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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> | |
11c3a366 | 14 | #include <sys/inotify.h> |
23b27b39 | 15 | #include <sys/ioctl.h> |
11c3a366 TA |
16 | #include <sys/sysmacros.h> |
17 | #include <sys/time.h> | |
07630cea | 18 | #include <sys/types.h> |
23b27b39 | 19 | #include <sys/utsname.h> |
288a74cc | 20 | #include <termios.h> |
07630cea | 21 | #include <unistd.h> |
288a74cc | 22 | |
b5efdb8a | 23 | #include "alloc-util.h" |
81f5e513 | 24 | #include "copy.h" |
f8360f33 | 25 | #include "def.h" |
acf553b0 | 26 | #include "env-util.h" |
3ffd4af2 | 27 | #include "fd-util.h" |
288a74cc | 28 | #include "fileio.h" |
f4f15635 | 29 | #include "fs-util.h" |
c004493c | 30 | #include "io-util.h" |
93cc7779 TA |
31 | #include "log.h" |
32 | #include "macro.h" | |
0cb8e3d1 | 33 | #include "namespace-util.h" |
6bedfcbb | 34 | #include "parse-util.h" |
c2b32159 LP |
35 | #include "path-util.h" |
36 | #include "proc-cmdline.h" | |
07630cea | 37 | #include "process-util.h" |
2583fbea | 38 | #include "socket-util.h" |
8fcde012 | 39 | #include "stat-util.h" |
07630cea | 40 | #include "string-util.h" |
6af62124 | 41 | #include "strv.h" |
3ffd4af2 | 42 | #include "terminal-util.h" |
07630cea LP |
43 | #include "time-util.h" |
44 | #include "util.h" | |
288a74cc RC |
45 | |
46 | static volatile unsigned cached_columns = 0; | |
47 | static volatile unsigned cached_lines = 0; | |
48 | ||
c6063244 LP |
49 | static volatile int cached_on_tty = -1; |
50 | static volatile int cached_colors_enabled = -1; | |
51 | static volatile int cached_underline_enabled = -1; | |
52 | ||
288a74cc RC |
53 | int chvt(int vt) { |
54 | _cleanup_close_ int fd; | |
55 | ||
0295642d LP |
56 | /* Switch to the specified vt number. If the VT is specified <= 0 switch to the VT the kernel log messages go, |
57 | * if that's configured. */ | |
58 | ||
0a8b555c | 59 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
60 | if (fd < 0) |
61 | return -errno; | |
62 | ||
b9e74c39 | 63 | if (vt <= 0) { |
288a74cc RC |
64 | int tiocl[2] = { |
65 | TIOCL_GETKMSGREDIRECT, | |
66 | 0 | |
67 | }; | |
68 | ||
69 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
70 | return -errno; | |
71 | ||
72 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
73 | } | |
74 | ||
75 | if (ioctl(fd, VT_ACTIVATE, vt) < 0) | |
76 | return -errno; | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { | |
715bcf36 LP |
82 | _cleanup_free_ char *line = NULL; |
83 | struct termios old_termios; | |
14f594b9 | 84 | int r, fd; |
288a74cc RC |
85 | |
86 | assert(f); | |
87 | assert(ret); | |
88 | ||
14f594b9 LP |
89 | /* If this is a terminal, then switch canonical mode off, so that we can read a single |
90 | * character. (Note that fmemopen() streams do not have an fd associated with them, let's handle that | |
91 | * nicely.) */ | |
92 | fd = fileno(f); | |
93 | if (fd >= 0 && tcgetattr(fd, &old_termios) >= 0) { | |
715bcf36 | 94 | struct termios new_termios = old_termios; |
288a74cc RC |
95 | |
96 | new_termios.c_lflag &= ~ICANON; | |
97 | new_termios.c_cc[VMIN] = 1; | |
98 | new_termios.c_cc[VTIME] = 0; | |
99 | ||
14f594b9 | 100 | if (tcsetattr(fd, TCSADRAIN, &new_termios) >= 0) { |
03a7dbea | 101 | char c; |
288a74cc RC |
102 | |
103 | if (t != USEC_INFINITY) { | |
14f594b9 LP |
104 | if (fd_wait_for_event(fd, POLLIN, t) <= 0) { |
105 | (void) tcsetattr(fd, TCSADRAIN, &old_termios); | |
288a74cc RC |
106 | return -ETIMEDOUT; |
107 | } | |
108 | } | |
109 | ||
03a7dbea | 110 | r = safe_fgetc(f, &c); |
14f594b9 | 111 | (void) tcsetattr(fd, TCSADRAIN, &old_termios); |
d3f9790c LP |
112 | if (r < 0) |
113 | return r; | |
03a7dbea LP |
114 | if (r == 0) |
115 | return -EIO; | |
288a74cc RC |
116 | |
117 | if (need_nl) | |
118 | *need_nl = c != '\n'; | |
119 | ||
120 | *ret = c; | |
121 | return 0; | |
122 | } | |
123 | } | |
124 | ||
14f594b9 LP |
125 | if (t != USEC_INFINITY && fd > 0) { |
126 | /* Let's wait the specified amount of time for input. When we have no fd we skip this, under | |
127 | * the assumption that this is an fmemopen() stream or so where waiting doesn't make sense | |
128 | * anyway, as the data is either already in the stream or cannot possible be placed there | |
129 | * while we access the stream */ | |
130 | ||
131 | if (fd_wait_for_event(fd, POLLIN, t) <= 0) | |
288a74cc RC |
132 | return -ETIMEDOUT; |
133 | } | |
134 | ||
715bcf36 | 135 | /* If this is not a terminal, then read a full line instead */ |
288a74cc | 136 | |
715bcf36 LP |
137 | r = read_line(f, 16, &line); /* longer than necessary, to eat up UTF-8 chars/vt100 key sequences */ |
138 | if (r < 0) | |
139 | return r; | |
140 | if (r == 0) | |
141 | return -EIO; | |
288a74cc RC |
142 | |
143 | if (strlen(line) != 1) | |
144 | return -EBADMSG; | |
145 | ||
146 | if (need_nl) | |
147 | *need_nl = false; | |
148 | ||
149 | *ret = line[0]; | |
150 | return 0; | |
151 | } | |
152 | ||
3c670f89 FB |
153 | #define DEFAULT_ASK_REFRESH_USEC (2*USEC_PER_SEC) |
154 | ||
155 | int ask_char(char *ret, const char *replies, const char *fmt, ...) { | |
288a74cc RC |
156 | int r; |
157 | ||
158 | assert(ret); | |
159 | assert(replies); | |
3c670f89 | 160 | assert(fmt); |
288a74cc RC |
161 | |
162 | for (;;) { | |
163 | va_list ap; | |
164 | char c; | |
165 | bool need_nl = true; | |
166 | ||
7565bb98 | 167 | if (colors_enabled()) |
1fc464f6 | 168 | fputs(ANSI_HIGHLIGHT, stdout); |
288a74cc | 169 | |
3c670f89 FB |
170 | putchar('\r'); |
171 | ||
172 | va_start(ap, fmt); | |
173 | vprintf(fmt, ap); | |
288a74cc RC |
174 | va_end(ap); |
175 | ||
7565bb98 | 176 | if (colors_enabled()) |
1fc464f6 | 177 | fputs(ANSI_NORMAL, stdout); |
288a74cc RC |
178 | |
179 | fflush(stdout); | |
