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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" |
f8360f33 | 24 | #include "def.h" |
acf553b0 | 25 | #include "env-util.h" |
3ffd4af2 | 26 | #include "fd-util.h" |
288a74cc | 27 | #include "fileio.h" |
f4f15635 | 28 | #include "fs-util.h" |
9e5fd717 | 29 | #include "inotify-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" |
11f3c130 | 40 | #include "stdio-util.h" |
07630cea | 41 | #include "string-util.h" |
6af62124 | 42 | #include "strv.h" |
3ffd4af2 | 43 | #include "terminal-util.h" |
07630cea | 44 | #include "time-util.h" |
f5fbe71d | 45 | #include "user-util.h" |
07630cea | 46 | #include "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; |
c4fea19a | 52 | static volatile int cached_color_mode = _COLOR_INVALID; |
c6063244 LP |
53 | static volatile int cached_underline_enabled = -1; |
54 | ||
288a74cc | 55 | int chvt(int vt) { |
c2b2df60 | 56 | _cleanup_close_ int fd = -1; |
288a74cc | 57 | |
0295642d LP |
58 | /* Switch to the specified vt number. If the VT is specified <= 0 switch to the VT the kernel log messages go, |
59 | * if that's configured. */ | |
60 | ||
0a8b555c | 61 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
62 | if (fd < 0) |
63 | return -errno; | |
64 | ||
b9e74c39 | 65 | if (vt <= 0) { |
288a74cc RC |
66 | int tiocl[2] = { |
67 | TIOCL_GETKMSGREDIRECT, | |
68 | 0 | |
69 | }; | |
70 | ||
71 | if (ioctl(fd, TIOCLINUX, tiocl) < 0) | |
72 | return -errno; | |
73 | ||
74 | vt = tiocl[0] <= 0 ? 1 : tiocl[0]; | |
75 | } | |
76 | ||
77 | if (ioctl(fd, VT_ACTIVATE, vt) < 0) | |
78 | return -errno; | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) { | |
715bcf36 LP |
84 | _cleanup_free_ char *line = NULL; |
85 | struct termios old_termios; | |
14f594b9 | 86 | int r, fd; |
288a74cc RC |
87 | |
88 | assert(f); | |
89 | assert(ret); | |
90 | ||
14f594b9 LP |
91 | /* If this is a terminal, then switch canonical mode off, so that we can read a single |
92 | * character. (Note that fmemopen() streams do not have an fd associated with them, let's handle that | |
93 | * nicely.) */ | |
94 | fd = fileno(f); | |
95 | if (fd >= 0 && tcgetattr(fd, &old_termios) >= 0) { | |
715bcf36 | 96 | struct termios new_termios = old_termios; |
288a74cc RC |
97 | |
98 | new_termios.c_lflag &= ~ICANON; | |
99 | new_termios.c_cc[VMIN] = 1; | |
100 | new_termios.c_cc[VTIME] = 0; | |
101 | ||
14f594b9 | 102 | if (tcsetattr(fd, TCSADRAIN, &new_termios) >= 0) { |
03a7dbea | 103 | char c; |
288a74cc RC |
104 | |
105 | if (t != USEC_INFINITY) { | |
14f594b9 LP |
106 | if (fd_wait_for_event(fd, POLLIN, t) <= 0) { |
107 | (void) tcsetattr(fd, TCSADRAIN, &old_termios); | |
288a74cc RC |
108 | return -ETIMEDOUT; |
109 | } | |
110 | } | |
111 | ||
03a7dbea | 112 | r = safe_fgetc(f, &c); |
14f594b9 | 113 | (void) tcsetattr(fd, TCSADRAIN, &old_termios); |
d3f9790c LP |
114 | if (r < 0) |
115 | return r; | |
03a7dbea LP |
116 | if (r == 0) |
117 | return -EIO; | |
288a74cc RC |
118 | |
119 | if (need_nl) | |
120 | *need_nl = c != '\n'; | |
121 | ||
122 | *ret = c; | |
123 | return 0; | |
124 | } | |
125 | } | |
126 | ||
14f594b9 LP |
127 | if (t != USEC_INFINITY && fd > 0) { |
128 | /* Let's wait the specified amount of time for input. When we have no fd we skip this, under | |
129 | * the assumption that this is an fmemopen() stream or so where waiting doesn't make sense | |
130 | * anyway, as the data is either already in the stream or cannot possible be placed there | |
131 | * while we access the stream */ | |
132 | ||
133 | if (fd_wait_for_event(fd, POLLIN, t) <= 0) | |
288a74cc RC |
134 | return -ETIMEDOUT; |
135 | } | |
136 | ||
715bcf36 | 137 | /* If this is not a terminal, then read a full line instead */ |
288a74cc | 138 | |
715bcf36 LP |
139 | r = read_line(f, 16, &line); /* longer than necessary, to eat up UTF-8 chars/vt100 key sequences */ |
140 | if (r < 0) | |
141 | return r; | |
142 | if (r == 0) | |
143 | return -EIO; | |
288a74cc RC |
144 | |
145 | if (strlen(line) != 1) | |
146 | return -EBADMSG; | |
147 | ||
148 | if (need_nl) | |
149 | *need_nl = false; | |
150 | ||
151 | *ret = line[0]; | |
152 | return 0; | |
153 | } | |
154 | ||
3c670f89 FB |
155 | #define DEFAULT_ASK_REFRESH_USEC (2*USEC_PER_SEC) |
156 | ||
157 | int ask_char(char *ret, const char *replies, const char *fmt, ...) { | |
288a74cc RC |
158 | int r; |
159 | ||
160 | assert(ret); | |
161 | assert(replies); | |
3c670f89 | 162 | assert(fmt); |
288a74cc RC |
163 | |
164 | for (;;) { | |
165 | va_list ap; | |
166 | char c; | |
167 | bool need_nl = true; | |
168 | ||
25e4608b | 169 | fputs(ansi_highlight(), stdout); |
288a74cc | 170 | |
3c670f89 FB |
171 | putchar('\r'); |
172 | ||
173 | va_start(ap, fmt); | |
174 | vprintf(fmt, ap); | |
288a74cc RC |
175 | va_end(ap); |
176 | ||
25e4608b | 177 | fputs(ansi_normal(), stdout); |
288a74cc RC |
178 | |
179 | fflush(stdout); | |
180 | ||
3c670f89 | 181 | r = read_one_char(stdin, &c, DEFAULT_ASK_REFRESH_USEC, &need_nl); |
288a74cc RC |
182 | if (r < 0) { |
183 | ||
3c670f89 FB |
184 | if (r == -ETIMEDOUT) |
185 | continue; | |
186 | ||
288a74cc RC |
187 | if (r == -EBADMSG) { |
188 | puts("Bad input, please try again."); | |
189 | continue; | |
190 | } | |
191 | ||
192 | putchar('\n'); | |
193 | return r; | |
194 | } | |
195 | ||
196 | if (need_nl) | |
197 | putchar('\n'); | |
198 | ||
199 | if (strchr(replies, c)) { | |
200 | *ret = c; | |
201 | return 0; | |
202 | } | |
203 | ||
204 | puts("Read unexpected character, please try again."); | |
205 | } | |
206 | } | |
207 | ||
208 | int ask_string(char **ret, const char *text, ...) { | |
03d94294 ZJS |
209 | _cleanup_free_ char *line = NULL; |
210 | va_list ap; | |
715bcf36 LP |
211 | int r; |
212 | ||
288a74cc RC |
213 | assert(ret); |
214 | assert(text); | |
215 | ||
25e4608b | 216 | fputs(ansi_highlight(), stdout); |
288a74cc | 217 | |
03d94294 ZJS |
218 | va_start(ap, text); |
219 | vprintf(text, ap); | |
220 | va_end(ap); | |
288a74cc | 221 | |
