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Commit | Line | Data |
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288a74cc RC |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
11c3a366 | 20 | #include <errno.h> |
07630cea | 21 | #include <fcntl.h> |
11c3a366 TA |
22 | #include <limits.h> |
23 | #include <stdarg.h> | |
24 | #include <stddef.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <sys/inotify.h> | |
28 | #include <sys/socket.h> | |
29 | #include <sys/sysmacros.h> | |
30 | #include <sys/time.h> | |
07630cea LP |
31 | #include <linux/kd.h> |
32 | #include <linux/tiocl.h> | |
33 | #include <linux/vt.h> | |
34 | #include <poll.h> | |
35 | #include <signal.h> | |
288a74cc | 36 | #include <sys/ioctl.h> |
07630cea | 37 | #include <sys/types.h> |
288a74cc | 38 | #include <termios.h> |
07630cea | 39 | #include <unistd.h> |
288a74cc | 40 | |
b5efdb8a | 41 | #include "alloc-util.h" |
acf553b0 | 42 | #include "env-util.h" |
3ffd4af2 | 43 | #include "fd-util.h" |
288a74cc | 44 | #include "fileio.h" |
f4f15635 | 45 | #include "fs-util.h" |
c004493c | 46 | #include "io-util.h" |
93cc7779 TA |
47 | #include "log.h" |
48 | #include "macro.h" | |
6bedfcbb | 49 | #include "parse-util.h" |
07630cea | 50 | #include "process-util.h" |
2583fbea | 51 | #include "socket-util.h" |
8fcde012 | 52 | #include "stat-util.h" |
07630cea | 53 | #include "string-util.h" |
6af62124 | 54 | #include "strv.h" |
3ffd4af2 | 55 | #include "terminal-util.h" |
07630cea LP |
56 | #include "time-util.h" |
57 | #include "util.h" | |
27458ed6 | 58 | #include "path-util.h" |
288a74cc RC |
59 | |
60 | static volatile unsigned cached_columns = 0; | |
61 | static volatile unsigned cached_lines = 0; | |
62 | ||
63 | int chvt(int vt) { | |
64 | _cleanup_close_ int fd; | |
65 | ||
0a8b555c | 66 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
67 | if (fd < 0) |
68 | return -errno; | |
69 | ||
b9e74c39 | 70 | if (vt <= 0) { |
288a74cc RC |
71 | int tiocl[2] = { |
72 | TIOCL_GETKMSGREDIRECT, | |
73 | 0 | |
74 | }; | |
75 | ||
76 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
77 | return -errno; | |
78 | ||
79 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
80 | } | |
81 | ||
82 | if (ioctl(fd, VT_ACTIVATE, vt) < 0) | |
83 | return -errno; | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { | |
89 | struct termios old_termios, new_termios; | |
90 | char c, line[LINE_MAX]; | |
91 | ||
92 | assert(f); | |
93 | assert(ret); | |
94 | ||
95 | if (tcgetattr(fileno(f), &old_termios) >= 0) { | |
96 | new_termios = old_termios; | |
97 | ||
98 | new_termios.c_lflag &= ~ICANON; | |
99 | new_termios.c_cc[VMIN] = 1; | |
100 | new_termios.c_cc[VTIME] = 0; | |
101 | ||
102 | if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) { | |
103 | size_t k; | |
104 | ||
105 | if (t != USEC_INFINITY) { | |
106 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) { | |
107 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
108 | return -ETIMEDOUT; | |
109 | } | |
110 | } | |
111 | ||
112 | k = fread(&c, 1, 1, f); | |
113 | ||
114 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
115 | ||
116 | if (k <= 0) | |
117 | return -EIO; | |
118 | ||
119 | if (need_nl) | |
120 | *need_nl = c != '\n'; | |
121 | ||
122 | *ret = c; | |
123 | return 0; | |
124 | } | |
125 | } | |
126 | ||
127 | if (t != USEC_INFINITY) { | |
128 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) | |
129 | return -ETIMEDOUT; | |
130 | } | |
131 | ||
132 | errno = 0; | |
133 | if (!fgets(line, sizeof(line), f)) | |
f5e5c28f | 134 | return errno > 0 ? -errno : -EIO; |
288a74cc RC |
135 | |
136 | truncate_nl(line); | |
137 | ||
138 | if (strlen(line) != 1) | |
139 | return -EBADMSG; | |
140 | ||
141 | if (need_nl) | |
142 | *need_nl = false; | |
143 | ||
144 | *ret = line[0]; | |
145 | return 0; | |
146 | } | |
147 | ||
3c670f89 FB |
148 | #define DEFAULT_ASK_REFRESH_USEC (2*USEC_PER_SEC) |
149 | ||
150 | int ask_char(char *ret, const char *replies, const char *fmt, ...) { | |
288a74cc RC |
151 | int r; |
152 | ||
153 | assert(ret); | |
154 | assert(replies); | |
3c670f89 | 155 | assert(fmt); |
288a74cc RC |
156 | |
157 | for (;;) { | |
158 | va_list ap; | |
159 | char c; | |
160 | bool need_nl = true; | |
161 | ||
7565bb98 | 162 | if (colors_enabled()) |
