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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
288a74cc RC |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
288a74cc RC |
6 | ***/ |
7 | ||
11c3a366 | 8 | #include <errno.h> |
07630cea | 9 | #include <fcntl.h> |
11c3a366 | 10 | #include <limits.h> |
23b27b39 LP |
11 | #include <linux/kd.h> |
12 | #include <linux/tiocl.h> | |
13 | #include <linux/vt.h> | |
14 | #include <poll.h> | |
15 | #include <signal.h> | |
11c3a366 TA |
16 | #include <stdarg.h> |
17 | #include <stddef.h> | |
18 | #include <stdlib.h> | |
19 | #include <string.h> | |
20 | #include <sys/inotify.h> | |
23b27b39 | 21 | #include <sys/ioctl.h> |
11c3a366 TA |
22 | #include <sys/socket.h> |
23 | #include <sys/sysmacros.h> | |
24 | #include <sys/time.h> | |
07630cea | 25 | #include <sys/types.h> |
23b27b39 | 26 | #include <sys/utsname.h> |
288a74cc | 27 | #include <termios.h> |
07630cea | 28 | #include <unistd.h> |
288a74cc | 29 | |
b5efdb8a | 30 | #include "alloc-util.h" |
81f5e513 | 31 | #include "copy.h" |
f8360f33 | 32 | #include "def.h" |
acf553b0 | 33 | #include "env-util.h" |
3ffd4af2 | 34 | #include "fd-util.h" |
288a74cc | 35 | #include "fileio.h" |
f4f15635 | 36 | #include "fs-util.h" |
c004493c | 37 | #include "io-util.h" |
93cc7779 TA |
38 | #include "log.h" |
39 | #include "macro.h" | |
23b27b39 | 40 | #include "pager.h" |
6bedfcbb | 41 | #include "parse-util.h" |
c2b32159 LP |
42 | #include "path-util.h" |
43 | #include "proc-cmdline.h" | |
07630cea | 44 | #include "process-util.h" |
2583fbea | 45 | #include "socket-util.h" |
8fcde012 | 46 | #include "stat-util.h" |
07630cea | 47 | #include "string-util.h" |
6af62124 | 48 | #include "strv.h" |
3ffd4af2 | 49 | #include "terminal-util.h" |
07630cea LP |
50 | #include "time-util.h" |
51 | #include "util.h" | |
288a74cc RC |
52 | |
53 | static volatile unsigned cached_columns = 0; | |
54 | static volatile unsigned cached_lines = 0; | |
55 | ||
c6063244 LP |
56 | static volatile int cached_on_tty = -1; |
57 | static volatile int cached_colors_enabled = -1; | |
58 | static volatile int cached_underline_enabled = -1; | |
59 | ||
288a74cc RC |
60 | int chvt(int vt) { |
61 | _cleanup_close_ int fd; | |
62 | ||
0295642d LP |
63 | /* Switch to the specified vt number. If the VT is specified <= 0 switch to the VT the kernel log messages go, |
64 | * if that's configured. */ | |
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; | |
248 | int r = 0; | |
249 | ||
250 | /* Set terminal to some sane defaults */ | |
251 | ||
252 | assert(fd >= 0); | |
253 | ||
254 | /* We leave locked terminal attributes untouched, so that | |
255 | * Plymouth may set whatever it wants to set, and we don't | |
256 | * interfere with that. */ | |
257 | ||
258 | /* Disable exclusive mode, just in case */ | |
7d927c9a | 259 | (void) ioctl(fd, TIOCNXCL); |
288a74cc RC |
260 | |
261 | /* Switch to text mode */ | |
262 | if (switch_to_text) | |
7d927c9a | 263 | (void) ioctl(fd, KDSETMODE, KD_TEXT); |
288a74cc | 264 | |
73e669e0 | 265 | /* Set default keyboard mode */ |
c83f349c | 266 | (void) vt_reset_keyboard(fd); |
288a74cc RC |
267 | |
268 | if (tcgetattr(fd, &termios) < 0) { | |
269 | r = -errno; | |
270 | goto finish; | |
271 | } | |
272 | ||
273 | /* We only reset the stuff that matters to the software. How | |
274 | * hardware is set up we don't touch assuming that somebody | |
275 | * else will do that for us */ | |
276 | ||
277 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
278 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
279 | termios.c_oflag |= ONLCR; | |
280 | termios.c_cflag |= CREAD; | |
281 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
282 | ||
283 | termios.c_cc[VINTR] = 03; /* ^C */ | |
284 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
285 | termios.c_cc[VERASE] = 0177; | |
286 | termios.c_cc[VKILL] = 025; /* ^X */ | |
287 | termios.c_cc[VEOF] = 04; /* ^D */ | |
288 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
289 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
290 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
291 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
292 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
293 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
294 | termios.c_cc[VEOL] = 0; | |
295 | termios.c_cc[VEOL2] = 0; | |
296 | ||
297 | termios.c_cc[VTIME] = 0; | |
298 | termios.c_cc[VMIN] = 1; | |
299 | ||
300 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
301 | r = -errno; | |
302 | ||
303 | finish: | |
304 | /* Just in case, flush all crap out */ | |
7d927c9a | 305 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
306 | |
307 | return r; | |
308 | } | |
309 | ||
310 | int reset_terminal(const char *name) { | |
311 | _cleanup_close_ int fd = -1; | |
312 | ||
0a8b555c LP |
313 | /* We open the terminal with O_NONBLOCK here, to ensure we |
314 | * don't block on carrier if this is a terminal with carrier | |
315 | * configured. */ | |
316 | ||
317 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
