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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
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 | 49 | static volatile int cached_on_tty = -1; |
c4fea19a | 50 | static volatile int cached_color_mode = _COLOR_INVALID; |
c6063244 LP |
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 | ||
25e4608b | 167 | fputs(ansi_highlight(), stdout); |
288a74cc | 168 | |
3c670f89 FB |
169 | putchar('\r'); |
170 | ||
171 | va_start(ap, fmt); | |
172 | vprintf(fmt, ap); | |
288a74cc RC |
173 | va_end(ap); |
174 | ||
25e4608b | 175 | fputs(ansi_normal(), stdout); |
288a74cc RC |
176 | |
177 | fflush(stdout); | |
178 | ||
3c670f89 | 179 | r = read_one_char(stdin, &c, DEFAULT_ASK_REFRESH_USEC, &need_nl); |
288a74cc RC |
180 | if (r < 0) { |
181 | ||
3c670f89 FB |
182 | if (r == -ETIMEDOUT) |
183 | continue; | |
184 | ||
288a74cc RC |
185 | if (r == -EBADMSG) { |
186 | puts("Bad input, please try again."); | |
187 | continue; | |
188 | } | |
189 | ||
190 | putchar('\n'); | |
191 | return r; | |
192 | } | |
193 | ||
194 | if (need_nl) | |
195 | putchar('\n'); | |
196 | ||
197 | if (strchr(replies, c)) { | |
198 | *ret = c; | |
199 | return 0; | |
200 | } | |
201 | ||
202 | puts("Read unexpected character, please try again."); | |
203 | } | |
204 | } | |
205 | ||
206 | int ask_string(char **ret, const char *text, ...) { | |
03d94294 ZJS |
207 | _cleanup_free_ char *line = NULL; |
208 | va_list ap; | |
715bcf36 LP |
209 | int r; |
210 | ||
288a74cc RC |
211 | assert(ret); |
212 | assert(text); | |
213 | ||
25e4608b | 214 | fputs(ansi_highlight(), stdout); |
288a74cc | 215 | |
03d94294 ZJS |
216 | va_start(ap, text); |
217 | vprintf(text, ap); | |
218 | va_end(ap); | |
288a74cc | 219 | |
25e4608b | 220 | fputs(ansi_normal(), stdout); |
288a74cc | 221 | |
03d94294 | 222 | fflush(stdout); |
288a74cc | 223 | |
03d94294 ZJS |
224 | r = read_line(stdin, LONG_LINE_MAX, &line); |
225 | if (r < 0) | |
226 | return r; | |
227 | if (r == 0) | |
228 | return -EIO; | |
288a74cc | 229 | |
03d94294 ZJS |
230 | *ret = TAKE_PTR(line); |
231 | return 0; | |
288a74cc RC |
232 | } |
233 | ||
234 | int reset_terminal_fd(int fd, bool switch_to_text) { | |
235 | struct termios termios; | |
236 | int r = 0; | |
237 | ||
238 | /* Set terminal to some sane defaults */ | |
239 | ||
240 | assert(fd >= 0); | |
241 | ||
242 | /* We leave locked terminal attributes untouched, so that | |
243 | * Plymouth may set whatever it wants to set, and we don't | |
244 | * interfere with that. */ | |
245 | ||
246 | /* Disable exclusive mode, just in case */ | |
7d927c9a | 247 | (void) ioctl(fd, TIOCNXCL); |
288a74cc RC |
248 | |
249 | /* Switch to text mode */ | |
250 | if (switch_to_text) | |
7d927c9a | 251 | (void) ioctl(fd, KDSETMODE, KD_TEXT); |
288a74cc | 252 | |
73e669e0 | 253 | /* Set default keyboard mode */ |
c83f349c | 254 | (void) vt_reset_keyboard(fd); |
288a74cc RC |
255 | |
256 | if (tcgetattr(fd, &termios) < 0) { | |
257 | r = -errno; | |
258 | goto finish; | |
259 | } | |
260 | ||
261 | /* We only reset the stuff that matters to the software. How | |
262 | * hardware is set up we don't touch assuming that somebody | |
263 | * else will do that for us */ | |
264 | ||
265 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
266 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
267 | termios.c_oflag |= ONLCR; | |
268 | termios.c_cflag |= CREAD; | |
269 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
270 | ||
271 | termios.c_cc[VINTR] = 03; /* ^C */ | |
272 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
273 | termios.c_cc[VERASE] = 0177; | |
274 | termios.c_cc[VKILL] = 025; /* ^X */ | |
275 | termios.c_cc[VEOF] = 04; /* ^D */ | |
276 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
277 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
278 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
279 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
280 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
281 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
282 | termios.c_cc[VEOL] = 0; | |
283 | termios.c_cc[VEOL2] = 0; | |
284 | ||
285 | termios.c_cc[VTIME] = 0; | |
286 | termios.c_cc[VMIN] = 1; | |
287 | ||
288 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
289 | r = -errno; | |
290 | ||
291 | finish: | |
292 | /* Just in case, flush all crap out */ | |
7d927c9a | 293 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
294 | |
295 | return r; | |
296 | } | |
297 | ||
298 | int reset_terminal(const char *name) { | |
299 | _cleanup_close_ int fd = -1; | |
300 | ||
0a8b555c LP |
301 | /* We open the terminal with O_NONBLOCK here, to ensure we |
302 | * don't block on carrier if this is a terminal with carrier | |
303 | * configured. */ | |
304 | ||
305 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
306 | if (fd < 0) |
307 | return fd; | |
308 | ||
309 | return reset_terminal_fd(fd, true); | |
310 | } | |
311 | ||
312 | int open_terminal(const char *name, int mode) { | |
288a74cc | 313 | unsigned c = 0; |
87964ec7 | 314 | int fd; |
288a74cc RC |
315 | |
316 | /* | |
317 | * If a TTY is in the process of being closed opening it might | |
318 | * cause EIO. This is horribly awful, but unlikely to be | |
