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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 | 35 | #include "fileio.h" |
c004493c | 36 | #include "io-util.h" |
6bedfcbb | 37 | #include "parse-util.h" |
288a74cc | 38 | #include "path-util.h" |
07630cea | 39 | #include "process-util.h" |
2583fbea | 40 | #include "socket-util.h" |
07630cea | 41 | #include "string-util.h" |
3ffd4af2 | 42 | #include "terminal-util.h" |
07630cea LP |
43 | #include "time-util.h" |
44 | #include "util.h" | |
288a74cc RC |
45 | |
46 | static volatile unsigned cached_columns = 0; | |
47 | static volatile unsigned cached_lines = 0; | |
48 | ||
49 | int chvt(int vt) { | |
50 | _cleanup_close_ int fd; | |
51 | ||
0a8b555c | 52 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
53 | if (fd < 0) |
54 | return -errno; | |
55 | ||
b9e74c39 | 56 | if (vt <= 0) { |
288a74cc RC |
57 | int tiocl[2] = { |
58 | TIOCL_GETKMSGREDIRECT, | |
59 | 0 | |
60 | }; | |
61 | ||
62 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
63 | return -errno; | |
64 | ||
65 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
66 | } | |
67 | ||
68 | if (ioctl(fd, VT_ACTIVATE, vt) < 0) | |
69 | return -errno; | |
70 | ||
71 | return 0; | |
72 | } | |
73 | ||
74 | int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { | |
75 | struct termios old_termios, new_termios; | |
76 | char c, line[LINE_MAX]; | |
77 | ||
78 | assert(f); | |
79 | assert(ret); | |
80 | ||
81 | if (tcgetattr(fileno(f), &old_termios) >= 0) { | |
82 | new_termios = old_termios; | |
83 | ||
84 | new_termios.c_lflag &= ~ICANON; | |
85 | new_termios.c_cc[VMIN] = 1; | |
86 | new_termios.c_cc[VTIME] = 0; | |
87 | ||
88 | if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) { | |
89 | size_t k; | |
90 | ||
91 | if (t != USEC_INFINITY) { | |
92 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) { | |
93 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
94 | return -ETIMEDOUT; | |
95 | } | |
96 | } | |
97 | ||
98 | k = fread(&c, 1, 1, f); | |
99 | ||
100 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
101 | ||
102 | if (k <= 0) | |
103 | return -EIO; | |
104 | ||
105 | if (need_nl) | |
106 | *need_nl = c != '\n'; | |
107 | ||
108 | *ret = c; | |
109 | return 0; | |
110 | } | |
111 | } | |
112 | ||
113 | if (t != USEC_INFINITY) { | |
114 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) | |
115 | return -ETIMEDOUT; | |
116 | } | |
117 | ||
118 | errno = 0; | |
119 | if (!fgets(line, sizeof(line), f)) | |
120 | return errno ? -errno : -EIO; | |
121 | ||
122 | truncate_nl(line); | |
123 | ||
124 | if (strlen(line) != 1) | |
125 | return -EBADMSG; | |
126 | ||
127 | if (need_nl) | |
128 | *need_nl = false; | |
129 | ||
130 | *ret = line[0]; | |
131 | return 0; | |
132 | } | |
133 | ||
134 | int ask_char(char *ret, const char *replies, const char *text, ...) { | |
135 | int r; | |
136 | ||
137 | assert(ret); | |
138 | assert(replies); | |
139 | assert(text); | |
140 | ||
141 | for (;;) { | |
142 | va_list ap; | |
143 | char c; | |
144 | bool need_nl = true; | |
145 | ||
146 | if (on_tty()) | |
1fc464f6 | 147 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc RC |
148 | |
149 | va_start(ap, text); | |
150 | vprintf(text, ap); | |
151 | va_end(ap); | |
152 | ||
153 | if (on_tty()) | |
1fc464f6 | 154 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
155 | |
156 | fflush(stdout); | |
157 | ||
158 | r = read_one_char(stdin, &c, USEC_INFINITY, &need_nl); | |
159 | if (r < 0) { | |
160 | ||
161 | if (r == -EBADMSG) { | |
162 | puts("Bad input, please try again."); | |
163 | continue; | |
164 | } | |
165 | ||
166 | putchar('\n'); | |
167 | return r; | |
168 | } | |
169 | ||
170 | if (need_nl) | |
171 | putchar('\n'); | |
172 | ||
173 | if (strchr(replies, c)) { | |
174 | *ret = c; | |
175 | return 0; | |
176 | } | |
177 | ||
178 | puts("Read unexpected character, please try again."); | |
179 | } | |
180 | } | |
181 | ||
182 | int ask_string(char **ret, const char *text, ...) { | |
183 | assert(ret); | |