1fc464f6 | 163 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc | 164 | |
3c670f89 FB |
165 | putchar('\r'); |
166 | ||
167 | va_start(ap, fmt); | |
168 | vprintf(fmt, ap); | |
288a74cc RC |
169 | va_end(ap); |
170 | ||
7565bb98 | 171 | if (colors_enabled()) |
1fc464f6 | 172 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
173 | |
174 | fflush(stdout); | |
175 | ||
3c670f89 | 176 | r = read_one_char(stdin, &c, DEFAULT_ASK_REFRESH_USEC, &need_nl); |
288a74cc RC |
177 | if (r < 0) { |
178 | ||
3c670f89 FB |
179 | if (r == -ETIMEDOUT) |
180 | continue; | |
181 | ||
288a74cc RC |
182 | if (r == -EBADMSG) { |
183 | puts("Bad input, please try again."); | |
184 | continue; | |
185 | } | |
186 | ||
187 | putchar('\n'); | |
188 | return r; | |
189 | } | |
190 | ||
191 | if (need_nl) | |
192 | putchar('\n'); | |
193 | ||
194 | if (strchr(replies, c)) { | |
195 | *ret = c; | |
196 | return 0; | |
197 | } | |
198 | ||
199 | puts("Read unexpected character, please try again."); | |
200 | } | |
201 | } | |
202 | ||
203 | int ask_string(char **ret, const char *text, ...) { | |
204 | assert(ret); | |
205 | assert(text); | |
206 | ||
207 | for (;;) { | |
208 | char line[LINE_MAX]; | |
209 | va_list ap; | |
210 | ||
7565bb98 | 211 | if (colors_enabled()) |
1fc464f6 | 212 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc RC |
213 | |
214 | va_start(ap, text); | |
215 | vprintf(text, ap); | |
216 | va_end(ap); | |
217 | ||
7565bb98 | 218 | if (colors_enabled()) |
1fc464f6 | 219 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
220 | |
221 | fflush(stdout); | |
222 | ||
223 | errno = 0; | |
224 | if (!fgets(line, sizeof(line), stdin)) | |
f5e5c28f | 225 | return errno > 0 ? -errno : -EIO; |
288a74cc RC |
226 | |
227 | if (!endswith(line, "\n")) | |
228 | putchar('\n'); | |
229 | else { | |
230 | char *s; | |
231 | ||
232 | if (isempty(line)) | |
233 | continue; | |
234 | ||
235 | truncate_nl(line); | |
236 | s = strdup(line); | |
237 | if (!s) | |
238 | return -ENOMEM; | |
239 | ||
240 | *ret = s; | |
241 | return 0; | |
242 | } | |
243 | } | |
244 | } | |
245 | ||
246 | int reset_terminal_fd(int fd, bool switch_to_text) { | |
247 | struct termios termios; | |
73e669e0 TP |
248 | _cleanup_free_ char *utf8 = NULL; |
249 | int kb; | |
288a74cc RC |
250 | int r = 0; |
251 | ||
252 | /* Set terminal to some sane defaults */ | |
253 | ||
254 | assert(fd >= 0); | |
255 | ||
256 | /* We leave locked terminal attributes untouched, so that | |
257 | * Plymouth may set whatever it wants to set, and we don't | |
258 | * interfere with that. */ | |
259 | ||
260 | /* Disable exclusive mode, just in case */ | |
7d927c9a | 261 | (void) ioctl(fd, TIOCNXCL); |
288a74cc RC |
262 | |
263 | /* Switch to text mode */ | |
264 | if (switch_to_text) | |
7d927c9a | 265 | (void) ioctl(fd, KDSETMODE, KD_TEXT); |
288a74cc | 266 | |
73e669e0 TP |
267 | /* Set default keyboard mode */ |
268 | if (read_one_line_file("/sys/module/vt/parameters/default_utf8", &utf8) >= 0 && parse_boolean(utf8) == 0) | |
269 | kb = K_XLATE; | |
270 | else | |
271 | kb = K_UNICODE; | |
272 | (void) ioctl(fd, KDSKBMODE, kb); | |
288a74cc RC |
273 | |
274 | if (tcgetattr(fd, &termios) < 0) { | |
275 | r = -errno; | |
276 | goto finish; | |
277 | } | |
278 | ||
279 | /* We only reset the stuff that matters to the software. How | |
280 | * hardware is set up we don't touch assuming that somebody | |
281 | * else will do that for us */ | |
282 | ||
283 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
284 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
285 | termios.c_oflag |= ONLCR; | |
286 | termios.c_cflag |= CREAD; | |
287 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
288 | ||
289 | termios.c_cc[VINTR] = 03; /* ^C */ | |
290 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
291 | termios.c_cc[VERASE] = 0177; | |
292 | termios.c_cc[VKILL] = 025; /* ^X */ | |
293 | termios.c_cc[VEOF] = 04; /* ^D */ | |
294 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
295 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
296 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
297 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
298 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