319 | * changed in the kernel. Hence we work around this problem by | |
320 | * retrying a couple of times. | |
321 | * | |
322 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
323 | */ | |
324 | ||
35bdab77 LP |
325 | if (mode & O_CREAT) |
326 | return -EINVAL; | |
288a74cc RC |
327 | |
328 | for (;;) { | |
329 | fd = open(name, mode, 0); | |
330 | if (fd >= 0) | |
331 | break; | |
332 | ||
333 | if (errno != EIO) | |
334 | return -errno; | |
335 | ||
336 | /* Max 1s in total */ | |
337 | if (c >= 20) | |
338 | return -errno; | |
339 | ||
340 | usleep(50 * USEC_PER_MSEC); | |
341 | c++; | |
342 | } | |
343 | ||
87964ec7 | 344 | if (isatty(fd) <= 0) { |
288a74cc RC |
345 | safe_close(fd); |
346 | return -ENOTTY; | |
347 | } | |
348 | ||
349 | return fd; | |
350 | } | |
351 | ||
352 | int acquire_terminal( | |
353 | const char *name, | |
8854d795 | 354 | AcquireTerminalFlags flags, |
288a74cc RC |
355 | usec_t timeout) { |
356 | ||
8854d795 LP |
357 | _cleanup_close_ int notify = -1, fd = -1; |
358 | usec_t ts = USEC_INFINITY; | |
359 | int r, wd = -1; | |
288a74cc RC |
360 | |
361 | assert(name); | |
8854d795 | 362 | assert(IN_SET(flags & ~ACQUIRE_TERMINAL_PERMISSIVE, ACQUIRE_TERMINAL_TRY, ACQUIRE_TERMINAL_FORCE, ACQUIRE_TERMINAL_WAIT)); |
288a74cc | 363 | |
8854d795 LP |
364 | /* We use inotify to be notified when the tty is closed. We create the watch before checking if we can actually |
365 | * acquire it, so that we don't lose any event. | |
288a74cc | 366 | * |
8854d795 LP |
367 | * Note: strictly speaking this actually watches for the device being closed, it does *not* really watch |
368 | * whether a tty loses its controlling process. However, unless some rogue process uses TIOCNOTTY on /dev/tty | |
f95dbcc2 ZJS |
369 | * *after* closing its tty otherwise this will not become a problem. As long as the administrator makes sure to |
370 | * not configure any service on the same tty as an untrusted user this should not be a problem. (Which they | |
8854d795 LP |
371 | * probably should not do anyway.) */ |
372 | ||
373 | if ((flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_WAIT) { | |
288a74cc | 374 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); |
8854d795 LP |
375 | if (notify < 0) |
376 | return -errno; | |
288a74cc RC |
377 | |
378 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
8854d795 LP |
379 | if (wd < 0) |
380 | return -errno; | |
381 | ||
382 | if (timeout != USEC_INFINITY) | |
383 | ts = now(CLOCK_MONOTONIC); | |
288a74cc RC |
384 | } |
385 | ||
386 | for (;;) { | |
387 | struct sigaction sa_old, sa_new = { | |
388 | .sa_handler = SIG_IGN, | |
389 | .sa_flags = SA_RESTART, | |
390 | }; | |
391 | ||
392 | if (notify >= 0) { | |
393 | r = flush_fd(notify); | |
394 | if (r < 0) | |
8854d795 | 395 | return r; |
288a74cc RC |
396 | } |
397 | ||
8854d795 LP |
398 | /* We pass here O_NOCTTY only so that we can check the return value TIOCSCTTY and have a reliable way |
399 | * to figure out if we successfully became the controlling process of the tty */ | |
288a74cc RC |
400 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); |
401 | if (fd < 0) | |
402 | return fd; | |
403 | ||
8854d795 | 404 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed if we already own the tty. */ |
288a74cc RC |
405 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); |
406 | ||
407 | /* First, try to get the tty */ | |
8854d795 LP |
408 | r = ioctl(fd, TIOCSCTTY, |
409 | (flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_FORCE) < 0 ? -errno : 0; | |
288a74cc | 410 | |
8854d795 | 411 | /* Reset signal handler to old value */ |
288a74cc RC |
412 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); |
413 | ||
8854d795 LP |
414 | /* Success? Exit the loop now! */ |
415 | if (r >= 0) | |
416 | break; | |
288a74cc | 417 | |
8854d795 LP |
418 | /* Any failure besides -EPERM? Fail, regardless of the mode. */ |
419 | if (r != -EPERM) | |
420 | return r; | |
288a74cc | 421 | |
8854d795 LP |
422 | if (flags & ACQUIRE_TERMINAL_PERMISSIVE) /* If we are in permissive mode, then EPERM is fine, turn this |
423 | * into a success. Note that EPERM is also returned if we | |
424 | * already are the owner of the TTY. */ | |
288a74cc RC |
425 | break; |
426 | ||
8854d795 LP |
427 | if (flags != ACQUIRE_TERMINAL_WAIT) /* If we are in TRY or FORCE mode, then propagate EPERM as EPERM */ |
428 | return r; | |
429 | ||
288a74cc | 430 | assert(notify >= 0); |
8854d795 | 431 | assert(wd >= 0); |
288a74cc RC |
432 | |
433 | for (;;) { | |
434 | union inotify_event_buffer buffer; | |
435 | struct inotify_event *e; | |
436 | ssize_t l; | |
437 | ||
438 | if (timeout != USEC_INFINITY) { | |
439 | usec_t n; | |
440 | ||
8854d795 LP |
441 | assert(ts != USEC_INFINITY); |
442 | ||
496db330 YW |
443 | n = usec_sub_unsigned(now(CLOCK_MONOTONIC), ts); |
444 | if (n >= timeout) | |
8854d795 | 445 | return -ETIMEDOUT; |
288a74cc | 446 | |
496db330 | 447 | r = fd_wait_for_event(notify, POLLIN, usec_sub_unsigned(timeout, n)); |
288a74cc | 448 | if (r < 0) |
8854d795 LP |
449 | return r; |
450 | if (r == 0) | |
451 | return -ETIMEDOUT; | |
288a74cc RC |
452 | } |
453 | ||
454 | l = read(notify, &buffer, sizeof(buffer)); | |
455 | if (l < 0) { | |
3742095b | 456 | if (IN_SET(errno, EINTR, EAGAIN)) |
288a74cc RC |
457 | continue; |
458 | ||