318 | if (fd < 0) |
319 | return fd; | |
320 | ||
321 | return reset_terminal_fd(fd, true); | |
322 | } | |
323 | ||
324 | int open_terminal(const char *name, int mode) { | |
288a74cc | 325 | unsigned c = 0; |
87964ec7 | 326 | int fd; |
288a74cc RC |
327 | |
328 | /* | |
329 | * If a TTY is in the process of being closed opening it might | |
330 | * cause EIO. This is horribly awful, but unlikely to be | |
331 | * changed in the kernel. Hence we work around this problem by | |
332 | * retrying a couple of times. | |
333 | * | |
334 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
335 | */ | |
336 | ||
35bdab77 LP |
337 | if (mode & O_CREAT) |
338 | return -EINVAL; | |
288a74cc RC |
339 | |
340 | for (;;) { | |
341 | fd = open(name, mode, 0); | |
342 | if (fd >= 0) | |
343 | break; | |
344 | ||
345 | if (errno != EIO) | |
346 | return -errno; | |
347 | ||
348 | /* Max 1s in total */ | |
349 | if (c >= 20) | |
350 | return -errno; | |
351 | ||
352 | usleep(50 * USEC_PER_MSEC); | |
353 | c++; | |
354 | } | |
355 | ||
87964ec7 | 356 | if (isatty(fd) <= 0) { |
288a74cc RC |
357 | safe_close(fd); |
358 | return -ENOTTY; | |
359 | } | |
360 | ||
361 | return fd; | |
362 | } | |
363 | ||
364 | int acquire_terminal( | |
365 | const char *name, | |
8854d795 | 366 | AcquireTerminalFlags flags, |
288a74cc RC |
367 | usec_t timeout) { |
368 | ||
8854d795 LP |
369 | _cleanup_close_ int notify = -1, fd = -1; |
370 | usec_t ts = USEC_INFINITY; | |
371 | int r, wd = -1; | |
288a74cc RC |
372 | |
373 | assert(name); | |
8854d795 | 374 | assert(IN_SET(flags & ~ACQUIRE_TERMINAL_PERMISSIVE, ACQUIRE_TERMINAL_TRY, ACQUIRE_TERMINAL_FORCE, ACQUIRE_TERMINAL_WAIT)); |
288a74cc | 375 | |
8854d795 LP |
376 | /* We use inotify to be notified when the tty is closed. We create the watch before checking if we can actually |
377 | * acquire it, so that we don't lose any event. | |
288a74cc | 378 | * |
8854d795 LP |
379 | * Note: strictly speaking this actually watches for the device being closed, it does *not* really watch |
380 | * whether a tty loses its controlling process. However, unless some rogue process uses TIOCNOTTY on /dev/tty | |
f95dbcc2 ZJS |
381 | * *after* closing its tty otherwise this will not become a problem. As long as the administrator makes sure to |
382 | * not configure any service on the same tty as an untrusted user this should not be a problem. (Which they | |
8854d795 LP |
383 | * probably should not do anyway.) */ |
384 | ||
385 | if ((flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_WAIT) { | |
288a74cc | 386 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); |
8854d795 LP |
387 | if (notify < 0) |
388 | return -errno; | |
288a74cc RC |
389 | |
390 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
8854d795 LP |
391 | if (wd < 0) |
392 | return -errno; | |
393 | ||
394 | if (timeout != USEC_INFINITY) | |
395 | ts = now(CLOCK_MONOTONIC); | |
288a74cc RC |
396 | } |
397 | ||
398 | for (;;) { | |
399 | struct sigaction sa_old, sa_new = { | |
400 | .sa_handler = SIG_IGN, | |
401 | .sa_flags = SA_RESTART, | |
402 | }; | |
403 | ||
404 | if (notify >= 0) { | |
405 | r = flush_fd(notify); | |
406 | if (r < 0) | |
8854d795 | 407 | return r; |
288a74cc RC |
408 | } |
409 | ||
8854d795 LP |
410 | /* We pass here O_NOCTTY only so that we can check the return value TIOCSCTTY and have a reliable way |
411 | * to figure out if we successfully became the controlling process of the tty */ | |
288a74cc RC |
412 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); |
413 | if (fd < 0) | |
414 | return fd; | |
415 | ||
8854d795 | 416 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed if we already own the tty. */ |
288a74cc RC |
417 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); |
418 | ||
419 | /* First, try to get the tty */ | |
8854d795 LP |
420 | r = ioctl(fd, TIOCSCTTY, |
421 | (flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_FORCE) < 0 ? -errno : 0; | |
288a74cc | 422 | |
8854d795 | 423 | /* Reset signal handler to old value */ |
288a74cc RC |
424 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); |
425 | ||
8854d795 LP |
426 | /* Success? Exit the loop now! */ |
427 | if (r >= 0) | |
428 | break; | |
288a74cc | 429 | |
8854d795 LP |
430 | /* Any failure besides -EPERM? Fail, regardless of the mode. */ |
431 | if (r != -EPERM) | |
432 | return r; | |
288a74cc | 433 | |
8854d795 LP |
434 | if (flags & ACQUIRE_TERMINAL_PERMISSIVE) /* If we are in permissive mode, then EPERM is fine, turn this |
435 | * into a success. Note that EPERM is also returned if we | |
436 | * already are the owner of the TTY. */ | |
288a74cc RC |
437 | break; |
438 | ||
8854d795 LP |
439 | if (flags != ACQUIRE_TERMINAL_WAIT) /* If we are in TRY or FORCE mode, then propagate EPERM as EPERM */ |
440 | return r; | |
441 | ||
288a74cc | 442 | assert(notify >= 0); |
8854d795 | 443 | assert(wd >= 0); |
288a74cc RC |
444 | |
445 | for (;;) { | |
446 | union inotify_event_buffer buffer; | |
447 | struct inotify_event *e; | |