180 | ||
3c670f89 | 181 | r = read_one_char(stdin, &c, DEFAULT_ASK_REFRESH_USEC, &need_nl); |
288a74cc RC |
182 | if (r < 0) { |
183 | ||
3c670f89 FB |
184 | if (r == -ETIMEDOUT) |
185 | continue; | |
186 | ||
288a74cc RC |
187 | if (r == -EBADMSG) { |
188 | puts("Bad input, please try again."); | |
189 | continue; | |
190 | } | |
191 | ||
192 | putchar('\n'); | |
193 | return r; | |
194 | } | |
195 | ||
196 | if (need_nl) | |
197 | putchar('\n'); | |
198 | ||
199 | if (strchr(replies, c)) { | |
200 | *ret = c; | |
201 | return 0; | |
202 | } | |
203 | ||
204 | puts("Read unexpected character, please try again."); | |
205 | } | |
206 | } | |
207 | ||
208 | int ask_string(char **ret, const char *text, ...) { | |
03d94294 ZJS |
209 | _cleanup_free_ char *line = NULL; |
210 | va_list ap; | |
715bcf36 LP |
211 | int r; |
212 | ||
288a74cc RC |
213 | assert(ret); |
214 | assert(text); | |
215 | ||
03d94294 ZJS |
216 | if (colors_enabled()) |
217 | fputs(ANSI_HIGHLIGHT, stdout); | |
288a74cc | 218 | |
03d94294 ZJS |
219 | va_start(ap, text); |
220 | vprintf(text, ap); | |
221 | va_end(ap); | |
288a74cc | 222 | |
03d94294 ZJS |
223 | if (colors_enabled()) |
224 | fputs(ANSI_NORMAL, stdout); | |
288a74cc | 225 | |
03d94294 | 226 | fflush(stdout); |
288a74cc | 227 | |
03d94294 ZJS |
228 | r = read_line(stdin, LONG_LINE_MAX, &line); |
229 | if (r < 0) | |
230 | return r; | |
231 | if (r == 0) | |
232 | return -EIO; | |
288a74cc | 233 | |
03d94294 ZJS |
234 | *ret = TAKE_PTR(line); |
235 | return 0; | |
288a74cc RC |
236 | } |
237 | ||
238 | int reset_terminal_fd(int fd, bool switch_to_text) { | |
239 | struct termios termios; | |
240 | int r = 0; | |
241 | ||
242 | /* Set terminal to some sane defaults */ | |
243 | ||
244 | assert(fd >= 0); | |
245 | ||
246 | /* We leave locked terminal attributes untouched, so that | |
247 | * Plymouth may set whatever it wants to set, and we don't | |
248 | * interfere with that. */ | |
249 | ||
250 | /* Disable exclusive mode, just in case */ | |
7d927c9a | 251 | (void) ioctl(fd, TIOCNXCL); |
288a74cc RC |
252 | |
253 | /* Switch to text mode */ | |
254 | if (switch_to_text) | |
7d927c9a | 255 | (void) ioctl(fd, KDSETMODE, KD_TEXT); |
288a74cc | 256 | |
73e669e0 | 257 | /* Set default keyboard mode */ |
c83f349c | 258 | (void) vt_reset_keyboard(fd); |
288a74cc RC |
259 | |
260 | if (tcgetattr(fd, &termios) < 0) { | |
261 | r = -errno; | |
262 | goto finish; | |
263 | } | |
264 | ||
265 | /* We only reset the stuff that matters to the software. How | |
266 | * hardware is set up we don't touch assuming that somebody | |
267 | * else will do that for us */ | |
268 | ||
269 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
270 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
271 | termios.c_oflag |= ONLCR; | |
272 | termios.c_cflag |= CREAD; | |
273 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
274 | ||
275 | termios.c_cc[VINTR] = 03; /* ^C */ | |
276 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
277 | termios.c_cc[VERASE] = 0177; | |
278 | termios.c_cc[VKILL] = 025; /* ^X */ | |
279 | termios.c_cc[VEOF] = 04; /* ^D */ | |
280 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
281 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
282 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
283 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
284 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
285 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
286 | termios.c_cc[VEOL] = 0; | |
287 | termios.c_cc[VEOL2] = 0; | |
288 | ||
289 | termios.c_cc[VTIME] = 0; | |
290 | termios.c_cc[VMIN] = 1; | |
291 | ||
292 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
293 | r = -errno; | |
294 | ||
295 | finish: | |
296 | /* Just in case, flush all crap out */ | |
7d927c9a | 297 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
298 | |
299 | return r; | |
300 | } | |
301 | ||
302 | int reset_terminal(const char *name) { | |
303 | _cleanup_close_ int fd = -1; | |
304 | ||
0a8b555c LP |
305 | /* We open the terminal with O_NONBLOCK here, to ensure we |
306 | * don't block on carrier if this is a terminal with carrier | |
307 | * configured. */ | |
308 | ||
309 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
310 | if (fd < 0) |
311 | return fd; | |
312 | ||
313 | return reset_terminal_fd(fd, true); | |
314 | } | |
315 | ||
316 | int open_terminal(const char *name, int mode) { | |
288a74cc | 317 | unsigned c = 0; |
87964ec7 | 318 | int fd; |
288a74cc RC |
319 | |
320 | /* | |
321 | * If a TTY is in the process of being closed opening it might | |
322 | * cause EIO. This is horribly awful, but unlikely to be | |
323 | * changed in the kernel. Hence we work around this problem by | |
324 | * retrying a couple of times. | |
325 | * | |
326 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
327 | */ | |
328 | ||
35bdab77 LP |
329 | if (mode & O_CREAT) |
330 | return -EINVAL; | |
288a74cc RC |
331 | |
332 | for (;;) { | |
333 | fd = open(name, mode, 0); | |
334 | if (fd >= 0) | |
335 | break; | |
336 | ||
337 | if (errno != EIO) | |
338 | return -errno; | |
339 | ||
340 | /* Max 1s in total */ | |
341 | if (c >= 20) | |
342 | return -errno; | |
343 | ||
344 | usleep(50 * USEC_PER_MSEC); | |
345 | c++; | |
346 | } | |
347 | ||
87964ec7 | 348 | if (isatty(fd) <= 0) { |
288a74cc RC |
349 | safe_close(fd); |
350 | return -ENOTTY; | |
351 | } | |
352 | ||
353 | return fd; | |
354 | } | |
355 | ||
356 | int acquire_terminal( | |
357 | const char *name, | |
8854d795 | 358 | AcquireTerminalFlags flags, |
288a74cc RC |
359 | usec_t timeout) { |
360 | ||
8854d795 LP |
361 | _cleanup_close_ int notify = -1, fd = -1; |
362 | usec_t ts = USEC_INFINITY; | |
363 | int r, wd = -1; | |
