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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
288a74cc | 2 | |
11c3a366 | 3 | #include <errno.h> |
07630cea | 4 | #include <fcntl.h> |
11c3a366 | 5 | #include <limits.h> |
23b27b39 LP |
6 | #include <linux/kd.h> |
7 | #include <linux/tiocl.h> | |
8 | #include <linux/vt.h> | |
9 | #include <poll.h> | |
10 | #include <signal.h> | |
11c3a366 TA |
11 | #include <stdarg.h> |
12 | #include <stddef.h> | |
13 | #include <stdlib.h> | |
14 | #include <string.h> | |
15 | #include <sys/inotify.h> | |
23b27b39 | 16 | #include <sys/ioctl.h> |
11c3a366 TA |
17 | #include <sys/socket.h> |
18 | #include <sys/sysmacros.h> | |
19 | #include <sys/time.h> | |
07630cea | 20 | #include <sys/types.h> |
23b27b39 | 21 | #include <sys/utsname.h> |
288a74cc | 22 | #include <termios.h> |
07630cea | 23 | #include <unistd.h> |
288a74cc | 24 | |
b5efdb8a | 25 | #include "alloc-util.h" |
81f5e513 | 26 | #include "copy.h" |
f8360f33 | 27 | #include "def.h" |
acf553b0 | 28 | #include "env-util.h" |
3ffd4af2 | 29 | #include "fd-util.h" |
288a74cc | 30 | #include "fileio.h" |
f4f15635 | 31 | #include "fs-util.h" |
c004493c | 32 | #include "io-util.h" |
93cc7779 TA |
33 | #include "log.h" |
34 | #include "macro.h" | |
6bedfcbb | 35 | #include "parse-util.h" |
c2b32159 LP |
36 | #include "path-util.h" |
37 | #include "proc-cmdline.h" | |
07630cea | 38 | #include "process-util.h" |
2583fbea | 39 | #include "socket-util.h" |
8fcde012 | 40 | #include "stat-util.h" |
07630cea | 41 | #include "string-util.h" |
6af62124 | 42 | #include "strv.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 | ||
c6063244 LP |
50 | static volatile int cached_on_tty = -1; |
51 | static volatile int cached_colors_enabled = -1; | |
52 | static volatile int cached_underline_enabled = -1; | |
53 | ||
288a74cc RC |
54 | int chvt(int vt) { |
55 | _cleanup_close_ int fd; | |
56 | ||
0295642d LP |
57 | /* Switch to the specified vt number. If the VT is specified <= 0 switch to the VT the kernel log messages go, |
58 | * if that's configured. */ | |
59 | ||
0a8b555c | 60 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
61 | if (fd < 0) |
62 | return -errno; | |
63 | ||
b9e74c39 | 64 | if (vt <= 0) { |
288a74cc RC |
65 | int tiocl[2] = { |
66 | TIOCL_GETKMSGREDIRECT, | |
67 | 0 | |
68 | }; | |
69 | ||
70 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
71 | return -errno; | |
72 | ||
73 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
74 | } | |
75 | ||
76 | if (ioctl(fd, VT_ACTIVATE, vt) < 0) | |
77 | return -errno; | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { | |
715bcf36 LP |
83 | _cleanup_free_ char *line = NULL; |
84 | struct termios old_termios; | |
85 | int r; | |
288a74cc RC |
86 | |
87 | assert(f); | |
88 | assert(ret); | |
89 | ||
715bcf36 | 90 | /* If this is a terminal, then switch canonical mode off, so that we can read a single character */ |
288a74cc | 91 | if (tcgetattr(fileno(f), &old_termios) >= 0) { |
715bcf36 | 92 | struct termios new_termios = old_termios; |
288a74cc RC |
93 | |
94 | new_termios.c_lflag &= ~ICANON; | |
95 | new_termios.c_cc[VMIN] = 1; | |
96 | new_termios.c_cc[VTIME] = 0; | |
97 | ||
98 | if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) { | |
03a7dbea | 99 | char c; |
288a74cc RC |
100 | |
101 | if (t != USEC_INFINITY) { | |
102 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) { | |
d3f9790c | 103 | (void) tcsetattr(fileno(f), TCSADRAIN, &old_termios); |
288a74cc RC |
104 | return -ETIMEDOUT; |
105 | } | |
106 | } | |
107 | ||
03a7dbea | 108 | r = safe_fgetc(f, &c); |
d3f9790c | 109 | (void) tcsetattr(fileno(f), TCSADRAIN, &old_termios); |
d3f9790c LP |
110 | if (r < 0) |
111 | return r; | |
03a7dbea LP |
112 | if (r == 0) |
113 | return -EIO; | |
288a74cc RC |
114 | |
115 | if (need_nl) | |
116 | *need_nl = c != '\n'; | |
117 | ||
118 | *ret = c; | |
119 | return 0; | |
120 | } | |
121 | } | |
122 | ||
123 | if (t != USEC_INFINITY) { | |
124 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) | |
125 | return -ETIMEDOUT; | |
126 | } | |
127 | ||
715bcf36 | 128 | /* If this is not a terminal, then read a full line instead */ |
288a74cc | 129 | |
715bcf36 LP |
130 | r = read_line(f, 16, &line); /* longer than necessary, to eat up UTF-8 chars/vt100 key sequences */ |
131 | if (r < 0) | |
132 | return r; | |
133 | if (r == 0) | |
134 | return -EIO; | |
288a74cc RC |
135 | |
136 | if (strlen(line) != 1) | |
137 | return -EBADMSG; | |
138 | ||
139 | if (need_nl) | |
140 | *need_nl = false; | |
141 | ||
142 | *ret = line[0]; | |
143 | return 0; | |
144 | } | |
145 | ||
3c670f89 FB |
146 | #define DEFAULT_ASK_REFRESH_USEC (2*USEC_PER_SEC) |
147 | ||
148 | int ask_char(char *ret, const char *replies, const char *fmt, ...) { | |
288a74cc RC |
149 | int r; |
150 | ||
151 | assert(ret); | |
152 | assert(replies); | |
3c670f89 | 153 | assert(fmt); |
288a74cc RC |
154 | |
155 | for (;;) { | |
156 | va_list ap; | |
157 | char c; | |
158 | bool need_nl = true; | |
159 | ||
7565bb98 | 160 | if (colors_enabled()) |
1fc464f6 | 161 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc | 162 | |
3c670f89 FB |
163 | putchar('\r'); |
164 | ||
165 | va_start(ap, fmt); | |
166 | vprintf(fmt, ap); | |
288a74cc RC |