184 | assert(text); | |
185 | ||
186 | for (;;) { | |
187 | char line[LINE_MAX]; | |
188 | va_list ap; | |
189 | ||
190 | if (on_tty()) | |
1fc464f6 | 191 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc RC |
192 | |
193 | va_start(ap, text); | |
194 | vprintf(text, ap); | |
195 | va_end(ap); | |
196 | ||
197 | if (on_tty()) | |
1fc464f6 | 198 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
199 | |
200 | fflush(stdout); | |
201 | ||
202 | errno = 0; | |
203 | if (!fgets(line, sizeof(line), stdin)) | |
204 | return errno ? -errno : -EIO; | |
205 | ||
206 | if (!endswith(line, "\n")) | |
207 | putchar('\n'); | |
208 | else { | |
209 | char *s; | |
210 | ||
211 | if (isempty(line)) | |
212 | continue; | |
213 | ||
214 | truncate_nl(line); | |
215 | s = strdup(line); | |
216 | if (!s) | |
217 | return -ENOMEM; | |
218 | ||
219 | *ret = s; | |
220 | return 0; | |
221 | } | |
222 | } | |
223 | } | |
224 | ||
225 | int reset_terminal_fd(int fd, bool switch_to_text) { | |
226 | struct termios termios; | |
227 | int r = 0; | |
228 | ||
229 | /* Set terminal to some sane defaults */ | |
230 | ||
231 | assert(fd >= 0); | |
232 | ||
233 | /* We leave locked terminal attributes untouched, so that | |
234 | * Plymouth may set whatever it wants to set, and we don't | |
235 | * interfere with that. */ | |
236 | ||
237 | /* Disable exclusive mode, just in case */ | |
7d927c9a | 238 | (void) ioctl(fd, TIOCNXCL); |
288a74cc RC |
239 | |
240 | /* Switch to text mode */ | |
241 | if (switch_to_text) | |
7d927c9a | 242 | (void) ioctl(fd, KDSETMODE, KD_TEXT); |
288a74cc RC |
243 | |
244 | /* Enable console unicode mode */ | |
7d927c9a | 245 | (void) ioctl(fd, KDSKBMODE, K_UNICODE); |
288a74cc RC |
246 | |
247 | if (tcgetattr(fd, &termios) < 0) { | |
248 | r = -errno; | |
249 | goto finish; | |
250 | } | |
251 | ||
252 | /* We only reset the stuff that matters to the software. How | |
253 | * hardware is set up we don't touch assuming that somebody | |
254 | * else will do that for us */ | |
255 | ||
256 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
257 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
258 | termios.c_oflag |= ONLCR; | |
259 | termios.c_cflag |= CREAD; | |
260 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
261 | ||
262 | termios.c_cc[VINTR] = 03; /* ^C */ | |
263 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
264 | termios.c_cc[VERASE] = 0177; | |
265 | termios.c_cc[VKILL] = 025; /* ^X */ | |
266 | termios.c_cc[VEOF] = 04; /* ^D */ | |
267 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
268 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
269 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
270 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
271 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
272 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
273 | termios.c_cc[VEOL] = 0; | |
274 | termios.c_cc[VEOL2] = 0; | |
275 | ||
276 | termios.c_cc[VTIME] = 0; | |
277 | termios.c_cc[VMIN] = 1; | |
278 | ||
279 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
280 | r = -errno; | |
281 | ||
282 | finish: | |
283 | /* Just in case, flush all crap out */ | |
7d927c9a | 284 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
285 | |
286 | return r; | |
287 | } | |
288 | ||
289 | int reset_terminal(const char *name) { | |
290 | _cleanup_close_ int fd = -1; | |
291 | ||
0a8b555c LP |
292 | /* We open the terminal with O_NONBLOCK here, to ensure we |
293 | * don't block on carrier if this is a terminal with carrier | |
294 | * configured. */ | |
295 | ||
296 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
297 | if (fd < 0) |
298 | return fd; | |
299 | ||
300 | return reset_terminal_fd(fd, true); | |
301 | } | |
302 | ||
303 | int open_terminal(const char *name, int mode) { | |
304 | int fd, r; | |
305 | unsigned c = 0; | |
306 | ||
307 | /* | |
308 | * If a TTY is in the process of being closed opening it might | |
309 | * cause EIO. This is horribly awful, but unlikely to be | |