25e4608b | 222 | fputs(ansi_normal(), stdout); |
288a74cc | 223 | |
03d94294 | 224 | fflush(stdout); |
288a74cc | 225 | |
03d94294 ZJS |
226 | r = read_line(stdin, LONG_LINE_MAX, &line); |
227 | if (r < 0) | |
228 | return r; | |
229 | if (r == 0) | |
230 | return -EIO; | |
288a74cc | 231 | |
03d94294 ZJS |
232 | *ret = TAKE_PTR(line); |
233 | return 0; | |
288a74cc RC |
234 | } |
235 | ||
236 | int reset_terminal_fd(int fd, bool switch_to_text) { | |
237 | struct termios termios; | |
238 | int r = 0; | |
239 | ||
240 | /* Set terminal to some sane defaults */ | |
241 | ||
242 | assert(fd >= 0); | |
243 | ||
e60a4a3c LP |
244 | if (isatty(fd) < 1) |
245 | return log_debug_errno(errno, "Asked to reset a terminal that actually isn't a terminal: %m"); | |
246 | ||
247 | /* We leave locked terminal attributes untouched, so that Plymouth may set whatever it wants to set, | |
248 | * and we don't interfere with that. */ | |
288a74cc RC |
249 | |
250 | /* Disable exclusive mode, just in case */ | |
7eaee902 LP |
251 | if (ioctl(fd, TIOCNXCL) < 0) |
252 | log_debug_errno(errno, "TIOCNXCL ioctl failed on TTY, ignoring: %m"); | |
288a74cc RC |
253 | |
254 | /* Switch to text mode */ | |
255 | if (switch_to_text) | |
7eaee902 LP |
256 | if (ioctl(fd, KDSETMODE, KD_TEXT) < 0) |
257 | log_debug_errno(errno, "KDSETMODE ioctl for switching to text mode failed on TTY, ignoring: %m"); | |
258 | ||
288a74cc | 259 | |
73e669e0 | 260 | /* Set default keyboard mode */ |
c83f349c | 261 | (void) vt_reset_keyboard(fd); |
288a74cc RC |
262 | |
263 | if (tcgetattr(fd, &termios) < 0) { | |
7eaee902 | 264 | r = log_debug_errno(errno, "Failed to get terminal parameters: %m"); |
288a74cc RC |
265 | goto finish; |
266 | } | |
267 | ||
268 | /* We only reset the stuff that matters to the software. How | |
269 | * hardware is set up we don't touch assuming that somebody | |
270 | * else will do that for us */ | |
271 | ||
272 | termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC); | |
273 | termios.c_iflag |= ICRNL | IMAXBEL | IUTF8; | |
274 | termios.c_oflag |= ONLCR; | |
275 | termios.c_cflag |= CREAD; | |
276 | termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE; | |
277 | ||
278 | termios.c_cc[VINTR] = 03; /* ^C */ | |
279 | termios.c_cc[VQUIT] = 034; /* ^\ */ | |
280 | termios.c_cc[VERASE] = 0177; | |
281 | termios.c_cc[VKILL] = 025; /* ^X */ | |
282 | termios.c_cc[VEOF] = 04; /* ^D */ | |
283 | termios.c_cc[VSTART] = 021; /* ^Q */ | |
284 | termios.c_cc[VSTOP] = 023; /* ^S */ | |
285 | termios.c_cc[VSUSP] = 032; /* ^Z */ | |
286 | termios.c_cc[VLNEXT] = 026; /* ^V */ | |
287 | termios.c_cc[VWERASE] = 027; /* ^W */ | |
288 | termios.c_cc[VREPRINT] = 022; /* ^R */ | |
289 | termios.c_cc[VEOL] = 0; | |
290 | termios.c_cc[VEOL2] = 0; | |
291 | ||
292 | termios.c_cc[VTIME] = 0; | |
293 | termios.c_cc[VMIN] = 1; | |
294 | ||
295 | if (tcsetattr(fd, TCSANOW, &termios) < 0) | |
296 | r = -errno; | |
297 | ||
298 | finish: | |
299 | /* Just in case, flush all crap out */ | |
7d927c9a | 300 | (void) tcflush(fd, TCIOFLUSH); |
288a74cc RC |
301 | |
302 | return r; | |
303 | } | |
304 | ||
305 | int reset_terminal(const char *name) { | |
306 | _cleanup_close_ int fd = -1; | |
307 | ||
0a8b555c LP |
308 | /* We open the terminal with O_NONBLOCK here, to ensure we |
309 | * don't block on carrier if this is a terminal with carrier | |
310 | * configured. */ | |
311 | ||
312 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
288a74cc RC |
313 | if (fd < 0) |
314 | return fd; | |
315 | ||
316 | return reset_terminal_fd(fd, true); | |
317 | } | |
318 | ||
319 | int open_terminal(const char *name, int mode) { | |
4768529f | 320 | _cleanup_close_ int fd = -1; |
288a74cc RC |
321 | unsigned c = 0; |
322 | ||
323 | /* | |
4768529f LP |
324 | * If a TTY is in the process of being closed opening it might cause EIO. This is horribly awful, but |
325 | * unlikely to be changed in the kernel. Hence we work around this problem by retrying a couple of | |
326 | * times. | |
288a74cc RC |
327 | * |
328 | * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245 | |
329 | */ | |
330 | ||
35bdab77 LP |
331 | if (mode & O_CREAT) |
332 | return -EINVAL; | |
288a74cc RC |
333 | |
334 | for (;;) { | |
335 | fd = open(name, mode, 0); | |
336 | if (fd >= 0) | |
337 | break; | |
338 | ||
339 | if (errno != EIO) | |
340 | return -errno; | |
341 | ||
342 | /* Max 1s in total */ | |
343 | if (c >= 20) | |
344 | return -errno; | |
345 | ||
4768529f | 346 | (void) usleep(50 * USEC_PER_MSEC); |
288a74cc RC |
347 | c++; |
348 | } | |
349 | ||
4768529f LP |
350 | if (isatty(fd) < 1) |
351 | return negative_errno(); | |
288a74cc | 352 | |
4768529f | 353 | return TAKE_FD(fd); |
288a74cc RC |
354 | } |
355 | ||
356 | int acquire_terminal( | |
357 | const char *name, | |
8854d795 | 358 | AcquireTerminalFlags flags, |
288a74cc RC |
359 | usec_t timeout) { |
360 | ||
8854d795 LP |
361 | _cleanup_close_ int notify = -1, fd = -1; |
362 | usec_t ts = USEC_INFINITY; | |
363 | int r, wd = -1; | |
288a74cc RC |
364 | |
365 | assert(name); | |
8854d795 | 366 | assert(IN_SET(flags & ~ACQUIRE_TERMINAL_PERMISSIVE, ACQUIRE_TERMINAL_TRY, ACQUIRE_TERMINAL_FORCE, ACQUIRE_TERMINAL_WAIT)); |
288a74cc | 367 | |
8854d795 LP |
368 | /* We use inotify to be notified when the tty is closed. We create the watch before checking if we can actually |
369 | * acquire it, so that we don't lose any event. | |
288a74cc | 370 | * |
8854d795 LP |
371 | * Note: strictly speaking this actually watches for the device being closed, it does *not* really watch |
372 | * whether a tty loses its controlling process. However, unless some rogue process uses TIOCNOTTY on /dev/tty | |
f95dbcc2 ZJS |
373 | * *after* closing its tty otherwise this will not become a problem. As long as the administrator makes sure to |
374 | * not configure any service on the same tty as an untrusted user this should not be a problem. (Which they | |
8854d795 LP |
375 | * probably should not do anyway.) */ |
376 | ||
