]>
Commit | Line | Data |
---|---|---|
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" |
f4f15635 | 36 | #include "fs-util.h" |
c004493c | 37 | #include "io-util.h" |
6bedfcbb | 38 | #include "parse-util.h" |
288a74cc | 39 | #include "path-util.h" |
07630cea | 40 | #include "process-util.h" |
2583fbea | 41 | #include "socket-util.h" |
07630cea | 42 | #include "string-util.h" |
3ffd4af2 | 43 | #include "terminal-util.h" |
07630cea LP |
44 | #include "time-util.h" |
45 | #include "util.h" | |
288a74cc RC |
46 | |
47 | static volatile unsigned cached_columns = 0; | |
48 | static volatile unsigned cached_lines = 0; | |
49 | ||
50 | int chvt(int vt) { | |
51 | _cleanup_close_ int fd; | |
52 | ||
0a8b555c | 53 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
54 | if (fd < 0) |
55 | return -errno; | |
56 | ||
b9e74c39 | 57 | if (vt <= 0) { |
288a74cc RC |
58 | int tiocl[2] = { |
59 | TIOCL_GETKMSGREDIRECT, | |
60 | 0 | |
61 | }; | |
62 | ||
63 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
64 | return -errno; | |
65 | ||
66 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
67 | } | |
68 | ||
69 | if (ioctl(fd, VT_ACTIVATE, vt) < 0) | |
70 | return -errno; | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { | |
76 | struct termios old_termios, new_termios; | |
77 | char c, line[LINE_MAX]; | |
78 | ||
79 | assert(f); | |
80 | assert(ret); | |
81 | ||
82 | if (tcgetattr(fileno(f), &old_termios) >= 0) { | |
83 | new_termios = old_termios; | |
84 | ||
85 | new_termios.c_lflag &= ~ICANON; | |
86 | new_termios.c_cc[VMIN] = 1; | |
87 | new_termios.c_cc[VTIME] = 0; | |
88 | ||
89 | if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) { | |
90 | size_t k; | |
91 | ||
92 | if (t != USEC_INFINITY) { | |
93 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) { | |
94 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
95 | return -ETIMEDOUT; | |
96 | } | |
97 | } | |
98 | ||
99 | k = fread(&c, 1, 1, f); | |
100 | ||
101 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
102 | ||
103 | if (k <= 0) | |
104 | return -EIO; | |
105 | ||
106 | if (need_nl) | |
107 | *need_nl = c != '\n'; | |
108 | ||
109 | *ret = c; | |
110 | return 0; | |
111 | } | |
112 | } | |
113 | ||
114 | if (t != USEC_INFINITY) { | |
115 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) | |
116 | return -ETIMEDOUT; | |
117 | } | |
118 | ||
119 | errno = 0; | |
120 | if (!fgets(line, sizeof(line), f)) | |
121 | return errno ? -errno : -EIO; | |
122 | ||
123 | truncate_nl(line); | |
124 | ||
125 | if (strlen(line) != 1) | |
126 | return -EBADMSG; | |
127 | ||
128 | if (need_nl) | |
129 | *need_nl = false; | |
130 | ||
131 | *ret = line[0]; | |
132 | return 0; | |
133 | } | |
134 | ||
135 | int ask_char(char *ret, const char *replies, const char *text, ...) { | |
136 | int r; | |
137 | ||
138 | assert(ret); | |
139 | assert(replies); | |
140 | assert(text); | |
141 | ||
142 | for (;;) { | |
143 | va_list ap; | |
144 | char c; | |
145 | bool need_nl = true; | |
146 | ||
147 | if (on_tty()) | |
1fc464f6 | 148 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc RC |
149 | |
150 | va_start(ap, text); | |
151 | vprintf(text, ap); | |
152 | va_end(ap); | |
153 | ||
154 | if (on_tty()) | |
1fc464f6 | 155 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
156 | |
157 | fflush(stdout); | |
158 | ||
159 | r = read_one_char(stdin, &c, USEC_INFINITY, &need_nl); | |
160 | if (r < 0) { | |
161 | ||
162 | if (r == -EBADMSG) { | |
163 | puts("Bad input, please try again."); | |
164 | continue; | |
165 | } | |
166 | ||
167 | putchar('\n'); | |
168 | return r; | |
169 | } | |
170 | ||
171 | if (need_nl) | |
172 | putchar('\n'); | |
173 | ||
174 | if (strchr(replies, c)) { | |
175 | *ret = c; | |
176 | return 0; | |
177 | } | |
178 | ||
179 | puts("Read unexpected character, please try again."); | |
180 | } | |
181 | } | |
182 | ||
183 | int ask_string(char **ret, const char *text, ...) { | |
184 | assert(ret); | |
185 | assert(text); | |
186 | ||
187 | for (;;) { | |
