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Commit | Line | Data |
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b0a33c1e | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
b0a33c1e | 8 | * |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
b0a33c1e | 22 | */ |
23 | ||
d38dd64a CB |
24 | #ifndef _GNU_SOURCE |
25 | #define _GNU_SOURCE 1 | |
26 | #endif | |
9395937a CB |
27 | #include <errno.h> |
28 | #include <fcntl.h> | |
e62912bd | 29 | #include <lxc/lxccontainer.h> |
b467714b | 30 | #include <pthread.h> |
b5159817 | 31 | #include <signal.h> |
b0a33c1e | 32 | #include <stdio.h> |
e0dc0de7 | 33 | #include <stdlib.h> |
da41561c CB |
34 | #include <sys/epoll.h> |
35 | #include <sys/types.h> | |
e62912bd CB |
36 | #include <termios.h> |
37 | #include <unistd.h> | |
f2363e38 | 38 | |
9395937a CB |
39 | #include "af_unix.h" |
40 | #include "caps.h" | |
41 | #include "commands.h" | |
00dbc43e | 42 | #include "conf.h" |
e827ff7e | 43 | #include "config.h" |
9395937a | 44 | #include "log.h" |
b5159817 | 45 | #include "lxclock.h" |
9395937a | 46 | #include "mainloop.h" |
e62912bd | 47 | #include "start.h" |
0ed9b1bc | 48 | #include "terminal.h" |
b5159817 | 49 | #include "utils.h" |
36eb9bde | 50 | |
e827ff7e SG |
51 | #if HAVE_PTY_H |
52 | #include <pty.h> | |
53 | #else | |
54 | #include <../include/openpty.h> | |
55 | #endif | |
56 | ||
de708fb7 | 57 | #define LXC_TERMINAL_BUFFER_SIZE 1024 |
732375f5 | 58 | |
2083d59d | 59 | lxc_log_define(terminal, lxc); |
36eb9bde | 60 | |
b5159817 | 61 | static struct lxc_list lxc_ttys; |
724e753c | 62 | |
b5159817 | 63 | typedef void (*sighandler_t)(int); |
b5159817 | 64 | |
fc26f086 | 65 | __attribute__((constructor)) void lxc_terminal_init_global(void) |
b5159817 DE |
66 | { |
67 | lxc_list_init(&lxc_ttys); | |
68 | } | |
724e753c | 69 | |
4e9c0330 | 70 | void lxc_terminal_winsz(int srcfd, int dstfd) |
b5159817 | 71 | { |
0519b5cc | 72 | int ret; |
b5159817 | 73 | struct winsize wsz; |
0519b5cc CB |
74 | |
75 | if (!isatty(srcfd)) | |
76 | return; | |
77 | ||
78 | ret = ioctl(srcfd, TIOCGWINSZ, &wsz); | |
79 | if (ret < 0) { | |
80 | WARN("Failed to get window size"); | |
81 | return; | |
724e753c | 82 | } |
0519b5cc CB |
83 | |
84 | ret = ioctl(dstfd, TIOCSWINSZ, &wsz); | |
85 | if (ret < 0) | |
86 | WARN("Failed to set window size"); | |
87 | else | |
88 | DEBUG("Set window size to %d columns and %d rows", wsz.ws_col, | |
89 | wsz.ws_row); | |
90 | ||
91 | return; | |
b5159817 | 92 | } |
724e753c | 93 | |
5b55021f | 94 | static void lxc_terminal_winch(struct lxc_terminal_state *ts) |
b5159817 | 95 | { |
4e9c0330 | 96 | lxc_terminal_winsz(ts->stdinfd, ts->masterfd); |
0519b5cc | 97 | |
0d4137cc | 98 | if (ts->winch_proxy) |
8ccbbf94 | 99 | lxc_cmd_terminal_winch(ts->winch_proxy, ts->winch_proxy_lxcpath); |
724e753c MN |
100 | } |
101 | ||
dad4a039 | 102 | void lxc_terminal_sigwinch(int sig) |
cd453b38 | 103 | { |
025ed0f3 | 104 | struct lxc_list *it; |
5b55021f | 105 | struct lxc_terminal_state *ts; |
cd453b38 | 106 | |
025ed0f3 SH |
107 | lxc_list_for_each(it, &lxc_ttys) { |
108 | ts = it->elem; | |
7a10164a | 109 | lxc_terminal_winch(ts); |
cd453b38 | 110 | } |
b5159817 | 111 | } |
cd453b38 | 112 | |
9bafc8cb CB |
113 | int lxc_terminal_signalfd_cb(int fd, uint32_t events, void *cbdata, |
114 | struct lxc_epoll_descr *descr) | |
b5159817 | 115 | { |
1349e92e | 116 | ssize_t ret; |
b5159817 | 117 | struct signalfd_siginfo siginfo; |
5b55021f | 118 | struct lxc_terminal_state *ts = cbdata; |
b5159817 | 119 | |
72f7c19b | 120 | ret = lxc_read_nointr(fd, &siginfo, sizeof(siginfo)); |
0d4137cc | 121 | if (ret < 0 || (size_t)ret < sizeof(siginfo)) { |
0519b5cc | 122 | ERROR("Failed to read signal info"); |
2e943b7b | 123 | return LXC_MAINLOOP_ERROR; |
cd453b38 DL |
124 | } |
125 | ||
1349e92e | 126 | if (siginfo.ssi_signo == SIGTERM) { |
9bafc8cb | 127 | DEBUG("Received SIGTERM. Detaching from the terminal"); |
a529bc25 | 128 | return LXC_MAINLOOP_CLOSE; |
1349e92e CB |
129 | } |
130 | ||
131 | if (siginfo.ssi_signo == SIGWINCH) | |
7a10164a | 132 | lxc_terminal_winch(ts); |
1349e92e | 133 | |
2e943b7b | 134 | return LXC_MAINLOOP_CONTINUE; |
b5159817 DE |
135 | } |
136 | ||
5b55021f | 137 | struct lxc_terminal_state *lxc_terminal_signal_init(int srcfd, int dstfd) |
b5159817 | 138 | { |
1349e92e | 139 | int ret; |
b6d5de95 | 140 | bool istty = false; |
b5159817 | 141 | sigset_t mask; |
5b55021f | 142 | struct lxc_terminal_state *ts; |
b5159817 DE |
143 | |
144 | ts = malloc(sizeof(*ts)); | |
145 | if (!ts) | |
146 | return NULL; | |
147 | ||
148 | memset(ts, 0, sizeof(*ts)); | |
341c2aed | 149 | ts->stdinfd = srcfd; |
b5159817 | 150 | ts->masterfd = dstfd; |
341c2aed | 151 | ts->sigfd = -1; |
b5159817 | 152 | |
b6d5de95 CB |
153 | ret = sigemptyset(&mask); |
154 | if (ret < 0) { | |
155 | SYSERROR("Failed to initialize an empty signal set"); | |
156 | goto on_error; | |
157 | } | |
1349e92e | 158 | |
b6d5de95 | 159 | istty = (isatty(srcfd) == 1); |
0519b5cc | 160 | if (!istty) { |
25964232 | 161 | INFO("fd %d does not refer to a tty device", srcfd); |
1349e92e CB |
162 | } else { |
163 | /* Add tty to list to be scanned at SIGWINCH time. */ | |
164 | lxc_list_add_elem(&ts->node, ts); | |
165 | lxc_list_add_tail(&lxc_ttys, &ts->node); | |
b6d5de95 CB |
166 | ret = sigaddset(&mask, SIGWINCH); |
167 | if (ret < 0) | |
7874d81a | 168 | SYSNOTICE("Failed to add SIGWINCH to signal set"); |
25964232 LF |
169 | } |
170 | ||
1349e92e | 171 | /* Exit the mainloop cleanly on SIGTERM. */ |
b6d5de95 CB |
172 | ret = sigaddset(&mask, SIGTERM); |
173 | if (ret < 0) { | |