377 | if ((flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_WAIT) { | |
288a74cc | 378 | notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0)); |
8854d795 LP |
379 | if (notify < 0) |
380 | return -errno; | |
288a74cc RC |
381 | |
382 | wd = inotify_add_watch(notify, name, IN_CLOSE); | |
8854d795 LP |
383 | if (wd < 0) |
384 | return -errno; | |
385 | ||
386 | if (timeout != USEC_INFINITY) | |
387 | ts = now(CLOCK_MONOTONIC); | |
288a74cc RC |
388 | } |
389 | ||
390 | for (;;) { | |
391 | struct sigaction sa_old, sa_new = { | |
392 | .sa_handler = SIG_IGN, | |
393 | .sa_flags = SA_RESTART, | |
394 | }; | |
395 | ||
396 | if (notify >= 0) { | |
397 | r = flush_fd(notify); | |
398 | if (r < 0) | |
8854d795 | 399 | return r; |
288a74cc RC |
400 | } |
401 | ||
8854d795 LP |
402 | /* We pass here O_NOCTTY only so that we can check the return value TIOCSCTTY and have a reliable way |
403 | * to figure out if we successfully became the controlling process of the tty */ | |
288a74cc RC |
404 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); |
405 | if (fd < 0) | |
406 | return fd; | |
407 | ||
8854d795 | 408 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed if we already own the tty. */ |
288a74cc RC |
409 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); |
410 | ||
411 | /* First, try to get the tty */ | |
8854d795 LP |
412 | r = ioctl(fd, TIOCSCTTY, |
413 | (flags & ~ACQUIRE_TERMINAL_PERMISSIVE) == ACQUIRE_TERMINAL_FORCE) < 0 ? -errno : 0; | |
288a74cc | 414 | |
8854d795 | 415 | /* Reset signal handler to old value */ |
288a74cc RC |
416 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); |
417 | ||
8854d795 LP |
418 | /* Success? Exit the loop now! */ |
419 | if (r >= 0) | |
420 | break; | |
288a74cc | 421 | |
8854d795 LP |
422 | /* Any failure besides -EPERM? Fail, regardless of the mode. */ |
423 | if (r != -EPERM) | |
424 | return r; | |
288a74cc | 425 | |
8854d795 LP |
426 | if (flags & ACQUIRE_TERMINAL_PERMISSIVE) /* If we are in permissive mode, then EPERM is fine, turn this |
427 | * into a success. Note that EPERM is also returned if we | |
428 | * already are the owner of the TTY. */ | |
288a74cc RC |
429 | break; |
430 | ||
8854d795 LP |
431 | if (flags != ACQUIRE_TERMINAL_WAIT) /* If we are in TRY or FORCE mode, then propagate EPERM as EPERM */ |
432 | return r; | |
433 | ||
288a74cc | 434 | assert(notify >= 0); |
8854d795 | 435 | assert(wd >= 0); |
288a74cc RC |
436 | |
437 | for (;;) { | |
438 | union inotify_event_buffer buffer; | |
439 | struct inotify_event *e; | |
440 | ssize_t l; | |
441 | ||
442 | if (timeout != USEC_INFINITY) { | |
443 | usec_t n; | |
444 | ||
8854d795 LP |
445 | assert(ts != USEC_INFINITY); |
446 | ||
496db330 YW |
447 | n = usec_sub_unsigned(now(CLOCK_MONOTONIC), ts); |
448 | if (n >= timeout) | |
8854d795 | 449 | return -ETIMEDOUT; |
288a74cc | 450 | |
496db330 | 451 | r = fd_wait_for_event(notify, POLLIN, usec_sub_unsigned(timeout, n)); |
288a74cc | 452 | if (r < 0) |
8854d795 LP |
453 | return r; |
454 | if (r == 0) | |
455 | return -ETIMEDOUT; | |
288a74cc RC |
456 | } |
457 | ||
458 | l = read(notify, &buffer, sizeof(buffer)); | |
459 | if (l < 0) { | |
3742095b | 460 | if (IN_SET(errno, EINTR, EAGAIN)) |
288a74cc RC |
461 | continue; |
462 | ||
8854d795 | 463 | return -errno; |
288a74cc RC |
464 | } |
465 | ||
466 | FOREACH_INOTIFY_EVENT(e, buffer, l) { | |
8854d795 LP |
467 | if (e->mask & IN_Q_OVERFLOW) /* If we hit an inotify queue overflow, simply check if the terminal is up for grabs now. */ |
468 | break; | |
469 | ||
470 | if (e->wd != wd || !(e->mask & IN_CLOSE)) /* Safety checks */ | |
471 | return -EIO; | |
288a74cc RC |
472 | } |
473 | ||
474 | break; | |
475 | } | |
476 | ||
8854d795 LP |
477 | /* We close the tty fd here since if the old session ended our handle will be dead. It's important that |
478 | * we do this after sleeping, so that we don't enter an endless loop. */ | |
288a74cc RC |
479 | fd = safe_close(fd); |
480 | } | |
481 | ||
c10d6bdb | 482 | return TAKE_FD(fd); |
288a74cc RC |
483 | } |
484 | ||
485 | int release_terminal(void) { | |
486 | static const struct sigaction sa_new = { | |
487 | .sa_handler = SIG_IGN, | |
488 | .sa_flags = SA_RESTART, | |
489 | }; | |
490 | ||
491 | _cleanup_close_ int fd = -1; | |
492 | struct sigaction sa_old; | |
87964ec7 | 493 | int r; |
288a74cc | 494 | |
0a8b555c | 495 | fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
496 | if (fd < 0) |
497 | return -errno; | |
498 | ||
499 | /* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed | |
500 | * by our own TIOCNOTTY */ | |
501 | assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0); | |
502 | ||
87964ec7 | 503 | r = ioctl(fd, TIOCNOTTY) < 0 ? -errno : 0; |
288a74cc RC |
504 | |
505 | assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0); | |
506 | ||
507 | return r; | |
508 | } | |
509 | ||
510 | int terminal_vhangup_fd(int fd) { | |
511 | assert(fd >= 0); | |
512 | ||
513 | if (ioctl(fd, TIOCVHANGUP) < 0) | |
514 | return -errno; | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
519 | int terminal_vhangup(const char *name) { | |
c2b2df60 | 520 | _cleanup_close_ int fd = -1; |
288a74cc | 521 | |
0a8b555c | 522 | fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); |
288a74cc RC |
523 | if (fd < 0) |
524 | return fd; | |
525 | ||
526 | return terminal_vhangup_fd(fd); | |
527 | } | |
528 | ||
529 | int vt_disallocate(const char *name) { | |
ba5d26cc | 530 | const char *e; |
1ba23931 | 531 | int r; |
288a74cc RC |
532 | |
533 | /* Deallocate the VT if possible. If not possible | |
534 | * (i.e. because it is the active one), at least clear it | |
ba5d26cc | 535 | * entirely (including the scrollback buffer). */ |
288a74cc | 536 | |
27458ed6 LP |
537 | e = path_startswith(name, "/dev/"); |
538 | if (!e) | |
288a74cc RC |
539 | return -EINVAL; |
540 | ||
ba5d26cc ZJS |
541 | if (tty_is_vc(name)) { |
542 | _cleanup_close_ int fd = -1; | |
543 | unsigned u; | |
544 | const char *n; | |
