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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" | |
0cb8e3d1 | 35 | #include "namespace-util.h" |
6bedfcbb | 36 | #include "parse-util.h" |
c2b32159 LP |
37 | #include "path-util.h" |
38 | #include "proc-cmdline.h" | |
07630cea | 39 | #include "process-util.h" |
2583fbea | 40 | #include "socket-util.h" |
8fcde012 | 41 | #include "stat-util.h" |
07630cea | 42 | #include "string-util.h" |
6af62124 | 43 | #include "strv.h" |
3ffd4af2 | 44 | #include "terminal-util.h" |
07630cea LP |
45 | #include "time-util.h" |
46 | #include "util.h" | |
288a74cc RC |
47 | |
48 | static volatile unsigned cached_columns = 0; | |
49 | static volatile unsigned cached_lines = 0; | |
50 | ||
c6063244 LP |
51 | static volatile int cached_on_tty = -1; |
52 | static volatile int cached_colors_enabled = -1; | |
53 | static volatile int cached_underline_enabled = -1; | |
54 | ||
288a74cc RC |
55 | int chvt(int vt) { |
56 | _cleanup_close_ int fd; | |
57 | ||
0295642d LP |
58 | /* Switch to the specified vt number. If the VT is specified <= 0 switch to the VT the kernel log messages go, |
59 | * if that's configured. */ | |
60 | ||
0a8b555c | 61 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
62 | if (fd < 0) |
63 | return -errno; | |
64 | ||
b9e74c39 | 65 | if (vt <= 0) { |
288a74cc RC |
66 | int tiocl[2] = { |
67 | TIOCL_GETKMSGREDIRECT, | |
68 | 0 | |
69 | }; | |
70 | ||
71 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
72 | return -errno; | |
73 | ||
74 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
75 | } | |
76 | ||
77 | if (ioctl(fd, VT_ACTIVATE, vt) < 0) | |
78 | return -errno; | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { | |
715bcf36 LP |
84 | _cleanup_free_ char *line = NULL; |
85 | struct termios old_termios; | |
86 | int r; | |
288a74cc RC |
87 | |
88 | assert(f); | |
89 | assert(ret); | |
90 | ||
715bcf36 | 91 | /* If this is a terminal, then switch canonical mode off, so that we can read a single character */ |
288a74cc | 92 | if (tcgetattr(fileno(f), &old_termios) >= 0) { |
715bcf36 | 93 | struct termios new_termios = old_termios; |
288a74cc RC |
94 | |
95 | new_termios.c_lflag &= ~ICANON; | |
96 | new_termios.c_cc[VMIN] = 1; | |
97 | new_termios.c_cc[VTIME] = 0; | |
98 | ||
99 | if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) { | |
03a7dbea | 100 | char c; |
288a74cc RC |
101 | |
102 | if (t != USEC_INFINITY) { | |
103 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) { | |
d3f9790c | 104 | (void) tcsetattr(fileno(f), TCSADRAIN, &old_termios); |
288a74cc RC |
105 | return -ETIMEDOUT; |
106 | } | |
107 | } | |
108 | ||
03a7dbea | 109 | r = safe_fgetc(f, &c); |
d3f9790c | 110 | (void) tcsetattr(fileno(f), TCSADRAIN, &old_termios); |
d3f9790c LP |
111 | if (r < 0) |
112 | return r; | |
03a7dbea LP |
113 | if (r == 0) |
114 | return -EIO; | |
288a74cc RC |
115 | |
116 | if (need_nl) | |
117 | *need_nl = c != '\n'; | |
118 | ||
119 | *ret = c; | |
120 | return 0; | |
121 | } | |
122 | } | |
123 | ||
124 | if (t != USEC_INFINITY) { | |
125 | if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) | |
126 | return -ETIMEDOUT; | |
127 | } | |
128 | ||
715bcf36 | 129 | /* If this is not a terminal, then read a full line instead */ |
288a74cc | 130 | |
715bcf36 LP |
131 | r = read_line(f, 16, &line); /* longer than necessary, to eat up UTF-8 chars/vt100 key sequences */ |
132 | if (r < 0) | |
133 | return r; | |
134 | if (r == 0) | |
135 | return -EIO; | |
288a74cc RC |
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, ...) { | |
715bcf36 LP |
203 | int r; |
204 | ||
288a74cc RC |
205 | assert(ret); |
206 | assert(text); | |
207 | ||
208 | for (;;) { | |
715bcf36 | 209 | _cleanup_free_ char *line = NULL; |
288a74cc RC |
210 | va_list ap; |
211 | ||
7565bb98 | 212 | if (colors_enabled()) |
1fc464f6 | 213 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc RC |
214 | |
215 | va_start(ap, text); | |
216 | vprintf(text, ap); | |
217 | va_end(ap); | |
218 | ||
7565bb98 | 219 | if (colors_enabled()) |
1fc464f6 | 220 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
221 | |
222 | fflush(stdout); | |
223 | ||
715bcf36 LP |
224 | r = read_line(stdin, LONG_LINE_MAX, &line); |
225 | if (r < 0) | |
226 | return r; | |
227 | if (r == 0) | |
228 | return -EIO; | |
288a74cc | 229 | |
715bcf36 LP |
230 | if (!isempty(line)) { |
231 | *ret = TAKE_PTR(line); | |
288a74cc RC |
232 | return 0; |
233 | } | |
234 | } | |
235 | } | |
236 | ||
237 | int reset_terminal_fd(int fd, bool switch_to_text) { | |
238 | struct termios termios; | |
239 | int r = 0; | |
240 | ||
241 | /* Set terminal to some sane defaults */ | |
242 | ||
243 | assert(fd >= 0); | |
244 | ||
245 | /* We leave locked terminal attributes untouched, so that | |
246 | * Plymouth may set whatever it wants to set, and we don't | |
247 | * interfere with that. */ | |
248 | ||
249 | /* Disable exclusive mode, just in case */ | |
7d927c9a | 250 | (void) ioctl(fd, TIOCNXCL); |