448 | ssize_t l; | |
449 | ||
450 | if (timeout != USEC_INFINITY) { | |
451 | usec_t n; | |
452 | ||
8854d795 LP |
453 | assert(ts != USEC_INFINITY); |
454 | ||
288a74cc | 455 | n = now(CLOCK_MONOTONIC); |
8854d795 LP |
456 | if (ts + timeout < n) |
457 | return -ETIMEDOUT; | |
288a74cc | 458 | |
f80da6f3 | 459 | r = fd_wait_for_event(notify, POLLIN, ts + timeout - n); |
288a74cc | 460 | if (r < 0) |
8854d795 LP |
461 | return r; |
462 | if (r == 0) | |
463 | return -ETIMEDOUT; | |
288a74cc RC |
464 | } |
465 | ||
466 | l = read(notify, &buffer, sizeof(buffer)); | |
467 | if (l < 0) { | |
3742095b | 468 | if (IN_SET(errno, EINTR, EAGAIN)) |
288a74cc RC |
469 | continue; |
470 | ||
8854d795 | 471 | return -errno; |
288a74cc RC |
472 | } |
473 | ||
474 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
8854d795 LP |
475 | if (e->mask & IN_Q_OVERFLOW) /* If we hit an inotify queue overflow, simply check if the terminal is up for grabs now. */ |
476 | break; | |
477 | ||
478 | if (e->wd != wd || !(e->mask & IN_CLOSE)) /* Safety checks */ | |
479 | return -EIO; | |
288a74cc RC |
480 | } |
481 | ||
482 | break; | |
483 | } | |
484 | ||
8854d795 LP |
485 | /* We close the tty fd here since if the old session ended our handle will be dead. It's important that |
486 | * we do this after sleeping, so that we don't enter an endless loop. */ | |
288a74cc RC |
487 | fd = safe_close(fd); |
488 | } | |
489 | ||
c10d6bdb | 490 | return TAKE_FD(fd); |
288a74cc RC |
491 | } |
492 | ||
493 | int release_terminal(void) { | |
494 | static const struct sigaction sa_new = { | |
495 | .sa_handler = SIG_IGN, | |
496 | .sa_flags = SA_RESTART, | |
497 | }; | |
498 | ||
499 | _cleanup_close_ int fd = -1; | |
500 | struct sigaction sa_old; | |
87964ec7 | 501 | int r; |
288a74cc | 502 | |
0a8b555c | 503 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
504 | if (fd < 0) |
505 | return -errno; | |
506 | ||
507 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
508 | * by our own TIOCNOTTY */ | |
509 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
510 | ||
87964ec7 | 511 | r = ioctl(fd, TIOCNOTTY) < 0 ? -errno : 0; |
288a74cc RC |
512 | |
513 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
514 | ||
515 | return r; | |
516 | } | |
517 | ||
518 | int terminal_vhangup_fd(int fd) { | |
519 | assert(fd >= 0); | |
520 | ||
521 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
522 | return -errno; | |
523 | ||
524 | return 0; | |
525 | } | |
526 | ||
527 | int terminal_vhangup(const char *name) { | |
528 | _cleanup_close_ int fd; | |
529 | ||
0a8b555c | 530 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
531 | if (fd < 0) |
532 | return fd; | |
533 | ||
534 | return terminal_vhangup_fd(fd); | |
535 | } | |
536 | ||
537 | int vt_disallocate(const char *name) { | |
1ba23931 | 538 | _cleanup_close_ int fd = -1; |
27458ed6 | 539 | const char *e, *n; |
288a74cc | 540 | unsigned u; |
1ba23931 | 541 | int r; |
288a74cc RC |
542 | |
543 | /* Deallocate the VT if possible. If not possible | |
544 | * (i.e. because it is the active one), at least clear it | |
545 | * entirely (including the scrollback buffer) */ | |
546 | ||
27458ed6 LP |
547 | e = path_startswith(name, "/dev/"); |
548 | if (!e) | |
288a74cc RC |
549 | return -EINVAL; |
550 | ||
551 | if (!tty_is_vc(name)) { | |
552 | /* So this is not a VT. I guess we cannot deallocate | |
553 | * it then. But let's at least clear the screen */ | |
554 | ||
555 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
556 | if (fd < 0) | |
557 | return fd; | |
558 | ||
559 | loop_write(fd, | |
560 | "\033[r" /* clear scrolling region */ | |
561 | "\033[H" /* move home */ | |
562 | "\033[2J", /* clear screen */ | |
563 | 10, false); | |
288a74cc RC |
564 | return 0; |
565 | } | |
566 | ||
27458ed6 LP |
567 | n = startswith(e, "tty"); |
568 | if (!n) | |
288a74cc RC |
569 | return -EINVAL; |
570 | ||
27458ed6 | 571 | r = safe_atou(n, &u); |
288a74cc RC |
572 | if (r < 0) |
573 | return r; | |
574 | ||
575 | if (u <= 0) | |
576 | return -EINVAL; | |
577 | ||
578 | /* Try to deallocate */ | |
0a8b555c | 579 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
580 | if (fd < 0) |
581 | return fd; | |
582 | ||
583 | r = ioctl(fd, VT_DISALLOCATE, u); | |
1ba23931 | 584 | fd = safe_close(fd); |
288a74cc RC |
585 | |
586 | if (r >= 0) | |
587 | return 0; | |
588 | ||
589 | if (errno != EBUSY) | |
590 | return -errno; | |
591 | ||
592 | /* Couldn't deallocate, so let's clear it fully with | |
593 | * scrollback */ | |
594 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
595 | if (fd < 0) | |
596 | return fd; | |
597 | ||
598 | loop_write(fd, | |
599 | "\033[r" /* clear scrolling region */ | |
600 | "\033[H" /* move home */ | |
601 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
602 | 10, false); | |
288a74cc RC |
603 | return 0; |
604 | } | |
605 | ||
288a74cc RC |
606 | int make_console_stdio(void) { |
607 | int fd, r; | |
608 | ||
609 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr */ | |
610 | ||
