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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" |
28db6fbf | 24 | #include "constants.h" |
7176f06c | 25 | #include "devnum-util.h" |
acf553b0 | 26 | #include "env-util.h" |
3ffd4af2 | 27 | #include "fd-util.h" |
288a74cc | 28 | #include "fileio.h" |
f4f15635 | 29 | #include "fs-util.h" |
9e5fd717 | 30 | #include "inotify-util.h" |
c004493c | 31 | #include "io-util.h" |
93cc7779 TA |
32 | #include "log.h" |
33 | #include "macro.h" | |
0cb8e3d1 | 34 | #include "namespace-util.h" |
6bedfcbb | 35 | #include "parse-util.h" |
c2b32159 LP |
36 | #include "path-util.h" |
37 | #include "proc-cmdline.h" | |
07630cea | 38 | #include "process-util.h" |
2583fbea | 39 | #include "socket-util.h" |
8fcde012 | 40 | #include "stat-util.h" |
11f3c130 | 41 | #include "stdio-util.h" |
07630cea | 42 | #include "string-util.h" |
6af62124 | 43 | #include "strv.h" |
3ffd4af2 | 44 | #include "terminal-util.h" |
07630cea | 45 | #include "time-util.h" |
f5fbe71d | 46 | #include "user-util.h" |
288a74cc RC |
47 | |
48 | static volatile unsigned cached_columns = 0; | |
49 | static volatile unsigned cached_lines = 0; | |
50 | ||
c6063244 | 51 | static volatile int cached_on_tty = -1; |
197dd3a9 | 52 | static volatile int cached_on_dev_null = -1; |
c4fea19a | 53 | static volatile int cached_color_mode = _COLOR_INVALID; |
c6063244 LP |
54 | static volatile int cached_underline_enabled = -1; |
55 | ||
288a74cc | 56 | int chvt(int vt) { |
254d1313 | 57 | _cleanup_close_ int fd = -EBADF; |
288a74cc | 58 | |
0295642d LP |
59 | /* Switch to the specified vt number. If the VT is specified <= 0 switch to the VT the kernel log messages go, |
60 | * if that's configured. */ | |
61 | ||
0a8b555c | 62 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
63 | if (fd < 0) |
64 | return -errno; | |
65 | ||
b9e74c39 | 66 | if (vt <= 0) { |
288a74cc RC |
67 | int tiocl[2] = { |
68 | TIOCL_GETKMSGREDIRECT, | |
69 | 0 | |
70 | }; | |
71 | ||
72 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
73 | return -errno; | |
74 | ||
75 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
76 | } | |
77 | ||
7c248223 | 78 | return RET_NERRNO(ioctl(fd, VT_ACTIVATE, vt)); |
288a74cc RC |
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 | ||
e60a4a3c LP |
242 | if (isatty(fd) < 1) |
243 | return log_debug_errno(errno, "Asked to reset a terminal that actually isn't a terminal: %m"); | |
244 | ||
245 | /* We leave locked terminal attributes untouched, so that Plymouth may set whatever it wants to set, | |
246 | * and we don't interfere with that. */ | |
288a74cc RC |
247 | |
248 | /* Disable exclusive mode, just in case */ | |
7eaee902 LP |
249 | if (ioctl(fd, TIOCNXCL) < 0) |
250 | log_debug_errno(errno, "TIOCNXCL ioctl failed on TTY, ignoring: %m"); | |
288a74cc RC |
251 | |
252 | /* Switch to text mode */ | |
253 | if (switch_to_text) | |
7eaee902 LP |
254 | if (ioctl(fd, KDSETMODE, KD_TEXT) < 0) |
255 | log_debug_errno(errno, "KDSETMODE ioctl for switching to text mode failed on TTY, ignoring: %m"); | |
256 | ||
288a74cc | 257 | |
73e669e0 | 258 | /* Set default keyboard mode */ |
c83f349c | 259 | (void) vt_reset_keyboard(fd); |
288a74cc RC |
260 | |
261 | if (tcgetattr(fd, &termios) < 0) { | |
7eaee902 | 262 | r = log_debug_errno(errno, "Failed to get terminal parameters: %m"); |
288a74cc RC |
263 | goto finish; |
264 | } | |
265 | ||
266 | /* We only reset the stuff that matters to the software. How | |
267 | * hardware is set up we don't touch assuming that somebody | |
268 | * else will do that for us */ | |
269 | ||
270 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
271 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
9fe26523 | 272 | termios.c_oflag |= ONLCR | OPOST; |
288a74cc RC |
273 | termios.c_cflag |= CREAD; |
274 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
275 | ||
276 | termios.c_cc[VINTR] = 03; /* ^C */ | |
277 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
278 | termios.c_cc[VERASE] = 0177; | |
279 | termios.c_cc[VKILL] = 025; /* ^X */ | |
280 | termios.c_cc[VEOF] = 04; /* ^D */ | |
281 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
282 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
283 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
284 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
285 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