288a74cc RC |
251 | |
252 | /* Switch to text mode */ | |
253 | if (switch_to_text) | |
7d927c9a | 254 | (void) ioctl(fd, KDSETMODE, KD_TEXT); |
288a74cc | 255 | |
73e669e0 | 256 | /* Set default keyboard mode */ |
c83f349c | 257 | (void) vt_reset_keyboard(fd); |
288a74cc RC |
258 | |
259 | if (tcgetattr(fd, &termios) < 0) { | |
260 | r = -errno; | |
261 | goto finish; | |
262 | } | |
263 | ||
264 | /* We only reset the stuff that matters to the software. How | |
265 | * hardware is set up we don't touch assuming that somebody | |
266 | * else will do that for us */ | |
267 | ||
268 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
269 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
270 | termios.c_oflag |= ONLCR; | |
271 | termios.c_cflag |= CREAD; | |
272 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
273 | ||
274 | termios.c_cc[VINTR] = 03; /* ^C */ | |
275 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
276 | termios.c_cc[VERASE] = 0177; | |
277 | termios.c_cc[VKILL] = 025; /* ^X */ | |
278 | termios.c_cc[VEOF] = 04; /* ^D */ | |
279 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
280 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
281 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
282 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
283 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
284 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
285 | termios.c_cc[VEOL] = 0; | |
286 | termios.c_cc[VEOL2] = 0; | |
287 | ||
288 | termios.c_cc[VTIME] = 0; | |
289 | termios.c_cc[VMIN] = 1; | |
290 | ||
291 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
292 | r = -errno; | |
293 | ||
294 | finish: | |
295 | /* Just in case, flush all crap out */ | |
7d927c9a | 296 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
297 | |
298 | return r; | |
299 | } | |
300 | ||
301 | int reset_terminal(const char *name) { | |
302 | _cleanup_close_ int fd = -1; | |
303 | ||
0a8b555c LP |
304 | /* We open the terminal with O_NONBLOCK here, to ensure we |
305 | * don't block on carrier if this is a terminal with carrier | |
306 | * configured. */ | |
307 | ||
308 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
309 | if (fd < 0) |
310 | return fd; | |
311 | ||
312 | return reset_terminal_fd(fd, true); | |
313 | } | |
314 | ||
315 | int open_terminal(const char *name, int mode) { | |
288a74cc | 316 | unsigned c = 0; |
87964ec7 | 317 | int fd; |
288a74cc RC |
318 | |
319 | /* | |
320 | * If a TTY is in the process of being closed opening it might | |
321 | * cause EIO. This is horribly awful, but unlikely to be | |
322 | * changed in the kernel. Hence we work around this problem by | |
323 | * retrying a couple of times. | |
324 | * | |
325 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
326 | */ | |
327 | ||
35bdab77 LP |
328 | if (mode & O_CREAT) |
329 | return -EINVAL; | |
288a74cc RC |
330 | |
331 | for (;;) { | |
332 | fd = open(name, mode, 0); | |
333 | if (fd >= 0) | |
334 | break; | |
335 | ||
336 | if (errno != EIO) | |
337 | return -errno; | |
338 | ||
339 | /* Max 1s in total */ | |
340 | if (c >= 20) | |
341 | return -errno; | |
342 | ||
343 | usleep(50 * USEC_PER_MSEC); | |
344 | c++; | |
345 | } | |
346 | ||
87964ec7 | 347 | if (isatty(fd) <= 0) { |
288a74cc RC |
348 | safe_close(fd); |
349 | return -ENOTTY; | |
350 | } | |
351 | ||
352 | return fd; | |
353 | } | |
354 | ||
355 | int acquire_terminal( | |
356 | const char *name, | |
8854d795 | 357 | AcquireTerminalFlags flags, |
288a74cc RC |
358 | usec_t timeout) { |
359 | ||
8854d795 LP |
360 | _cleanup_close_ int notify = -1, fd = -1; |
361 | usec_t ts = USEC_INFINITY; | |
362 | int r, wd = -1; | |
288a74cc RC |
363 | |
364 | assert(name); | |
8854d795 | 365 | assert(IN_SET(flags & ~ACQUIRE_TERMINAL_PERMISSIVE, ACQUIRE_TERMINAL_TRY, ACQUIRE_TERMINAL_FORCE, ACQUIRE_TERMINAL_WAIT)); |
288a74cc | 366 | |
8854d795 LP |
367 | /* We use inotify to be notified when the tty is closed. We create the watch before checking if we can actually |
368 | * acquire it, so that we don't lose any event. | |
288a74cc | 369 | * |
8854d795 LP |
370 | * Note: strictly speaking this actually watches for the device being closed, it does *not* really watch |
371 | * whether a tty loses its controlling process. However, unless some rogue process uses TIOCNOTTY on /dev/tty | |
f95dbcc2 ZJS |
372 | * *after* closing its tty otherwise this will not become a problem. As long as the administrator makes sure to |
373 | * not configure any service on the same tty as an untrusted user this should not be a problem. (Which they | |
8854d795 LP |
374 | * probably should not do anyway.) */ |
375 | ||
376 | if ((flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_WAIT) { | |
288a74cc | 377 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); |
8854d795 LP |
378 | if (notify < 0) |
379 | return -errno; | |
288a74cc RC |
380 | |
381 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
8854d795 LP |
