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Commit | Line | Data |
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cc73685d | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b0a33c1e | 2 | |
d38dd64a CB |
3 | #ifndef _GNU_SOURCE |
4 | #define _GNU_SOURCE 1 | |
5 | #endif | |
9395937a CB |
6 | #include <errno.h> |
7 | #include <fcntl.h> | |
b467714b | 8 | #include <pthread.h> |
b5159817 | 9 | #include <signal.h> |
b0a33c1e | 10 | #include <stdio.h> |
e0dc0de7 | 11 | #include <stdlib.h> |
da41561c CB |
12 | #include <sys/epoll.h> |
13 | #include <sys/types.h> | |
e62912bd CB |
14 | #include <termios.h> |
15 | #include <unistd.h> | |
f2363e38 | 16 | |
12ae2a33 CB |
17 | #include "lxc.h" |
18 | ||
9395937a CB |
19 | #include "af_unix.h" |
20 | #include "caps.h" | |
21 | #include "commands.h" | |
00dbc43e | 22 | #include "conf.h" |
e827ff7e | 23 | #include "config.h" |
9395937a | 24 | #include "log.h" |
b5159817 | 25 | #include "lxclock.h" |
9395937a | 26 | #include "mainloop.h" |
2530ba95 | 27 | #include "memory_utils.h" |
e62912bd | 28 | #include "start.h" |
303037d2 | 29 | #include "syscall_wrappers.h" |
0ed9b1bc | 30 | #include "terminal.h" |
b5159817 | 31 | #include "utils.h" |
36eb9bde | 32 | |
35eb5cdc | 33 | #if HAVE_OPENPTY |
e827ff7e SG |
34 | #include <pty.h> |
35 | #else | |
58db1a61 | 36 | #include "openpty.h" |
e827ff7e SG |
37 | #endif |
38 | ||
de708fb7 | 39 | #define LXC_TERMINAL_BUFFER_SIZE 1024 |
732375f5 | 40 | |
2083d59d | 41 | lxc_log_define(terminal, lxc); |
36eb9bde | 42 | |
4e9c0330 | 43 | void lxc_terminal_winsz(int srcfd, int dstfd) |
b5159817 | 44 | { |
0519b5cc | 45 | int ret; |
b5159817 | 46 | struct winsize wsz; |
0519b5cc CB |
47 | |
48 | if (!isatty(srcfd)) | |
49 | return; | |
50 | ||
51 | ret = ioctl(srcfd, TIOCGWINSZ, &wsz); | |
52 | if (ret < 0) { | |
53 | WARN("Failed to get window size"); | |
54 | return; | |
724e753c | 55 | } |
0519b5cc CB |
56 | |
57 | ret = ioctl(dstfd, TIOCSWINSZ, &wsz); | |
58 | if (ret < 0) | |
59 | WARN("Failed to set window size"); | |
60 | else | |
61 | DEBUG("Set window size to %d columns and %d rows", wsz.ws_col, | |
62 | wsz.ws_row); | |
63 | ||
64 | return; | |
b5159817 | 65 | } |
724e753c | 66 | |
5b55021f | 67 | static void lxc_terminal_winch(struct lxc_terminal_state *ts) |
b5159817 | 68 | { |
36a94ce8 | 69 | lxc_terminal_winsz(ts->stdinfd, ts->ptxfd); |
b5159817 | 70 | } |
cd453b38 | 71 | |
9bafc8cb | 72 | int lxc_terminal_signalfd_cb(int fd, uint32_t events, void *cbdata, |
3298b37d | 73 | struct lxc_async_descr *descr) |
b5159817 | 74 | { |
1349e92e | 75 | ssize_t ret; |
b5159817 | 76 | struct signalfd_siginfo siginfo; |
5b55021f | 77 | struct lxc_terminal_state *ts = cbdata; |
b5159817 | 78 | |
72f7c19b | 79 | ret = lxc_read_nointr(fd, &siginfo, sizeof(siginfo)); |
0d4137cc | 80 | if (ret < 0 || (size_t)ret < sizeof(siginfo)) { |
0519b5cc | 81 | ERROR("Failed to read signal info"); |
2e943b7b | 82 | return LXC_MAINLOOP_ERROR; |
cd453b38 DL |
83 | } |
84 | ||
1349e92e | 85 | if (siginfo.ssi_signo == SIGTERM) { |
9bafc8cb | 86 | DEBUG("Received SIGTERM. Detaching from the terminal"); |
a529bc25 | 87 | return LXC_MAINLOOP_CLOSE; |
1349e92e CB |
88 | } |
89 | ||
90 | if (siginfo.ssi_signo == SIGWINCH) | |
7a10164a | 91 | lxc_terminal_winch(ts); |
1349e92e | 92 | |
2e943b7b | 93 | return LXC_MAINLOOP_CONTINUE; |
b5159817 DE |
94 | } |
95 | ||
5b55021f | 96 | struct lxc_terminal_state *lxc_terminal_signal_init(int srcfd, int dstfd) |
b5159817 | 97 | { |
f62cf1d4 | 98 | __do_close int signal_fd = -EBADF; |
28327a43 | 99 | __do_free struct lxc_terminal_state *ts = NULL; |
28327a43 | 100 | int ret; |
b5159817 | 101 | sigset_t mask; |
b5159817 DE |
102 | |
103 | ts = malloc(sizeof(*ts)); | |
104 | if (!ts) | |
105 | return NULL; | |
106 | ||
107 | memset(ts, 0, sizeof(*ts)); | |
341c2aed | 108 | ts->stdinfd = srcfd; |
36a94ce8 | 109 | ts->ptxfd = dstfd; |
341c2aed | 110 | ts->sigfd = -1; |
b5159817 | 111 | |
b6d5de95 CB |
112 | ret = sigemptyset(&mask); |
113 | if (ret < 0) { | |
114 | SYSERROR("Failed to initialize an empty signal set"); | |
1ba4ae89 | 115 | return NULL; |
b6d5de95 | 116 | } |
1349e92e | 117 | |
1ba4ae89 | 118 | if (isatty(srcfd)) { |
b6d5de95 CB |
119 | ret = sigaddset(&mask, SIGWINCH); |
120 | if (ret < 0) | |
7874d81a | 121 | SYSNOTICE("Failed to add SIGWINCH to signal set"); |
1ba4ae89 CB |
122 | } else { |
123 | INFO("fd %d does not refer to a tty device", srcfd); | |
25964232 LF |
124 | } |
125 | ||
1349e92e | 126 | /* Exit the mainloop cleanly on SIGTERM. */ |
b6d5de95 CB |
127 | ret = sigaddset(&mask, SIGTERM); |
128 | if (ret < 0) { | |
129 | SYSERROR("Failed to add SIGWINCH to signal set"); | |
1ba4ae89 | 130 | return NULL; |
b6d5de95 | 131 | } |
b5159817 | 132 | |
b467714b | 133 | ret = pthread_sigmask(SIG_BLOCK, &mask, &ts->oldmask); |
1349e92e CB |
134 | if (ret < 0) { |
135 | WARN("Failed to block signals"); | |
1ba4ae89 | 136 | return NULL; |
b5159817 DE |
137 | } |
138 | ||
1ba4ae89 CB |
139 | signal_fd = signalfd(-1, &mask, SFD_CLOEXEC); |
140 | if (signal_fd < 0) { | |
1349e92e | 141 | WARN("Failed to create signal fd"); |
b467714b | 142 | (void)pthread_sigmask(SIG_SETMASK, &ts->oldmask, NULL); |
1ba4ae89 | 143 | return NULL; |
1349e92e | 144 | } |
1ba4ae89 CB |
145 | ts->sigfd = move_fd(signal_fd); |
146 | TRACE("Created signal fd %d", ts->sigfd); | |
b6d5de95 | 147 | |
1ba4ae89 | 148 | return move_ptr(ts); |
cd453b38 DL |
149 | } |
150 | ||
3e3f79bd CB |
151 | int lxc_terminal_signal_sigmask_safe_blocked(struct lxc_terminal *terminal) |
152 | { | |
153 | struct lxc_terminal_state *state = terminal->tty_state; | |
154 | ||
155 | if (!state) | |
156 | return 0; | |
157 | ||
158 | return pthread_sigmask(SIG_SETMASK, &state->oldmask, NULL); | |
159 | } | |
160 | ||
26ed61e0 CB |
161 | /** |
162 | * lxc_terminal_signal_fini: uninstall signal handler | |
163 | * | |
164 | * @terminal: terminal instance | |
165 | * | |
166 | * Restore the saved signal handler that was in effect at the time | |
167 | * lxc_terminal_signal_init() was called. | |
168 | */ | |
169 | static void lxc_terminal_signal_fini(struct lxc_terminal *terminal) | |
63376d7d | 170 | { |
28327a43 | 171 | struct lxc_terminal_state *state = terminal->tty_state; |
1349e92e | 172 | |
28327a43 CB |
173 | if (!terminal->tty_state) |
174 | return; | |
175 | ||
176 | state = terminal->tty_state; | |
177 | if (state->sigfd >= 0) { | |
178 | close(state->sigfd); | |
179 | ||
180 | if (pthread_sigmask(SIG_SETMASK, &state->oldmask, NULL) < 0) | |
a24c5678 | 181 | SYSWARN("Failed to restore signal mask"); |
0e6da90b | 182 | } |
0d4137cc | 183 | |