174 | SYSERROR("Failed to add SIGWINCH to signal set"); | |
175 | goto on_error; | |
176 | } | |
b5159817 | 177 | |
b467714b | 178 | ret = pthread_sigmask(SIG_BLOCK, &mask, &ts->oldmask); |
1349e92e CB |
179 | if (ret < 0) { |
180 | WARN("Failed to block signals"); | |
181 | goto on_error; | |
b5159817 DE |
182 | } |
183 | ||
dc5f6125 | 184 | ts->sigfd = signalfd(-1, &mask, SFD_CLOEXEC); |
b5159817 | 185 | if (ts->sigfd < 0) { |
1349e92e | 186 | WARN("Failed to create signal fd"); |
b467714b | 187 | (void)pthread_sigmask(SIG_SETMASK, &ts->oldmask, NULL); |
1349e92e | 188 | goto on_error; |
b5159817 DE |
189 | } |
190 | ||
1349e92e CB |
191 | DEBUG("Created signal fd %d", ts->sigfd); |
192 | return ts; | |
193 | ||
194 | on_error: | |
195 | ERROR("Failed to create signal fd"); | |
196 | if (ts->sigfd >= 0) { | |
197 | close(ts->sigfd); | |
198 | ts->sigfd = -1; | |
199 | } | |
b6d5de95 | 200 | |
1349e92e CB |
201 | if (istty) |
202 | lxc_list_del(&ts->node); | |
b6d5de95 | 203 | |
b5159817 | 204 | return ts; |
cd453b38 DL |
205 | } |
206 | ||
5b55021f | 207 | void lxc_terminal_signal_fini(struct lxc_terminal_state *ts) |
63376d7d | 208 | { |
0e6da90b | 209 | if (ts->sigfd >= 0) { |
b5159817 | 210 | close(ts->sigfd); |
1349e92e | 211 | |
b467714b | 212 | if (pthread_sigmask(SIG_SETMASK, &ts->oldmask, NULL) < 0) |
a24c5678 | 213 | SYSWARN("Failed to restore signal mask"); |
0e6da90b | 214 | } |
0d4137cc | 215 | |
1349e92e CB |
216 | if (isatty(ts->stdinfd)) |
217 | lxc_list_del(&ts->node); | |
218 | ||
b5159817 DE |
219 | free(ts); |
220 | } | |
1560f6c9 | 221 | |
99a04585 | 222 | static int lxc_terminal_truncate_log_file(struct lxc_terminal *terminal) |
861813e5 CB |
223 | { |
224 | /* be very certain things are kosher */ | |
2083d59d | 225 | if (!terminal->log_path || terminal->log_fd < 0) |
861813e5 CB |
226 | return -EBADF; |
227 | ||
2083d59d | 228 | return lxc_unpriv(ftruncate(terminal->log_fd, 0)); |
861813e5 CB |
229 | } |
230 | ||
468724d3 | 231 | static int lxc_terminal_rotate_log_file(struct lxc_terminal *terminal) |
861813e5 CB |
232 | { |
233 | int ret; | |
234 | size_t len; | |
235 | char *tmp; | |
236 | ||
99a04585 | 237 | if (!terminal->log_path || terminal->log_rotate == 0) |
861813e5 CB |
238 | return -EOPNOTSUPP; |
239 | ||
240 | /* be very certain things are kosher */ | |
99a04585 | 241 | if (terminal->log_fd < 0) |
861813e5 CB |
242 | return -EBADF; |
243 | ||
99a04585 | 244 | len = strlen(terminal->log_path) + sizeof(".1"); |
861813e5 CB |
245 | tmp = alloca(len); |
246 | ||
99a04585 | 247 | ret = snprintf(tmp, len, "%s.1", terminal->log_path); |
861813e5 CB |
248 | if (ret < 0 || (size_t)ret >= len) |
249 | return -EFBIG; | |
250 | ||
99a04585 CB |
251 | close(terminal->log_fd); |
252 | terminal->log_fd = -1; | |
253 | ret = lxc_unpriv(rename(terminal->log_path, tmp)); | |
861813e5 CB |
254 | if (ret < 0) |
255 | return ret; | |
256 | ||
99a04585 | 257 | return lxc_terminal_create_log_file(terminal); |
861813e5 CB |
258 | } |
259 | ||
a44ae1a9 | 260 | static int lxc_terminal_write_log_file(struct lxc_terminal *terminal, char *buf, |
8903fb08 | 261 | int bytes_read) |
861813e5 CB |
262 | { |
263 | int ret; | |
861813e5 | 264 | struct stat st; |
8903fb08 | 265 | int64_t space_left = -1; |
861813e5 | 266 | |
99a04585 | 267 | if (terminal->log_fd < 0) |
861813e5 CB |
268 | return 0; |
269 | ||
270 | /* A log size <= 0 means that there's no limit on the size of the log | |
271 | * file at which point we simply ignore whether the log is supposed to | |
272 | * be rotated or not. | |
273 | */ | |
99a04585 CB |
274 | if (terminal->log_size <= 0) |
275 | return lxc_write_nointr(terminal->log_fd, buf, bytes_read); | |
861813e5 CB |
276 | |
277 | /* Get current size of the log file. */ | |
99a04585 | 278 | ret = fstat(terminal->log_fd, &st); |
861813e5 | 279 | if (ret < 0) { |
99a04585 | 280 | SYSERROR("Failed to stat the terminal log file descriptor"); |
861813e5 CB |
281 | return -1; |
282 | } | |
283 | ||
284 | /* handle non-regular files */ | |
285 | if ((st.st_mode & S_IFMT) != S_IFREG) { | |
286 | /* This isn't a regular file. so rotating the file seems a | |
287 | * dangerous thing to do, size limits are also very | |
288 | * questionable. Let's not risk anything and tell the user that | |
289 | * he's requesting us to do weird stuff. | |
290 | */ | |
99a04585 | 291 | if (terminal->log_rotate > 0 || terminal->log_size > 0) |
861813e5 CB |
292 | return -EINVAL; |
293 | ||
294 | /* I mean, sure log wherever you want to. */ | |
99a04585 | 295 | return lxc_write_nointr(terminal->log_fd, buf, bytes_read); |
861813e5 CB |
296 | } |
297 | ||
99a04585 | 298 | space_left = terminal->log_size - st.st_size; |
861813e5 CB |
299 | |
300 | /* User doesn't want to rotate the log file and there's no more space | |
301 | * left so simply truncate it. | |
302 | */ | |
99a04585 CB |
303 | if (space_left <= 0 && terminal->log_rotate <= 0) { |
304 | ret = lxc_terminal_truncate_log_file(terminal); | |
861813e5 CB |
305 | if (ret < 0) |
306 | return ret; | |
307 | ||
99a04585 CB |
308 | if (bytes_read <= terminal->log_size) |
309 | return lxc_write_nointr(terminal->log_fd, buf, bytes_read); | |
861813e5 CB |
310 | |
311 | /* Write as much as we can into the buffer and loose the rest. */ | |
99a04585 | 312 | return lxc_write_nointr(terminal->log_fd, buf, terminal->log_size); |
861813e5 CB |
313 | } |
314 | ||
315 | /* There's enough space left. */ | |
316 | if (bytes_read <= space_left) | |
99a04585 | 317 | return lxc_write_nointr(terminal->log_fd, buf, bytes_read); |
861813e5 CB |
318 | |
