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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" |
acf553b0 | 32 | #include "env-util.h" |
3ffd4af2 | 33 | #include "fd-util.h" |
288a74cc | 34 | #include "fileio.h" |
f4f15635 | 35 | #include "fs-util.h" |
c004493c | 36 | #include "io-util.h" |
93cc7779 TA |
37 | #include "log.h" |
38 | #include "macro.h" | |
23b27b39 | 39 | #include "pager.h" |
6bedfcbb | 40 | #include "parse-util.h" |
c2b32159 LP |
41 | #include "path-util.h" |
42 | #include "proc-cmdline.h" | |
07630cea | 43 | #include "process-util.h" |
2583fbea | 44 | #include "socket-util.h" |
8fcde012 | 45 | #include "stat-util.h" |
07630cea | 46 | #include "string-util.h" |
6af62124 | 47 | #include "strv.h" |
3ffd4af2 | 48 | #include "terminal-util.h" |
07630cea LP |
49 | #include "time-util.h" |
50 | #include "util.h" | |
288a74cc RC |
51 | |
52 | static volatile unsigned cached_columns = 0; | |
53 | static volatile unsigned cached_lines = 0; | |
54 | ||
c6063244 LP |
55 | static volatile int cached_on_tty = -1; |
56 | static volatile int cached_colors_enabled = -1; | |
57 | static volatile int cached_underline_enabled = -1; | |
58 | ||
288a74cc RC |
59 | int chvt(int vt) { |
60 | _cleanup_close_ int fd; | |
61 | ||
0295642d LP |
62 | /* Switch to the specified vt number. If the VT is specified <= 0 switch to the VT the kernel log messages go, |
63 | * if that's configured. */ | |
64 | ||
0a8b555c | 65 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
66 | if (fd < 0) |
67 | return -errno; | |
68 | ||
b9e74c39 | 69 | if (vt <= 0) { |
288a74cc RC |
70 | int tiocl[2] = { |
71 | TIOCL_GETKMSGREDIRECT, | |
72 | 0 | |
73 | }; | |
74 | ||
75 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
76 | return -errno; | |
77 | ||
78 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
79 | } | |
80 | ||
81 | if (ioctl(fd, VT_ACTIVATE, vt) < 0) | |
82 | return -errno; | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { | |
88 | struct termios old_termios, new_termios; | |
89 | char c, line[LINE_MAX]; | |
90 | ||
91 | assert(f); | |
92 | assert(ret); | |
93 | ||
94 | if (tcgetattr(fileno(f), &old_termios) >= 0) { | |
95 | new_termios = old_termios; | |
96 | ||
97 | new_termios.c_lflag &= ~ICANON; | |
98 | new_termios.c_cc[VMIN] = 1; | |
99 | new_termios.c_cc[VTIME] = 0; | |
100 | ||
101 | if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) { | |
102 | size_t k; | |
103 | ||
104 | if (t != USEC_INFINITY) { | |
105 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) { | |
106 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
107 | return -ETIMEDOUT; | |
108 | } | |
109 | } | |
110 | ||
111 | k = fread(&c, 1, 1, f); | |
112 | ||
113 | tcsetattr(fileno(f), TCSADRAIN, &old_termios); | |
114 | ||
115 | if (k <= 0) | |
116 | return -EIO; | |
117 | ||
118 | if (need_nl) | |
119 | *need_nl = c != '\n'; | |
120 | ||
121 | *ret = c; | |
122 | return 0; | |
123 | } | |
124 | } | |
125 | ||
126 | if (t != USEC_INFINITY) { | |
127 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) | |
128 | return -ETIMEDOUT; | |
129 | } | |
130 | ||
131 | errno = 0; | |
132 | if (!fgets(line, sizeof(line), f)) | |
f5e5c28f | 133 | return errno > 0 ? -errno : -EIO; |
288a74cc RC |
134 | |
135 | truncate_nl(line); | |
136 | ||
137 | if (strlen(line) != 1) | |
138 | return -EBADMSG; | |
139 | ||
140 | if (need_nl) | |
141 | *need_nl = false; | |
142 | ||
143 | *ret = line[0]; | |
144 | return 0; | |
145 | } | |
146 | ||
3c670f89 FB |
147 | #define DEFAULT_ASK_REFRESH_USEC (2*USEC_PER_SEC) |
148 | ||
149 | int ask_char(char *ret, const char *replies, const char *fmt, ...) { | |
288a74cc RC |
150 | int r; |
151 | ||
152 | assert(ret); | |
153 | assert(replies); | |
3c670f89 | 154 | assert(fmt); |
288a74cc RC |
155 | |
156 | for (;;) { | |
157 | va_list ap; | |
158 | char c; | |
159 | bool need_nl = true; | |
160 | ||
7565bb98 | 161 | if (colors_enabled()) |
1fc464f6 | 162 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc | 163 | |
3c670f89 FB |
164 | putchar('\r'); |
165 | ||
166 | va_start(ap, fmt); | |
167 | vprintf(fmt, ap); | |
288a74cc RC |
168 | va_end(ap); |
169 | ||
7565bb98 | 170 | if (colors_enabled()) |
1fc464f6 | 171 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
172 | |
173 | fflush(stdout); | |
174 | ||
3c670f89 | 175 | r = read_one_char(stdin, &c, DEFAULT_ASK_REFRESH_USEC, &need_nl); |
288a74cc RC |
176 | if (r < 0) { |
177 | ||
3c670f89 FB |
178 | if (r == -ETIMEDOUT) |
179 | continue; | |
180 | ||
288a74cc RC |
181 | if (r == -EBADMSG) { |
182 | puts("Bad input, please try again."); | |
183 | continue; | |
184 | } | |
185 | ||
186 | putchar('\n'); | |
187 | return r; | |
188 | } | |
189 | ||
190 | if (need_nl) | |
191 | putchar('\n'); | |
192 | ||
193 | if (strchr(replies, c)) { | |
194 | *ret = c; | |
195 | return 0; | |
196 | } | |
197 | ||
198 | puts("Read unexpected character, please try again."); | |
199 | } | |