28327a43 CB |
184 | free(terminal->tty_state); |
185 | terminal->tty_state = NULL; | |
b5159817 | 186 | } |
1560f6c9 | 187 | |
99a04585 | 188 | static int lxc_terminal_truncate_log_file(struct lxc_terminal *terminal) |
861813e5 CB |
189 | { |
190 | /* be very certain things are kosher */ | |
2083d59d | 191 | if (!terminal->log_path || terminal->log_fd < 0) |
861813e5 CB |
192 | return -EBADF; |
193 | ||
2083d59d | 194 | return lxc_unpriv(ftruncate(terminal->log_fd, 0)); |
861813e5 CB |
195 | } |
196 | ||
468724d3 | 197 | static int lxc_terminal_rotate_log_file(struct lxc_terminal *terminal) |
861813e5 | 198 | { |
2530ba95 | 199 | __do_free char *tmp = NULL; |
861813e5 CB |
200 | int ret; |
201 | size_t len; | |
861813e5 | 202 | |
99a04585 | 203 | if (!terminal->log_path || terminal->log_rotate == 0) |
861813e5 CB |
204 | return -EOPNOTSUPP; |
205 | ||
206 | /* be very certain things are kosher */ | |
99a04585 | 207 | if (terminal->log_fd < 0) |
861813e5 CB |
208 | return -EBADF; |
209 | ||
99a04585 | 210 | len = strlen(terminal->log_path) + sizeof(".1"); |
2530ba95 | 211 | tmp = must_realloc(NULL, len); |
861813e5 | 212 | |
93d5ebf1 CB |
213 | ret = strnprintf(tmp, len, "%s.1", terminal->log_path); |
214 | if (ret < 0) | |
861813e5 CB |
215 | return -EFBIG; |
216 | ||
99a04585 CB |
217 | close(terminal->log_fd); |
218 | terminal->log_fd = -1; | |
219 | ret = lxc_unpriv(rename(terminal->log_path, tmp)); | |
861813e5 CB |
220 | if (ret < 0) |
221 | return ret; | |
222 | ||
99a04585 | 223 | return lxc_terminal_create_log_file(terminal); |
861813e5 CB |
224 | } |
225 | ||
a44ae1a9 | 226 | static int lxc_terminal_write_log_file(struct lxc_terminal *terminal, char *buf, |
8903fb08 | 227 | int bytes_read) |
861813e5 CB |
228 | { |
229 | int ret; | |
861813e5 | 230 | struct stat st; |
8903fb08 | 231 | int64_t space_left = -1; |
861813e5 | 232 | |
99a04585 | 233 | if (terminal->log_fd < 0) |
861813e5 CB |
234 | return 0; |
235 | ||
236 | /* A log size <= 0 means that there's no limit on the size of the log | |
237 | * file at which point we simply ignore whether the log is supposed to | |
238 | * be rotated or not. | |
239 | */ | |
99a04585 CB |
240 | if (terminal->log_size <= 0) |
241 | return lxc_write_nointr(terminal->log_fd, buf, bytes_read); | |
861813e5 CB |
242 | |
243 | /* Get current size of the log file. */ | |
99a04585 | 244 | ret = fstat(terminal->log_fd, &st); |
861813e5 | 245 | if (ret < 0) { |
99a04585 | 246 | SYSERROR("Failed to stat the terminal log file descriptor"); |
861813e5 CB |
247 | return -1; |
248 | } | |
249 | ||
250 | /* handle non-regular files */ | |
251 | if ((st.st_mode & S_IFMT) != S_IFREG) { | |
252 | /* This isn't a regular file. so rotating the file seems a | |
253 | * dangerous thing to do, size limits are also very | |
254 | * questionable. Let's not risk anything and tell the user that | |
f48e8071 | 255 | * they're requesting us to do weird stuff. |
861813e5 | 256 | */ |
99a04585 | 257 | if (terminal->log_rotate > 0 || terminal->log_size > 0) |
861813e5 CB |
258 | return -EINVAL; |
259 | ||
260 | /* I mean, sure log wherever you want to. */ | |
99a04585 | 261 | return lxc_write_nointr(terminal->log_fd, buf, bytes_read); |
861813e5 CB |
262 | } |
263 | ||
99a04585 | 264 | space_left = terminal->log_size - st.st_size; |
861813e5 CB |
265 | |
266 | /* User doesn't want to rotate the log file and there's no more space | |
267 | * left so simply truncate it. | |
268 | */ | |
99a04585 CB |
269 | if (space_left <= 0 && terminal->log_rotate <= 0) { |
270 | ret = lxc_terminal_truncate_log_file(terminal); | |
861813e5 CB |
271 | if (ret < 0) |
272 | return ret; | |
273 | ||
8703bf5b | 274 | if ((uint64_t)bytes_read <= terminal->log_size) |
99a04585 | 275 | return lxc_write_nointr(terminal->log_fd, buf, bytes_read); |
861813e5 CB |
276 | |
277 | /* Write as much as we can into the buffer and loose the rest. */ | |
99a04585 | 278 | return lxc_write_nointr(terminal->log_fd, buf, terminal->log_size); |
861813e5 CB |
279 | } |
280 | ||
281 | /* There's enough space left. */ | |
282 | if (bytes_read <= space_left) | |
99a04585 | 283 | return lxc_write_nointr(terminal->log_fd, buf, bytes_read); |
861813e5 CB |
284 | |
285 | /* There's not enough space left but at least write as much as we can | |
286 | * into the old log file. | |
287 | */ | |
99a04585 | 288 | ret = lxc_write_nointr(terminal->log_fd, buf, space_left); |
861813e5 CB |
289 | if (ret < 0) |
290 | return -1; | |
291 | ||
292 | /* Calculate how many bytes we still need to write. */ | |
293 | bytes_read -= space_left; | |
294 | ||
89962c6c | 295 | /* There'd be more to write but we aren't instructed to rotate the log |
861813e5 CB |
296 | * file so simply return. There's no error on our side here. |
297 | */ | |
99a04585 | 298 | if (terminal->log_rotate > 0) |
468724d3 | 299 | ret = lxc_terminal_rotate_log_file(terminal); |
861813e5 | 300 | else |
99a04585 | 301 | ret = lxc_terminal_truncate_log_file(terminal); |
861813e5 CB |
302 | if (ret < 0) |
303 | return ret; | |
304 | ||
8703bf5b | 305 | if (terminal->log_size < (uint64_t)bytes_read) { |
861813e5 CB |
306 | /* Well, this is unfortunate because it means that there is more |
307 | * to write than the user has granted us space. There are | |
308 | * multiple ways to handle this but let's use the simplest one: | |
309 | * write as much as we can, tell the user that there was more | |
310 | * stuff to write and move on. | |
311 | * Note that this scenario shouldn't actually happen with the | |
99a04585 | 312 | * standard pty-based terminal that LXC allocates since it will |
861813e5 CB |
313 | * be switched into raw mode. In raw mode only 1 byte at a time |
314 | * should be read and written. | |
315 | */ | |
99a04585 CB |
316 | WARN("Size of terminal log file is smaller than the bytes to write"); |
317 | ret = lxc_write_nointr(terminal->log_fd, buf, terminal->log_size); | |
861813e5 CB |
318 | if (ret < 0) |
319 | return -1; | |
320 | bytes_read -= ret; | |
321 | return bytes_read; | |
322 | } | |
323 | ||
324 | /* Yay, we made it. */ | |
99a04585 | 325 | ret = lxc_write_nointr(terminal->log_fd, buf, bytes_read); |
861813e5 CB |
326 | if (ret < 0) |
327 | return -1; | |
328 | bytes_read -= ret; | |
329 | return bytes_read; | |
330 | } | |
331 | ||
543d2f83 | 332 | static int lxc_terminal_ptx_io(struct lxc_terminal *terminal) |
b5159817 | 333 | { |
de708fb7 | 334 | char buf[LXC_TERMINAL_BUFFER_SIZE]; |
732375f5 | 335 | int r, w, w_log, w_rbuf; |
e0dc0de7 | 336 | |
543d2f83 CB |
337 | w = r = lxc_read_nointr(terminal->ptx, buf, sizeof(buf)); |
338 | if (r <= 0) | |