8854d795 | 459 | return -errno; |
288a74cc RC |
460 | } |
461 | ||
462 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
8854d795 LP |
463 | if (e->mask & IN_Q_OVERFLOW) /* If we hit an inotify queue overflow, simply check if the terminal is up for grabs now. */ |
464 | break; | |
465 | ||
466 | if (e->wd != wd || !(e->mask & IN_CLOSE)) /* Safety checks */ | |
467 | return -EIO; | |
288a74cc RC |
468 | } |
469 | ||
470 | break; | |
471 | } | |
472 | ||
8854d795 LP |
473 | /* We close the tty fd here since if the old session ended our handle will be dead. It's important that |
474 | * we do this after sleeping, so that we don't enter an endless loop. */ | |
288a74cc RC |
475 | fd = safe_close(fd); |
476 | } | |
477 | ||
c10d6bdb | 478 | return TAKE_FD(fd); |
288a74cc RC |
479 | } |
480 | ||
481 | int release_terminal(void) { | |
482 | static const struct sigaction sa_new = { | |
483 | .sa_handler = SIG_IGN, | |
484 | .sa_flags = SA_RESTART, | |
485 | }; | |
486 | ||
487 | _cleanup_close_ int fd = -1; | |
488 | struct sigaction sa_old; | |
87964ec7 | 489 | int r; |
288a74cc | 490 | |
0a8b555c | 491 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
492 | if (fd < 0) |
493 | return -errno; | |
494 | ||
495 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
496 | * by our own TIOCNOTTY */ | |
497 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
498 | ||
87964ec7 | 499 | r = ioctl(fd, TIOCNOTTY) < 0 ? -errno : 0; |
288a74cc RC |
500 | |
501 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
502 | ||
503 | return r; | |
504 | } | |
505 | ||
506 | int terminal_vhangup_fd(int fd) { | |
507 | assert(fd >= 0); | |
508 | ||
509 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
510 | return -errno; | |
511 | ||
512 | return 0; | |
513 | } | |
514 | ||
515 | int terminal_vhangup(const char *name) { | |
516 | _cleanup_close_ int fd; | |
517 | ||
0a8b555c | 518 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
519 | if (fd < 0) |
520 | return fd; | |
521 | ||
522 | return terminal_vhangup_fd(fd); | |
523 | } | |
524 | ||
525 | int vt_disallocate(const char *name) { | |
ba5d26cc | 526 | const char *e; |
1ba23931 | 527 | int r; |
288a74cc RC |
528 | |
529 | /* Deallocate the VT if possible. If not possible | |
530 | * (i.e. because it is the active one), at least clear it | |
ba5d26cc | 531 | * entirely (including the scrollback buffer). */ |
288a74cc | 532 | |
27458ed6 LP |
533 | e = path_startswith(name, "/dev/"); |
534 | if (!e) | |
288a74cc RC |
535 | return -EINVAL; |
536 | ||
ba5d26cc ZJS |
537 | if (tty_is_vc(name)) { |
538 | _cleanup_close_ int fd = -1; | |
539 | unsigned u; | |
540 | const char *n; | |
288a74cc | 541 | |
ba5d26cc ZJS |
542 | n = startswith(e, "tty"); |
543 | if (!n) | |
544 | return -EINVAL; | |
288a74cc | 545 | |
ba5d26cc ZJS |
546 | r = safe_atou(n, &u); |
547 | if (r < 0) | |
548 | return r; | |
288a74cc | 549 | |
ba5d26cc ZJS |
550 | if (u <= 0) |
551 | return -EINVAL; | |
288a74cc | 552 | |
ba5d26cc ZJS |
553 | /* Try to deallocate */ |
554 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
555 | if (fd < 0) | |
556 | return fd; | |
288a74cc | 557 | |
ba5d26cc ZJS |
558 | r = ioctl(fd, VT_DISALLOCATE, u); |
559 | if (r >= 0) | |
560 | return 0; | |
561 | if (errno != EBUSY) | |
562 | return -errno; | |
563 | } | |
288a74cc | 564 | |
ba5d26cc ZJS |
565 | /* So this is not a VT (in which case we cannot deallocate it), |
566 | * or we failed to deallocate. Let's at least clear the screen. */ | |
288a74cc | 567 | |
ba5d26cc ZJS |
568 | _cleanup_close_ int fd2 = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); |
569 | if (fd2 < 0) | |
570 | return fd2; | |
288a74cc | 571 | |
ba5d26cc ZJS |
572 | (void) loop_write(fd2, |
573 | "\033[r" /* clear scrolling region */ | |
574 | "\033[H" /* move home */ | |
575 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
576 | 10, false); | |
288a74cc RC |
577 | return 0; |
578 | } | |
579 | ||
288a74cc RC |
580 | int make_console_stdio(void) { |
581 | int fd, r; | |
582 | ||
9281e703 LP |
583 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr, if we can. If we can't use |
584 | * /dev/null instead. This is particularly useful if /dev/console is turned off, e.g. if console=null | |
585 | * is specified on the kernel command line. */ | |
288a74cc | 586 | |
8854d795 | 587 | fd = acquire_terminal("/dev/console", ACQUIRE_TERMINAL_FORCE|ACQUIRE_TERMINAL_PERMISSIVE, USEC_INFINITY); |
9281e703 LP |
588 | if (fd < 0) { |
589 | log_warning_errno(fd, "Failed to acquire terminal, using /dev/null stdin/stdout/stderr instead: %m"); | |
288a74cc | 590 | |
9281e703 LP |
591 | r = make_null_stdio(); |
592 | if (r < 0) | |
593 | return log_error_errno(r, "Failed to make /dev/null stdin/stdout/stderr: %m"); | |
3d18b167 | 594 | |
9281e703 LP |
595 | } else { |
596 | r = reset_terminal_fd(fd, true); | |
597 | if (r < 0) | |
598 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
288a74cc | 599 | |
9281e703 LP |
600 | r = rearrange_stdio(fd, fd, fd); /* This invalidates 'fd' both on success and on failure. */ |
601 | if (r < 0) | |
602 | return log_error_errno(r, "Failed to make terminal stdin/stdout/stderr: %m"); | |
603 | } | |
c6063244 | 604 | |
9281e703 | 605 | reset_terminal_feature_caches(); |
288a74cc RC |
606 | return 0; |