188 | char line[LINE_MAX]; | |
189 | va_list ap; | |
190 | ||
191 | if (on_tty()) | |
1fc464f6 | 192 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc RC |
193 | |
194 | va_start(ap, text); | |
195 | vprintf(text, ap); | |
196 | va_end(ap); | |
197 | ||
198 | if (on_tty()) | |
1fc464f6 | 199 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
200 | |
201 | fflush(stdout); | |
202 | ||
203 | errno = 0; | |
204 | if (!fgets(line, sizeof(line), stdin)) | |
205 | return errno ? -errno : -EIO; | |
206 | ||
207 | if (!endswith(line, "\n")) | |
208 | putchar('\n'); | |
209 | else { | |
210 | char *s; | |
211 | ||
212 | if (isempty(line)) | |
213 | continue; | |
214 | ||
215 | truncate_nl(line); | |
216 | s = strdup(line); | |
217 | if (!s) | |
218 | return -ENOMEM; | |
219 | ||
220 | *ret = s; | |
221 | return 0; | |
222 | } | |
223 | } | |
224 | } | |
225 | ||
226 | int reset_terminal_fd(int fd, bool switch_to_text) { | |
227 | struct termios termios; | |
228 | int r = 0; | |
229 | ||
230 | /* Set terminal to some sane defaults */ | |
231 | ||
232 | assert(fd >= 0); | |
233 | ||
234 | /* We leave locked terminal attributes untouched, so that | |
235 | * Plymouth may set whatever it wants to set, and we don't | |
236 | * interfere with that. */ | |
237 | ||
238 | /* Disable exclusive mode, just in case */ | |
7d927c9a | 239 | (void) ioctl(fd, TIOCNXCL); |
288a74cc RC |
240 | |
241 | /* Switch to text mode */ | |
242 | if (switch_to_text) | |
7d927c9a | 243 | (void) ioctl(fd, KDSETMODE, KD_TEXT); |
288a74cc RC |
244 | |
245 | /* Enable console unicode mode */ | |
7d927c9a | 246 | (void) ioctl(fd, KDSKBMODE, K_UNICODE); |
288a74cc RC |
247 | |
248 | if (tcgetattr(fd, &termios) < 0) { | |
249 | r = -errno; | |
250 | goto finish; | |
251 | } | |
252 | ||
253 | /* We only reset the stuff that matters to the software. How | |
254 | * hardware is set up we don't touch assuming that somebody | |
255 | * else will do that for us */ | |
256 | ||
257 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
258 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
259 | termios.c_oflag |= ONLCR; | |
260 | termios.c_cflag |= CREAD; | |
261 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
262 | ||
263 | termios.c_cc[VINTR] = 03; /* ^C */ | |
264 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
265 | termios.c_cc[VERASE] = 0177; | |
266 | termios.c_cc[VKILL] = 025; /* ^X */ | |
267 | termios.c_cc[VEOF] = 04; /* ^D */ | |
268 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
269 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
270 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
271 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
272 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
273 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
274 | termios.c_cc[VEOL] = 0; | |
275 | termios.c_cc[VEOL2] = 0; | |
276 | ||
277 | termios.c_cc[VTIME] = 0; | |
278 | termios.c_cc[VMIN] = 1; | |
279 | ||
280 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
281 | r = -errno; | |
282 | ||
283 | finish: | |
284 | /* Just in case, flush all crap out */ | |
7d927c9a | 285 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
286 | |
287 | return r; | |
288 | } | |
289 | ||
290 | int reset_terminal(const char *name) { | |
291 | _cleanup_close_ int fd = -1; | |
292 | ||
0a8b555c LP |
293 | /* We open the terminal with O_NONBLOCK here, to ensure we |
294 | * don't block on carrier if this is a terminal with carrier | |
295 | * configured. */ | |
296 | ||
297 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
298 | if (fd < 0) |
299 | return fd; | |
300 | ||
301 | return reset_terminal_fd(fd, true); | |
302 | } | |
303 | ||
304 | int open_terminal(const char *name, int mode) { | |
305 | int fd, r; | |
306 | unsigned c = 0; | |
307 | ||
308 | /* | |
309 | * If a TTY is in the process of being closed opening it might | |
310 | * cause EIO. This is horribly awful, but unlikely to be | |
311 | * changed in the kernel. Hence we work around this problem by | |