339 | return -1; | |
c06a0555 | 340 | |
543d2f83 CB |
341 | w_rbuf = w_log = 0; |
342 | /* write to peer first */ | |
343 | if (terminal->peer >= 0) | |
344 | w = lxc_write_nointr(terminal->peer, buf, r); | |
63376d7d | 345 | |
543d2f83 CB |
346 | /* write to terminal ringbuffer */ |
347 | if (terminal->buffer_size > 0) | |
348 | w_rbuf = lxc_ringbuf_write(&terminal->ringbuf, buf, r); | |
b5159817 | 349 | |
543d2f83 CB |
350 | /* write to terminal log */ |
351 | if (terminal->log_fd >= 0) | |
352 | w_log = lxc_terminal_write_log_file(terminal, buf, r); | |
63376d7d | 353 | |
b5159817 | 354 | if (w != r) |
de708fb7 | 355 | WARN("Short write on terminal r:%d != w:%d", r, w); |
732375f5 | 356 | |
7874d81a | 357 | if (w_rbuf < 0) { |
358 | errno = -w_rbuf; | |
359 | SYSTRACE("Failed to write %d bytes to terminal ringbuffer", r); | |
360 | } | |
732375f5 CB |
361 | |
362 | if (w_log < 0) | |
de708fb7 | 363 | TRACE("Failed to write %d bytes to terminal log", r); |
0d4137cc | 364 | |
543d2f83 CB |
365 | return 0; |
366 | } | |
367 | ||
368 | static int lxc_terminal_peer_io(struct lxc_terminal *terminal) | |
369 | { | |
370 | char buf[LXC_TERMINAL_BUFFER_SIZE]; | |
371 | int r, w; | |
372 | ||
373 | w = r = lxc_read_nointr(terminal->peer, buf, sizeof(buf)); | |
374 | if (r <= 0) | |
375 | return -1; | |
376 | ||
377 | w = lxc_write_nointr(terminal->ptx, buf, r); | |
378 | if (w != r) | |
379 | WARN("Short write on terminal r:%d != w:%d", r, w); | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | static int lxc_terminal_ptx_io_handler(int fd, uint32_t events, void *data, | |
385 | struct lxc_async_descr *descr) | |
386 | { | |
387 | struct lxc_terminal *terminal = data; | |
388 | int ret; | |
389 | ||
390 | ret = lxc_terminal_ptx_io(data); | |
391 | if (ret < 0) | |
392 | return log_info(LXC_MAINLOOP_CLOSE, | |
393 | "Terminal client on fd %d has exited", | |
394 | terminal->ptx); | |
395 | ||
396 | return LXC_MAINLOOP_CONTINUE; | |
397 | } | |
398 | ||
399 | static int lxc_terminal_peer_io_handler(int fd, uint32_t events, void *data, | |
400 | struct lxc_async_descr *descr) | |
401 | { | |
402 | struct lxc_terminal *terminal = data; | |
403 | int ret; | |
404 | ||
405 | ret = lxc_terminal_peer_io(data); | |
406 | if (ret < 0) | |
407 | return log_info(LXC_MAINLOOP_CLOSE, | |
408 | "Terminal client on fd %d has exited", | |
409 | terminal->peer); | |
410 | ||
2b8bf299 | 411 | return LXC_MAINLOOP_CONTINUE; |
b5159817 DE |
412 | } |
413 | ||
dcad02f8 | 414 | static int lxc_terminal_mainloop_add_peer(struct lxc_terminal *terminal) |
b5159817 | 415 | { |
a529bc25 CB |
416 | int ret; |
417 | ||
2083d59d CB |
418 | if (terminal->peer >= 0) { |
419 | ret = lxc_mainloop_add_handler(terminal->descr, terminal->peer, | |
543d2f83 CB |
420 | lxc_terminal_peer_io_handler, |
421 | default_cleanup_handler, | |
422 | terminal, "lxc_terminal_peer_io_handler"); | |
a529bc25 | 423 | if (ret < 0) { |
2083d59d | 424 | WARN("Failed to add terminal peer handler to mainloop"); |
a529bc25 CB |
425 | return -1; |
426 | } | |
63376d7d DL |
427 | } |
428 | ||
2083d59d | 429 | if (!terminal->tty_state || terminal->tty_state->sigfd < 0) |
a529bc25 CB |
430 | return 0; |
431 | ||
543d2f83 CB |
432 | ret = lxc_mainloop_add_handler(terminal->descr, |
433 | terminal->tty_state->sigfd, | |
434 | lxc_terminal_signalfd_cb, | |
435 | default_cleanup_handler, | |
436 | terminal->tty_state, | |
437 | "lxc_terminal_signalfd_cb"); | |
a529bc25 CB |
438 | if (ret < 0) { |
439 | WARN("Failed to add signal handler to mainloop"); | |
440 | return -1; | |
b5159817 | 441 | } |
a529bc25 CB |
442 | |
443 | return 0; | |
b5159817 DE |
444 | } |
445 | ||
3298b37d | 446 | int lxc_terminal_mainloop_add(struct lxc_async_descr *descr, |
ea5b3c23 | 447 | struct lxc_terminal *terminal) |
b5159817 | 448 | { |
a529bc25 | 449 | int ret; |
b5159817 | 450 | |
36a94ce8 | 451 | if (terminal->ptx < 0) { |
2083d59d | 452 | INFO("Terminal is not initialized"); |
b5159817 | 453 | return 0; |
596a818d DE |
454 | } |
455 | ||
36a94ce8 | 456 | ret = lxc_mainloop_add_handler(descr, terminal->ptx, |
543d2f83 CB |
457 | lxc_terminal_ptx_io_handler, |
458 | default_cleanup_handler, | |
459 | terminal, "lxc_terminal_ptx_io_handler"); | |
30a33fbd | 460 | if (ret < 0) { |
543d2f83 | 461 | ERROR("Failed to add handler for terminal ptx fd %d to mainloop", terminal->ptx); |
b5159817 | 462 | return -1; |
28a4b0e5 DL |
463 | } |
464 | ||
30a33fbd | 465 | /* We cache the descr so that we can add an fd to it when someone |
c1ee47cd | 466 | * does attach to it in lxc_terminal_allocate(). |
b5159817 | 467 | */ |
2083d59d | 468 | terminal->descr = descr; |
cd453b38 | 469 | |
ea5b3c23 | 470 | return lxc_terminal_mainloop_add_peer(terminal); |
b5159817 | 471 | } |
28a4b0e5 | 472 | |
0d4137cc | 473 | int lxc_setup_tios(int fd, struct termios *oldtios) |
b5159817 | 474 | { |
e4953e62 | 475 | int ret; |
b5159817 | 476 | struct termios newtios; |
e0dc0de7 | 477 | |
b5159817 | 478 | if (!isatty(fd)) { |
8332a09c | 479 | ERROR("File descriptor %d does not refer to a terminal", fd); |
b5159817 | 480 | return -1; |
e0dc0de7 DL |
481 | } |
482 | ||
e4953e62 CB |
483 | /* Get current termios. */ |
484 | ret = tcgetattr(fd, oldtios); | |
485 | if (ret < 0) { | |
486 | SYSERROR("Failed to get current terminal settings"); | |
b5159817 | 487 | return -1; |
e0dc0de7 DL |
488 | } |
489 | ||
4dc96430 TJ |
490 | /* ensure we don't end up in an endless loop: |
491 | * The kernel might fire SIGTTOU while an | |
492 | * ioctl() in tcsetattr() is executed. When the ioctl() | |
493 | * is resumed and retries, the signal handler interrupts it again. | |
494 | */ | |
495 | signal (SIGTTIN, SIG_IGN); | |
496 | signal (SIGTTOU, SIG_IGN); | |
497 | ||
b5159817 | 498 | newtios = *oldtios; |
e0dc0de7 | 499 | |
a7c97a40 CB |
500 | /* We use the same settings that ssh does. */ |
501 | newtios.c_iflag |= IGNPAR; | |
502 | newtios.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF); | |
503 | #ifdef IUCLC | |
504 | newtios.c_iflag &= ~IUCLC; | |
505 | #endif | |
4dc96430 | 506 | newtios.c_lflag &= ~(TOSTOP | ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL); |
a7c97a40 CB |
507 | #ifdef IEXTEN |
508 | newtios.c_lflag &= ~IEXTEN; | |
509 | #endif | |
90275474 | 510 | newtios.c_oflag |= ONLCR; |
300ec717 | 511 | newtios.c_oflag |= OPOST; |
b5159817 DE |
512 | newtios.c_cc[VMIN] = 1; |
513 | newtios.c_cc[VTIME] = 0; | |
e0dc0de7 | 514 | |
a7c97a40 | 515 | /* Set new attributes. */ |
e4953e62 CB |
516 | ret = tcsetattr(fd, TCSAFLUSH, &newtios); |
517 | if (ret < 0) { | |
518 | ERROR("Failed to set new terminal settings"); | |