286 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
287 | termios.c_cc[VEOL] = 0; | |
288 | termios.c_cc[VEOL2] = 0; | |
289 | ||
290 | termios.c_cc[VTIME] = 0; | |
291 | termios.c_cc[VMIN] = 1; | |
292 | ||
293 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
294 | r = -errno; | |
295 | ||
296 | finish: | |
297 | /* Just in case, flush all crap out */ | |
7d927c9a | 298 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
299 | |
300 | return r; | |
301 | } | |
302 | ||
303 | int reset_terminal(const char *name) { | |
254d1313 | 304 | _cleanup_close_ int fd = -EBADF; |
288a74cc | 305 | |
0a8b555c LP |
306 | /* We open the terminal with O_NONBLOCK here, to ensure we |
307 | * don't block on carrier if this is a terminal with carrier | |
308 | * configured. */ | |
309 | ||
310 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
311 | if (fd < 0) |
312 | return fd; | |
313 | ||
314 | return reset_terminal_fd(fd, true); | |
315 | } | |
316 | ||
317 | int open_terminal(const char *name, int mode) { | |
254d1313 | 318 | _cleanup_close_ int fd = -EBADF; |
288a74cc RC |
319 | unsigned c = 0; |
320 | ||
321 | /* | |
4768529f LP |
322 | * If a TTY is in the process of being closed opening it might cause EIO. This is horribly awful, but |
323 | * unlikely to be changed in the kernel. Hence we work around this problem by retrying a couple of | |
324 | * times. | |
288a74cc RC |
325 | * |
326 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
327 | */ | |
328 | ||
35bdab77 LP |
329 | if (mode & O_CREAT) |
330 | return -EINVAL; | |
288a74cc RC |
331 | |
332 | for (;;) { | |
333 | fd = open(name, mode, 0); | |
334 | if (fd >= 0) | |
335 | break; | |
336 | ||
337 | if (errno != EIO) | |
338 | return -errno; | |
339 | ||
340 | /* Max 1s in total */ | |
341 | if (c >= 20) | |
342 | return -errno; | |
343 | ||
4768529f | 344 | (void) usleep(50 * USEC_PER_MSEC); |
288a74cc RC |
345 | c++; |
346 | } | |
347 | ||
4768529f LP |
348 | if (isatty(fd) < 1) |
349 | return negative_errno(); | |
288a74cc | 350 | |
4768529f | 351 | return TAKE_FD(fd); |
288a74cc RC |
352 | } |
353 | ||
354 | int acquire_terminal( | |
355 | const char *name, | |
8854d795 | 356 | AcquireTerminalFlags flags, |
288a74cc RC |
357 | usec_t timeout) { |
358 | ||
254d1313 | 359 | _cleanup_close_ int notify = -EBADF, fd = -EBADF; |
8854d795 LP |
360 | usec_t ts = USEC_INFINITY; |
361 | int r, wd = -1; | |
288a74cc RC |
362 | |
363 | assert(name); | |
8854d795 | 364 | assert(IN_SET(flags & ~ACQUIRE_TERMINAL_PERMISSIVE, ACQUIRE_TERMINAL_TRY, ACQUIRE_TERMINAL_FORCE, ACQUIRE_TERMINAL_WAIT)); |
288a74cc | 365 | |
8854d795 LP |
366 | /* We use inotify to be notified when the tty is closed. We create the watch before checking if we can actually |
367 | * acquire it, so that we don't lose any event. | |
288a74cc | 368 | * |
8854d795 LP |
369 | * Note: strictly speaking this actually watches for the device being closed, it does *not* really watch |
370 | * whether a tty loses its controlling process. However, unless some rogue process uses TIOCNOTTY on /dev/tty | |
f95dbcc2 ZJS |
371 | * *after* closing its tty otherwise this will not become a problem. As long as the administrator makes sure to |
372 | * not configure any service on the same tty as an untrusted user this should not be a problem. (Which they | |
8854d795 LP |
373 | * probably should not do anyway.) */ |
374 | ||
375 | if ((flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_WAIT) { | |
288a74cc | 376 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); |
8854d795 LP |
377 | if (notify < 0) |
378 | return -errno; | |
288a74cc RC |
379 | |
380 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
8854d795 LP |
381 | if (wd < 0) |
382 | return -errno; | |
383 | ||
384 | if (timeout != USEC_INFINITY) | |
385 | ts = now(CLOCK_MONOTONIC); | |
288a74cc RC |
386 | } |
387 | ||
388 | for (;;) { | |
389 | struct sigaction sa_old, sa_new = { | |
390 | .sa_handler = SIG_IGN, | |
391 | .sa_flags = SA_RESTART, | |
392 | }; | |
393 | ||
394 | if (notify >= 0) { | |
395 | r = flush_fd(notify); | |
396 | if (r < 0) | |
8854d795 | 397 | return r; |
288a74cc RC |
398 | } |
399 | ||
8854d795 LP |
400 | /* We pass here O_NOCTTY only so that we can check the return value TIOCSCTTY and have a reliable way |
401 | * to figure out if we successfully became the controlling process of the tty */ | |
