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