b5159817 | 519 | return -1; |
e0dc0de7 DL |
520 | } |
521 | ||
63376d7d | 522 | return 0; |
b5159817 | 523 | } |
e0dc0de7 | 524 | |
dcad02f8 | 525 | static void lxc_terminal_peer_proxy_free(struct lxc_terminal *terminal) |
b5159817 | 526 | { |
28327a43 | 527 | lxc_terminal_signal_fini(terminal); |
e788f4ac | 528 | |
36a94ce8 CB |
529 | close(terminal->proxy.ptx); |
530 | terminal->proxy.ptx = -1; | |
e788f4ac | 531 | |
41808e20 CB |
532 | close(terminal->proxy.pty); |
533 | terminal->proxy.pty = -1; | |
e788f4ac | 534 | |
fb87aa6a | 535 | terminal->proxy.busy = -1; |
e788f4ac | 536 | |
fb87aa6a | 537 | terminal->proxy.name[0] = '\0'; |
e788f4ac | 538 | |
2083d59d | 539 | terminal->peer = -1; |
b5159817 | 540 | } |
596a818d | 541 | |
60dd8ef4 CB |
542 | static int lxc_terminal_peer_proxy_alloc(struct lxc_terminal *terminal, |
543 | int sockfd) | |
b5159817 | 544 | { |
60dd8ef4 | 545 | int ret; |
b5159817 | 546 | struct termios oldtermio; |
5b55021f | 547 | struct lxc_terminal_state *ts; |
b5159817 | 548 | |
36a94ce8 | 549 | if (terminal->ptx < 0) { |
2083d59d | 550 | ERROR("Terminal not set up"); |
b5159817 DE |
551 | return -1; |
552 | } | |
60dd8ef4 | 553 | |
fb87aa6a | 554 | if (terminal->proxy.busy != -1 || terminal->peer != -1) { |
2083d59d | 555 | NOTICE("Terminal already in use"); |
b5159817 DE |
556 | return -1; |
557 | } | |
60dd8ef4 | 558 | |
2083d59d | 559 | if (terminal->tty_state) { |
60dd8ef4 | 560 | ERROR("Terminal has already been initialized"); |
b5159817 | 561 | return -1; |
596a818d DE |
562 | } |
563 | ||
d712f9e8 | 564 | /* This is the proxy terminal that will be given to the client, and |
36a94ce8 | 565 | * that the real terminal ptx will send to / recv from. |
b5159817 | 566 | */ |
41808e20 | 567 | ret = openpty(&terminal->proxy.ptx, &terminal->proxy.pty, NULL, |
3f15bdd9 | 568 | NULL, NULL); |
60dd8ef4 CB |
569 | if (ret < 0) { |
570 | SYSERROR("Failed to open proxy terminal"); | |
b5159817 DE |
571 | return -1; |
572 | } | |
596a818d | 573 | |
41808e20 | 574 | ret = ttyname_r(terminal->proxy.pty, terminal->proxy.name, |
3f15bdd9 CB |
575 | sizeof(terminal->proxy.name)); |
576 | if (ret < 0) { | |
41808e20 | 577 | SYSERROR("Failed to retrieve name of proxy terminal pty"); |
3f15bdd9 CB |
578 | goto on_error; |
579 | } | |
580 | ||
36a94ce8 | 581 | ret = fd_cloexec(terminal->proxy.ptx, true); |
408c18a1 | 582 | if (ret < 0) { |
36a94ce8 | 583 | SYSERROR("Failed to set FD_CLOEXEC flag on proxy terminal ptx"); |
408c18a1 CB |
584 | goto on_error; |
585 | } | |
586 | ||
41808e20 | 587 | ret = fd_cloexec(terminal->proxy.pty, true); |
408c18a1 | 588 | if (ret < 0) { |
41808e20 | 589 | SYSERROR("Failed to set FD_CLOEXEC flag on proxy terminal pty"); |
408c18a1 CB |
590 | goto on_error; |
591 | } | |
592 | ||
41808e20 | 593 | ret = lxc_setup_tios(terminal->proxy.pty, &oldtermio); |
60dd8ef4 CB |
594 | if (ret < 0) |
595 | goto on_error; | |
b5159817 | 596 | |
36a94ce8 | 597 | ts = lxc_terminal_signal_init(terminal->proxy.ptx, terminal->ptx); |
b5159817 | 598 | if (!ts) |
60dd8ef4 | 599 | goto on_error; |
b5159817 | 600 | |
2083d59d | 601 | terminal->tty_state = ts; |
41808e20 | 602 | terminal->peer = terminal->proxy.pty; |
fb87aa6a | 603 | terminal->proxy.busy = sockfd; |
2083d59d | 604 | ret = lxc_terminal_mainloop_add_peer(terminal); |
a529bc25 | 605 | if (ret < 0) |
60dd8ef4 | 606 | goto on_error; |
b5159817 | 607 | |
41808e20 CB |
608 | NOTICE("Opened proxy terminal with ptx fd %d and pty fd %d", |
609 | terminal->proxy.ptx, terminal->proxy.pty); | |
b5159817 DE |
610 | return 0; |
611 | ||
60dd8ef4 | 612 | on_error: |
2083d59d | 613 | lxc_terminal_peer_proxy_free(terminal); |
63376d7d DL |
614 | return -1; |
615 | } | |
616 | ||
c1ee47cd | 617 | int lxc_terminal_allocate(struct lxc_conf *conf, int sockfd, int *ttyreq) |
b5159817 | 618 | { |
8703bf5b | 619 | size_t ttynum; |
36a94ce8 | 620 | int ptxfd = -1; |
0e4be3cf | 621 | struct lxc_tty_info *ttys = &conf->ttys; |
dcad02f8 | 622 | struct lxc_terminal *terminal = &conf->console; |
b5159817 | 623 | |
b5159817 | 624 | if (*ttyreq == 0) { |
12c2eaaa CB |
625 | int ret; |
626 | ||
627 | ret = lxc_terminal_peer_proxy_alloc(terminal, sockfd); | |
628 | if (ret < 0) | |
b5159817 | 629 | goto out; |
12c2eaaa | 630 | |
36a94ce8 | 631 | ptxfd = terminal->proxy.ptx; |
b5159817 DE |
632 | goto out; |
633 | } | |
634 | ||
635 | if (*ttyreq > 0) { | |
8703bf5b | 636 | if ((size_t)*ttyreq > ttys->max) |
b5159817 DE |
637 | goto out; |
638 | ||
730aaf46 | 639 | if (ttys->tty[*ttyreq - 1].busy >= 0) |
b5159817 DE |
640 | goto out; |
641 | ||
12c2eaaa | 642 | /* The requested tty is available. */ |
b5159817 DE |
643 | ttynum = *ttyreq; |
644 | goto out_tty; | |
645 | } | |
646 | ||
12c2eaaa | 647 | /* Search for next available tty, fixup index tty1 => [0]. */ |
730aaf46 | 648 | for (ttynum = 1; ttynum <= ttys->max && ttys->tty[ttynum - 1].busy >= 0; ttynum++) { |
0d4137cc | 649 | ; |
12c2eaaa | 650 | } |
b5159817 | 651 | |
12c2eaaa | 652 | /* We didn't find any available slot for tty. */ |
885766f5 | 653 | if (ttynum > ttys->max) |
b5159817 DE |
654 | goto out; |
655 | ||
8703bf5b | 656 | *ttyreq = (int)ttynum; |
b5159817 DE |
657 | |
658 | out_tty: | |
0e4be3cf | 659 | ttys->tty[ttynum - 1].busy = sockfd; |
36a94ce8 | 660 | ptxfd = ttys->tty[ttynum - 1].ptx; |
12c2eaaa | 661 | |
b5159817 | 662 | out: |
36a94ce8 | 663 | return ptxfd; |
b5159817 DE |
664 | } |
665 | ||
3dfe6f8d | 666 | void lxc_terminal_free(struct lxc_conf *conf, int fd) |
63376d7d | 667 | { |
0e4be3cf | 668 | struct lxc_tty_info *ttys = &conf->ttys; |
dcad02f8 | 669 | struct lxc_terminal *terminal = &conf->console; |
b5159817 | 670 | |
8703bf5b | 671 | for (size_t i = 0; i < ttys->max; i++) |
0e4be3cf | 672 | if (ttys->tty[i].busy == fd) |
730aaf46 | 673 | ttys->tty[i].busy = -1; |
b5159817 | 674 | |
1b5e93c4 CB |
675 | if (terminal->proxy.busy != fd) |
676 | return; | |
677 | ||
41808e20 | 678 | lxc_mainloop_del_handler(terminal->descr, terminal->proxy.pty); |
1b5e93c4 | 679 | lxc_terminal_peer_proxy_free(terminal); |
b5159817 DE |
680 | } |
681 | ||
dcad02f8 | 682 | static int lxc_terminal_peer_default(struct lxc_terminal *terminal) |
b5159817 | 683 | { |
5b55021f | 684 | struct lxc_terminal_state *ts; |
46768cce | 685 | const char *path; |
467c7ff3 | 686 | int ret = 0; |
b5159817 | 687 | |
46768cce CB |
688 | if (terminal->path) |
689 | path = terminal->path; | |
690 | else | |
691 | path = "/dev/tty"; | |
b5159817 | 692 | |
2083d59d CB |
693 | terminal->peer = lxc_unpriv(open(path, O_RDWR | O_CLOEXEC)); |
694 | if (terminal->peer < 0) { | |
46768cce CB |