288a74cc RC |
402 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); |
403 | if (fd < 0) | |
404 | return fd; | |
405 | ||
8854d795 | 406 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed if we already own the tty. */ |
288a74cc RC |
407 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); |
408 | ||
409 | /* First, try to get the tty */ | |
7c248223 | 410 | r = RET_NERRNO(ioctl(fd, TIOCSCTTY, (flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_FORCE)); |
288a74cc | 411 | |
8854d795 | 412 | /* Reset signal handler to old value */ |
288a74cc RC |
413 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); |
414 | ||
8854d795 LP |
415 | /* Success? Exit the loop now! */ |
416 | if (r >= 0) | |
417 | break; | |
288a74cc | 418 | |
8854d795 LP |
419 | /* Any failure besides -EPERM? Fail, regardless of the mode. */ |
420 | if (r != -EPERM) | |
421 | return r; | |
288a74cc | 422 | |
8854d795 LP |
423 | if (flags & ACQUIRE_TERMINAL_PERMISSIVE) /* If we are in permissive mode, then EPERM is fine, turn this |
424 | * into a success. Note that EPERM is also returned if we | |
425 | * already are the owner of the TTY. */ | |
288a74cc RC |
426 | break; |
427 | ||
8854d795 LP |
428 | if (flags != ACQUIRE_TERMINAL_WAIT) /* If we are in TRY or FORCE mode, then propagate EPERM as EPERM */ |
429 | return r; | |
430 | ||
288a74cc | 431 | assert(notify >= 0); |
8854d795 | 432 | assert(wd >= 0); |
288a74cc RC |
433 | |
434 | for (;;) { | |
435 | union inotify_event_buffer buffer; | |
288a74cc RC |
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) { | |
8add30a0 | 456 | if (ERRNO_IS_TRANSIENT(errno)) |
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 | ||
254d1313 | 487 | _cleanup_close_ int fd = -EBADF; |
288a74cc | 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 | ||
7c248223 | 499 | r = RET_NERRNO(ioctl(fd, TIOCNOTTY)); |
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); | |
7c248223 | 508 | return RET_NERRNO(ioctl(fd, TIOCVHANGUP)); |
288a74cc RC |
509 | } |
510 | ||
511 | int terminal_vhangup(const char *name) { | |
254d1313 | 512 | _cleanup_close_ int fd = -EBADF; |
288a74cc | 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 | 533 | if (tty_is_vc(name)) { |
254d1313 | 534 | _cleanup_close_ int fd = -EBADF; |
ba5d26cc ZJS |
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 | ||
ff25d338 | 627 | if (!ascii_isdigit(tty[3])) |
288a74cc RC |
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 | ||
14f594b9 LP |
781 | if (fd < 0) |
782 | return -EBADF; | |
783 | ||
288a74cc RC |
784 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) |
785 | return -errno; | |
786 | ||
787 | if (ws.ws_col <= 0) | |
788 | return -EIO; | |
789 | ||
790 | return ws.ws_col; | |
791 | } | |
792 | ||
793 | unsigned columns(void) { | |
794 | const char *e; | |
795 | int c; | |
796 | ||
c6063244 | 797 | if (cached_columns > 0) |
288a74cc RC |
798 | return cached_columns; |
799 | ||
800 | c = 0; | |
801 | e = getenv("COLUMNS"); | |
802 | if (e) | |
803 | (void) safe_atoi(e, &c); | |
804 | ||
d09a7135 | 805 | if (c <= 0 || c > USHRT_MAX) { |
288a74cc | 806 | c = fd_columns(STDOUT_FILENO); |
d09a7135 LP |
807 | if (c <= 0) |
808 | c = 80; | |
809 | } | |
288a74cc RC |
810 | |
811 | cached_columns = c; | |
812 | return cached_columns; | |
813 | } | |
814 | ||
815 | int fd_lines(int fd) { | |
816 | struct winsize ws = {}; | |
817 | ||
14f594b9 LP |
818 | if (fd < 0) |
819 | return -EBADF; | |
820 | ||
288a74cc RC |
821 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) |
822 | return -errno; | |
823 | ||
824 | if (ws.ws_row <= 0) | |
825 | return -EIO; | |
826 | ||
827 | return ws.ws_row; | |
828 | } | |
829 | ||
830 | unsigned lines(void) { | |
831 | const char *e; | |
832 | int l; | |
833 | ||
c6063244 | 834 | if (cached_lines > 0) |
288a74cc RC |
835 | return cached_lines; |
836 | ||
837 | l = 0; | |
838 | e = getenv("LINES"); | |
839 | if (e) | |
840 | (void) safe_atoi(e, &l); | |
841 | ||
d09a7135 | 842 | if (l <= 0 || l > USHRT_MAX) { |
288a74cc | 843 | l = fd_lines(STDOUT_FILENO); |
d09a7135 LP |
844 | if (l <= 0) |
845 | l = 24; | |
846 | } | |
288a74cc RC |
847 | |
848 | cached_lines = l; | |
849 | return cached_lines; | |
850 | } | |
851 | ||
51462135 DDM |
852 | int terminal_set_size_fd(int fd, const char *ident, unsigned rows, unsigned cols) { |