167 | va_end(ap); |
168 | ||
7565bb98 | 169 | if (colors_enabled()) |
1fc464f6 | 170 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
171 | |
172 | fflush(stdout); | |
173 | ||
3c670f89 | 174 | r = read_one_char(stdin, &c, DEFAULT_ASK_REFRESH_USEC, &need_nl); |
288a74cc RC |
175 | if (r < 0) { |
176 | ||
3c670f89 FB |
177 | if (r == -ETIMEDOUT) |
178 | continue; | |
179 | ||
288a74cc RC |
180 | if (r == -EBADMSG) { |
181 | puts("Bad input, please try again."); | |
182 | continue; | |
183 | } | |
184 | ||
185 | putchar('\n'); | |
186 | return r; | |
187 | } | |
188 | ||
189 | if (need_nl) | |
190 | putchar('\n'); | |
191 | ||
192 | if (strchr(replies, c)) { | |
193 | *ret = c; | |
194 | return 0; | |
195 | } | |
196 | ||
197 | puts("Read unexpected character, please try again."); | |
198 | } | |
199 | } | |
200 | ||
201 | int ask_string(char **ret, const char *text, ...) { | |
715bcf36 LP |
202 | int r; |
203 | ||
288a74cc RC |
204 | assert(ret); |
205 | assert(text); | |
206 | ||
207 | for (;;) { | |
715bcf36 | 208 | _cleanup_free_ char *line = NULL; |
288a74cc RC |
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 | ||
715bcf36 LP |
223 | r = read_line(stdin, LONG_LINE_MAX, &line); |
224 | if (r < 0) | |
225 | return r; | |
226 | if (r == 0) | |
227 | return -EIO; | |
288a74cc | 228 | |
715bcf36 LP |
229 | if (!isempty(line)) { |
230 | *ret = TAKE_PTR(line); | |
288a74cc RC |
231 | return 0; |
232 | } | |
233 | } | |
234 | } | |
235 | ||
236 | int reset_terminal_fd(int fd, bool switch_to_text) { | |
237 | struct termios termios; | |
238 | int r = 0; | |
239 | ||
240 | /* Set terminal to some sane defaults */ | |
241 | ||
242 | assert(fd >= 0); | |
243 | ||
244 | /* We leave locked terminal attributes untouched, so that | |
245 | * Plymouth may set whatever it wants to set, and we don't | |
246 | * interfere with that. */ | |
247 | ||
248 | /* Disable exclusive mode, just in case */ | |
7d927c9a | 249 | (void) ioctl(fd, TIOCNXCL); |
288a74cc RC |
250 | |
251 | /* Switch to text mode */ | |
252 | if (switch_to_text) | |
7d927c9a | 253 | (void) ioctl(fd, KDSETMODE, KD_TEXT); |
288a74cc | 254 | |
73e669e0 | 255 | /* Set default keyboard mode */ |
c83f349c | 256 | (void) vt_reset_keyboard(fd); |
288a74cc RC |
257 | |
258 | if (tcgetattr(fd, &termios) < 0) { | |
259 | r = -errno; | |
260 | goto finish; | |
261 | } | |
262 | ||
263 | /* We only reset the stuff that matters to the software. How | |
264 | * hardware is set up we don't touch assuming that somebody | |
265 | * else will do that for us */ | |
266 | ||
267 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
268 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
269 | termios.c_oflag |= ONLCR; | |
270 | termios.c_cflag |= CREAD; | |
271 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
272 | ||
273 | termios.c_cc[VINTR] = 03; /* ^C */ | |
274 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
275 | termios.c_cc[VERASE] = 0177; | |
276 | termios.c_cc[VKILL] = 025; /* ^X */ | |
277 | termios.c_cc[VEOF] = 04; /* ^D */ | |
278 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
279 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
280 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
281 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
282 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
283 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
284 | termios.c_cc[VEOL] = 0; | |
285 | termios.c_cc[VEOL2] = 0; | |
286 | ||
287 | termios.c_cc[VTIME] = 0; | |
288 | termios.c_cc[VMIN] = 1; | |
289 | ||
290 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
291 | r = -errno; | |
292 | ||
293 | finish: | |
294 | /* Just in case, flush all crap out */ | |
7d927c9a | 295 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
296 | |
297 | return r; | |
298 | } | |
299 | ||
300 | int reset_terminal(const char *name) { | |
301 | _cleanup_close_ int fd = -1; | |
302 | ||
0a8b555c LP |
303 | /* We open the terminal with O_NONBLOCK here, to ensure we |
304 | * don't block on carrier if this is a terminal with carrier | |
305 | * configured. */ | |
306 | ||
307 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
308 | if (fd < 0) |
309 | return fd; | |
310 | ||
311 | return reset_terminal_fd(fd, true); | |
312 | } | |
313 | ||
314 | int open_terminal(const char *name, int mode) { | |
288a74cc | 315 | unsigned c = 0; |
87964ec7 | 316 | int fd; |
288a74cc RC |
317 | |
318 | /* | |
319 | * If a TTY is in the process of being closed opening it might | |
320 | * cause EIO. This is horribly awful, but unlikely to be | |
321 | * changed in the kernel. Hence we work around this problem by | |
322 | * retrying a couple of times. | |
323 | * | |
324 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
325 | */ | |
326 | ||
35bdab77 LP |
327 | if (mode & O_CREAT) |
328 | return -EINVAL; | |
288a74cc RC |
329 | |
330 | for (;;) { | |
331 | fd = open(name, mode, 0); | |
332 | if (fd >= 0) | |
333 | break; | |
334 | ||
335 | if (errno != EIO) | |
336 | return -errno; | |
337 | ||
338 | /* Max 1s in total */ | |
339 | if (c >= 20) | |
340 | return -errno; | |
341 | ||
342 | usleep(50 * USEC_PER_MSEC); | |
343 | c++; | |
344 | } | |
345 | ||
87964ec7 | 346 | if (isatty(fd) <= 0) { |
288a74cc RC |
347 | safe_close(fd); |