288a74cc | 545 | |
ba5d26cc ZJS |
546 | n = startswith(e, "tty"); |
547 | if (!n) | |
548 | return -EINVAL; | |
288a74cc | 549 | |
ba5d26cc ZJS |
550 | r = safe_atou(n, &u); |
551 | if (r < 0) | |
552 | return r; | |
288a74cc | 553 | |
ba5d26cc ZJS |
554 | if (u <= 0) |
555 | return -EINVAL; | |
288a74cc | 556 | |
ba5d26cc ZJS |
557 | /* Try to deallocate */ |
558 | fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK); | |
559 | if (fd < 0) | |
560 | return fd; | |
288a74cc | 561 | |
ba5d26cc ZJS |
562 | r = ioctl(fd, VT_DISALLOCATE, u); |
563 | if (r >= 0) | |
564 | return 0; | |
565 | if (errno != EBUSY) | |
566 | return -errno; | |
567 | } | |
288a74cc | 568 | |
ba5d26cc ZJS |
569 | /* So this is not a VT (in which case we cannot deallocate it), |
570 | * or we failed to deallocate. Let's at least clear the screen. */ | |
288a74cc | 571 | |
ba5d26cc ZJS |
572 | _cleanup_close_ int fd2 = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC); |
573 | if (fd2 < 0) | |
574 | return fd2; | |
288a74cc | 575 | |
ba5d26cc ZJS |
576 | (void) loop_write(fd2, |
577 | "\033[r" /* clear scrolling region */ | |
578 | "\033[H" /* move home */ | |
579 | "\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */ | |
580 | 10, false); | |
288a74cc RC |
581 | return 0; |
582 | } | |
583 | ||
288a74cc RC |
584 | int make_console_stdio(void) { |
585 | int fd, r; | |
586 | ||
9281e703 LP |
587 | /* Make /dev/console the controlling terminal and stdin/stdout/stderr, if we can. If we can't use |
588 | * /dev/null instead. This is particularly useful if /dev/console is turned off, e.g. if console=null | |
589 | * is specified on the kernel command line. */ | |
288a74cc | 590 | |
8854d795 | 591 | fd = acquire_terminal("/dev/console", ACQUIRE_TERMINAL_FORCE|ACQUIRE_TERMINAL_PERMISSIVE, USEC_INFINITY); |
9281e703 LP |
592 | if (fd < 0) { |
593 | log_warning_errno(fd, "Failed to acquire terminal, using /dev/null stdin/stdout/stderr instead: %m"); | |
288a74cc | 594 | |
9281e703 LP |
595 | r = make_null_stdio(); |
596 | if (r < 0) | |
597 | return log_error_errno(r, "Failed to make /dev/null stdin/stdout/stderr: %m"); | |
3d18b167 | 598 | |
9281e703 LP |
599 | } else { |
600 | r = reset_terminal_fd(fd, true); | |
601 | if (r < 0) | |
602 | log_warning_errno(r, "Failed to reset terminal, ignoring: %m"); | |
288a74cc | 603 | |
9281e703 LP |
604 | r = rearrange_stdio(fd, fd, fd); /* This invalidates 'fd' both on success and on failure. */ |
605 | if (r < 0) | |
606 | return log_error_errno(r, "Failed to make terminal stdin/stdout/stderr: %m"); | |
607 | } | |
c6063244 | 608 | |
9281e703 | 609 | reset_terminal_feature_caches(); |
288a74cc RC |
610 | return 0; |
611 | } | |
612 | ||
288a74cc RC |
613 | bool tty_is_vc(const char *tty) { |
614 | assert(tty); | |
615 | ||
616 | return vtnr_from_tty(tty) >= 0; | |
617 | } | |
618 | ||
619 | bool tty_is_console(const char *tty) { | |
620 | assert(tty); | |
621 | ||
a119ec7c | 622 | return streq(skip_dev_prefix(tty), "console"); |
288a74cc RC |
623 | } |
624 | ||
625 | int vtnr_from_tty(const char *tty) { | |
626 | int i, r; | |
627 | ||
628 | assert(tty); | |
629 | ||
a119ec7c | 630 | tty = skip_dev_prefix(tty); |
288a74cc RC |
631 | |
632 | if (!startswith(tty, "tty") ) | |
633 | return -EINVAL; | |
634 | ||
635 | if (tty[3] < '0' || tty[3] > '9') | |
636 | return -EINVAL; | |
637 | ||
638 | r = safe_atoi(tty+3, &i); | |
639 | if (r < 0) | |
640 | return r; | |
641 | ||
642 | if (i < 0 || i > 63) | |
643 | return -EINVAL; | |
644 | ||
645 | return i; | |
646 | } | |
647 | ||
7b912648 LP |
648 | int resolve_dev_console(char **ret) { |
649 | _cleanup_free_ char *active = NULL; | |
288a74cc | 650 | char *tty; |
7b912648 | 651 | int r; |
288a74cc | 652 | |
7b912648 LP |
653 | assert(ret); |
654 | ||
655 | /* Resolve where /dev/console is pointing to, if /sys is actually ours (i.e. not read-only-mounted which is a | |
656 | * sign for container setups) */ | |
288a74cc RC |
657 | |
658 | if (path_is_read_only_fs("/sys") > 0) | |
7b912648 | 659 | return -ENOMEDIUM; |
288a74cc | 660 | |
7b912648 LP |
661 | r = read_one_line_file("/sys/class/tty/console/active", &active); |
662 | if (r < 0) | |
663 | return r; | |
288a74cc | 664 | |
7b912648 LP |
665 | /* If multiple log outputs are configured the last one is what /dev/console points to */ |
666 | tty = strrchr(active, ' '); | |
288a74cc RC |
667 | if (tty) |
668 | tty++; | |
669 | else | |
7b912648 | 670 | tty = active; |
288a74cc RC |
671 | |
672 | if (streq(tty, "tty0")) { | |
7b912648 | 673 | active = mfree(active); |
288a74cc RC |
674 | |
675 | /* Get the active VC (e.g. tty1) */ | |
7b912648 LP |
676 | r = read_one_line_file("/sys/class/tty/tty0/active", &active); |
677 | if (r < 0) | |
678 | return r; | |
679 | ||
680 | tty = active; | |
681 | } | |
682 | ||
ae2a15bc LP |
683 | if (tty == active) |
684 | *ret = TAKE_PTR(active); | |
685 | else { | |
7b912648 LP |
686 | char *tmp; |
687 | ||
688 | tmp = strdup(tty); | |
689 | if (!tmp) | |
690 | return -ENOMEM; | |
691 | ||
692 | *ret = tmp; | |
288a74cc RC |
693 | } |
694 | ||
7b912648 | 695 | return 0; |
288a74cc RC |
696 | } |
697 | ||
bef41af2 LP |
698 | int get_kernel_consoles(char ***ret) { |
699 | _cleanup_strv_free_ char **l = NULL; | |
6af62124 | 700 | _cleanup_free_ char *line = NULL; |
bef41af2 | 701 | const char *p; |
6af62124 WF |
702 | int r; |
703 | ||
bef41af2 LP |
704 | assert(ret); |
705 | ||
f95dbcc2 | 706 | /* If /sys is mounted read-only this means we are running in some kind of container environment. In that |
bef41af2 LP |
707 | * case /sys would reflect the host system, not us, hence ignore the data we can read from it. */ |
708 | if (path_is_read_only_fs("/sys") > 0) | |
709 | goto fallback; | |
6af62124 WF |
710 | |
711 | r = read_one_line_file("/sys/class/tty/console/active", &line); | |
712 | if (r < 0) | |
713 | return r; | |
714 | ||
bef41af2 | 715 | p = line; |
6af62124 | 716 | for (;;) { |
6abdec98 | 717 | _cleanup_free_ char *tty = NULL, *path = NULL; |