312 | * retrying a couple of times. | |
313 | * | |
314 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
315 | */ | |
316 | ||
35bdab77 LP |
317 | if (mode & O_CREAT) |
318 | return -EINVAL; | |
288a74cc RC |
319 | |
320 | for (;;) { | |
321 | fd = open(name, mode, 0); | |
322 | if (fd >= 0) | |
323 | break; | |
324 | ||
325 | if (errno != EIO) | |
326 | return -errno; | |
327 | ||
328 | /* Max 1s in total */ | |
329 | if (c >= 20) | |
330 | return -errno; | |
331 | ||
332 | usleep(50 * USEC_PER_MSEC); | |
333 | c++; | |
334 | } | |
335 | ||
336 | r = isatty(fd); | |
337 | if (r < 0) { | |
338 | safe_close(fd); | |
339 | return -errno; | |
340 | } | |
341 | ||
342 | if (!r) { | |
343 | safe_close(fd); | |
344 | return -ENOTTY; | |
345 | } | |
346 | ||
347 | return fd; | |
348 | } | |
349 | ||
350 | int acquire_terminal( | |
351 | const char *name, | |
352 | bool fail, | |
353 | bool force, | |
354 | bool ignore_tiocstty_eperm, | |
355 | usec_t timeout) { | |
356 | ||
357 | int fd = -1, notify = -1, r = 0, wd = -1; | |
358 | usec_t ts = 0; | |
359 | ||
360 | assert(name); | |
361 | ||
362 | /* We use inotify to be notified when the tty is closed. We | |
363 | * create the watch before checking if we can actually acquire | |
364 | * it, so that we don't lose any event. | |
365 | * | |
366 | * Note: strictly speaking this actually watches for the | |
367 | * device being closed, it does *not* really watch whether a | |
368 | * tty loses its controlling process. However, unless some | |
369 | * rogue process uses TIOCNOTTY on /dev/tty *after* closing | |
370 | * its tty otherwise this will not become a problem. As long | |
371 | * as the administrator makes sure not configure any service | |
372 | * on the same tty as an untrusted user this should not be a | |
373 | * problem. (Which he probably should not do anyway.) */ | |
374 | ||
375 | if (timeout != USEC_INFINITY) | |
376 | ts = now(CLOCK_MONOTONIC); | |
377 | ||
378 | if (!fail && !force) { | |
379 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); | |
380 | if (notify < 0) { | |
381 | r = -errno; | |
382 | goto fail; | |
383 | } | |
384 | ||
385 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
386 | if (wd < 0) { | |
387 | r = -errno; | |
388 | goto fail; | |
389 | } | |
390 | } | |
391 | ||
392 | for (;;) { | |
393 | struct sigaction sa_old, sa_new = { | |
394 | .sa_handler = SIG_IGN, | |
395 | .sa_flags = SA_RESTART, | |
396 | }; | |
397 | ||
398 | if (notify >= 0) { | |
399 | r = flush_fd(notify); | |
400 | if (r < 0) | |
401 | goto fail; | |
402 | } | |
403 | ||
404 | /* We pass here O_NOCTTY only so that we can check the return | |
405 | * value TIOCSCTTY and have a reliable way to figure out if we | |
406 | * successfully became the controlling process of the tty */ | |
407 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
408 | if (fd < 0) | |
409 | return fd; | |
410 | ||
411 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
412 | * if we already own the tty. */ | |
413 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
414 | ||
415 | /* First, try to get the tty */ | |
416 | if (ioctl(fd, TIOCSCTTY, force) < 0) | |
417 | r = -errno; | |
418 | ||
419 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
420 | ||
421 | /* Sometimes it makes sense to ignore TIOCSCTTY | |
422 | * returning EPERM, i.e. when very likely we already | |
423 | * are have this controlling terminal. */ | |
424 | if (r < 0 && r == -EPERM && ignore_tiocstty_eperm) | |
425 | r = 0; | |
426 | ||
7d927c9a | 427 | if (r < 0 && (force || fail || r != -EPERM)) |
288a74cc | 428 | goto fail; |
288a74cc RC |
429 | |
430 | if (r >= 0) | |
431 | break; | |
432 | ||
433 | assert(!fail); | |
434 | assert(!force); | |
435 | assert(notify >= 0); | |
436 | ||
437 | for (;;) { | |
438 | union inotify_event_buffer buffer; | |
439 | struct inotify_event *e; | |
440 | ssize_t l; | |
441 | ||
442 | if (timeout != USEC_INFINITY) { | |
443 | usec_t n; | |
444 | ||
445 | n = now(CLOCK_MONOTONIC); | |