319 | /* There's not enough space left but at least write as much as we can | |
320 | * into the old log file. | |
321 | */ | |
99a04585 | 322 | ret = lxc_write_nointr(terminal->log_fd, buf, space_left); |
861813e5 CB |
323 | if (ret < 0) |
324 | return -1; | |
325 | ||
326 | /* Calculate how many bytes we still need to write. */ | |
327 | bytes_read -= space_left; | |
328 | ||
89962c6c | 329 | /* There'd be more to write but we aren't instructed to rotate the log |
861813e5 CB |
330 | * file so simply return. There's no error on our side here. |
331 | */ | |
99a04585 | 332 | if (terminal->log_rotate > 0) |
468724d3 | 333 | ret = lxc_terminal_rotate_log_file(terminal); |
861813e5 | 334 | else |
99a04585 | 335 | ret = lxc_terminal_truncate_log_file(terminal); |
861813e5 CB |
336 | if (ret < 0) |
337 | return ret; | |
338 | ||
99a04585 | 339 | if (terminal->log_size < bytes_read) { |
861813e5 CB |
340 | /* Well, this is unfortunate because it means that there is more |
341 | * to write than the user has granted us space. There are | |
342 | * multiple ways to handle this but let's use the simplest one: | |
343 | * write as much as we can, tell the user that there was more | |
344 | * stuff to write and move on. | |
345 | * Note that this scenario shouldn't actually happen with the | |
99a04585 | 346 | * standard pty-based terminal that LXC allocates since it will |
861813e5 CB |
347 | * be switched into raw mode. In raw mode only 1 byte at a time |
348 | * should be read and written. | |
349 | */ | |
99a04585 CB |
350 | WARN("Size of terminal log file is smaller than the bytes to write"); |
351 | ret = lxc_write_nointr(terminal->log_fd, buf, terminal->log_size); | |
861813e5 CB |
352 | if (ret < 0) |
353 | return -1; | |
354 | bytes_read -= ret; | |
355 | return bytes_read; | |
356 | } | |
357 | ||
358 | /* Yay, we made it. */ | |
99a04585 | 359 | ret = lxc_write_nointr(terminal->log_fd, buf, bytes_read); |
861813e5 CB |
360 | if (ret < 0) |
361 | return -1; | |
362 | bytes_read -= ret; | |
363 | return bytes_read; | |
364 | } | |
365 | ||
de708fb7 | 366 | int lxc_terminal_io_cb(int fd, uint32_t events, void *data, |
a529bc25 | 367 | struct lxc_epoll_descr *descr) |
b5159817 | 368 | { |
dcad02f8 | 369 | struct lxc_terminal *terminal = data; |
de708fb7 | 370 | char buf[LXC_TERMINAL_BUFFER_SIZE]; |
732375f5 | 371 | int r, w, w_log, w_rbuf; |
e0dc0de7 | 372 | |
3e6580ec CB |
373 | w = r = lxc_read_nointr(fd, buf, sizeof(buf)); |
374 | if (r <= 0) { | |
de708fb7 | 375 | INFO("Terminal client on fd %d has exited", fd); |
b5159817 | 376 | lxc_mainloop_del_handler(descr, fd); |
c06a0555 | 377 | |
de708fb7 CB |
378 | if (fd == terminal->master) { |
379 | terminal->master = -EBADF; | |
380 | } else if (fd == terminal->peer) { | |
381 | if (terminal->tty_state) { | |
382 | lxc_terminal_signal_fini(terminal->tty_state); | |
383 | terminal->tty_state = NULL; | |
0b1e242b | 384 | } |
de708fb7 | 385 | terminal->peer = -EBADF; |
c06a0555 CB |
386 | } else { |
387 | ERROR("Handler received unexpected file descriptor"); | |
0b1e242b | 388 | } |
b5159817 | 389 | close(fd); |
c06a0555 | 390 | |
a529bc25 | 391 | return LXC_MAINLOOP_CLOSE; |
33fcb7a0 | 392 | } |
63376d7d | 393 | |
de708fb7 CB |
394 | if (fd == terminal->peer) |
395 | w = lxc_write_nointr(terminal->master, buf, r); | |
b5159817 | 396 | |
732375f5 | 397 | w_rbuf = w_log = 0; |
de708fb7 | 398 | if (fd == terminal->master) { |
732375f5 | 399 | /* write to peer first */ |
de708fb7 CB |
400 | if (terminal->peer >= 0) |
401 | w = lxc_write_nointr(terminal->peer, buf, r); | |
732375f5 | 402 | |
de708fb7 CB |
403 | /* write to terminal ringbuffer */ |
404 | if (terminal->buffer_size > 0) | |
405 | w_rbuf = lxc_ringbuf_write(&terminal->ringbuf, buf, r); | |
861813e5 | 406 | |
de708fb7 CB |
407 | /* write to terminal log */ |
408 | if (terminal->log_fd >= 0) | |
a44ae1a9 | 409 | w_log = lxc_terminal_write_log_file(terminal, buf, r); |
63376d7d DL |
410 | } |
411 | ||
b5159817 | 412 | if (w != r) |
de708fb7 | 413 | WARN("Short write on terminal r:%d != w:%d", r, w); |
732375f5 | 414 | |
7874d81a | 415 | if (w_rbuf < 0) { |
416 | errno = -w_rbuf; | |
417 | SYSTRACE("Failed to write %d bytes to terminal ringbuffer", r); | |
418 | } | |
732375f5 CB |
419 | |
420 | if (w_log < 0) | |
de708fb7 | 421 | TRACE("Failed to write %d bytes to terminal log", r); |
0d4137cc | 422 | |
2b8bf299 | 423 | return LXC_MAINLOOP_CONTINUE; |
b5159817 DE |
424 | } |
425 | ||
dcad02f8 | 426 | static int lxc_terminal_mainloop_add_peer(struct lxc_terminal *terminal) |
b5159817 | 427 | { |
a529bc25 CB |
428 | int ret; |
429 | ||
2083d59d CB |
430 | if (terminal->peer >= 0) { |
431 | ret = lxc_mainloop_add_handler(terminal->descr, terminal->peer, | |
432 | lxc_terminal_io_cb, terminal); | |
a529bc25 | 433 | if (ret < 0) { |
2083d59d | 434 | WARN("Failed to add terminal peer handler to mainloop"); |
a529bc25 CB |
435 | return -1; |
436 | } | |
63376d7d DL |
437 | } |
438 | ||
2083d59d | 439 | if (!terminal->tty_state || terminal->tty_state->sigfd < 0) |
a529bc25 CB |
440 | return 0; |
441 | ||
2083d59d CB |
442 | ret = lxc_mainloop_add_handler(terminal->descr, terminal->tty_state->sigfd, |
443 | lxc_terminal_signalfd_cb, terminal->tty_state); | |
a529bc25 CB |
444 | if (ret < 0) { |
445 | WARN("Failed to add signal handler to mainloop"); | |
446 | return -1; | |
b5159817 | 447 | } |
a529bc25 CB |
448 | |
449 | return 0; | |
b5159817 DE |
450 | } |
451 | ||
093bce5f | 452 | int lxc_terminal_mainloop_add(struct lxc_epoll_descr *descr, |
ea5b3c23 | 453 | struct lxc_terminal *terminal) |
b5159817 | 454 | { |
a529bc25 | 455 | int ret; |
b5159817 | 456 | |