348 | return -ENOTTY; | |
349 | } | |
350 | ||
351 | return fd; | |
352 | } | |
353 | ||
354 | int acquire_terminal( | |
355 | const char *name, | |
8854d795 | 356 | AcquireTerminalFlags flags, |
288a74cc RC |
357 | usec_t timeout) { |
358 | ||
8854d795 LP |
359 | _cleanup_close_ int notify = -1, fd = -1; |
360 | usec_t ts = USEC_INFINITY; | |
361 | int r, wd = -1; | |
288a74cc RC |
362 | |
363 | assert(name); | |
8854d795 | 364 | assert(IN_SET(flags & ~ACQUIRE_TERMINAL_PERMISSIVE, ACQUIRE_TERMINAL_TRY, ACQUIRE_TERMINAL_FORCE, ACQUIRE_TERMINAL_WAIT)); |
288a74cc | 365 | |
8854d795 LP |
366 | /* We use inotify to be notified when the tty is closed. We create the watch before checking if we can actually |
367 | * acquire it, so that we don't lose any event. | |
288a74cc | 368 | * |
8854d795 LP |
369 | * Note: strictly speaking this actually watches for the device being closed, it does *not* really watch |
370 | * whether a tty loses its controlling process. However, unless some rogue process uses TIOCNOTTY on /dev/tty | |
f95dbcc2 ZJS |
371 | * *after* closing its tty otherwise this will not become a problem. As long as the administrator makes sure to |
372 | * not configure any service on the same tty as an untrusted user this should not be a problem. (Which they | |
8854d795 LP |
373 | * probably should not do anyway.) */ |
374 | ||
375 | if ((flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_WAIT) { | |
288a74cc | 376 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); |
8854d795 LP |
377 | if (notify < 0) |
378 | return -errno; | |
288a74cc RC |
379 | |
380 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
8854d795 LP |
381 | if (wd < 0) |
382 | return -errno; | |
383 | ||
384 | if (timeout != USEC_INFINITY) | |
385 | ts = now(CLOCK_MONOTONIC); | |
288a74cc RC |
386 | } |
387 | ||
388 | for (;;) { | |
389 | struct sigaction sa_old, sa_new = { | |
390 | .sa_handler = SIG_IGN, | |
391 | .sa_flags = SA_RESTART, | |
392 | }; | |
393 | ||
394 | if (notify >= 0) { | |
395 | r = flush_fd(notify); | |
396 | if (r < 0) | |
8854d795 | 397 | return r; |
288a74cc RC |
398 | } |
399 | ||
8854d795 LP |
400 | /* We pass here O_NOCTTY only so that we can check the return value TIOCSCTTY and have a reliable way |
401 | * to figure out if we successfully became the controlling process of the tty */ | |
288a74cc RC |
402 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); |
403 | if (fd < 0) | |
404 | return fd; | |
405 | ||
8854d795 | 406 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed if we already own the tty. */ |
288a74cc RC |
407 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); |
408 | ||
409 | /* First, try to get the tty */ | |
8854d795 LP |
410 | r = ioctl(fd, TIOCSCTTY, |
411 | (flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_FORCE) < 0 ? -errno : 0; | |
288a74cc | 412 | |
8854d795 | 413 | /* Reset signal handler to old value */ |
288a74cc RC |
414 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); |
415 | ||
8854d795 LP |
416 | /* Success? Exit the loop now! */ |
417 | if (r >= 0) | |
418 | break; | |
288a74cc | 419 | |
8854d795 LP |
420 | /* Any failure besides -EPERM? Fail, regardless of the mode. */ |
421 | if (r != -EPERM) | |
422 | return r; | |
288a74cc | 423 | |
8854d795 LP |
424 | if (flags & ACQUIRE_TERMINAL_PERMISSIVE) /* If we are in permissive mode, then EPERM is fine, turn this |
425 | * into a success. Note that EPERM is also returned if we | |
426 | * already are the owner of the TTY. */ | |
288a74cc RC |
427 | break; |
428 | ||
8854d795 LP |
429 | if (flags != ACQUIRE_TERMINAL_WAIT) /* If we are in TRY or FORCE mode, then propagate EPERM as EPERM */ |
430 | return r; | |
431 | ||
288a74cc | 432 | assert(notify >= 0); |
8854d795 | 433 | assert(wd >= 0); |
288a74cc RC |
434 | |
435 | for (;;) { | |
436 | union inotify_event_buffer buffer; | |
437 | struct inotify_event *e; | |
438 | ssize_t l; | |
439 | ||
440 | if (timeout != USEC_INFINITY) { | |
441 | usec_t n; | |
442 | ||
8854d795 LP |
443 | assert(ts != USEC_INFINITY); |
444 | ||
288a74cc | 445 | n = now(CLOCK_MONOTONIC); |
8854d795 LP |
446 | if (ts + timeout < n) |
447 | return -ETIMEDOUT; | |
288a74cc | 448 | |
f80da6f3 | 449 | r = fd_wait_for_event(notify, POLLIN, ts + timeout - n); |
288a74cc | 450 | if (r < 0) |
8854d795 LP |
451 | return r; |
452 | if (r == 0) | |
453 | return -ETIMEDOUT; | |
288a74cc RC |
454 | } |
455 | ||
456 | l = read(notify, &buffer, sizeof(buffer)); | |
457 | if (l < 0) { | |
3742095b | 458 | if (IN_SET(errno, EINTR, EAGAIN)) |
288a74cc RC |
459 | continue; |
460 | ||
8854d795 | 461 | return -errno; |
288a74cc RC |
462 | } |
463 | ||
464 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
8854d795 LP |
465 | if (e->mask & IN_Q_OVERFLOW) /* If we hit an inotify queue overflow, simply check if the terminal is up for grabs now. */ |
466 | break; | |
467 | ||
468 | if (e->wd != wd || !(e->mask & IN_CLOSE)) /* Safety checks */ | |
469 | return -EIO; | |
288a74cc RC |
470 | } |
471 | ||
472 | break; | |
473 | } | |
474 | ||
8854d795 LP |
475 | /* We close the tty fd here since if the old session ended our handle will be dead. It's important that |
476 | * we do this after sleeping, so that we don't enter an endless loop. */ | |