6af62124 | 718 | |
bef41af2 | 719 | r = extract_first_word(&p, &tty, NULL, 0); |
6af62124 WF |
720 | if (r < 0) |
721 | return r; | |
722 | if (r == 0) | |
723 | break; | |
724 | ||
725 | if (streq(tty, "tty0")) { | |
726 | tty = mfree(tty); | |
727 | r = read_one_line_file("/sys/class/tty/tty0/active", &tty); | |
728 | if (r < 0) | |
729 | return r; | |
730 | } | |
731 | ||
6abdec98 | 732 | path = path_join("/dev", tty); |
6af62124 WF |
733 | if (!path) |
734 | return -ENOMEM; | |
735 | ||
736 | if (access(path, F_OK) < 0) { | |
737 | log_debug_errno(errno, "Console device %s is not accessible, skipping: %m", path); | |
6af62124 WF |
738 | continue; |
739 | } | |
740 | ||
6abdec98 | 741 | r = strv_consume(&l, TAKE_PTR(path)); |
6af62124 WF |
742 | if (r < 0) |
743 | return r; | |
744 | } | |
745 | ||
bef41af2 | 746 | if (strv_isempty(l)) { |
6af62124 | 747 | log_debug("No devices found for system console"); |
bef41af2 | 748 | goto fallback; |
6af62124 WF |
749 | } |
750 | ||
ae2a15bc | 751 | *ret = TAKE_PTR(l); |
bef41af2 LP |
752 | |
753 | return 0; | |
754 | ||
755 | fallback: | |
756 | r = strv_extend(&l, "/dev/console"); | |
757 | if (r < 0) | |
758 | return r; | |
759 | ||
ae2a15bc | 760 | *ret = TAKE_PTR(l); |
bef41af2 | 761 | |
6af62124 WF |
762 | return 0; |
763 | } | |
764 | ||
288a74cc | 765 | bool tty_is_vc_resolve(const char *tty) { |
7b912648 | 766 | _cleanup_free_ char *resolved = NULL; |
288a74cc RC |
767 | |
768 | assert(tty); | |
769 | ||
a119ec7c | 770 | tty = skip_dev_prefix(tty); |
288a74cc RC |
771 | |
772 | if (streq(tty, "console")) { | |
7b912648 | 773 | if (resolve_dev_console(&resolved) < 0) |
288a74cc | 774 | return false; |
7b912648 LP |
775 | |
776 | tty = resolved; | |
288a74cc RC |
777 | } |
778 | ||
779 | return tty_is_vc(tty); | |
780 | } | |
781 | ||
782 | const char *default_term_for_tty(const char *tty) { | |
6af760f3 | 783 | return tty && tty_is_vc_resolve(tty) ? "linux" : "vt220"; |
288a74cc RC |
784 | } |
785 | ||
786 | int fd_columns(int fd) { | |
787 | struct winsize ws = {}; | |
788 | ||
14f594b9 LP |
789 | if (fd < 0) |
790 | return -EBADF; | |
791 | ||
288a74cc RC |
792 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) |
793 | return -errno; | |
794 | ||
795 | if (ws.ws_col <= 0) | |
796 | return -EIO; | |
797 | ||
798 | return ws.ws_col; | |
799 | } | |
800 | ||
801 | unsigned columns(void) { | |
802 | const char *e; | |
803 | int c; | |
804 | ||
c6063244 | 805 | if (cached_columns > 0) |
288a74cc RC |
806 | return cached_columns; |
807 | ||
808 | c = 0; | |
809 | e = getenv("COLUMNS"); | |
810 | if (e) | |
811 | (void) safe_atoi(e, &c); | |
812 | ||
d09a7135 | 813 | if (c <= 0 || c > USHRT_MAX) { |
288a74cc | 814 | c = fd_columns(STDOUT_FILENO); |
d09a7135 LP |
815 | if (c <= 0) |
816 | c = 80; | |
817 | } | |
288a74cc RC |
818 | |
819 | cached_columns = c; | |
820 | return cached_columns; | |
821 | } | |
822 | ||
823 | int fd_lines(int fd) { | |
824 | struct winsize ws = {}; | |
825 | ||
14f594b9 LP |
826 | if (fd < 0) |
827 | return -EBADF; | |
828 | ||
288a74cc RC |
829 | if (ioctl(fd, TIOCGWINSZ, &ws) < 0) |
830 | return -errno; | |
831 | ||
832 | if (ws.ws_row <= 0) | |
833 | return -EIO; | |
834 | ||
835 | return ws.ws_row; | |
836 | } | |
837 | ||
838 | unsigned lines(void) { | |
839 | const char *e; | |
840 | int l; | |
841 | ||
c6063244 | 842 | if (cached_lines > 0) |
288a74cc RC |
843 | return cached_lines; |
844 | ||
845 | l = 0; | |
846 | e = getenv("LINES"); | |
847 | if (e) | |
848 | (void) safe_atoi(e, &l); | |
849 | ||
d09a7135 | 850 | if (l <= 0 || l > USHRT_MAX) { |
288a74cc | 851 | l = fd_lines(STDOUT_FILENO); |
d09a7135 LP |
852 | if (l <= 0) |
853 | l = 24; | |
854 | } | |
288a74cc RC |
855 | |
856 | cached_lines = l; | |
857 | return cached_lines; | |
858 | } | |
859 | ||
860 | /* intended to be used as a SIGWINCH sighandler */ | |
861 | void columns_lines_cache_reset(int signum) { | |
862 | cached_columns = 0; | |
863 | cached_lines = 0; | |
864 | } | |
865 | ||
c6063244 LP |
866 | void reset_terminal_feature_caches(void) { |
867 | cached_columns = 0; | |
868 | cached_lines = 0; | |
869 | ||
c4fea19a | 870 | cached_color_mode = _COLOR_INVALID; |
c6063244 LP |
871 | cached_underline_enabled = -1; |
872 | cached_on_tty = -1; | |
873 | } | |
288a74cc | 874 | |
c6063244 | 875 | bool on_tty(void) { |
8cd0356e LP |
876 | |
877 | /* We check both stdout and stderr, so that situations where pipes on the shell are used are reliably | |
878 | * recognized, regardless if only the output or the errors are piped to some place. Since on_tty() is generally | |
879 | * used to default to a safer, non-interactive, non-color mode of operation it's probably good to be defensive | |
880 | * here, and check for both. Note that we don't check for STDIN_FILENO, because it should fine to use fancy | |
881 | * terminal functionality when outputting stuff, even if the input is piped to us. */ | |
882 | ||
c6063244 | 883 | if (cached_on_tty < 0) |
8cd0356e LP |
884 | cached_on_tty = |
885 | isatty(STDOUT_FILENO) > 0 && | |
886 | isatty(STDERR_FILENO) > 0; | |
288a74cc RC |
887 | |
888 | return cached_on_tty; | |
889 | } | |
890 | ||
288a74cc | 891 | int getttyname_malloc(int fd, char **ret) { |
30222f4b | 892 | char path[PATH_MAX], *c; /* PATH_MAX is counted *with* the trailing NUL byte */ |
288a74cc RC |
893 | int r; |
894 | ||
895 | assert(fd >= 0); | |
896 | assert(ret); | |
897 | ||
30222f4b ZJS |
898 | r = ttyname_r(fd, path, sizeof path); /* positive error */ |
899 | assert(r >= 0); | |
900 | if (r == ERANGE) | |
901 | return -ENAMETOOLONG; | |
902 | if (r > 0) | |
903 | return -r; | |
288a74cc | 904 | |
30222f4b ZJS |
905 | c = strdup(skip_dev_prefix(path)); |
906 | if (!c) | |
907 | return -ENOMEM; | |
288a74cc | 908 | |
30222f4b | 909 | *ret = c; |
288a74cc RC |
910 | return 0; |
911 | } | |
912 | ||
f171decd LP |
913 | int getttyname_harder(int fd, char **ret) { |
914 | _cleanup_free_ char *s = NULL; | |
915 | int r; | |