299 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
300 | termios.c_cc[VEOL] = 0; | |
301 | termios.c_cc[VEOL2] = 0; | |
302 | ||
303 | termios.c_cc[VTIME] = 0; | |
304 | termios.c_cc[VMIN] = 1; | |
305 | ||
306 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
307 | r = -errno; | |
308 | ||
309 | finish: | |
310 | /* Just in case, flush all crap out */ | |
7d927c9a | 311 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
312 | |
313 | return r; | |
314 | } | |
315 | ||
316 | int reset_terminal(const char *name) { | |
317 | _cleanup_close_ int fd = -1; | |
318 | ||
0a8b555c LP |
319 | /* We open the terminal with O_NONBLOCK here, to ensure we |
320 | * don't block on carrier if this is a terminal with carrier | |
321 | * configured. */ | |
322 | ||
323 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
324 | if (fd < 0) |
325 | return fd; | |
326 | ||
327 | return reset_terminal_fd(fd, true); | |
328 | } | |
329 | ||
330 | int open_terminal(const char *name, int mode) { | |
331 | int fd, r; | |
332 | unsigned c = 0; | |
333 | ||
334 | /* | |
335 | * If a TTY is in the process of being closed opening it might | |
336 | * cause EIO. This is horribly awful, but unlikely to be | |
337 | * changed in the kernel. Hence we work around this problem by | |
338 | * retrying a couple of times. | |
339 | * | |
340 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
341 | */ | |
342 | ||
35bdab77 LP |
343 | if (mode & O_CREAT) |
344 | return -EINVAL; | |
288a74cc RC |
345 | |
346 | for (;;) { | |
347 | fd = open(name, mode, 0); | |
348 | if (fd >= 0) | |
349 | break; | |
350 | ||
351 | if (errno != EIO) | |
352 | return -errno; | |
353 | ||
354 | /* Max 1s in total */ | |
355 | if (c >= 20) | |
356 | return -errno; | |
357 | ||
358 | usleep(50 * USEC_PER_MSEC); | |
359 | c++; | |
360 | } | |
361 | ||
362 | r = isatty(fd); | |
e6c9fa74 | 363 | if (r == 0) { |
288a74cc RC |
364 | safe_close(fd); |
365 | return -ENOTTY; | |
366 | } | |
367 | ||
368 | return fd; | |
369 | } | |
370 | ||
371 | int acquire_terminal( | |
372 | const char *name, | |
373 | bool fail, | |
374 | bool force, | |
375 | bool ignore_tiocstty_eperm, | |
376 | usec_t timeout) { | |
377 | ||
378 | int fd = -1, notify = -1, r = 0, wd = -1; | |
379 | usec_t ts = 0; | |
380 | ||
381 | assert(name); | |
382 | ||
383 | /* We use inotify to be notified when the tty is closed. We | |
384 | * create the watch before checking if we can actually acquire | |
385 | * it, so that we don't lose any event. | |
386 | * | |
387 | * Note: strictly speaking this actually watches for the | |
388 | * device being closed, it does *not* really watch whether a | |
389 | * tty loses its controlling process. However, unless some | |
390 | * rogue process uses TIOCNOTTY on /dev/tty *after* closing | |
391 | * its tty otherwise this will not become a problem. As long | |
392 | * as the administrator makes sure not configure any service | |
393 | * on the same tty as an untrusted user this should not be a | |
394 | * problem. (Which he probably should not do anyway.) */ | |
395 | ||
396 | if (timeout != USEC_INFINITY) | |
397 | ts = now(CLOCK_MONOTONIC); | |
398 | ||
399 | if (!fail && !force) { | |
400 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); | |
401 | if (notify < 0) { | |
402 | r = -errno; | |
403 | goto fail; | |
404 | } | |
405 | ||
406 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
407 | if (wd < 0) { | |
408 | r = -errno; | |
409 | goto fail; | |
410 | } | |
411 | } | |
412 | ||
413 | for (;;) { | |
414 | struct sigaction sa_old, sa_new = { | |
415 | .sa_handler = SIG_IGN, | |
416 | .sa_flags = SA_RESTART, | |
417 | }; | |
418 | ||
419 | if (notify >= 0) { | |
420 | r = flush_fd(notify); | |
421 | if (r < 0) | |
422 | goto fail; | |
423 | } | |
424 | ||
425 | /* We pass here O_NOCTTY only so that we can check the return | |
426 | * value TIOCSCTTY and have a reliable way to figure out if we | |
427 | * successfully became the controlling process of the tty */ | |
428 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
429 | if (fd < 0) | |
430 | return fd; | |
431 | ||
432 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
433 | * if we already own the tty. */ | |
434 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
435 | ||