288a74cc RC |
477 | fd = safe_close(fd); |
478 | } | |
479 | ||
c10d6bdb | 480 | return TAKE_FD(fd); |
288a74cc RC |
481 | } |
482 | ||
483 | int release_terminal(void) { | |
484 | static const struct sigaction sa_new = { | |
485 | .sa_handler = SIG_IGN, | |
486 | .sa_flags = SA_RESTART, | |
487 | }; | |
488 | ||
489 | _cleanup_close_ int fd = -1; | |
490 | struct sigaction sa_old; | |
87964ec7 | 491 | int r; |
288a74cc | 492 | |
0a8b555c | 493 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
494 | if (fd < 0) |
495 | return -errno; | |
496 | ||
497 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
498 | * by our own TIOCNOTTY */ | |
499 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
500 | ||
87964ec7 | 501 | r = ioctl(fd, TIOCNOTTY) < 0 ? -errno : 0; |
288a74cc RC |
502 | |
503 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
504 | ||
505 | return r; | |
506 | } | |
507 | ||
508 | int terminal_vhangup_fd(int fd) { | |
509 | assert(fd >= 0); | |
510 | ||
511 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
512 | return -errno; | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | int terminal_vhangup(const char *name) { | |
518 | _cleanup_close_ int fd; | |
519 | ||
0a8b555c | 520 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
521 | if (fd < 0) |
522 | return fd; | |
523 | ||
524 | return terminal_vhangup_fd(fd); | |
525 | } | |
526 | ||
527 | int vt_disallocate(const char *name) { | |
1ba23931 | 528 | _cleanup_close_ int fd = -1; |
27458ed6 | 529 | const char *e, *n; |
288a74cc | 530 | unsigned u; |
1ba23931 | 531 | int r; |
288a74cc RC |
532 | |
533 | /* Deallocate the VT if possible. If not possible | |
534 | * (i.e. because it is the active one), at least clear it | |
535 | * entirely (including the scrollback buffer) */ | |
536 | ||
27458ed6 LP |
537 | e = path_startswith(name, "/dev/"); |
538 | if (!e) | |
288a74cc RC |
539 | return -EINVAL; |
540 | ||
541 | if (!tty_is_vc(name)) { | |
542 | /* So this is not a VT. I guess we cannot deallocate | |
543 | * it then. But let's at least clear the screen */ | |
544 | ||
545 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
546 | if (fd < 0) | |
547 | return fd; | |
548 | ||
549 | loop_write(fd, | |
550 | "\033[r" /* clear scrolling region */ | |
551 | "\033[H" /* move home */ | |
552 | "\033[2J", /* clear screen */ | |
553 | 10, false); | |
288a74cc RC |
554 | return 0; |
555 | } | |
556 | ||
27458ed6 LP |
557 | n = startswith(e, "tty"); |
558 | if (!n) | |
288a74cc RC |
559 | return -EINVAL; |
560 | ||
27458ed6 | 561 | r = safe_atou(n, &u); |
288a74cc RC |
562 | if (r < 0) |
563 | return r; | |
564 | ||
565 | if (u <= 0) | |
566 | return -EINVAL; | |
567 | ||
568 | /* Try to deallocate */ | |
0a8b555c | 569 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
570 | if (fd < 0) |
571 | return fd; | |
572 | ||
573 | r = ioctl(fd, VT_DISALLOCATE, u); | |
1ba23931 | 574 | fd = safe_close(fd); |
288a74cc RC |
575 | |
576 | if (r >= 0) | |
577 | return 0; | |
578 | ||
579 | if (errno != EBUSY) | |
580 | return -errno; | |
581 | ||
582 | /* Couldn't deallocate, so let's clear it fully with | |
583 | * scrollback */ | |
584 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
585 | if (fd < 0) | |
586 | return fd; | |
587 | ||
588 | loop_write(fd, | |
589 | "\033[r" /* clear scrolling region */ | |
590 | "\033[H" /* move home */ | |
591 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
592 | 10, false); | |
288a74cc RC |
593 | return 0; |
594 | } | |
595 | ||
288a74cc RC |
596 | int make_console_stdio(void) { |
597 | int fd, r; | |
598 | ||
599 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr */ | |
600 | ||
8854d795 | 601 | fd = acquire_terminal("/dev/console", ACQUIRE_TERMINAL_FORCE|ACQUIRE_TERMINAL_PERMISSIVE, USEC_INFINITY); |
288a74cc RC |
602 | if (fd < 0) |
603 | return log_error_errno(fd, "Failed to acquire terminal: %m"); | |
604 | ||
3d18b167 LP |
605 | r = reset_terminal_fd(fd, true); |
606 | if (r < 0) | |
607 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
608 | ||
8bb2db73 | 609 | r = rearrange_stdio(fd, fd, fd); /* This invalidates 'fd' both on success and on failure. */ |
288a74cc | 610 | if (r < 0) |
8bb2db73 | 611 | return log_error_errno(r, "Failed to make terminal stdin/stdout/stderr: %m"); |
288a74cc | 612 | |
c6063244 LP |
613 | reset_terminal_feature_caches(); |
614 | ||
288a74cc RC |
615 | return 0; |
616 | } | |
617 | ||
288a74cc RC |
618 | bool tty_is_vc(const char *tty) { |
619 | assert(tty); | |
620 | ||
621 | return vtnr_from_tty(tty) >= 0; | |
622 | } | |
623 | ||
624 | bool tty_is_console(const char *tty) { | |
625 | assert(tty); | |
626 | ||
a119ec7c | 627 | return streq(skip_dev_prefix(tty), "console"); |
288a74cc RC |
628 | } |
629 | ||
630 | int vtnr_from_tty(const char *tty) { | |
631 | int i, r; | |
632 | ||
633 | assert(tty); | |
634 | ||
a119ec7c | 635 | tty = skip_dev_prefix(tty); |
288a74cc RC |
636 | |
637 | if (!startswith(tty, "tty") ) | |
638 | return -EINVAL; | |
639 | ||
640 | if (tty[3] < '0' || tty[3] > '9') | |
641 | return -EINVAL; | |
642 | ||
643 | r = safe_atoi(tty+3, &i); | |
644 | if (r < 0) | |
645 | return r; | |
646 | ||
647 | if (i < 0 || i > 63) | |
648 | return -EINVAL; | |
649 | ||
650 | return i; | |
