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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 | ||
9d465140 | 24 | #define _GNU_SOURCE |
9395937a CB |
25 | #include <errno.h> |
26 | #include <fcntl.h> | |
e62912bd | 27 | #include <lxc/lxccontainer.h> |
b467714b | 28 | #include <pthread.h> |
b5159817 | 29 | #include <signal.h> |
b0a33c1e | 30 | #include <stdio.h> |
e0dc0de7 | 31 | #include <stdlib.h> |
da41561c CB |
32 | #include <sys/epoll.h> |
33 | #include <sys/types.h> | |
e62912bd CB |
34 | #include <termios.h> |
35 | #include <unistd.h> | |
f2363e38 | 36 | |
9395937a CB |
37 | #include "af_unix.h" |
38 | #include "caps.h" | |
39 | #include "commands.h" | |
00dbc43e | 40 | #include "conf.h" |
e827ff7e | 41 | #include "config.h" |
9395937a | 42 | #include "log.h" |
b5159817 | 43 | #include "lxclock.h" |
9395937a | 44 | #include "mainloop.h" |
e62912bd | 45 | #include "start.h" |
0ed9b1bc | 46 | #include "terminal.h" |
b5159817 | 47 | #include "utils.h" |
36eb9bde | 48 | |
e827ff7e SG |
49 | #if HAVE_PTY_H |
50 | #include <pty.h> | |
51 | #else | |
52 | #include <../include/openpty.h> | |
53 | #endif | |
54 | ||
de708fb7 | 55 | #define LXC_TERMINAL_BUFFER_SIZE 1024 |
732375f5 | 56 | |
2083d59d | 57 | lxc_log_define(terminal, lxc); |
36eb9bde | 58 | |
b5159817 | 59 | static struct lxc_list lxc_ttys; |
724e753c | 60 | |
b5159817 | 61 | typedef void (*sighandler_t)(int); |
b5159817 | 62 | |
fc26f086 | 63 | __attribute__((constructor)) void lxc_terminal_init_global(void) |
b5159817 DE |
64 | { |
65 | lxc_list_init(&lxc_ttys); | |
66 | } | |
724e753c | 67 | |
4e9c0330 | 68 | void lxc_terminal_winsz(int srcfd, int dstfd) |
b5159817 | 69 | { |
0519b5cc | 70 | int ret; |
b5159817 | 71 | struct winsize wsz; |
0519b5cc CB |
72 | |
73 | if (!isatty(srcfd)) | |
74 | return; | |
75 | ||
76 | ret = ioctl(srcfd, TIOCGWINSZ, &wsz); | |
77 | if (ret < 0) { | |
78 | WARN("Failed to get window size"); | |
79 | return; | |
724e753c | 80 | } |
0519b5cc CB |
81 | |
82 | ret = ioctl(dstfd, TIOCSWINSZ, &wsz); | |
83 | if (ret < 0) | |
84 | WARN("Failed to set window size"); | |
85 | else | |
86 | DEBUG("Set window size to %d columns and %d rows", wsz.ws_col, | |
87 | wsz.ws_row); | |
88 | ||
89 | return; | |
b5159817 | 90 | } |
724e753c | 91 | |
5b55021f | 92 | static void lxc_terminal_winch(struct lxc_terminal_state *ts) |
b5159817 | 93 | { |
4e9c0330 | 94 | lxc_terminal_winsz(ts->stdinfd, ts->masterfd); |
0519b5cc | 95 | |
0d4137cc | 96 | if (ts->winch_proxy) |
8ccbbf94 | 97 | lxc_cmd_terminal_winch(ts->winch_proxy, ts->winch_proxy_lxcpath); |
724e753c MN |
98 | } |
99 | ||
dad4a039 | 100 | void lxc_terminal_sigwinch(int sig) |
cd453b38 | 101 | { |
025ed0f3 | 102 | struct lxc_list *it; |
5b55021f | 103 | struct lxc_terminal_state *ts; |
cd453b38 | 104 | |
025ed0f3 SH |
105 | lxc_list_for_each(it, &lxc_ttys) { |
106 | ts = it->elem; | |
7a10164a | 107 | lxc_terminal_winch(ts); |
cd453b38 | 108 | } |