382 | if (wd < 0) |
383 | return -errno; | |
384 | ||
385 | if (timeout != USEC_INFINITY) | |
386 | ts = now(CLOCK_MONOTONIC); | |
288a74cc RC |
387 | } |
388 | ||
389 | for (;;) { | |
390 | struct sigaction sa_old, sa_new = { | |
391 | .sa_handler = SIG_IGN, | |
392 | .sa_flags = SA_RESTART, | |
393 | }; | |
394 | ||
395 | if (notify >= 0) { | |
396 | r = flush_fd(notify); | |
397 | if (r < 0) | |
8854d795 | 398 | return r; |
288a74cc RC |
399 | } |
400 | ||
8854d795 LP |
401 | /* We pass here O_NOCTTY only so that we can check the return value TIOCSCTTY and have a reliable way |
402 | * to figure out if we successfully became the controlling process of the tty */ | |
288a74cc RC |
403 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); |
404 | if (fd < 0) | |
405 | return fd; | |
406 | ||
8854d795 | 407 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed if we already own the tty. */ |
288a74cc RC |
408 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); |
409 | ||
410 | /* First, try to get the tty */ | |
8854d795 LP |
411 | r = ioctl(fd, TIOCSCTTY, |
412 | (flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_FORCE) < 0 ? -errno : 0; | |
288a74cc | 413 | |
8854d795 | 414 | /* Reset signal handler to old value */ |
288a74cc RC |
415 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); |
416 | ||
8854d795 LP |
417 | /* Success? Exit the loop now! */ |
418 | if (r >= 0) | |
419 | break; | |
288a74cc | 420 | |
8854d795 LP |
421 | /* Any failure besides -EPERM? Fail, regardless of the mode. */ |
422 | if (r != -EPERM) | |
423 | return r; | |
288a74cc | 424 | |
8854d795 LP |
425 | if (flags & ACQUIRE_TERMINAL_PERMISSIVE) /* If we are in permissive mode, then EPERM is fine, turn this |
426 | * into a success. Note that EPERM is also returned if we | |
427 | * already are the owner of the TTY. */ | |
288a74cc RC |
428 | break; |
429 | ||
8854d795 LP |
430 | if (flags != ACQUIRE_TERMINAL_WAIT) /* If we are in TRY or FORCE mode, then propagate EPERM as EPERM */ |
431 | return r; | |
432 | ||
288a74cc | 433 | assert(notify >= 0); |
8854d795 | 434 | assert(wd >= 0); |
288a74cc RC |
435 | |
436 | for (;;) { | |
437 | union inotify_event_buffer buffer; | |
438 | struct inotify_event *e; | |
439 | ssize_t l; | |
440 | ||
441 | if (timeout != USEC_INFINITY) { | |
442 | usec_t n; | |
443 | ||
8854d795 LP |
444 | assert(ts != USEC_INFINITY); |
445 | ||
288a74cc | 446 | n = now(CLOCK_MONOTONIC); |
8854d795 LP |
447 | if (ts + timeout < n) |
448 | return -ETIMEDOUT; | |
288a74cc | 449 | |
f80da6f3 | 450 | r = fd_wait_for_event(notify, POLLIN, ts + timeout - n); |
288a74cc | 451 | if (r < 0) |
8854d795 LP |
452 | return r; |
453 | if (r == 0) | |
454 | return -ETIMEDOUT; | |
288a74cc RC |
455 | } |
456 | ||
457 | l = read(notify, &buffer, sizeof(buffer)); | |
458 | if (l < 0) { | |
3742095b | 459 | if (IN_SET(errno, EINTR, EAGAIN)) |
288a74cc RC |
460 | continue; |
461 | ||
8854d795 | 462 | return -errno; |
288a74cc RC |
463 | } |
464 | ||
465 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
8854d795 LP |
466 | if (e->mask & IN_Q_OVERFLOW) /* If we hit an inotify queue overflow, simply check if the terminal is up for grabs now. */ |
467 | break; | |
468 | ||
469 | if (e->wd != wd || !(e->mask & IN_CLOSE)) /* Safety checks */ | |
470 | return -EIO; | |
288a74cc RC |
471 | } |
472 | ||
473 | break; | |
474 | } | |
475 | ||
8854d795 LP |
476 | /* We close the tty fd here since if the old session ended our handle will be dead. It's important that |
477 | * we do this after sleeping, so that we don't enter an endless loop. */ | |
288a74cc RC |
478 | fd = safe_close(fd); |
479 | } | |
480 | ||
c10d6bdb | 481 | return TAKE_FD(fd); |
288a74cc RC |
482 | } |
483 | ||
484 | int release_terminal(void) { | |
485 | static const struct sigaction sa_new = { | |
486 | .sa_handler = SIG_IGN, | |
487 | .sa_flags = SA_RESTART, | |
488 | }; | |
489 | ||
490 | _cleanup_close_ int fd = -1; | |
491 | struct sigaction sa_old; | |
87964ec7 | 492 | int r; |
288a74cc | 493 | |
0a8b555c | 494 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
495 | if (fd < 0) |
496 | return -errno; | |
497 | ||
498 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
499 | * by our own TIOCNOTTY */ | |
500 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
501 | ||
87964ec7 | 502 | r = ioctl(fd, TIOCNOTTY) < 0 ? -errno : 0; |
288a74cc RC |
503 | |
504 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
505 | ||
506 | return r; | |
507 | } | |
508 | ||
509 | int terminal_vhangup_fd(int fd) { | |
510 | assert(fd >= 0); | |
511 | ||
512 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
513 | return -errno; | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | int terminal_vhangup(const char *name) { | |
519 | _cleanup_close_ int fd; | |
520 | ||
0a8b555c | 521 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
522 | if (fd < 0) |
523 | return fd; | |
524 | ||
525 | return terminal_vhangup_fd(fd); | |
526 | } | |
527 | ||