651 | } | |
652 | ||
7b912648 LP |
653 | int resolve_dev_console(char **ret) { |
654 | _cleanup_free_ char *active = NULL; | |
288a74cc | 655 | char *tty; |
7b912648 | 656 | int r; |
288a74cc | 657 | |
7b912648 LP |
658 | assert(ret); |
659 | ||
660 | /* Resolve where /dev/console is pointing to, if /sys is actually ours (i.e. not read-only-mounted which is a | |
661 | * sign for container setups) */ | |
288a74cc RC |
662 | |
663 | if (path_is_read_only_fs("/sys") > 0) | |
7b912648 | 664 | return -ENOMEDIUM; |
288a74cc | 665 | |
7b912648 LP |
666 | r = read_one_line_file("/sys/class/tty/console/active", &active); |
667 | if (r < 0) | |
668 | return r; | |
288a74cc | 669 | |
7b912648 LP |
670 | /* If multiple log outputs are configured the last one is what /dev/console points to */ |
671 | tty = strrchr(active, ' '); | |
288a74cc RC |
672 | if (tty) |
673 | tty++; | |
674 | else | |
7b912648 | 675 | tty = active; |
288a74cc RC |
676 | |
677 | if (streq(tty, "tty0")) { | |
7b912648 | 678 | active = mfree(active); |
288a74cc RC |
679 | |
680 | /* Get the active VC (e.g. tty1) */ | |
7b912648 LP |
681 | r = read_one_line_file("/sys/class/tty/tty0/active", &active); |
682 | if (r < 0) | |
683 | return r; | |
684 | ||
685 | tty = active; | |
686 | } | |
687 | ||
ae2a15bc LP |
688 | if (tty == active) |
689 | *ret = TAKE_PTR(active); | |
690 | else { | |
7b912648 LP |
691 | char *tmp; |
692 | ||
693 | tmp = strdup(tty); | |
694 | if (!tmp) | |
695 | return -ENOMEM; | |
696 | ||
697 | *ret = tmp; | |
288a74cc RC |
698 | } |
699 | ||
7b912648 | 700 | return 0; |
288a74cc RC |
701 | } |
702 | ||
bef41af2 LP |
703 | int get_kernel_consoles(char ***ret) { |
704 | _cleanup_strv_free_ char **l = NULL; | |
6af62124 | 705 | _cleanup_free_ char *line = NULL; |
bef41af2 | 706 | const char *p; |
6af62124 WF |
707 | int r; |
708 | ||
bef41af2 LP |
709 | assert(ret); |
710 | ||
f95dbcc2 | 711 | /* If /sys is mounted read-only this means we are running in some kind of container environment. In that |
bef41af2 LP |
712 | * case /sys would reflect the host system, not us, hence ignore the data we can read from it. */ |
713 | if (path_is_read_only_fs("/sys") > 0) | |
714 | goto fallback; | |
6af62124 WF |
715 | |
716 | r = read_one_line_file("/sys/class/tty/console/active", &line); | |
717 | if (r < 0) | |
718 | return r; | |
719 | ||
bef41af2 | 720 | p = line; |
6af62124 WF |
721 | for (;;) { |
722 | _cleanup_free_ char *tty = NULL; | |
723 | char *path; | |
724 | ||
bef41af2 | 725 | r = extract_first_word(&p, &tty, NULL, 0); |
6af62124 WF |
726 | if (r < 0) |
727 | return r; | |
728 | if (r == 0) | |
729 | break; | |
730 | ||
731 | if (streq(tty, "tty0")) { | |
732 | tty = mfree(tty); | |
733 | r = read_one_line_file("/sys/class/tty/tty0/active", &tty); | |
734 | if (r < 0) | |
735 | return r; | |
736 | } | |
737 | ||
738 | path = strappend("/dev/", tty); | |
739 | if (!path) | |
740 | return -ENOMEM; | |
741 | ||
742 | if (access(path, F_OK) < 0) { | |
743 | log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path); | |
744 | free(path); | |
745 | continue; | |
746 | } | |
747 | ||
bef41af2 | 748 | r = strv_consume(&l, path); |
6af62124 WF |
749 | if (r < 0) |
750 | return r; | |
751 | } | |
752 | ||
bef41af2 | 753 | if (strv_isempty(l)) { |
6af62124 | 754 | log_debug("No devices found for system console"); |
bef41af2 | 755 | goto fallback; |
6af62124 WF |
756 | } |
757 | ||
ae2a15bc | 758 | *ret = TAKE_PTR(l); |
bef41af2 LP |
759 | |
760 | return 0; | |
761 | ||
762 | fallback: | |
763 | r = strv_extend(&l, "/dev/console"); | |
764 | if (r < 0) | |
765 | return r; | |
766 | ||
ae2a15bc | 767 | *ret = TAKE_PTR(l); |
bef41af2 | 768 | |
6af62124 WF |
769 | return 0; |
770 | } | |
771 | ||
288a74cc | 772 | bool tty_is_vc_resolve(const char *tty) { |
7b912648 | 773 | _cleanup_free_ char *resolved = NULL; |
288a74cc RC |
774 | |
775 | assert(tty); | |
776 | ||
a119ec7c | 777 | tty = skip_dev_prefix(tty); |
288a74cc RC |
778 | |
779 | if (streq(tty, "console")) { | |
7b912648 | 780 | if (resolve_dev_console(&resolved) < 0) |
288a74cc | 781 | return false; |
7b912648 LP |
782 | |
783 | tty = resolved; | |
288a74cc RC |
784 | } |
785 | ||
786 | return tty_is_vc(tty); | |
787 | } | |
788 | ||
789 | const char *default_term_for_tty(const char *tty) { | |
6af760f3 | 790 | return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220"; |
288a74cc RC |
791 | } |
792 | ||
793 | int fd_columns(int fd) { | |
794 | struct winsize ws = {}; | |
795 | ||
796 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
797 | return -errno; | |
798 | ||
799 | if (ws.ws_col <= 0) | |
800 | return -EIO; | |
801 | ||
802 | return ws.ws_col; | |
803 | } | |
804 | ||
805 | unsigned columns(void) { | |
806 | const char *e; | |
807 | int c; | |
808 | ||
c6063244 | 809 | if (cached_columns > 0) |
288a74cc RC |
810 | return cached_columns; |
811 | ||
812 | c = 0; | |
813 | e = getenv("COLUMNS"); | |
814 | if (e) | |
815 | (void) safe_atoi(e, &c); | |
816 | ||
d09a7135 | 817 | if (c <= 0 || c > USHRT_MAX) { |
288a74cc | 818 | c = fd_columns(STDOUT_FILENO); |
d09a7135 LP |
819 | if (c <= 0) |
820 | c = 80; | |
821 | } | |
288a74cc RC |
822 | |
823 | cached_columns = c; | |
824 | return cached_columns; | |
825 | } | |
826 | ||