695 | if (!terminal->path) { |
696 | errno = ENODEV; | |
7874d81a | 697 | SYSDEBUG("The process does not have a controlling terminal"); |
46768cce CB |
698 | goto on_succes; |
699 | } | |
700 | ||
6d1400b5 | 701 | SYSERROR("Failed to open proxy terminal \"%s\"", path); |
467c7ff3 CB |
702 | return -ENOTTY; |
703 | } | |
49cd0656 | 704 | DEBUG("Using terminal \"%s\" as proxy", path); |
b5159817 | 705 | |
2083d59d | 706 | if (!isatty(terminal->peer)) { |
49cd0656 CB |
707 | ERROR("File descriptor for \"%s\" does not refer to a terminal", path); |
708 | goto on_error_free_tios; | |
467c7ff3 | 709 | } |
b5159817 | 710 | |
36a94ce8 | 711 | ts = lxc_terminal_signal_init(terminal->peer, terminal->ptx); |
2083d59d | 712 | terminal->tty_state = ts; |
341c2aed | 713 | if (!ts) { |
0519b5cc | 714 | WARN("Failed to install signal handler"); |
49cd0656 | 715 | goto on_error_free_tios; |
341c2aed | 716 | } |
b5159817 | 717 | |
36a94ce8 | 718 | lxc_terminal_winsz(terminal->peer, terminal->ptx); |
b5159817 | 719 | |
2083d59d | 720 | terminal->tios = malloc(sizeof(*terminal->tios)); |
49cd0656 CB |
721 | if (!terminal->tios) |
722 | goto on_error_free_tios; | |
b5159817 | 723 | |
49cd0656 CB |
724 | ret = lxc_setup_tios(terminal->peer, terminal->tios); |
725 | if (ret < 0) | |
726 | goto on_error_close_peer; | |
467c7ff3 | 727 | else |
49cd0656 | 728 | goto on_succes; |
b5159817 | 729 | |
49cd0656 | 730 | on_error_free_tios: |
2083d59d CB |
731 | free(terminal->tios); |
732 | terminal->tios = NULL; | |
467c7ff3 | 733 | |
49cd0656 | 734 | on_error_close_peer: |
2083d59d CB |
735 | close(terminal->peer); |
736 | terminal->peer = -1; | |
467c7ff3 CB |
737 | ret = -ENOTTY; |
738 | ||
49cd0656 | 739 | on_succes: |
467c7ff3 | 740 | return ret; |
b5159817 DE |
741 | } |
742 | ||
dcad02f8 | 743 | int lxc_terminal_write_ringbuffer(struct lxc_terminal *terminal) |
39c6cdb7 CB |
744 | { |
745 | char *r_addr; | |
746 | ssize_t ret; | |
747 | uint64_t used; | |
2083d59d | 748 | struct lxc_ringbuf *buf = &terminal->ringbuf; |
39c6cdb7 CB |
749 | |
750 | /* There's not log file where we can dump the ringbuffer to. */ | |
2083d59d | 751 | if (terminal->log_fd < 0) |
39c6cdb7 CB |
752 | return 0; |
753 | ||
39c6cdb7 CB |
754 | used = lxc_ringbuf_used(buf); |
755 | if (used == 0) | |
756 | return 0; | |
757 | ||
2083d59d | 758 | ret = lxc_terminal_truncate_log_file(terminal); |
39c6cdb7 CB |
759 | if (ret < 0) |
760 | return ret; | |
761 | ||
762 | /* Write as much as we can without exceeding the limit. */ | |
2083d59d CB |
763 | if (terminal->log_size < used) |
764 | used = terminal->log_size; | |
39c6cdb7 CB |
765 | |
766 | r_addr = lxc_ringbuf_get_read_addr(buf); | |
2083d59d | 767 | ret = lxc_write_nointr(terminal->log_fd, r_addr, used); |
39c6cdb7 CB |
768 | if (ret < 0) |
769 | return -EIO; | |
770 | ||
771 | return 0; | |
772 | } | |
773 | ||
dcad02f8 | 774 | void lxc_terminal_delete(struct lxc_terminal *terminal) |
b5159817 | 775 | { |
69629c82 CB |
776 | int ret; |
777 | ||
2083d59d | 778 | ret = lxc_terminal_write_ringbuffer(terminal); |
39c6cdb7 | 779 | if (ret < 0) |
2083d59d | 780 | WARN("Failed to write terminal log to disk"); |
39c6cdb7 | 781 | |
2083d59d CB |
782 | if (terminal->tios && terminal->peer >= 0) { |
783 | ret = tcsetattr(terminal->peer, TCSAFLUSH, terminal->tios); | |
69629c82 | 784 | if (ret < 0) |
a24c5678 | 785 | SYSWARN("Failed to set old terminal settings"); |
69629c82 | 786 | } |
2083d59d CB |
787 | free(terminal->tios); |
788 | terminal->tios = NULL; | |
596a818d | 789 | |
2083d59d CB |
790 | if (terminal->peer >= 0) |
791 | close(terminal->peer); | |
792 | terminal->peer = -1; | |
bc9724f7 | 793 | |
36a94ce8 CB |
794 | if (terminal->ptx >= 0) |
795 | close(terminal->ptx); | |
796 | terminal->ptx = -1; | |
bc9724f7 | 797 | |
41808e20 CB |
798 | if (terminal->pty >= 0) |
799 | close(terminal->pty); | |
800 | terminal->pty = -1; | |
bc9724f7 | 801 | |
d926c261 CB |
802 | terminal->pty_nr = -1; |
803 | ||
2083d59d CB |
804 | if (terminal->log_fd >= 0) |
805 | close(terminal->log_fd); | |
806 | terminal->log_fd = -1; | |
63376d7d DL |
807 | } |
808 | ||
3b988b33 CB |
809 | /** |
810 | * Note that this function needs to run before the mainloop starts. Since we | |
36a94ce8 | 811 | * register a handler for the terminal's ptxfd when we create the mainloop |
2083d59d | 812 | * the terminal handler needs to see an allocated ringbuffer. |
3b988b33 | 813 | */ |
dcad02f8 | 814 | static int lxc_terminal_create_ringbuf(struct lxc_terminal *terminal) |
3b988b33 CB |
815 | { |
816 | int ret; | |
2083d59d CB |
817 | struct lxc_ringbuf *buf = &terminal->ringbuf; |
818 | uint64_t size = terminal->buffer_size; | |
3b988b33 CB |
819 | |
820 | /* no ringbuffer previously allocated and no ringbuffer requested */ | |
821 | if (!buf->addr && size <= 0) | |
822 | return 0; | |
823 | ||
824 | /* ringbuffer allocated but no new ringbuffer requested */ | |
825 | if (buf->addr && size <= 0) { | |
826 | lxc_ringbuf_release(buf); | |
827 | buf->addr = NULL; | |
828 | buf->r_off = 0; | |
829 | buf->w_off = 0; | |
830 | buf->size = 0; | |
2083d59d | 831 | TRACE("Deallocated terminal ringbuffer"); |
3b988b33 CB |
832 | return 0; |
833 | } | |
834 | ||
835 | if (size <= 0) | |
836 | return 0; | |
837 | ||
838 | /* check wether the requested size for the ringbuffer has changed */ | |
839 | if (buf->addr && buf->size != size) { | |
2083d59d CB |
840 | TRACE("Terminal ringbuffer size changed from %" PRIu64 |
841 | " to %" PRIu64 " bytes. Deallocating terminal ringbuffer", | |
3b988b33 CB |
842 | buf->size, size); |
843 | lxc_ringbuf_release(buf); | |
844 | } | |
845 | ||
846 | ret = lxc_ringbuf_create(buf, size); | |
847 | if (ret < 0) { | |
2083d59d | 848 | ERROR("Failed to setup %" PRIu64 " byte terminal ringbuffer", size); |
3b988b33 CB |
849 | return -1; |
850 | } | |
851 | ||
2083d59d | 852 | TRACE("Allocated %" PRIu64 " byte terminal ringbuffer", size); |
3b988b33 CB |
853 | return 0; |
854 | } | |
855 | ||
a0309168 | 856 | /** |
2083d59d CB |
857 | * This is the terminal log file. Please note that the terminal log file is |
858 | * (implementation wise not content wise) independent of the terminal ringbuffer. | |
a0309168 | 859 | */ |
dcad02f8 | 860 | int lxc_terminal_create_log_file(struct lxc_terminal *terminal) |
a0309168 | 861 | { |
2083d59d | 862 | if (!terminal->log_path) |
a0309168 CB |
863 | return 0; |
864 | ||
2083d59d CB |
865 | terminal->log_fd = lxc_unpriv(open(terminal->log_path, O_CLOEXEC | O_RDWR | O_CREAT | O_APPEND, 0600)); |
866 | if (terminal->log_fd < 0) { | |
867 | SYSERROR("Failed to open terminal log file \"%s\"", terminal->log_path); | |