200 | } | |
201 | ||
202 | int ask_string(char **ret, const char *text, ...) { | |
203 | assert(ret); | |
204 | assert(text); | |
205 | ||
206 | for (;;) { | |
207 | char line[LINE_MAX]; | |
208 | va_list ap; | |
209 | ||
7565bb98 | 210 | if (colors_enabled()) |
1fc464f6 | 211 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc RC |
212 | |
213 | va_start(ap, text); | |
214 | vprintf(text, ap); | |
215 | va_end(ap); | |
216 | ||
7565bb98 | 217 | if (colors_enabled()) |
1fc464f6 | 218 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
219 | |
220 | fflush(stdout); | |
221 | ||
222 | errno = 0; | |
223 | if (!fgets(line, sizeof(line), stdin)) | |
f5e5c28f | 224 | return errno > 0 ? -errno : -EIO; |
288a74cc RC |
225 | |
226 | if (!endswith(line, "\n")) | |
227 | putchar('\n'); | |
228 | else { | |
229 | char *s; | |
230 | ||
231 | if (isempty(line)) | |
232 | continue; | |
233 | ||
234 | truncate_nl(line); | |
235 | s = strdup(line); | |
236 | if (!s) | |
237 | return -ENOMEM; | |
238 | ||
239 | *ret = s; | |
240 | return 0; | |
241 | } | |
242 | } | |
243 | } | |
244 | ||
245 | int reset_terminal_fd(int fd, bool switch_to_text) { | |
246 | struct termios termios; | |
247 | int r = 0; | |
248 | ||
249 | /* Set terminal to some sane defaults */ | |
250 | ||
251 | assert(fd >= 0); | |
252 | ||
253 | /* We leave locked terminal attributes untouched, so that | |
254 | * Plymouth may set whatever it wants to set, and we don't | |
255 | * interfere with that. */ | |
256 | ||
257 | /* Disable exclusive mode, just in case */ | |
7d927c9a | 258 | (void) ioctl(fd, TIOCNXCL); |
288a74cc RC |
259 | |
260 | /* Switch to text mode */ | |
261 | if (switch_to_text) | |
7d927c9a | 262 | (void) ioctl(fd, KDSETMODE, KD_TEXT); |
288a74cc | 263 | |
73e669e0 | 264 | /* Set default keyboard mode */ |
c83f349c | 265 | (void) vt_reset_keyboard(fd); |
288a74cc RC |
266 | |
267 | if (tcgetattr(fd, &termios) < 0) { | |
268 | r = -errno; | |
269 | goto finish; | |
270 | } | |
271 | ||
272 | /* We only reset the stuff that matters to the software. How | |
273 | * hardware is set up we don't touch assuming that somebody | |
274 | * else will do that for us */ | |
275 | ||
276 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
277 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
278 | termios.c_oflag |= ONLCR; | |
279 | termios.c_cflag |= CREAD; | |
280 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
281 | ||
282 | termios.c_cc[VINTR] = 03; /* ^C */ | |
283 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
284 | termios.c_cc[VERASE] = 0177; | |
285 | termios.c_cc[VKILL] = 025; /* ^X */ | |
286 | termios.c_cc[VEOF] = 04; /* ^D */ | |
287 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
288 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
289 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
290 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
291 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
292 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
293 | termios.c_cc[VEOL] = 0; | |
294 | termios.c_cc[VEOL2] = 0; | |
295 | ||
296 | termios.c_cc[VTIME] = 0; | |
297 | termios.c_cc[VMIN] = 1; | |
298 | ||
299 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
300 | r = -errno; | |
301 | ||
302 | finish: | |
303 | /* Just in case, flush all crap out */ | |
7d927c9a | 304 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
305 | |
306 | return r; | |
307 | } | |
308 | ||
309 | int reset_terminal(const char *name) { | |
310 | _cleanup_close_ int fd = -1; | |
311 | ||
0a8b555c LP |
312 | /* We open the terminal with O_NONBLOCK here, to ensure we |
313 | * don't block on carrier if this is a terminal with carrier | |
314 | * configured. */ | |
315 | ||
316 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
317 | if (fd < 0) |
318 | return fd; | |
319 | ||
320 | return reset_terminal_fd(fd, true); | |
321 | } | |
322 | ||
323 | int open_terminal(const char *name, int mode) { | |
288a74cc | 324 | unsigned c = 0; |
87964ec7 | 325 | int fd; |
288a74cc RC |
326 | |
327 | /* | |
328 | * If a TTY is in the process of being closed opening it might | |
329 | * cause EIO. This is horribly awful, but unlikely to be | |
330 | * changed in the kernel. Hence we work around this problem by | |
331 | * retrying a couple of times. | |
332 | * | |
333 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
334 | */ | |
335 | ||
35bdab77 LP |
336 | if (mode & O_CREAT) |
337 | return -EINVAL; | |
288a74cc RC |
338 | |
339 | for (;;) { | |
340 | fd = open(name, mode, 0); | |
341 | if (fd >= 0) | |
342 | break; | |
343 | ||
344 | if (errno != EIO) | |
345 | return -errno; | |
346 | ||
347 | /* Max 1s in total */ | |
348 | if (c >= 20) | |
349 | return -errno; | |
350 | ||
351 | usleep(50 * USEC_PER_MSEC); | |
352 | c++; | |
353 | } | |
354 | ||
87964ec7 | 355 | if (isatty(fd) <= 0) { |
288a74cc RC |
356 | safe_close(fd); |
357 | return -ENOTTY; | |