288a74cc RC |
364 | |
365 | assert(name); | |
8854d795 | 366 | assert(IN_SET(flags & ~ACQUIRE_TERMINAL_PERMISSIVE, ACQUIRE_TERMINAL_TRY, ACQUIRE_TERMINAL_FORCE, ACQUIRE_TERMINAL_WAIT)); |
288a74cc | 367 | |
8854d795 LP |
368 | /* We use inotify to be notified when the tty is closed. We create the watch before checking if we can actually |
369 | * acquire it, so that we don't lose any event. | |
288a74cc | 370 | * |
8854d795 LP |
371 | * Note: strictly speaking this actually watches for the device being closed, it does *not* really watch |
372 | * whether a tty loses its controlling process. However, unless some rogue process uses TIOCNOTTY on /dev/tty | |
f95dbcc2 ZJS |
373 | * *after* closing its tty otherwise this will not become a problem. As long as the administrator makes sure to |
374 | * not configure any service on the same tty as an untrusted user this should not be a problem. (Which they | |
8854d795 LP |
375 | * probably should not do anyway.) */ |
376 | ||
377 | if ((flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_WAIT) { | |
288a74cc | 378 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); |
8854d795 LP |
379 | if (notify < 0) |
380 | return -errno; | |
288a74cc RC |
381 | |
382 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
8854d795 LP |
383 | if (wd < 0) |
384 | return -errno; | |
385 | ||
386 | if (timeout != USEC_INFINITY) | |
387 | ts = now(CLOCK_MONOTONIC); | |
288a74cc RC |
388 | } |
389 | ||
390 | for (;;) { | |
391 | struct sigaction sa_old, sa_new = { | |
392 | .sa_handler = SIG_IGN, | |
393 | .sa_flags = SA_RESTART, | |
394 | }; | |
395 | ||
396 | if (notify >= 0) { | |
397 | r = flush_fd(notify); | |
398 | if (r < 0) | |
8854d795 | 399 | return r; |
288a74cc RC |
400 | } |
401 | ||
8854d795 LP |
402 | /* We pass here O_NOCTTY only so that we can check the return value TIOCSCTTY and have a reliable way |
403 | * to figure out if we successfully became the controlling process of the tty */ | |
288a74cc RC |
404 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); |
405 | if (fd < 0) | |
406 | return fd; | |
407 | ||
8854d795 | 408 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed if we already own the tty. */ |
288a74cc RC |
409 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); |
410 | ||
411 | /* First, try to get the tty */ | |
8854d795 LP |
412 | r = ioctl(fd, TIOCSCTTY, |
413 | (flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_FORCE) < 0 ? -errno : 0; | |
288a74cc | 414 | |
8854d795 | 415 | /* Reset signal handler to old value */ |
288a74cc RC |
416 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); |
417 | ||
8854d795 LP |
418 | /* Success? Exit the loop now! */ |
419 | if (r >= 0) | |
420 | break; | |
288a74cc | 421 | |
8854d795 LP |
422 | /* Any failure besides -EPERM? Fail, regardless of the mode. */ |
423 | if (r != -EPERM) | |
424 | return r; | |
288a74cc | 425 | |
8854d795 LP |
426 | if (flags & ACQUIRE_TERMINAL_PERMISSIVE) /* If we are in permissive mode, then EPERM is fine, turn this |
427 | * into a success. Note that EPERM is also returned if we | |
428 | * already are the owner of the TTY. */ | |
288a74cc RC |
429 | break; |
430 | ||
8854d795 LP |
431 | if (flags != ACQUIRE_TERMINAL_WAIT) /* If we are in TRY or FORCE mode, then propagate EPERM as EPERM */ |
432 | return r; | |
433 | ||
288a74cc | 434 | assert(notify >= 0); |
8854d795 | 435 | assert(wd >= 0); |
288a74cc RC |
436 | |
437 | for (;;) { | |
438 | union inotify_event_buffer buffer; | |
439 | struct inotify_event *e; | |
440 | ssize_t l; | |
441 | ||
442 | if (timeout != USEC_INFINITY) { | |
443 | usec_t n; | |
444 | ||
8854d795 LP |
445 | assert(ts != USEC_INFINITY); |
446 | ||
288a74cc | 447 | n = now(CLOCK_MONOTONIC); |
8854d795 LP |
448 | if (ts + timeout < n) |
449 | return -ETIMEDOUT; | |
288a74cc | 450 | |
f80da6f3 | 451 | r = fd_wait_for_event(notify, POLLIN, ts + timeout - n); |
288a74cc | 452 | if (r < 0) |
8854d795 LP |
453 | return r; |
454 | if (r == 0) | |
455 | return -ETIMEDOUT; | |
288a74cc RC |
456 | } |
457 | ||
458 | l = read(notify, &buffer, sizeof(buffer)); | |
459 | if (l < 0) { | |
3742095b | 460 | if (IN_SET(errno, EINTR, EAGAIN)) |
288a74cc RC |
461 | continue; |
462 | ||
8854d795 | 463 | return -errno; |
288a74cc RC |
464 | } |
465 | ||
466 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
8854d795 LP |
467 | if (e->mask & IN_Q_OVERFLOW) /* If we hit an inotify queue overflow, simply check if the terminal is up for grabs now. */ |
468 | break; | |
469 | ||
470 | if (e->wd != wd || !(e->mask & IN_CLOSE)) /* Safety checks */ | |
471 | return -EIO; | |
288a74cc RC |
472 | } |
473 | ||
474 | break; | |
475 | } | |
476 | ||
8854d795 LP |
477 | /* We close the tty fd here since if the old session ended our handle will be dead. It's important that |
478 | * we do this after sleeping, so that we don't enter an endless loop. */ | |
288a74cc RC |
479 | fd = safe_close(fd); |
480 | } | |
481 | ||
c10d6bdb | 482 | return TAKE_FD(fd); |
288a74cc RC |
483 | } |
484 | ||
485 | int release_terminal(void) { | |
486 | static const struct sigaction sa_new = { | |
487 | .sa_handler = SIG_IGN, | |
488 | .sa_flags = SA_RESTART, | |
489 | }; | |
490 | ||
491 | _cleanup_close_ int fd = -1; | |
492 | struct sigaction sa_old; | |
87964ec7 | 493 | int r; |
288a74cc | 494 | |
0a8b555c | 495 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
496 | if (fd < 0) |
497 | return -errno; | |
498 | ||
499 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
500 | * by our own TIOCNOTTY */ | |
501 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
502 | ||
87964ec7 | 503 | r = ioctl(fd, TIOCNOTTY) < 0 ? -errno : 0; |
288a74cc RC |
504 | |
505 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