b5159817 | 109 | } |
cd453b38 | 110 | |
9bafc8cb CB |
111 | int lxc_terminal_signalfd_cb(int fd, uint32_t events, void *cbdata, |
112 | struct lxc_epoll_descr *descr) | |
b5159817 | 113 | { |
1349e92e | 114 | ssize_t ret; |
b5159817 | 115 | struct signalfd_siginfo siginfo; |
5b55021f | 116 | struct lxc_terminal_state *ts = cbdata; |
b5159817 | 117 | |
1349e92e | 118 | ret = read(fd, &siginfo, sizeof(siginfo)); |
0d4137cc | 119 | if (ret < 0 || (size_t)ret < sizeof(siginfo)) { |
0519b5cc | 120 | ERROR("Failed to read signal info"); |
2e943b7b | 121 | return LXC_MAINLOOP_ERROR; |
cd453b38 DL |
122 | } |
123 | ||
1349e92e | 124 | if (siginfo.ssi_signo == SIGTERM) { |
9bafc8cb | 125 | DEBUG("Received SIGTERM. Detaching from the terminal"); |
a529bc25 | 126 | return LXC_MAINLOOP_CLOSE; |
1349e92e CB |
127 | } |
128 | ||
129 | if (siginfo.ssi_signo == SIGWINCH) | |
7a10164a | 130 | lxc_terminal_winch(ts); |
1349e92e | 131 | |
2e943b7b | 132 | return LXC_MAINLOOP_CONTINUE; |
b5159817 DE |
133 | } |
134 | ||
5b55021f | 135 | struct lxc_terminal_state *lxc_terminal_signal_init(int srcfd, int dstfd) |
b5159817 | 136 | { |
1349e92e | 137 | int ret; |
b6d5de95 | 138 | bool istty = false; |
b5159817 | 139 | sigset_t mask; |
5b55021f | 140 | struct lxc_terminal_state *ts; |
b5159817 DE |
141 | |
142 | ts = malloc(sizeof(*ts)); | |
143 | if (!ts) | |
144 | return NULL; | |
145 | ||
146 | memset(ts, 0, sizeof(*ts)); | |
341c2aed | 147 | ts->stdinfd = srcfd; |
b5159817 | 148 | ts->masterfd = dstfd; |
341c2aed | 149 | ts->sigfd = -1; |
b5159817 | 150 | |
b6d5de95 CB |
151 | ret = sigemptyset(&mask); |
152 | if (ret < 0) { | |
153 | SYSERROR("Failed to initialize an empty signal set"); | |
154 | goto on_error; | |
155 | } | |
1349e92e | 156 | |
b6d5de95 | 157 | istty = (isatty(srcfd) == 1); |
0519b5cc | 158 | if (!istty) { |
25964232 | 159 | INFO("fd %d does not refer to a tty device", srcfd); |
1349e92e CB |
160 | } else { |
161 | /* Add tty to list to be scanned at SIGWINCH time. */ | |
162 | lxc_list_add_elem(&ts->node, ts); | |
163 | lxc_list_add_tail(&lxc_ttys, &ts->node); | |
b6d5de95 CB |
164 | ret = sigaddset(&mask, SIGWINCH); |
165 | if (ret < 0) | |
166 | NOTICE("%s - Failed to add SIGWINCH to signal set", | |
167 | strerror(errno)); | |
25964232 LF |
168 | } |
169 | ||
1349e92e | 170 | /* Exit the mainloop cleanly on SIGTERM. */ |
b6d5de95 CB |
171 | ret = sigaddset(&mask, SIGTERM); |
172 | if (ret < 0) { | |
173 | SYSERROR("Failed to add SIGWINCH to signal set"); | |
174 | goto on_error; | |
175 | } | |
b5159817 | 176 | |
b467714b | 177 | ret = pthread_sigmask(SIG_BLOCK, &mask, &ts->oldmask); |
1349e92e CB |
178 | if (ret < 0) { |
179 | WARN("Failed to block signals"); | |
180 | goto on_error; | |
b5159817 DE |
181 | } |
182 | ||
dc5f6125 | 183 | ts->sigfd = signalfd(-1, &mask, SFD_CLOEXEC); |
b5159817 | 184 | if (ts->sigfd < 0) { |
1349e92e | 185 | WARN("Failed to create signal fd"); |