436 | /* First, try to get the tty */ | |
437 | if (ioctl(fd, TIOCSCTTY, force) < 0) | |
438 | r = -errno; | |
439 | ||
440 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
441 | ||
b938cb90 | 442 | /* Sometimes, it makes sense to ignore TIOCSCTTY |
288a74cc RC |
443 | * returning EPERM, i.e. when very likely we already |
444 | * are have this controlling terminal. */ | |
445 | if (r < 0 && r == -EPERM && ignore_tiocstty_eperm) | |
446 | r = 0; | |
447 | ||
7d927c9a | 448 | if (r < 0 && (force || fail || r != -EPERM)) |
288a74cc | 449 | goto fail; |
288a74cc RC |
450 | |
451 | if (r >= 0) | |
452 | break; | |
453 | ||
454 | assert(!fail); | |
455 | assert(!force); | |
456 | assert(notify >= 0); | |
457 | ||
458 | for (;;) { | |
459 | union inotify_event_buffer buffer; | |
460 | struct inotify_event *e; | |
461 | ssize_t l; | |
462 | ||
463 | if (timeout != USEC_INFINITY) { | |
464 | usec_t n; | |
465 | ||
466 | n = now(CLOCK_MONOTONIC); | |
467 | if (ts + timeout < n) { | |
468 | r = -ETIMEDOUT; | |
469 | goto fail; | |
470 | } | |
471 | ||
f80da6f3 | 472 | r = fd_wait_for_event(notify, POLLIN, ts + timeout - n); |
288a74cc RC |
473 | if (r < 0) |
474 | goto fail; | |
475 | ||
476 | if (r == 0) { | |
477 | r = -ETIMEDOUT; | |
478 | goto fail; | |
479 | } | |
480 | } | |
481 | ||
482 | l = read(notify, &buffer, sizeof(buffer)); | |
483 | if (l < 0) { | |
484 | if (errno == EINTR || errno == EAGAIN) | |
485 | continue; | |
486 | ||
487 | r = -errno; | |
488 | goto fail; | |
489 | } | |
490 | ||
491 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
492 | if (e->wd != wd || !(e->mask & IN_CLOSE)) { | |
493 | r = -EIO; | |
494 | goto fail; | |
495 | } | |
496 | } | |
497 | ||
498 | break; | |
499 | } | |
500 | ||
501 | /* We close the tty fd here since if the old session | |
502 | * ended our handle will be dead. It's important that | |
503 | * we do this after sleeping, so that we don't enter | |
504 | * an endless loop. */ | |
505 | fd = safe_close(fd); | |
506 | } | |
507 | ||
508 | safe_close(notify); | |
509 | ||
288a74cc RC |
510 | return fd; |
511 | ||
512 | fail: | |
513 | safe_close(fd); | |
514 | safe_close(notify); | |
515 | ||
516 | return r; | |
517 | } | |
518 | ||
519 | int release_terminal(void) { | |
520 | static const struct sigaction sa_new = { | |
521 | .sa_handler = SIG_IGN, | |
522 | .sa_flags = SA_RESTART, | |
523 | }; | |
524 | ||
525 | _cleanup_close_ int fd = -1; | |
526 | struct sigaction sa_old; | |
527 | int r = 0; | |
528 | ||
0a8b555c | 529 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
530 | if (fd < 0) |
531 | return -errno; | |
532 | ||
533 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
534 | * by our own TIOCNOTTY */ | |
535 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
536 | ||
537 | if (ioctl(fd, TIOCNOTTY) < 0) | |
538 | r = -errno; | |
539 | ||
540 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
541 | ||
542 | return r; | |
543 | } | |
544 | ||
545 | int terminal_vhangup_fd(int fd) { | |
546 | assert(fd >= 0); | |
547 | ||
548 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
549 | return -errno; | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
554 | int terminal_vhangup(const char *name) { | |
555 | _cleanup_close_ int fd; | |
556 | ||
0a8b555c | 557 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
558 | if (fd < 0) |
559 | return fd; | |
560 | ||
561 | return terminal_vhangup_fd(fd); | |
562 | } | |
563 | ||
564 | int vt_disallocate(const char *name) { | |
1ba23931 | 565 | _cleanup_close_ int fd = -1; |
27458ed6 | 566 | const char *e, *n; |
288a74cc | 567 | unsigned u; |
1ba23931 | 568 | int r; |
288a74cc RC |
569 | |
570 | /* Deallocate the VT if possible. If not possible | |
571 | * (i.e. because it is the active one), at least clear it | |
572 | * entirely (including the scrollback buffer) */ | |
573 | ||
27458ed6 LP |
574 | e = path_startswith(name, "/dev/"); |
575 | if (!e) | |
288a74cc RC |
576 | return -EINVAL; |
577 | ||
578 | if (!tty_is_vc(name)) { | |
579 | /* So this is not a VT. I guess we cannot deallocate | |
580 | * it then. But let's at least clear the screen */ | |
581 | ||
582 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
583 | if (fd < 0) | |
584 | return fd; | |
585 | ||
586 | loop_write(fd, | |