853 | struct winsize ws; | |
854 | ||
855 | if (rows == UINT_MAX && cols == UINT_MAX) | |
856 | return 0; | |
857 | ||
858 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) | |
859 | return log_debug_errno(errno, | |
860 | "TIOCGWINSZ ioctl for getting %s size failed, not setting terminal size: %m", | |
861 | ident ?: "TTY"); | |
862 | ||
863 | if (rows == UINT_MAX) | |
864 | rows = ws.ws_row; | |
865 | else if (rows > USHRT_MAX) | |
866 | rows = USHRT_MAX; | |
867 | ||
868 | if (cols == UINT_MAX) | |
869 | cols = ws.ws_col; | |
870 | else if (cols > USHRT_MAX) | |
871 | cols = USHRT_MAX; | |
872 | ||
873 | if (rows == ws.ws_row && cols == ws.ws_col) | |
874 | return 0; | |
875 | ||
876 | ws.ws_row = rows; | |
877 | ws.ws_col = cols; | |
878 | ||
879 | if (ioctl(fd, TIOCSWINSZ, &ws) < 0) | |
880 | return log_debug_errno(errno, "TIOCSWINSZ ioctl for setting %s size failed: %m", ident ?: "TTY"); | |
881 | ||
882 | return 0; | |
883 | } | |
884 | ||
288a74cc RC |
885 | /* intended to be used as a SIGWINCH sighandler */ |
886 | void columns_lines_cache_reset(int signum) { | |
887 | cached_columns = 0; | |
888 | cached_lines = 0; | |
889 | } | |
890 | ||
c6063244 LP |
891 | void reset_terminal_feature_caches(void) { |
892 | cached_columns = 0; | |
893 | cached_lines = 0; | |
894 | ||
c4fea19a | 895 | cached_color_mode = _COLOR_INVALID; |
c6063244 LP |
896 | cached_underline_enabled = -1; |
897 | cached_on_tty = -1; | |
197dd3a9 | 898 | cached_on_dev_null = -1; |
c6063244 | 899 | } |
288a74cc | 900 | |
c6063244 | 901 | bool on_tty(void) { |
8cd0356e LP |
902 | |
903 | /* We check both stdout and stderr, so that situations where pipes on the shell are used are reliably | |
904 | * recognized, regardless if only the output or the errors are piped to some place. Since on_tty() is generally | |
905 | * used to default to a safer, non-interactive, non-color mode of operation it's probably good to be defensive | |
906 | * here, and check for both. Note that we don't check for STDIN_FILENO, because it should fine to use fancy | |
907 | * terminal functionality when outputting stuff, even if the input is piped to us. */ | |
908 | ||
c6063244 | 909 | if (cached_on_tty < 0) |
8cd0356e LP |
910 | cached_on_tty = |
911 | isatty(STDOUT_FILENO) > 0 && | |
912 | isatty(STDERR_FILENO) > 0; | |
288a74cc RC |
913 | |
914 | return cached_on_tty; | |
915 | } | |
916 | ||
288a74cc | 917 | int getttyname_malloc(int fd, char **ret) { |
30222f4b | 918 | char path[PATH_MAX], *c; /* PATH_MAX is counted *with* the trailing NUL byte */ |
288a74cc RC |
919 | int r; |
920 | ||
921 | assert(fd >= 0); | |
922 | assert(ret); | |
923 | ||
30222f4b ZJS |
924 | r = ttyname_r(fd, path, sizeof path); /* positive error */ |
925 | assert(r >= 0); | |
926 | if (r == ERANGE) | |
927 | return -ENAMETOOLONG; | |
928 | if (r > 0) | |
929 | return -r; | |
288a74cc | 930 | |
30222f4b ZJS |
931 | c = strdup(skip_dev_prefix(path)); |
932 | if (!c) | |
933 | return -ENOMEM; | |
288a74cc | 934 | |
30222f4b | 935 | *ret = c; |
288a74cc RC |
936 | return 0; |
937 | } | |
938 | ||
f171decd LP |
939 | int getttyname_harder(int fd, char **ret) { |
940 | _cleanup_free_ char *s = NULL; | |
941 | int r; | |
288a74cc | 942 | |
f171decd LP |
943 | r = getttyname_malloc(fd, &s); |
944 | if (r < 0) | |
945 | return r; | |
288a74cc | 946 | |
f171decd LP |
947 | if (streq(s, "tty")) |
948 | return get_ctty(0, NULL, ret); | |
288a74cc | 949 | |
f171decd | 950 | *ret = TAKE_PTR(s); |
288a74cc RC |
951 | return 0; |
952 | } | |
953 | ||
954 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
955 | int r; | |
956 | _cleanup_free_ char *line = NULL; | |
957 | const char *p; | |
958 | unsigned long ttynr; | |
959 | ||
960 | assert(pid >= 0); | |
961 | ||
962 | p = procfs_file_alloca(pid, "stat"); | |
963 | r = read_one_line_file(p, &line); | |
964 | if (r < 0) | |
965 | return r; | |
966 | ||
967 | p = strrchr(line, ')'); | |
968 | if (!p) | |
969 | return -EIO; | |
970 | ||
971 | p++; | |
972 | ||
973 | if (sscanf(p, " " | |
974 | "%*c " /* state */ | |
975 | "%*d " /* ppid */ | |
976 | "%*d " /* pgrp */ | |
977 | "%*d " /* session */ | |
978 | "%lu ", /* ttynr */ | |
979 | &ttynr) != 1) | |
980 | return -EIO; | |
981 | ||
d80e2a1e | 982 | if (devnum_is_zero(ttynr)) |
cfeaa44a | 983 | return -ENXIO; |
288a74cc RC |
984 | |
985 | if (d) | |
986 | *d = (dev_t) ttynr; | |