b467714b | 186 | (void)pthread_sigmask(SIG_SETMASK, &ts->oldmask, NULL); |
1349e92e | 187 | goto on_error; |
b5159817 DE |
188 | } |
189 | ||
1349e92e CB |
190 | DEBUG("Created signal fd %d", ts->sigfd); |
191 | return ts; | |
192 | ||
193 | on_error: | |
194 | ERROR("Failed to create signal fd"); | |
195 | if (ts->sigfd >= 0) { | |
196 | close(ts->sigfd); | |
197 | ts->sigfd = -1; | |
198 | } | |
b6d5de95 | 199 | |
1349e92e CB |
200 | if (istty) |
201 | lxc_list_del(&ts->node); | |
b6d5de95 | 202 | |
b5159817 | 203 | return ts; |
cd453b38 DL |
204 | } |
205 | ||
5b55021f | 206 | void lxc_terminal_signal_fini(struct lxc_terminal_state *ts) |
63376d7d | 207 | { |
0e6da90b | 208 | if (ts->sigfd >= 0) { |
b5159817 | 209 | close(ts->sigfd); |
1349e92e | 210 | |
b467714b | 211 | if (pthread_sigmask(SIG_SETMASK, &ts->oldmask, NULL) < 0) |
1349e92e | 212 | WARN("%s - Failed to restore signal mask", strerror(errno)); |
0e6da90b | 213 | } |
0d4137cc | 214 | |
1349e92e CB |
215 | if (isatty(ts->stdinfd)) |
216 | lxc_list_del(&ts->node); | |
217 | ||
b5159817 DE |
218 | free(ts); |
219 | } | |
1560f6c9 | 220 | |
99a04585 | 221 | static int lxc_terminal_truncate_log_file(struct lxc_terminal *terminal) |
861813e5 CB |
222 | { |
223 | /* be very certain things are kosher */ | |
2083d59d | 224 | if (!terminal->log_path || terminal->log_fd < 0) |
861813e5 CB |
225 | return -EBADF; |
226 | ||
2083d59d | 227 | return lxc_unpriv(ftruncate(terminal->log_fd, 0)); |
861813e5 CB |
228 | } |
229 | ||
468724d3 | 230 | static int lxc_terminal_rotate_log_file(struct lxc_terminal *terminal) |
861813e5 CB |
231 | { |
232 | int ret; | |
233 | size_t len; | |
234 | char *tmp; | |
235 | ||
99a04585 | 236 | if (!terminal->log_path || terminal->log_rotate == 0) |
861813e5 CB |
237 | return -EOPNOTSUPP; |
238 | ||
239 | /* be very certain things are kosher */ | |
99a04585 | 240 | if (terminal->log_fd < 0) |
861813e5 CB |
241 | return -EBADF; |
242 | ||
99a04585 | 243 | len = strlen(terminal->log_path) + sizeof(".1"); |
861813e5 CB |
244 | tmp = alloca(len); |
245 | ||
99a04585 | 246 | ret = snprintf(tmp, len, "%s.1", terminal->log_path); |
861813e5 CB |
247 | if (ret < 0 || (size_t)ret >= len) |
248 | return -EFBIG; | |
249 | ||
99a04585 CB |
250 | close(terminal->log_fd); |
251 | terminal->log_fd = -1; | |
252 | ret = lxc_unpriv(rename(terminal->log_path, tmp)); | |
861813e5 CB |
253 | if (ret < 0) |
254 | return ret; | |
255 | ||
99a04585 | 256 | return lxc_terminal_create_log_file(terminal); |
861813e5 CB |
257 | } |
258 | ||
a44ae1a9 | 259 | static int lxc_terminal_write_log_file(struct lxc_terminal *terminal, char *buf, |
8903fb08 | 260 | int bytes_read) |
861813e5 CB |
261 | { |
262 | int ret; | |
861813e5 | 263 | struct stat st; |
8903fb08 | 264 | int64_t space_left = -1; |
861813e5 | 265 | |
99a04585 | 266 | if (terminal->log_fd < 0) |
861813e5 CB |
267 | return 0; |
268 | ||
269 | /* A log size <= 0 means that there's no limit on the size of the log | |