587 | "\033[r" /* clear scrolling region */ | |
588 | "\033[H" /* move home */ | |
589 | "\033[2J", /* clear screen */ | |
590 | 10, false); | |
288a74cc RC |
591 | return 0; |
592 | } | |
593 | ||
27458ed6 LP |
594 | n = startswith(e, "tty"); |
595 | if (!n) | |
288a74cc RC |
596 | return -EINVAL; |
597 | ||
27458ed6 | 598 | r = safe_atou(n, &u); |
288a74cc RC |
599 | if (r < 0) |
600 | return r; | |
601 | ||
602 | if (u <= 0) | |
603 | return -EINVAL; | |
604 | ||
605 | /* Try to deallocate */ | |
0a8b555c | 606 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
607 | if (fd < 0) |
608 | return fd; | |
609 | ||
610 | r = ioctl(fd, VT_DISALLOCATE, u); | |
1ba23931 | 611 | fd = safe_close(fd); |
288a74cc RC |
612 | |
613 | if (r >= 0) | |
614 | return 0; | |
615 | ||
616 | if (errno != EBUSY) | |
617 | return -errno; | |
618 | ||
619 | /* Couldn't deallocate, so let's clear it fully with | |
620 | * scrollback */ | |
621 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
622 | if (fd < 0) | |
623 | return fd; | |
624 | ||
625 | loop_write(fd, | |
626 | "\033[r" /* clear scrolling region */ | |
627 | "\033[H" /* move home */ | |
628 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
629 | 10, false); | |
288a74cc RC |
630 | return 0; |
631 | } | |
632 | ||
288a74cc RC |
633 | int make_console_stdio(void) { |
634 | int fd, r; | |
635 | ||
636 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr */ | |
637 | ||
638 | fd = acquire_terminal("/dev/console", false, true, true, USEC_INFINITY); | |
639 | if (fd < 0) | |
640 | return log_error_errno(fd, "Failed to acquire terminal: %m"); | |
641 | ||
3d18b167 LP |
642 | r = reset_terminal_fd(fd, true); |
643 | if (r < 0) | |
644 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
645 | ||
288a74cc RC |
646 | r = make_stdio(fd); |
647 | if (r < 0) | |
648 | return log_error_errno(r, "Failed to duplicate terminal fd: %m"); | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
288a74cc RC |
653 | bool tty_is_vc(const char *tty) { |
654 | assert(tty); | |
655 | ||
656 | return vtnr_from_tty(tty) >= 0; | |
657 | } | |
658 | ||
659 | bool tty_is_console(const char *tty) { | |
660 | assert(tty); | |
661 | ||
a119ec7c | 662 | return streq(skip_dev_prefix(tty), "console"); |
288a74cc RC |
663 | } |
664 | ||
665 | int vtnr_from_tty(const char *tty) { | |
666 | int i, r; | |
667 | ||
668 | assert(tty); | |
669 | ||
a119ec7c | 670 | tty = skip_dev_prefix(tty); |
288a74cc RC |
671 | |
672 | if (!startswith(tty, "tty") ) | |
673 | return -EINVAL; | |
674 | ||
675 | if (tty[3] < '0' || tty[3] > '9') | |
676 | return -EINVAL; | |
677 | ||
678 | r = safe_atoi(tty+3, &i); | |
679 | if (r < 0) | |
680 | return r; | |
681 | ||
682 | if (i < 0 || i > 63) | |
683 | return -EINVAL; | |
684 | ||
685 | return i; | |
686 | } | |
687 | ||
688 | char *resolve_dev_console(char **active) { | |
689 | char *tty; | |
690 | ||
691 | /* Resolve where /dev/console is pointing to, if /sys is actually ours | |
692 | * (i.e. not read-only-mounted which is a sign for container setups) */ | |
693 | ||
694 | if (path_is_read_only_fs("/sys") > 0) | |
695 | return NULL; | |
696 | ||
697 | if (read_one_line_file("/sys/class/tty/console/active", active) < 0) | |
698 | return NULL; | |
699 | ||
700 | /* If multiple log outputs are configured the last one is what | |
701 | * /dev/console points to */ | |
702 | tty = strrchr(*active, ' '); | |
703 | if (tty) | |
704 | tty++; | |
705 | else | |
706 | tty = *active; | |
707 | ||
708 | if (streq(tty, "tty0")) { | |
709 | char *tmp; | |
710 | ||
711 | /* Get the active VC (e.g. tty1) */ | |
712 | if (read_one_line_file("/sys/class/tty/tty0/active", &tmp) >= 0) { | |
713 | free(*active); | |
714 | tty = *active = tmp; | |
715 | } | |
716 | } | |
717 | ||
718 | return tty; | |
719 | } | |
720 | ||
6af62124 WF |
721 | int get_kernel_consoles(char ***consoles) { |
722 | _cleanup_strv_free_ char **con = NULL; | |
723 | _cleanup_free_ char *line = NULL; | |
724 | const char *active; | |
725 | int r; | |
726 | ||
727 | assert(consoles); | |
728 | ||
729 | r = read_one_line_file("/sys/class/tty/console/active", &line); | |
730 | if (r < 0) | |
731 | return r; | |
732 | ||
733 | active = line; | |
734 | for (;;) { | |
735 | _cleanup_free_ char *tty = NULL; | |