987 | ||
988 | return 0; | |
989 | } | |
990 | ||
54b22b26 | 991 | int get_ctty(pid_t pid, dev_t *ret_devnr, char **ret) { |
11f3c130 LP |
992 | char pty[STRLEN("/dev/pts/") + DECIMAL_STR_MAX(dev_t) + 1]; |
993 | _cleanup_free_ char *buf = NULL; | |
994 | const char *fn = NULL, *w; | |
288a74cc | 995 | dev_t devnr; |
54b22b26 | 996 | int r; |
288a74cc | 997 | |
54b22b26 LP |
998 | r = get_ctty_devnr(pid, &devnr); |
999 | if (r < 0) | |
1000 | return r; | |
288a74cc | 1001 | |
11f3c130 | 1002 | r = device_path_make_canonical(S_IFCHR, devnr, &buf); |
54b22b26 | 1003 | if (r < 0) { |
11f3c130 LP |
1004 | struct stat st; |
1005 | ||
54b22b26 LP |
1006 | if (r != -ENOENT) /* No symlink for this in /dev/char/? */ |
1007 | return r; | |
288a74cc | 1008 | |
11f3c130 LP |
1009 | /* Maybe this is PTY? PTY devices are not listed in /dev/char/, as they don't follow the |
1010 | * Linux device model and hence device_path_make_canonical() doesn't work for them. Let's | |
1011 | * assume this is a PTY for a moment, and check if the device node this would then map to in | |
1012 | * /dev/pts/ matches the one we are looking for. This way we don't have to hardcode the major | |
1013 | * number (which is 136 btw), but we still rely on the fact that PTY numbers map directly to | |
1014 | * the minor number of the pty. */ | |
1015 | xsprintf(pty, "/dev/pts/%u", minor(devnr)); | |
1016 | ||
1017 | if (stat(pty, &st) < 0) { | |
1018 | if (errno != ENOENT) | |
1019 | return -errno; | |
54b22b26 | 1020 | |
11f3c130 LP |
1021 | } else if (S_ISCHR(st.st_mode) && devnr == st.st_rdev) /* Bingo! */ |
1022 | fn = pty; | |
288a74cc | 1023 | |
11f3c130 LP |
1024 | if (!fn) { |
1025 | /* Doesn't exist, or not a PTY? Probably something similar to the PTYs which have no | |
1026 | * symlink in /dev/char/. Let's return something vaguely useful. */ | |
1027 | r = device_path_make_major_minor(S_IFCHR, devnr, &buf); | |
54b22b26 LP |
1028 | if (r < 0) |
1029 | return r; | |
11f3c130 LP |
1030 | |
1031 | fn = buf; | |
288a74cc | 1032 | } |
11f3c130 LP |
1033 | } else |
1034 | fn = buf; | |
288a74cc | 1035 | |
11f3c130 LP |
1036 | w = path_startswith(fn, "/dev/"); |
1037 | if (!w) | |
1038 | return -EINVAL; | |
54b22b26 | 1039 | |
11f3c130 LP |
1040 | if (ret) { |
1041 | _cleanup_free_ char *b = NULL; | |
1042 | ||
1043 | b = strdup(w); | |
1044 | if (!b) | |
1045 | return -ENOMEM; | |
288a74cc | 1046 | |
54b22b26 | 1047 | *ret = TAKE_PTR(b); |
11f3c130 | 1048 | } |
54b22b26 LP |
1049 | |
1050 | if (ret_devnr) | |
1051 | *ret_devnr = devnr; | |
288a74cc RC |
1052 | |
1053 | return 0; | |
1054 | } | |
a07c35c3 | 1055 | |
66cb2fde LP |
1056 | int ptsname_malloc(int fd, char **ret) { |
1057 | size_t l = 100; | |
1058 | ||
1059 | assert(fd >= 0); | |
1060 | assert(ret); | |
1061 | ||
1062 | for (;;) { | |
1063 | char *c; | |
1064 | ||
1065 | c = new(char, l); | |
1066 | if (!c) | |
1067 | return -ENOMEM; | |
1068 | ||
1069 | if (ptsname_r(fd, c, l) == 0) { | |
1070 | *ret = c; | |
1071 | return 0; | |
1072 | } | |
1073 | if (errno != ERANGE) { | |
1074 | free(c); | |
1075 | return -errno; | |
1076 | } | |
1077 | ||
1078 | free(c); | |
1fd4c4ed LP |
1079 | |
1080 | if (l > SIZE_MAX / 2) | |
1081 | return -ENOMEM; | |
1082 | ||
66cb2fde LP |
1083 | l *= 2; |
1084 | } | |
1085 | } | |
1086 | ||
ae1d13db | 1087 | int openpt_allocate(int flags, char **ret_slave) { |
254d1313 | 1088 | _cleanup_close_ int fd = -EBADF; |
ae1d13db FB |
1089 | _cleanup_free_ char *p = NULL; |
1090 | int r; | |
1091 | ||
1092 | fd = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); | |
1093 | if (fd < 0) | |
1094 | return -errno; | |
1095 | ||
1096 | if (ret_slave) { | |
1097 | r = ptsname_malloc(fd, &p); | |
1098 | if (r < 0) | |
1099 | return r; | |
1100 | ||
1101 | if (!path_startswith(p, "/dev/pts/")) | |
1102 | return -EINVAL; | |
1103 | } | |
1104 | ||
1105 | if (unlockpt(fd) < 0) | |
1106 | return -errno; | |
1107 | ||
1108 | if (ret_slave) | |
1109 | *ret_slave = TAKE_PTR(p); | |
1110 | ||
1111 | return TAKE_FD(fd); | |
1112 | } | |
1113 | ||
1114 | static int ptsname_namespace(int pty, char **ret) { | |
a07c35c3 LP |
1115 | int no = -1, r; |
1116 | ||
1117 | /* Like ptsname(), but doesn't assume that the path is | |
1118 | * accessible in the local namespace. */ | |
1119 | ||
1120 | r = ioctl(pty, TIOCGPTN, &no); | |
1121 | if (r < 0) | |
1122 | return -errno; | |