607 | } | |
608 | ||
288a74cc RC |
609 | bool tty_is_vc(const char *tty) { |
610 | assert(tty); | |
611 | ||
612 | return vtnr_from_tty(tty) >= 0; | |
613 | } | |
614 | ||
615 | bool tty_is_console(const char *tty) { | |
616 | assert(tty); | |
617 | ||
a119ec7c | 618 | return streq(skip_dev_prefix(tty), "console"); |
288a74cc RC |
619 | } |
620 | ||
621 | int vtnr_from_tty(const char *tty) { | |
622 | int i, r; | |
623 | ||
624 | assert(tty); | |
625 | ||
a119ec7c | 626 | tty = skip_dev_prefix(tty); |
288a74cc RC |
627 | |
628 | if (!startswith(tty, "tty") ) | |
629 | return -EINVAL; | |
630 | ||
631 | if (tty[3] < '0' || tty[3] > '9') | |
632 | return -EINVAL; | |
633 | ||
634 | r = safe_atoi(tty+3, &i); | |
635 | if (r < 0) | |
636 | return r; | |
637 | ||
638 | if (i < 0 || i > 63) | |
639 | return -EINVAL; | |
640 | ||
641 | return i; | |
642 | } | |
643 | ||
7b912648 LP |
644 | int resolve_dev_console(char **ret) { |
645 | _cleanup_free_ char *active = NULL; | |
288a74cc | 646 | char *tty; |
7b912648 | 647 | int r; |
288a74cc | 648 | |
7b912648 LP |
649 | assert(ret); |
650 | ||
651 | /* Resolve where /dev/console is pointing to, if /sys is actually ours (i.e. not read-only-mounted which is a | |
652 | * sign for container setups) */ | |
288a74cc RC |
653 | |
654 | if (path_is_read_only_fs("/sys") > 0) | |
7b912648 | 655 | return -ENOMEDIUM; |
288a74cc | 656 | |
7b912648 LP |
657 | r = read_one_line_file("/sys/class/tty/console/active", &active); |
658 | if (r < 0) | |
659 | return r; | |
288a74cc | 660 | |
7b912648 LP |
661 | /* If multiple log outputs are configured the last one is what /dev/console points to */ |
662 | tty = strrchr(active, ' '); | |
288a74cc RC |
663 | if (tty) |
664 | tty++; | |
665 | else | |
7b912648 | 666 | tty = active; |
288a74cc RC |
667 | |
668 | if (streq(tty, "tty0")) { | |
7b912648 | 669 | active = mfree(active); |
288a74cc RC |
670 | |
671 | /* Get the active VC (e.g. tty1) */ | |
7b912648 LP |
672 | r = read_one_line_file("/sys/class/tty/tty0/active", &active); |
673 | if (r < 0) | |
674 | return r; | |
675 | ||
676 | tty = active; | |
677 | } | |
678 | ||
ae2a15bc LP |
679 | if (tty == active) |
680 | *ret = TAKE_PTR(active); | |
681 | else { | |
7b912648 LP |
682 | char *tmp; |
683 | ||
684 | tmp = strdup(tty); | |
685 | if (!tmp) | |
686 | return -ENOMEM; | |
687 | ||
688 | *ret = tmp; | |
288a74cc RC |
689 | } |
690 | ||
7b912648 | 691 | return 0; |
288a74cc RC |
692 | } |
693 | ||
bef41af2 LP |
694 | int get_kernel_consoles(char ***ret) { |
695 | _cleanup_strv_free_ char **l = NULL; | |
6af62124 | 696 | _cleanup_free_ char *line = NULL; |
bef41af2 | 697 | const char *p; |
6af62124 WF |
698 | int r; |
699 | ||
bef41af2 LP |
700 | assert(ret); |
701 | ||
f95dbcc2 | 702 | /* If /sys is mounted read-only this means we are running in some kind of container environment. In that |
bef41af2 LP |
703 | * case /sys would reflect the host system, not us, hence ignore the data we can read from it. */ |
704 | if (path_is_read_only_fs("/sys") > 0) | |
705 | goto fallback; | |
6af62124 WF |
706 | |
707 | r = read_one_line_file("/sys/class/tty/console/active", &line); | |
708 | if (r < 0) | |
709 | return r; | |
710 | ||
bef41af2 | 711 | p = line; |
6af62124 | 712 | for (;;) { |
6abdec98 | 713 | _cleanup_free_ char *tty = NULL, *path = NULL; |
6af62124 | 714 | |
bef41af2 | 715 | r = extract_first_word(&p, &tty, NULL, 0); |
6af62124 WF |
716 | if (r < 0) |
717 | return r; | |
718 | if (r == 0) | |
719 | break; | |
720 | ||
721 | if (streq(tty, "tty0")) { | |
722 | tty = mfree(tty); | |
723 | r = read_one_line_file("/sys/class/tty/tty0/active", &tty); | |
724 | if (r < 0) | |
725 | return r; | |
726 | } | |
727 | ||
6abdec98 | 728 | path = path_join("/dev", tty); |
6af62124 WF |
729 | if (!path) |
730 | return -ENOMEM; | |
731 | ||
732 | if (access(path, F_OK) < 0) { | |
733 | log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path); | |
6af62124 WF |
734 | continue; |
735 | } | |
736 | ||
6abdec98 | 737 | r = strv_consume(&l, TAKE_PTR(path)); |
6af62124 WF |
738 | if (r < 0) |
739 | return r; | |
740 | } | |
741 | ||
bef41af2 | 742 | if (strv_isempty(l)) { |
6af62124 | 743 | log_debug("No devices found for system console"); |
bef41af2 | 744 | goto fallback; |
6af62124 WF |
745 | } |
746 | ||
ae2a15bc | 747 | *ret = TAKE_PTR(l); |
bef41af2 LP |
748 | |
749 | return 0; | |
750 | ||
751 | fallback: | |
752 | r = strv_extend(&l, "/dev/console"); | |
753 | if (r < 0) | |
754 | return r; | |
755 | ||
ae2a15bc | 756 | *ret = TAKE_PTR(l); |
bef41af2 | 757 | |
6af62124 WF |
758 | return 0; |
759 | } | |
760 | ||
288a74cc | 761 | bool tty_is_vc_resolve(const char *tty) { |
7b912648 | 762 | _cleanup_free_ char *resolved = NULL; |
288a74cc RC |
763 | |
764 | assert(tty); | |
765 | ||
a119ec7c | 766 | tty = skip_dev_prefix(tty); |
288a74cc RC |
767 | |
768 | if (streq(tty, "console")) { | |
7b912648 | 769 | if (resolve_dev_console(&resolved) < 0) |
288a74cc | 770 | return false; |
7b912648 LP |
771 | |
772 | tty = resolved; | |
288a74cc RC |
773 | } |
774 | ||
775 | return tty_is_vc(tty); | |
776 | } | |
777 | ||
778 | const char *default_term_for_tty(const char *tty) { | |
6af760f3 | 779 | return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220"; |
288a74cc RC |