736 | char *path; | |
737 | ||
738 | r = extract_first_word(&active, &tty, NULL, 0); | |
739 | if (r < 0) | |
740 | return r; | |
741 | if (r == 0) | |
742 | break; | |
743 | ||
744 | if (streq(tty, "tty0")) { | |
745 | tty = mfree(tty); | |
746 | r = read_one_line_file("/sys/class/tty/tty0/active", &tty); | |
747 | if (r < 0) | |
748 | return r; | |
749 | } | |
750 | ||
751 | path = strappend("/dev/", tty); | |
752 | if (!path) | |
753 | return -ENOMEM; | |
754 | ||
755 | if (access(path, F_OK) < 0) { | |
756 | log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path); | |
757 | free(path); | |
758 | continue; | |
759 | } | |
760 | ||
761 | r = strv_consume(&con, path); | |
762 | if (r < 0) | |
763 | return r; | |
764 | } | |
765 | ||
766 | if (strv_isempty(con)) { | |
767 | log_debug("No devices found for system console"); | |
768 | ||
769 | r = strv_extend(&con, "/dev/console"); | |
770 | if (r < 0) | |
771 | return r; | |
772 | } | |
773 | ||
774 | *consoles = con; | |
775 | con = NULL; | |
776 | return 0; | |
777 | } | |
778 | ||
288a74cc RC |
779 | bool tty_is_vc_resolve(const char *tty) { |
780 | _cleanup_free_ char *active = NULL; | |
781 | ||
782 | assert(tty); | |
783 | ||
a119ec7c | 784 | tty = skip_dev_prefix(tty); |
288a74cc RC |
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) { | |
6af760f3 | 796 | return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220"; |
288a74cc RC |
797 | } |
798 | ||
799 | int fd_columns(int fd) { | |
800 | struct winsize ws = {}; | |
801 | ||
802 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
803 | return -errno; | |
804 | ||
805 | if (ws.ws_col <= 0) | |
806 | return -EIO; | |
807 | ||
808 | return ws.ws_col; | |
809 | } | |
810 | ||
811 | unsigned columns(void) { | |
812 | const char *e; | |
813 | int c; | |
814 | ||
815 | if (_likely_(cached_columns > 0)) | |
816 | return cached_columns; | |
817 | ||
818 | c = 0; | |
819 | e = getenv("COLUMNS"); | |
820 | if (e) | |
821 | (void) safe_atoi(e, &c); | |
822 | ||
823 | if (c <= 0) | |
824 | c = fd_columns(STDOUT_FILENO); | |
825 | ||
826 | if (c <= 0) | |
827 | c = 80; | |
828 | ||
829 | cached_columns = c; | |
830 | return cached_columns; | |
831 | } | |
832 | ||
833 | int fd_lines(int fd) { | |
834 | struct winsize ws = {}; | |
835 | ||
836 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
837 | return -errno; | |
838 | ||
839 | if (ws.ws_row <= 0) | |
840 | return -EIO; | |
841 | ||
842 | return ws.ws_row; | |
843 | } | |
844 | ||
845 | unsigned lines(void) { | |
846 | const char *e; | |
847 | int l; | |
848 | ||
849 | if (_likely_(cached_lines > 0)) | |
850 | return cached_lines; | |
851 | ||
852 | l = 0; | |
853 | e = getenv("LINES"); | |
854 | if (e) | |
855 | (void) safe_atoi(e, &l); | |
856 | ||
857 | if (l <= 0) | |
858 | l = fd_lines(STDOUT_FILENO); | |
859 | ||
860 | if (l <= 0) | |
861 | l = 24; | |
862 | ||
863 | cached_lines = l; | |
864 | return cached_lines; | |
865 | } | |
866 | ||
867 | /* intended to be used as a SIGWINCH sighandler */ | |
868 | void columns_lines_cache_reset(int signum) { | |
869 | cached_columns = 0; | |
870 | cached_lines = 0; | |
871 | } | |
872 | ||
873 | bool on_tty(void) { | |
874 | static int cached_on_tty = -1; | |
875 | ||
876 | if (_unlikely_(cached_on_tty < 0)) | |
877 | cached_on_tty = isatty(STDOUT_FILENO) > 0; | |
878 | ||
879 | return cached_on_tty; | |
880 | } | |
881 | ||
882 | int make_stdio(int fd) { | |
883 | int r, s, t; | |
884 | ||
885 | assert(fd >= 0); | |
886 | ||
887 | r = dup2(fd, STDIN_FILENO); | |
888 | s = dup2(fd, STDOUT_FILENO); | |
889 | t = dup2(fd, STDERR_FILENO); | |
890 | ||
891 | if (fd >= 3) | |
892 | safe_close(fd); | |
893 | ||
894 | if (r < 0 || s < 0 || t < 0) | |
895 | return -errno; | |
896 | ||
897 | /* Explicitly unset O_CLOEXEC, since if fd was < 3, then | |
898 | * dup2() was a NOP and the bit hence possibly set. */ | |
913f38e4 | 899 | stdio_unset_cloexec(); |
288a74cc RC |
900 | |
901 | return 0; | |
902 | } | |
903 | ||
904 | int make_null_stdio(void) { | |
905 | int null_fd; | |
906 | ||
907 | null_fd = open("/dev/null", O_RDWR|O_NOCTTY); | |
908 | if (null_fd < 0) | |
909 | return -errno; | |
910 | ||
911 | return make_stdio(null_fd); | |
912 | } | |
913 | ||