446 | if (ts + timeout < n) { | |
447 | r = -ETIMEDOUT; | |
448 | goto fail; | |
449 | } | |
450 | ||
451 | r = fd_wait_for_event(fd, POLLIN, ts + timeout - n); | |
452 | if (r < 0) | |
453 | goto fail; | |
454 | ||
455 | if (r == 0) { | |
456 | r = -ETIMEDOUT; | |
457 | goto fail; | |
458 | } | |
459 | } | |
460 | ||
461 | l = read(notify, &buffer, sizeof(buffer)); | |
462 | if (l < 0) { | |
463 | if (errno == EINTR || errno == EAGAIN) | |
464 | continue; | |
465 | ||
466 | r = -errno; | |
467 | goto fail; | |
468 | } | |
469 | ||
470 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
471 | if (e->wd != wd || !(e->mask & IN_CLOSE)) { | |
472 | r = -EIO; | |
473 | goto fail; | |
474 | } | |
475 | } | |
476 | ||
477 | break; | |
478 | } | |
479 | ||
480 | /* We close the tty fd here since if the old session | |
481 | * ended our handle will be dead. It's important that | |
482 | * we do this after sleeping, so that we don't enter | |
483 | * an endless loop. */ | |
484 | fd = safe_close(fd); | |
485 | } | |
486 | ||
487 | safe_close(notify); | |
488 | ||
288a74cc RC |
489 | return fd; |
490 | ||
491 | fail: | |
492 | safe_close(fd); | |
493 | safe_close(notify); | |
494 | ||
495 | return r; | |
496 | } | |
497 | ||
498 | int release_terminal(void) { | |
499 | static const struct sigaction sa_new = { | |
500 | .sa_handler = SIG_IGN, | |
501 | .sa_flags = SA_RESTART, | |
502 | }; | |
503 | ||
504 | _cleanup_close_ int fd = -1; | |
505 | struct sigaction sa_old; | |
506 | int r = 0; | |
507 | ||
0a8b555c | 508 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
509 | if (fd < 0) |
510 | return -errno; | |
511 | ||
512 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
513 | * by our own TIOCNOTTY */ | |
514 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
515 | ||
516 | if (ioctl(fd, TIOCNOTTY) < 0) | |
517 | r = -errno; | |
518 | ||
519 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
520 | ||
521 | return r; | |
522 | } | |
523 | ||
524 | int terminal_vhangup_fd(int fd) { | |
525 | assert(fd >= 0); | |
526 | ||
527 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
528 | return -errno; | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
533 | int terminal_vhangup(const char *name) { | |
534 | _cleanup_close_ int fd; | |
535 | ||
0a8b555c | 536 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
537 | if (fd < 0) |
538 | return fd; | |
539 | ||
540 | return terminal_vhangup_fd(fd); | |
541 | } | |
542 | ||
543 | int vt_disallocate(const char *name) { | |
1ba23931 | 544 | _cleanup_close_ int fd = -1; |
288a74cc | 545 | unsigned u; |
1ba23931 | 546 | int r; |
288a74cc RC |
547 | |
548 | /* Deallocate the VT if possible. If not possible | |
549 | * (i.e. because it is the active one), at least clear it | |
550 | * entirely (including the scrollback buffer) */ | |
551 | ||
552 | if (!startswith(name, "/dev/")) | |
553 | return -EINVAL; | |
554 | ||
555 | if (!tty_is_vc(name)) { | |
556 | /* So this is not a VT. I guess we cannot deallocate | |
557 | * it then. But let's at least clear the screen */ | |
558 | ||
559 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
560 | if (fd < 0) | |
561 | return fd; | |
562 | ||
563 | loop_write(fd, | |
564 | "\033[r" /* clear scrolling region */ | |
565 | "\033[H" /* move home */ | |
566 | "\033[2J", /* clear screen */ | |
567 | 10, false); | |
288a74cc RC |
568 | return 0; |
569 | } | |
570 | ||
571 | if (!startswith(name, "/dev/tty")) | |
572 | return -EINVAL; | |
573 | ||
574 | r = safe_atou(name+8, &u); | |
575 | if (r < 0) | |
576 | return r; | |
577 | ||
578 | if (u <= 0) | |
579 | return -EINVAL; | |
580 | ||
581 | /* Try to deallocate */ | |
0a8b555c | 582 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
583 | if (fd < 0) |
584 | return fd; | |
585 | ||
586 | r = ioctl(fd, VT_DISALLOCATE, u); | |
1ba23931 | 587 | fd = safe_close(fd); |
288a74cc RC |
588 | |
589 | if (r >= 0) | |
590 | return 0; | |
591 | ||
592 | if (errno != EBUSY) | |
593 | return -errno; | |