358 | } | |
359 | ||
360 | return fd; | |
361 | } | |
362 | ||
363 | int acquire_terminal( | |
364 | const char *name, | |
8854d795 | 365 | AcquireTerminalFlags flags, |
288a74cc RC |
366 | usec_t timeout) { |
367 | ||
8854d795 LP |
368 | _cleanup_close_ int notify = -1, fd = -1; |
369 | usec_t ts = USEC_INFINITY; | |
370 | int r, wd = -1; | |
288a74cc RC |
371 | |
372 | assert(name); | |
8854d795 | 373 | assert(IN_SET(flags & ~ACQUIRE_TERMINAL_PERMISSIVE, ACQUIRE_TERMINAL_TRY, ACQUIRE_TERMINAL_FORCE, ACQUIRE_TERMINAL_WAIT)); |
288a74cc | 374 | |
8854d795 LP |
375 | /* We use inotify to be notified when the tty is closed. We create the watch before checking if we can actually |
376 | * acquire it, so that we don't lose any event. | |
288a74cc | 377 | * |
8854d795 LP |
378 | * Note: strictly speaking this actually watches for the device being closed, it does *not* really watch |
379 | * whether a tty loses its controlling process. However, unless some rogue process uses TIOCNOTTY on /dev/tty | |
f95dbcc2 ZJS |
380 | * *after* closing its tty otherwise this will not become a problem. As long as the administrator makes sure to |
381 | * not configure any service on the same tty as an untrusted user this should not be a problem. (Which they | |
8854d795 LP |
382 | * probably should not do anyway.) */ |
383 | ||
384 | if ((flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_WAIT) { | |
288a74cc | 385 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); |
8854d795 LP |
386 | if (notify < 0) |
387 | return -errno; | |
288a74cc RC |
388 | |
389 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
8854d795 LP |
390 | if (wd < 0) |
391 | return -errno; | |
392 | ||
393 | if (timeout != USEC_INFINITY) | |
394 | ts = now(CLOCK_MONOTONIC); | |
288a74cc RC |
395 | } |
396 | ||
397 | for (;;) { | |
398 | struct sigaction sa_old, sa_new = { | |
399 | .sa_handler = SIG_IGN, | |
400 | .sa_flags = SA_RESTART, | |
401 | }; | |
402 | ||
403 | if (notify >= 0) { | |
404 | r = flush_fd(notify); | |
405 | if (r < 0) | |
8854d795 | 406 | return r; |
288a74cc RC |
407 | } |
408 | ||
8854d795 LP |
409 | /* We pass here O_NOCTTY only so that we can check the return value TIOCSCTTY and have a reliable way |
410 | * to figure out if we successfully became the controlling process of the tty */ | |
288a74cc RC |
411 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); |
412 | if (fd < 0) | |
413 | return fd; | |
414 | ||
8854d795 | 415 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed if we already own the tty. */ |
288a74cc RC |
416 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); |
417 | ||
418 | /* First, try to get the tty */ | |
8854d795 LP |
419 | r = ioctl(fd, TIOCSCTTY, |
420 | (flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_FORCE) < 0 ? -errno : 0; | |
288a74cc | 421 | |
8854d795 | 422 | /* Reset signal handler to old value */ |
288a74cc RC |
423 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); |
424 | ||
8854d795 LP |
425 | /* Success? Exit the loop now! */ |
426 | if (r >= 0) | |
427 | break; | |
288a74cc | 428 | |
8854d795 LP |
429 | /* Any failure besides -EPERM? Fail, regardless of the mode. */ |
430 | if (r != -EPERM) | |
431 | return r; | |
288a74cc | 432 | |
8854d795 LP |
433 | if (flags & ACQUIRE_TERMINAL_PERMISSIVE) /* If we are in permissive mode, then EPERM is fine, turn this |
434 | * into a success. Note that EPERM is also returned if we | |
435 | * already are the owner of the TTY. */ | |
288a74cc RC |
436 | break; |
437 | ||
8854d795 LP |
438 | if (flags != ACQUIRE_TERMINAL_WAIT) /* If we are in TRY or FORCE mode, then propagate EPERM as EPERM */ |
439 | return r; | |
440 | ||
288a74cc | 441 | assert(notify >= 0); |
8854d795 | 442 | assert(wd >= 0); |
288a74cc RC |
443 | |
444 | for (;;) { | |
445 | union inotify_event_buffer buffer; | |
446 | struct inotify_event *e; | |
447 | ssize_t l; | |
448 | ||
449 | if (timeout != USEC_INFINITY) { | |
450 | usec_t n; | |
451 | ||
8854d795 LP |
452 | assert(ts != USEC_INFINITY); |
453 | ||
288a74cc | 454 | n = now(CLOCK_MONOTONIC); |
8854d795 LP |
455 | if (ts + timeout < n) |
456 | return -ETIMEDOUT; | |
288a74cc | 457 | |
f80da6f3 | 458 | r = fd_wait_for_event(notify, POLLIN, ts + timeout - n); |
288a74cc | 459 | if (r < 0) |
8854d795 LP |
460 | return r; |
461 | if (r == 0) | |
462 | return -ETIMEDOUT; | |
288a74cc RC |
463 | } |
464 | ||
465 | l = read(notify, &buffer, sizeof(buffer)); | |
466 | if (l < 0) { | |
3742095b | 467 | if (IN_SET(errno, EINTR, EAGAIN)) |
288a74cc RC |
468 | continue; |
469 | ||
8854d795 | 470 | return -errno; |
288a74cc RC |
471 | } |
472 | ||
473 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
8854d795 LP |
474 | if (e->mask & IN_Q_OVERFLOW) /* If we hit an inotify queue overflow, simply check if the terminal is up for grabs now. */ |
475 | break; | |
476 | ||
477 | if (e->wd != wd || !(e->mask & IN_CLOSE)) /* Safety checks */ | |
