | ||
606 | if (errno != EBUSY) | |
607 | return -errno; | |
608 | ||
609 | /* Couldn't deallocate, so let's clear it fully with | |
610 | * scrollback */ | |
611 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
612 | if (fd < 0) | |
613 | return fd; | |
614 | ||
615 | loop_write(fd, | |
616 | "\033[r" /* clear scrolling region */ | |
617 | "\033[H" /* move home */ | |
618 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
619 | 10, false); | |
288a74cc RC |
620 | return 0; |
621 | } | |
622 | ||
288a74cc RC |
623 | int make_console_stdio(void) { |
624 | int fd, r; | |
625 | ||
626 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr */ | |
627 | ||
628 | fd = acquire_terminal("/dev/console", false, true, true, USEC_INFINITY); | |
629 | if (fd < 0) | |
630 | return log_error_errno(fd, "Failed to acquire terminal: %m"); | |
631 | ||
3d18b167 LP |
632 | r = reset_terminal_fd(fd, true); |
633 | if (r < 0) | |
634 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
635 | ||
288a74cc RC |
636 | r = make_stdio(fd); |
637 | if (r < 0) | |
638 | return log_error_errno(r, "Failed to duplicate terminal fd: %m"); | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
288a74cc RC |
643 | bool tty_is_vc(const char *tty) { |
644 | assert(tty); | |
645 | ||
646 | return vtnr_from_tty(tty) >= 0; | |
647 | } | |
648 | ||
649 | bool tty_is_console(const char *tty) { | |
650 | assert(tty); | |
651 | ||
652 | if (startswith(tty, "/dev/")) | |
653 | tty += 5; | |
654 | ||
655 | return streq(tty, "console"); | |
656 | } | |
657 | ||
658 | int vtnr_from_tty(const char *tty) { | |
659 | int i, r; | |
660 | ||
661 | assert(tty); | |
662 | ||
663 | if (startswith(tty, "/dev/")) | |
664 | tty += 5; | |
665 | ||
666 | if (!startswith(tty, "tty") ) | |
667 | return -EINVAL; | |
668 | ||
669 | if (tty[3] < '0' || tty[3] > '9') | |
670 | return -EINVAL; | |
671 | ||
672 | r = safe_atoi(tty+3, &i); | |
673 | if (r < 0) | |
674 | return r; | |
675 | ||
676 | if (i < 0 || i > 63) | |
677 | return -EINVAL; | |
678 | ||
679 | return i; | |
680 | } | |
681 | ||
682 | char *resolve_dev_console(char **active) { | |
683 | char *tty; | |
684 | ||
685 | /* Resolve where /dev/console is pointing to, if /sys is actually ours | |
686 | * (i.e. not read-only-mounted which is a sign for container setups) */ | |
687 | ||
688 | if (path_is_read_only_fs("/sys") > 0) | |
689 | return NULL; | |
690 | ||
691 | if (read_one_line_file("/sys/class/tty/console/active", active) < 0) | |
692 | return NULL; | |
693 | ||
694 | /* If multiple log outputs are configured the last one is what | |
695 | * /dev/console points to */ | |
696 | tty = strrchr(*active, ' '); | |
697 | if (tty) | |
698 | tty++; | |
699 | else | |
700 | tty = *active; | |
701 | ||
702 | if (streq(tty, "tty0")) { | |
703 | char *tmp; | |
704 | ||
705 | /* Get the active VC (e.g. tty1) */ | |
706 | if (read_one_line_file("/sys/class/tty/tty0/active", &tmp) >= 0) { | |
707 | free(*active); | |
708 | tty = *active = tmp; | |
709 | } | |
710 | } | |
711 | ||
712 | return tty; | |
713 | } | |
714 | ||
6af62124 WF |
715 | int get_kernel_consoles(char ***consoles) { |
716 | _cleanup_strv_free_ char **con = NULL; | |
717 | _cleanup_free_ char *line = NULL; | |
718 | const char *active; | |
719 | int r; | |
720 | ||
721 | assert(consoles); | |
722 | ||