2083d59d CB |
457 | if (terminal->master < 0) { |
458 | INFO("Terminal is not initialized"); | |
b5159817 | 459 | return 0; |
596a818d DE |
460 | } |
461 | ||
2083d59d CB |
462 | ret = lxc_mainloop_add_handler(descr, terminal->master, |
463 | lxc_terminal_io_cb, terminal); | |
30a33fbd | 464 | if (ret < 0) { |
ea5b3c23 CB |
465 | ERROR("Failed to add handler for terminal master fd %d to " |
466 | "mainloop", terminal->master); | |
b5159817 | 467 | return -1; |
28a4b0e5 DL |
468 | } |
469 | ||
30a33fbd | 470 | /* We cache the descr so that we can add an fd to it when someone |
c1ee47cd | 471 | * does attach to it in lxc_terminal_allocate(). |
b5159817 | 472 | */ |
2083d59d | 473 | terminal->descr = descr; |
cd453b38 | 474 | |
ea5b3c23 | 475 | return lxc_terminal_mainloop_add_peer(terminal); |
b5159817 | 476 | } |
28a4b0e5 | 477 | |
0d4137cc | 478 | int lxc_setup_tios(int fd, struct termios *oldtios) |
b5159817 | 479 | { |
e4953e62 | 480 | int ret; |
b5159817 | 481 | struct termios newtios; |
e0dc0de7 | 482 | |
b5159817 | 483 | if (!isatty(fd)) { |
e4953e62 | 484 | ERROR("File descriptor %d does not refert to a terminal", fd); |
b5159817 | 485 | return -1; |
e0dc0de7 DL |
486 | } |
487 | ||
e4953e62 CB |
488 | /* Get current termios. */ |
489 | ret = tcgetattr(fd, oldtios); | |
490 | if (ret < 0) { | |
491 | SYSERROR("Failed to get current terminal settings"); | |
b5159817 | 492 | return -1; |
e0dc0de7 DL |
493 | } |
494 | ||
4dc96430 TJ |
495 | /* ensure we don't end up in an endless loop: |
496 | * The kernel might fire SIGTTOU while an | |
497 | * ioctl() in tcsetattr() is executed. When the ioctl() | |
498 | * is resumed and retries, the signal handler interrupts it again. | |
499 | */ | |
500 | signal (SIGTTIN, SIG_IGN); | |
501 | signal (SIGTTOU, SIG_IGN); | |
502 | ||
b5159817 | 503 | newtios = *oldtios; |
e0dc0de7 | 504 | |
a7c97a40 CB |
505 | /* We use the same settings that ssh does. */ |
506 | newtios.c_iflag |= IGNPAR; | |
507 | newtios.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF); | |
508 | #ifdef IUCLC | |
509 | newtios.c_iflag &= ~IUCLC; | |
510 | #endif | |
4dc96430 | 511 | newtios.c_lflag &= ~(TOSTOP | ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL); |
a7c97a40 CB |
512 | #ifdef IEXTEN |
513 | newtios.c_lflag &= ~IEXTEN; | |
514 | #endif | |
e5adb2b5 | 515 | newtios.c_oflag &= ~ONLCR; |
300ec717 | 516 | newtios.c_oflag |= OPOST; |
b5159817 DE |
517 | newtios.c_cc[VMIN] = 1; |
518 | newtios.c_cc[VTIME] = 0; | |
e0dc0de7 | 519 | |
a7c97a40 | 520 | /* Set new attributes. */ |
e4953e62 CB |
521 | ret = tcsetattr(fd, TCSAFLUSH, &newtios); |
522 | if (ret < 0) { | |
523 | ERROR("Failed to set new terminal settings"); | |
b5159817 | 524 | return -1; |
e0dc0de7 DL |
525 | } |
526 | ||
63376d7d | 527 | return 0; |
b5159817 | 528 | } |
e0dc0de7 | 529 | |
dcad02f8 | 530 | static void lxc_terminal_peer_proxy_free(struct lxc_terminal *terminal) |
b5159817 | 531 | { |
2083d59d CB |
532 | if (terminal->tty_state) { |
533 | lxc_terminal_signal_fini(terminal->tty_state); | |
534 | terminal->tty_state = NULL; | |
b5159817 | 535 | } |
e788f4ac | 536 | |
fb87aa6a | 537 | close(terminal->proxy.master); |
fb87aa6a | 538 | terminal->proxy.master = -1; |
e788f4ac CB |
539 | |
540 | close(terminal->proxy.slave); | |
fb87aa6a | 541 | terminal->proxy.slave = -1; |
e788f4ac | 542 | |
fb87aa6a | 543 | terminal->proxy.busy = -1; |
e788f4ac | 544 | |
fb87aa6a | 545 | terminal->proxy.name[0] = '\0'; |
e788f4ac | 546 | |
2083d59d | 547 | terminal->peer = -1; |
b5159817 | 548 | } |
596a818d | 549 | |
60dd8ef4 CB |
550 | static int lxc_terminal_peer_proxy_alloc(struct lxc_terminal *terminal, |
551 | int sockfd) | |
b5159817 | 552 | { |
60dd8ef4 | 553 | int ret; |
b5159817 | 554 | struct termios oldtermio; |
5b55021f | 555 | struct lxc_terminal_state *ts; |
b5159817 | 556 | |
2083d59d CB |
557 | if (terminal->master < 0) { |
558 | ERROR("Terminal not set up"); | |
b5159817 DE |
559 | return -1; |
560 | } | |
60dd8ef4 | 561 | |
fb87aa6a | 562 | if (terminal->proxy.busy != -1 || terminal->peer != -1) { |
2083d59d | 563 | NOTICE("Terminal already in use"); |
b5159817 DE |
564 | return -1; |
565 | } | |
60dd8ef4 | 566 | |
2083d59d | 567 | if (terminal->tty_state) { |
60dd8ef4 | 568 | ERROR("Terminal has already been initialized"); |
b5159817 | 569 | return -1; |
596a818d DE |
570 | } |
571 | ||
d712f9e8 CB |
572 | /* This is the proxy terminal that will be given to the client, and |
573 | * that the real terminal master will send to / recv from. | |
b5159817 | 574 | */ |
3f15bdd9 CB |
575 | ret = openpty(&terminal->proxy.master, &terminal->proxy.slave, NULL, |
576 | NULL, NULL); | |
60dd8ef4 CB |
577 | if (ret < 0) { |
578 | SYSERROR("Failed to open proxy terminal"); | |
b5159817 DE |
579 | return -1; |
580 | } | |
596a818d | 581 | |
3f15bdd9 CB |
582 | ret = ttyname_r(terminal->proxy.slave, terminal->proxy.name, |
583 | sizeof(terminal->proxy.name)); | |
584 | if (ret < 0) { | |
585 | SYSERROR("Failed to retrieve name of proxy terminal slave"); | |
586 | goto on_error; | |
587 | } | |
588 | ||
408c18a1 CB |
589 | ret = fd_cloexec(terminal->proxy.master, true); |
590 | if (ret < 0) { | |
591 | SYSERROR("Failed to set FD_CLOEXEC flag on proxy terminal master"); | |
592 | goto on_error; | |
593 | } | |
594 | ||
595 | ret = fd_cloexec(terminal->proxy.slave, true); | |
596 | if (ret < 0) { | |
597 | SYSERROR("Failed to set FD_CLOEXEC flag on proxy terminal slave"); | |
598 | goto on_error; | |
599 | } | |
600 | ||
60dd8ef4 CB |
601 | ret = lxc_setup_tios(terminal->proxy.slave, &oldtermio); |
602 | if (ret < 0) | |