478 | return -EIO; | |
288a74cc RC |
479 | } |
480 | ||
481 | break; | |
482 | } | |
483 | ||
8854d795 LP |
484 | /* We close the tty fd here since if the old session ended our handle will be dead. It's important that |
485 | * we do this after sleeping, so that we don't enter an endless loop. */ | |
288a74cc RC |
486 | fd = safe_close(fd); |
487 | } | |
488 | ||
c10d6bdb | 489 | return TAKE_FD(fd); |
288a74cc RC |
490 | } |
491 | ||
492 | int release_terminal(void) { | |
493 | static const struct sigaction sa_new = { | |
494 | .sa_handler = SIG_IGN, | |
495 | .sa_flags = SA_RESTART, | |
496 | }; | |
497 | ||
498 | _cleanup_close_ int fd = -1; | |
499 | struct sigaction sa_old; | |
87964ec7 | 500 | int r; |
288a74cc | 501 | |
0a8b555c | 502 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
503 | if (fd < 0) |
504 | return -errno; | |
505 | ||
506 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
507 | * by our own TIOCNOTTY */ | |
508 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
509 | ||
87964ec7 | 510 | r = ioctl(fd, TIOCNOTTY) < 0 ? -errno : 0; |
288a74cc RC |
511 | |
512 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
513 | ||
514 | return r; | |
515 | } | |
516 | ||
517 | int terminal_vhangup_fd(int fd) { | |
518 | assert(fd >= 0); | |
519 | ||
520 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
521 | return -errno; | |
522 | ||
523 | return 0; | |
524 | } | |
525 | ||
526 | int terminal_vhangup(const char *name) { | |
527 | _cleanup_close_ int fd; | |
528 | ||
0a8b555c | 529 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
530 | if (fd < 0) |
531 | return fd; | |
532 | ||
533 | return terminal_vhangup_fd(fd); | |
534 | } | |
535 | ||
536 | int vt_disallocate(const char *name) { | |
1ba23931 | 537 | _cleanup_close_ int fd = -1; |
27458ed6 | 538 | const char *e, *n; |
288a74cc | 539 | unsigned u; |
1ba23931 | 540 | int r; |
288a74cc RC |
541 | |
542 | /* Deallocate the VT if possible. If not possible | |
543 | * (i.e. because it is the active one), at least clear it | |
544 | * entirely (including the scrollback buffer) */ | |
545 | ||
27458ed6 LP |
546 | e = path_startswith(name, "/dev/"); |
547 | if (!e) | |
288a74cc RC |
548 | return -EINVAL; |
549 | ||
550 | if (!tty_is_vc(name)) { | |
551 | /* So this is not a VT. I guess we cannot deallocate | |
552 | * it then. But let's at least clear the screen */ | |
553 | ||
554 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
555 | if (fd < 0) | |
556 | return fd; | |
557 | ||
558 | loop_write(fd, | |
559 | "\033[r" /* clear scrolling region */ | |
560 | "\033[H" /* move home */ | |
561 | "\033[2J", /* clear screen */ | |
562 | 10, false); | |
288a74cc RC |
563 | return 0; |
564 | } | |
565 | ||
27458ed6 LP |
566 | n = startswith(e, "tty"); |
567 | if (!n) | |
288a74cc RC |
568 | return -EINVAL; |
569 | ||
27458ed6 | 570 | r = safe_atou(n, &u); |
288a74cc RC |
571 | if (r < 0) |
572 | return r; | |
573 | ||
574 | if (u <= 0) | |
575 | return -EINVAL; | |
576 | ||
577 | /* Try to deallocate */ | |
0a8b555c | 578 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
579 | if (fd < 0) |
580 | return fd; | |
581 | ||
582 | r = ioctl(fd, VT_DISALLOCATE, u); | |
1ba23931 | 583 | fd = safe_close(fd); |
288a74cc RC |
584 | |
585 | if (r >= 0) | |
586 | return 0; | |
587 | ||
588 | if (errno != EBUSY) | |
589 | return -errno; | |
590 | ||
591 | /* Couldn't deallocate, so let's clear it fully with | |
592 | * scrollback */ | |
593 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
594 | if (fd < 0) | |
595 | return fd; | |
596 | ||
597 | loop_write(fd, | |
598 | "\033[r" /* clear scrolling region */ | |
599 | "\033[H" /* move home */ | |
600 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
601 | 10, false); | |
288a74cc RC |
602 | return 0; |
603 | } | |
604 | ||
288a74cc RC |
605 | int make_console_stdio(void) { |
606 | int fd, r; | |
607 | ||
608 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr */ | |
609 | ||
8854d795 | 610 | fd = acquire_terminal("/dev/console", ACQUIRE_TERMINAL_FORCE|ACQUIRE_TERMINAL_PERMISSIVE, USEC_INFINITY); |
288a74cc RC |
611 | if (fd < 0) |
612 | return log_error_errno(fd, "Failed to acquire terminal: %m"); | |
613 | ||
3d18b167 LP |
614 | r = reset_terminal_fd(fd, true); |
615 | if (r < 0) | |
616 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
617 | ||
8bb2db73 | 618 | r = rearrange_stdio(fd, fd, fd); /* This invalidates 'fd' both on success and on failure. */ |
288a74cc | 619 | if (r < 0) |
8bb2db73 | 620 | return log_error_errno(r, "Failed to make terminal stdin/stdout/stderr: %m"); |
288a74cc | 621 | |
c6063244 LP |
622 | reset_terminal_feature_caches(); |
623 | ||
288a74cc RC |
624 | return 0; |
625 | } | |
626 | ||
288a74cc RC |
627 | bool tty_is_vc(const char *tty) { |
628 | assert(tty); | |
629 | ||
630 | return vtnr_from_tty(tty) >= 0; | |
631 | } | |
632 | ||
633 | bool tty_is_console(const char *tty) { | |