a0309168 CB |
868 | return -1; |
869 | } | |
870 | ||
2083d59d | 871 | DEBUG("Using \"%s\" as terminal log file", terminal->log_path); |
a0309168 CB |
872 | return 0; |
873 | } | |
874 | ||
8ea93a0f CB |
875 | static int lxc_terminal_map_ids(struct lxc_conf *c, struct lxc_terminal *terminal) |
876 | { | |
877 | int ret; | |
878 | ||
0589d744 | 879 | if (list_empty(&c->id_map)) |
8ea93a0f CB |
880 | return 0; |
881 | ||
882 | if (is_empty_string(terminal->name) && terminal->pty < 0) | |
883 | return 0; | |
884 | ||
885 | if (terminal->pty >= 0) | |
886 | ret = userns_exec_mapped_root(NULL, terminal->pty, c); | |
887 | else | |
888 | ret = userns_exec_mapped_root(terminal->name, -EBADF, c); | |
889 | if (ret < 0) | |
890 | return log_error(-1, "Failed to chown terminal %d(%s)", terminal->pty, | |
891 | !is_empty_string(terminal->name) ? terminal->name : "(null)"); | |
892 | ||
893 | TRACE("Chowned terminal %d(%s)", terminal->pty, | |
894 | !is_empty_string(terminal->name) ? terminal->name : "(null)"); | |
895 | ||
896 | return 0; | |
897 | } | |
898 | ||
899 | static int lxc_terminal_create_foreign(struct lxc_conf *conf, struct lxc_terminal *terminal) | |
63376d7d | 900 | { |
8ded9244 | 901 | int ret; |
b5159817 | 902 | |
41808e20 | 903 | ret = openpty(&terminal->ptx, &terminal->pty, NULL, NULL, NULL); |
467c7ff3 | 904 | if (ret < 0) { |
8ded9244 | 905 | SYSERROR("Failed to open terminal"); |
b5159817 DE |
906 | return -1; |
907 | } | |
908 | ||
8ea93a0f CB |
909 | ret = lxc_terminal_map_ids(conf, terminal); |
910 | if (ret < 0) { | |
911 | SYSERROR("Failed to change ownership of terminal multiplexer device"); | |
912 | goto err; | |
913 | } | |
914 | ||
41808e20 | 915 | ret = ttyname_r(terminal->pty, terminal->name, sizeof(terminal->name)); |
3f15bdd9 | 916 | if (ret < 0) { |
41808e20 | 917 | SYSERROR("Failed to retrieve name of terminal pty"); |
3f15bdd9 CB |
918 | goto err; |
919 | } | |
920 | ||
36a94ce8 | 921 | ret = fd_cloexec(terminal->ptx, true); |
69629c82 | 922 | if (ret < 0) { |
36a94ce8 | 923 | SYSERROR("Failed to set FD_CLOEXEC flag on terminal ptx"); |
b5159817 DE |
924 | goto err; |
925 | } | |
926 | ||
41808e20 | 927 | ret = fd_cloexec(terminal->pty, true); |
69629c82 | 928 | if (ret < 0) { |
41808e20 | 929 | SYSERROR("Failed to set FD_CLOEXEC flag on terminal pty"); |
b5159817 DE |
930 | goto err; |
931 | } | |
932 | ||
2083d59d | 933 | ret = lxc_terminal_peer_default(terminal); |
467c7ff3 | 934 | if (ret < 0) { |
8ded9244 | 935 | ERROR("Failed to allocate proxy terminal"); |
467c7ff3 CB |
936 | goto err; |
937 | } | |
b5159817 | 938 | |
5777fe90 CB |
939 | return 0; |
940 | ||
941 | err: | |
2083d59d | 942 | lxc_terminal_delete(terminal); |
5777fe90 CB |
943 | return -ENODEV; |
944 | } | |
945 | ||
18129d94 CB |
946 | int lxc_devpts_terminal(int devpts_fd, int *ret_ptx, int *ret_pty, |
947 | int *ret_pty_nr, bool require_tiocgptpeer) | |
f797f05e | 948 | { |
803839b8 CB |
949 | __do_close int fd_devpts = -EBADF, fd_ptx = -EBADF, |
950 | fd_opath_pty = -EBADF, fd_pty = -EBADF; | |
cb01e311 | 951 | int pty_nr = -1; |
f797f05e CB |
952 | int ret; |
953 | ||
803839b8 CB |
954 | /* |
955 | * When we aren't told what devpts instance to allocate from we assume | |
956 | * it is the one in the caller's mount namespace. | |
957 | * This poses a slight complication, a lot of distros will change | |
958 | * permissions on /dev/ptmx so it can be opened by unprivileged users | |
959 | * but will not change permissions on /dev/pts/ptmx itself. In | |
960 | * addition, /dev/ptmx can either be a symlink, a bind-mount, or a | |
961 | * separate device node. So we need to allow for fairly lax lookup. | |
962 | */ | |
9f77617b | 963 | if (devpts_fd < 0) |
803839b8 CB |
964 | fd_ptx = open_at(-EBADF, "/dev/ptmx", PROTECT_OPEN_RW & ~O_NOFOLLOW, |
965 | PROTECT_LOOKUP_ABSOLUTE_XDEV_SYMLINKS, 0); | |
966 | else | |
967 | fd_ptx = open_beneath(devpts_fd, "ptmx", O_RDWR | O_NOCTTY | O_CLOEXEC); | |
4655bdd1 | 968 | if (fd_ptx < 0) { |
7a316559 CB |
969 | if (errno == ENOSPC) |
970 | return systrace("Exceeded number of allocatable terminals"); | |
971 | ||
972 | return syserror("Failed to open terminal multiplexer device"); | |
973 | } | |
f797f05e | 974 | |
803839b8 CB |
975 | if (devpts_fd < 0) { |
976 | fd_devpts = open_at(-EBADF, "/dev/pts", PROTECT_OPATH_DIRECTORY, | |
977 | PROTECT_LOOKUP_ABSOLUTE_XDEV, 0); | |
978 | if (fd_devpts < 0) | |
979 | return syserror("Failed to open devpts instance"); | |
980 | ||
981 | if (!same_device(fd_devpts, "ptmx", fd_ptx, "")) | |
982 | return syserror("The acquired ptmx devices don't match"); | |
983 | devpts_fd = fd_devpts; | |
984 | } | |
985 | ||
4655bdd1 CB |
986 | ret = unlockpt(fd_ptx); |
987 | if (ret < 0) | |
988 | return syswarn_set(-ENODEV, "Failed to unlock multiplexer device device"); | |
f797f05e | 989 | |
4655bdd1 CB |
990 | fd_pty = ioctl(fd_ptx, TIOCGPTPEER, O_RDWR | O_NOCTTY | O_CLOEXEC); |
991 | if (fd_pty < 0) { | |
f382bcc6 CB |
992 | switch (errno) { |
993 | case ENOTTY: | |
994 | SYSTRACE("Pure fd-based terminal allocation not possible"); | |
995 | break; | |
996 | case ENOSPC: | |
7a316559 | 997 | SYSTRACE("Exceeded number of allocatable terminals"); |
f382bcc6 CB |
998 | break; |
999 | default: | |
1000 | SYSWARN("Failed to allocate new pty device"); | |
64ac925f | 1001 | return -errno; |
f382bcc6 | 1002 | } |
f797f05e | 1003 | |
64ac925f | 1004 | /* The caller tells us that they trust the devpts instance. */ |
18129d94 CB |
1005 | if (require_tiocgptpeer) |
1006 | return ret_errno(ENODEV); | |
8ea93a0f | 1007 | } |
f797f05e | 1008 | |
4655bdd1 CB |
1009 | ret = ioctl(fd_ptx, TIOCGPTN, &pty_nr); |
1010 | if (ret) | |
1011 | return syswarn_set(-ENODEV, "Failed to retrieve name of terminal pty"); | |
cb01e311 | 1012 | |
18129d94 CB |
1013 | if (fd_pty < 0) { |
1014 | /* | |
1015 | * If we end up it means that TIOCGPTPEER isn't supported but | |
1016 | * the caller told us they trust the devpts instance so we use | |
1017 | * the pty nr to open the pty side. | |
1018 | */ | |
1019 | fd_pty = open_at(devpts_fd, fdstr(pty_nr), PROTECT_OPEN_RW, | |
1020 | PROTECT_LOOKUP_ABSOLUTE_XDEV, 0); | |
1021 | if (fd_pty < 0) | |
1022 | return syswarn_set(-ENODEV, "Failed to open terminal pty fd by path %d/%d", | |
1023 | devpts_fd, pty_nr); | |
1024 | } else { | |
1025 | fd_opath_pty = open_at(devpts_fd, fdstr(pty_nr), PROTECT_OPATH_FILE, | |
1026 | PROTECT_LOOKUP_ABSOLUTE_XDEV, 0); | |
1027 | if (fd_opath_pty < 0) | |
1028 | return syswarn_set(-ENODEV, "Failed to open terminal pty fd by path %d/%d", | |
1029 | devpts_fd, pty_nr); | |
1030 | ||