603 | goto on_error; | |
b5159817 | 604 | |
fb87aa6a | 605 | ts = lxc_terminal_signal_init(terminal->proxy.master, terminal->master); |
b5159817 | 606 | if (!ts) |
60dd8ef4 | 607 | goto on_error; |
b5159817 | 608 | |
2083d59d | 609 | terminal->tty_state = ts; |
fb87aa6a CB |
610 | terminal->peer = terminal->proxy.slave; |
611 | terminal->proxy.busy = sockfd; | |
2083d59d | 612 | ret = lxc_terminal_mainloop_add_peer(terminal); |
a529bc25 | 613 | if (ret < 0) |
60dd8ef4 | 614 | goto on_error; |
b5159817 | 615 | |
60dd8ef4 CB |
616 | NOTICE("Opened proxy terminal with master fd %d and slave fd %d", |
617 | terminal->proxy.master, terminal->proxy.slave); | |
b5159817 DE |
618 | return 0; |
619 | ||
60dd8ef4 | 620 | on_error: |
2083d59d | 621 | lxc_terminal_peer_proxy_free(terminal); |
63376d7d DL |
622 | return -1; |
623 | } | |
624 | ||
c1ee47cd | 625 | int lxc_terminal_allocate(struct lxc_conf *conf, int sockfd, int *ttyreq) |
b5159817 | 626 | { |
12c2eaaa CB |
627 | int ttynum; |
628 | int masterfd = -1; | |
0e4be3cf | 629 | struct lxc_tty_info *ttys = &conf->ttys; |
dcad02f8 | 630 | struct lxc_terminal *terminal = &conf->console; |
b5159817 | 631 | |
b5159817 | 632 | if (*ttyreq == 0) { |
12c2eaaa CB |
633 | int ret; |
634 | ||
635 | ret = lxc_terminal_peer_proxy_alloc(terminal, sockfd); | |
636 | if (ret < 0) | |
b5159817 | 637 | goto out; |
12c2eaaa | 638 | |
fb87aa6a | 639 | masterfd = terminal->proxy.master; |
b5159817 DE |
640 | goto out; |
641 | } | |
642 | ||
643 | if (*ttyreq > 0) { | |
885766f5 | 644 | if (*ttyreq > ttys->max) |
b5159817 DE |
645 | goto out; |
646 | ||
0e4be3cf | 647 | if (ttys->tty[*ttyreq - 1].busy) |
b5159817 DE |
648 | goto out; |
649 | ||
12c2eaaa | 650 | /* The requested tty is available. */ |
b5159817 DE |
651 | ttynum = *ttyreq; |
652 | goto out_tty; | |
653 | } | |
654 | ||
12c2eaaa | 655 | /* Search for next available tty, fixup index tty1 => [0]. */ |
885766f5 | 656 | for (ttynum = 1; ttynum <= ttys->max && ttys->tty[ttynum - 1].busy; ttynum++) { |
0d4137cc | 657 | ; |
12c2eaaa | 658 | } |
b5159817 | 659 | |
12c2eaaa | 660 | /* We didn't find any available slot for tty. */ |
885766f5 | 661 | if (ttynum > ttys->max) |
b5159817 DE |
662 | goto out; |
663 | ||
664 | *ttyreq = ttynum; | |
665 | ||
666 | out_tty: | |
0e4be3cf CB |
667 | ttys->tty[ttynum - 1].busy = sockfd; |
668 | masterfd = ttys->tty[ttynum - 1].master; | |
12c2eaaa | 669 | |
b5159817 | 670 | out: |
b5159817 DE |
671 | return masterfd; |
672 | } | |
673 | ||
3dfe6f8d | 674 | void lxc_terminal_free(struct lxc_conf *conf, int fd) |
63376d7d | 675 | { |
b5159817 | 676 | int i; |
0e4be3cf | 677 | struct lxc_tty_info *ttys = &conf->ttys; |
dcad02f8 | 678 | struct lxc_terminal *terminal = &conf->console; |
b5159817 | 679 | |
885766f5 | 680 | for (i = 0; i < ttys->max; i++) |
0e4be3cf CB |
681 | if (ttys->tty[i].busy == fd) |
682 | ttys->tty[i].busy = 0; | |
b5159817 | 683 | |
1b5e93c4 CB |
684 | if (terminal->proxy.busy != fd) |
685 | return; | |
686 | ||
687 | lxc_mainloop_del_handler(terminal->descr, terminal->proxy.slave); | |
688 | lxc_terminal_peer_proxy_free(terminal); | |
b5159817 DE |
689 | } |
690 | ||
dcad02f8 | 691 | static int lxc_terminal_peer_default(struct lxc_terminal *terminal) |
b5159817 | 692 | { |
5b55021f | 693 | struct lxc_terminal_state *ts; |
46768cce | 694 | const char *path; |
467c7ff3 | 695 | int ret = 0; |
b5159817 | 696 | |
46768cce CB |
697 | if (terminal->path) |
698 | path = terminal->path; | |
699 | else | |
700 | path = "/dev/tty"; | |
b5159817 | 701 | |
2083d59d CB |
702 | terminal->peer = lxc_unpriv(open(path, O_RDWR | O_CLOEXEC)); |
703 | if (terminal->peer < 0) { | |
46768cce CB |
704 | if (!terminal->path) { |
705 | errno = ENODEV; | |
7874d81a | 706 | SYSDEBUG("The process does not have a controlling terminal"); |
46768cce CB |
707 | goto on_succes; |
708 | } | |
709 | ||
6d1400b5 | 710 | SYSERROR("Failed to open proxy terminal \"%s\"", path); |
467c7ff3 CB |
711 | return -ENOTTY; |
712 | } | |
49cd0656 | 713 | DEBUG("Using terminal \"%s\" as proxy", path); |
b5159817 | 714 | |
2083d59d | 715 | if (!isatty(terminal->peer)) { |
49cd0656 CB |
716 | ERROR("File descriptor for \"%s\" does not refer to a terminal", path); |
717 | goto on_error_free_tios; | |
467c7ff3 | 718 | } |
b5159817 | 719 | |
2083d59d CB |
720 | ts = lxc_terminal_signal_init(terminal->peer, terminal->master); |
721 | terminal->tty_state = ts; | |
341c2aed | 722 | if (!ts) { |
0519b5cc | 723 | WARN("Failed to install signal handler"); |
49cd0656 | 724 | goto on_error_free_tios; |
341c2aed | 725 | } |
b5159817 | 726 | |
2083d59d | 727 | lxc_terminal_winsz(terminal->peer, terminal->master); |
b5159817 | 728 | |
2083d59d | 729 | terminal->tios = malloc(sizeof(*terminal->tios)); |
49cd0656 CB |
730 | if (!terminal->tios) |
731 | goto on_error_free_tios; | |
b5159817 | 732 | |
49cd0656 CB |
733 | ret = lxc_setup_tios(terminal->peer, terminal->tios); |
734 | if (ret < 0) | |
735 | goto on_error_close_peer; | |
467c7ff3 | 736 | else |
49cd0656 | 737 | goto on_succes; |
b5159817 | 738 | |
49cd0656 | 739 | on_error_free_tios: |
2083d59d CB |
740 | free(terminal->tios); |
741 | terminal->tios = NULL; | |
467c7ff3 | 742 | |
49cd0656 | 743 | on_error_close_peer: |
2083d59d CB |
744 | close(terminal->peer); |
745 | terminal->peer = -1; | |
467c7ff3 CB |
746 | ret = -ENOTTY; |
747 | ||
49cd0656 | 748 | on_succes: |
467c7ff3 | 749 | return ret; |
b5159817 DE |
750 | } |
751 | ||
dcad02f8 | 752 | int lxc_terminal_write_ringbuffer(struct lxc_terminal *terminal) |
39c6cdb7 CB |
753 | { |
754 | char *r_addr; | |
755 | ssize_t ret; | |