506 | ||
507 | return r; | |
508 | } | |
509 | ||
510 | int terminal_vhangup_fd(int fd) { | |
511 | assert(fd >= 0); | |
512 | ||
513 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
514 | return -errno; | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
519 | int terminal_vhangup(const char *name) { | |
520 | _cleanup_close_ int fd; | |
521 | ||
0a8b555c | 522 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
523 | if (fd < 0) |
524 | return fd; | |
525 | ||
526 | return terminal_vhangup_fd(fd); | |
527 | } | |
528 | ||
529 | int vt_disallocate(const char *name) { | |
ba5d26cc | 530 | const char *e; |
1ba23931 | 531 | int r; |
288a74cc RC |
532 | |
533 | /* Deallocate the VT if possible. If not possible | |
534 | * (i.e. because it is the active one), at least clear it | |
ba5d26cc | 535 | * entirely (including the scrollback buffer). */ |
288a74cc | 536 | |
27458ed6 LP |
537 | e = path_startswith(name, "/dev/"); |
538 | if (!e) | |
288a74cc RC |
539 | return -EINVAL; |
540 | ||
ba5d26cc ZJS |
541 | if (tty_is_vc(name)) { |
542 | _cleanup_close_ int fd = -1; | |
543 | unsigned u; | |
544 | const char *n; | |
288a74cc | 545 | |
ba5d26cc ZJS |
546 | n = startswith(e, "tty"); |
547 | if (!n) | |
548 | return -EINVAL; | |
288a74cc | 549 | |
ba5d26cc ZJS |
550 | r = safe_atou(n, &u); |
551 | if (r < 0) | |
552 | return r; | |
288a74cc | 553 | |
ba5d26cc ZJS |
554 | if (u <= 0) |
555 | return -EINVAL; | |
288a74cc | 556 | |
ba5d26cc ZJS |
557 | /* Try to deallocate */ |
558 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
559 | if (fd < 0) | |
560 | return fd; | |
288a74cc | 561 | |
ba5d26cc ZJS |
562 | r = ioctl(fd, VT_DISALLOCATE, u); |
563 | if (r >= 0) | |
564 | return 0; | |
565 | if (errno != EBUSY) | |
566 | return -errno; | |
567 | } | |
288a74cc | 568 | |
ba5d26cc ZJS |
569 | /* So this is not a VT (in which case we cannot deallocate it), |
570 | * or we failed to deallocate. Let's at least clear the screen. */ | |
288a74cc | 571 | |
ba5d26cc ZJS |
572 | _cleanup_close_ int fd2 = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); |
573 | if (fd2 < 0) | |
574 | return fd2; | |
288a74cc | 575 | |
ba5d26cc ZJS |
576 | (void) loop_write(fd2, |
577 | "\033[r" /* clear scrolling region */ | |
578 | "\033[H" /* move home */ | |
579 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
580 | 10, false); | |
288a74cc RC |
581 | return 0; |
582 | } | |
583 | ||
288a74cc RC |
584 | int make_console_stdio(void) { |
585 | int fd, r; | |
586 | ||
9281e703 LP |
587 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr, if we can. If we can't use |
588 | * /dev/null instead. This is particularly useful if /dev/console is turned off, e.g. if console=null | |
589 | * is specified on the kernel command line. */ | |
288a74cc | 590 | |
8854d795 | 591 | fd = acquire_terminal("/dev/console", ACQUIRE_TERMINAL_FORCE|ACQUIRE_TERMINAL_PERMISSIVE, USEC_INFINITY); |
9281e703 LP |
592 | if (fd < 0) { |
593 | log_warning_errno(fd, "Failed to acquire terminal, using /dev/null stdin/stdout/stderr instead: %m"); | |
288a74cc | 594 | |
9281e703 LP |
595 | r = make_null_stdio(); |
596 | if (r < 0) | |
597 | return log_error_errno(r, "Failed to make /dev/null stdin/stdout/stderr: %m"); | |
3d18b167 | 598 | |
9281e703 LP |
599 | } else { |
600 | r = reset_terminal_fd(fd, true); | |
601 | if (r < 0) | |
602 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
288a74cc | 603 | |
9281e703 LP |
604 | r = rearrange_stdio(fd, fd, fd); /* This invalidates 'fd' both on success and on failure. */ |
605 | if (r < 0) | |
606 | return log_error_errno(r, "Failed to make terminal stdin/stdout/stderr: %m"); | |
607 | } | |
c6063244 | 608 | |
9281e703 | 609 | reset_terminal_feature_caches(); |
288a74cc RC |
610 | return 0; |
611 | } | |
612 | ||
288a74cc RC |
613 | bool tty_is_vc(const char *tty) { |
614 | assert(tty); | |
615 | ||
616 | return vtnr_from_tty(tty) >= 0; | |
617 | } | |
618 | ||
619 | bool tty_is_console(const char *tty) { | |
620 | assert(tty); | |
621 | ||
a119ec7c | 622 | return streq(skip_dev_prefix(tty), "console"); |
288a74cc RC |
623 | } |
624 | ||
625 | int vtnr_from_tty(const char *tty) { | |
626 | int i, r; | |
627 | ||
628 | assert(tty); | |
629 | ||
a119ec7c | 630 | tty = skip_dev_prefix(tty); |
288a74cc RC |
631 | |
632 | if (!startswith(tty, "tty") ) | |
633 | return -EINVAL; | |
634 | ||
635 | if (tty[3] < '0' || tty[3] > '9') | |
636 | return -EINVAL; | |
637 | ||
638 | r = safe_atoi(tty+3, &i); | |
639 | if (r < 0) | |
640 | return r; | |
641 | ||
642 | if (i < 0 || i > 63) | |
643 | return -EINVAL; | |
644 | ||
645 | return i; | |
646 | } | |
647 | ||
7b912648 LP |
648 | int resolve_dev_console(char **ret) { |
649 | _cleanup_free_ char *active = NULL; | |
288a74cc | 650 | char *tty; |
7b912648 | 651 | int r; |
288a74cc | 652 | |
7b912648 LP |
653 | assert(ret); |
654 | ||
655 | /* Resolve where /dev/console is pointing to, if /sys is actually ours (i.e. not read-only-mounted which is a | |
656 | * sign for container setups) */ | |
288a74cc RC |
657 | |
658 | if (path_is_read_only_fs("/sys") > 0) | |
7b912648 | 659 | return -ENOMEDIUM; |
288a74cc | 660 | |
7b912648 LP |
661 | r = read_one_line_file("/sys/class/tty/console/active", &active); |
662 | if (r < 0) | |
663 | return r; | |
288a74cc | 664 | |
7b912648 LP |
665 | /* If multiple log outputs are configured the last one is what /dev/console points to */ |
666 | tty = strrchr(active, ' '); | |
288a74cc RC |
667 | if (tty) |
668 | tty++; | |
669 | else | |
7b912648 | 670 | tty = active; |
288a74cc RC |
671 | |
672 | if (streq(tty, "tty0")) { | |
7b912648 | 673 | active = mfree(active); |
288a74cc RC |
674 | |
675 | /* Get the active VC (e.g. tty1) */ | |