8854d795 | 611 | fd = acquire_terminal("/dev/console", ACQUIRE_TERMINAL_FORCE|ACQUIRE_TERMINAL_PERMISSIVE, USEC_INFINITY); |
288a74cc RC |
612 | if (fd < 0) |
613 | return log_error_errno(fd, "Failed to acquire terminal: %m"); | |
614 | ||
3d18b167 LP |
615 | r = reset_terminal_fd(fd, true); |
616 | if (r < 0) | |
617 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
618 | ||
8bb2db73 | 619 | r = rearrange_stdio(fd, fd, fd); /* This invalidates 'fd' both on success and on failure. */ |
288a74cc | 620 | if (r < 0) |
8bb2db73 | 621 | return log_error_errno(r, "Failed to make terminal stdin/stdout/stderr: %m"); |
288a74cc | 622 | |
c6063244 LP |
623 | reset_terminal_feature_caches(); |
624 | ||
288a74cc RC |
625 | return 0; |
626 | } | |
627 | ||
288a74cc RC |
628 | bool tty_is_vc(const char *tty) { |
629 | assert(tty); | |
630 | ||
631 | return vtnr_from_tty(tty) >= 0; | |
632 | } | |
633 | ||
634 | bool tty_is_console(const char *tty) { | |
635 | assert(tty); | |
636 | ||
a119ec7c | 637 | return streq(skip_dev_prefix(tty), "console"); |
288a74cc RC |
638 | } |
639 | ||
640 | int vtnr_from_tty(const char *tty) { | |
641 | int i, r; | |
642 | ||
643 | assert(tty); | |
644 | ||
a119ec7c | 645 | tty = skip_dev_prefix(tty); |
288a74cc RC |
646 | |
647 | if (!startswith(tty, "tty") ) | |
648 | return -EINVAL; | |
649 | ||
650 | if (tty[3] < '0' || tty[3] > '9') | |
651 | return -EINVAL; | |
652 | ||
653 | r = safe_atoi(tty+3, &i); | |
654 | if (r < 0) | |
655 | return r; | |
656 | ||
657 | if (i < 0 || i > 63) | |
658 | return -EINVAL; | |
659 | ||
660 | return i; | |
661 | } | |
662 | ||
7b912648 LP |
663 | int resolve_dev_console(char **ret) { |
664 | _cleanup_free_ char *active = NULL; | |
288a74cc | 665 | char *tty; |
7b912648 | 666 | int r; |
288a74cc | 667 | |
7b912648 LP |
668 | assert(ret); |
669 | ||
670 | /* Resolve where /dev/console is pointing to, if /sys is actually ours (i.e. not read-only-mounted which is a | |
671 | * sign for container setups) */ | |
288a74cc RC |
672 | |
673 | if (path_is_read_only_fs("/sys") > 0) | |
7b912648 | 674 | return -ENOMEDIUM; |
288a74cc | 675 | |
7b912648 LP |
676 | r = read_one_line_file("/sys/class/tty/console/active", &active); |
677 | if (r < 0) | |
678 | return r; | |
288a74cc | 679 | |
7b912648 LP |
680 | /* If multiple log outputs are configured the last one is what /dev/console points to */ |
681 | tty = strrchr(active, ' '); | |
288a74cc RC |
682 | if (tty) |
683 | tty++; | |
684 | else | |
7b912648 | 685 | tty = active; |
288a74cc RC |
686 | |
687 | if (streq(tty, "tty0")) { | |
7b912648 | 688 | active = mfree(active); |
288a74cc RC |
689 | |
690 | /* Get the active VC (e.g. tty1) */ | |
7b912648 LP |
691 | r = read_one_line_file("/sys/class/tty/tty0/active", &active); |
692 | if (r < 0) | |
693 | return r; | |
694 | ||
695 | tty = active; | |
696 | } | |
697 | ||
ae2a15bc LP |
698 | if (tty == active) |
699 | *ret = TAKE_PTR(active); | |
700 | else { | |
7b912648 LP |
701 | char *tmp; |
702 | ||
703 | tmp = strdup(tty); | |
704 | if (!tmp) | |
705 | return -ENOMEM; | |
706 | ||
707 | *ret = tmp; | |
288a74cc RC |
708 | } |
709 | ||
7b912648 | 710 | return 0; |
288a74cc RC |
711 | } |
712 | ||
bef41af2 LP |
713 | int get_kernel_consoles(char ***ret) { |
714 | _cleanup_strv_free_ char **l = NULL; | |
6af62124 | 715 | _cleanup_free_ char *line = NULL; |
bef41af2 | 716 | const char *p; |
6af62124 WF |
717 | int r; |
718 | ||
bef41af2 LP |
719 | assert(ret); |
720 | ||
f95dbcc2 | 721 | /* If /sys is mounted read-only this means we are running in some kind of container environment. In that |
bef41af2 LP |
722 | * case /sys would reflect the host system, not us, hence ignore the data we can read from it. */ |
723 | if (path_is_read_only_fs("/sys") > 0) | |
724 | goto fallback; | |
6af62124 WF |
725 | |
726 | r = read_one_line_file("/sys/class/tty/console/active", &line); | |
727 | if (r < 0) | |
728 | return r; | |
729 | ||
bef41af2 | 730 | p = line; |
6af62124 WF |
731 | for (;;) { |
732 | _cleanup_free_ char *tty = NULL; | |
733 | char *path; | |
734 | ||
bef41af2 | 735 | r = extract_first_word(&p, &tty, NULL, 0); |
6af62124 WF |
736 | if (r < 0) |
737 | return r; | |
738 | if (r == 0) | |
739 | break; | |
740 | ||
741 | if (streq(tty, "tty0")) { | |
742 | tty = mfree(tty); | |
743 | r = read_one_line_file("/sys/class/tty/tty0/active", &tty); | |
744 | if (r < 0) | |
745 | return r; | |
746 | } | |
747 | ||
748 | path = strappend("/dev/", tty); | |
749 | if (!path) | |
750 | return -ENOMEM; | |
751 | ||
752 | if (access(path, F_OK) < 0) { | |
753 | log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path); | |
754 | free(path); | |
755 | continue; | |
756 | } | |
757 | ||
bef41af2 | 758 | r = strv_consume(&l, path); |
6af62124 WF |
759 | if (r < 0) |
760 | return r; | |
761 | } | |
762 | ||
bef41af2 | 763 | if (strv_isempty(l)) { |
6af62124 | 764 | log_debug("No devices found for system console"); |
bef41af2 | 765 | goto fallback; |
6af62124 WF |
766 | } |
767 | ||
ae2a15bc | 768 | *ret = TAKE_PTR(l); |