310 | * changed in the kernel. Hence we work around this problem by | |
311 | * retrying a couple of times. | |
312 | * | |
313 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
314 | */ | |
315 | ||
35bdab77 LP |
316 | if (mode & O_CREAT) |
317 | return -EINVAL; | |
288a74cc RC |
318 | |
319 | for (;;) { | |
320 | fd = open(name, mode, 0); | |
321 | if (fd >= 0) | |
322 | break; | |
323 | ||
324 | if (errno != EIO) | |
325 | return -errno; | |
326 | ||
327 | /* Max 1s in total */ | |
328 | if (c >= 20) | |
329 | return -errno; | |
330 | ||
331 | usleep(50 * USEC_PER_MSEC); | |
332 | c++; | |
333 | } | |
334 | ||
335 | r = isatty(fd); | |
336 | if (r < 0) { | |
337 | safe_close(fd); | |
338 | return -errno; | |
339 | } | |
340 | ||
341 | if (!r) { | |
342 | safe_close(fd); | |
343 | return -ENOTTY; | |
344 | } | |
345 | ||
346 | return fd; | |
347 | } | |
348 | ||
349 | int acquire_terminal( | |
350 | const char *name, | |
351 | bool fail, | |
352 | bool force, | |
353 | bool ignore_tiocstty_eperm, | |
354 | usec_t timeout) { | |
355 | ||
356 | int fd = -1, notify = -1, r = 0, wd = -1; | |
357 | usec_t ts = 0; | |
358 | ||
359 | assert(name); | |
360 | ||
361 | /* We use inotify to be notified when the tty is closed. We | |
362 | * create the watch before checking if we can actually acquire | |
363 | * it, so that we don't lose any event. | |
364 | * | |
365 | * Note: strictly speaking this actually watches for the | |
366 | * device being closed, it does *not* really watch whether a | |
367 | * tty loses its controlling process. However, unless some | |
368 | * rogue process uses TIOCNOTTY on /dev/tty *after* closing | |
369 | * its tty otherwise this will not become a problem. As long | |
370 | * as the administrator makes sure not configure any service | |
371 | * on the same tty as an untrusted user this should not be a | |
372 | * problem. (Which he probably should not do anyway.) */ | |
373 | ||
374 | if (timeout != USEC_INFINITY) | |
375 | ts = now(CLOCK_MONOTONIC); | |
376 | ||
377 | if (!fail && !force) { | |
378 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); | |
379 | if (notify < 0) { | |
380 | r = -errno; | |
381 | goto fail; | |
382 | } | |
383 | ||
384 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
385 | if (wd < 0) { | |
386 | r = -errno; | |
387 | goto fail; | |
388 | } | |
389 | } | |
390 | ||
391 | for (;;) { | |
392 | struct sigaction sa_old, sa_new = { | |
393 | .sa_handler = SIG_IGN, | |
394 | .sa_flags = SA_RESTART, | |
395 | }; | |
396 | ||
397 | if (notify >= 0) { | |
398 | r = flush_fd(notify); | |
399 | if (r < 0) | |
400 | goto fail; | |
401 | } | |
402 | ||
403 | /* We pass here O_NOCTTY only so that we can check the return | |
404 | * value TIOCSCTTY and have a reliable way to figure out if we | |
405 | * successfully became the controlling process of the tty */ | |
406 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
407 | if (fd < 0) | |
408 | return fd; | |
409 | ||
410 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
411 | * if we already own the tty. */ | |
412 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
413 | ||
414 | /* First, try to get the tty */ | |
415 | if (ioctl(fd, TIOCSCTTY, force) < 0) | |
416 | r = -errno; | |
417 | ||
418 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
419 | ||
420 | /* Sometimes it makes sense to ignore TIOCSCTTY | |
421 | * returning EPERM, i.e. when very likely we already | |
422 | * are have this controlling terminal. */ | |
423 | if (r < 0 && r == -EPERM && ignore_tiocstty_eperm) | |
424 | r = 0; | |
425 | ||
7d927c9a | 426 | if (r < 0 && (force || fail || r != -EPERM)) |
288a74cc | 427 | goto fail; |
288a74cc RC |
428 | |
429 | if (r >= 0) | |
430 | break; | |
431 | ||
432 | assert(!fail); | |
433 | assert(!force); | |
434 | assert(notify >= 0); | |
435 | ||
436 | for (;;) { | |
437 | union inotify_event_buffer buffer; | |
438 | struct inotify_event *e; | |
439 | ssize_t l; | |
440 | ||
441 | if (timeout != USEC_INFINITY) { | |
442 | usec_t n; | |