7b912648 LP |
676 | r = read_one_line_file("/sys/class/tty/tty0/active", &active); |
677 | if (r < 0) | |
678 | return r; | |
679 | ||
680 | tty = active; | |
681 | } | |
682 | ||
ae2a15bc LP |
683 | if (tty == active) |
684 | *ret = TAKE_PTR(active); | |
685 | else { | |
7b912648 LP |
686 | char *tmp; |
687 | ||
688 | tmp = strdup(tty); | |
689 | if (!tmp) | |
690 | return -ENOMEM; | |
691 | ||
692 | *ret = tmp; | |
288a74cc RC |
693 | } |
694 | ||
7b912648 | 695 | return 0; |
288a74cc RC |
696 | } |
697 | ||
bef41af2 LP |
698 | int get_kernel_consoles(char ***ret) { |
699 | _cleanup_strv_free_ char **l = NULL; | |
6af62124 | 700 | _cleanup_free_ char *line = NULL; |
bef41af2 | 701 | const char *p; |
6af62124 WF |
702 | int r; |
703 | ||
bef41af2 LP |
704 | assert(ret); |
705 | ||
f95dbcc2 | 706 | /* If /sys is mounted read-only this means we are running in some kind of container environment. In that |
bef41af2 LP |
707 | * case /sys would reflect the host system, not us, hence ignore the data we can read from it. */ |
708 | if (path_is_read_only_fs("/sys") > 0) | |
709 | goto fallback; | |
6af62124 WF |
710 | |
711 | r = read_one_line_file("/sys/class/tty/console/active", &line); | |
712 | if (r < 0) | |
713 | return r; | |
714 | ||
bef41af2 | 715 | p = line; |
6af62124 | 716 | for (;;) { |
6abdec98 | 717 | _cleanup_free_ char *tty = NULL, *path = NULL; |
6af62124 | 718 | |
bef41af2 | 719 | r = extract_first_word(&p, &tty, NULL, 0); |
6af62124 WF |
720 | if (r < 0) |
721 | return r; | |
722 | if (r == 0) | |
723 | break; | |
724 | ||
725 | if (streq(tty, "tty0")) { | |
726 | tty = mfree(tty); | |
727 | r = read_one_line_file("/sys/class/tty/tty0/active", &tty); | |
728 | if (r < 0) | |
729 | return r; | |
730 | } | |
731 | ||
6abdec98 | 732 | path = path_join("/dev", tty); |
6af62124 WF |
733 | if (!path) |
734 | return -ENOMEM; | |
735 | ||
736 | if (access(path, F_OK) < 0) { | |
737 | log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path); | |
6af62124 WF |
738 | continue; |
739 | } | |
740 | ||
6abdec98 | 741 | r = strv_consume(&l, TAKE_PTR(path)); |
6af62124 WF |
742 | if (r < 0) |
743 | return r; | |
744 | } | |
745 | ||
bef41af2 | 746 | if (strv_isempty(l)) { |
6af62124 | 747 | log_debug("No devices found for system console"); |
bef41af2 | 748 | goto fallback; |
6af62124 WF |
749 | } |
750 | ||
ae2a15bc | 751 | *ret = TAKE_PTR(l); |
bef41af2 LP |
752 | |
753 | return 0; | |
754 | ||
755 | fallback: | |
756 | r = strv_extend(&l, "/dev/console"); | |
757 | if (r < 0) | |
758 | return r; | |
759 | ||
ae2a15bc | 760 | *ret = TAKE_PTR(l); |
bef41af2 | 761 | |
6af62124 WF |
762 | return 0; |
763 | } | |
764 | ||
288a74cc | 765 | bool tty_is_vc_resolve(const char *tty) { |
7b912648 | 766 | _cleanup_free_ char *resolved = NULL; |
288a74cc RC |
767 | |
768 | assert(tty); | |
769 | ||
a119ec7c | 770 | tty = skip_dev_prefix(tty); |
288a74cc RC |
771 | |
772 | if (streq(tty, "console")) { | |
7b912648 | 773 | if (resolve_dev_console(&resolved) < 0) |
288a74cc | 774 | return false; |
7b912648 LP |
775 | |
776 | tty = resolved; | |
288a74cc RC |
777 | } |
778 | ||
779 | return tty_is_vc(tty); | |
780 | } | |
781 | ||
782 | const char *default_term_for_tty(const char *tty) { | |
6af760f3 | 783 | return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220"; |
288a74cc RC |
784 | } |
785 | ||
786 | int fd_columns(int fd) { | |
787 | struct winsize ws = {}; | |
788 | ||
14f594b9 LP |
789 | if (fd < 0) |
790 | return -EBADF; | |
791 | ||
288a74cc RC |
792 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) |
793 | return -errno; | |
794 | ||
795 | if (ws.ws_col <= 0) | |
796 | return -EIO; | |
797 | ||
798 | return ws.ws_col; | |
799 | } | |
800 | ||
801 | unsigned columns(void) { | |
802 | const char *e; | |
803 | int c; | |
804 | ||
c6063244 | 805 | if (cached_columns > 0) |
288a74cc RC |
806 | return cached_columns; |
807 | ||
808 | c = 0; | |
809 | e = getenv("COLUMNS"); | |
810 | if (e) | |
811 | (void) safe_atoi(e, &c); | |
812 | ||
d09a7135 | 813 | if (c <= 0 || c > USHRT_MAX) { |
288a74cc | 814 | c = fd_columns(STDOUT_FILENO); |
d09a7135 LP |
815 | if (c <= 0) |
816 | c = 80; | |
817 | } | |
288a74cc RC |
818 | |
819 | cached_columns = c; | |
820 | return cached_columns; | |
821 | } | |
822 | ||
823 | int fd_lines(int fd) { | |
824 | struct winsize ws = {}; | |
825 | ||
14f594b9 LP |
826 | if (fd < 0) |
827 | return -EBADF; | |
828 | ||
288a74cc RC |
829 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) |
830 | return -errno; | |
831 | ||
832 | if (ws.ws_row <= 0) | |
833 | return -EIO; | |
834 | ||
835 | return ws.ws_row; | |
836 | } | |
837 | ||
838 | unsigned lines(void) { | |
839 | const char *e; | |
840 | int l; | |
841 | ||
c6063244 | 842 | if (cached_lines > 0) |
288a74cc RC |
843 | return cached_lines; |
844 | ||
845 | l = 0; | |
846 | e = getenv("LINES"); | |
847 | if (e) | |
848 | (void) safe_atoi(e, &l); | |
849 | ||
d09a7135 | 850 | if (l <= 0 || l > USHRT_MAX) { |
288a74cc | 851 | l = fd_lines(STDOUT_FILENO); |
d09a7135 LP |
852 | if (l <= 0) |
853 | l = 24; | |
854 | } | |
288a74cc RC |
855 | |
856 | cached_lines = l; | |
857 | return cached_lines; | |
858 | } | |
859 | ||
860 | /* intended to be used as a SIGWINCH sighandler */ | |
861 | void columns_lines_cache_reset(int signum) { | |
862 | cached_columns = 0; | |
863 | cached_lines = 0; | |
864 | } | |
865 | ||
c6063244 LP |
866 | void reset_terminal_feature_caches(void) { |
867 | cached_columns = 0; | |
868 | cached_lines = 0; | |
869 | ||
870 | cached_colors_enabled = -1; | |
871 | cached_underline_enabled = -1; | |
872 | cached_on_tty = -1; | |
873 | } | |
288a74cc | 874 | |
c6063244 | 875 | bool on_tty(void) { |
8cd0356e LP |