827 | int fd_lines(int fd) { | |
828 | struct winsize ws = {}; | |
829 | ||
830 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
831 | return -errno; | |
832 | ||
833 | if (ws.ws_row <= 0) | |
834 | return -EIO; | |
835 | ||
836 | return ws.ws_row; | |
837 | } | |
838 | ||
839 | unsigned lines(void) { | |
840 | const char *e; | |
841 | int l; | |
842 | ||
c6063244 | 843 | if (cached_lines > 0) |
288a74cc RC |
844 | return cached_lines; |
845 | ||
846 | l = 0; | |
847 | e = getenv("LINES"); | |
848 | if (e) | |
849 | (void) safe_atoi(e, &l); | |
850 | ||
d09a7135 | 851 | if (l <= 0 || l > USHRT_MAX) { |
288a74cc | 852 | l = fd_lines(STDOUT_FILENO); |
d09a7135 LP |
853 | if (l <= 0) |
854 | l = 24; | |
855 | } | |
288a74cc RC |
856 | |
857 | cached_lines = l; | |
858 | return cached_lines; | |
859 | } | |
860 | ||
861 | /* intended to be used as a SIGWINCH sighandler */ | |
862 | void columns_lines_cache_reset(int signum) { | |
863 | cached_columns = 0; | |
864 | cached_lines = 0; | |
865 | } | |
866 | ||
c6063244 LP |
867 | void reset_terminal_feature_caches(void) { |
868 | cached_columns = 0; | |
869 | cached_lines = 0; | |
870 | ||
871 | cached_colors_enabled = -1; | |
872 | cached_underline_enabled = -1; | |
873 | cached_on_tty = -1; | |
874 | } | |
288a74cc | 875 | |
c6063244 | 876 | bool on_tty(void) { |
8cd0356e LP |
877 | |
878 | /* We check both stdout and stderr, so that situations where pipes on the shell are used are reliably | |
879 | * recognized, regardless if only the output or the errors are piped to some place. Since on_tty() is generally | |
880 | * used to default to a safer, non-interactive, non-color mode of operation it's probably good to be defensive | |
881 | * here, and check for both. Note that we don't check for STDIN_FILENO, because it should fine to use fancy | |
882 | * terminal functionality when outputting stuff, even if the input is piped to us. */ | |
883 | ||
c6063244 | 884 | if (cached_on_tty < 0) |
8cd0356e LP |
885 | cached_on_tty = |
886 | isatty(STDOUT_FILENO) > 0 && | |
887 | isatty(STDERR_FILENO) > 0; | |
288a74cc RC |
888 | |
889 | return cached_on_tty; | |
890 | } | |
891 | ||
288a74cc RC |
892 | int getttyname_malloc(int fd, char **ret) { |
893 | size_t l = 100; | |
894 | int r; | |
895 | ||
896 | assert(fd >= 0); | |
897 | assert(ret); | |
898 | ||
899 | for (;;) { | |
900 | char path[l]; | |
901 | ||
902 | r = ttyname_r(fd, path, sizeof(path)); | |
903 | if (r == 0) { | |
288a74cc RC |
904 | char *c; |
905 | ||
a119ec7c | 906 | c = strdup(skip_dev_prefix(path)); |
288a74cc RC |
907 | if (!c) |
908 | return -ENOMEM; | |
909 | ||
910 | *ret = c; | |
911 | return 0; | |
912 | } | |
913 | ||
914 | if (r != ERANGE) | |
915 | return -r; | |
916 | ||
917 | l *= 2; | |
918 | } | |
919 | ||
920 | return 0; | |
921 | } | |
922 | ||
923 | int getttyname_harder(int fd, char **r) { | |
924 | int k; | |
925 | char *s = NULL; | |
926 | ||
927 | k = getttyname_malloc(fd, &s); | |
928 | if (k < 0) | |
929 | return k; | |
930 | ||
931 | if (streq(s, "tty")) { | |
932 | free(s); | |
933 | return get_ctty(0, NULL, r); | |
934 | } | |
935 | ||
936 | *r = s; | |
937 | return 0; | |
938 | } | |
939 | ||
940 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
941 | int r; | |
942 | _cleanup_free_ char *line = NULL; | |
943 | const char *p; | |
944 | unsigned long ttynr; | |
945 | ||
946 | assert(pid >= 0); | |
947 | ||
948 | p = procfs_file_alloca(pid, "stat"); | |
949 | r = read_one_line_file(p, &line); | |
950 | if (r < 0) | |
951 | return r; | |
952 | ||
953 | p = strrchr(line, ')'); | |
954 | if (!p) | |
955 | return -EIO; | |
956 | ||
957 | p++; | |
958 | ||
959 | if (sscanf(p, " " | |
960 | "%*c " /* state */ | |
961 | "%*d " /* ppid */ | |
962 | "%*d " /* pgrp */ | |
963 | "%*d " /* session */ | |
964 | "%lu ", /* ttynr */ | |
965 | &ttynr) != 1) | |
966 | return -EIO; | |
967 | ||
968 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
cfeaa44a | 969 | return -ENXIO; |
288a74cc RC |
970 | |
971 | if (d) | |
972 | *d = (dev_t) ttynr; | |
973 | ||
974 | return 0; | |
975 | } | |
976 | ||
54b22b26 LP |
977 | int get_ctty(pid_t pid, dev_t *ret_devnr, char **ret) { |
978 | _cleanup_free_ char *fn = NULL, *b = NULL; | |
288a74cc | 979 | dev_t devnr; |
54b22b26 | 980 | int r; |
288a74cc | 981 | |
54b22b26 LP |
982 | r = get_ctty_devnr(pid, &devnr); |
983 | if (r < 0) | |
984 | return r; | |
288a74cc | 985 | |
54b22b26 LP |
986 | r = device_path_make_canonical(S_IFCHR, devnr, &fn); |
987 | if (r < 0) { | |
988 | if (r != -ENOENT) /* No symlink for this in /dev/char/? */ | |
989 | return r; | |
288a74cc | 990 | |
288a74cc | 991 | if (major(devnr) == 136) { |
54b22b26 LP |
992 | /* This is an ugly hack: PTY devices are not listed in /dev/char/, as they don't follow the |
993 | * Linux device model. This means we have no nice way to match them up against their actual | |
994 | * device node. Let's hence do the check by the fixed, assigned major number. Normally we try | |
995 | * to avoid such fixed major/minor matches, but there appears to nother nice way to handle | |
996 | * this. */ | |
997 | ||
288a74cc RC |
998 | if (asprintf(&b, "pts/%u", minor(devnr)) < 0) |
999 | return -ENOMEM; | |
1000 | } else { | |
54b22b26 LP |