288a74cc | 916 | |
f171decd LP |
917 | r = getttyname_malloc(fd, &s); |
918 | if (r < 0) | |
919 | return r; | |
288a74cc | 920 | |
f171decd LP |
921 | if (streq(s, "tty")) |
922 | return get_ctty(0, NULL, ret); | |
288a74cc | 923 | |
f171decd | 924 | *ret = TAKE_PTR(s); |
288a74cc RC |
925 | return 0; |
926 | } | |
927 | ||
928 | int get_ctty_devnr(pid_t pid, dev_t *d) { | |
929 | int r; | |
930 | _cleanup_free_ char *line = NULL; | |
931 | const char *p; | |
932 | unsigned long ttynr; | |
933 | ||
934 | assert(pid >= 0); | |
935 | ||
936 | p = procfs_file_alloca(pid, "stat"); | |
937 | r = read_one_line_file(p, &line); | |
938 | if (r < 0) | |
939 | return r; | |
940 | ||
941 | p = strrchr(line, ')'); | |
942 | if (!p) | |
943 | return -EIO; | |
944 | ||
945 | p++; | |
946 | ||
947 | if (sscanf(p, " " | |
948 | "%*c " /* state */ | |
949 | "%*d " /* ppid */ | |
950 | "%*d " /* pgrp */ | |
951 | "%*d " /* session */ | |
952 | "%lu ", /* ttynr */ | |
953 | &ttynr) != 1) | |
954 | return -EIO; | |
955 | ||
956 | if (major(ttynr) == 0 && minor(ttynr) == 0) | |
cfeaa44a | 957 | return -ENXIO; |
288a74cc RC |
958 | |
959 | if (d) | |
960 | *d = (dev_t) ttynr; | |
961 | ||
962 | return 0; | |
963 | } | |
964 | ||
54b22b26 | 965 | int get_ctty(pid_t pid, dev_t *ret_devnr, char **ret) { |
11f3c130 LP |
966 | char pty[STRLEN("/dev/pts/") + DECIMAL_STR_MAX(dev_t) + 1]; |
967 | _cleanup_free_ char *buf = NULL; | |
968 | const char *fn = NULL, *w; | |
288a74cc | 969 | dev_t devnr; |
54b22b26 | 970 | int r; |
288a74cc | 971 | |
54b22b26 LP |
972 | r = get_ctty_devnr(pid, &devnr); |
973 | if (r < 0) | |
974 | return r; | |
288a74cc | 975 | |
11f3c130 | 976 | r = device_path_make_canonical(S_IFCHR, devnr, &buf); |
54b22b26 | 977 | if (r < 0) { |
11f3c130 LP |
978 | struct stat st; |
979 | ||
54b22b26 LP |
980 | if (r != -ENOENT) /* No symlink for this in /dev/char/? */ |
981 | return r; | |
288a74cc | 982 | |
11f3c130 LP |
983 | /* Maybe this is PTY? PTY devices are not listed in /dev/char/, as they don't follow the |
984 | * Linux device model and hence device_path_make_canonical() doesn't work for them. Let's | |
985 | * assume this is a PTY for a moment, and check if the device node this would then map to in | |
986 | * /dev/pts/ matches the one we are looking for. This way we don't have to hardcode the major | |
987 | * number (which is 136 btw), but we still rely on the fact that PTY numbers map directly to | |
988 | * the minor number of the pty. */ | |
989 | xsprintf(pty, "/dev/pts/%u", minor(devnr)); | |
990 | ||
991 | if (stat(pty, &st) < 0) { | |
992 | if (errno != ENOENT) | |
993 | return -errno; | |
54b22b26 | 994 | |
11f3c130 LP |
995 | } else if (S_ISCHR(st.st_mode) && devnr == st.st_rdev) /* Bingo! */ |
996 | fn = pty; | |
288a74cc | 997 | |
11f3c130 LP |
998 | if (!fn) { |
999 | /* Doesn't exist, or not a PTY? Probably something similar to the PTYs which have no | |
1000 | * symlink in /dev/char/. Let's return something vaguely useful. */ | |
1001 | r = device_path_make_major_minor(S_IFCHR, devnr, &buf); | |
54b22b26 LP |
1002 | if (r < 0) |
1003 | return r; | |
11f3c130 LP |
1004 | |
1005 | fn = buf; | |
288a74cc | 1006 | } |
11f3c130 LP |
1007 | } else |
1008 | fn = buf; | |
288a74cc | 1009 | |
11f3c130 LP |
1010 | w = path_startswith(fn, "/dev/"); |
1011 | if (!w) | |
1012 | return -EINVAL; | |
54b22b26 | 1013 | |
11f3c130 LP |
1014 | if (ret) { |
1015 | _cleanup_free_ char *b = NULL; | |
1016 | ||
1017 | b = strdup(w); | |
1018 | if (!b) | |
1019 | return -ENOMEM; | |
288a74cc | 1020 | |
54b22b26 | 1021 | *ret = TAKE_PTR(b); |
11f3c130 | 1022 | } |
54b22b26 LP |
1023 | |
1024 | if (ret_devnr) | |
1025 | *ret_devnr = devnr; | |
288a74cc RC |
1026 | |
1027 | return 0; | |
1028 | } | |
a07c35c3 | 1029 | |
66cb2fde LP |
1030 | int ptsname_malloc(int fd, char **ret) { |
1031 | size_t l = 100; | |
1032 | ||
1033 | assert(fd >= 0); | |
1034 | assert(ret); | |
1035 | ||
1036 | for (;;) { | |
1037 | char *c; | |
1038 | ||
1039 | c = new(char, l); | |
1040 | if (!c) | |
1041 | return -ENOMEM; | |
1042 | ||
1043 | if (ptsname_r(fd, c, l) == 0) { | |
1044 | *ret = c; | |
1045 | return 0; | |
1046 | } | |
1047 | if (errno != ERANGE) { | |
1048 | free(c); | |
1049 | return -errno; | |
1050 | } | |
1051 | ||
1052 | free(c); | |
1fd4c4ed LP |
1053 | |
1054 | if (l > SIZE_MAX / 2) | |
1055 | return -ENOMEM; | |
1056 | ||
66cb2fde LP |
1057 | l *= 2; |
1058 | } | |
1059 | } | |
1060 | ||
ae1d13db FB |
1061 | int openpt_allocate(int flags, char **ret_slave) { |
1062 | _cleanup_close_ int fd = -1; | |
1063 | _cleanup_free_ char *p = NULL; | |
1064 | int r; | |
1065 | ||
1066 | fd = posix_openpt(flags|O_NOCTTY|O_CLOEXEC); | |
1067 | if (fd < 0) | |
1068 | return -errno; | |
1069 | ||
1070 | if (ret_slave) { | |
1071 | r = ptsname_malloc(fd, &p); | |
1072 | if (r < 0) | |
1073 | return r; | |
1074 | ||
1075 | if (!path_startswith(p, "/dev/pts/")) | |
1076 | return -EINVAL; | |
1077 | } | |
1078 | ||
1079 | if (unlockpt(fd) < 0) | |
1080 | return -errno; | |
1081 | ||
1082 | if (ret_slave) | |
1083 | *ret_slave = TAKE_PTR(p); | |
1084 | ||
1085 | return TAKE_FD(fd); | |
1086 | } | |
1087 | ||
1088 | static int ptsname_namespace(int pty, char **ret) { | |
a07c35c3 LP |
1089 | int no = -1, r; |
1090 | ||
1091 | /* Like ptsname(), but doesn't assume that the path is | |
1092 | * accessible in the local namespace. */ | |
1093 | ||
1094 | r = ioctl(pty, TIOCGPTN, &no); | |
1095 | if (r < 0) | |
1096 | return -errno; | |
1097 | ||
1098 | if (no < 0) | |
1099 | return -EIO; | |
1100 | ||
1101 | if (asprintf(ret, "/dev/pts/%i", no) < 0) | |
1102 | return -ENOMEM; | |
1103 | ||
1104 | return 0; | |
1105 | } | |
66cb2fde | 1106 | |
ae1d13db FB |
1107 | int openpt_allocate_in_namespace(pid_t pid, int flags, char **ret_slave) { |
1108 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1, fd = -1; | |
66cb2fde | 1109 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; |
66cb2fde LP |
1110 | pid_t child; |
1111 | int r; | |