528 | int vt_disallocate(const char *name) { | |
1ba23931 | 529 | _cleanup_close_ int fd = -1; |
27458ed6 | 530 | const char *e, *n; |
288a74cc | 531 | unsigned u; |
1ba23931 | 532 | int r; |
288a74cc RC |
533 | |
534 | /* Deallocate the VT if possible. If not possible | |
535 | * (i.e. because it is the active one), at least clear it | |
536 | * entirely (including the scrollback buffer) */ | |
537 | ||
27458ed6 LP |
538 | e = path_startswith(name, "/dev/"); |
539 | if (!e) | |
288a74cc RC |
540 | return -EINVAL; |
541 | ||
542 | if (!tty_is_vc(name)) { | |
543 | /* So this is not a VT. I guess we cannot deallocate | |
544 | * it then. But let's at least clear the screen */ | |
545 | ||
546 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
547 | if (fd < 0) | |
548 | return fd; | |
549 | ||
550 | loop_write(fd, | |
551 | "\033[r" /* clear scrolling region */ | |
552 | "\033[H" /* move home */ | |
553 | "\033[2J", /* clear screen */ | |
554 | 10, false); | |
288a74cc RC |
555 | return 0; |
556 | } | |
557 | ||
27458ed6 LP |
558 | n = startswith(e, "tty"); |
559 | if (!n) | |
288a74cc RC |
560 | return -EINVAL; |
561 | ||
27458ed6 | 562 | r = safe_atou(n, &u); |
288a74cc RC |
563 | if (r < 0) |
564 | return r; | |
565 | ||
566 | if (u <= 0) | |
567 | return -EINVAL; | |
568 | ||
569 | /* Try to deallocate */ | |
0a8b555c | 570 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
571 | if (fd < 0) |
572 | return fd; | |
573 | ||
574 | r = ioctl(fd, VT_DISALLOCATE, u); | |
1ba23931 | 575 | fd = safe_close(fd); |
288a74cc RC |
576 | |
577 | if (r >= 0) | |
578 | return 0; | |
579 | ||
580 | if (errno != EBUSY) | |
581 | return -errno; | |
582 | ||
583 | /* Couldn't deallocate, so let's clear it fully with | |
584 | * scrollback */ | |
585 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); | |
586 | if (fd < 0) | |
587 | return fd; | |
588 | ||
589 | loop_write(fd, | |
590 | "\033[r" /* clear scrolling region */ | |
591 | "\033[H" /* move home */ | |
592 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
593 | 10, false); | |
288a74cc RC |
594 | return 0; |
595 | } | |
596 | ||
288a74cc RC |
597 | int make_console_stdio(void) { |
598 | int fd, r; | |
599 | ||
600 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr */ | |
601 | ||
8854d795 | 602 | fd = acquire_terminal("/dev/console", ACQUIRE_TERMINAL_FORCE|ACQUIRE_TERMINAL_PERMISSIVE, USEC_INFINITY); |
288a74cc RC |
603 | if (fd < 0) |
604 | return log_error_errno(fd, "Failed to acquire terminal: %m"); | |
605 | ||
3d18b167 LP |
606 | r = reset_terminal_fd(fd, true); |
607 | if (r < 0) | |
608 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
609 | ||
8bb2db73 | 610 | r = rearrange_stdio(fd, fd, fd); /* This invalidates 'fd' both on success and on failure. */ |
288a74cc | 611 | if (r < 0) |
8bb2db73 | 612 | return log_error_errno(r, "Failed to make terminal stdin/stdout/stderr: %m"); |
288a74cc | 613 | |
c6063244 LP |
614 | reset_terminal_feature_caches(); |
615 | ||
288a74cc RC |
616 | return 0; |
617 | } | |
618 | ||
288a74cc RC |
619 | bool tty_is_vc(const char *tty) { |
620 | assert(tty); | |
621 | ||
622 | return vtnr_from_tty(tty) >= 0; | |
623 | } | |
624 | ||
625 | bool tty_is_console(const char *tty) { | |
626 | assert(tty); | |
627 | ||
a119ec7c | 628 | return streq(skip_dev_prefix(tty), "console"); |
288a74cc RC |
629 | } |
630 | ||
631 | int vtnr_from_tty(const char *tty) { | |
632 | int i, r; | |
633 | ||
634 | assert(tty); | |
635 | ||
a119ec7c | 636 | tty = skip_dev_prefix(tty); |
288a74cc RC |
637 | |
638 | if (!startswith(tty, "tty") ) | |
639 | return -EINVAL; | |
640 | ||
641 | if (tty[3] < '0' || tty[3] > '9') | |
642 | return -EINVAL; | |
643 | ||
644 | r = safe_atoi(tty+3, &i); | |
645 | if (r < 0) | |
646 | return r; | |
647 | ||
648 | if (i < 0 || i > 63) | |
649 | return -EINVAL; | |
650 | ||
651 | return i; | |
652 | } | |
653 | ||
7b912648 LP |
654 | int resolve_dev_console(char **ret) { |
655 | _cleanup_free_ char *active = NULL; | |
288a74cc | 656 | char *tty; |
7b912648 | 657 | int r; |
288a74cc | 658 | |
7b912648 LP |
659 | assert(ret); |
660 | ||
661 | /* Resolve where /dev/console is pointing to, if /sys is actually ours (i.e. not read-only-mounted which is a | |
662 | * sign for container setups) */ | |
288a74cc RC |
663 | |
664 | if (path_is_read_only_fs("/sys") > 0) | |
7b912648 | 665 | return -ENOMEDIUM; |
288a74cc | 666 | |
7b912648 LP |
667 | r = read_one_line_file("/sys/class/tty/console/active", &active); |
668 | if (r < 0) | |
669 | return r; | |
288a74cc | 670 | |
7b912648 LP |
671 | /* If multiple log outputs are configured the last one is what /dev/console points to */ |
672 | tty = strrchr(active, ' '); | |
288a74cc RC |
673 | if (tty) |
674 | tty++; | |
675 | else | |
7b912648 | 676 | tty = active; |
288a74cc RC |
677 | |
678 | if (streq(tty, "tty0")) { | |
7b912648 | 679 | active = mfree(active); |
288a74cc RC |
680 | |
681 | /* Get the active VC (e.g. tty1) */ | |
7b912648 LP |