1001 | /* Probably something similar to the ptys which have no symlink in /dev/char/. Let's return |
1002 | * something vaguely useful. */ | |
288a74cc | 1003 | |
54b22b26 LP |
1004 | r = device_path_make_major_minor(S_IFCHR, devnr, &fn); |
1005 | if (r < 0) | |
1006 | return r; | |
288a74cc | 1007 | } |
54b22b26 | 1008 | } |
288a74cc | 1009 | |
54b22b26 LP |
1010 | if (!b) { |
1011 | const char *w; | |
1012 | ||
1013 | w = path_startswith(fn, "/dev/"); | |
1014 | if (w) { | |
1015 | b = strdup(w); | |
1016 | if (!b) | |
1017 | return -ENOMEM; | |
1018 | } else | |
1019 | b = TAKE_PTR(fn); | |
288a74cc RC |
1020 | } |
1021 | ||
54b22b26 LP |
1022 | if (ret) |
1023 | *ret = TAKE_PTR(b); | |
1024 | ||
1025 | if (ret_devnr) | |
1026 | *ret_devnr = devnr; | |
288a74cc RC |
1027 | |
1028 | return 0; | |
1029 | } | |
a07c35c3 | 1030 | |
66cb2fde LP |
1031 | int ptsname_malloc(int fd, char **ret) { |
1032 | size_t l = 100; | |
1033 | ||
1034 | assert(fd >= 0); | |
1035 | assert(ret); | |
1036 | ||
1037 | for (;;) { | |
1038 | char *c; | |
1039 | ||
1040 | c = new(char, l); | |
1041 | if (!c) | |
1042 | return -ENOMEM; | |
1043 | ||
1044 | if (ptsname_r(fd, c, l) == 0) { | |
1045 | *ret = c; | |
1046 | return 0; | |
1047 | } | |
1048 | if (errno != ERANGE) { | |
1049 | free(c); | |
1050 | return -errno; | |
1051 | } | |
1052 | ||
1053 | free(c); | |
1054 | l *= 2; | |
1055 | } | |
1056 | } | |
1057 | ||
a07c35c3 LP |
1058 | int ptsname_namespace(int pty, char **ret) { |
1059 | int no = -1, r; | |
1060 | ||
1061 | /* Like ptsname(), but doesn't assume that the path is | |
1062 | * accessible in the local namespace. */ | |
1063 | ||
1064 | r = ioctl(pty, TIOCGPTN, &no); | |
1065 | if (r < 0) | |
1066 | return -errno; | |
1067 | ||
1068 | if (no < 0) | |
1069 | return -EIO; | |
1070 | ||
1071 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1072 | return -ENOMEM; | |
1073 | ||
1074 | return 0; | |
1075 | } | |
66cb2fde LP |
1076 | |
1077 | int openpt_in_namespace(pid_t pid, int flags) { | |
1078 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1079 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
66cb2fde LP |
1080 | pid_t child; |
1081 | int r; | |
1082 | ||
1083 | assert(pid > 0); | |
1084 | ||
1085 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1086 | if (r < 0) | |
1087 | return r; | |
1088 | ||
1089 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1090 | return -errno; | |
1091 | ||
1edcb6a9 LP |
1092 | r = namespace_fork("(sd-openptns)", "(sd-openpt)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG, |
1093 | pidnsfd, mntnsfd, -1, usernsfd, rootfd, &child); | |
4c253ed1 LP |
1094 | if (r < 0) |
1095 | return r; | |
1096 | if (r == 0) { | |
66cb2fde LP |
1097 | int master; |
1098 | ||
1099 | pair[0] = safe_close(pair[0]); | |
1100 | ||
66cb2fde LP |
1101 | master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); |
1102 | if (master < 0) | |
1103 | _exit(EXIT_FAILURE); | |
1104 | ||
1105 | if (unlockpt(master) < 0) | |
1106 | _exit(EXIT_FAILURE); | |
1107 | ||
1108 | if (send_one_fd(pair[1], master, 0) < 0) | |
1109 | _exit(EXIT_FAILURE); | |
1110 | ||
1111 | _exit(EXIT_SUCCESS); | |
1112 | } | |
1113 | ||
1114 | pair[1] = safe_close(pair[1]); | |
1115 | ||
1edcb6a9 | 1116 | r = wait_for_terminate_and_check("(sd-openptns)", child, 0); |
66cb2fde LP |
1117 | if (r < 0) |
1118 | return r; | |
2e87a1fd | 1119 | if (r != EXIT_SUCCESS) |
66cb2fde LP |
1120 | return -EIO; |
1121 | ||
1122 | return receive_one_fd(pair[0], 0); | |
1123 | } | |
40e1f4ea LP |
1124 | |
1125 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
1126 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1127 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
40e1f4ea LP |
1128 | pid_t child; |
1129 | int r; | |
1130 | ||
1131 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1132 | if (r < 0) | |
1133 | return r; | |
1134 | ||
1135 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1136 | return -errno; | |
1137 | ||
1edcb6a9 LP |
1138 | r = namespace_fork("(sd-terminalns)", "(sd-terminal)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG, |
1139 | pidnsfd, mntnsfd, -1, usernsfd, rootfd, &child); | |
4c253ed1 LP |
1140 | if (r < 0) |
1141 | return r; | |
1142 | if (r == 0) { | |
40e1f4ea LP |
1143 | int master; |
1144 | ||
1145 | pair[0] = safe_close(pair[0]); | |
1146 | ||
40e1f4ea LP |
1147 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); |
1148 | if (master < 0) | |
1149 | _exit(EXIT_FAILURE); | |
1150 | ||
1151 | if (send_one_fd(pair[1], master, 0) < 0) | |
1152 | _exit(EXIT_FAILURE); | |
1153 | ||
1154 | _exit(EXIT_SUCCESS); | |
1155 | } | |
1156 | ||
1157 | pair[1] = safe_close(pair[1]); | |
1158 | ||
1edcb6a9 | 1159 | r = wait_for_terminate_and_check("(sd-terminalns)", child, 0); |
40e1f4ea LP |
1160 | if (r < 0) |
1161 | return r; | |
2e87a1fd | 1162 | if (r != EXIT_SUCCESS) |
40e1f4ea LP |
1163 | return -EIO; |
1164 | ||
1165 | return receive_one_fd(pair[0], 0); | |
1166 | } | |
40c9fe4c | 1167 | |
158fbf76 | 1168 | static bool getenv_terminal_is_dumb(void) { |
ac96418b LP |
1169 | const char *e; |
1170 | ||
ac96418b LP |
1171 | e = getenv("TERM"); |
1172 | if (!e) | |
1173 | return true; | |
1174 | ||
1175 | return streq(e, "dumb"); | |
1176 | } | |
1177 | ||