bef41af2 LP |
769 | |
770 | return 0; | |
771 | ||
772 | fallback: | |
773 | r = strv_extend(&l, "/dev/console"); | |
774 | if (r < 0) | |
775 | return r; | |
776 | ||
ae2a15bc | 777 | *ret = TAKE_PTR(l); |
bef41af2 | 778 | |
6af62124 WF |
779 | return 0; |
780 | } | |
781 | ||
288a74cc | 782 | bool tty_is_vc_resolve(const char *tty) { |
7b912648 | 783 | _cleanup_free_ char *resolved = NULL; |
288a74cc RC |
784 | |
785 | assert(tty); | |
786 | ||
a119ec7c | 787 | tty = skip_dev_prefix(tty); |
288a74cc RC |
788 | |
789 | if (streq(tty, "console")) { | |
7b912648 | 790 | if (resolve_dev_console(&resolved) < 0) |
288a74cc | 791 | return false; |
7b912648 LP |
792 | |
793 | tty = resolved; | |
288a74cc RC |
794 | } |
795 | ||
796 | return tty_is_vc(tty); | |
797 | } | |
798 | ||
799 | const char *default_term_for_tty(const char *tty) { | |
6af760f3 | 800 | return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220"; |
288a74cc RC |
801 | } |
802 | ||
803 | int fd_columns(int fd) { | |
804 | struct winsize ws = {}; | |
805 | ||
806 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
807 | return -errno; | |
808 | ||
809 | if (ws.ws_col <= 0) | |
810 | return -EIO; | |
811 | ||
812 | return ws.ws_col; | |
813 | } | |
814 | ||
815 | unsigned columns(void) { | |
816 | const char *e; | |
817 | int c; | |
818 | ||
c6063244 | 819 | if (cached_columns > 0) |
288a74cc RC |
820 | return cached_columns; |
821 | ||
822 | c = 0; | |
823 | e = getenv("COLUMNS"); | |
824 | if (e) | |
825 | (void) safe_atoi(e, &c); | |
826 | ||
827 | if (c <= 0) | |
828 | c = fd_columns(STDOUT_FILENO); | |
829 | ||
830 | if (c <= 0) | |
831 | c = 80; | |
832 | ||
833 | cached_columns = c; | |
834 | return cached_columns; | |
835 | } | |
836 | ||
837 | int fd_lines(int fd) { | |
838 | struct winsize ws = {}; | |
839 | ||
840 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
841 | return -errno; | |
842 | ||
843 | if (ws.ws_row <= 0) | |
844 | return -EIO; | |
845 | ||
846 | return ws.ws_row; | |
847 | } | |
848 | ||
849 | unsigned lines(void) { | |
850 | const char *e; | |
851 | int l; | |
852 | ||
c6063244 | 853 | if (cached_lines > 0) |
288a74cc RC |
854 | return cached_lines; |
855 | ||
856 | l = 0; | |
857 | e = getenv("LINES"); | |
858 | if (e) | |
859 | (void) safe_atoi(e, &l); | |
860 | ||
861 | if (l <= 0) | |
862 | l = fd_lines(STDOUT_FILENO); | |
863 | ||
864 | if (l <= 0) | |
865 | l = 24; | |
866 | ||
867 | cached_lines = l; | |
868 | return cached_lines; | |
869 | } | |
870 | ||
871 | /* intended to be used as a SIGWINCH sighandler */ | |
872 | void columns_lines_cache_reset(int signum) { | |
873 | cached_columns = 0; | |
874 | cached_lines = 0; | |
875 | } | |
876 | ||
c6063244 LP |
877 | void reset_terminal_feature_caches(void) { |
878 | cached_columns = 0; | |
879 | cached_lines = 0; | |
880 | ||
881 | cached_colors_enabled = -1; | |
882 | cached_underline_enabled = -1; | |
883 | cached_on_tty = -1; | |
884 | } | |
288a74cc | 885 | |
c6063244 LP |
886 | bool on_tty(void) { |
887 | if (cached_on_tty < 0) | |
288a74cc RC |
888 | cached_on_tty = isatty(STDOUT_FILENO) > 0; |
889 | ||
890 | return cached_on_tty; | |
891 | } | |
892 | ||
288a74cc RC |
893 | int getttyname_malloc(int fd, char **ret) { |
894 | size_t l = 100; | |
895 | int r; | |
896 | ||
897 | assert(fd >= 0); | |
898 | assert(ret); | |
899 | ||
900 | for (;;) { | |
901 | char path[l]; | |
902 | ||
903 | r = ttyname_r(fd, path, sizeof(path)); | |
904 | if (r == 0) { | |
288a74cc RC |
905 | char *c; |
906 | ||
a119ec7c | 907 | c = strdup(skip_dev_prefix(path)); |
288a74cc RC |
908 | if (!c) |
909 | return -ENOMEM; | |
910 | ||
911 | *ret = c; | |
912 | return 0; | |
913 | } | |
914 | ||
915 | if (r != ERANGE) | |
916 | return -r; | |
917 | ||
918 | l *= 2; | |
919 | } | |
920 | ||
921 | return 0; | |
922 | } | |
923 | ||
924 | int getttyname_harder(int fd, char **r) { | |
925 | int k; | |
926 | char *s = NULL; | |
927 | ||
928 | k = getttyname_malloc(fd, &s); | |
929 | if (k < 0) | |
930 | return k; | |
931 | ||
932 | if (streq(s, "tty")) { | |
933 | free(s); | |
934 | return get_ctty(0, NULL, r); | |
935 | } | |
936 | ||
937 | *r = s; | |
938 | return 0; | |
939 | } | |
940 | ||
941 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
942 | int r; | |
943 | _cleanup_free_ char *line = NULL; | |
944 | const char *p; | |
945 | unsigned long ttynr; | |
946 | ||
947 | assert(pid >= 0); | |
948 | ||
949 | p = procfs_file_alloca(pid, "stat"); | |
950 | r = read_one_line_file(p, &line); | |
951 | if (r < 0) | |
952 | return r; | |
953 | ||
954 | p = strrchr(line, ')'); | |
955 | if (!p) | |
956 | return -EIO; | |
957 | ||
958 | p++; | |
959 | ||
960 | if (sscanf(p, " " | |
961 | "%*c " /* state */ | |
962 | "%*d " /* ppid */ | |
963 | "%*d " /* pgrp */ | |
964 | "%*d " /* session */ | |
965 | "%lu ", /* ttynr */ | |
966 | &ttynr) != 1) | |
967 | return -EIO; | |
968 | ||
969 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
cfeaa44a | 970 | return -ENXIO; |
288a74cc RC |
971 | |
972 | if (d) | |