723 | r = read_one_line_file("/sys/class/tty/console/active", &line); | |
724 | if (r < 0) | |
725 | return r; | |
726 | ||
727 | active = line; | |
728 | for (;;) { | |
729 | _cleanup_free_ char *tty = NULL; | |
730 | char *path; | |
731 | ||
732 | r = extract_first_word(&active, &tty, NULL, 0); | |
733 | if (r < 0) | |
734 | return r; | |
735 | if (r == 0) | |
736 | break; | |
737 | ||
738 | if (streq(tty, "tty0")) { | |
739 | tty = mfree(tty); | |
740 | r = read_one_line_file("/sys/class/tty/tty0/active", &tty); | |
741 | if (r < 0) | |
742 | return r; | |
743 | } | |
744 | ||
745 | path = strappend("/dev/", tty); | |
746 | if (!path) | |
747 | return -ENOMEM; | |
748 | ||
749 | if (access(path, F_OK) < 0) { | |
750 | log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path); | |
751 | free(path); | |
752 | continue; | |
753 | } | |
754 | ||
755 | r = strv_consume(&con, path); | |
756 | if (r < 0) | |
757 | return r; | |
758 | } | |
759 | ||
760 | if (strv_isempty(con)) { | |
761 | log_debug("No devices found for system console"); | |
762 | ||
763 | r = strv_extend(&con, "/dev/console"); | |
764 | if (r < 0) | |
765 | return r; | |
766 | } | |
767 | ||
768 | *consoles = con; | |
769 | con = NULL; | |
770 | return 0; | |
771 | } | |
772 | ||
288a74cc RC |
773 | bool tty_is_vc_resolve(const char *tty) { |
774 | _cleanup_free_ char *active = NULL; | |
775 | ||
776 | assert(tty); | |
777 | ||
778 | if (startswith(tty, "/dev/")) | |
779 | tty += 5; | |
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) { | |
6af760f3 | 791 | return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220"; |
288a74cc RC |
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. */ | |
913f38e4 | 894 | stdio_unset_cloexec(); |
288a74cc RC |
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) { | |
921 | const char *p; | |
922 | char *c; | |
923 | ||
924 | p = startswith(path, "/dev/"); | |
925 | c = strdup(p ?: path); | |
926 | if (!c) | |
927 | return -ENOMEM; | |
928 | ||
929 | *ret = c; | |
930 | return 0; | |
931 | } | |
932 | ||
933 | if (r != ERANGE) | |
934 | return -r; | |
935 | ||
936 | l *= 2; | |
937 | } | |
938 | ||
939 | return 0; | |
940 | } | |
941 | ||
942 | int getttyname_harder(int fd, char **r) { | |
943 | int k; | |
944 | char *s = NULL; | |
945 | ||
946 | k = getttyname_malloc(fd, &s); | |
947 | if (k < 0) | |
948 | return k; | |
949 | ||
950 | if (streq(s, "tty")) { | |
951 | free(s); | |
952 | return get_ctty(0, NULL, r); | |
953 | } | |
954 | ||
955 | *r = s; | |
956 | return 0; | |
957 | } | |
958 | ||
959 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
960 | int r; | |
961 | _cleanup_free_ char *line = NULL; | |
962 | const char *p; | |
963 | unsigned long ttynr; | |
964 | ||
965 | assert(pid >= 0); | |
966 | ||
967 | p = procfs_file_alloca(pid, "stat"); | |
968 | r = read_one_line_file(p, &line); | |
969 | if (r < 0) | |
970 | return r; | |
971 | ||
972 | p = strrchr(line, ')'); | |
973 | if (!p) | |
974 | return -EIO; | |
975 | ||
976 | p++; | |
977 | ||
978 | if (sscanf(p, " " | |
979 | "%*c " /* state */ | |
980 | "%*d " /* ppid */ | |
981 | "%*d " /* pgrp */ | |
982 | "%*d " /* session */ | |
983 | "%lu ", /* ttynr */ | |
984 | &ttynr) != 1) | |
985 | return -EIO; | |
986 | ||
987 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
cfeaa44a | 988 | return -ENXIO; |
288a74cc RC |
989 | |
990 | if (d) | |