1123 | ||
1124 | if (no < 0) | |
1125 | return -EIO; | |
1126 | ||
1127 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1128 | return -ENOMEM; | |
1129 | ||
1130 | return 0; | |
1131 | } | |
66cb2fde | 1132 | |
ae1d13db | 1133 | int openpt_allocate_in_namespace(pid_t pid, int flags, char **ret_slave) { |
254d1313 | 1134 | _cleanup_close_ int pidnsfd = -EBADF, mntnsfd = -EBADF, usernsfd = -EBADF, rootfd = -EBADF, fd = -EBADF; |
19ee48a6 | 1135 | _cleanup_close_pair_ int pair[2] = PIPE_EBADF; |
66cb2fde LP |
1136 | pid_t child; |
1137 | int r; | |
1138 | ||
1139 | assert(pid > 0); | |
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-openptns)", "(sd-openpt)", 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) { | |
66cb2fde LP |
1153 | pair[0] = safe_close(pair[0]); |
1154 | ||
ae1d13db FB |
1155 | fd = openpt_allocate(flags, NULL); |
1156 | if (fd < 0) | |
66cb2fde LP |
1157 | _exit(EXIT_FAILURE); |
1158 | ||
ae1d13db | 1159 | if (send_one_fd(pair[1], fd, 0) < 0) |
66cb2fde LP |
1160 | _exit(EXIT_FAILURE); |
1161 | ||
1162 | _exit(EXIT_SUCCESS); | |
1163 | } | |
1164 | ||
1165 | pair[1] = safe_close(pair[1]); | |
1166 | ||
1edcb6a9 | 1167 | r = wait_for_terminate_and_check("(sd-openptns)", child, 0); |
66cb2fde LP |
1168 | if (r < 0) |
1169 | return r; | |
2e87a1fd | 1170 | if (r != EXIT_SUCCESS) |
66cb2fde LP |
1171 | return -EIO; |
1172 | ||
ae1d13db FB |
1173 | fd = receive_one_fd(pair[0], 0); |
1174 | if (fd < 0) | |
1175 | return fd; | |
1176 | ||
1177 | if (ret_slave) { | |
1178 | r = ptsname_namespace(fd, ret_slave); | |
1179 | if (r < 0) | |
1180 | return r; | |
1181 | } | |
1182 | ||
1183 | return TAKE_FD(fd); | |
66cb2fde | 1184 | } |
40e1f4ea LP |
1185 | |
1186 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
254d1313 | 1187 | _cleanup_close_ int pidnsfd = -EBADF, mntnsfd = -EBADF, usernsfd = -EBADF, rootfd = -EBADF; |
19ee48a6 | 1188 | _cleanup_close_pair_ int pair[2] = PIPE_EBADF; |
40e1f4ea LP |
1189 | pid_t child; |
1190 | int r; | |
1191 | ||
1192 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1193 | if (r < 0) | |
1194 | return r; | |
1195 | ||
1196 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1197 | return -errno; | |
1198 | ||
1edcb6a9 LP |
1199 | r = namespace_fork("(sd-terminalns)", "(sd-terminal)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG, |
1200 | pidnsfd, mntnsfd, -1, usernsfd, rootfd, &child); | |
4c253ed1 LP |
1201 | if (r < 0) |
1202 | return r; | |
1203 | if (r == 0) { | |
40e1f4ea LP |
1204 | int master; |
1205 | ||
1206 | pair[0] = safe_close(pair[0]); | |
1207 | ||
40e1f4ea LP |
1208 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); |
1209 | if (master < 0) | |
1210 | _exit(EXIT_FAILURE); | |
1211 | ||
1212 | if (send_one_fd(pair[1], master, 0) < 0) | |
1213 | _exit(EXIT_FAILURE); | |
1214 | ||
1215 | _exit(EXIT_SUCCESS); | |
1216 | } | |
1217 | ||
1218 | pair[1] = safe_close(pair[1]); | |
1219 | ||
1edcb6a9 | 1220 | r = wait_for_terminate_and_check("(sd-terminalns)", child, 0); |
40e1f4ea LP |
1221 | if (r < 0) |
1222 | return r; | |
2e87a1fd | 1223 | if (r != EXIT_SUCCESS) |
40e1f4ea LP |
1224 | return -EIO; |
1225 | ||
1226 | return receive_one_fd(pair[0], 0); | |
1227 | } | |
40c9fe4c | 1228 | |
197dd3a9 DDM |
1229 | static bool on_dev_null(void) { |
1230 | struct stat dst, ost, est; | |
1231 | ||
1232 | if (cached_on_dev_null >= 0) | |
1233 | return cached_on_dev_null; | |
1234 | ||
1235 | if (stat("/dev/null", &dst) < 0 || fstat(STDOUT_FILENO, &ost) < 0 || fstat(STDERR_FILENO, &est) < 0) | |
1236 | cached_on_dev_null = false; | |
1237 | else | |
1238 | cached_on_dev_null = stat_inode_same(&dst, &ost) && stat_inode_same(&dst, &est); | |
1239 | ||
1240 | return cached_on_dev_null; | |
1241 | } | |
1242 | ||
158fbf76 | 1243 | static bool getenv_terminal_is_dumb(void) { |
ac96418b LP |
1244 | const char *e; |
1245 | ||
ac96418b LP |
1246 | e = getenv("TERM"); |
1247 | if (!e) | |
1248 | return true; | |
1249 | ||
1250 | return streq(e, "dumb"); | |
1251 | } | |
1252 | ||
158fbf76 | 1253 | bool terminal_is_dumb(void) { |
197dd3a9 | 1254 | if (!on_tty() && !on_dev_null()) |
158fbf76 ZJS |
1255 | return true; |
1256 | ||
1257 | return getenv_terminal_is_dumb(); | |
1258 | } | |
1259 | ||
c4fea19a MGR |
1260 | static ColorMode parse_systemd_colors(void) { |
1261 | const char *e; | |
1262 | int r; | |
ae5b3958 | 1263 | |