682 | r = read_one_line_file("/sys/class/tty/tty0/active", &active); |
683 | if (r < 0) | |
684 | return r; | |
685 | ||
686 | tty = active; | |
687 | } | |
688 | ||
ae2a15bc LP |
689 | if (tty == active) |
690 | *ret = TAKE_PTR(active); | |
691 | else { | |
7b912648 LP |
692 | char *tmp; |
693 | ||
694 | tmp = strdup(tty); | |
695 | if (!tmp) | |
696 | return -ENOMEM; | |
697 | ||
698 | *ret = tmp; | |
288a74cc RC |
699 | } |
700 | ||
7b912648 | 701 | return 0; |
288a74cc RC |
702 | } |
703 | ||
bef41af2 LP |
704 | int get_kernel_consoles(char ***ret) { |
705 | _cleanup_strv_free_ char **l = NULL; | |
6af62124 | 706 | _cleanup_free_ char *line = NULL; |
bef41af2 | 707 | const char *p; |
6af62124 WF |
708 | int r; |
709 | ||
bef41af2 LP |
710 | assert(ret); |
711 | ||
f95dbcc2 | 712 | /* If /sys is mounted read-only this means we are running in some kind of container environment. In that |
bef41af2 LP |
713 | * case /sys would reflect the host system, not us, hence ignore the data we can read from it. */ |
714 | if (path_is_read_only_fs("/sys") > 0) | |
715 | goto fallback; | |
6af62124 WF |
716 | |
717 | r = read_one_line_file("/sys/class/tty/console/active", &line); | |
718 | if (r < 0) | |
719 | return r; | |
720 | ||
bef41af2 | 721 | p = line; |
6af62124 WF |
722 | for (;;) { |
723 | _cleanup_free_ char *tty = NULL; | |
724 | char *path; | |
725 | ||
bef41af2 | 726 | r = extract_first_word(&p, &tty, NULL, 0); |
6af62124 WF |
727 | if (r < 0) |
728 | return r; | |
729 | if (r == 0) | |
730 | break; | |
731 | ||
732 | if (streq(tty, "tty0")) { | |
733 | tty = mfree(tty); | |
734 | r = read_one_line_file("/sys/class/tty/tty0/active", &tty); | |
735 | if (r < 0) | |
736 | return r; | |
737 | } | |
738 | ||
739 | path = strappend("/dev/", tty); | |
740 | if (!path) | |
741 | return -ENOMEM; | |
742 | ||
743 | if (access(path, F_OK) < 0) { | |
744 | log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path); | |
745 | free(path); | |
746 | continue; | |
747 | } | |
748 | ||
bef41af2 | 749 | r = strv_consume(&l, path); |
6af62124 WF |
750 | if (r < 0) |
751 | return r; | |
752 | } | |
753 | ||
bef41af2 | 754 | if (strv_isempty(l)) { |
6af62124 | 755 | log_debug("No devices found for system console"); |
bef41af2 | 756 | goto fallback; |
6af62124 WF |
757 | } |
758 | ||
ae2a15bc | 759 | *ret = TAKE_PTR(l); |
bef41af2 LP |
760 | |
761 | return 0; | |
762 | ||
763 | fallback: | |
764 | r = strv_extend(&l, "/dev/console"); | |
765 | if (r < 0) | |
766 | return r; | |
767 | ||
ae2a15bc | 768 | *ret = TAKE_PTR(l); |
bef41af2 | 769 | |
6af62124 WF |
770 | return 0; |
771 | } | |
772 | ||
288a74cc | 773 | bool tty_is_vc_resolve(const char *tty) { |
7b912648 | 774 | _cleanup_free_ char *resolved = NULL; |
288a74cc RC |
775 | |
776 | assert(tty); | |
777 | ||
a119ec7c | 778 | tty = skip_dev_prefix(tty); |
288a74cc RC |
779 | |
780 | if (streq(tty, "console")) { | |
7b912648 | 781 | if (resolve_dev_console(&resolved) < 0) |
288a74cc | 782 | return false; |
7b912648 LP |
783 | |
784 | tty = resolved; | |
288a74cc RC |
785 | } |
786 | ||
787 | return tty_is_vc(tty); | |
788 | } | |
789 | ||
790 | const char *default_term_for_tty(const char *tty) { | |
6af760f3 | 791 | return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220"; |
288a74cc RC |
792 | } |
793 | ||
794 | int fd_columns(int fd) { | |
795 | struct winsize ws = {}; | |
796 | ||
797 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
798 | return -errno; | |
799 | ||
800 | if (ws.ws_col <= 0) | |
801 | return -EIO; | |
802 | ||
803 | return ws.ws_col; | |
804 | } | |
805 | ||
806 | unsigned columns(void) { | |
807 | const char *e; | |
808 | int c; | |
809 | ||
c6063244 | 810 | if (cached_columns > 0) |
288a74cc RC |
811 | return cached_columns; |
812 | ||
813 | c = 0; | |
814 | e = getenv("COLUMNS"); | |
815 | if (e) | |
816 | (void) safe_atoi(e, &c); | |
817 | ||
d09a7135 | 818 | if (c <= 0 || c > USHRT_MAX) { |
288a74cc | 819 | c = fd_columns(STDOUT_FILENO); |
d09a7135 LP |
820 | if (c <= 0) |
821 | c = 80; | |
822 | } | |
288a74cc RC |
823 | |
824 | cached_columns = c; | |
825 | return cached_columns; | |
826 | } | |
827 | ||
828 | int fd_lines(int fd) { | |
829 | struct winsize ws = {}; | |
830 | ||
831 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
832 | return -errno; | |
833 | ||
834 | if (ws.ws_row <= 0) | |
835 | return -EIO; | |
836 | ||
837 | return ws.ws_row; | |
838 | } | |
839 | ||
840 | unsigned lines(void) { | |
841 | const char *e; | |
842 | int l; | |
843 | ||
c6063244 | 844 | if (cached_lines > 0) |
288a74cc RC |
845 | return cached_lines; |
846 | ||
847 | l = 0; | |
848 | e = getenv("LINES"); | |
849 | if (e) | |
850 | (void) safe_atoi(e, &l); | |
851 | ||
d09a7135 | 852 | if (l <= 0 || l > USHRT_MAX) { |
288a74cc | 853 | l = fd_lines(STDOUT_FILENO); |
d09a7135 LP |
854 | if (l <= 0) |
855 | l = 24; | |
856 | } | |
288a74cc RC |
857 | |
858 | cached_lines = l; | |
859 | return cached_lines; | |
860 | } | |
861 | ||