270 | * file at which point we simply ignore whether the log is supposed to | |
271 | * be rotated or not. | |
272 | */ | |
99a04585 CB |
273 | if (terminal->log_size <= 0) |
274 | return lxc_write_nointr(terminal->log_fd, buf, bytes_read); | |
861813e5 CB |
275 | |
276 | /* Get current size of the log file. */ | |
99a04585 | 277 | ret = fstat(terminal->log_fd, &st); |
861813e5 | 278 | if (ret < 0) { |
99a04585 | 279 | SYSERROR("Failed to stat the terminal log file descriptor"); |
861813e5 CB |
280 | return -1; |
281 | } | |
282 | ||
283 | /* handle non-regular files */ | |
284 | if ((st.st_mode & S_IFMT) != S_IFREG) { | |
285 | /* This isn't a regular file. so rotating the file seems a | |
286 | * dangerous thing to do, size limits are also very | |
287 | * questionable. Let's not risk anything and tell the user that | |
288 | * he's requesting us to do weird stuff. | |
289 | */ | |
99a04585 | 290 | if (terminal->log_rotate > 0 || terminal->log_size > 0) |
861813e5 CB |
291 | return -EINVAL; |
292 | ||
293 | /* I mean, sure log wherever you want to. */ | |
99a04585 | 294 | return lxc_write_nointr(terminal->log_fd, buf, bytes_read); |
861813e5 CB |
295 | } |
296 | ||
99a04585 | 297 | space_left = terminal->log_size - st.st_size; |
861813e5 CB |
298 | |
299 | /* User doesn't want to rotate the log file and there's no more space | |
300 | * left so simply truncate it. | |
301 | */ | |
99a04585 CB |
302 | if (space_left <= 0 && terminal->log_rotate <= 0) { |
303 | ret = lxc_terminal_truncate_log_file(terminal); | |
861813e5 CB |
304 | if (ret < 0) |
305 | return ret; | |
306 | ||
99a04585 CB |
307 | if (bytes_read <= terminal->log_size) |
308 | return lxc_write_nointr(terminal->log_fd, buf, bytes_read); | |
861813e5 CB |
309 | |
310 | /* Write as much as we can into the buffer and loose the rest. */ | |
99a04585 | 311 | return lxc_write_nointr(terminal->log_fd, buf, terminal->log_size); |
861813e5 CB |
312 | } |
313 | ||
314 | /* There's enough space left. */ | |
315 | if (bytes_read <= space_left) | |
99a04585 | 316 | return lxc_write_nointr(terminal->log_fd, buf, bytes_read); |
861813e5 CB |
317 | |
318 | /* There's not enough space left but at least write as much as we can | |
319 | * into the old log file. | |
320 | */ | |
99a04585 | 321 | ret = lxc_write_nointr(terminal->log_fd, buf, space_left); |
861813e5 CB |
322 | if (ret < 0) |
323 | return -1; | |
324 | ||
325 | /* Calculate how many bytes we still need to write. */ | |
326 | bytes_read -= space_left; | |
327 | ||
89962c6c | 328 | /* There'd be more to write but we aren't instructed to rotate the log |
861813e5 CB |
329 | * file so simply return. There's no error on our side here. |
330 | */ | |
99a04585 | 331 | if (terminal->log_rotate > 0) |
468724d3 | 332 | ret = lxc_terminal_rotate_log_file(terminal); |
861813e5 | 333 | else |
99a04585 | 334 | ret = lxc_terminal_truncate_log_file(terminal); |
861813e5 CB |