991 | *d = (dev_t) ttynr; | |
992 | ||
993 | return 0; | |
994 | } | |
995 | ||
996 | int get_ctty(pid_t pid, dev_t *_devnr, char **r) { | |
997 | char fn[sizeof("/dev/char/")-1 + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL; | |
998 | _cleanup_free_ char *s = NULL; | |
999 | const char *p; | |
1000 | dev_t devnr; | |
1001 | int k; | |
1002 | ||
1003 | assert(r); | |
1004 | ||
1005 | k = get_ctty_devnr(pid, &devnr); | |
1006 | if (k < 0) | |
1007 | return k; | |
1008 | ||
1009 | sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr)); | |
1010 | ||
1011 | k = readlink_malloc(fn, &s); | |
1012 | if (k < 0) { | |
1013 | ||
1014 | if (k != -ENOENT) | |
1015 | return k; | |
1016 | ||
1017 | /* This is an ugly hack */ | |
1018 | if (major(devnr) == 136) { | |
1019 | if (asprintf(&b, "pts/%u", minor(devnr)) < 0) | |
1020 | return -ENOMEM; | |
1021 | } else { | |
1022 | /* Probably something like the ptys which have no | |
1023 | * symlink in /dev/char. Let's return something | |
1024 | * vaguely useful. */ | |
1025 | ||
1026 | b = strdup(fn + 5); | |
1027 | if (!b) | |
1028 | return -ENOMEM; | |
1029 | } | |
1030 | } else { | |
1031 | if (startswith(s, "/dev/")) | |
1032 | p = s + 5; | |
1033 | else if (startswith(s, "../")) | |
1034 | p = s + 3; | |
1035 | else | |
1036 | p = s; | |
1037 | ||
1038 | b = strdup(p); | |
1039 | if (!b) | |
1040 | return -ENOMEM; | |
1041 | } | |
1042 | ||
1043 | *r = b; | |
1044 | if (_devnr) | |
1045 | *_devnr = devnr; | |
1046 | ||
1047 | return 0; | |
1048 | } | |
a07c35c3 | 1049 | |
66cb2fde LP |
1050 | int ptsname_malloc(int fd, char **ret) { |
1051 | size_t l = 100; | |
1052 | ||
1053 | assert(fd >= 0); | |
1054 | assert(ret); | |
1055 | ||
1056 | for (;;) { | |
1057 | char *c; | |
1058 | ||
1059 | c = new(char, l); | |
1060 | if (!c) | |
1061 | return -ENOMEM; | |
1062 | ||
1063 | if (ptsname_r(fd, c, l) == 0) { | |
1064 | *ret = c; | |
1065 | return 0; | |
1066 | } | |
1067 | if (errno != ERANGE) { | |
1068 | free(c); | |
1069 | return -errno; | |
1070 | } | |
1071 | ||
1072 | free(c); | |
1073 | l *= 2; | |
1074 | } | |
1075 | } | |
1076 | ||
a07c35c3 LP |
1077 | int ptsname_namespace(int pty, char **ret) { |
1078 | int no = -1, r; | |
1079 | ||
1080 | /* Like ptsname(), but doesn't assume that the path is | |
1081 | * accessible in the local namespace. */ | |
1082 | ||
1083 | r = ioctl(pty, TIOCGPTN, &no); | |
1084 | if (r < 0) | |
1085 | return -errno; | |
1086 | ||
1087 | if (no < 0) | |
1088 | return -EIO; | |
1089 | ||
1090 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1091 | return -ENOMEM; | |
1092 | ||
1093 | return 0; | |
1094 | } | |
66cb2fde LP |
1095 | |
1096 | int openpt_in_namespace(pid_t pid, int flags) { | |
1097 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1098 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
1099 | siginfo_t si; | |
1100 | pid_t child; | |
1101 | int r; | |
1102 | ||
1103 | assert(pid > 0); | |
1104 | ||
1105 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1106 | if (r < 0) | |
1107 | return r; | |
1108 | ||
1109 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1110 | return -errno; | |
1111 | ||
1112 | child = fork(); | |
1113 | if (child < 0) | |
1114 | return -errno; | |
1115 | ||
1116 | if (child == 0) { | |
1117 | int master; | |
1118 | ||
1119 | pair[0] = safe_close(pair[0]); | |