443 | ||
444 | n = now(CLOCK_MONOTONIC); | |
445 | if (ts + timeout < n) { | |
446 | r = -ETIMEDOUT; | |
447 | goto fail; | |
448 | } | |
449 | ||
450 | r = fd_wait_for_event(fd, POLLIN, ts + timeout - n); | |
451 | if (r < 0) | |
452 | goto fail; | |
453 | ||
454 | if (r == 0) { | |
455 | r = -ETIMEDOUT; | |
456 | goto fail; | |
457 | } | |
458 | } | |
459 | ||
460 | l = read(notify, &buffer, sizeof(buffer)); | |
461 | if (l < 0) { | |
462 | if (errno == EINTR || errno == EAGAIN) | |
463 | continue; | |
464 | ||
465 | r = -errno; | |
466 | goto fail; | |
467 | } | |
468 | ||
469 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
470 | if (e->wd != wd || !(e->mask & IN_CLOSE)) { | |
471 | r = -EIO; | |
472 | goto fail; | |
473 | } | |
474 | } | |
475 | ||
476 | break; | |
477 | } | |
478 | ||
479 | /* We close the tty fd here since if the old session | |
480 | * ended our handle will be dead. It's important that | |
481 | * we do this after sleeping, so that we don't enter | |
482 | * an endless loop. */ | |
483 | fd = safe_close(fd); | |
484 | } | |
485 | ||
486 | safe_close(notify); | |
487 | ||
288a74cc RC |
488 | return fd; |
489 | ||
490 | fail: | |
491 | safe_close(fd); | |
492 | safe_close(notify); | |
493 | ||
494 | return r; | |
495 | } | |
496 | ||
497 | int release_terminal(void) { | |
498 | static const struct sigaction sa_new = { | |
499 | .sa_handler = SIG_IGN, | |
500 | .sa_flags = SA_RESTART, | |
501 | }; | |
502 | ||
503 | _cleanup_close_ int fd = -1; | |
504 | struct sigaction sa_old; | |
505 | int r = 0; | |
506 | ||
0a8b555c | 507 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
508 | if (fd < 0) |
509 | return -errno; | |
510 | ||
511 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
512 | * by our own TIOCNOTTY */ | |
513 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
514 | ||
515 | if (ioctl(fd, TIOCNOTTY) < 0) | |
516 | r = -errno; | |
517 | ||
518 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
519 | ||
520 | return r; | |
521 | } | |
522 | ||
523 | int terminal_vhangup_fd(int fd) { | |
524 | assert(fd >= 0); | |
525 | ||
526 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
527 | return -errno; | |
528 | ||
529 | return 0; | |
530 | } | |
531 | ||
532 | int terminal_vhangup(const char *name) { | |
533 | _cleanup_close_ int fd; | |
534 | ||
0a8b555c | 535 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
536 | if (fd < 0) |
537 | return fd; | |
538 | ||
539 | return terminal_vhangup_fd(fd); | |
540 | } | |
541 | ||
542 | int vt_disallocate(const char *name) { | |
1ba23931 | 543 | _cleanup_close_ int fd = -1; |
288a74cc | 544 | unsigned u; |
1ba23931 | 545 | int r; |
288a74cc RC |
546 | |
547 | /* Deallocate the VT if possible. If not possible | |
548 | * (i.e. because it is the active one), at least clear it | |
549 | * entirely (including the scrollback buffer) */ | |
550 | ||
551 | if (!startswith(name, "/dev/")) | |
552 | return -EINVAL; | |
553 | ||
554 | if (!tty_is_vc(name)) { | |
555 | /* So this is not a VT. I guess we cannot deallocate | |
556 | * it then. But let's at least clear the screen */ | |
557 | ||
558 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
559 | if (fd < 0) | |
560 | return fd; | |
561 | ||
562 | loop_write(fd, | |
563 | "\033[r" /* clear scrolling region */ | |
564 | "\033[H" /* move home */ | |
565 | "\033[2J", /* clear screen */ | |
566 | 10, false); | |
288a74cc RC |
567 | return 0; |
568 | } | |
569 | ||
570 | if (!startswith(name, "/dev/tty")) | |
571 | return -EINVAL; | |
572 | ||
573 | r = safe_atou(name+8, &u); | |
574 | if (r < 0) | |
575 | return r; | |
576 | ||
577 | if (u <= 0) | |
578 | return -EINVAL; | |
579 | ||
580 | /* Try to deallocate */ | |
0a8b555c | 581 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
582 | if (fd < 0) |
583 | return fd; | |
584 | ||
585 | r = ioctl(fd, VT_DISALLOCATE, u); | |
1ba23931 | 586 | fd = safe_close(fd); |
288a74cc RC |
587 | |
588 | if (r >= 0) | |
589 | return 0; | |
590 | ||
591 | if (errno != EBUSY) | |