335 | if (ret < 0) |
336 | return ret; | |
337 | ||
99a04585 | 338 | if (terminal->log_size < bytes_read) { |
861813e5 CB |
339 | /* Well, this is unfortunate because it means that there is more |
340 | * to write than the user has granted us space. There are | |
341 | * multiple ways to handle this but let's use the simplest one: | |
342 | * write as much as we can, tell the user that there was more | |
343 | * stuff to write and move on. | |
344 | * Note that this scenario shouldn't actually happen with the | |
99a04585 | 345 | * standard pty-based terminal that LXC allocates since it will |
861813e5 CB |
346 | * be switched into raw mode. In raw mode only 1 byte at a time |
347 | * should be read and written. | |
348 | */ | |
99a04585 CB |
349 | WARN("Size of terminal log file is smaller than the bytes to write"); |
350 | ret = lxc_write_nointr(terminal->log_fd, buf, terminal->log_size); | |
861813e5 CB |
351 | if (ret < 0) |
352 | return -1; | |
353 | bytes_read -= ret; | |
354 | return bytes_read; | |
355 | } | |
356 | ||
357 | /* Yay, we made it. */ | |
99a04585 | 358 | ret = lxc_write_nointr(terminal->log_fd, buf, bytes_read); |
861813e5 CB |
359 | if (ret < 0) |
360 | return -1; | |
361 | bytes_read -= ret; | |
362 | return bytes_read; | |
363 | } | |
364 | ||
de708fb7 | 365 | int lxc_terminal_io_cb(int fd, uint32_t events, void *data, |
a529bc25 | 366 | struct lxc_epoll_descr *descr) |
b5159817 | 367 | { |
dcad02f8 | 368 | struct lxc_terminal *terminal = data; |
de708fb7 | 369 | char buf[LXC_TERMINAL_BUFFER_SIZE]; |
732375f5 | 370 | int r, w, w_log, w_rbuf; |
e0dc0de7 | 371 | |
3e6580ec CB |
372 | w = r = lxc_read_nointr(fd, buf, sizeof(buf)); |
373 | if (r <= 0) { | |
de708fb7 | 374 | INFO("Terminal client on fd %d has exited", fd); |
b5159817 | 375 | lxc_mainloop_del_handler(descr, fd); |
c06a0555 | 376 | |
de708fb7 CB |
377 | if (fd == terminal->master) { |
378 | terminal->master = -EBADF; | |
379 | } else if (fd == terminal->peer) { | |
380 | if (terminal->tty_state) { | |
381 | lxc_terminal_signal_fini(terminal->tty_state); | |
382 | terminal->tty_state = NULL; | |
0b1e242b | 383 | } |
de708fb7 | 384 | terminal->peer = -EBADF; |
c06a0555 CB |
385 | } else { |
386 | ERROR("Handler received unexpected file descriptor"); | |
0b1e242b | 387 | } |
b5159817 | 388 | close(fd); |
c06a0555 | 389 | |
a529bc25 | 390 | return LXC_MAINLOOP_CLOSE; |
33fcb7a0 | 391 | } |
63376d7d | 392 | |
de708fb7 CB |
393 | if (fd == terminal->peer) |
394 | w = lxc_write_nointr(terminal->master, buf, r); | |
b5159817 | 395 | |
732375f5 | 396 | w_rbuf = w_log = 0; |
de708fb7 | 397 | if (fd == terminal->master) { |
732375f5 | 398 | /* write to peer first */ |
de708fb7 CB |
399 | if (terminal->peer >= 0) |
400 | w = lxc_write_nointr(terminal->peer, buf, r); | |
732375f5 | 401 | |
de708fb7 CB |
402 | /* write to terminal ringbuffer */ |
403 | if (terminal->buffer_size > 0) | |