1112 | ||
1113 | assert(pid > 0); | |
1114 | ||
1115 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1116 | if (r < 0) | |
1117 | return r; | |
1118 | ||
1119 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1120 | return -errno; | |
1121 | ||
1edcb6a9 LP |
1122 | r = namespace_fork("(sd-openptns)", "(sd-openpt)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG, |
1123 | pidnsfd, mntnsfd, -1, usernsfd, rootfd, &child); | |
4c253ed1 LP |
1124 | if (r < 0) |
1125 | return r; | |
1126 | if (r == 0) { | |
66cb2fde LP |
1127 | pair[0] = safe_close(pair[0]); |
1128 | ||
ae1d13db FB |
1129 | fd = openpt_allocate(flags, NULL); |
1130 | if (fd < 0) | |
66cb2fde LP |
1131 | _exit(EXIT_FAILURE); |
1132 | ||
ae1d13db | 1133 | if (send_one_fd(pair[1], fd, 0) < 0) |
66cb2fde LP |
1134 | _exit(EXIT_FAILURE); |
1135 | ||
1136 | _exit(EXIT_SUCCESS); | |
1137 | } | |
1138 | ||
1139 | pair[1] = safe_close(pair[1]); | |
1140 | ||
1edcb6a9 | 1141 | r = wait_for_terminate_and_check("(sd-openptns)", child, 0); |
66cb2fde LP |
1142 | if (r < 0) |
1143 | return r; | |
2e87a1fd | 1144 | if (r != EXIT_SUCCESS) |
66cb2fde LP |
1145 | return -EIO; |
1146 | ||
ae1d13db FB |
1147 | fd = receive_one_fd(pair[0], 0); |
1148 | if (fd < 0) | |
1149 | return fd; | |
1150 | ||
1151 | if (ret_slave) { | |
1152 | r = ptsname_namespace(fd, ret_slave); | |
1153 | if (r < 0) | |
1154 | return r; | |
1155 | } | |
1156 | ||
1157 | return TAKE_FD(fd); | |
66cb2fde | 1158 | } |
40e1f4ea LP |
1159 | |
1160 | int open_terminal_in_namespace(pid_t pid, const char *name, int mode) { | |
1161 | _cleanup_close_ int pidnsfd = -1, mntnsfd = -1, usernsfd = -1, rootfd = -1; | |
1162 | _cleanup_close_pair_ int pair[2] = { -1, -1 }; | |
40e1f4ea LP |
1163 | pid_t child; |
1164 | int r; | |
1165 | ||
1166 | r = namespace_open(pid, &pidnsfd, &mntnsfd, NULL, &usernsfd, &rootfd); | |
1167 | if (r < 0) | |
1168 | return r; | |
1169 | ||
1170 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, pair) < 0) | |
1171 | return -errno; | |
1172 | ||
1edcb6a9 LP |
1173 | r = namespace_fork("(sd-terminalns)", "(sd-terminal)", NULL, 0, FORK_RESET_SIGNALS|FORK_DEATHSIG, |
1174 | pidnsfd, mntnsfd, -1, usernsfd, rootfd, &child); | |
4c253ed1 LP |
1175 | if (r < 0) |
1176 | return r; | |
1177 | if (r == 0) { | |
40e1f4ea LP |
1178 | int master; |
1179 | ||
1180 | pair[0] = safe_close(pair[0]); | |
1181 | ||
40e1f4ea LP |
1182 | master = open_terminal(name, mode|O_NOCTTY|O_CLOEXEC); |
1183 | if (master < 0) | |
1184 | _exit(EXIT_FAILURE); | |
1185 | ||
1186 | if (send_one_fd(pair[1], master, 0) < 0) | |
1187 | _exit(EXIT_FAILURE); | |
1188 | ||
1189 | _exit(EXIT_SUCCESS); | |
1190 | } | |
1191 | ||
1192 | pair[1] = safe_close(pair[1]); | |
1193 | ||
1edcb6a9 | 1194 | r = wait_for_terminate_and_check("(sd-terminalns)", child, 0); |
40e1f4ea LP |
1195 | if (r < 0) |
1196 | return r; | |
2e87a1fd | 1197 | if (r != EXIT_SUCCESS) |
40e1f4ea LP |
1198 | return -EIO; |
1199 | ||
1200 | return receive_one_fd(pair[0], 0); | |
1201 | } | |
40c9fe4c | 1202 | |
158fbf76 | 1203 | static bool getenv_terminal_is_dumb(void) { |
ac96418b LP |
1204 | const char *e; |
1205 | ||
ac96418b LP |
1206 | e = getenv("TERM"); |
1207 | if (!e) | |
1208 | return true; | |
1209 | ||
1210 | return streq(e, "dumb"); | |
1211 | } | |
1212 | ||
158fbf76 ZJS |
1213 | bool terminal_is_dumb(void) { |
1214 | if (!on_tty()) | |
1215 | return true; | |
1216 | ||
1217 | return getenv_terminal_is_dumb(); | |
1218 | } | |
1219 | ||
c4fea19a MGR |
1220 | static ColorMode parse_systemd_colors(void) { |
1221 | const char *e; | |
1222 | int r; | |
ae5b3958 | 1223 | |
c4fea19a MGR |
1224 | e = getenv("SYSTEMD_COLORS"); |
1225 | if (!e) | |
1226 | return _COLOR_INVALID; | |
1227 | if (streq(e, "16")) | |
1228 | return COLOR_16; | |
1229 | if (streq(e, "256")) | |
1230 | return COLOR_256; | |
1231 | r = parse_boolean(e); | |
1232 | if (r >= 0) | |
1233 | return r > 0 ? COLOR_ON : COLOR_OFF; | |
1234 | return _COLOR_INVALID; | |
1235 | } | |
c484315b | 1236 | |
c4fea19a MGR |
1237 | ColorMode get_color_mode(void) { |
1238 | ||
1239 | /* Returns the mode used to choose output colors. The possible modes are COLOR_OFF for no colors, | |
1240 | * COLOR_16 for only the base 16 ANSI colors, COLOR_256 for more colors and COLOR_ON for unrestricted | |
1241 | * color output. For that we check $SYSTEMD_COLORS first (which is the explicit way to | |
1242 | * 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 | |
1243 | * 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 | |
1244 | * check whether we are connected to a TTY, because we don't keep /dev/console open continuously due to fear | |
1245 | * of SAK, and hence things are a bit weird. */ | |
1246 | ColorMode m; | |
1247 | ||
1248 | if (cached_color_mode < 0) { | |
1249 | m = parse_systemd_colors(); | |
1250 | if (m >= 0) | |
1251 | cached_color_mode = m; | |
c484315b ZJS |
1252 | else if (getenv("NO_COLOR")) |
1253 | /* We only check for the presence of the variable; value is ignored. */ | |
c4fea19a | 1254 | cached_color_mode = COLOR_OFF; |
c484315b | 1255 | |
df0ff127 | 1256 | else if (getpid_cached() == 1) |
c4fea19a | 1257 | /* PID1 outputs to the console without holding it open all the time. |
ddbf9605 LP |
1258 | * |
1259 | * Note that the Linux console can only display 16 colors. We still enable 256 color | |
1260 | * mode even for PID1 output though (which typically goes to the Linux console), | |
1261 | * since the Linux console is able to parse the 256 color sequences and automatically | |
1262 | * map them to the closest color in the 16 color palette (since kernel 3.16). Doing | |
1263 | * 256 colors is nice for people who invoke systemd in a container or via a serial | |
1264 | * link or such, and use a true 256 color terminal to do so. */ | |
1265 | cached_color_mode = getenv_terminal_is_dumb() ? COLOR_OFF : COLOR_256; | |
ae5b3958 | 1266 | else |
c4fea19a | 1267 | cached_color_mode = terminal_is_dumb() ? COLOR_OFF : COLOR_256; |