592 | return -errno; | |
593 | ||
594 | /* Couldn't deallocate, so let's clear it fully with | |
595 | * scrollback */ | |
596 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
597 | if (fd < 0) | |
598 | return fd; | |
599 | ||
600 | loop_write(fd, | |
601 | "\033[r" /* clear scrolling region */ | |
602 | "\033[H" /* move home */ | |
603 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
604 | 10, false); | |
288a74cc RC |
605 | return 0; |
606 | } | |
607 | ||
288a74cc RC |
608 | int make_console_stdio(void) { |
609 | int fd, r; | |
610 | ||
611 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr */ | |
612 | ||
613 | fd = acquire_terminal("/dev/console", false, true, true, USEC_INFINITY); | |
614 | if (fd < 0) | |
615 | return log_error_errno(fd, "Failed to acquire terminal: %m"); | |
616 | ||
3d18b167 LP |
617 | r = reset_terminal_fd(fd, true); |
618 | if (r < 0) | |
619 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
620 | ||
288a74cc RC |
621 | r = make_stdio(fd); |
622 | if (r < 0) | |
623 | return log_error_errno(r, "Failed to duplicate terminal fd: %m"); | |
624 | ||
625 | return 0; | |
626 | } | |
627 | ||
628 | int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) { | |
629 | static const char status_indent[] = " "; /* "[" STATUS "] " */ | |
630 | _cleanup_free_ char *s = NULL; | |
631 | _cleanup_close_ int fd = -1; | |
632 | struct iovec iovec[6] = {}; | |
633 | int n = 0; | |
634 | static bool prev_ephemeral; | |
635 | ||
636 | assert(format); | |
637 | ||
638 | /* This is independent of logging, as status messages are | |
639 | * optional and go exclusively to the console. */ | |
640 | ||
641 | if (vasprintf(&s, format, ap) < 0) | |
642 | return log_oom(); | |
643 | ||
644 | fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); | |
645 | if (fd < 0) | |
646 | return fd; | |
647 | ||
648 | if (ellipse) { | |
649 | char *e; | |
650 | size_t emax, sl; | |
651 | int c; | |
652 | ||
653 | c = fd_columns(fd); | |
654 | if (c <= 0) | |
655 | c = 80; | |
656 | ||
657 | sl = status ? sizeof(status_indent)-1 : 0; | |
658 | ||
659 | emax = c - sl - 1; | |
660 | if (emax < 3) | |
661 | emax = 3; | |
662 | ||
663 | e = ellipsize(s, emax, 50); | |
664 | if (e) { | |
665 | free(s); | |
666 | s = e; | |
667 | } | |
668 | } | |
669 | ||
670 | if (prev_ephemeral) | |
671 | IOVEC_SET_STRING(iovec[n++], "\r" ANSI_ERASE_TO_END_OF_LINE); | |
672 | prev_ephemeral = ephemeral; | |
673 | ||
674 | if (status) { | |
675 | if (!isempty(status)) { | |
676 | IOVEC_SET_STRING(iovec[n++], "["); | |
677 | IOVEC_SET_STRING(iovec[n++], status); | |
678 | IOVEC_SET_STRING(iovec[n++], "] "); | |
679 | } else | |
680 | IOVEC_SET_STRING(iovec[n++], status_indent); | |
681 | } | |
682 | ||
683 | IOVEC_SET_STRING(iovec[n++], s); | |
684 | if (!ephemeral) | |
685 | IOVEC_SET_STRING(iovec[n++], "\n"); | |
686 | ||
687 | if (writev(fd, iovec, n) < 0) | |
688 | return -errno; | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
693 | int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) { | |
694 | va_list ap; | |
695 | int r; | |
696 | ||
697 | assert(format); | |
698 | ||
699 | va_start(ap, format); | |
700 | r = status_vprintf(status, ellipse, ephemeral, format, ap); | |
701 | va_end(ap); | |
702 | ||
703 | return r; | |
704 | } | |
705 | ||
706 | bool tty_is_vc(const char *tty) { | |
707 | assert(tty); | |
708 | ||
709 | return vtnr_from_tty(tty) >= 0; | |
710 | } | |
711 | ||
712 | bool tty_is_console(const char *tty) { | |
713 | assert(tty); | |
714 | ||
715 | if (startswith(tty, "/dev/")) | |
716 | tty += 5; | |
717 | ||
718 | return streq(tty, "console"); | |
719 | } | |
720 | ||
721 | int vtnr_from_tty(const char *tty) { | |
722 | int i, r; | |
723 | ||
724 | assert(tty); | |
725 | ||
726 | if (startswith(tty, "/dev/")) | |
727 | tty += 5; | |
728 | ||
729 | if (!startswith(tty, "tty") ) | |
730 | return -EINVAL; | |
731 | ||
732 | if (tty[3] < '0' || tty[3] > '9') | |
733 | return -EINVAL; | |
734 | ||
735 | r = safe_atoi(tty+3, &i); | |