158fbf76 ZJS |
1178 | bool terminal_is_dumb(void) { |
1179 | if (!on_tty()) | |
1180 | return true; | |
1181 | ||
1182 | return getenv_terminal_is_dumb(); | |
1183 | } | |
1184 | ||
40c9fe4c | 1185 | bool colors_enabled(void) { |
40c9fe4c | 1186 | |
0295642d | 1187 | /* Returns true if colors are considered supported on our stdout. For that we check $SYSTEMD_COLORS first |
f95dbcc2 | 1188 | * (which is the explicit way to turn colors on/off). If that didn't work we turn colors off unless we are on a |
0295642d LP |
1189 | * TTY. And if we are on a TTY we turn it off if $TERM is set to "dumb". There's one special tweak though: if |
1190 | * we are PID 1 then we do not check whether we are connected to a TTY, because we don't keep /dev/console open | |
1191 | * continously due to fear of SAK, and hence things are a bit weird. */ | |
1192 | ||
c6063244 | 1193 | if (cached_colors_enabled < 0) { |
acf553b0 | 1194 | int val; |
ae5b3958 | 1195 | |
acf553b0 ZJS |
1196 | val = getenv_bool("SYSTEMD_COLORS"); |
1197 | if (val >= 0) | |
c6063244 | 1198 | cached_colors_enabled = val; |
df0ff127 | 1199 | else if (getpid_cached() == 1) |
158fbf76 | 1200 | /* PID1 outputs to the console without holding it open all the time */ |
c6063244 | 1201 | cached_colors_enabled = !getenv_terminal_is_dumb(); |
ae5b3958 | 1202 | else |
c6063244 | 1203 | cached_colors_enabled = !terminal_is_dumb(); |
40c9fe4c JS |
1204 | } |
1205 | ||
c6063244 | 1206 | return cached_colors_enabled; |
40c9fe4c | 1207 | } |
c83f349c | 1208 | |
c2b32159 LP |
1209 | bool dev_console_colors_enabled(void) { |
1210 | _cleanup_free_ char *s = NULL; | |
1211 | int b; | |
1212 | ||
1213 | /* Returns true if we assume that color is supported on /dev/console. | |
1214 | * | |
1215 | * For that we first check if we explicitly got told to use colors or not, by checking $SYSTEMD_COLORS. If that | |
f95dbcc2 ZJS |
1216 | * isn't set we check whether PID 1 has $TERM set, and if not, whether TERM is set on the kernel command |
1217 | * line. If we find $TERM set we assume color if it's not set to "dumb", similarly to how regular | |
c2b32159 LP |
1218 | * colors_enabled() operates. */ |
1219 | ||
1220 | b = getenv_bool("SYSTEMD_COLORS"); | |
1221 | if (b >= 0) | |
1222 | return b; | |
1223 | ||
1224 | if (getenv_for_pid(1, "TERM", &s) <= 0) | |
1225 | (void) proc_cmdline_get_key("TERM", 0, &s); | |
1226 | ||
1227 | return !streq_ptr(s, "dumb"); | |
1228 | } | |
1229 | ||
526664f6 | 1230 | bool underline_enabled(void) { |
526664f6 | 1231 | |
c6063244 | 1232 | if (cached_underline_enabled < 0) { |
526664f6 LP |
1233 | |
1234 | /* The Linux console doesn't support underlining, turn it off, but only there. */ | |
1235 | ||
c6063244 LP |
1236 | if (colors_enabled()) |
1237 | cached_underline_enabled = !streq_ptr(getenv("TERM"), "linux"); | |
526664f6 | 1238 | else |
c6063244 | 1239 | cached_underline_enabled = false; |
526664f6 LP |
1240 | } |
1241 | ||
c6063244 | 1242 | return cached_underline_enabled; |
526664f6 LP |
1243 | } |
1244 | ||
c83f349c LP |
1245 | int vt_default_utf8(void) { |
1246 | _cleanup_free_ char *b = NULL; | |
1247 | int r; | |
1248 | ||
1249 | /* Read the default VT UTF8 setting from the kernel */ | |
1250 | ||
1251 | r = read_one_line_file("/sys/module/vt/parameters/default_utf8", &b); | |
1252 | if (r < 0) | |
1253 | return r; | |
1254 | ||
1255 | return parse_boolean(b); | |
1256 | } | |
1257 | ||
1258 | int vt_reset_keyboard(int fd) { | |
1259 | int kb; | |
1260 | ||
1261 | /* If we can't read the default, then default to unicode. It's 2017 after all. */ | |
1262 | kb = vt_default_utf8() != 0 ? K_UNICODE : K_XLATE; | |
1263 | ||
1264 | if (ioctl(fd, KDSKBMODE, kb) < 0) | |
1265 | return -errno; | |
1266 | ||
1267 | return 0; | |
1268 | } | |
6179ede1 FB |
1269 | |
1270 | int vt_restore(int fd) { | |
1271 | static const struct vt_mode mode = { | |
1272 | .mode = VT_AUTO, | |
1273 | }; | |
1274 | int r, q = 0; | |
1275 | ||
1276 | r = ioctl(fd, KDSETMODE, KD_TEXT); | |
1277 | if (r < 0) | |
1278 | q = log_debug_errno(errno, "Failed to set VT in text mode, ignoring: %m"); | |
1279 | ||
1280 | r = vt_reset_keyboard(fd); | |
1281 | if (r < 0) { | |
1282 | log_debug_errno(r, "Failed to reset keyboard mode, ignoring: %m"); | |
1283 | if (q >= 0) | |
1284 | q = r; | |
1285 | } | |
1286 | ||
1287 | r = ioctl(fd, VT_SETMODE, &mode); | |
1288 | if (r < 0) { | |
1289 | log_debug_errno(errno, "Failed to set VT_AUTO mode, ignoring: %m"); | |
1290 | if (q >= 0) | |
1291 | q = -errno; | |
1292 | } | |
1293 | ||
1294 | r = fchown(fd, 0, (gid_t) -1); | |
1295 | if (r < 0) { | |
1296 | log_debug_errno(errno, "Failed to chown VT, ignoring: %m"); | |
1297 | if (q >= 0) | |
1298 | q = -errno; | |
1299 | } | |
1300 | ||
1301 | return q; | |
1302 | } | |
27dafac9 FB |
1303 | |
1304 | int vt_release(int fd, bool restore) { | |
1305 | assert(fd >= 0); | |
1306 | ||
1307 | /* This function releases the VT by acknowledging the VT-switch signal | |
1308 | * sent by the kernel and optionally reset the VT in text and auto | |
1309 | * VT-switching modes. */ | |
1310 | ||
1311 | if (ioctl(fd, VT_RELDISP, 1) < 0) | |
1312 | return -errno; | |
1313 | ||
1314 | if (restore) | |
1315 | return vt_restore(fd); | |
1316 | ||
1317 | return 0; | |
1318 | } |