594 | ||
595 | /* Couldn't deallocate, so let's clear it fully with | |
596 | * scrollback */ | |
597 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
598 | if (fd < 0) | |
599 | return fd; | |
600 | ||
601 | loop_write(fd, | |
602 | "\033[r" /* clear scrolling region */ | |
603 | "\033[H" /* move home */ | |
604 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
605 | 10, false); | |
288a74cc RC |
606 | return 0; |
607 | } | |
608 | ||
288a74cc RC |
609 | int make_console_stdio(void) { |
610 | int fd, r; | |
611 | ||
612 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr */ | |
613 | ||
614 | fd = acquire_terminal("/dev/console", false, true, true, USEC_INFINITY); | |
615 | if (fd < 0) | |
616 | return log_error_errno(fd, "Failed to acquire terminal: %m"); | |
617 | ||
3d18b167 LP |
618 | r = reset_terminal_fd(fd, true); |
619 | if (r < 0) | |
620 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
621 | ||
288a74cc RC |
622 | r = make_stdio(fd); |
623 | if (r < 0) | |
624 | return log_error_errno(r, "Failed to duplicate terminal fd: %m"); | |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
629 | int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) { | |
630 | static const char status_indent[] = " "; /* "[" STATUS "] " */ | |
631 | _cleanup_free_ char *s = NULL; | |
632 | _cleanup_close_ int fd = -1; | |
633 | struct iovec iovec[6] = {}; | |
634 | int n = 0; | |
635 | static bool prev_ephemeral; | |
636 | ||
637 | assert(format); | |
638 | ||
639 | /* This is independent of logging, as status messages are | |
640 | * optional and go exclusively to the console. */ | |
641 | ||
642 | if (vasprintf(&s, format, ap) < 0) | |
643 | return log_oom(); | |
644 | ||
645 | fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); | |
646 | if (fd < 0) | |
647 | return fd; | |
648 | ||
649 | if (ellipse) { | |
650 | char *e; | |
651 | size_t emax, sl; | |
652 | int c; | |
653 | ||
654 | c = fd_columns(fd); | |
655 | if (c <= 0) | |
656 | c = 80; | |
657 | ||
658 | sl = status ? sizeof(status_indent)-1 : 0; | |
659 | ||
660 | emax = c - sl - 1; | |
661 | if (emax < 3) | |
662 | emax = 3; | |
663 | ||
664 | e = ellipsize(s, emax, 50); | |
665 | if (e) { | |
666 | free(s); | |
667 | s = e; | |
668 | } | |
669 | } | |
670 | ||
671 | if (prev_ephemeral) | |
672 | IOVEC_SET_STRING(iovec[n++], "\r" ANSI_ERASE_TO_END_OF_LINE); | |
673 | prev_ephemeral = ephemeral; | |
674 | ||
675 | if (status) { | |
676 | if (!isempty(status)) { | |
677 | IOVEC_SET_STRING(iovec[n++], "["); | |
678 | IOVEC_SET_STRING(iovec[n++], status); | |
679 | IOVEC_SET_STRING(iovec[n++], "] "); | |
680 | } else | |
681 | IOVEC_SET_STRING(iovec[n++], status_indent); | |
682 | } | |
683 | ||
684 | IOVEC_SET_STRING(iovec[n++], s); | |
685 | if (!ephemeral) | |
686 | IOVEC_SET_STRING(iovec[n++], "\n"); | |
687 | ||
688 | if (writev(fd, iovec, n) < 0) | |
689 | return -errno; | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
694 | int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) { | |
695 | va_list ap; | |
696 | int r; | |
697 | ||
698 | assert(format); | |
699 | ||
700 | va_start(ap, format); | |
701 | r = status_vprintf(status, ellipse, ephemeral, format, ap); | |
702 | va_end(ap); | |
703 | ||
704 | return r; | |
705 | } | |
706 | ||
707 | bool tty_is_vc(const char *tty) { | |
708 | assert(tty); | |
709 | ||
710 | return vtnr_from_tty(tty) >= 0; | |
711 | } | |
712 | ||
713 | bool tty_is_console(const char *tty) { | |
714 | assert(tty); | |
715 | ||
716 | if (startswith(tty, "/dev/")) | |
717 | tty += 5; | |
718 | ||
719 | return streq(tty, "console"); | |
720 | } | |
721 | ||
722 | int vtnr_from_tty(const char *tty) { | |
723 | int i, r; | |
724 | ||
725 | assert(tty); | |
726 | ||
727 | if (startswith(tty, "/dev/")) | |
728 | tty += 5; | |
729 | ||
730 | if (!startswith(tty, "tty") ) | |
731 | return -EINVAL; | |
732 | ||
733 | if (tty[3] < '0' || tty[3] > '9') | |
734 | return -EINVAL; | |
735 | ||
736 | r = safe_atoi(tty+3, &i); | |
737 | if (r < 0) | |