756 | uint64_t used; | |
2083d59d | 757 | struct lxc_ringbuf *buf = &terminal->ringbuf; |
39c6cdb7 CB |
758 | |
759 | /* There's not log file where we can dump the ringbuffer to. */ | |
2083d59d | 760 | if (terminal->log_fd < 0) |
39c6cdb7 CB |
761 | return 0; |
762 | ||
39c6cdb7 CB |
763 | used = lxc_ringbuf_used(buf); |
764 | if (used == 0) | |
765 | return 0; | |
766 | ||
2083d59d | 767 | ret = lxc_terminal_truncate_log_file(terminal); |
39c6cdb7 CB |
768 | if (ret < 0) |
769 | return ret; | |
770 | ||
771 | /* Write as much as we can without exceeding the limit. */ | |
2083d59d CB |
772 | if (terminal->log_size < used) |
773 | used = terminal->log_size; | |
39c6cdb7 CB |
774 | |
775 | r_addr = lxc_ringbuf_get_read_addr(buf); | |
2083d59d | 776 | ret = lxc_write_nointr(terminal->log_fd, r_addr, used); |
39c6cdb7 CB |
777 | if (ret < 0) |
778 | return -EIO; | |
779 | ||
780 | return 0; | |
781 | } | |
782 | ||
dcad02f8 | 783 | void lxc_terminal_delete(struct lxc_terminal *terminal) |
b5159817 | 784 | { |
69629c82 CB |
785 | int ret; |
786 | ||
2083d59d | 787 | ret = lxc_terminal_write_ringbuffer(terminal); |
39c6cdb7 | 788 | if (ret < 0) |
2083d59d | 789 | WARN("Failed to write terminal log to disk"); |
39c6cdb7 | 790 | |
2083d59d CB |
791 | if (terminal->tios && terminal->peer >= 0) { |
792 | ret = tcsetattr(terminal->peer, TCSAFLUSH, terminal->tios); | |
69629c82 | 793 | if (ret < 0) |
a24c5678 | 794 | SYSWARN("Failed to set old terminal settings"); |
69629c82 | 795 | } |
2083d59d CB |
796 | free(terminal->tios); |
797 | terminal->tios = NULL; | |
596a818d | 798 | |
2083d59d CB |
799 | if (terminal->peer >= 0) |
800 | close(terminal->peer); | |
801 | terminal->peer = -1; | |
bc9724f7 | 802 | |
2083d59d CB |
803 | if (terminal->master >= 0) |
804 | close(terminal->master); | |
805 | terminal->master = -1; | |
bc9724f7 | 806 | |
2083d59d CB |
807 | if (terminal->slave >= 0) |
808 | close(terminal->slave); | |
809 | terminal->slave = -1; | |
bc9724f7 | 810 | |
2083d59d CB |
811 | if (terminal->log_fd >= 0) |
812 | close(terminal->log_fd); | |
813 | terminal->log_fd = -1; | |
63376d7d DL |
814 | } |
815 | ||
3b988b33 CB |
816 | /** |
817 | * Note that this function needs to run before the mainloop starts. Since we | |
2083d59d CB |
818 | * register a handler for the terminal's masterfd when we create the mainloop |
819 | * the terminal handler needs to see an allocated ringbuffer. | |
3b988b33 | 820 | */ |
dcad02f8 | 821 | static int lxc_terminal_create_ringbuf(struct lxc_terminal *terminal) |
3b988b33 CB |
822 | { |
823 | int ret; | |
2083d59d CB |
824 | struct lxc_ringbuf *buf = &terminal->ringbuf; |
825 | uint64_t size = terminal->buffer_size; | |
3b988b33 CB |
826 | |
827 | /* no ringbuffer previously allocated and no ringbuffer requested */ | |
828 | if (!buf->addr && size <= 0) | |
829 | return 0; | |
830 | ||
831 | /* ringbuffer allocated but no new ringbuffer requested */ | |
832 | if (buf->addr && size <= 0) { | |
833 | lxc_ringbuf_release(buf); | |
834 | buf->addr = NULL; | |
835 | buf->r_off = 0; | |
836 | buf->w_off = 0; | |
837 | buf->size = 0; | |
2083d59d | 838 | TRACE("Deallocated terminal ringbuffer"); |
3b988b33 CB |
839 | return 0; |
840 | } | |
841 | ||
842 | if (size <= 0) | |
843 | return 0; | |
844 | ||
845 | /* check wether the requested size for the ringbuffer has changed */ | |
846 | if (buf->addr && buf->size != size) { | |
2083d59d CB |
847 | TRACE("Terminal ringbuffer size changed from %" PRIu64 |
848 | " to %" PRIu64 " bytes. Deallocating terminal ringbuffer", | |
3b988b33 CB |
849 | buf->size, size); |
850 | lxc_ringbuf_release(buf); | |
851 | } | |
852 | ||
853 | ret = lxc_ringbuf_create(buf, size); | |
854 | if (ret < 0) { | |
2083d59d | 855 | ERROR("Failed to setup %" PRIu64 " byte terminal ringbuffer", size); |
3b988b33 CB |
856 | return -1; |
857 | } | |
858 | ||
2083d59d | 859 | TRACE("Allocated %" PRIu64 " byte terminal ringbuffer", size); |
3b988b33 CB |
860 | return 0; |
861 | } | |
862 | ||
a0309168 | 863 | /** |
2083d59d CB |
864 | * This is the terminal log file. Please note that the terminal log file is |
865 | * (implementation wise not content wise) independent of the terminal ringbuffer. | |
a0309168 | 866 | */ |
dcad02f8 | 867 | int lxc_terminal_create_log_file(struct lxc_terminal *terminal) |
a0309168 | 868 | { |
2083d59d | 869 | if (!terminal->log_path) |
a0309168 CB |
870 | return 0; |
871 | ||
2083d59d CB |
872 | terminal->log_fd = lxc_unpriv(open(terminal->log_path, O_CLOEXEC | O_RDWR | O_CREAT | O_APPEND, 0600)); |
873 | if (terminal->log_fd < 0) { | |
874 | SYSERROR("Failed to open terminal log file \"%s\"", terminal->log_path); | |
a0309168 CB |
875 | return -1; |
876 | } | |
877 | ||
2083d59d | 878 | DEBUG("Using \"%s\" as terminal log file", terminal->log_path); |
a0309168 CB |
879 | return 0; |
880 | } | |
881 | ||
dcad02f8 | 882 | int lxc_terminal_create(struct lxc_terminal *terminal) |
63376d7d | 883 | { |
8ded9244 | 884 | int ret; |
b5159817 | 885 | |
3f15bdd9 | 886 | ret = openpty(&terminal->master, &terminal->slave, NULL, NULL, NULL); |
467c7ff3 | 887 | if (ret < 0) { |
8ded9244 | 888 | SYSERROR("Failed to open terminal"); |
b5159817 DE |
889 | return -1; |
890 | } | |
891 | ||
3f15bdd9 CB |
892 | ret = ttyname_r(terminal->slave, terminal->name, sizeof(terminal->name)); |
893 | if (ret < 0) { | |
894 | SYSERROR("Failed to retrieve name of terminal slave"); | |
895 | goto err; | |
896 | } | |
897 | ||
408c18a1 | 898 | ret = fd_cloexec(terminal->master, true); |
69629c82 | 899 | if (ret < 0) { |
2083d59d | 900 | SYSERROR("Failed to set FD_CLOEXEC flag on terminal master"); |