736 | if (r < 0) | |
737 | return r; | |
738 | ||
739 | if (i < 0 || i > 63) | |
740 | return -EINVAL; | |
741 | ||
742 | return i; | |
743 | } | |
744 | ||
745 | char *resolve_dev_console(char **active) { | |
746 | char *tty; | |
747 | ||
748 | /* Resolve where /dev/console is pointing to, if /sys is actually ours | |
749 | * (i.e. not read-only-mounted which is a sign for container setups) */ | |
750 | ||
751 | if (path_is_read_only_fs("/sys") > 0) | |
752 | return NULL; | |
753 | ||
754 | if (read_one_line_file("/sys/class/tty/console/active", active) < 0) | |
755 | return NULL; | |
756 | ||
757 | /* If multiple log outputs are configured the last one is what | |
758 | * /dev/console points to */ | |
759 | tty = strrchr(*active, ' '); | |
760 | if (tty) | |
761 | tty++; | |
762 | else | |
763 | tty = *active; | |
764 | ||
765 | if (streq(tty, "tty0")) { | |
766 | char *tmp; | |
767 | ||
768 | /* Get the active VC (e.g. tty1) */ | |
769 | if (read_one_line_file("/sys/class/tty/tty0/active", &tmp) >= 0) { | |
770 | free(*active); | |
771 | tty = *active = tmp; | |
772 | } | |
773 | } | |
774 | ||
775 | return tty; | |
776 | } | |
777 | ||
778 | bool tty_is_vc_resolve(const char *tty) { | |
779 | _cleanup_free_ char *active = NULL; | |
780 | ||
781 | assert(tty); | |
782 | ||
783 | if (startswith(tty, "/dev/")) | |
784 | tty += 5; | |
785 | ||
786 | if (streq(tty, "console")) { | |
787 | tty = resolve_dev_console(&active); | |
788 | if (!tty) | |
789 | return false; | |
790 | } | |
791 | ||
792 | return tty_is_vc(tty); | |
793 | } | |
794 | ||
795 | const char *default_term_for_tty(const char *tty) { | |
796 | assert(tty); | |
797 | ||
798 | return tty_is_vc_resolve(tty) ? "TERM=linux" : "TERM=vt220"; | |
799 | } | |
800 | ||
801 | int fd_columns(int fd) { | |
802 | struct winsize ws = {}; | |
803 | ||
804 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
805 | return -errno; | |
806 | ||
807 | if (ws.ws_col <= 0) | |
808 | return -EIO; | |
809 | ||
810 | return ws.ws_col; | |
811 | } | |
812 | ||
813 | unsigned columns(void) { | |
814 | const char *e; | |
815 | int c; | |
816 | ||
817 | if (_likely_(cached_columns > 0)) | |
818 | return cached_columns; | |
819 | ||
820 | c = 0; | |
821 | e = getenv("COLUMNS"); | |
822 | if (e) | |
823 | (void) safe_atoi(e, &c); | |
824 | ||
825 | if (c <= 0) | |
826 | c = fd_columns(STDOUT_FILENO); | |
827 | ||
828 | if (c <= 0) | |
829 | c = 80; | |
830 | ||
831 | cached_columns = c; | |
832 | return cached_columns; | |
833 | } | |
834 | ||
835 | int fd_lines(int fd) { | |
836 | struct winsize ws = {}; | |
837 | ||
838 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
839 | return -errno; | |
840 | ||
841 | if (ws.ws_row <= 0) | |
842 | return -EIO; | |
843 | ||
844 | return ws.ws_row; | |
845 | } | |
846 | ||
847 | unsigned lines(void) { | |
848 | const char *e; | |
849 | int l; | |
850 | ||
851 | if (_likely_(cached_lines > 0)) | |
852 | return cached_lines; | |
853 | ||
854 | l = 0; | |
855 | e = getenv("LINES"); | |
856 | if (e) | |
857 | (void) safe_atoi(e, &l); | |
858 | ||
859 | if (l <= 0) | |
860 | l = fd_lines(STDOUT_FILENO); | |
861 | ||
862 | if (l <= 0) | |
863 | l = 24; | |
864 | ||
865 | cached_lines = l; | |
866 | return cached_lines; | |
867 | } | |
868 | ||
869 | /* intended to be used as a SIGWINCH sighandler */ | |
870 | void columns_lines_cache_reset(int signum) { | |
871 | cached_columns = 0; | |
872 | cached_lines = 0; | |
873 | } | |
874 | ||
875 | bool on_tty(void) { | |
876 | static int cached_on_tty = -1; | |
877 | ||
878 | if (_unlikely_(cached_on_tty < 0)) | |
879 | cached_on_tty = isatty(STDOUT_FILENO) > 0; | |
880 | ||
881 | return cached_on_tty; | |
882 | } | |
883 | ||
884 | int make_stdio(int fd) { | |
885 | int r, s, t; | |
886 | ||
887 | assert(fd >= 0); | |
888 | ||
889 | r = dup2(fd, STDIN_FILENO); | |
890 | s = dup2(fd, STDOUT_FILENO); | |
891 | t = dup2(fd, STDERR_FILENO); | |
892 | ||
893 | if (fd >= 3) | |
894 | safe_close(fd); | |
895 | ||