780 | } |
781 | ||
782 | int fd_columns(int fd) { | |
783 | struct winsize ws = {}; | |
784 | ||
14f594b9 LP |
785 | if (fd < 0) |
786 | return -EBADF; | |
787 | ||
288a74cc RC |
788 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) |
789 | return -errno; | |
790 | ||
791 | if (ws.ws_col <= 0) | |
792 | return -EIO; | |
793 | ||
794 | return ws.ws_col; | |
795 | } | |
796 | ||
797 | unsigned columns(void) { | |
798 | const char *e; | |
799 | int c; | |
800 | ||
c6063244 | 801 | if (cached_columns > 0) |
288a74cc RC |
802 | return cached_columns; |
803 | ||
804 | c = 0; | |
805 | e = getenv("COLUMNS"); | |
806 | if (e) | |
807 | (void) safe_atoi(e, &c); | |
808 | ||
d09a7135 | 809 | if (c <= 0 || c > USHRT_MAX) { |
288a74cc | 810 | c = fd_columns(STDOUT_FILENO); |
d09a7135 LP |
811 | if (c <= 0) |
812 | c = 80; | |
813 | } | |
288a74cc RC |
814 | |
815 | cached_columns = c; | |
816 | return cached_columns; | |
817 | } | |
818 | ||
819 | int fd_lines(int fd) { | |
820 | struct winsize ws = {}; | |
821 | ||
14f594b9 LP |
822 | if (fd < 0) |
823 | return -EBADF; | |
824 | ||
288a74cc RC |
825 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) |
826 | return -errno; | |
827 | ||
828 | if (ws.ws_row <= 0) | |
829 | return -EIO; | |
830 | ||
831 | return ws.ws_row; | |
832 | } | |
833 | ||
834 | unsigned lines(void) { | |
835 | const char *e; | |
836 | int l; | |
837 | ||
c6063244 | 838 | if (cached_lines > 0) |
288a74cc RC |
839 | return cached_lines; |
840 | ||
841 | l = 0; | |
842 | e = getenv("LINES"); | |
843 | if (e) | |
844 | (void) safe_atoi(e, &l); | |
845 | ||
d09a7135 | 846 | if (l <= 0 || l > USHRT_MAX) { |
288a74cc | 847 | l = fd_lines(STDOUT_FILENO); |
d09a7135 LP |
848 | if (l <= 0) |
849 | l = 24; | |
850 | } | |
288a74cc RC |
851 | |
852 | cached_lines = l; | |
853 | return cached_lines; | |
854 | } | |
855 | ||
856 | /* intended to be used as a SIGWINCH sighandler */ | |
857 | void columns_lines_cache_reset(int signum) { | |
858 | cached_columns = 0; | |
859 | cached_lines = 0; | |
860 | } | |
861 | ||
c6063244 LP |
862 | void reset_terminal_feature_caches(void) { |
863 | cached_columns = 0; | |
864 | cached_lines = 0; | |
865 | ||
c4fea19a | 866 | cached_color_mode = _COLOR_INVALID; |
c6063244 LP |
867 | cached_underline_enabled = -1; |
868 | cached_on_tty = -1; | |
869 | } | |
288a74cc | 870 | |
c6063244 | 871 | bool on_tty(void) { |
8cd0356e LP |
872 | |
873 | /* We check both stdout and stderr, so that situations where pipes on the shell are used are reliably | |
874 | * recognized, regardless if only the output or the errors are piped to some place. Since on_tty() is generally | |
875 | * used to default to a safer, non-interactive, non-color mode of operation it's probably good to be defensive | |
876 | * here, and check for both. Note that we don't check for STDIN_FILENO, because it should fine to use fancy | |
877 | * terminal functionality when outputting stuff, even if the input is piped to us. */ | |
878 | ||
c6063244 | 879 | if (cached_on_tty < 0) |
8cd0356e LP |
880 | cached_on_tty = |
881 | isatty(STDOUT_FILENO) > 0 && | |
882 | isatty(STDERR_FILENO) > 0; | |
288a74cc RC |
883 | |
884 | return cached_on_tty; | |
885 | } | |
886 | ||
288a74cc | 887 | int getttyname_malloc(int fd, char **ret) { |
30222f4b | 888 | char path[PATH_MAX], *c; /* PATH_MAX is counted *with* the trailing NUL byte */ |
288a74cc RC |
889 | int r; |
890 | ||
891 | assert(fd >= 0); | |
892 | assert(ret); | |
893 | ||
30222f4b ZJS |
894 | r = ttyname_r(fd, path, sizeof path); /* positive error */ |
895 | assert(r >= 0); | |
896 | if (r == ERANGE) | |
897 | return -ENAMETOOLONG; | |
898 | if (r > 0) | |
899 | return -r; | |
288a74cc | 900 | |
30222f4b ZJS |
901 | c = strdup(skip_dev_prefix(path)); |
902 | if (!c) | |
903 | return -ENOMEM; | |
288a74cc | 904 | |
30222f4b | 905 | *ret = c; |
288a74cc RC |
906 | return 0; |
907 | } | |
908 | ||
f171decd LP |
909 | int getttyname_harder(int fd, char **ret) { |
910 | _cleanup_free_ char *s = NULL; | |
911 | int r; | |
288a74cc | 912 | |
f171decd LP |
913 | r = getttyname_malloc(fd, &s); |
914 | if (r < 0) | |
915 | return r; | |
288a74cc | 916 | |
f171decd LP |
917 | if (streq(s, "tty")) |
918 | return get_ctty(0, NULL, ret); | |
288a74cc | 919 | |
f171decd | 920 | *ret = TAKE_PTR(s); |
288a74cc RC |
921 | return 0; |
922 | } | |
923 | ||
924 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
925 | int r; | |
926 | _cleanup_free_ char *line = NULL; | |
927 | const char *p; | |
928 | unsigned long ttynr; | |
929 | ||
930 | assert(pid >= 0); | |
931 | ||
932 | p = procfs_file_alloca(pid, "stat"); | |
933 | r = read_one_line_file(p, &line); | |
934 | if (r < 0) | |
935 | return r; | |
936 | ||
937 | p = strrchr(line, ')'); | |
938 | if (!p) | |
939 | return -EIO; | |
940 | ||
941 | p++; | |
942 | ||
943 | if (sscanf(p, " " | |
944 | "%*c " /* state */ | |
945 | "%*d " /* ppid */ | |
946 | "%*d " /* pgrp */ | |
947 | "%*d " /* session */ | |
948 | "%lu ", /* ttynr */ | |
949 | &ttynr) != 1) | |
950 | return -EIO; | |
951 | ||
952 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
cfeaa44a | 953 | return -ENXIO; |
288a74cc RC |
954 | |
955 | if (d) | |
956 | *d = (dev_t) ttynr; | |
957 | ||
958 | return 0; | |
959 | } | |
960 | ||
54b22b26 LP |
