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