896 | if (r < 0 || s < 0 || t < 0) | |
897 | return -errno; | |
898 | ||
899 | /* Explicitly unset O_CLOEXEC, since if fd was < 3, then | |
900 | * dup2() was a NOP and the bit hence possibly set. */ | |
901 | fd_cloexec(STDIN_FILENO, false); | |
902 | fd_cloexec(STDOUT_FILENO, false); | |
903 | fd_cloexec(STDERR_FILENO, false); | |
904 | ||
905 | return 0; | |
906 | } | |
907 | ||
908 | int make_null_stdio(void) { | |
909 | int null_fd; | |
910 | ||
911 | null_fd = open("/dev/null", O_RDWR|O_NOCTTY); | |
912 | if (null_fd < 0) | |
913 | return -errno; | |
914 | ||
915 | return make_stdio(null_fd); | |
916 | } | |
917 | ||
918 | int getttyname_malloc(int fd, char **ret) { | |
919 | size_t l = 100; | |
920 | int r; | |
921 | ||
922 | assert(fd >= 0); | |
923 | assert(ret); | |
924 | ||
925 | for (;;) { | |
926 | char path[l]; | |
927 | ||
928 | r = ttyname_r(fd, path, sizeof(path)); | |
929 | if (r == 0) { | |
930 | const char *p; | |
931 | char *c; | |
932 | ||
933 | p = startswith(path, "/dev/"); | |
934 | c = strdup(p ?: path); | |
935 | if (!c) | |
936 | return -ENOMEM; | |
937 | ||
938 | *ret = c; | |
939 | return 0; | |
940 | } | |
941 | ||
942 | if (r != ERANGE) | |
943 | return -r; | |
944 | ||
945 | l *= 2; | |
946 | } | |
947 | ||
948 | return 0; | |
949 | } | |
950 | ||
951 | int getttyname_harder(int fd, char **r) { | |
952 | int k; | |
953 | char *s = NULL; | |
954 | ||
955 | k = getttyname_malloc(fd, &s); | |
956 | if (k < 0) | |
957 | return k; | |
958 | ||
959 | if (streq(s, "tty")) { | |
960 | free(s); | |
961 | return get_ctty(0, NULL, r); | |
962 | } | |
963 | ||
964 | *r = s; | |
965 | return 0; | |
966 | } | |
967 | ||
968 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
969 | int r; | |
970 | _cleanup_free_ char *line = NULL; | |
971 | const char *p; | |
972 | unsigned long ttynr; | |
973 | ||
974 | assert(pid >= 0); | |
975 | ||
976 | p = procfs_file_alloca(pid, "stat"); | |
977 | r = read_one_line_file(p, &line); | |
978 | if (r < 0) | |
979 | return r; | |
980 | ||
981 | p = strrchr(line, ')'); | |
982 | if (!p) | |
983 | return -EIO; | |
984 | ||
985 | p++; | |
986 | ||
987 | if (sscanf(p, " " | |
988 | "%*c " /* state */ | |
989 | "%*d " /* ppid */ | |
990 | "%*d " /* pgrp */ | |
991 | "%*d " /* session */ | |
992 | "%lu ", /* ttynr */ | |
993 | &ttynr) != 1) | |
994 | return -EIO; | |
995 | ||
996 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
cfeaa44a | 997 | return -ENXIO; |
288a74cc RC |
998 | |
999 | if (d) | |
1000 | *d = (dev_t) ttynr; | |
1001 | ||
1002 | return 0; | |
1003 | } | |
1004 | ||
1005 | int get_ctty(pid_t pid, dev_t *_devnr, char **r) { | |
1006 | char fn[sizeof("/dev/char/")-1 + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL; | |
1007 | _cleanup_free_ char *s = NULL; | |
1008 | const char *p; | |
1009 | dev_t devnr; | |
1010 | int k; | |
1011 | ||
1012 | assert(r); | |
1013 | ||
1014 | k = get_ctty_devnr(pid, &devnr); | |
1015 | if (k < 0) | |
1016 | return k; | |
1017 | ||
1018 | sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr)); | |
1019 | ||
1020 | k = readlink_malloc(fn, &s); | |
1021 | if (k < 0) { | |
1022 | ||
1023 | if (k != -ENOENT) | |
1024 | return k; | |
1025 | ||
1026 | /* This is an ugly hack */ | |
1027 | if (major(devnr) == 136) { | |
1028 | if (asprintf(&b, "pts/%u", minor(devnr)) < 0) | |
1029 | return -ENOMEM; | |
1030 | } else { | |
1031 | /* Probably something like the ptys which have no | |
1032 | * symlink in /dev/char. Let's return something | |
1033 | * vaguely useful. */ | |
1034 | ||
1035 | b = strdup(fn + 5); | |
1036 | if (!b) | |
1037 | return -ENOMEM; | |
1038 | } | |
1039 | } else { | |
1040 | if (startswith(s, "/dev/")) | |
1041 | p = s + 5; | |
1042 | else if (startswith(s, "../")) | |
1043 | p = s + 3; | |
1044 | else | |
1045 | p = s; | |
1046 | ||
1047 | b = strdup(p); | |
1048 | if (!b) | |
1049 | return -ENOMEM; | |
1050 | } | |
1051 | ||
1052 | *r = b; | |
1053 | if (_devnr) | |
1054 | *_devnr = devnr; | |
1055 | ||
1056 | return 0; | |
1057 | } | |