738 | return r; | |
739 | ||
740 | if (i < 0 || i > 63) | |
741 | return -EINVAL; | |
742 | ||
743 | return i; | |
744 | } | |
745 | ||
746 | char *resolve_dev_console(char **active) { | |
747 | char *tty; | |
748 | ||
749 | /* Resolve where /dev/console is pointing to, if /sys is actually ours | |
750 | * (i.e. not read-only-mounted which is a sign for container setups) */ | |
751 | ||
752 | if (path_is_read_only_fs("/sys") > 0) | |
753 | return NULL; | |
754 | ||
755 | if (read_one_line_file("/sys/class/tty/console/active", active) < 0) | |
756 | return NULL; | |
757 | ||
758 | /* If multiple log outputs are configured the last one is what | |
759 | * /dev/console points to */ | |
760 | tty = strrchr(*active, ' '); | |
761 | if (tty) | |
762 | tty++; | |
763 | else | |
764 | tty = *active; | |
765 | ||
766 | if (streq(tty, "tty0")) { | |
767 | char *tmp; | |
768 | ||
769 | /* Get the active VC (e.g. tty1) */ | |
770 | if (read_one_line_file("/sys/class/tty/tty0/active", &tmp) >= 0) { | |
771 | free(*active); | |
772 | tty = *active = tmp; | |
773 | } | |
774 | } | |
775 | ||
776 | return tty; | |
777 | } | |
778 | ||
779 | bool tty_is_vc_resolve(const char *tty) { | |
780 | _cleanup_free_ char *active = NULL; | |
781 | ||
782 | assert(tty); | |
783 | ||
784 | if (startswith(tty, "/dev/")) | |
785 | tty += 5; | |
786 | ||
787 | if (streq(tty, "console")) { | |
788 | tty = resolve_dev_console(&active); | |
789 | if (!tty) | |
790 | return false; | |
791 | } | |
792 | ||
793 | return tty_is_vc(tty); | |
794 | } | |
795 | ||
796 | const char *default_term_for_tty(const char *tty) { | |
797 | assert(tty); | |
798 | ||
799 | return tty_is_vc_resolve(tty) ? "TERM=linux" : "TERM=vt220"; | |
800 | } | |
801 | ||
802 | int fd_columns(int fd) { | |
803 | struct winsize ws = {}; | |
804 | ||
805 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
806 | return -errno; | |
807 | ||
808 | if (ws.ws_col <= 0) | |
809 | return -EIO; | |
810 | ||
811 | return ws.ws_col; | |
812 | } | |
813 | ||
814 | unsigned columns(void) { | |
815 | const char *e; | |
816 | int c; | |
817 | ||
818 | if (_likely_(cached_columns > 0)) | |
819 | return cached_columns; | |
820 | ||
821 | c = 0; | |
822 | e = getenv("COLUMNS"); | |
823 | if (e) | |
824 | (void) safe_atoi(e, &c); | |
825 | ||
826 | if (c <= 0) | |
827 | c = fd_columns(STDOUT_FILENO); | |
828 | ||
829 | if (c <= 0) | |
830 | c = 80; | |
831 | ||
832 | cached_columns = c; | |
833 | return cached_columns; | |
834 | } | |
835 | ||
836 | int fd_lines(int fd) { | |
837 | struct winsize ws = {}; | |
838 | ||
839 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
840 | return -errno; | |
841 | ||
842 | if (ws.ws_row <= 0) | |
843 | return -EIO; | |
844 | ||
845 | return ws.ws_row; | |
846 | } | |
847 | ||
848 | unsigned lines(void) { | |
849 | const char *e; | |
850 | int l; | |
851 | ||
852 | if (_likely_(cached_lines > 0)) | |
853 | return cached_lines; | |
854 | ||
855 | l = 0; | |
856 | e = getenv("LINES"); | |
857 | if (e) | |
858 | (void) safe_atoi(e, &l); | |
859 | ||
860 | if (l <= 0) | |
861 | l = fd_lines(STDOUT_FILENO); | |
862 | ||
863 | if (l <= 0) | |
864 | l = 24; | |
865 | ||
866 | cached_lines = l; | |
867 | return cached_lines; | |
868 | } | |
869 | ||
870 | /* intended to be used as a SIGWINCH sighandler */ | |
871 | void columns_lines_cache_reset(int signum) { | |
872 | cached_columns = 0; | |
873 | cached_lines = 0; | |
874 | } | |
875 | ||
876 | bool on_tty(void) { | |
877 | static int cached_on_tty = -1; | |
878 | ||
879 | if (_unlikely_(cached_on_tty < 0)) | |
880 | cached_on_tty = isatty(STDOUT_FILENO) > 0; | |
881 | ||
882 | return cached_on_tty; | |
883 | } | |
884 | ||
885 | int make_stdio(int fd) { | |
886 | int r, s, t; | |
887 | ||
888 | assert(fd >= 0); | |
889 | ||
890 | r = dup2(fd, STDIN_FILENO); | |
891 | s = dup2(fd, STDOUT_FILENO); | |
892 | t = dup2(fd, STDERR_FILENO); | |
893 | ||
894 | if (fd >= 3) | |
895 | safe_close(fd); | |
896 | ||
897 | if (r < 0 || s < 0 || t < 0) | |