961 | int get_ctty(pid_t pid, dev_t *ret_devnr, char **ret) { |
962 | _cleanup_free_ char *fn = NULL, *b = NULL; | |
288a74cc | 963 | dev_t devnr; |
54b22b26 | 964 | int r; |
288a74cc | 965 | |
54b22b26 LP |
966 | r = get_ctty_devnr(pid, &devnr); |
967 | if (r < 0) | |
968 | return r; | |
288a74cc | 969 | |
54b22b26 LP |
970 | r = device_path_make_canonical(S_IFCHR, devnr, &fn); |
971 | if (r < 0) { | |
972 | if (r != -ENOENT) /* No symlink for this in /dev/char/? */ | |
973 | return r; | |
288a74cc | 974 | |
288a74cc | 975 | if (major(devnr) == 136) { |
54b22b26 LP |
976 | /* This is an ugly hack: PTY devices are not listed in /dev/char/, as they don't follow the |
977 | * Linux device model. This means we have no nice way to match them up against their actual | |
978 | * device node. Let's hence do the check by the fixed, assigned major number. Normally we try | |
979 | * to avoid such fixed major/minor matches, but there appears to nother nice way to handle | |
980 | * this. */ | |
981 | ||
288a74cc RC |
982 | if (asprintf(&b, "pts/%u", minor(devnr)) < 0) |
983 | return -ENOMEM; | |
984 | } else { | |
54b22b26 LP |
985 | /* Probably something similar to the ptys which have no symlink in /dev/char/. Let's return |
986 | * something vaguely useful. */ | |
288a74cc | 987 | |
54b22b26 LP |
988 | r = device_path_make_major_minor(S_IFCHR, devnr, &fn); |
989 | if (r < 0) | |
990 | return r; | |
288a74cc | 991 | } |
54b22b26 | 992 | } |
288a74cc | 993 | |
54b22b26 LP |
994 | if (!b) { |
995 | const char *w; | |
996 | ||
997 | w = path_startswith(fn, "/dev/"); | |
998 | if (w) { | |
999 | b = strdup(w); | |
1000 | if (!b) | |
1001 | return -ENOMEM; | |
1002 | } else | |
1003 | b = TAKE_PTR(fn); | |
288a74cc RC |
1004 | } |
1005 | ||
54b22b26 LP |
1006 | if (ret) |
1007 | *ret = TAKE_PTR(b); | |
1008 | ||
1009 | if (ret_devnr) | |
1010 | *ret_devnr = devnr; | |
288a74cc RC |
1011 | |
1012 | return 0; | |
1013 | } | |
a07c35c3 | 1014 | |
66cb2fde LP |
1015 | int ptsname_malloc(int fd, char **ret) { |
1016 | size_t l = 100; | |
1017 | ||
1018 | assert(fd >= 0); | |
1019 | assert(ret); | |
1020 | ||
1021 | for (;;) { | |
1022 | char *c; | |
1023 | ||
1024 | c = new(char, l); | |
1025 | if (!c) | |
1026 | return -ENOMEM; | |
1027 | ||
1028 | if (ptsname_r(fd, c, l) == 0) { | |
1029 | *ret = c; | |
1030 | return 0; | |
1031 | } | |
1032 | if (errno != ERANGE) { | |
1033 | free(c); | |
1034 | return -errno; | |
1035 | } | |
1036 | ||
1037 | free(c); | |
1fd4c4ed LP |
1038 | |
1039 | if (l > SIZE_MAX / 2) | |
1040 | return -ENOMEM; | |
1041 | ||
66cb2fde LP |
1042 | l *= 2; |
1043 | } | |
1044 | } | |
1045 | ||
ae1d13db FB |
1046 | int openpt_allocate(int flags, char **ret_slave) { |
1047 | _cleanup_close_ int fd = -1; | |
1048 | _cleanup_free_ char *p = NULL; | |
1049 | int r; | |
1050 | ||
1051 | fd = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); | |
1052 | if (fd < 0) | |
1053 | return -errno; | |
1054 | ||
1055 | if (ret_slave) { | |
1056 | r = ptsname_malloc(fd, &p); | |
1057 | if (r < 0) | |
1058 | return r; | |
1059 | ||
1060 | if (!path_startswith(p, "/dev/pts/")) | |
1061 | return -EINVAL; | |
1062 | } | |
1063 | ||
1064 | if (unlockpt(fd) < 0) | |
1065 | return -errno; | |
1066 | ||
1067 | if (ret_slave) | |
1068 | *ret_slave = TAKE_PTR(p); | |
1069 | ||
1070 | return TAKE_FD(fd); | |
1071 | } | |
1072 | ||
1073 | static int ptsname_namespace(int pty, char **ret) { | |
a07c35c3 LP |
1074 | int no = -1, r; |
1075 | ||
1076 | /* Like ptsname(), but doesn't assume that the path is | |
1077 | * accessible in the local namespace. */ | |
1078 | ||
1079 | r = ioctl(pty, TIOCGPTN, &no); | |
1080 | if (r < 0) | |
1081 | return -errno; | |
1082 | ||
1083 | if (no < 0) | |
1084 | return -EIO; | |
1085 | ||
1086 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1087 | return -ENOMEM; | |
1088 | ||
1089 | return 0; | |
1090 | } | |
66cb2fde | 1091 | |
ae1d13db FB |
1092 | int openpt_allocate_in_namespace(pid_t pid, int flags, char **ret_slave) { |
1093 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1, fd = -1; | |
66cb2fde | 1094 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; |
66cb2fde LP |
1095 | pid_t child; |
1096 | int r; | |
1097 | ||
1098 | assert(pid > 0); | |
1099 | ||
1100 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1101 | if (r < 0) | |
1102 | return r; | |
1103 | ||
1104 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1105 | return -errno; | |
1106 | ||
1edcb6a9 LP |
1107 | r = namespace_fork("(sd-openptns)", "(sd-openpt)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG, |
1108 | pidnsfd, mntnsfd, -1, usernsfd, rootfd, &child); | |
4c253ed1 LP |
1109 | if (r < 0) |
1110 | return r; | |
1111 | if (r == 0) { | |
66cb2fde LP |
1112 | pair[0] = safe_close(pair[0]); |
1113 | ||
ae1d13db FB |
1114 | fd = openpt_allocate(flags, NULL); |
1115 | if (fd < 0) | |
66cb2fde LP |
1116 | _exit(EXIT_FAILURE); |
1117 | ||
ae1d13db | 1118 | if (send_one_fd(pair[1], fd, 0) < 0) |
66cb2fde LP |
1119 | _exit(EXIT_FAILURE); |
1120 | ||
1121 | _exit(EXIT_SUCCESS); | |
1122 | } | |
1123 | ||
1124 | pair[1] = safe_close(pair[1]); | |
1125 | ||
1edcb6a9 | 1126 | r = wait_for_terminate_and_check("(sd-openptns)", child, 0); |
66cb2fde LP |
1127 | if (r < 0) |
1128 | return r; | |