1031 | if (!same_file_lax(fd_pty, fd_opath_pty)) | |
1032 | return syswarn_set(-ENODEV, "Terminal file descriptor changed"); | |
1033 | } | |
4655bdd1 | 1034 | |
4655bdd1 CB |
1035 | *ret_ptx = move_fd(fd_ptx); |
1036 | *ret_pty = move_fd(fd_pty); | |
d926c261 | 1037 | *ret_pty_nr = pty_nr; |
4655bdd1 CB |
1038 | return 0; |
1039 | } | |
1040 | ||
9f77617b CB |
1041 | int lxc_terminal_parent(struct lxc_conf *conf) |
1042 | { | |
9f77617b CB |
1043 | struct lxc_terminal *console = &conf->console; |
1044 | int ret; | |
1045 | ||
1046 | if (!wants_console(&conf->console)) | |
1047 | return 0; | |
1048 | ||
1049 | /* Allocate console from the container's devpts. */ | |
1050 | if (conf->pty_max > 1) | |
1051 | return 0; | |
1052 | ||
1053 | /* Allocate console for the container from the host's devpts. */ | |
803839b8 | 1054 | ret = lxc_devpts_terminal(-EBADF, &console->ptx, &console->pty, |
18129d94 | 1055 | &console->pty_nr, false); |
9f77617b CB |
1056 | if (ret < 0) |
1057 | return syserror("Failed to allocate console"); | |
1058 | ||
1059 | ret = strnprintf(console->name, sizeof(console->name), | |
1060 | "/dev/pts/%d", console->pty_nr); | |
1061 | if (ret < 0) | |
1062 | return syserror("Failed to create console path"); | |
1063 | ||
1064 | return lxc_terminal_map_ids(conf, &conf->console); | |
1065 | } | |
1066 | ||
4655bdd1 | 1067 | static int lxc_terminal_create_native(const char *name, const char *lxcpath, |
4655bdd1 CB |
1068 | struct lxc_terminal *terminal) |
1069 | { | |
1070 | __do_close int devpts_fd = -EBADF; | |
1071 | int ret; | |
1072 | ||
1073 | devpts_fd = lxc_cmd_get_devpts_fd(name, lxcpath); | |
1074 | if (devpts_fd < 0) | |
23cc33cd | 1075 | return sysinfo("Failed to receive devpts fd"); |
4655bdd1 | 1076 | |
4dcf0c43 | 1077 | ret = lxc_devpts_terminal(devpts_fd, &terminal->ptx, &terminal->pty, |
18129d94 | 1078 | &terminal->pty_nr, true); |
4655bdd1 CB |
1079 | if (ret < 0) |
1080 | return ret; | |
cb01e311 | 1081 | |
d926c261 CB |
1082 | ret = strnprintf(terminal->name, sizeof(terminal->name), |
1083 | "/dev/pts/%d", terminal->pty_nr); | |
1084 | if (ret < 0) | |
1085 | return syserror("Failed to create path"); | |
1086 | ||
f797f05e CB |
1087 | ret = lxc_terminal_peer_default(terminal); |
1088 | if (ret < 0) { | |
4655bdd1 CB |
1089 | lxc_terminal_delete(terminal); |
1090 | return syswarn_set(-ENODEV, "Failed to allocate proxy terminal"); | |
f797f05e CB |
1091 | } |
1092 | ||
1093 | return 0; | |
f797f05e CB |
1094 | } |
1095 | ||
550ede0a CB |
1096 | int lxc_terminal_create(const char *name, const char *lxcpath, |
1097 | struct lxc_conf *conf, struct lxc_terminal *terminal) | |
f797f05e | 1098 | { |
4dcf0c43 | 1099 | if (!lxc_terminal_create_native(name, lxcpath, terminal)) |
f797f05e CB |
1100 | return 0; |
1101 | ||
8ea93a0f | 1102 | return lxc_terminal_create_foreign(conf, terminal); |
f797f05e CB |
1103 | } |
1104 | ||
564e31c4 | 1105 | int lxc_terminal_setup(struct lxc_conf *conf) |
5777fe90 CB |
1106 | { |
1107 | int ret; | |
dcad02f8 | 1108 | struct lxc_terminal *terminal = &conf->console; |
5777fe90 | 1109 | |
5ef86378 CB |
1110 | if (terminal->path && strequal(terminal->path, "none")) |
1111 | return log_info(0, "No terminal requested"); | |
5777fe90 | 1112 | |
9f77617b | 1113 | ret = lxc_terminal_peer_default(terminal); |
5777fe90 | 1114 | if (ret < 0) |
9f77617b | 1115 | goto err; |
5777fe90 | 1116 | |
2083d59d | 1117 | ret = lxc_terminal_create_log_file(terminal); |
a0309168 CB |
1118 | if (ret < 0) |
1119 | goto err; | |
1120 | ||
2083d59d | 1121 | ret = lxc_terminal_create_ringbuf(terminal); |
a0309168 CB |
1122 | if (ret < 0) |
1123 | goto err; | |
b5159817 DE |
1124 | |
1125 | return 0; | |
1126 | ||
1127 | err: | |
2083d59d | 1128 | lxc_terminal_delete(terminal); |
69629c82 | 1129 | return -ENODEV; |
b5159817 DE |
1130 | } |
1131 | ||
8ca7b374 CB |
1132 | static bool __terminal_dup2(int duplicate, int original) |
1133 | { | |
1134 | int ret; | |
1135 | ||
1136 | if (!isatty(original)) | |
1137 | return true; | |
1138 | ||
1139 | ret = dup2(duplicate, original); | |
1140 | if (ret < 0) { | |
1141 | SYSERROR("Failed to dup2(%d, %d)", duplicate, original); | |
1142 | return false; | |
1143 | } | |
1144 | ||
1145 | return true; | |
1146 | } | |
1147 | ||
ae6d3913 | 1148 | int lxc_terminal_set_stdfds(int fd) |
0d9acb99 | 1149 | { |
8ca7b374 CB |
1150 | int i; |
1151 | ||
39a78bbe | 1152 | if (fd < 0) |
0d9acb99 | 1153 | return 0; |
b5159817 | 1154 | |
8ca7b374 CB |
1155 | for (i = 0; i < 3; i++) |
1156 | if (!__terminal_dup2(fd, (int[]){STDIN_FILENO, STDOUT_FILENO, | |
1157 | STDERR_FILENO}[i])) | |
39a78bbe | 1158 | return -1; |
39a78bbe | 1159 | |
0d9acb99 DE |
1160 | return 0; |
1161 | } | |
b5159817 | 1162 | |
52f9292f | 1163 | int lxc_terminal_stdin_cb(int fd, uint32_t events, void *cbdata, |
3298b37d | 1164 | struct lxc_async_descr *descr) |
b5159817 | 1165 | { |
15085292 | 1166 | int ret; |
b5159817 | 1167 | char c; |
15085292 | 1168 | struct lxc_terminal_state *ts = cbdata; |
b5159817 | 1169 | |
97bc2422 | 1170 | if (fd != ts->stdinfd) |
a529bc25 | 1171 | return LXC_MAINLOOP_CLOSE; |
97bc2422 | 1172 | |
15085292 CB |
1173 | ret = lxc_read_nointr(ts->stdinfd, &c, 1); |
1174 | if (ret <= 0) | |
a529bc25 | 1175 | return LXC_MAINLOOP_CLOSE; |
63376d7d | 1176 | |
525e2117 | 1177 | if (ts->escape >= 1) { |
2083d59d | 1178 | /* we want to exit the terminal with Ctrl+a q */ |
014d5e1e CB |
1179 | if (c == ts->escape && !ts->saw_escape) { |
1180 | ts->saw_escape = 1; | |
15085292 | 1181 | return LXC_MAINLOOP_CONTINUE; |
014d5e1e | 1182 | } |
5c294060 | 1183 | |
014d5e1e | 1184 | if (c == 'q' && ts->saw_escape) |
a529bc25 | 1185 | return LXC_MAINLOOP_CLOSE; |
014d5e1e CB |
1186 | |
1187 | ts->saw_escape = 0; | |
1188 | } | |
63376d7d | 1189 | |
36a94ce8 | 1190 | ret = lxc_write_nointr(ts->ptxfd, &c, 1); |
15085292 | 1191 | if (ret <= 0) |
a529bc25 | 1192 | return LXC_MAINLOOP_CLOSE; |
b5159817 | 1193 | |
15085292 | 1194 | return LXC_MAINLOOP_CONTINUE; |
63376d7d DL |
1195 | } |
1196 | ||
36a94ce8 | 1197 | int lxc_terminal_ptx_cb(int fd, uint32_t events, void *cbdata, |
3298b37d | 1198 | struct lxc_async_descr *descr) |
63376d7d | 1199 | { |
0d4137cc | 1200 | int r, w; |
5bd171bd CB |
1201 | char buf[LXC_TERMINAL_BUFFER_SIZE]; |
1202 | struct lxc_terminal_state *ts = cbdata; | |
63376d7d | 1203 | |
36a94ce8 | 1204 | if (fd != ts->ptxfd) |
a529bc25 | 1205 | return LXC_MAINLOOP_CLOSE; |
97bc2422 | 1206 | |
e66b6c96 CB |
1207 | r = lxc_read_nointr(fd, buf, sizeof(buf)); |
1208 | if (r <= 0) | |
a529bc25 | 1209 | return LXC_MAINLOOP_CLOSE; |
1560f6c9 | 1210 | |