898 | return -errno; | |
899 | ||
900 | /* Explicitly unset O_CLOEXEC, since if fd was < 3, then | |
901 | * dup2() was a NOP and the bit hence possibly set. */ | |
902 | fd_cloexec(STDIN_FILENO, false); | |
903 | fd_cloexec(STDOUT_FILENO, false); | |
904 | fd_cloexec(STDERR_FILENO, false); | |
905 | ||
906 | return 0; | |
907 | } | |
908 | ||
909 | int make_null_stdio(void) { | |
910 | int null_fd; | |
911 | ||
912 | null_fd = open("/dev/null", O_RDWR|O_NOCTTY); | |
913 | if (null_fd < 0) | |
914 | return -errno; | |
915 | ||
916 | return make_stdio(null_fd); | |
917 | } | |
918 | ||
919 | int getttyname_malloc(int fd, char **ret) { | |
920 | size_t l = 100; | |
921 | int r; | |
922 | ||
923 | assert(fd >= 0); | |
924 | assert(ret); | |
925 | ||
926 | for (;;) { | |
927 | char path[l]; | |
928 | ||
929 | r = ttyname_r(fd, path, sizeof(path)); | |
930 | if (r == 0) { | |
931 | const char *p; | |
932 | char *c; | |
933 | ||
934 | p = startswith(path, "/dev/"); | |
935 | c = strdup(p ?: path); | |
936 | if (!c) | |
937 | return -ENOMEM; | |
938 | ||
939 | *ret = c; | |
940 | return 0; | |
941 | } | |
942 | ||
943 | if (r != ERANGE) | |
944 | return -r; | |
945 | ||
946 | l *= 2; | |
947 | } | |
948 | ||
949 | return 0; | |
950 | } | |
951 | ||
952 | int getttyname_harder(int fd, char **r) { | |
953 | int k; | |
954 | char *s = NULL; | |
955 | ||
956 | k = getttyname_malloc(fd, &s); | |
957 | if (k < 0) | |
958 | return k; | |
959 | ||
960 | if (streq(s, "tty")) { | |
961 | free(s); | |
962 | return get_ctty(0, NULL, r); | |
963 | } | |
964 | ||
965 | *r = s; | |
966 | return 0; | |
967 | } | |
968 | ||
969 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
970 | int r; | |
971 | _cleanup_free_ char *line = NULL; | |
972 | const char *p; | |
973 | unsigned long ttynr; | |
974 | ||
975 | assert(pid >= 0); | |
976 | ||
977 | p = procfs_file_alloca(pid, "stat"); | |
978 | r = read_one_line_file(p, &line); | |
979 | if (r < 0) | |
980 | return r; | |
981 | ||
982 | p = strrchr(line, ')'); | |
983 | if (!p) | |
984 | return -EIO; | |
985 | ||
986 | p++; | |
987 | ||
988 | if (sscanf(p, " " | |
989 | "%*c " /* state */ | |
990 | "%*d " /* ppid */ | |
991 | "%*d " /* pgrp */ | |
992 | "%*d " /* session */ | |
993 | "%lu ", /* ttynr */ | |
994 | &ttynr) != 1) | |
995 | return -EIO; | |
996 | ||
997 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
cfeaa44a | 998 | return -ENXIO; |
288a74cc RC |
999 | |
1000 | if (d) | |
1001 | *d = (dev_t) ttynr; | |
1002 | ||
1003 | return 0; | |
1004 | } | |
1005 | ||
1006 | int get_ctty(pid_t pid, dev_t *_devnr, char **r) { | |
1007 | char fn[sizeof("/dev/char/")-1 + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL; | |
1008 | _cleanup_free_ char *s = NULL; | |
1009 | const char *p; | |
1010 | dev_t devnr; | |
1011 | int k; | |
1012 | ||
1013 | assert(r); | |
1014 | ||
1015 | k = get_ctty_devnr(pid, &devnr); | |
1016 | if (k < 0) | |
1017 | return k; | |
1018 | ||
1019 | sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr)); | |
1020 | ||
1021 | k = readlink_malloc(fn, &s); | |
1022 | if (k < 0) { | |
1023 | ||
1024 | if (k != -ENOENT) | |
1025 | return k; | |
1026 | ||
1027 | /* This is an ugly hack */ | |
1028 | if (major(devnr) == 136) { | |
1029 | if (asprintf(&b, "pts/%u", minor(devnr)) < 0) | |
1030 | return -ENOMEM; | |
1031 | } else { | |
1032 | /* Probably something like the ptys which have no | |
1033 | * symlink in /dev/char. Let's return something | |
1034 | * vaguely useful. */ | |
1035 | ||
1036 | b = strdup(fn + 5); | |
1037 | if (!b) | |
1038 | return -ENOMEM; | |
1039 | } | |
1040 | } else { | |
1041 | if (startswith(s, "/dev/")) | |
1042 | p = s + 5; | |
1043 | else if (startswith(s, "../")) | |
1044 | p = s + 3; | |
1045 | else | |
1046 | p = s; | |
1047 | ||
1048 | b = strdup(p); | |
1049 | if (!b) | |
1050 | return -ENOMEM; | |
1051 | } | |
1052 | ||
1053 | *r = b; | |
1054 | if (_devnr) | |
1055 | *_devnr = devnr; | |
1056 | ||
1057 | return 0; | |
1058 | } | |