973 | *d = (dev_t) ttynr; | |
974 | ||
975 | return 0; | |
976 | } | |
977 | ||
978 | int get_ctty(pid_t pid, dev_t *_devnr, char **r) { | |
fbd0b64f | 979 | char fn[STRLEN("/dev/char/") + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL; |
288a74cc RC |
980 | _cleanup_free_ char *s = NULL; |
981 | const char *p; | |
982 | dev_t devnr; | |
983 | int k; | |
984 | ||
985 | assert(r); | |
986 | ||
987 | k = get_ctty_devnr(pid, &devnr); | |
988 | if (k < 0) | |
989 | return k; | |
990 | ||
991 | sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr)); | |
992 | ||
993 | k = readlink_malloc(fn, &s); | |
994 | if (k < 0) { | |
995 | ||
996 | if (k != -ENOENT) | |
997 | return k; | |
998 | ||
999 | /* This is an ugly hack */ | |
1000 | if (major(devnr) == 136) { | |
1001 | if (asprintf(&b, "pts/%u", minor(devnr)) < 0) | |
1002 | return -ENOMEM; | |
1003 | } else { | |
1004 | /* Probably something like the ptys which have no | |
1005 | * symlink in /dev/char. Let's return something | |
1006 | * vaguely useful. */ | |
1007 | ||
1008 | b = strdup(fn + 5); | |
1009 | if (!b) | |
1010 | return -ENOMEM; | |
1011 | } | |
1012 | } else { | |
1013 | if (startswith(s, "/dev/")) | |
1014 | p = s + 5; | |
1015 | else if (startswith(s, "../")) | |
1016 | p = s + 3; | |
1017 | else | |
1018 | p = s; | |
1019 | ||
1020 | b = strdup(p); | |
1021 | if (!b) | |
1022 | return -ENOMEM; | |
1023 | } | |
1024 | ||
1025 | *r = b; | |
1026 | if (_devnr) | |
1027 | *_devnr = devnr; | |
1028 | ||
1029 | return 0; | |
1030 | } | |
a07c35c3 | 1031 | |
66cb2fde LP |
1032 | int ptsname_malloc(int fd, char **ret) { |
1033 | size_t l = 100; | |
1034 | ||
1035 | assert(fd >= 0); | |
1036 | assert(ret); | |
1037 | ||
1038 | for (;;) { | |
1039 | char *c; | |
1040 | ||
1041 | c = new(char, l); | |
1042 | if (!c) | |
1043 | return -ENOMEM; | |
1044 | ||
1045 | if (ptsname_r(fd, c, l) == 0) { | |
1046 | *ret = c; | |
1047 | return 0; | |
1048 | } | |
1049 | if (errno != ERANGE) { | |
1050 | free(c); | |
1051 | return -errno; | |
1052 | } | |
1053 | ||
1054 | free(c); | |
1055 | l *= 2; | |
1056 | } | |
1057 | } | |
1058 | ||
a07c35c3 LP |
1059 | int ptsname_namespace(int pty, char **ret) { |
1060 | int no = -1, r; | |
1061 | ||
1062 | /* Like ptsname(), but doesn't assume that the path is | |
1063 | * accessible in the local namespace. */ | |
1064 | ||
1065 | r = ioctl(pty, TIOCGPTN, &no); | |
1066 | if (r < 0) | |
1067 | return -errno; | |
1068 | ||
1069 | if (no < 0) | |
1070 | return -EIO; | |
1071 | ||
1072 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1073 | return -ENOMEM; | |
1074 | ||
1075 | return 0; | |
1076 | } | |
66cb2fde LP |
1077 | |
1078 | int openpt_in_namespace(pid_t pid, int flags) { | |
1079 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1080 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
66cb2fde LP |
1081 | pid_t child; |
1082 | int r; | |
1083 | ||
1084 | assert(pid > 0); | |
1085 | ||
1086 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1087 | if (r < 0) | |
1088 | return r; | |
1089 | ||
1090 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1091 | return -errno; | |
1092 | ||
4c253ed1 LP |
1093 | r = safe_fork("(sd-openpt)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child); |
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 | ||
1101 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1102 | if (r < 0) | |
1103 | _exit(EXIT_FAILURE); | |
1104 | ||
1105 | master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); | |
1106 | if (master < 0) | |
1107 | _exit(EXIT_FAILURE); | |
1108 | ||
1109 | if (unlockpt(master) < 0) | |
1110 | _exit(EXIT_FAILURE); | |
1111 | ||
1112 | if (send_one_fd(pair[1], master, 0) < 0) | |
1113 | _exit(EXIT_FAILURE); | |
1114 | ||
1115 | _exit(EXIT_SUCCESS); | |
1116 | } | |
1117 | ||
1118 | pair[1] = safe_close(pair[1]); | |
1119 | ||
2e87a1fd | 1120 | r = wait_for_terminate_and_check("(sd-openpt)", child, 0); |
66cb2fde LP |
1121 | if (r < 0) |
1122 | return r; | |
2e87a1fd | 1123 | if (r != EXIT_SUCCESS) |
66cb2fde LP |
1124 | return -EIO; |
1125 | ||
1126 | return receive_one_fd(pair[0], 0); | |
1127 | } | |
40e1f4ea LP |
1128 | |
1129 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
1130 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1131 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
40e1f4ea LP |
1132 | pid_t child; |
1133 | int r; | |
1134 | ||
1135 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1136 | if (r < 0) | |
1137 | return r; | |
1138 | ||
1139 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1140 | return -errno; | |
1141 | ||
4c253ed1 LP |
1142 | r = safe_fork("(sd-terminal)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child); |
1143 | if (r < 0) | |
1144 | return r; | |
1145 | if (r == 0) { | |
40e1f4ea LP |
1146 | int master; |
1147 | ||
1148 | pair[0] = safe_close(pair[0]); | |
1149 | ||
1150 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1151 | if (r < 0) | |
1152 | _exit(EXIT_FAILURE); | |
1153 | ||