1120 | ||
1121 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1122 | if (r < 0) | |
1123 | _exit(EXIT_FAILURE); | |
1124 | ||
1125 | master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); | |
1126 | if (master < 0) | |
1127 | _exit(EXIT_FAILURE); | |
1128 | ||
1129 | if (unlockpt(master) < 0) | |
1130 | _exit(EXIT_FAILURE); | |
1131 | ||
1132 | if (send_one_fd(pair[1], master, 0) < 0) | |
1133 | _exit(EXIT_FAILURE); | |
1134 | ||
1135 | _exit(EXIT_SUCCESS); | |
1136 | } | |
1137 | ||
1138 | pair[1] = safe_close(pair[1]); | |
1139 | ||
1140 | r = wait_for_terminate(child, &si); | |
1141 | if (r < 0) | |
1142 | return r; | |
1143 | if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS) | |
1144 | return -EIO; | |
1145 | ||
1146 | return receive_one_fd(pair[0], 0); | |
1147 | } | |
40e1f4ea LP |
1148 | |
1149 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
1150 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1151 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
1152 | siginfo_t si; | |
1153 | pid_t child; | |
1154 | int r; | |
1155 | ||
1156 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1157 | if (r < 0) | |
1158 | return r; | |
1159 | ||
1160 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1161 | return -errno; | |
1162 | ||
1163 | child = fork(); | |
1164 | if (child < 0) | |
1165 | return -errno; | |
1166 | ||
1167 | if (child == 0) { | |
1168 | int master; | |
1169 | ||
1170 | pair[0] = safe_close(pair[0]); | |
1171 | ||
1172 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1173 | if (r < 0) | |
1174 | _exit(EXIT_FAILURE); | |
1175 | ||
1176 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); | |
1177 | if (master < 0) | |
1178 | _exit(EXIT_FAILURE); | |
1179 | ||
1180 | if (send_one_fd(pair[1], master, 0) < 0) | |
1181 | _exit(EXIT_FAILURE); | |
1182 | ||
1183 | _exit(EXIT_SUCCESS); | |
1184 | } | |
1185 | ||
1186 | pair[1] = safe_close(pair[1]); | |
1187 | ||
1188 | r = wait_for_terminate(child, &si); | |
1189 | if (r < 0) | |
1190 | return r; | |
1191 | if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS) | |
1192 | return -EIO; | |
1193 | ||
1194 | return receive_one_fd(pair[0], 0); | |
1195 | } | |
40c9fe4c | 1196 | |
158fbf76 | 1197 | static bool getenv_terminal_is_dumb(void) { |
ac96418b LP |
1198 | const char *e; |
1199 | ||
ac96418b LP |
1200 | e = getenv("TERM"); |
1201 | if (!e) | |
1202 | return true; | |
1203 | ||
1204 | return streq(e, "dumb"); | |
1205 | } | |
1206 | ||
158fbf76 ZJS |
1207 | bool terminal_is_dumb(void) { |
1208 | if (!on_tty()) | |
1209 | return true; | |
1210 | ||
1211 | return getenv_terminal_is_dumb(); | |
1212 | } | |
1213 | ||
40c9fe4c | 1214 | bool colors_enabled(void) { |
ae5b3958 | 1215 | static int enabled = -1; |
40c9fe4c | 1216 | |
ae5b3958 | 1217 | if (_unlikely_(enabled < 0)) { |
acf553b0 | 1218 | int val; |
ae5b3958 | 1219 | |
acf553b0 ZJS |
1220 | val = getenv_bool("SYSTEMD_COLORS"); |
1221 | if (val >= 0) | |
1222 | enabled = val; | |
df0ff127 | 1223 | else if (getpid_cached() == 1) |
158fbf76 ZJS |
1224 | /* PID1 outputs to the console without holding it open all the time */ |
1225 | enabled = !getenv_terminal_is_dumb(); | |
ae5b3958 | 1226 | else |
ac96418b | 1227 | enabled = !terminal_is_dumb(); |
40c9fe4c JS |
1228 | } |
1229 | ||
ae5b3958 | 1230 | return enabled; |
40c9fe4c | 1231 | } |