a07c35c3 | 1059 | |
66cb2fde LP |
1060 | int ptsname_malloc(int fd, char **ret) { |
1061 | size_t l = 100; | |
1062 | ||
1063 | assert(fd >= 0); | |
1064 | assert(ret); | |
1065 | ||
1066 | for (;;) { | |
1067 | char *c; | |
1068 | ||
1069 | c = new(char, l); | |
1070 | if (!c) | |
1071 | return -ENOMEM; | |
1072 | ||
1073 | if (ptsname_r(fd, c, l) == 0) { | |
1074 | *ret = c; | |
1075 | return 0; | |
1076 | } | |
1077 | if (errno != ERANGE) { | |
1078 | free(c); | |
1079 | return -errno; | |
1080 | } | |
1081 | ||
1082 | free(c); | |
1083 | l *= 2; | |
1084 | } | |
1085 | } | |
1086 | ||
a07c35c3 LP |
1087 | int ptsname_namespace(int pty, char **ret) { |
1088 | int no = -1, r; | |
1089 | ||
1090 | /* Like ptsname(), but doesn't assume that the path is | |
1091 | * accessible in the local namespace. */ | |
1092 | ||
1093 | r = ioctl(pty, TIOCGPTN, &no); | |
1094 | if (r < 0) | |
1095 | return -errno; | |
1096 | ||
1097 | if (no < 0) | |
1098 | return -EIO; | |
1099 | ||
1100 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1101 | return -ENOMEM; | |
1102 | ||
1103 | return 0; | |
1104 | } | |
66cb2fde LP |
1105 | |
1106 | int openpt_in_namespace(pid_t pid, int flags) { | |
1107 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1108 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
1109 | siginfo_t si; | |
1110 | pid_t child; | |
1111 | int r; | |
1112 | ||
1113 | assert(pid > 0); | |
1114 | ||
1115 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1116 | if (r < 0) | |
1117 | return r; | |
1118 | ||
1119 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1120 | return -errno; | |
1121 | ||
1122 | child = fork(); | |
1123 | if (child < 0) | |
1124 | return -errno; | |
1125 | ||
1126 | if (child == 0) { | |
1127 | int master; | |
1128 | ||
1129 | pair[0] = safe_close(pair[0]); | |
1130 | ||
1131 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1132 | if (r < 0) | |
1133 | _exit(EXIT_FAILURE); | |
1134 | ||
1135 | master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); | |
1136 | if (master < 0) | |
1137 | _exit(EXIT_FAILURE); | |
1138 | ||
1139 | if (unlockpt(master) < 0) | |
1140 | _exit(EXIT_FAILURE); | |
1141 | ||
1142 | if (send_one_fd(pair[1], master, 0) < 0) | |
1143 | _exit(EXIT_FAILURE); | |
1144 | ||
1145 | _exit(EXIT_SUCCESS); | |
1146 | } | |
1147 | ||
1148 | pair[1] = safe_close(pair[1]); | |
1149 | ||
1150 | r = wait_for_terminate(child, &si); | |
1151 | if (r < 0) | |
1152 | return r; | |
1153 | if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS) | |
1154 | return -EIO; | |
1155 | ||
1156 | return receive_one_fd(pair[0], 0); | |
1157 | } | |
40e1f4ea LP |
1158 | |
1159 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
1160 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1161 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
1162 | siginfo_t si; | |
1163 | pid_t child; | |
1164 | int r; | |
1165 | ||
1166 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1167 | if (r < 0) | |
1168 | return r; | |
1169 | ||
1170 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1171 | return -errno; | |
1172 | ||
1173 | child = fork(); | |
1174 | if (child < 0) | |
1175 | return -errno; | |
1176 | ||
1177 | if (child == 0) { | |
1178 | int master; | |
1179 | ||
1180 | pair[0] = safe_close(pair[0]); | |
1181 | ||
1182 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1183 | if (r < 0) | |
1184 | _exit(EXIT_FAILURE); | |
1185 | ||
1186 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); | |
1187 | if (master < 0) | |
1188 | _exit(EXIT_FAILURE); | |
1189 | ||
1190 | if (send_one_fd(pair[1], master, 0) < 0) | |
1191 | _exit(EXIT_FAILURE); | |
1192 | ||
1193 | _exit(EXIT_SUCCESS); | |
1194 | } | |
1195 | ||
1196 | pair[1] = safe_close(pair[1]); | |
1197 | ||
1198 | r = wait_for_terminate(child, &si); | |
1199 | if (r < 0) | |
1200 | return r; | |
1201 | if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS) | |
1202 | return -EIO; | |
1203 | ||
1204 | return receive_one_fd(pair[0], 0); | |
1205 | } |