634 | assert(tty); | |
635 | ||
a119ec7c | 636 | return streq(skip_dev_prefix(tty), "console"); |
288a74cc RC |
637 | } |
638 | ||
639 | int vtnr_from_tty(const char *tty) { | |
640 | int i, r; | |
641 | ||
642 | assert(tty); | |
643 | ||
a119ec7c | 644 | tty = skip_dev_prefix(tty); |
288a74cc RC |
645 | |
646 | if (!startswith(tty, "tty") ) | |
647 | return -EINVAL; | |
648 | ||
649 | if (tty[3] < '0' || tty[3] > '9') | |
650 | return -EINVAL; | |
651 | ||
652 | r = safe_atoi(tty+3, &i); | |
653 | if (r < 0) | |
654 | return r; | |
655 | ||
656 | if (i < 0 || i > 63) | |
657 | return -EINVAL; | |
658 | ||
659 | return i; | |
660 | } | |
661 | ||
7b912648 LP |
662 | int resolve_dev_console(char **ret) { |
663 | _cleanup_free_ char *active = NULL; | |
288a74cc | 664 | char *tty; |
7b912648 | 665 | int r; |
288a74cc | 666 | |
7b912648 LP |
667 | assert(ret); |
668 | ||
669 | /* Resolve where /dev/console is pointing to, if /sys is actually ours (i.e. not read-only-mounted which is a | |
670 | * sign for container setups) */ | |
288a74cc RC |
671 | |
672 | if (path_is_read_only_fs("/sys") > 0) | |
7b912648 | 673 | return -ENOMEDIUM; |
288a74cc | 674 | |
7b912648 LP |
675 | r = read_one_line_file("/sys/class/tty/console/active", &active); |
676 | if (r < 0) | |
677 | return r; | |
288a74cc | 678 | |
7b912648 LP |
679 | /* If multiple log outputs are configured the last one is what /dev/console points to */ |
680 | tty = strrchr(active, ' '); | |
288a74cc RC |
681 | if (tty) |
682 | tty++; | |
683 | else | |
7b912648 | 684 | tty = active; |
288a74cc RC |
685 | |
686 | if (streq(tty, "tty0")) { | |
7b912648 | 687 | active = mfree(active); |
288a74cc RC |
688 | |
689 | /* Get the active VC (e.g. tty1) */ | |
7b912648 LP |
690 | r = read_one_line_file("/sys/class/tty/tty0/active", &active); |
691 | if (r < 0) | |
692 | return r; | |
693 | ||
694 | tty = active; | |
695 | } | |
696 | ||
ae2a15bc LP |
697 | if (tty == active) |
698 | *ret = TAKE_PTR(active); | |
699 | else { | |
7b912648 LP |
700 | char *tmp; |
701 | ||
702 | tmp = strdup(tty); | |
703 | if (!tmp) | |
704 | return -ENOMEM; | |
705 | ||
706 | *ret = tmp; | |
288a74cc RC |
707 | } |
708 | ||
7b912648 | 709 | return 0; |
288a74cc RC |
710 | } |
711 | ||
bef41af2 LP |
712 | int get_kernel_consoles(char ***ret) { |
713 | _cleanup_strv_free_ char **l = NULL; | |
6af62124 | 714 | _cleanup_free_ char *line = NULL; |
bef41af2 | 715 | const char *p; |
6af62124 WF |
716 | int r; |
717 | ||
bef41af2 LP |
718 | assert(ret); |
719 | ||
f95dbcc2 | 720 | /* If /sys is mounted read-only this means we are running in some kind of container environment. In that |
bef41af2 LP |
721 | * case /sys would reflect the host system, not us, hence ignore the data we can read from it. */ |
722 | if (path_is_read_only_fs("/sys") > 0) | |
723 | goto fallback; | |
6af62124 WF |
724 | |
725 | r = read_one_line_file("/sys/class/tty/console/active", &line); | |
726 | if (r < 0) | |
727 | return r; | |
728 | ||
bef41af2 | 729 | p = line; |
6af62124 WF |
730 | for (;;) { |
731 | _cleanup_free_ char *tty = NULL; | |
732 | char *path; | |
733 | ||
bef41af2 | 734 | r = extract_first_word(&p, &tty, NULL, 0); |
6af62124 WF |
735 | if (r < 0) |
736 | return r; | |
737 | if (r == 0) | |
738 | break; | |
739 | ||
740 | if (streq(tty, "tty0")) { | |
741 | tty = mfree(tty); | |
742 | r = read_one_line_file("/sys/class/tty/tty0/active", &tty); | |
743 | if (r < 0) | |
744 | return r; | |
745 | } | |
746 | ||
747 | path = strappend("/dev/", tty); | |
748 | if (!path) | |
749 | return -ENOMEM; | |
750 | ||
751 | if (access(path, F_OK) < 0) { | |
752 | log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path); | |
753 | free(path); | |
754 | continue; | |
755 | } | |
756 | ||
bef41af2 | 757 | r = strv_consume(&l, path); |
6af62124 WF |
758 | if (r < 0) |
759 | return r; | |
760 | } | |
761 | ||
bef41af2 | 762 | if (strv_isempty(l)) { |
6af62124 | 763 | log_debug("No devices found for system console"); |
bef41af2 | 764 | goto fallback; |
6af62124 WF |
765 | } |
766 | ||
ae2a15bc | 767 | *ret = TAKE_PTR(l); |
bef41af2 LP |
768 | |
769 | return 0; | |
770 | ||
771 | fallback: | |
772 | r = strv_extend(&l, "/dev/console"); | |
773 | if (r < 0) | |
774 | return r; | |
775 | ||
ae2a15bc | 776 | *ret = TAKE_PTR(l); |
bef41af2 | 777 | |
6af62124 WF |
778 | return 0; |
779 | } | |
780 | ||
288a74cc | 781 | bool tty_is_vc_resolve(const char *tty) { |
7b912648 | 782 | _cleanup_free_ char *resolved = NULL; |
288a74cc RC |
783 | |
784 | assert(tty); | |
785 | ||
a119ec7c | 786 | tty = skip_dev_prefix(tty); |
288a74cc RC |
787 | |
788 | if (streq(tty, "console")) { | |
7b912648 | 789 | if (resolve_dev_console(&resolved) < 0) |
288a74cc | 790 | return false; |
7b912648 LP |
791 | |
792 | tty = resolved; | |
288a74cc RC |
793 | } |
794 | ||
795 | return tty_is_vc(tty); | |
796 | } | |
797 | ||
798 | const char *default_term_for_tty(const char *tty) { | |