c4fea19a MGR |
1264 | e = getenv("SYSTEMD_COLORS"); |
1265 | if (!e) | |
1266 | return _COLOR_INVALID; | |
1267 | if (streq(e, "16")) | |
1268 | return COLOR_16; | |
1269 | if (streq(e, "256")) | |
1270 | return COLOR_256; | |
1271 | r = parse_boolean(e); | |
1272 | if (r >= 0) | |
1273 | return r > 0 ? COLOR_ON : COLOR_OFF; | |
1274 | return _COLOR_INVALID; | |
1275 | } | |
c484315b | 1276 | |
c4fea19a MGR |
1277 | ColorMode get_color_mode(void) { |
1278 | ||
1279 | /* Returns the mode used to choose output colors. The possible modes are COLOR_OFF for no colors, | |
1280 | * COLOR_16 for only the base 16 ANSI colors, COLOR_256 for more colors and COLOR_ON for unrestricted | |
1281 | * color output. For that we check $SYSTEMD_COLORS first (which is the explicit way to | |
1282 | * 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 | |
1283 | * 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 | |
1284 | * check whether we are connected to a TTY, because we don't keep /dev/console open continuously due to fear | |
1285 | * of SAK, and hence things are a bit weird. */ | |
1286 | ColorMode m; | |
1287 | ||
1288 | if (cached_color_mode < 0) { | |
1289 | m = parse_systemd_colors(); | |
1290 | if (m >= 0) | |
1291 | cached_color_mode = m; | |
c484315b ZJS |
1292 | else if (getenv("NO_COLOR")) |
1293 | /* We only check for the presence of the variable; value is ignored. */ | |
c4fea19a | 1294 | cached_color_mode = COLOR_OFF; |
c484315b | 1295 | |
34c2d32c | 1296 | else if (getpid_cached() == 1) { |
c4fea19a | 1297 | /* PID1 outputs to the console without holding it open all the time. |
ddbf9605 LP |
1298 | * |
1299 | * Note that the Linux console can only display 16 colors. We still enable 256 color | |
1300 | * mode even for PID1 output though (which typically goes to the Linux console), | |
1301 | * since the Linux console is able to parse the 256 color sequences and automatically | |
1302 | * map them to the closest color in the 16 color palette (since kernel 3.16). Doing | |
1303 | * 256 colors is nice for people who invoke systemd in a container or via a serial | |
1304 | * link or such, and use a true 256 color terminal to do so. */ | |
34c2d32c ZJS |
1305 | if (getenv_terminal_is_dumb()) |
1306 | cached_color_mode = COLOR_OFF; | |
1307 | } else { | |
1308 | if (terminal_is_dumb()) | |
1309 | cached_color_mode = COLOR_OFF; | |
1310 | } | |
1311 | ||
1312 | if (cached_color_mode < 0) { | |
1313 | /* We failed to figure out any reason to *disable* colors. | |
1314 | * Let's see how many colors we shall use. */ | |
1315 | if (STRPTR_IN_SET(getenv("COLORTERM"), | |
1316 | "truecolor", | |
1317 | "24bit")) | |
1318 | cached_color_mode = COLOR_24BIT; | |
1319 | else | |
1320 | cached_color_mode = COLOR_256; | |
1321 | } | |
40c9fe4c JS |
1322 | } |
1323 | ||
c4fea19a MGR |
1324 | return cached_color_mode; |
1325 | } | |
1326 | ||
c2b32159 LP |
1327 | bool dev_console_colors_enabled(void) { |
1328 | _cleanup_free_ char *s = NULL; | |
c4fea19a | 1329 | ColorMode m; |
c2b32159 LP |
1330 | |
1331 | /* Returns true if we assume that color is supported on /dev/console. | |
1332 | * | |
1333 | * For that we first check if we explicitly got told to use colors or not, by checking $SYSTEMD_COLORS. If that | |
f95dbcc2 ZJS |
1334 | * isn't set we check whether PID 1 has $TERM set, and if not, whether TERM is set on the kernel command |
1335 | * line. If we find $TERM set we assume color if it's not set to "dumb", similarly to how regular | |
c2b32159 LP |
1336 | * colors_enabled() operates. */ |
1337 | ||
c4fea19a MGR |
1338 | m = parse_systemd_colors(); |
1339 | if (m >= 0) | |
1340 | return m; | |
c2b32159 | 1341 | |
c484315b ZJS |
1342 | if (getenv("NO_COLOR")) |
1343 | return false; | |
1344 | ||
c2b32159 LP |
1345 | if (getenv_for_pid(1, "TERM", &s) <= 0) |
1346 | (void) proc_cmdline_get_key("TERM", 0, &s); | |
1347 | ||
1348 | return !streq_ptr(s, "dumb"); | |
1349 | } | |
1350 | ||
526664f6 | 1351 | bool underline_enabled(void) { |
526664f6 | 1352 | |
c6063244 | 1353 | if (cached_underline_enabled < 0) { |
526664f6 LP |
1354 | |
1355 | /* The Linux console doesn't support underlining, turn it off, but only there. */ | |
1356 | ||
c6063244 LP |
1357 | if (colors_enabled()) |
1358 | cached_underline_enabled = !streq_ptr(getenv("TERM"), "linux"); | |
526664f6 | 1359 | else |