1154 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); | |
1155 | if (master < 0) | |
1156 | _exit(EXIT_FAILURE); | |
1157 | ||
1158 | if (send_one_fd(pair[1], master, 0) < 0) | |
1159 | _exit(EXIT_FAILURE); | |
1160 | ||
1161 | _exit(EXIT_SUCCESS); | |
1162 | } | |
1163 | ||
1164 | pair[1] = safe_close(pair[1]); | |
1165 | ||
2e87a1fd | 1166 | r = wait_for_terminate_and_check("(sd-terminal)", child, 0); |
40e1f4ea LP |
1167 | if (r < 0) |
1168 | return r; | |
2e87a1fd | 1169 | if (r != EXIT_SUCCESS) |
40e1f4ea LP |
1170 | return -EIO; |
1171 | ||
1172 | return receive_one_fd(pair[0], 0); | |
1173 | } | |
40c9fe4c | 1174 | |
158fbf76 | 1175 | static bool getenv_terminal_is_dumb(void) { |
ac96418b LP |
1176 | const char *e; |
1177 | ||
ac96418b LP |
1178 | e = getenv("TERM"); |
1179 | if (!e) | |
1180 | return true; | |
1181 | ||
1182 | return streq(e, "dumb"); | |
1183 | } | |
1184 | ||
158fbf76 ZJS |
1185 | bool terminal_is_dumb(void) { |
1186 | if (!on_tty()) | |
1187 | return true; | |
1188 | ||
1189 | return getenv_terminal_is_dumb(); | |
1190 | } | |
1191 | ||
40c9fe4c | 1192 | bool colors_enabled(void) { |
40c9fe4c | 1193 | |
0295642d | 1194 | /* Returns true if colors are considered supported on our stdout. For that we check $SYSTEMD_COLORS first |
f95dbcc2 | 1195 | * (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 |
1196 | * 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 |
1197 | * we are PID 1 then we do not check whether we are connected to a TTY, because we don't keep /dev/console open | |
1198 | * continously due to fear of SAK, and hence things are a bit weird. */ | |
1199 | ||
c6063244 | 1200 | if (cached_colors_enabled < 0) { |
acf553b0 | 1201 | int val; |
ae5b3958 | 1202 | |
acf553b0 ZJS |
1203 | val = getenv_bool("SYSTEMD_COLORS"); |
1204 | if (val >= 0) | |
c6063244 | 1205 | cached_colors_enabled = val; |
df0ff127 | 1206 | else if (getpid_cached() == 1) |
158fbf76 | 1207 | /* PID1 outputs to the console without holding it open all the time */ |
c6063244 | 1208 | cached_colors_enabled = !getenv_terminal_is_dumb(); |
ae5b3958 | 1209 | else |
c6063244 | 1210 | cached_colors_enabled = !terminal_is_dumb(); |
40c9fe4c JS |
1211 | } |
1212 | ||
c6063244 | 1213 | return cached_colors_enabled; |
40c9fe4c | 1214 | } |
c83f349c | 1215 | |
c2b32159 LP |
1216 | bool dev_console_colors_enabled(void) { |
1217 | _cleanup_free_ char *s = NULL; | |
1218 | int b; | |
1219 | ||
1220 | /* Returns true if we assume that color is supported on /dev/console. | |
1221 | * | |
1222 | * For that we first check if we explicitly got told to use colors or not, by checking $SYSTEMD_COLORS. If that | |
f95dbcc2 ZJS |
1223 | * isn't set we check whether PID 1 has $TERM set, and if not, whether TERM is set on the kernel command |
1224 | * line. If we find $TERM set we assume color if it's not set to "dumb", similarly to how regular | |
c2b32159 LP |
1225 | * colors_enabled() operates. */ |
1226 | ||
1227 | b = getenv_bool("SYSTEMD_COLORS"); | |
1228 | if (b >= 0) | |
1229 | return b; | |
1230 | ||
1231 | if (getenv_for_pid(1, "TERM", &s) <= 0) | |
1232 | (void) proc_cmdline_get_key("TERM", 0, &s); | |
1233 | ||
1234 | return !streq_ptr(s, "dumb"); | |
1235 | } | |
1236 | ||
526664f6 | 1237 | bool underline_enabled(void) { |
526664f6 | 1238 | |
c6063244 | 1239 | if (cached_underline_enabled < 0) { |
526664f6 LP |
1240 | |
1241 | /* The Linux console doesn't support underlining, turn it off, but only there. */ | |
1242 | ||
c6063244 LP |
1243 | if (colors_enabled()) |
1244 | cached_underline_enabled = !streq_ptr(getenv("TERM"), "linux"); | |
526664f6 | 1245 | else |
c6063244 | 1246 | cached_underline_enabled = false; |
526664f6 LP |
1247 | } |
1248 | ||
c6063244 | 1249 | return cached_underline_enabled; |
526664f6 LP |
1250 | } |
1251 | ||
c83f349c LP |
1252 | int vt_default_utf8(void) { |
1253 | _cleanup_free_ char *b = NULL; | |
1254 | int r; | |
1255 | ||
1256 | /* Read the default VT UTF8 setting from the kernel */ | |
1257 | ||
1258 | r = read_one_line_file("/sys/module/vt/parameters/default_utf8", &b); | |
1259 | if (r < 0) | |
1260 | return r; | |
1261 | ||
1262 | return parse_boolean(b); | |
1263 | } | |
1264 | ||
1265 | int vt_reset_keyboard(int fd) { | |
1266 | int kb; | |
1267 | ||
1268 | /* If we can't read the default, then default to unicode. It's 2017 after all. */ | |
1269 | kb = vt_default_utf8() != 0 ? K_UNICODE : K_XLATE; | |
1270 | ||
1271 | if (ioctl(fd, KDSKBMODE, kb) < 0) | |
1272 | return -errno; | |
1273 | ||
1274 | return 0; | |
1275 | } | |
23b27b39 LP |
1276 | |
1277 | static bool urlify_enabled(void) { | |
1278 | static int cached_urlify_enabled = -1; | |
1279 | ||
1280 | /* Unfortunately 'less' doesn't support links like this yet 😭, hence let's disable this as long as there's a | |
1281 | * pager in effect. Let's drop this check as soon as less got fixed a and enough time passed so that it's safe | |
1282 | * to assume that a link-enabled 'less' version has hit most installations. */ | |
1283 | ||
1284 | if (cached_urlify_enabled < 0) { | |