862 | /* intended to be used as a SIGWINCH sighandler */ | |
863 | void columns_lines_cache_reset(int signum) { | |
864 | cached_columns = 0; | |
865 | cached_lines = 0; | |
866 | } | |
867 | ||
c6063244 LP |
868 | void reset_terminal_feature_caches(void) { |
869 | cached_columns = 0; | |
870 | cached_lines = 0; | |
871 | ||
872 | cached_colors_enabled = -1; | |
873 | cached_underline_enabled = -1; | |
874 | cached_on_tty = -1; | |
875 | } | |
288a74cc | 876 | |
c6063244 | 877 | bool on_tty(void) { |
8cd0356e LP |
878 | |
879 | /* We check both stdout and stderr, so that situations where pipes on the shell are used are reliably | |
880 | * recognized, regardless if only the output or the errors are piped to some place. Since on_tty() is generally | |
881 | * used to default to a safer, non-interactive, non-color mode of operation it's probably good to be defensive | |
882 | * here, and check for both. Note that we don't check for STDIN_FILENO, because it should fine to use fancy | |
883 | * terminal functionality when outputting stuff, even if the input is piped to us. */ | |
884 | ||
c6063244 | 885 | if (cached_on_tty < 0) |
8cd0356e LP |
886 | cached_on_tty = |
887 | isatty(STDOUT_FILENO) > 0 && | |
888 | isatty(STDERR_FILENO) > 0; | |
288a74cc RC |
889 | |
890 | return cached_on_tty; | |
891 | } | |
892 | ||
288a74cc | 893 | int getttyname_malloc(int fd, char **ret) { |
30222f4b | 894 | char path[PATH_MAX], *c; /* PATH_MAX is counted *with* the trailing NUL byte */ |
288a74cc RC |
895 | int r; |
896 | ||
897 | assert(fd >= 0); | |
898 | assert(ret); | |
899 | ||
30222f4b ZJS |
900 | r = ttyname_r(fd, path, sizeof path); /* positive error */ |
901 | assert(r >= 0); | |
902 | if (r == ERANGE) | |
903 | return -ENAMETOOLONG; | |
904 | if (r > 0) | |
905 | return -r; | |
288a74cc | 906 | |
30222f4b ZJS |
907 | c = strdup(skip_dev_prefix(path)); |
908 | if (!c) | |
909 | return -ENOMEM; | |
288a74cc | 910 | |
30222f4b | 911 | *ret = c; |
288a74cc RC |
912 | return 0; |
913 | } | |
914 | ||
f171decd LP |
915 | int getttyname_harder(int fd, char **ret) { |
916 | _cleanup_free_ char *s = NULL; | |
917 | int r; | |
288a74cc | 918 | |
f171decd LP |
919 | r = getttyname_malloc(fd, &s); |
920 | if (r < 0) | |
921 | return r; | |
288a74cc | 922 | |
f171decd LP |
923 | if (streq(s, "tty")) |
924 | return get_ctty(0, NULL, ret); | |
288a74cc | 925 | |
f171decd | 926 | *ret = TAKE_PTR(s); |
288a74cc RC |
927 | return 0; |
928 | } | |
929 | ||
930 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
931 | int r; | |
932 | _cleanup_free_ char *line = NULL; | |
933 | const char *p; | |
934 | unsigned long ttynr; | |
935 | ||
936 | assert(pid >= 0); | |
937 | ||
938 | p = procfs_file_alloca(pid, "stat"); | |
939 | r = read_one_line_file(p, &line); | |
940 | if (r < 0) | |
941 | return r; | |
942 | ||
943 | p = strrchr(line, ')'); | |
944 | if (!p) | |
945 | return -EIO; | |
946 | ||
947 | p++; | |
948 | ||
949 | if (sscanf(p, " " | |
950 | "%*c " /* state */ | |
951 | "%*d " /* ppid */ | |
952 | "%*d " /* pgrp */ | |
953 | "%*d " /* session */ | |
954 | "%lu ", /* ttynr */ | |
955 | &ttynr) != 1) | |
956 | return -EIO; | |
957 | ||
958 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
cfeaa44a | 959 | return -ENXIO; |
288a74cc RC |
960 | |
961 | if (d) | |
962 | *d = (dev_t) ttynr; | |
963 | ||
964 | return 0; | |
965 | } | |
966 | ||
54b22b26 LP |
967 | int get_ctty(pid_t pid, dev_t *ret_devnr, char **ret) { |
968 | _cleanup_free_ char *fn = NULL, *b = NULL; | |
288a74cc | 969 | dev_t devnr; |
54b22b26 | 970 | int r; |
288a74cc | 971 | |
54b22b26 LP |
972 | r = get_ctty_devnr(pid, &devnr); |
973 | if (r < 0) | |
974 | return r; | |
288a74cc | 975 | |
54b22b26 LP |
976 | r = device_path_make_canonical(S_IFCHR, devnr, &fn); |
977 | if (r < 0) { | |
978 | if (r != -ENOENT) /* No symlink for this in /dev/char/? */ | |
979 | return r; | |
288a74cc | 980 | |
288a74cc | 981 | if (major(devnr) == 136) { |
54b22b26 LP |
982 | /* This is an ugly hack: PTY devices are not listed in /dev/char/, as they don't follow the |
983 | * Linux device model. This means we have no nice way to match them up against their actual | |
984 | * device node. Let's hence do the check by the fixed, assigned major number. Normally we try | |
985 | * to avoid such fixed major/minor matches, but there appears to nother nice way to handle | |
986 | * this. */ | |
987 | ||
288a74cc RC |
988 | if (asprintf(&b, "pts/%u", minor(devnr)) < 0) |
989 | return -ENOMEM; | |
990 | } else { | |
54b22b26 LP |
991 | /* Probably something similar to the ptys which have no symlink in /dev/char/. Let's return |
992 | * something vaguely useful. */ | |
288a74cc | 993 | |
54b22b26 LP |
994 | r = device_path_make_major_minor(S_IFCHR, devnr, &fn); |
995 | if (r < 0) | |
996 | return r; | |
288a74cc | 997 | } |
54b22b26 | 998 | } |
288a74cc | 999 | |
54b22b26 LP |
1000 | if (!b) { |
1001 | const char *w; | |
1002 | ||
1003 | w = path_startswith(fn, "/dev/"); | |