2e87a1fd | 1129 | if (r != EXIT_SUCCESS) |
66cb2fde LP |
1130 | return -EIO; |
1131 | ||
ae1d13db FB |
1132 | fd = receive_one_fd(pair[0], 0); |
1133 | if (fd < 0) | |
1134 | return fd; | |
1135 | ||
1136 | if (ret_slave) { | |
1137 | r = ptsname_namespace(fd, ret_slave); | |
1138 | if (r < 0) | |
1139 | return r; | |
1140 | } | |
1141 | ||
1142 | return TAKE_FD(fd); | |
66cb2fde | 1143 | } |
40e1f4ea LP |
1144 | |
1145 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
1146 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1147 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
40e1f4ea LP |
1148 | pid_t child; |
1149 | int r; | |
1150 | ||
1151 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1152 | if (r < 0) | |
1153 | return r; | |
1154 | ||
1155 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1156 | return -errno; | |
1157 | ||
1edcb6a9 LP |
1158 | r = namespace_fork("(sd-terminalns)", "(sd-terminal)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG, |
1159 | pidnsfd, mntnsfd, -1, usernsfd, rootfd, &child); | |
4c253ed1 LP |
1160 | if (r < 0) |
1161 | return r; | |
1162 | if (r == 0) { | |
40e1f4ea LP |
1163 | int master; |
1164 | ||
1165 | pair[0] = safe_close(pair[0]); | |
1166 | ||
40e1f4ea LP |
1167 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); |
1168 | if (master < 0) | |
1169 | _exit(EXIT_FAILURE); | |
1170 | ||
1171 | if (send_one_fd(pair[1], master, 0) < 0) | |
1172 | _exit(EXIT_FAILURE); | |
1173 | ||
1174 | _exit(EXIT_SUCCESS); | |
1175 | } | |
1176 | ||
1177 | pair[1] = safe_close(pair[1]); | |
1178 | ||
1edcb6a9 | 1179 | r = wait_for_terminate_and_check("(sd-terminalns)", child, 0); |
40e1f4ea LP |
1180 | if (r < 0) |
1181 | return r; | |
2e87a1fd | 1182 | if (r != EXIT_SUCCESS) |
40e1f4ea LP |
1183 | return -EIO; |
1184 | ||
1185 | return receive_one_fd(pair[0], 0); | |
1186 | } | |
40c9fe4c | 1187 | |
158fbf76 | 1188 | static bool getenv_terminal_is_dumb(void) { |
ac96418b LP |
1189 | const char *e; |
1190 | ||
ac96418b LP |
1191 | e = getenv("TERM"); |
1192 | if (!e) | |
1193 | return true; | |
1194 | ||
1195 | return streq(e, "dumb"); | |
1196 | } | |
1197 | ||
158fbf76 ZJS |
1198 | bool terminal_is_dumb(void) { |
1199 | if (!on_tty()) | |
1200 | return true; | |
1201 | ||
1202 | return getenv_terminal_is_dumb(); | |
1203 | } | |
1204 | ||
c4fea19a MGR |
1205 | static ColorMode parse_systemd_colors(void) { |
1206 | const char *e; | |
1207 | int r; | |
ae5b3958 | 1208 | |
c4fea19a MGR |
1209 | e = getenv("SYSTEMD_COLORS"); |
1210 | if (!e) | |
1211 | return _COLOR_INVALID; | |
1212 | if (streq(e, "16")) | |
1213 | return COLOR_16; | |
1214 | if (streq(e, "256")) | |
1215 | return COLOR_256; | |
1216 | r = parse_boolean(e); | |
1217 | if (r >= 0) | |
1218 | return r > 0 ? COLOR_ON : COLOR_OFF; | |
1219 | return _COLOR_INVALID; | |
1220 | } | |
c484315b | 1221 | |
c4fea19a MGR |
1222 | ColorMode get_color_mode(void) { |
1223 | ||
1224 | /* Returns the mode used to choose output colors. The possible modes are COLOR_OFF for no colors, | |
1225 | * COLOR_16 for only the base 16 ANSI colors, COLOR_256 for more colors and COLOR_ON for unrestricted | |
1226 | * color output. For that we check $SYSTEMD_COLORS first (which is the explicit way to | |
1227 | * change the mode). If that didn't work we turn colors off unless we are on a TTY. And if we are on a TTY | |
1228 | * we turn it off if $TERM is set to "dumb". There's one special tweak though: if we are PID 1 then we do not | |
1229 | * check whether we are connected to a TTY, because we don't keep /dev/console open continuously due to fear | |
1230 | * of SAK, and hence things are a bit weird. */ | |
1231 | ColorMode m; | |
1232 | ||
1233 | if (cached_color_mode < 0) { | |
1234 | m = parse_systemd_colors(); | |
1235 | if (m >= 0) | |
1236 | cached_color_mode = m; | |
c484315b ZJS |
1237 | else if (getenv("NO_COLOR")) |
1238 | /* We only check for the presence of the variable; value is ignored. */ | |
c4fea19a | 1239 | cached_color_mode = COLOR_OFF; |
c484315b | 1240 | |
df0ff127 | 1241 | else if (getpid_cached() == 1) |
c4fea19a | 1242 | /* PID1 outputs to the console without holding it open all the time. |
ddbf9605 LP |
1243 | * |
1244 | * Note that the Linux console can only display 16 colors. We still enable 256 color | |
1245 | * mode even for PID1 output though (which typically goes to the Linux console), | |
1246 | * since the Linux console is able to parse the 256 color sequences and automatically | |
1247 | * map them to the closest color in the 16 color palette (since kernel 3.16). Doing | |
1248 | * 256 colors is nice for people who invoke systemd in a container or via a serial | |
1249 | * link or such, and use a true 256 color terminal to do so. */ | |
1250 | cached_color_mode = getenv_terminal_is_dumb() ? COLOR_OFF : COLOR_256; | |
ae5b3958 | 1251 | else |
c4fea19a | 1252 | cached_color_mode = terminal_is_dumb() ? COLOR_OFF : COLOR_256; |
40c9fe4c JS |
1253 | } |
1254 | ||
c4fea19a MGR |
1255 | return cached_color_mode; |
1256 | } | |
1257 | ||
c2b32159 LP |
1258 | bool dev_console_colors_enabled(void) { |
1259 | _cleanup_free_ char *s = NULL; | |
c4fea19a | 1260 | ColorMode m; |
c2b32159 LP |
1261 | |
1262 | /* Returns true if we assume that color is supported on /dev/console. | |
1263 | * | |