6af760f3 | 799 | return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220"; |
288a74cc RC |
800 | } |
801 | ||
802 | int fd_columns(int fd) { | |
803 | struct winsize ws = {}; | |
804 | ||
805 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
806 | return -errno; | |
807 | ||
808 | if (ws.ws_col <= 0) | |
809 | return -EIO; | |
810 | ||
811 | return ws.ws_col; | |
812 | } | |
813 | ||
814 | unsigned columns(void) { | |
815 | const char *e; | |
816 | int c; | |
817 | ||
c6063244 | 818 | if (cached_columns > 0) |
288a74cc RC |
819 | return cached_columns; |
820 | ||
821 | c = 0; | |
822 | e = getenv("COLUMNS"); | |
823 | if (e) | |
824 | (void) safe_atoi(e, &c); | |
825 | ||
826 | if (c <= 0) | |
827 | c = fd_columns(STDOUT_FILENO); | |
828 | ||
829 | if (c <= 0) | |
830 | c = 80; | |
831 | ||
832 | cached_columns = c; | |
833 | return cached_columns; | |
834 | } | |
835 | ||
836 | int fd_lines(int fd) { | |
837 | struct winsize ws = {}; | |
838 | ||
839 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
840 | return -errno; | |
841 | ||
842 | if (ws.ws_row <= 0) | |
843 | return -EIO; | |
844 | ||
845 | return ws.ws_row; | |
846 | } | |
847 | ||
848 | unsigned lines(void) { | |
849 | const char *e; | |
850 | int l; | |
851 | ||
c6063244 | 852 | if (cached_lines > 0) |
288a74cc RC |
853 | return cached_lines; |
854 | ||
855 | l = 0; | |
856 | e = getenv("LINES"); | |
857 | if (e) | |
858 | (void) safe_atoi(e, &l); | |
859 | ||
860 | if (l <= 0) | |
861 | l = fd_lines(STDOUT_FILENO); | |
862 | ||
863 | if (l <= 0) | |
864 | l = 24; | |
865 | ||
866 | cached_lines = l; | |
867 | return cached_lines; | |
868 | } | |
869 | ||
870 | /* intended to be used as a SIGWINCH sighandler */ | |
871 | void columns_lines_cache_reset(int signum) { | |
872 | cached_columns = 0; | |
873 | cached_lines = 0; | |
874 | } | |
875 | ||
c6063244 LP |
876 | void reset_terminal_feature_caches(void) { |
877 | cached_columns = 0; | |
878 | cached_lines = 0; | |
879 | ||
880 | cached_colors_enabled = -1; | |
881 | cached_underline_enabled = -1; | |
882 | cached_on_tty = -1; | |
883 | } | |
288a74cc | 884 | |
c6063244 LP |
885 | bool on_tty(void) { |
886 | if (cached_on_tty < 0) | |
288a74cc RC |
887 | cached_on_tty = isatty(STDOUT_FILENO) > 0; |
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 | ||
977 | int get_ctty(pid_t pid, dev_t *_devnr, char **r) { | |
fbd0b64f | 978 | char fn[STRLEN("/dev/char/") + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL; |
288a74cc RC |
979 | _cleanup_free_ char *s = NULL; |
980 | const char *p; | |
981 | dev_t devnr; | |
982 | int k; | |
983 | ||
984 | assert(r); | |
985 | ||
986 | k = get_ctty_devnr(pid, &devnr); | |
987 | if (k < 0) | |
988 | return k; | |
989 | ||
990 | sprintf(fn, "/dev/char/%u:%u", major(devnr), minor(devnr)); | |
991 | ||
992 | k = readlink_malloc(fn, &s); | |
993 | if (k < 0) { | |
994 | ||
995 | if (k != -ENOENT) | |
996 | return k; | |
997 | ||
998 | /* This is an ugly hack */ | |
999 | if (major(devnr) == 136) { | |
1000 | if (asprintf(&b, "pts/%u", minor(devnr)) < 0) | |
1001 | return -ENOMEM; | |
1002 | } else { | |
1003 | /* Probably something like the ptys which have no | |
1004 | * symlink in /dev/char. Let's return something | |
1005 | * vaguely useful. */ | |
1006 | ||
1007 | b = strdup(fn + 5); | |
1008 | if (!b) | |
1009 | return -ENOMEM; | |
1010 | } | |
1011 | } else { | |
1012 | if (startswith(s, "/dev/")) | |
1013 | p = s + 5; | |
1014 | else if (startswith(s, "../")) | |
1015 | p = s + 3; | |
1016 | else | |
1017 | p = s; | |
1018 | ||
1019 | b = strdup(p); | |
1020 | if (!b) | |
1021 | return -ENOMEM; | |
1022 | } | |
1023 | ||
1024 | *r = b; | |
1025 | if (_devnr) | |
1026 | *_devnr = devnr; | |
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 | ||
4c253ed1 LP |
1092 | r = safe_fork("(sd-openpt)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child); |
1093 | if (r < 0) | |
1094 | return r; | |
1095 | if (r == 0) { | |
66cb2fde LP |
1096 | int master; |
1097 | ||
1098 | pair[0] = safe_close(pair[0]); | |
1099 | ||
1100 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1101 | if (r < 0) | |
1102 | _exit(EXIT_FAILURE); | |
1103 | ||
1104 | master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); | |
1105 | if (master < 0) | |
1106 | _exit(EXIT_FAILURE); | |
1107 | ||
1108 | if (unlockpt(master) < 0) | |
1109 | _exit(EXIT_FAILURE); | |
1110 | ||
1111 | if (send_one_fd(pair[1], master, 0) < 0) | |
1112 | _exit(EXIT_FAILURE); | |
1113 | ||
1114 | _exit(EXIT_SUCCESS); | |
1115 | } | |
1116 | ||
1117 | pair[1] = safe_close(pair[1]); | |
1118 | ||
2e87a1fd | 1119 | r = wait_for_terminate_and_check("(sd-openpt)", child, 0); |
66cb2fde LP |
1120 | if (r < 0) |
1121 | return r; | |
2e87a1fd | 1122 | if (r != EXIT_SUCCESS) |
66cb2fde LP |
1123 | return -EIO; |
1124 | ||
1125 | return receive_one_fd(pair[0], 0); | |
1126 | } | |
40e1f4ea LP |
1127 | |