876 | |
877 | /* We check both stdout and stderr, so that situations where pipes on the shell are used are reliably | |
878 | * recognized, regardless if only the output or the errors are piped to some place. Since on_tty() is generally | |
879 | * used to default to a safer, non-interactive, non-color mode of operation it's probably good to be defensive | |
880 | * here, and check for both. Note that we don't check for STDIN_FILENO, because it should fine to use fancy | |
881 | * terminal functionality when outputting stuff, even if the input is piped to us. */ | |
882 | ||
c6063244 | 883 | if (cached_on_tty < 0) |
8cd0356e LP |
884 | cached_on_tty = |
885 | isatty(STDOUT_FILENO) > 0 && | |
886 | isatty(STDERR_FILENO) > 0; | |
288a74cc RC |
887 | |
888 | return cached_on_tty; | |
889 | } | |
890 | ||
288a74cc | 891 | int getttyname_malloc(int fd, char **ret) { |
30222f4b | 892 | char path[PATH_MAX], *c; /* PATH_MAX is counted *with* the trailing NUL byte */ |
288a74cc RC |
893 | int r; |
894 | ||
895 | assert(fd >= 0); | |
896 | assert(ret); | |
897 | ||
30222f4b ZJS |
898 | r = ttyname_r(fd, path, sizeof path); /* positive error */ |
899 | assert(r >= 0); | |
900 | if (r == ERANGE) | |
901 | return -ENAMETOOLONG; | |
902 | if (r > 0) | |
903 | return -r; | |
288a74cc | 904 | |
30222f4b ZJS |
905 | c = strdup(skip_dev_prefix(path)); |
906 | if (!c) | |
907 | return -ENOMEM; | |
288a74cc | 908 | |
30222f4b | 909 | *ret = c; |
288a74cc RC |
910 | return 0; |
911 | } | |
912 | ||
f171decd LP |
913 | int getttyname_harder(int fd, char **ret) { |
914 | _cleanup_free_ char *s = NULL; | |
915 | int r; | |
288a74cc | 916 | |
f171decd LP |
917 | r = getttyname_malloc(fd, &s); |
918 | if (r < 0) | |
919 | return r; | |
288a74cc | 920 | |
f171decd LP |
921 | if (streq(s, "tty")) |
922 | return get_ctty(0, NULL, ret); | |
288a74cc | 923 | |
f171decd | 924 | *ret = TAKE_PTR(s); |
288a74cc RC |
925 | return 0; |
926 | } | |
927 | ||
928 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
929 | int r; | |
930 | _cleanup_free_ char *line = NULL; | |
931 | const char *p; | |
932 | unsigned long ttynr; | |
933 | ||
934 | assert(pid >= 0); | |
935 | ||
936 | p = procfs_file_alloca(pid, "stat"); | |
937 | r = read_one_line_file(p, &line); | |
938 | if (r < 0) | |
939 | return r; | |
940 | ||
941 | p = strrchr(line, ')'); | |
942 | if (!p) | |
943 | return -EIO; | |
944 | ||
945 | p++; | |
946 | ||
947 | if (sscanf(p, " " | |
948 | "%*c " /* state */ | |
949 | "%*d " /* ppid */ | |
950 | "%*d " /* pgrp */ | |
951 | "%*d " /* session */ | |
952 | "%lu ", /* ttynr */ | |
953 | &ttynr) != 1) | |
954 | return -EIO; | |
955 | ||
956 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
cfeaa44a | 957 | return -ENXIO; |
288a74cc RC |
958 | |
959 | if (d) | |
960 | *d = (dev_t) ttynr; | |
961 | ||
962 | return 0; | |
963 | } | |
964 | ||
54b22b26 LP |
965 | int get_ctty(pid_t pid, dev_t *ret_devnr, char **ret) { |
966 | _cleanup_free_ char *fn = NULL, *b = NULL; | |
288a74cc | 967 | dev_t devnr; |
54b22b26 | 968 | int r; |
288a74cc | 969 | |
54b22b26 LP |
970 | r = get_ctty_devnr(pid, &devnr); |
971 | if (r < 0) | |
972 | return r; | |
288a74cc | 973 | |
54b22b26 LP |
974 | r = device_path_make_canonical(S_IFCHR, devnr, &fn); |
975 | if (r < 0) { | |
976 | if (r != -ENOENT) /* No symlink for this in /dev/char/? */ | |
977 | return r; | |
288a74cc | 978 | |
288a74cc | 979 | if (major(devnr) == 136) { |
54b22b26 LP |
980 | /* This is an ugly hack: PTY devices are not listed in /dev/char/, as they don't follow the |
981 | * Linux device model. This means we have no nice way to match them up against their actual | |
982 | * device node. Let's hence do the check by the fixed, assigned major number. Normally we try | |
983 | * to avoid such fixed major/minor matches, but there appears to nother nice way to handle | |
984 | * this. */ | |
985 | ||
288a74cc RC |
986 | if (asprintf(&b, "pts/%u", minor(devnr)) < 0) |
987 | return -ENOMEM; | |
988 | } else { | |
54b22b26 LP |
989 | /* Probably something similar to the ptys which have no symlink in /dev/char/. Let's return |
990 | * something vaguely useful. */ | |
288a74cc | 991 | |
54b22b26 LP |
992 | r = device_path_make_major_minor(S_IFCHR, devnr, &fn); |
993 | if (r < 0) | |
994 | return r; | |
288a74cc | 995 | } |
54b22b26 | 996 | } |
288a74cc | 997 | |
54b22b26 LP |
998 | if (!b) { |
999 | const char *w; | |
1000 | ||
1001 | w = path_startswith(fn, "/dev/"); | |
1002 | if (w) { | |
1003 | b = strdup(w); | |
1004 | if (!b) | |
1005 | return -ENOMEM; | |
1006 | } else | |
1007 | b = TAKE_PTR(fn); | |
288a74cc RC |
1008 | } |
1009 | ||
54b22b26 LP |
1010 | if (ret) |
1011 | *ret = TAKE_PTR(b); | |
1012 | ||
1013 | if (ret_devnr) | |
1014 | *ret_devnr = devnr; | |
288a74cc RC |
1015 | |
1016 | return 0; | |
1017 | } | |
a07c35c3 | 1018 | |
66cb2fde LP |
1019 | int ptsname_malloc(int fd, char **ret) { |
1020 | size_t l = 100; | |
1021 | ||
1022 | assert(fd >= 0); | |
1023 | assert(ret); | |
1024 | ||
1025 | for (;;) { | |
1026 | char *c; | |
1027 | ||
1028 | c = new(char, l); | |
1029 | if (!c) | |
1030 | return -ENOMEM; | |
1031 | ||
1032 | if (ptsname_r(fd, c, l) == 0) { | |
1033 | *ret = c; | |
1034 | return 0; | |
1035 | } | |
1036 | if (errno != ERANGE) { | |
1037 | free(c); | |
1038 | return -errno; | |
1039 | } | |
1040 | ||
1041 | free(c); | |
1fd4c4ed LP |
1042 | |
1043 | if (l > SIZE_MAX / 2) | |
1044 | return -ENOMEM; | |
1045 | ||
66cb2fde LP |
1046 | l *= 2; |
1047 | } | |
1048 | } | |
1049 | ||
ae1d13db FB |
1050 | int openpt_allocate(int flags, char **ret_slave) { |
1051 | _cleanup_close_ int fd = -1; | |
1052 | _cleanup_free_ char *p = NULL; | |
1053 | int r; | |
1054 | ||