1004 | if (w) { | |
1005 | b = strdup(w); | |
1006 | if (!b) | |
1007 | return -ENOMEM; | |
1008 | } else | |
1009 | b = TAKE_PTR(fn); | |
288a74cc RC |
1010 | } |
1011 | ||
54b22b26 LP |
1012 | if (ret) |
1013 | *ret = TAKE_PTR(b); | |
1014 | ||
1015 | if (ret_devnr) | |
1016 | *ret_devnr = devnr; | |
288a74cc RC |
1017 | |
1018 | return 0; | |
1019 | } | |
a07c35c3 | 1020 | |
66cb2fde LP |
1021 | int ptsname_malloc(int fd, char **ret) { |
1022 | size_t l = 100; | |
1023 | ||
1024 | assert(fd >= 0); | |
1025 | assert(ret); | |
1026 | ||
1027 | for (;;) { | |
1028 | char *c; | |
1029 | ||
1030 | c = new(char, l); | |
1031 | if (!c) | |
1032 | return -ENOMEM; | |
1033 | ||
1034 | if (ptsname_r(fd, c, l) == 0) { | |
1035 | *ret = c; | |
1036 | return 0; | |
1037 | } | |
1038 | if (errno != ERANGE) { | |
1039 | free(c); | |
1040 | return -errno; | |
1041 | } | |
1042 | ||
1043 | free(c); | |
1044 | l *= 2; | |
1045 | } | |
1046 | } | |
1047 | ||
a07c35c3 LP |
1048 | int ptsname_namespace(int pty, char **ret) { |
1049 | int no = -1, r; | |
1050 | ||
1051 | /* Like ptsname(), but doesn't assume that the path is | |
1052 | * accessible in the local namespace. */ | |
1053 | ||
1054 | r = ioctl(pty, TIOCGPTN, &no); | |
1055 | if (r < 0) | |
1056 | return -errno; | |
1057 | ||
1058 | if (no < 0) | |
1059 | return -EIO; | |
1060 | ||
1061 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1062 | return -ENOMEM; | |
1063 | ||
1064 | return 0; | |
1065 | } | |
66cb2fde LP |
1066 | |
1067 | int openpt_in_namespace(pid_t pid, int flags) { | |
1068 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1069 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
66cb2fde LP |
1070 | pid_t child; |
1071 | int r; | |
1072 | ||
1073 | assert(pid > 0); | |
1074 | ||
1075 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1076 | if (r < 0) | |
1077 | return r; | |
1078 | ||
1079 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1080 | return -errno; | |
1081 | ||
1edcb6a9 LP |
1082 | r = namespace_fork("(sd-openptns)", "(sd-openpt)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG, |
1083 | pidnsfd, mntnsfd, -1, usernsfd, rootfd, &child); | |
4c253ed1 LP |
1084 | if (r < 0) |
1085 | return r; | |
1086 | if (r == 0) { | |
66cb2fde LP |
1087 | int master; |
1088 | ||
1089 | pair[0] = safe_close(pair[0]); | |
1090 | ||
66cb2fde LP |
1091 | master = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); |
1092 | if (master < 0) | |
1093 | _exit(EXIT_FAILURE); | |
1094 | ||
1095 | if (unlockpt(master) < 0) | |
1096 | _exit(EXIT_FAILURE); | |
1097 | ||
1098 | if (send_one_fd(pair[1], master, 0) < 0) | |
1099 | _exit(EXIT_FAILURE); | |
1100 | ||
1101 | _exit(EXIT_SUCCESS); | |
1102 | } | |
1103 | ||
1104 | pair[1] = safe_close(pair[1]); | |
1105 | ||
1edcb6a9 | 1106 | r = wait_for_terminate_and_check("(sd-openptns)", child, 0); |
66cb2fde LP |
1107 | if (r < 0) |
1108 | return r; | |
2e87a1fd | 1109 | if (r != EXIT_SUCCESS) |
66cb2fde LP |
1110 | return -EIO; |
1111 | ||
1112 | return receive_one_fd(pair[0], 0); | |
1113 | } | |
40e1f4ea LP |
1114 | |
1115 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
1116 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1117 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
40e1f4ea LP |
1118 | pid_t child; |
1119 | int r; | |
1120 | ||
1121 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1122 | if (r < 0) | |
1123 | return r; | |
1124 | ||
1125 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1126 | return -errno; | |
1127 | ||
1edcb6a9 LP |
1128 | r = namespace_fork("(sd-terminalns)", "(sd-terminal)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG, |
1129 | pidnsfd, mntnsfd, -1, usernsfd, rootfd, &child); | |
4c253ed1 LP |
1130 | if (r < 0) |
1131 | return r; | |
1132 | if (r == 0) { | |
40e1f4ea LP |
1133 | int master; |
1134 | ||
1135 | pair[0] = safe_close(pair[0]); | |
1136 | ||
40e1f4ea LP |
1137 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); |
1138 | if (master < 0) | |
1139 | _exit(EXIT_FAILURE); | |
1140 | ||
1141 | if (send_one_fd(pair[1], master, 0) < 0) | |
1142 | _exit(EXIT_FAILURE); | |
1143 | ||
1144 | _exit(EXIT_SUCCESS); | |
1145 | } | |
1146 | ||
1147 | pair[1] = safe_close(pair[1]); | |
1148 | ||
1edcb6a9 | 1149 | r = wait_for_terminate_and_check("(sd-terminalns)", child, 0); |
40e1f4ea LP |
1150 | if (r < 0) |
1151 | return r; | |
2e87a1fd | 1152 | if (r != EXIT_SUCCESS) |
40e1f4ea LP |
1153 | return -EIO; |
1154 | ||
1155 | return receive_one_fd(pair[0], 0); | |
1156 | } | |
40c9fe4c | 1157 | |
158fbf76 | 1158 | static bool getenv_terminal_is_dumb(void) { |
ac96418b LP |
1159 | const char *e; |
1160 | ||
ac96418b LP |
1161 | e = getenv("TERM"); |
1162 | if (!e) | |
1163 | return true; | |
1164 | ||
1165 | return streq(e, "dumb"); | |
1166 | } | |
1167 | ||
158fbf76 ZJS |
1168 | bool terminal_is_dumb(void) { |
1169 | if (!on_tty()) | |
1170 | return true; | |
1171 | ||
1172 | return getenv_terminal_is_dumb(); | |