b5159817 DE |
901 | goto err; |
902 | } | |
903 | ||
408c18a1 | 904 | ret = fd_cloexec(terminal->slave, true); |
69629c82 | 905 | if (ret < 0) { |
2083d59d | 906 | SYSERROR("Failed to set FD_CLOEXEC flag on terminal slave"); |
b5159817 DE |
907 | goto err; |
908 | } | |
909 | ||
2083d59d | 910 | ret = lxc_terminal_peer_default(terminal); |
467c7ff3 | 911 | if (ret < 0) { |
8ded9244 | 912 | ERROR("Failed to allocate proxy terminal"); |
467c7ff3 CB |
913 | goto err; |
914 | } | |
b5159817 | 915 | |
5777fe90 CB |
916 | return 0; |
917 | ||
918 | err: | |
2083d59d | 919 | lxc_terminal_delete(terminal); |
5777fe90 CB |
920 | return -ENODEV; |
921 | } | |
922 | ||
564e31c4 | 923 | int lxc_terminal_setup(struct lxc_conf *conf) |
5777fe90 CB |
924 | { |
925 | int ret; | |
dcad02f8 | 926 | struct lxc_terminal *terminal = &conf->console; |
5777fe90 | 927 | |
1a443ac1 CB |
928 | if (terminal->path && strcmp(terminal->path, "none") == 0) { |
929 | INFO("No terminal requested"); | |
5777fe90 CB |
930 | return 0; |
931 | } | |
932 | ||
96eee564 | 933 | ret = lxc_terminal_create(terminal); |
5777fe90 CB |
934 | if (ret < 0) |
935 | return -1; | |
936 | ||
2083d59d | 937 | ret = lxc_terminal_create_log_file(terminal); |
a0309168 CB |
938 | if (ret < 0) |
939 | goto err; | |
940 | ||
2083d59d | 941 | ret = lxc_terminal_create_ringbuf(terminal); |
a0309168 CB |
942 | if (ret < 0) |
943 | goto err; | |
b5159817 DE |
944 | |
945 | return 0; | |
946 | ||
947 | err: | |
2083d59d | 948 | lxc_terminal_delete(terminal); |
69629c82 | 949 | return -ENODEV; |
b5159817 DE |
950 | } |
951 | ||
8ca7b374 CB |
952 | static bool __terminal_dup2(int duplicate, int original) |
953 | { | |
954 | int ret; | |
955 | ||
956 | if (!isatty(original)) | |
957 | return true; | |
958 | ||
959 | ret = dup2(duplicate, original); | |
960 | if (ret < 0) { | |
961 | SYSERROR("Failed to dup2(%d, %d)", duplicate, original); | |
962 | return false; | |
963 | } | |
964 | ||
965 | return true; | |
966 | } | |
967 | ||
ae6d3913 | 968 | int lxc_terminal_set_stdfds(int fd) |
0d9acb99 | 969 | { |
8ca7b374 CB |
970 | int i; |
971 | ||
39a78bbe | 972 | if (fd < 0) |
0d9acb99 | 973 | return 0; |
b5159817 | 974 | |
8ca7b374 CB |
975 | for (i = 0; i < 3; i++) |
976 | if (!__terminal_dup2(fd, (int[]){STDIN_FILENO, STDOUT_FILENO, | |
977 | STDERR_FILENO}[i])) | |
39a78bbe | 978 | return -1; |
39a78bbe | 979 | |
0d9acb99 DE |
980 | return 0; |
981 | } | |
b5159817 | 982 | |
52f9292f | 983 | int lxc_terminal_stdin_cb(int fd, uint32_t events, void *cbdata, |
15085292 | 984 | struct lxc_epoll_descr *descr) |
b5159817 | 985 | { |
15085292 | 986 | int ret; |
b5159817 | 987 | char c; |
15085292 | 988 | struct lxc_terminal_state *ts = cbdata; |
b5159817 | 989 | |
97bc2422 | 990 | if (fd != ts->stdinfd) |
a529bc25 | 991 | return LXC_MAINLOOP_CLOSE; |
97bc2422 | 992 | |
15085292 CB |
993 | ret = lxc_read_nointr(ts->stdinfd, &c, 1); |
994 | if (ret <= 0) | |
a529bc25 | 995 | return LXC_MAINLOOP_CLOSE; |
63376d7d | 996 | |
525e2117 | 997 | if (ts->escape >= 1) { |
2083d59d | 998 | /* we want to exit the terminal with Ctrl+a q */ |
014d5e1e CB |
999 | if (c == ts->escape && !ts->saw_escape) { |
1000 | ts->saw_escape = 1; | |
15085292 | 1001 | return LXC_MAINLOOP_CONTINUE; |
014d5e1e | 1002 | } |
5c294060 | 1003 | |
014d5e1e | 1004 | if (c == 'q' && ts->saw_escape) |
a529bc25 | 1005 | return LXC_MAINLOOP_CLOSE; |
014d5e1e CB |
1006 | |
1007 | ts->saw_escape = 0; | |
1008 | } | |
63376d7d | 1009 | |
15085292 CB |
1010 | ret = lxc_write_nointr(ts->masterfd, &c, 1); |
1011 | if (ret <= 0) | |
a529bc25 | 1012 | return LXC_MAINLOOP_CLOSE; |
b5159817 | 1013 | |
15085292 | 1014 | return LXC_MAINLOOP_CONTINUE; |
63376d7d DL |
1015 | } |
1016 | ||
ee9102ff CB |
1017 | int lxc_terminal_master_cb(int fd, uint32_t events, void *cbdata, |
1018 | struct lxc_epoll_descr *descr) | |
63376d7d | 1019 | { |
0d4137cc | 1020 | int r, w; |
5bd171bd CB |
1021 | char buf[LXC_TERMINAL_BUFFER_SIZE]; |
1022 | struct lxc_terminal_state *ts = cbdata; | |
63376d7d | 1023 | |
97bc2422 | 1024 | if (fd != ts->masterfd) |
a529bc25 | 1025 | return LXC_MAINLOOP_CLOSE; |
97bc2422 | 1026 | |
e66b6c96 CB |
1027 | r = lxc_read_nointr(fd, buf, sizeof(buf)); |
1028 | if (r <= 0) | |
a529bc25 | 1029 | return LXC_MAINLOOP_CLOSE; |
1560f6c9 | 1030 | |
e66b6c96 | 1031 | w = lxc_write_nointr(ts->stdoutfd, buf, r); |
5bd171bd | 1032 | if (w <= 0 || w != r) |
a529bc25 | 1033 | return LXC_MAINLOOP_CLOSE; |
f78a1f32 | 1034 | |
5bd171bd | 1035 | return LXC_MAINLOOP_CONTINUE; |
b5159817 DE |
1036 | } |
1037 | ||
c86e2584 | 1038 | int lxc_terminal_getfd(struct lxc_container *c, int *ttynum, int *masterfd) |
b5159817 DE |
1039 | { |
1040 | return lxc_cmd_console(c->name, ttynum, masterfd, c->config_path); | |
1041 | } | |
1042 | ||
1043 | int lxc_console(struct lxc_container *c, int ttynum, | |
1044 | int stdinfd, int stdoutfd, int stderrfd, | |
1045 | int escape) | |
1046 | { | |
71ac3f07 | 1047 | int masterfd, ret, ttyfd; |
b5159817 DE |
1048 | struct lxc_epoll_descr descr; |
1049 | struct termios oldtios; | |
5b55021f | 1050 | struct lxc_terminal_state *ts; |
25964232 | 1051 | int istty = 0; |
b5159817 | 1052 | |
b5159817 | 1053 | ttyfd = lxc_cmd_console(c->name, &ttynum, &masterfd, c->config_path); |
6834f805 CB |
1054 | if (ttyfd < 0) |
1055 | return -1; | |
b5159817 DE |
1056 | |
1057 | ret = setsid(); | |
33b4b411 CB |
1058 | if (ret < 0) |
1059 | TRACE("Process is already group leader"); | |
b5159817 | 1060 | |
dc8c7883 | 1061 | ts = lxc_terminal_signal_init(stdinfd, masterfd); |
b5159817 DE |
1062 | if (!ts) { |