e66b6c96 | 1211 | w = lxc_write_nointr(ts->stdoutfd, buf, r); |
5bd171bd | 1212 | if (w <= 0 || w != r) |
a529bc25 | 1213 | return LXC_MAINLOOP_CLOSE; |
f78a1f32 | 1214 | |
5bd171bd | 1215 | return LXC_MAINLOOP_CONTINUE; |
b5159817 DE |
1216 | } |
1217 | ||
36a94ce8 | 1218 | int lxc_terminal_getfd(struct lxc_container *c, int *ttynum, int *ptxfd) |
b5159817 | 1219 | { |
7e85a2c4 | 1220 | return lxc_cmd_get_tty_fd(c->name, ttynum, ptxfd, c->config_path); |
b5159817 DE |
1221 | } |
1222 | ||
1223 | int lxc_console(struct lxc_container *c, int ttynum, | |
1224 | int stdinfd, int stdoutfd, int stderrfd, | |
1225 | int escape) | |
1226 | { | |
36a94ce8 | 1227 | int ptxfd, ret, ttyfd; |
3298b37d | 1228 | struct lxc_async_descr descr; |
b5159817 | 1229 | struct termios oldtios; |
5b55021f | 1230 | struct lxc_terminal_state *ts; |
28327a43 CB |
1231 | struct lxc_terminal terminal = { |
1232 | .tty_state = NULL, | |
1233 | }; | |
25964232 | 1234 | int istty = 0; |
b5159817 | 1235 | |
7e85a2c4 | 1236 | ttyfd = lxc_cmd_get_tty_fd(c->name, &ttynum, &ptxfd, c->config_path); |
6834f805 CB |
1237 | if (ttyfd < 0) |
1238 | return -1; | |
b5159817 DE |
1239 | |
1240 | ret = setsid(); | |
33b4b411 CB |
1241 | if (ret < 0) |
1242 | TRACE("Process is already group leader"); | |
b5159817 | 1243 | |
36a94ce8 | 1244 | ts = lxc_terminal_signal_init(stdinfd, ptxfd); |
b5159817 DE |
1245 | if (!ts) { |
1246 | ret = -1; | |
33b4b411 | 1247 | goto close_fds; |
b5159817 | 1248 | } |
28327a43 | 1249 | terminal.tty_state = ts; |
b5159817 | 1250 | ts->escape = escape; |
3b975060 | 1251 | ts->stdoutfd = stdoutfd; |
b5159817 | 1252 | |
6834f805 | 1253 | istty = isatty(stdinfd); |
25964232 | 1254 | if (istty) { |
36a94ce8 CB |
1255 | lxc_terminal_winsz(stdinfd, ptxfd); |
1256 | lxc_terminal_winsz(ts->stdinfd, ts->ptxfd); | |
6834f805 | 1257 | } else { |
71ac3f07 | 1258 | INFO("File descriptor %d does not refer to a terminal", stdinfd); |
25964232 | 1259 | } |
b5159817 DE |
1260 | |
1261 | ret = lxc_mainloop_open(&descr); | |
1262 | if (ret) { | |
33b4b411 CB |
1263 | ERROR("Failed to create mainloop"); |
1264 | goto sigwinch_fini; | |
b5159817 DE |
1265 | } |
1266 | ||
341c2aed CB |
1267 | if (ts->sigfd != -1) { |
1268 | ret = lxc_mainloop_add_handler(&descr, ts->sigfd, | |
543d2f83 CB |
1269 | lxc_terminal_signalfd_cb, |
1270 | default_cleanup_handler, | |
1271 | ts, "lxc_terminal_signalfd_cb"); | |
33b4b411 | 1272 | if (ret < 0) { |
0519b5cc | 1273 | ERROR("Failed to add signal handler to mainloop"); |
33b4b411 | 1274 | goto close_mainloop; |
341c2aed | 1275 | } |
b5159817 DE |
1276 | } |
1277 | ||
1278 | ret = lxc_mainloop_add_handler(&descr, ts->stdinfd, | |
543d2f83 CB |
1279 | lxc_terminal_stdin_cb, |
1280 | default_cleanup_handler, | |
1281 | ts, "lxc_terminal_stdin_cb"); | |
33b4b411 CB |
1282 | if (ret < 0) { |
1283 | ERROR("Failed to add stdin handler"); | |
1284 | goto close_mainloop; | |
b5159817 DE |
1285 | } |
1286 | ||
36a94ce8 | 1287 | ret = lxc_mainloop_add_handler(&descr, ts->ptxfd, |
543d2f83 CB |
1288 | lxc_terminal_ptx_cb, |
1289 | default_cleanup_handler, | |
1290 | ts, "lxc_terminal_ptx_cb"); | |
33b4b411 | 1291 | if (ret < 0) { |
36a94ce8 | 1292 | ERROR("Failed to add ptx handler"); |
33b4b411 | 1293 | goto close_mainloop; |
b5159817 DE |
1294 | } |
1295 | ||
686df166 CB |
1296 | if (ts->escape >= 1) { |
1297 | fprintf(stderr, | |
1298 | "\n" | |
6834f805 CB |
1299 | "Connected to tty %1$d\n" |
1300 | "Type <Ctrl+%2$c q> to exit the console, " | |
1301 | "<Ctrl+%2$c Ctrl+%2$c> to enter Ctrl+%2$c itself\n", | |
1302 | ttynum, 'a' + escape - 1); | |
686df166 | 1303 | } |
6834f805 CB |
1304 | |
1305 | if (istty) { | |
1306 | ret = lxc_setup_tios(stdinfd, &oldtios); | |
1307 | if (ret < 0) | |
1308 | goto close_mainloop; | |
1309 | } | |
1310 | ||
025ed0f3 | 1311 | ret = lxc_mainloop(&descr, -1); |
33b4b411 CB |
1312 | if (ret < 0) { |
1313 | ERROR("The mainloop returned an error"); | |
6834f805 | 1314 | goto restore_tios; |
b5159817 DE |
1315 | } |
1316 | ||
1317 | ret = 0; | |
1318 | ||
6834f805 CB |
1319 | restore_tios: |
1320 | if (istty) { | |
1321 | istty = tcsetattr(stdinfd, TCSAFLUSH, &oldtios); | |
1322 | if (istty < 0) | |
a24c5678 | 1323 | SYSWARN("Failed to restore terminal properties"); |
6834f805 CB |
1324 | } |
1325 | ||
33b4b411 | 1326 | close_mainloop: |
b5159817 | 1327 | lxc_mainloop_close(&descr); |
33b4b411 CB |
1328 | |
1329 | sigwinch_fini: | |
28327a43 | 1330 | lxc_terminal_signal_fini(&terminal); |
33b4b411 CB |
1331 | |
1332 | close_fds: | |
36a94ce8 | 1333 | close(ptxfd); |
b5159817 | 1334 | close(ttyfd); |
33b4b411 | 1335 | |
b5159817 | 1336 | return ret; |
63376d7d | 1337 | } |
e98affda | 1338 | |
cd0a2b2f | 1339 | int lxc_make_controlling_terminal(int fd) |
e98affda CB |
1340 | { |
1341 | int ret; | |
1342 | ||
1343 | setsid(); | |
1344 | ||
1345 | ret = ioctl(fd, TIOCSCTTY, (char *)NULL); | |
1346 | if (ret < 0) | |
1347 | return -1; | |
1348 | ||
1349 | return 0; | |
1350 | } | |
1351 | ||
d049f0e9 | 1352 | int lxc_terminal_prepare_login(int fd) |
e98affda CB |
1353 | { |
1354 | int ret; | |
1355 | ||
cd0a2b2f | 1356 | ret = lxc_make_controlling_terminal(fd); |
e98affda CB |
1357 | if (ret < 0) |
1358 | return -1; | |
1359 | ||
ae6d3913 | 1360 | ret = lxc_terminal_set_stdfds(fd); |
e98affda CB |
1361 | if (ret < 0) |
1362 | return -1; | |
1363 | ||
1364 | if (fd > STDERR_FILENO) | |
1365 | close(fd); | |
1366 | ||
1367 | return 0; | |
1368 | } | |
1369 | ||
e9a55b51 | 1370 | void lxc_terminal_info_init(struct lxc_terminal_info *terminal) |
e98affda | 1371 | { |
e9a55b51 | 1372 | terminal->name[0] = '\0'; |
36a94ce8 | 1373 | terminal->ptx = -EBADF; |
41808e20 | 1374 | terminal->pty = -EBADF; |
e9a55b51 | 1375 | terminal->busy = -1; |
e98affda CB |
1376 | } |
1377 | ||
e9a55b51 | 1378 | void lxc_terminal_init(struct lxc_terminal *terminal) |
e98affda | 1379 | { |
e9a55b51 | 1380 | memset(terminal, 0, sizeof(*terminal)); |
d926c261 | 1381 | terminal->pty_nr = -1; |
41808e20 | 1382 | terminal->pty = -EBADF; |
36a94ce8 | 1383 | terminal->ptx = -EBADF; |
e9a55b51 CB |
1384 | terminal->peer = -EBADF; |
1385 | terminal->log_fd = -EBADF; | |
1386 | lxc_terminal_info_init(&terminal->proxy); | |
e98affda CB |
1387 | } |
1388 | ||
dcad02f8 | 1389 | void lxc_terminal_conf_free(struct lxc_terminal *terminal) |
e98affda | 1390 | { |
2083d59d CB |
1391 | free(terminal->log_path); |
1392 | free(terminal->path); | |
1393 | if (terminal->buffer_size > 0 && terminal->ringbuf.addr) | |
1394 | lxc_ringbuf_release(&terminal->ringbuf); | |
28327a43 | 1395 | lxc_terminal_signal_fini(terminal); |
e98affda | 1396 | } |