a07c35c3 | 1058 | |
66cb2fde LP |
1059 | int ptsname_malloc(int fd, char **ret) { |
1060 | size_t l = 100; | |
1061 | ||
1062 | assert(fd >= 0); | |
1063 | assert(ret); | |
1064 | ||
1065 | for (;;) { | |
1066 | char *c; | |
1067 | ||
1068 | c = new(char, l); | |
1069 | if (!c) | |
1070 | return -ENOMEM; | |
1071 | ||
1072 | if (ptsname_r(fd, c, l) == 0) { | |
1073 | *ret = c; | |
1074 | return 0; | |
1075 | } | |
1076 | if (errno != ERANGE) { | |
1077 | free(c); | |
1078 | return -errno; | |
1079 | } | |
1080 | ||
1081 | free(c); | |
1082 | l *= 2; | |
1083 | } | |
1084 | } | |
1085 | ||
a07c35c3 LP |
1086 | int ptsname_namespace(int pty, char **ret) { |
1087 | int no = -1, r; | |
1088 | ||
1089 | /* Like ptsname(), but doesn't assume that the path is | |
1090 | * accessible in the local namespace. */ | |
1091 | ||
1092 | r = ioctl(pty, TIOCGPTN, &no); | |
1093 | if (r < 0) | |
1094 | return -errno; | |
1095 | ||
1096 | if (no < 0) | |
1097 | return -EIO; | |
1098 | ||
1099 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1100 | return -ENOMEM; | |
1101 | ||
1102 | return 0; | |
1103 | } | |
66cb2fde LP |
1104 | |
1105 | int openpt_in_namespace(pid_t pid, int flags) { | |
1106 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1107 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
1108 | siginfo_t si; | |
1109 | pid_t child; | |
1110 | int r; | |
1111 | ||
1112 | assert(pid > 0); | |
1113 | ||
1114 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1115 | if (r < 0) | |
1116 | return r; | |
1117 | ||
1118 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1119 | return -errno; | |
1120 | ||
1121 | child = fork(); | |
1122 | if (child < 0) | |
1123 | return -errno; | |
1124 | ||
1125 | if (child == 0) { | |
1126 | int master; | |
1127 | ||
1128 | pair[0] = safe_close(pair[0]); | |
1129 | ||
1130 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1131 | if (r < 0) | |
1132 | _exit(EXIT_FAILURE); | |
1133 | ||
1134 | master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); | |
1135 | if (master < 0) | |
1136 | _exit(EXIT_FAILURE); | |
1137 | ||
1138 | if (unlockpt(master) < 0) | |
1139 | _exit(EXIT_FAILURE); | |
1140 | ||
1141 | if (send_one_fd(pair[1], master, 0) < 0) | |
1142 | _exit(EXIT_FAILURE); | |
1143 | ||
1144 | _exit(EXIT_SUCCESS); | |
1145 | } | |
1146 | ||
1147 | pair[1] = safe_close(pair[1]); | |
1148 | ||
1149 | r = wait_for_terminate(child, &si); | |
1150 | if (r < 0) | |
1151 | return r; | |
1152 | if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS) | |
1153 | return -EIO; | |
1154 | ||
1155 | return receive_one_fd(pair[0], 0); | |
1156 | } | |
40e1f4ea LP |
1157 | |
1158 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
1159 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1160 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
1161 | siginfo_t si; | |
1162 | pid_t child; | |
1163 | int r; | |
1164 | ||
1165 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1166 | if (r < 0) | |
1167 | return r; | |
1168 | ||
1169 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1170 | return -errno; | |
1171 | ||
1172 | child = fork(); | |
1173 | if (child < 0) | |
1174 | return -errno; | |
1175 | ||
1176 | if (child == 0) { | |
1177 | int master; | |
1178 | ||
1179 | pair[0] = safe_close(pair[0]); | |
1180 | ||
1181 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1182 | if (r < 0) | |
1183 | _exit(EXIT_FAILURE); | |
1184 | ||
1185 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); | |
1186 | if (master < 0) | |
1187 | _exit(EXIT_FAILURE); | |
1188 | ||
1189 | if (send_one_fd(pair[1], master, 0) < 0) | |
1190 | _exit(EXIT_FAILURE); | |
1191 | ||
1192 | _exit(EXIT_SUCCESS); | |
1193 | } | |
1194 | ||
1195 | pair[1] = safe_close(pair[1]); | |
1196 | ||
1197 | r = wait_for_terminate(child, &si); | |
1198 | if (r < 0) | |
1199 | return r; | |
1200 | if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS) | |
1201 | return -EIO; | |
1202 | ||
1203 | return receive_one_fd(pair[0], 0); | |
1204 | } |