1264 | * For that we first check if we explicitly got told to use colors or not, by checking $SYSTEMD_COLORS. If that | |
f95dbcc2 ZJS |
1265 | * isn't set we check whether PID 1 has $TERM set, and if not, whether TERM is set on the kernel command |
1266 | * line. If we find $TERM set we assume color if it's not set to "dumb", similarly to how regular | |
c2b32159 LP |
1267 | * colors_enabled() operates. */ |
1268 | ||
c4fea19a MGR |
1269 | m = parse_systemd_colors(); |
1270 | if (m >= 0) | |
1271 | return m; | |
c2b32159 | 1272 | |
c484315b ZJS |
1273 | if (getenv("NO_COLOR")) |
1274 | return false; | |
1275 | ||
c2b32159 LP |
1276 | if (getenv_for_pid(1, "TERM", &s) <= 0) |
1277 | (void) proc_cmdline_get_key("TERM", 0, &s); | |
1278 | ||
1279 | return !streq_ptr(s, "dumb"); | |
1280 | } | |
1281 | ||
526664f6 | 1282 | bool underline_enabled(void) { |
526664f6 | 1283 | |
c6063244 | 1284 | if (cached_underline_enabled < 0) { |
526664f6 LP |
1285 | |
1286 | /* The Linux console doesn't support underlining, turn it off, but only there. */ | |
1287 | ||
c6063244 LP |
1288 | if (colors_enabled()) |
1289 | cached_underline_enabled = !streq_ptr(getenv("TERM"), "linux"); | |
526664f6 | 1290 | else |
c6063244 | 1291 | cached_underline_enabled = false; |
526664f6 LP |
1292 | } |
1293 | ||
c6063244 | 1294 | return cached_underline_enabled; |
526664f6 LP |
1295 | } |
1296 | ||
c83f349c LP |
1297 | int vt_default_utf8(void) { |
1298 | _cleanup_free_ char *b = NULL; | |
1299 | int r; | |
1300 | ||
1301 | /* Read the default VT UTF8 setting from the kernel */ | |
1302 | ||
1303 | r = read_one_line_file("/sys/module/vt/parameters/default_utf8", &b); | |
1304 | if (r < 0) | |
1305 | return r; | |
1306 | ||
1307 | return parse_boolean(b); | |
1308 | } | |
1309 | ||
1310 | int vt_reset_keyboard(int fd) { | |
15bba613 | 1311 | int kb; |
c83f349c LP |
1312 | |
1313 | /* If we can't read the default, then default to unicode. It's 2017 after all. */ | |
1314 | kb = vt_default_utf8() != 0 ? K_UNICODE : K_XLATE; | |
1315 | ||
1316 | if (ioctl(fd, KDSKBMODE, kb) < 0) | |
1317 | return -errno; | |
1318 | ||
1319 | return 0; | |
1320 | } | |
6179ede1 FB |
1321 | |
1322 | int vt_restore(int fd) { | |
1323 | static const struct vt_mode mode = { | |
1324 | .mode = VT_AUTO, | |
1325 | }; | |
1326 | int r, q = 0; | |
1327 | ||
1802d5f2 | 1328 | if (ioctl(fd, KDSETMODE, KD_TEXT) < 0) |
6179ede1 FB |
1329 | q = log_debug_errno(errno, "Failed to set VT in text mode, ignoring: %m"); |
1330 | ||
1331 | r = vt_reset_keyboard(fd); | |
1332 | if (r < 0) { | |
1333 | log_debug_errno(r, "Failed to reset keyboard mode, ignoring: %m"); | |
1334 | if (q >= 0) | |
1335 | q = r; | |
1336 | } | |
1337 | ||
1802d5f2 | 1338 | if (ioctl(fd, VT_SETMODE, &mode) < 0) { |
6179ede1 FB |
1339 | log_debug_errno(errno, "Failed to set VT_AUTO mode, ignoring: %m"); |
1340 | if (q >= 0) | |
1341 | q = -errno; | |
1342 | } | |
1343 | ||
1802d5f2 | 1344 | r = fchmod_and_chown(fd, TTY_MODE, 0, (gid_t) -1); |
6179ede1 | 1345 | if (r < 0) { |
1802d5f2 | 1346 | log_debug_errno(r, "Failed to chmod()/chown() VT, ignoring: %m"); |
6179ede1 | 1347 | if (q >= 0) |
1802d5f2 | 1348 | q = r; |
6179ede1 FB |
1349 | } |
1350 | ||
1351 | return q; | |
1352 | } | |
27dafac9 FB |
1353 | |
1354 | int vt_release(int fd, bool restore) { | |
1355 | assert(fd >= 0); | |
1356 | ||
1357 | /* This function releases the VT by acknowledging the VT-switch signal | |
1358 | * sent by the kernel and optionally reset the VT in text and auto | |
1359 | * VT-switching modes. */ | |
1360 | ||
1361 | if (ioctl(fd, VT_RELDISP, 1) < 0) | |
1362 | return -errno; | |
1363 | ||
1364 | if (restore) | |
1365 | return vt_restore(fd); | |
1366 | ||
1367 | return 0; | |
1368 | } | |
37b8d2f6 ZJS |
1369 | |
1370 | void get_log_colors(int priority, const char **on, const char **off, const char **highlight) { | |
1371 | /* Note that this will initialize output variables only when there's something to output. | |
5e2b0e1c | 1372 | * The caller must pre-initialize to "" or NULL as appropriate. */ |
37b8d2f6 ZJS |
1373 | |
1374 | if (priority <= LOG_ERR) { | |
1375 | if (on) | |
25e4608b | 1376 | *on = ansi_highlight_red(); |
37b8d2f6 | 1377 | if (off) |
bb146d23 | 1378 | *off = ansi_normal(); |
37b8d2f6 | 1379 | if (highlight) |
bb146d23 | 1380 | *highlight = ansi_highlight(); |
37b8d2f6 | 1381 | |
0d0464d3 ZJS |
1382 | } else if (priority <= LOG_WARNING) { |
1383 | if (on) | |
25e4608b | 1384 | *on = ansi_highlight_yellow(); |
0d0464d3 | 1385 | if (off) |
bb146d23 | 1386 | *off = ansi_normal(); |
0d0464d3 | 1387 | if (highlight) |
bb146d23 | 1388 | *highlight = ansi_highlight(); |
0d0464d3 | 1389 | |
37b8d2f6 ZJS |
1390 | } else if (priority <= LOG_NOTICE) { |
1391 | if (on) | |
bb146d23 | 1392 | *on = ansi_highlight(); |
37b8d2f6 | 1393 | if (off) |
bb146d23 | 1394 | *off = ansi_normal(); |
37b8d2f6 | 1395 | if (highlight) |
25e4608b | 1396 | *highlight = ansi_highlight_red(); |
37b8d2f6 ZJS |
1397 | |
1398 | } else if (priority >= LOG_DEBUG) { | |
1399 | if (on) | |
25e4608b | 1400 | *on = ansi_grey(); |
37b8d2f6 | 1401 | if (off) |
bb146d23 | 1402 | *off = ansi_normal(); |
37b8d2f6 | 1403 | if (highlight) |
25e4608b | 1404 | *highlight = ansi_highlight_red(); |
37b8d2f6 ZJS |
1405 | } |
1406 | } |