1285 | int val; | |
1286 | ||
1287 | val = getenv_bool("SYSTEMD_URLIFY"); | |
1288 | if (val >= 0) | |
1289 | cached_urlify_enabled = val; | |
1290 | else | |
1291 | cached_urlify_enabled = colors_enabled() && !pager_have(); | |
1292 | } | |
1293 | ||
1294 | return cached_urlify_enabled; | |
1295 | } | |
1296 | ||
1297 | int terminal_urlify(const char *url, const char *text, char **ret) { | |
1298 | char *n; | |
1299 | ||
1300 | assert(url); | |
1301 | ||
1302 | /* Takes an URL and a pretty string and formats it as clickable link for the terminal. See | |
1303 | * https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda for details. */ | |
1304 | ||
1305 | if (isempty(text)) | |
1306 | text = url; | |
1307 | ||
1308 | if (urlify_enabled()) | |
1309 | n = strjoin("\x1B]8;;", url, "\a", text, "\x1B]8;;\a"); | |
1310 | else | |
1311 | n = strdup(text); | |
1312 | if (!n) | |
1313 | return -ENOMEM; | |
1314 | ||
1315 | *ret = n; | |
1316 | return 0; | |
1317 | } | |
1318 | ||
1319 | int terminal_urlify_path(const char *path, const char *text, char **ret) { | |
1320 | _cleanup_free_ char *absolute = NULL; | |
1321 | struct utsname u; | |
1322 | const char *url; | |
1323 | int r; | |
1324 | ||
1325 | assert(path); | |
1326 | ||
cdacc27e ZJS |
1327 | /* Much like terminal_urlify() above, but takes a file system path as input |
1328 | * and turns it into a proper file:// URL first. */ | |
23b27b39 LP |
1329 | |
1330 | if (isempty(path)) | |
1331 | return -EINVAL; | |
1332 | ||
1333 | if (isempty(text)) | |
1334 | text = path; | |
1335 | ||
1336 | if (!urlify_enabled()) { | |
1337 | char *n; | |
1338 | ||
1339 | n = strdup(text); | |
1340 | if (!n) | |
1341 | return -ENOMEM; | |
1342 | ||
1343 | *ret = n; | |
1344 | return 0; | |
1345 | } | |
1346 | ||
1347 | if (uname(&u) < 0) | |
1348 | return -errno; | |
1349 | ||
1350 | if (!path_is_absolute(path)) { | |
1351 | r = path_make_absolute_cwd(path, &absolute); | |
1352 | if (r < 0) | |
1353 | return r; | |
1354 | ||
1355 | path = absolute; | |
1356 | } | |
1357 | ||
1358 | /* As suggested by https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda, let's include the local | |
1359 | * hostname here. Note that we don't use gethostname_malloc() or gethostname_strict() since we are interested | |
1360 | * in the raw string the kernel has set, whatever it may be, under the assumption that terminals are not overly | |
1361 | * careful with validating the strings either. */ | |
1362 | ||
1363 | url = strjoina("file://", u.nodename, path); | |
1364 | ||
1365 | return terminal_urlify(url, text, ret); | |
1366 | } | |
81f5e513 ZJS |
1367 | |
1368 | static int cat_file(const char *filename, bool newline) { | |
f8360f33 ZJS |
1369 | _cleanup_fclose_ FILE *f = NULL; |
1370 | int r; | |
81f5e513 | 1371 | |
f8360f33 ZJS |
1372 | f = fopen(filename, "re"); |
1373 | if (!f) | |
81f5e513 ZJS |
1374 | return -errno; |
1375 | ||
1376 | printf("%s%s# %s%s\n", | |
1377 | newline ? "\n" : "", | |
1378 | ansi_highlight_blue(), | |
1379 | filename, | |
1380 | ansi_normal()); | |
1381 | fflush(stdout); | |
1382 | ||
f8360f33 ZJS |
1383 | for (;;) { |
1384 | _cleanup_free_ char *line = NULL; | |
1385 | ||
1386 | r = read_line(f, LONG_LINE_MAX, &line); | |
1387 | if (r < 0) | |
1388 | return log_error_errno(r, "Failed to read \"%s\": %m", filename); | |
1389 | if (r == 0) | |
1390 | break; | |
1391 | ||
1392 | puts(line); | |
1393 | } | |
1394 | ||
1395 | return 0; | |
81f5e513 ZJS |
1396 | } |
1397 | ||
854a42fb | 1398 | int cat_files(const char *file, char **dropins, CatFlags flags) { |
81f5e513 ZJS |
1399 | char **path; |
1400 | int r; | |
1401 | ||
1402 | if (file) { | |
1403 | r = cat_file(file, false); | |
854a42fb ZJS |
1404 | if (r == -ENOENT && (flags & CAT_FLAGS_MAIN_FILE_OPTIONAL)) |
1405 | printf("%s# config file %s not found%s\n", | |
1406 | ansi_highlight_magenta(), | |
1407 | file, | |
1408 | ansi_normal()); | |
1409 | else if (r < 0) | |
81f5e513 ZJS |
1410 | return log_warning_errno(r, "Failed to cat %s: %m", file); |
1411 | } | |
1412 | ||
1413 | STRV_FOREACH(path, dropins) { | |
1414 | r = cat_file(*path, file || path != dropins); | |
1415 | if (r < 0) | |
1416 | return log_warning_errno(r, "Failed to cat %s: %m", *path); | |
1417 | } | |
1418 | ||
1419 | return 0; | |
1420 | } | |
cb91deaf LP |
1421 | |
1422 | void print_separator(void) { | |
1423 | ||
1424 | /* Outputs a separator line that resolves to whitespace when copied from the terminal. We do that by outputting | |
1425 | * one line filled with spaces with ANSI underline set, followed by a second (empty) line. */ | |
1426 | ||
1427 | if (underline_enabled()) { | |
1428 | size_t i, c; | |
1429 | ||
1430 | c = columns(); | |
1431 | ||
1432 | flockfile(stdout); | |
1433 | fputs_unlocked(ANSI_UNDERLINE, stdout); | |
1434 | ||
1435 | for (i = 0; i < c; i++) | |
1436 | fputc_unlocked(' ', stdout); | |
1437 | ||
1438 | fputs_unlocked(ANSI_NORMAL "\n\n", stdout); | |
1439 | funlockfile(stdout); | |
1440 | } else | |
1441 | fputs("\n\n", stdout); | |
1442 | } |