1128 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
1129 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1130 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
40e1f4ea LP |
1131 | pid_t child; |
1132 | int r; | |
1133 | ||
1134 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1135 | if (r < 0) | |
1136 | return r; | |
1137 | ||
1138 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1139 | return -errno; | |
1140 | ||
4c253ed1 LP |
1141 | r = safe_fork("(sd-terminal)", FORK_RESET_SIGNALS|FORK_DEATHSIG, &child); |
1142 | if (r < 0) | |
1143 | return r; | |
1144 | if (r == 0) { | |
40e1f4ea LP |
1145 | int master; |
1146 | ||
1147 | pair[0] = safe_close(pair[0]); | |
1148 | ||
1149 | r = namespace_enter(pidnsfd, mntnsfd, -1, usernsfd, rootfd); | |
1150 | if (r < 0) | |
1151 | _exit(EXIT_FAILURE); | |
1152 | ||
1153 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); | |
1154 | if (master < 0) | |
1155 | _exit(EXIT_FAILURE); | |
1156 | ||
1157 | if (send_one_fd(pair[1], master, 0) < 0) | |
1158 | _exit(EXIT_FAILURE); | |
1159 | ||
1160 | _exit(EXIT_SUCCESS); | |
1161 | } | |
1162 | ||
1163 | pair[1] = safe_close(pair[1]); | |
1164 | ||
2e87a1fd | 1165 | r = wait_for_terminate_and_check("(sd-terminal)", child, 0); |
40e1f4ea LP |
1166 | if (r < 0) |
1167 | return r; | |
2e87a1fd | 1168 | if (r != EXIT_SUCCESS) |
40e1f4ea LP |
1169 | return -EIO; |
1170 | ||
1171 | return receive_one_fd(pair[0], 0); | |
1172 | } | |
40c9fe4c | 1173 | |
158fbf76 | 1174 | static bool getenv_terminal_is_dumb(void) { |
ac96418b LP |
1175 | const char *e; |
1176 | ||
ac96418b LP |
1177 | e = getenv("TERM"); |
1178 | if (!e) | |
1179 | return true; | |
1180 | ||
1181 | return streq(e, "dumb"); | |
1182 | } | |
1183 | ||
158fbf76 ZJS |
1184 | bool terminal_is_dumb(void) { |
1185 | if (!on_tty()) | |
1186 | return true; | |
1187 | ||
1188 | return getenv_terminal_is_dumb(); | |
1189 | } | |
1190 | ||
40c9fe4c | 1191 | bool colors_enabled(void) { |
40c9fe4c | 1192 | |
0295642d | 1193 | /* Returns true if colors are considered supported on our stdout. For that we check $SYSTEMD_COLORS first |
f95dbcc2 | 1194 | * (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 |
1195 | * 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 |
1196 | * we are PID 1 then we do not check whether we are connected to a TTY, because we don't keep /dev/console open | |
1197 | * continously due to fear of SAK, and hence things are a bit weird. */ | |
1198 | ||
c6063244 | 1199 | if (cached_colors_enabled < 0) { |
acf553b0 | 1200 | int val; |
ae5b3958 | 1201 | |
acf553b0 ZJS |
1202 | val = getenv_bool("SYSTEMD_COLORS"); |
1203 | if (val >= 0) | |
c6063244 | 1204 | cached_colors_enabled = val; |
df0ff127 | 1205 | else if (getpid_cached() == 1) |
158fbf76 | 1206 | /* PID1 outputs to the console without holding it open all the time */ |
c6063244 | 1207 | cached_colors_enabled = !getenv_terminal_is_dumb(); |
ae5b3958 | 1208 | else |
c6063244 | 1209 | cached_colors_enabled = !terminal_is_dumb(); |
40c9fe4c JS |
1210 | } |
1211 | ||
c6063244 | 1212 | return cached_colors_enabled; |
40c9fe4c | 1213 | } |
c83f349c | 1214 | |
c2b32159 LP |
1215 | bool dev_console_colors_enabled(void) { |
1216 | _cleanup_free_ char *s = NULL; | |
1217 | int b; | |
1218 | ||
1219 | /* Returns true if we assume that color is supported on /dev/console. | |
1220 | * | |
1221 | * For that we first check if we explicitly got told to use colors or not, by checking $SYSTEMD_COLORS. If that | |
f95dbcc2 ZJS |
1222 | * isn't set we check whether PID 1 has $TERM set, and if not, whether TERM is set on the kernel command |
1223 | * line. If we find $TERM set we assume color if it's not set to "dumb", similarly to how regular | |
c2b32159 LP |
1224 | * colors_enabled() operates. */ |
1225 | ||
1226 | b = getenv_bool("SYSTEMD_COLORS"); | |
1227 | if (b >= 0) | |
1228 | return b; | |
1229 | ||
1230 | if (getenv_for_pid(1, "TERM", &s) <= 0) | |
1231 | (void) proc_cmdline_get_key("TERM", 0, &s); | |
1232 | ||
1233 | return !streq_ptr(s, "dumb"); | |
1234 | } | |
1235 | ||
526664f6 | 1236 | bool underline_enabled(void) { |
526664f6 | 1237 | |
c6063244 | 1238 | if (cached_underline_enabled < 0) { |
526664f6 LP |
1239 | |
1240 | /* The Linux console doesn't support underlining, turn it off, but only there. */ | |
1241 | ||
c6063244 LP |
1242 | if (colors_enabled()) |
1243 | cached_underline_enabled = !streq_ptr(getenv("TERM"), "linux"); | |
526664f6 | 1244 | else |
c6063244 | 1245 | cached_underline_enabled = false; |
526664f6 LP |
1246 | } |
1247 | ||
c6063244 | 1248 | return cached_underline_enabled; |
526664f6 LP |
1249 | } |
1250 | ||
c83f349c LP |
1251 | int vt_default_utf8(void) { |
1252 | _cleanup_free_ char *b = NULL; | |
1253 | int r; | |
1254 | ||
1255 | /* Read the default VT UTF8 setting from the kernel */ | |
1256 | ||
1257 | r = read_one_line_file("/sys/module/vt/parameters/default_utf8", &b); | |