1055 | fd = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); | |
1056 | if (fd < 0) | |
1057 | return -errno; | |
1058 | ||
1059 | if (ret_slave) { | |
1060 | r = ptsname_malloc(fd, &p); | |
1061 | if (r < 0) | |
1062 | return r; | |
1063 | ||
1064 | if (!path_startswith(p, "/dev/pts/")) | |
1065 | return -EINVAL; | |
1066 | } | |
1067 | ||
1068 | if (unlockpt(fd) < 0) | |
1069 | return -errno; | |
1070 | ||
1071 | if (ret_slave) | |
1072 | *ret_slave = TAKE_PTR(p); | |
1073 | ||
1074 | return TAKE_FD(fd); | |
1075 | } | |
1076 | ||
1077 | static int ptsname_namespace(int pty, char **ret) { | |
a07c35c3 LP |
1078 | int no = -1, r; |
1079 | ||
1080 | /* Like ptsname(), but doesn't assume that the path is | |
1081 | * accessible in the local namespace. */ | |
1082 | ||
1083 | r = ioctl(pty, TIOCGPTN, &no); | |
1084 | if (r < 0) | |
1085 | return -errno; | |
1086 | ||
1087 | if (no < 0) | |
1088 | return -EIO; | |
1089 | ||
1090 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1091 | return -ENOMEM; | |
1092 | ||
1093 | return 0; | |
1094 | } | |
66cb2fde | 1095 | |
ae1d13db FB |
1096 | int openpt_allocate_in_namespace(pid_t pid, int flags, char **ret_slave) { |
1097 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1, fd = -1; | |
66cb2fde | 1098 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; |
66cb2fde LP |
1099 | pid_t child; |
1100 | int r; | |
1101 | ||
1102 | assert(pid > 0); | |
1103 | ||
1104 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1105 | if (r < 0) | |
1106 | return r; | |
1107 | ||
1108 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1109 | return -errno; | |
1110 | ||
1edcb6a9 LP |
1111 | r = namespace_fork("(sd-openptns)", "(sd-openpt)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG, |
1112 | pidnsfd, mntnsfd, -1, usernsfd, rootfd, &child); | |
4c253ed1 LP |
1113 | if (r < 0) |
1114 | return r; | |
1115 | if (r == 0) { | |
66cb2fde LP |
1116 | pair[0] = safe_close(pair[0]); |
1117 | ||
ae1d13db FB |
1118 | fd = openpt_allocate(flags, NULL); |
1119 | if (fd < 0) | |
66cb2fde LP |
1120 | _exit(EXIT_FAILURE); |
1121 | ||
ae1d13db | 1122 | if (send_one_fd(pair[1], fd, 0) < 0) |
66cb2fde LP |
1123 | _exit(EXIT_FAILURE); |
1124 | ||
1125 | _exit(EXIT_SUCCESS); | |
1126 | } | |
1127 | ||
1128 | pair[1] = safe_close(pair[1]); | |
1129 | ||
1edcb6a9 | 1130 | r = wait_for_terminate_and_check("(sd-openptns)", child, 0); |
66cb2fde LP |
1131 | if (r < 0) |
1132 | return r; | |
2e87a1fd | 1133 | if (r != EXIT_SUCCESS) |
66cb2fde LP |
1134 | return -EIO; |
1135 | ||
ae1d13db FB |
1136 | fd = receive_one_fd(pair[0], 0); |
1137 | if (fd < 0) | |
1138 | return fd; | |
1139 | ||
1140 | if (ret_slave) { | |
1141 | r = ptsname_namespace(fd, ret_slave); | |
1142 | if (r < 0) | |
1143 | return r; | |
1144 | } | |
1145 | ||
1146 | return TAKE_FD(fd); | |
66cb2fde | 1147 | } |
40e1f4ea LP |
1148 | |
1149 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
1150 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1151 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
40e1f4ea LP |
1152 | pid_t child; |
1153 | int r; | |
1154 | ||
1155 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1156 | if (r < 0) | |
1157 | return r; | |
1158 | ||
1159 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1160 | return -errno; | |
1161 | ||
1edcb6a9 LP |
1162 | r = namespace_fork("(sd-terminalns)", "(sd-terminal)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG, |
1163 | pidnsfd, mntnsfd, -1, usernsfd, rootfd, &child); | |
4c253ed1 LP |
1164 | if (r < 0) |
1165 | return r; | |
1166 | if (r == 0) { | |
40e1f4ea LP |
1167 | int master; |
1168 | ||
1169 | pair[0] = safe_close(pair[0]); | |
1170 | ||
40e1f4ea LP |
1171 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); |
1172 | if (master < 0) | |
1173 | _exit(EXIT_FAILURE); | |
1174 | ||
1175 | if (send_one_fd(pair[1], master, 0) < 0) | |
1176 | _exit(EXIT_FAILURE); | |
1177 | ||
1178 | _exit(EXIT_SUCCESS); | |
1179 | } | |
1180 | ||
1181 | pair[1] = safe_close(pair[1]); | |
1182 | ||
1edcb6a9 | 1183 | r = wait_for_terminate_and_check("(sd-terminalns)", child, 0); |
40e1f4ea LP |
1184 | if (r < 0) |
1185 | return r; | |
2e87a1fd | 1186 | if (r != EXIT_SUCCESS) |
40e1f4ea LP |
1187 | return -EIO; |
1188 | ||
1189 | return receive_one_fd(pair[0], 0); | |
1190 | } | |
40c9fe4c | 1191 | |
158fbf76 | 1192 | static bool getenv_terminal_is_dumb(void) { |
ac96418b LP |
1193 | const char *e; |
1194 | ||
ac96418b LP |
1195 | e = getenv("TERM"); |
1196 | if (!e) | |
1197 | return true; | |
1198 | ||
1199 | return streq(e, "dumb"); | |
1200 | } | |
1201 | ||
158fbf76 ZJS |
1202 | bool terminal_is_dumb(void) { |
1203 | if (!on_tty()) | |
1204 | return true; | |
1205 | ||
1206 | return getenv_terminal_is_dumb(); | |
1207 | } | |
1208 | ||
40c9fe4c | 1209 | bool colors_enabled(void) { |
40c9fe4c | 1210 | |
0295642d | 1211 | /* Returns true if colors are considered supported on our stdout. For that we check $SYSTEMD_COLORS first |
f95dbcc2 | 1212 | * (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 |
1213 | * 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 |
1214 | * we are PID 1 then we do not check whether we are connected to a TTY, because we don't keep /dev/console open | |
5238e957 | 1215 | * continuously due to fear of SAK, and hence things are a bit weird. */ |
0295642d | 1216 | |
c6063244 | 1217 | if (cached_colors_enabled < 0) { |
acf553b0 | 1218 | int val; |
ae5b3958 | 1219 | |
acf553b0 ZJS |
1220 | val = getenv_bool("SYSTEMD_COLORS"); |
1221 | if (val >= 0) | |
c6063244 | 1222 | cached_colors_enabled = val; |
c484315b ZJS |
1223 | |
1224 | else if (getenv("NO_COLOR")) | |
1225 | /* We only check for the presence of the variable; value is ignored. */ | |