914 | int getttyname_malloc(int fd, char **ret) { | |
915 | size_t l = 100; | |
916 | int r; | |
917 | ||
918 | assert(fd >= 0); | |
919 | assert(ret); | |
920 | ||
921 | for (;;) { | |
922 | char path[l]; | |
923 | ||
924 | r = ttyname_r(fd, path, sizeof(path)); | |
925 | if (r == 0) { | |
288a74cc RC |
926 | char *c; |
927 | ||
a119ec7c | 928 | c = strdup(skip_dev_prefix(path)); |
288a74cc RC |
929 | if (!c) |
930 | return -ENOMEM; | |
931 | ||
932 | *ret = c; | |
933 | return 0; | |
934 | } | |
935 | ||
936 | if (r != ERANGE) | |
937 | return -r; | |
938 | ||
939 | l *= 2; | |
940 | } | |
941 | ||
942 | return 0; | |
943 | } | |
944 | ||
945 | int getttyname_harder(int fd, char **r) { | |
946 | int k; | |
947 | char *s = NULL; | |
948 | ||
949 | k = getttyname_malloc(fd, &s); | |
950 | if (k < 0) | |
951 | return k; | |
952 | ||
953 | if (streq(s, "tty")) { | |
954 | free(s); | |
955 | return get_ctty(0, NULL, r); | |
956 | } | |
957 | ||
958 | *r = s; | |
959 | return 0; | |
960 | } | |
961 | ||
962 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
963 | int r; | |
964 | _cleanup_free_ char *line = NULL; | |
965 | const char *p; | |
966 | unsigned long ttynr; | |
967 | ||
968 | assert(pid >= 0); | |
969 | ||
970 | p = procfs_file_alloca(pid, "stat"); | |
971 | r = read_one_line_file(p, &line); | |
972 | if (r < 0) | |
973 | return r; | |
974 | ||
975 | p = strrchr(line, ')'); | |
976 | if (!p) | |
977 | return -EIO; | |
978 | ||
979 | p++; | |
980 | ||
981 | if (sscanf(p, " " | |
982 | "%*c " /* state */ | |
983 | "%*d " /* ppid */ | |
984 | "%*d " /* pgrp */ | |
985 | "%*d " /* session */ | |
986 | "%lu ", /* ttynr */ | |
987 | &ttynr) != 1) | |
988 | return -EIO; | |
989 | ||
990 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
cfeaa44a | 991 | return -ENXIO; |
288a74cc RC |
992 | |
993 | if (d) | |
994 | *d = (dev_t) ttynr; | |
995 | ||
996 | return 0; | |
997 | } | |
998 | ||
999 | int get_ctty(pid_t pid, dev_t *_devnr, char **r) { | |
1000 | char fn[sizeof("/dev/char/")-1 + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL; | |
1001 | _cleanup_free_ char *s = NULL; | |
1002 | const char *p; | |
1003 | dev_t devnr; | |
1004 | int k; | |
1005 | ||
1006 | assert(r); | |
1007 | ||
1008 | k = get_ctty_devnr(pid, &devnr); | |
1009 | if (k < 0) | |
1010 | return k; | |
1011 | ||
1012 | sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr)); | |
1013 | ||
1014 | k = readlink_malloc(fn, &s); | |
1015 | if (k < 0) { | |
1016 | ||
1017 | if (k != -ENOENT) | |
1018 | return k; | |
1019 | ||
1020 | /* This is an ugly hack */ | |
1021 | if (major(devnr) == 136) { | |
1022 | if (asprintf(&b, "pts/%u", minor(devnr)) < 0) | |
1023 | return -ENOMEM; | |
1024 | } else { | |
1025 | /* Probably something like the ptys which have no | |
1026 | * symlink in /dev/char. Let's return something | |
1027 | * vaguely useful. */ | |
1028 | ||
1029 | b = strdup(fn + 5); | |
1030 | if (!b) | |
1031 | return -ENOMEM; | |
1032 | } | |
1033 | } else { | |
1034 | if (startswith(s, "/dev/")) | |
1035 | p = s + 5; | |
1036 | else if (startswith(s, "../")) | |
1037 | p = s + 3; | |
1038 | else | |
1039 | p = s; | |
1040 | ||
1041 | b = strdup(p); | |
1042 | if (!b) | |
1043 | return -ENOMEM; | |
1044 | } | |
1045 | ||
1046 | *r = b; | |
1047 | if (_devnr) | |
1048 | *_devnr = devnr; | |
1049 | ||
1050 | return 0; | |
1051 | } | |
a07c35c3 | 1052 | |
66cb2fde LP |
1053 | int ptsname_malloc(int fd, char **ret) { |
1054 | size_t l = 100; | |
1055 | ||
1056 | assert(fd >= 0); | |
1057 | assert(ret); | |
1058 | ||
1059 | for (;;) { | |
1060 | char *c; | |
1061 | ||
1062 | c = new(char, l); | |
1063 | if (!c) | |
1064 | return -ENOMEM; | |
1065 | ||
1066 | if (ptsname_r(fd, c, l) == 0) { | |
1067 | *ret = c; | |
1068 | return 0; | |
1069 | } | |
1070 | if (errno != ERANGE) { | |
1071 | free(c); | |
1072 | return -errno; | |
1073 | } | |
1074 | ||
1075 | free(c); | |
1076 | l *= 2; | |
1077 | } | |
1078 | } | |
1079 | ||
a07c35c3 LP |
1080 | int ptsname_namespace(int pty, char **ret) { |
1081 | int no = -1, r; | |
1082 | ||
1083 | /* Like ptsname(), but doesn't assume that the path is | |
1084 | * accessible in the local namespace. */ | |
1085 | ||
1086 | r = ioctl(pty, TIOCGPTN, &no); | |
1087 | if (r < 0) | |
1088 | return -errno; | |