1258 | if (r < 0) | |
1259 | return r; | |
1260 | ||
1261 | return parse_boolean(b); | |
1262 | } | |
1263 | ||
1264 | int vt_reset_keyboard(int fd) { | |
1265 | int kb; | |
1266 | ||
1267 | /* If we can't read the default, then default to unicode. It's 2017 after all. */ | |
1268 | kb = vt_default_utf8() != 0 ? K_UNICODE : K_XLATE; | |
1269 | ||
1270 | if (ioctl(fd, KDSKBMODE, kb) < 0) | |
1271 | return -errno; | |
1272 | ||
1273 | return 0; | |
1274 | } | |
23b27b39 LP |
1275 | |
1276 | static bool urlify_enabled(void) { | |
1277 | static int cached_urlify_enabled = -1; | |
1278 | ||
1279 | /* Unfortunately 'less' doesn't support links like this yet 😭, hence let's disable this as long as there's a | |
1280 | * pager in effect. Let's drop this check as soon as less got fixed a and enough time passed so that it's safe | |
1281 | * to assume that a link-enabled 'less' version has hit most installations. */ | |
1282 | ||
1283 | if (cached_urlify_enabled < 0) { | |
1284 | int val; | |
1285 | ||
1286 | val = getenv_bool("SYSTEMD_URLIFY"); | |
1287 | if (val >= 0) | |
1288 | cached_urlify_enabled = val; | |
1289 | else | |
1290 | cached_urlify_enabled = colors_enabled() && !pager_have(); | |
1291 | } | |
1292 | ||
1293 | return cached_urlify_enabled; | |
1294 | } | |
1295 | ||
1296 | int terminal_urlify(const char *url, const char *text, char **ret) { | |
1297 | char *n; | |
1298 | ||
1299 | assert(url); | |
1300 | ||
1301 | /* Takes an URL and a pretty string and formats it as clickable link for the terminal. See | |
1302 | * https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda for details. */ | |
1303 | ||
1304 | if (isempty(text)) | |
1305 | text = url; | |
1306 | ||
1307 | if (urlify_enabled()) | |
1308 | n = strjoin("\x1B]8;;", url, "\a", text, "\x1B]8;;\a"); | |
1309 | else | |
1310 | n = strdup(text); | |
1311 | if (!n) | |
1312 | return -ENOMEM; | |
1313 | ||
1314 | *ret = n; | |
1315 | return 0; | |
1316 | } | |
1317 | ||
1318 | int terminal_urlify_path(const char *path, const char *text, char **ret) { | |
1319 | _cleanup_free_ char *absolute = NULL; | |
1320 | struct utsname u; | |
1321 | const char *url; | |
1322 | int r; | |
1323 | ||
1324 | assert(path); | |
1325 | ||
cdacc27e ZJS |
1326 | /* Much like terminal_urlify() above, but takes a file system path as input |
1327 | * and turns it into a proper file:// URL first. */ | |
23b27b39 LP |
1328 | |
1329 | if (isempty(path)) | |
1330 | return -EINVAL; | |
1331 | ||
1332 | if (isempty(text)) | |
1333 | text = path; | |
1334 | ||
1335 | if (!urlify_enabled()) { | |
1336 | char *n; | |
1337 | ||
1338 | n = strdup(text); | |
1339 | if (!n) | |
1340 | return -ENOMEM; | |
1341 | ||
1342 | *ret = n; | |
1343 | return 0; | |
1344 | } | |
1345 | ||
1346 | if (uname(&u) < 0) | |
1347 | return -errno; | |
1348 | ||
1349 | if (!path_is_absolute(path)) { | |
1350 | r = path_make_absolute_cwd(path, &absolute); | |
1351 | if (r < 0) | |
1352 | return r; | |
1353 | ||
1354 | path = absolute; | |
1355 | } | |
1356 | ||
1357 | /* As suggested by https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda, let's include the local | |
1358 | * hostname here. Note that we don't use gethostname_malloc() or gethostname_strict() since we are interested | |
1359 | * in the raw string the kernel has set, whatever it may be, under the assumption that terminals are not overly | |
1360 | * careful with validating the strings either. */ | |
1361 | ||
1362 | url = strjoina("file://", u.nodename, path); | |
1363 | ||
1364 | return terminal_urlify(url, text, ret); | |
1365 | } | |
81f5e513 ZJS |
1366 | |
1367 | static int cat_file(const char *filename, bool newline) { | |
1368 | _cleanup_close_ int fd; | |
1369 | ||
1370 | fd = open(filename, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
1371 | if (fd < 0) | |
1372 | return -errno; | |
1373 | ||
1374 | printf("%s%s# %s%s\n", | |
1375 | newline ? "\n" : "", | |
1376 | ansi_highlight_blue(), | |
1377 | filename, | |
1378 | ansi_normal()); | |
1379 | fflush(stdout); | |
1380 | ||
1381 | return copy_bytes(fd, STDOUT_FILENO, (uint64_t) -1, 0); | |
1382 | } | |
1383 | ||
854a42fb | 1384 | int cat_files(const char *file, char **dropins, CatFlags flags) { |
81f5e513 ZJS |
1385 | char **path; |
1386 | int r; | |
1387 | ||
1388 | if (file) { | |
1389 | r = cat_file(file, false); | |
854a42fb ZJS |
1390 | if (r == -ENOENT && (flags & CAT_FLAGS_MAIN_FILE_OPTIONAL)) |
1391 | printf("%s# config file %s not found%s\n", | |
1392 | ansi_highlight_magenta(), | |
1393 | file, | |
1394 | ansi_normal()); | |
1395 | else if (r < 0) | |
81f5e513 ZJS |
1396 | return log_warning_errno(r, "Failed to cat %s: %m", file); |
1397 | } | |
1398 | ||
1399 | STRV_FOREACH(path, dropins) { | |
1400 | r = cat_file(*path, file || path != dropins); | |
1401 | if (r < 0) | |
1402 | return log_warning_errno(r, "Failed to cat %s: %m", *path); | |
1403 | } | |
1404 | ||
1405 | return 0; | |
1406 | } |