1063 | ret = -1; | |
33b4b411 | 1064 | goto close_fds; |
b5159817 DE |
1065 | } |
1066 | ts->escape = escape; | |
1067 | ts->winch_proxy = c->name; | |
1068 | ts->winch_proxy_lxcpath = c->config_path; | |
3b975060 | 1069 | ts->stdoutfd = stdoutfd; |
b5159817 | 1070 | |
6834f805 | 1071 | istty = isatty(stdinfd); |
25964232 | 1072 | if (istty) { |
4e9c0330 | 1073 | lxc_terminal_winsz(stdinfd, masterfd); |
8ccbbf94 | 1074 | lxc_cmd_terminal_winch(ts->winch_proxy, ts->winch_proxy_lxcpath); |
6834f805 | 1075 | } else { |
71ac3f07 | 1076 | INFO("File descriptor %d does not refer to a terminal", stdinfd); |
25964232 | 1077 | } |
b5159817 DE |
1078 | |
1079 | ret = lxc_mainloop_open(&descr); | |
1080 | if (ret) { | |
33b4b411 CB |
1081 | ERROR("Failed to create mainloop"); |
1082 | goto sigwinch_fini; | |
b5159817 DE |
1083 | } |
1084 | ||
341c2aed CB |
1085 | if (ts->sigfd != -1) { |
1086 | ret = lxc_mainloop_add_handler(&descr, ts->sigfd, | |
9bafc8cb | 1087 | lxc_terminal_signalfd_cb, ts); |
33b4b411 | 1088 | if (ret < 0) { |
0519b5cc | 1089 | ERROR("Failed to add signal handler to mainloop"); |
33b4b411 | 1090 | goto close_mainloop; |
341c2aed | 1091 | } |
b5159817 DE |
1092 | } |
1093 | ||
1094 | ret = lxc_mainloop_add_handler(&descr, ts->stdinfd, | |
52f9292f | 1095 | lxc_terminal_stdin_cb, ts); |
33b4b411 CB |
1096 | if (ret < 0) { |
1097 | ERROR("Failed to add stdin handler"); | |
1098 | goto close_mainloop; | |
b5159817 DE |
1099 | } |
1100 | ||
1101 | ret = lxc_mainloop_add_handler(&descr, ts->masterfd, | |
ee9102ff | 1102 | lxc_terminal_master_cb, ts); |
33b4b411 CB |
1103 | if (ret < 0) { |
1104 | ERROR("Failed to add master handler"); | |
1105 | goto close_mainloop; | |
b5159817 DE |
1106 | } |
1107 | ||
686df166 CB |
1108 | if (ts->escape >= 1) { |
1109 | fprintf(stderr, | |
1110 | "\n" | |
6834f805 CB |
1111 | "Connected to tty %1$d\n" |
1112 | "Type <Ctrl+%2$c q> to exit the console, " | |
1113 | "<Ctrl+%2$c Ctrl+%2$c> to enter Ctrl+%2$c itself\n", | |
1114 | ttynum, 'a' + escape - 1); | |
686df166 | 1115 | } |
6834f805 CB |
1116 | |
1117 | if (istty) { | |
1118 | ret = lxc_setup_tios(stdinfd, &oldtios); | |
1119 | if (ret < 0) | |
1120 | goto close_mainloop; | |
1121 | } | |
1122 | ||
025ed0f3 | 1123 | ret = lxc_mainloop(&descr, -1); |
33b4b411 CB |
1124 | if (ret < 0) { |
1125 | ERROR("The mainloop returned an error"); | |
6834f805 | 1126 | goto restore_tios; |
b5159817 DE |
1127 | } |
1128 | ||
1129 | ret = 0; | |
1130 | ||
6834f805 CB |
1131 | restore_tios: |
1132 | if (istty) { | |
1133 | istty = tcsetattr(stdinfd, TCSAFLUSH, &oldtios); | |
1134 | if (istty < 0) | |
a24c5678 | 1135 | SYSWARN("Failed to restore terminal properties"); |
6834f805 CB |
1136 | } |
1137 | ||
33b4b411 | 1138 | close_mainloop: |
b5159817 | 1139 | lxc_mainloop_close(&descr); |
33b4b411 CB |
1140 | |
1141 | sigwinch_fini: | |
a8867251 | 1142 | lxc_terminal_signal_fini(ts); |
33b4b411 CB |
1143 | |
1144 | close_fds: | |
b5159817 DE |
1145 | close(masterfd); |
1146 | close(ttyfd); | |
33b4b411 | 1147 | |
b5159817 | 1148 | return ret; |
63376d7d | 1149 | } |
e98affda | 1150 | |
cd0a2b2f | 1151 | int lxc_make_controlling_terminal(int fd) |
e98affda CB |
1152 | { |
1153 | int ret; | |
1154 | ||
1155 | setsid(); | |
1156 | ||
1157 | ret = ioctl(fd, TIOCSCTTY, (char *)NULL); | |
1158 | if (ret < 0) | |
1159 | return -1; | |
1160 | ||
1161 | return 0; | |
1162 | } | |
1163 | ||
d049f0e9 | 1164 | int lxc_terminal_prepare_login(int fd) |
e98affda CB |
1165 | { |
1166 | int ret; | |
1167 | ||
cd0a2b2f | 1168 | ret = lxc_make_controlling_terminal(fd); |
e98affda CB |
1169 | if (ret < 0) |
1170 | return -1; | |
1171 | ||
ae6d3913 | 1172 | ret = lxc_terminal_set_stdfds(fd); |
e98affda CB |
1173 | if (ret < 0) |
1174 | return -1; | |
1175 | ||
1176 | if (fd > STDERR_FILENO) | |
1177 | close(fd); | |
1178 | ||
1179 | return 0; | |
1180 | } | |
1181 | ||
e9a55b51 | 1182 | void lxc_terminal_info_init(struct lxc_terminal_info *terminal) |
e98affda | 1183 | { |
e9a55b51 CB |
1184 | terminal->name[0] = '\0'; |
1185 | terminal->master = -EBADF; | |
1186 | terminal->slave = -EBADF; | |
1187 | terminal->busy = -1; | |
e98affda CB |
1188 | } |
1189 | ||
e9a55b51 | 1190 | void lxc_terminal_init(struct lxc_terminal *terminal) |
e98affda | 1191 | { |
e9a55b51 CB |
1192 | memset(terminal, 0, sizeof(*terminal)); |
1193 | terminal->slave = -EBADF; | |
1194 | terminal->master = -EBADF; | |
1195 | terminal->peer = -EBADF; | |
1196 | terminal->log_fd = -EBADF; | |
1197 | lxc_terminal_info_init(&terminal->proxy); | |
e98affda CB |
1198 | } |
1199 | ||
dcad02f8 | 1200 | void lxc_terminal_conf_free(struct lxc_terminal *terminal) |
e98affda | 1201 | { |
2083d59d CB |
1202 | free(terminal->log_path); |
1203 | free(terminal->path); | |
1204 | if (terminal->buffer_size > 0 && terminal->ringbuf.addr) | |
1205 | lxc_ringbuf_release(&terminal->ringbuf); | |
e98affda | 1206 | } |
7cfeddd7 | 1207 | |
03700cab | 1208 | int lxc_terminal_map_ids(struct lxc_conf *c, struct lxc_terminal *terminal) |
7cfeddd7 CB |
1209 | { |
1210 | int ret; | |
1211 | ||
1212 | if (lxc_list_empty(&c->id_map)) | |
1213 | return 0; | |
1214 | ||
03700cab | 1215 | if (strcmp(terminal->name, "") == 0) |
7cfeddd7 CB |
1216 | return 0; |
1217 | ||
03700cab | 1218 | ret = chown_mapped_root(terminal->name, c); |
7cfeddd7 | 1219 | if (ret < 0) { |
03700cab | 1220 | ERROR("Failed to chown terminal \"%s\"", terminal->name); |
7cfeddd7 CB |
1221 | return -1; |
1222 | } | |
1223 | ||
03700cab | 1224 | TRACE("Chowned terminal \"%s\"", terminal->name); |
7cfeddd7 CB |
1225 | |
1226 | return 0; | |
1227 | } |