1173 | } | |
1174 | ||
40c9fe4c | 1175 | bool colors_enabled(void) { |
40c9fe4c | 1176 | |
0295642d | 1177 | /* Returns true if colors are considered supported on our stdout. For that we check $SYSTEMD_COLORS first |
f95dbcc2 | 1178 | * (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 |
1179 | * 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 |
1180 | * we are PID 1 then we do not check whether we are connected to a TTY, because we don't keep /dev/console open | |
1181 | * continously due to fear of SAK, and hence things are a bit weird. */ | |
1182 | ||
c6063244 | 1183 | if (cached_colors_enabled < 0) { |
acf553b0 | 1184 | int val; |
ae5b3958 | 1185 | |
acf553b0 ZJS |
1186 | val = getenv_bool("SYSTEMD_COLORS"); |
1187 | if (val >= 0) | |
c6063244 | 1188 | cached_colors_enabled = val; |
df0ff127 | 1189 | else if (getpid_cached() == 1) |
158fbf76 | 1190 | /* PID1 outputs to the console without holding it open all the time */ |
c6063244 | 1191 | cached_colors_enabled = !getenv_terminal_is_dumb(); |
ae5b3958 | 1192 | else |
c6063244 | 1193 | cached_colors_enabled = !terminal_is_dumb(); |
40c9fe4c JS |
1194 | } |
1195 | ||
c6063244 | 1196 | return cached_colors_enabled; |
40c9fe4c | 1197 | } |
c83f349c | 1198 | |
c2b32159 LP |
1199 | bool dev_console_colors_enabled(void) { |
1200 | _cleanup_free_ char *s = NULL; | |
1201 | int b; | |
1202 | ||
1203 | /* Returns true if we assume that color is supported on /dev/console. | |
1204 | * | |
1205 | * For that we first check if we explicitly got told to use colors or not, by checking $SYSTEMD_COLORS. If that | |
f95dbcc2 ZJS |
1206 | * isn't set we check whether PID 1 has $TERM set, and if not, whether TERM is set on the kernel command |
1207 | * line. If we find $TERM set we assume color if it's not set to "dumb", similarly to how regular | |
c2b32159 LP |
1208 | * colors_enabled() operates. */ |
1209 | ||
1210 | b = getenv_bool("SYSTEMD_COLORS"); | |
1211 | if (b >= 0) | |
1212 | return b; | |
1213 | ||
1214 | if (getenv_for_pid(1, "TERM", &s) <= 0) | |
1215 | (void) proc_cmdline_get_key("TERM", 0, &s); | |
1216 | ||
1217 | return !streq_ptr(s, "dumb"); | |
1218 | } | |
1219 | ||
526664f6 | 1220 | bool underline_enabled(void) { |
526664f6 | 1221 | |
c6063244 | 1222 | if (cached_underline_enabled < 0) { |
526664f6 LP |
1223 | |
1224 | /* The Linux console doesn't support underlining, turn it off, but only there. */ | |
1225 | ||
c6063244 LP |
1226 | if (colors_enabled()) |
1227 | cached_underline_enabled = !streq_ptr(getenv("TERM"), "linux"); | |
526664f6 | 1228 | else |
c6063244 | 1229 | cached_underline_enabled = false; |
526664f6 LP |
1230 | } |
1231 | ||
c6063244 | 1232 | return cached_underline_enabled; |
526664f6 LP |
1233 | } |
1234 | ||
c83f349c LP |
1235 | int vt_default_utf8(void) { |
1236 | _cleanup_free_ char *b = NULL; | |
1237 | int r; | |
1238 | ||
1239 | /* Read the default VT UTF8 setting from the kernel */ | |
1240 | ||
1241 | r = read_one_line_file("/sys/module/vt/parameters/default_utf8", &b); | |
1242 | if (r < 0) | |
1243 | return r; | |
1244 | ||
1245 | return parse_boolean(b); | |
1246 | } | |
1247 | ||
1248 | int vt_reset_keyboard(int fd) { | |
1249 | int kb; | |
1250 | ||
1251 | /* If we can't read the default, then default to unicode. It's 2017 after all. */ | |
1252 | kb = vt_default_utf8() != 0 ? K_UNICODE : K_XLATE; | |
1253 | ||
1254 | if (ioctl(fd, KDSKBMODE, kb) < 0) | |
1255 | return -errno; | |
1256 | ||
1257 | return 0; | |
1258 | } | |
6179ede1 FB |
1259 | |
1260 | int vt_restore(int fd) { | |
1261 | static const struct vt_mode mode = { | |
1262 | .mode = VT_AUTO, | |
1263 | }; | |
1264 | int r, q = 0; | |
1265 | ||
1266 | r = ioctl(fd, KDSETMODE, KD_TEXT); | |
1267 | if (r < 0) | |
1268 | q = log_debug_errno(errno, "Failed to set VT in text mode, ignoring: %m"); | |
1269 | ||
1270 | r = vt_reset_keyboard(fd); | |
1271 | if (r < 0) { | |
1272 | log_debug_errno(r, "Failed to reset keyboard mode, ignoring: %m"); | |
1273 | if (q >= 0) | |
1274 | q = r; | |
1275 | } | |
1276 | ||
1277 | r = ioctl(fd, VT_SETMODE, &mode); | |
1278 | if (r < 0) { | |
1279 | log_debug_errno(errno, "Failed to set VT_AUTO mode, ignoring: %m"); | |
1280 | if (q >= 0) | |
1281 | q = -errno; | |
1282 | } | |
1283 | ||
1284 | r = fchown(fd, 0, (gid_t) -1); | |
1285 | if (r < 0) { | |
1286 | log_debug_errno(errno, "Failed to chown VT, ignoring: %m"); | |
1287 | if (q >= 0) | |
1288 | q = -errno; | |
1289 | } | |
1290 | ||
1291 | return q; | |
1292 | } | |
27dafac9 FB |
1293 | |
1294 | int vt_release(int fd, bool restore) { | |
1295 | assert(fd >= 0); | |
1296 | ||
1297 | /* This function releases the VT by acknowledging the VT-switch signal | |
1298 | * sent by the kernel and optionally reset the VT in text and auto | |
1299 | * VT-switching modes. */ | |
1300 | ||
1301 | if (ioctl(fd, VT_RELDISP, 1) < 0) | |
1302 | return -errno; | |
1303 | ||
1304 | if (restore) | |
1305 | return vt_restore(fd); | |
1306 | ||
1307 | return 0; | |
1308 | } |