1226 | cached_colors_enabled = false; | |
1227 | ||
df0ff127 | 1228 | else if (getpid_cached() == 1) |
158fbf76 | 1229 | /* PID1 outputs to the console without holding it open all the time */ |
c6063244 | 1230 | cached_colors_enabled = !getenv_terminal_is_dumb(); |
ae5b3958 | 1231 | else |
c6063244 | 1232 | cached_colors_enabled = !terminal_is_dumb(); |
40c9fe4c JS |
1233 | } |
1234 | ||
c6063244 | 1235 | return cached_colors_enabled; |
40c9fe4c | 1236 | } |
c83f349c | 1237 | |
c2b32159 LP |
1238 | bool dev_console_colors_enabled(void) { |
1239 | _cleanup_free_ char *s = NULL; | |
1240 | int b; | |
1241 | ||
1242 | /* Returns true if we assume that color is supported on /dev/console. | |
1243 | * | |
1244 | * For that we first check if we explicitly got told to use colors or not, by checking $SYSTEMD_COLORS. If that | |
f95dbcc2 ZJS |
1245 | * isn't set we check whether PID 1 has $TERM set, and if not, whether TERM is set on the kernel command |
1246 | * line. If we find $TERM set we assume color if it's not set to "dumb", similarly to how regular | |
c2b32159 LP |
1247 | * colors_enabled() operates. */ |
1248 | ||
1249 | b = getenv_bool("SYSTEMD_COLORS"); | |
1250 | if (b >= 0) | |
1251 | return b; | |
1252 | ||
c484315b ZJS |
1253 | if (getenv("NO_COLOR")) |
1254 | return false; | |
1255 | ||
c2b32159 LP |
1256 | if (getenv_for_pid(1, "TERM", &s) <= 0) |
1257 | (void) proc_cmdline_get_key("TERM", 0, &s); | |
1258 | ||
1259 | return !streq_ptr(s, "dumb"); | |
1260 | } | |
1261 | ||
526664f6 | 1262 | bool underline_enabled(void) { |
526664f6 | 1263 | |
c6063244 | 1264 | if (cached_underline_enabled < 0) { |
526664f6 LP |
1265 | |
1266 | /* The Linux console doesn't support underlining, turn it off, but only there. */ | |
1267 | ||
c6063244 LP |
1268 | if (colors_enabled()) |
1269 | cached_underline_enabled = !streq_ptr(getenv("TERM"), "linux"); | |
526664f6 | 1270 | else |
c6063244 | 1271 | cached_underline_enabled = false; |
526664f6 LP |
1272 | } |
1273 | ||
c6063244 | 1274 | return cached_underline_enabled; |
526664f6 LP |
1275 | } |
1276 | ||
c83f349c LP |
1277 | int vt_default_utf8(void) { |
1278 | _cleanup_free_ char *b = NULL; | |
1279 | int r; | |
1280 | ||
1281 | /* Read the default VT UTF8 setting from the kernel */ | |
1282 | ||
1283 | r = read_one_line_file("/sys/module/vt/parameters/default_utf8", &b); | |
1284 | if (r < 0) | |
1285 | return r; | |
1286 | ||
1287 | return parse_boolean(b); | |
1288 | } | |
1289 | ||
1290 | int vt_reset_keyboard(int fd) { | |
15bba613 | 1291 | int kb; |
c83f349c LP |
1292 | |
1293 | /* If we can't read the default, then default to unicode. It's 2017 after all. */ | |
1294 | kb = vt_default_utf8() != 0 ? K_UNICODE : K_XLATE; | |
1295 | ||
1296 | if (ioctl(fd, KDSKBMODE, kb) < 0) | |
1297 | return -errno; | |
1298 | ||
1299 | return 0; | |
1300 | } | |
6179ede1 FB |
1301 | |
1302 | int vt_restore(int fd) { | |
1303 | static const struct vt_mode mode = { | |
1304 | .mode = VT_AUTO, | |
1305 | }; | |
1306 | int r, q = 0; | |
1307 | ||
1802d5f2 | 1308 | if (ioctl(fd, KDSETMODE, KD_TEXT) < 0) |
6179ede1 FB |
1309 | q = log_debug_errno(errno, "Failed to set VT in text mode, ignoring: %m"); |
1310 | ||
1311 | r = vt_reset_keyboard(fd); | |
1312 | if (r < 0) { | |
1313 | log_debug_errno(r, "Failed to reset keyboard mode, ignoring: %m"); | |
1314 | if (q >= 0) | |
1315 | q = r; | |
1316 | } | |
1317 | ||
1802d5f2 | 1318 | if (ioctl(fd, VT_SETMODE, &mode) < 0) { |
6179ede1 FB |
1319 | log_debug_errno(errno, "Failed to set VT_AUTO mode, ignoring: %m"); |
1320 | if (q >= 0) | |
1321 | q = -errno; | |
1322 | } | |
1323 | ||
1802d5f2 | 1324 | r = fchmod_and_chown(fd, TTY_MODE, 0, (gid_t) -1); |
6179ede1 | 1325 | if (r < 0) { |
1802d5f2 | 1326 | log_debug_errno(r, "Failed to chmod()/chown() VT, ignoring: %m"); |
6179ede1 | 1327 | if (q >= 0) |
1802d5f2 | 1328 | q = r; |
6179ede1 FB |
1329 | } |
1330 | ||
1331 | return q; | |
1332 | } | |
27dafac9 FB |
1333 | |
1334 | int vt_release(int fd, bool restore) { | |
1335 | assert(fd >= 0); | |
1336 | ||
1337 | /* This function releases the VT by acknowledging the VT-switch signal | |
1338 | * sent by the kernel and optionally reset the VT in text and auto | |
1339 | * VT-switching modes. */ | |
1340 | ||
1341 | if (ioctl(fd, VT_RELDISP, 1) < 0) | |
1342 | return -errno; | |
1343 | ||
1344 | if (restore) | |
1345 | return vt_restore(fd); | |
1346 | ||
1347 | return 0; | |
1348 | } | |
37b8d2f6 ZJS |
1349 | |
1350 | void get_log_colors(int priority, const char **on, const char **off, const char **highlight) { | |
1351 | /* Note that this will initialize output variables only when there's something to output. | |
5e2b0e1c | 1352 | * The caller must pre-initialize to "" or NULL as appropriate. */ |
37b8d2f6 ZJS |
1353 | |
1354 | if (priority <= LOG_ERR) { | |
1355 | if (on) | |
1356 | *on = ANSI_HIGHLIGHT_RED; | |
1357 | if (off) | |
1358 | *off = ANSI_NORMAL; | |
1359 | if (highlight) | |
1360 | *highlight = ANSI_HIGHLIGHT; | |
1361 | ||
0d0464d3 ZJS |
1362 | } else if (priority <= LOG_WARNING) { |
1363 | if (on) | |
1364 | *on = ANSI_HIGHLIGHT_YELLOW; | |
1365 | if (off) | |
1366 | *off = ANSI_NORMAL; | |
1367 | if (highlight) | |
1368 | *highlight = ANSI_HIGHLIGHT; | |
1369 | ||
37b8d2f6 ZJS |
1370 | } else if (priority <= LOG_NOTICE) { |
1371 | if (on) | |
1372 | *on = ANSI_HIGHLIGHT; | |
1373 | if (off) | |
1374 | *off = ANSI_NORMAL; | |
1375 | if (highlight) | |
1376 | *highlight = ANSI_HIGHLIGHT_RED; | |
1377 | ||
1378 | } else if (priority >= LOG_DEBUG) { | |
1379 | if (on) | |
1380 | *on = ANSI_GREY; | |
1381 | if (off) | |
1382 | *off = ANSI_NORMAL; | |
1383 | if (highlight) | |
1384 | *highlight = ANSI_HIGHLIGHT_RED; | |
1385 | } | |
1386 | } |