c6063244 | 1360 | cached_underline_enabled = false; |
526664f6 LP |
1361 | } |
1362 | ||
c6063244 | 1363 | return cached_underline_enabled; |
526664f6 LP |
1364 | } |
1365 | ||
c83f349c LP |
1366 | int vt_default_utf8(void) { |
1367 | _cleanup_free_ char *b = NULL; | |
1368 | int r; | |
1369 | ||
1370 | /* Read the default VT UTF8 setting from the kernel */ | |
1371 | ||
1372 | r = read_one_line_file("/sys/module/vt/parameters/default_utf8", &b); | |
1373 | if (r < 0) | |
1374 | return r; | |
1375 | ||
1376 | return parse_boolean(b); | |
1377 | } | |
1378 | ||
1379 | int vt_reset_keyboard(int fd) { | |
15bba613 | 1380 | int kb; |
c83f349c LP |
1381 | |
1382 | /* If we can't read the default, then default to unicode. It's 2017 after all. */ | |
1383 | kb = vt_default_utf8() != 0 ? K_UNICODE : K_XLATE; | |
1384 | ||
7c248223 | 1385 | return RET_NERRNO(ioctl(fd, KDSKBMODE, kb)); |
c83f349c | 1386 | } |
6179ede1 FB |
1387 | |
1388 | int vt_restore(int fd) { | |
1389 | static const struct vt_mode mode = { | |
1390 | .mode = VT_AUTO, | |
1391 | }; | |
1392 | int r, q = 0; | |
1393 | ||
e60a4a3c LP |
1394 | if (isatty(fd) < 1) |
1395 | return log_debug_errno(errno, "Asked to restore the VT for an fd that does not refer to a terminal: %m"); | |
1396 | ||
1802d5f2 | 1397 | if (ioctl(fd, KDSETMODE, KD_TEXT) < 0) |
6179ede1 FB |
1398 | q = log_debug_errno(errno, "Failed to set VT in text mode, ignoring: %m"); |
1399 | ||
1400 | r = vt_reset_keyboard(fd); | |
1401 | if (r < 0) { | |
1402 | log_debug_errno(r, "Failed to reset keyboard mode, ignoring: %m"); | |
1403 | if (q >= 0) | |
1404 | q = r; | |
1405 | } | |
1406 | ||
1802d5f2 | 1407 | if (ioctl(fd, VT_SETMODE, &mode) < 0) { |
6179ede1 FB |
1408 | log_debug_errno(errno, "Failed to set VT_AUTO mode, ignoring: %m"); |
1409 | if (q >= 0) | |
1410 | q = -errno; | |
1411 | } | |
1412 | ||
f5fbe71d | 1413 | r = fchmod_and_chown(fd, TTY_MODE, 0, GID_INVALID); |
6179ede1 | 1414 | if (r < 0) { |
1802d5f2 | 1415 | log_debug_errno(r, "Failed to chmod()/chown() VT, ignoring: %m"); |
6179ede1 | 1416 | if (q >= 0) |
1802d5f2 | 1417 | q = r; |
6179ede1 FB |
1418 | } |
1419 | ||
1420 | return q; | |
1421 | } | |
27dafac9 FB |
1422 | |
1423 | int vt_release(int fd, bool restore) { | |
1424 | assert(fd >= 0); | |
1425 | ||
1426 | /* This function releases the VT by acknowledging the VT-switch signal | |
1427 | * sent by the kernel and optionally reset the VT in text and auto | |
1428 | * VT-switching modes. */ | |
1429 | ||
e60a4a3c LP |
1430 | if (isatty(fd) < 1) |
1431 | return log_debug_errno(errno, "Asked to release the VT for an fd that does not refer to a terminal: %m"); | |
1432 | ||
27dafac9 FB |
1433 | if (ioctl(fd, VT_RELDISP, 1) < 0) |
1434 | return -errno; | |
1435 | ||
1436 | if (restore) | |
1437 | return vt_restore(fd); | |
1438 | ||
1439 | return 0; | |
1440 | } | |
37b8d2f6 ZJS |
1441 | |
1442 | void get_log_colors(int priority, const char **on, const char **off, const char **highlight) { | |
1443 | /* Note that this will initialize output variables only when there's something to output. | |
5e2b0e1c | 1444 | * The caller must pre-initialize to "" or NULL as appropriate. */ |
37b8d2f6 ZJS |
1445 | |
1446 | if (priority <= LOG_ERR) { | |
1447 | if (on) | |
25e4608b | 1448 | *on = ansi_highlight_red(); |
37b8d2f6 | 1449 | if (off) |
bb146d23 | 1450 | *off = ansi_normal(); |
37b8d2f6 | 1451 | if (highlight) |
bb146d23 | 1452 | *highlight = ansi_highlight(); |
37b8d2f6 | 1453 | |
0d0464d3 ZJS |
1454 | } else if (priority <= LOG_WARNING) { |
1455 | if (on) | |
25e4608b | 1456 | *on = ansi_highlight_yellow(); |
0d0464d3 | 1457 | if (off) |
bb146d23 | 1458 | *off = ansi_normal(); |
0d0464d3 | 1459 | if (highlight) |
bb146d23 | 1460 | *highlight = ansi_highlight(); |
0d0464d3 | 1461 | |
37b8d2f6 ZJS |
1462 | } else if (priority <= LOG_NOTICE) { |
1463 | if (on) | |
bb146d23 | 1464 | *on = ansi_highlight(); |
37b8d2f6 | 1465 | if (off) |
bb146d23 | 1466 | *off = ansi_normal(); |
37b8d2f6 | 1467 | if (highlight) |
25e4608b | 1468 | *highlight = ansi_highlight_red(); |
37b8d2f6 ZJS |
1469 | |
1470 | } else if (priority >= LOG_DEBUG) { | |
1471 | if (on) | |
25e4608b | 1472 | *on = ansi_grey(); |
37b8d2f6 | 1473 | if (off) |
bb146d23 | 1474 | *off = ansi_normal(); |
37b8d2f6 | 1475 | if (highlight) |
25e4608b | 1476 | *highlight = ansi_highlight_red(); |
37b8d2f6 ZJS |
1477 | } |
1478 | } |