1089 | ||
1090 | if (no < 0) | |
1091 | return -EIO; | |
1092 | ||
1093 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1094 | return -ENOMEM; | |
1095 | ||
1096 | return 0; | |
1097 | } | |
66cb2fde LP |
1098 | |
1099 | int openpt_in_namespace(pid_t pid, int flags) { | |
1100 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1101 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
1102 | siginfo_t si; | |
1103 | pid_t child; | |
1104 | int r; | |
1105 | ||
1106 | assert(pid > 0); | |
1107 | ||
1108 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1109 | if (r < 0) | |
1110 | return r; | |
1111 | ||
1112 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1113 | return -errno; | |
1114 | ||
1115 | child = fork(); | |
1116 | if (child < 0) | |
1117 | return -errno; | |
1118 | ||
1119 | if (child == 0) { | |
1120 | int master; | |
1121 | ||
1122 | pair[0] = safe_close(pair[0]); | |
1123 | ||
1124 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1125 | if (r < 0) | |
1126 | _exit(EXIT_FAILURE); | |
1127 | ||
1128 | master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); | |
1129 | if (master < 0) | |
1130 | _exit(EXIT_FAILURE); | |
1131 | ||
1132 | if (unlockpt(master) < 0) | |
1133 | _exit(EXIT_FAILURE); | |
1134 | ||
1135 | if (send_one_fd(pair[1], master, 0) < 0) | |
1136 | _exit(EXIT_FAILURE); | |
1137 | ||
1138 | _exit(EXIT_SUCCESS); | |
1139 | } | |
1140 | ||
1141 | pair[1] = safe_close(pair[1]); | |
1142 | ||
1143 | r = wait_for_terminate(child, &si); | |
1144 | if (r < 0) | |
1145 | return r; | |
1146 | if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS) | |
1147 | return -EIO; | |
1148 | ||
1149 | return receive_one_fd(pair[0], 0); | |
1150 | } | |
40e1f4ea LP |
1151 | |
1152 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
1153 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1154 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
1155 | siginfo_t si; | |
1156 | pid_t child; | |
1157 | int r; | |
1158 | ||
1159 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1160 | if (r < 0) | |
1161 | return r; | |
1162 | ||
1163 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1164 | return -errno; | |
1165 | ||
1166 | child = fork(); | |
1167 | if (child < 0) | |
1168 | return -errno; | |
1169 | ||
1170 | if (child == 0) { | |
1171 | int master; | |
1172 | ||
1173 | pair[0] = safe_close(pair[0]); | |
1174 | ||
1175 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1176 | if (r < 0) | |
1177 | _exit(EXIT_FAILURE); | |
1178 | ||
1179 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); | |
1180 | if (master < 0) | |
1181 | _exit(EXIT_FAILURE); | |
1182 | ||
1183 | if (send_one_fd(pair[1], master, 0) < 0) | |
1184 | _exit(EXIT_FAILURE); | |
1185 | ||
1186 | _exit(EXIT_SUCCESS); | |
1187 | } | |
1188 | ||
1189 | pair[1] = safe_close(pair[1]); | |
1190 | ||
1191 | r = wait_for_terminate(child, &si); | |
1192 | if (r < 0) | |
1193 | return r; | |
1194 | if (si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS) | |
1195 | return -EIO; | |
1196 | ||
1197 | return receive_one_fd(pair[0], 0); | |
1198 | } | |
40c9fe4c | 1199 | |
158fbf76 | 1200 | static bool getenv_terminal_is_dumb(void) { |
ac96418b LP |
1201 | const char *e; |
1202 | ||
ac96418b LP |
1203 | e = getenv("TERM"); |
1204 | if (!e) | |
1205 | return true; | |
1206 | ||
1207 | return streq(e, "dumb"); | |
1208 | } | |
1209 | ||
158fbf76 ZJS |
1210 | bool terminal_is_dumb(void) { |
1211 | if (!on_tty()) | |
1212 | return true; | |
1213 | ||
1214 | return getenv_terminal_is_dumb(); | |
1215 | } | |
1216 | ||
40c9fe4c | 1217 | bool colors_enabled(void) { |
ae5b3958 | 1218 | static int enabled = -1; |
40c9fe4c | 1219 | |
ae5b3958 | 1220 | if (_unlikely_(enabled < 0)) { |
acf553b0 | 1221 | int val; |
ae5b3958 | 1222 | |
acf553b0 ZJS |
1223 | val = getenv_bool("SYSTEMD_COLORS"); |
1224 | if (val >= 0) | |
1225 | enabled = val; | |
df0ff127 | 1226 | else if (getpid_cached() == 1) |
158fbf76 ZJS |
1227 | /* PID1 outputs to the console without holding it open all the time */ |
1228 | enabled = !getenv_terminal_is_dumb(); | |
ae5b3958 | 1229 | else |
ac96418b | 1230 | enabled = !terminal_is_dumb(); |
40c9fe4c JS |
1231 | } |
1232 | ||
ae5b3958 | 1233 | return enabled; |
40c9fe4c | 1234 | } |