40c9fe4c JS |
1268 | } |
1269 | ||
c4fea19a MGR |
1270 | return cached_color_mode; |
1271 | } | |
1272 | ||
c2b32159 LP |
1273 | bool dev_console_colors_enabled(void) { |
1274 | _cleanup_free_ char *s = NULL; | |
c4fea19a | 1275 | ColorMode m; |
c2b32159 LP |
1276 | |
1277 | /* Returns true if we assume that color is supported on /dev/console. | |
1278 | * | |
1279 | * For that we first check if we explicitly got told to use colors or not, by checking $SYSTEMD_COLORS. If that | |
f95dbcc2 ZJS |
1280 | * isn't set we check whether PID 1 has $TERM set, and if not, whether TERM is set on the kernel command |
1281 | * line. If we find $TERM set we assume color if it's not set to "dumb", similarly to how regular | |
c2b32159 LP |
1282 | * colors_enabled() operates. */ |
1283 | ||
c4fea19a MGR |
1284 | m = parse_systemd_colors(); |
1285 | if (m >= 0) | |
1286 | return m; | |
c2b32159 | 1287 | |
c484315b ZJS |
1288 | if (getenv("NO_COLOR")) |
1289 | return false; | |
1290 | ||
c2b32159 LP |
1291 | if (getenv_for_pid(1, "TERM", &s) <= 0) |
1292 | (void) proc_cmdline_get_key("TERM", 0, &s); | |
1293 | ||
1294 | return !streq_ptr(s, "dumb"); | |
1295 | } | |
1296 | ||
526664f6 | 1297 | bool underline_enabled(void) { |
526664f6 | 1298 | |
c6063244 | 1299 | if (cached_underline_enabled < 0) { |
526664f6 LP |
1300 | |
1301 | /* The Linux console doesn't support underlining, turn it off, but only there. */ | |
1302 | ||
c6063244 LP |
1303 | if (colors_enabled()) |
1304 | cached_underline_enabled = !streq_ptr(getenv("TERM"), "linux"); | |
526664f6 | 1305 | else |
c6063244 | 1306 | cached_underline_enabled = false; |
526664f6 LP |
1307 | } |
1308 | ||
c6063244 | 1309 | return cached_underline_enabled; |
526664f6 LP |
1310 | } |
1311 | ||
c83f349c LP |
1312 | int vt_default_utf8(void) { |
1313 | _cleanup_free_ char *b = NULL; | |
1314 | int r; | |
1315 | ||
1316 | /* Read the default VT UTF8 setting from the kernel */ | |
1317 | ||
1318 | r = read_one_line_file("/sys/module/vt/parameters/default_utf8", &b); | |
1319 | if (r < 0) | |
1320 | return r; | |
1321 | ||
1322 | return parse_boolean(b); | |
1323 | } | |
1324 | ||
1325 | int vt_reset_keyboard(int fd) { | |
15bba613 | 1326 | int kb; |
c83f349c LP |
1327 | |
1328 | /* If we can't read the default, then default to unicode. It's 2017 after all. */ | |
1329 | kb = vt_default_utf8() != 0 ? K_UNICODE : K_XLATE; | |
1330 | ||
1331 | if (ioctl(fd, KDSKBMODE, kb) < 0) | |
1332 | return -errno; | |
1333 | ||
1334 | return 0; | |
1335 | } | |
6179ede1 FB |
1336 | |
1337 | int vt_restore(int fd) { | |
1338 | static const struct vt_mode mode = { | |
1339 | .mode = VT_AUTO, | |
1340 | }; | |
1341 | int r, q = 0; | |
1342 | ||
e60a4a3c LP |
1343 | if (isatty(fd) < 1) |
1344 | return log_debug_errno(errno, "Asked to restore the VT for an fd that does not refer to a terminal: %m"); | |
1345 | ||
1802d5f2 | 1346 | if (ioctl(fd, KDSETMODE, KD_TEXT) < 0) |
6179ede1 FB |
1347 | q = log_debug_errno(errno, "Failed to set VT in text mode, ignoring: %m"); |
1348 | ||
1349 | r = vt_reset_keyboard(fd); | |
1350 | if (r < 0) { | |
1351 | log_debug_errno(r, "Failed to reset keyboard mode, ignoring: %m"); | |
1352 | if (q >= 0) | |
1353 | q = r; | |
1354 | } | |
1355 | ||
1802d5f2 | 1356 | if (ioctl(fd, VT_SETMODE, &mode) < 0) { |
6179ede1 FB |
1357 | log_debug_errno(errno, "Failed to set VT_AUTO mode, ignoring: %m"); |
1358 | if (q >= 0) | |
1359 | q = -errno; | |
1360 | } | |
1361 | ||
f5fbe71d | 1362 | r = fchmod_and_chown(fd, TTY_MODE, 0, GID_INVALID); |
6179ede1 | 1363 | if (r < 0) { |
1802d5f2 | 1364 | log_debug_errno(r, "Failed to chmod()/chown() VT, ignoring: %m"); |
6179ede1 | 1365 | if (q >= 0) |
1802d5f2 | 1366 | q = r; |
6179ede1 FB |
1367 | } |
1368 | ||
1369 | return q; | |
1370 | } | |
27dafac9 FB |
1371 | |
1372 | int vt_release(int fd, bool restore) { | |
1373 | assert(fd >= 0); | |
1374 | ||
1375 | /* This function releases the VT by acknowledging the VT-switch signal | |
1376 | * sent by the kernel and optionally reset the VT in text and auto | |
1377 | * VT-switching modes. */ | |
1378 | ||
e60a4a3c LP |
1379 | if (isatty(fd) < 1) |
1380 | return log_debug_errno(errno, "Asked to release the VT for an fd that does not refer to a terminal: %m"); | |
1381 | ||
27dafac9 FB |
1382 | if (ioctl(fd, VT_RELDISP, 1) < 0) |
1383 | return -errno; | |
1384 | ||
1385 | if (restore) | |
1386 | return vt_restore(fd); | |
1387 | ||
1388 | return 0; | |
1389 | } | |
37b8d2f6 ZJS |
1390 | |
1391 | void get_log_colors(int priority, const char **on, const char **off, const char **highlight) { | |
1392 | /* Note that this will initialize output variables only when there's something to output. | |
5e2b0e1c | 1393 | * The caller must pre-initialize to "" or NULL as appropriate. */ |
37b8d2f6 ZJS |
1394 | |
1395 | if (priority <= LOG_ERR) { | |
1396 | if (on) | |
25e4608b | 1397 | *on = ansi_highlight_red(); |
37b8d2f6 | 1398 | if (off) |
bb146d23 | 1399 | *off = ansi_normal(); |
37b8d2f6 | 1400 | if (highlight) |
bb146d23 | 1401 | *highlight = ansi_highlight(); |
37b8d2f6 | 1402 | |
0d0464d3 ZJS |
1403 | } else if (priority <= LOG_WARNING) { |
1404 | if (on) | |
25e4608b | 1405 | *on = ansi_highlight_yellow(); |
0d0464d3 | 1406 | if (off) |
bb146d23 | 1407 | *off = ansi_normal(); |
0d0464d3 | 1408 | if (highlight) |
bb146d23 | 1409 | *highlight = ansi_highlight(); |
0d0464d3 | 1410 | |
37b8d2f6 ZJS |
1411 | } else if (priority <= LOG_NOTICE) { |
1412 | if (on) | |
bb146d23 | 1413 | *on = ansi_highlight(); |
37b8d2f6 | 1414 | if (off) |
bb146d23 | 1415 | *off = ansi_normal(); |
37b8d2f6 | 1416 | if (highlight) |
25e4608b | 1417 | *highlight = ansi_highlight_red(); |
37b8d2f6 ZJS |
1418 | |
1419 | } else if (priority >= LOG_DEBUG) { | |
1420 | if (on) | |
25e4608b | 1421 | *on = ansi_grey(); |
37b8d2f6 | 1422 | if (off) |
bb146d23 | 1423 | *off = ansi_normal(); |
37b8d2f6 | 1424 | if (highlight) |
25e4608b | 1425 | *highlight = ansi_highlight_red(); |
37b8d2f6 ZJS |
1426 | } |
1427 | } |