404 | w_rbuf = lxc_ringbuf_write(&terminal->ringbuf, buf, r); | |
861813e5 | 405 | |
de708fb7 CB |
406 | /* write to terminal log */ |
407 | if (terminal->log_fd >= 0) | |
a44ae1a9 | 408 | w_log = lxc_terminal_write_log_file(terminal, buf, r); |
63376d7d DL |
409 | } |
410 | ||
b5159817 | 411 | if (w != r) |
de708fb7 | 412 | WARN("Short write on terminal r:%d != w:%d", r, w); |
732375f5 CB |
413 | |
414 | if (w_rbuf < 0) | |
de708fb7 | 415 | TRACE("%s - Failed to write %d bytes to terminal ringbuffer", |
732375f5 CB |
416 | strerror(-w_rbuf), r); |
417 | ||
418 | if (w_log < 0) | |
de708fb7 | 419 | TRACE("Failed to write %d bytes to terminal log", r); |
0d4137cc | 420 | |
2b8bf299 | 421 | return LXC_MAINLOOP_CONTINUE; |
b5159817 DE |
422 | } |
423 | ||
dcad02f8 | 424 | static int lxc_terminal_mainloop_add_peer(struct lxc_terminal *terminal) |
b5159817 | 425 | { |
a529bc25 CB |
426 | int ret; |
427 | ||
2083d59d CB |
428 | if (terminal->peer >= 0) { |
429 | ret = lxc_mainloop_add_handler(terminal->descr, terminal->peer, | |
430 | lxc_terminal_io_cb, terminal); | |
a529bc25 | 431 | if (ret < 0) { |
2083d59d | 432 | WARN("Failed to add terminal peer handler to mainloop"); |
a529bc25 CB |
433 | return -1; |
434 | } | |
63376d7d DL |
435 | } |
436 | ||
2083d59d | 437 | if (!terminal->tty_state || terminal->tty_state->sigfd < 0) |
a529bc25 CB |
438 | return 0; |
439 | ||
2083d59d CB |
440 | ret = lxc_mainloop_add_handler(terminal->descr, terminal->tty_state->sigfd, |
441 | lxc_terminal_signalfd_cb, terminal->tty_state); | |
a529bc25 CB |
442 | if (ret < 0) { |
443 | WARN("Failed to add signal handler to mainloop"); | |
444 | return -1; | |
b5159817 | 445 | } |
a529bc25 CB |
446 | |
447 | return 0; | |
b5159817 DE |
448 | } |
449 | ||
093bce5f | 450 | int lxc_terminal_mainloop_add(struct lxc_epoll_descr *descr, |
ea5b3c23 | 451 | struct lxc_terminal *terminal) |
b5159817 | 452 | { |
a529bc25 | 453 | int ret; |
b5159817 | 454 | |
2083d59d CB |
455 | if (terminal->master < 0) { |
456 | INFO("Terminal is not initialized"); | |
b5159817 | 457 | return 0; |
596a818d DE |
458 | } |
459 | ||
2083d59d CB |
460 | ret = lxc_mainloop_add_handler(descr, terminal->master, |
461 | lxc_terminal_io_cb, terminal); | |
30a33fbd | 462 | if (ret < 0) { |
ea5b3c23 CB |
463 | ERROR("Failed to add handler for terminal master fd %d to " |
464 | "mainloop", terminal->master); | |
b5159817 | 465 | return -1; |
28a4b0e5 DL |
466 | } |
467 | ||
30a33fbd | 468 | /* We cache the descr so that we can add an fd to it when someone |
c1ee47cd | 469 | * does attach to it in lxc_terminal_allocate(). |
b5159817 | 470 | */ |
2083d59d | 471 | terminal->descr = descr; |
cd453b38 | 472 | |
ea5b3c23 | 473 | return lxc_terminal_mainloop_add_peer(terminal); |
b5159817 | 474 | } |
28a4b0e5 | 475 | |
0d4137cc | 476 | int lxc_setup_tios(int fd, struct termios *oldtios) |
b5159817 | 477 | { |
e4953e62 | 478 | int ret; |
b5159817 | 479 | struct termios newtios; |
e0dc0de7 | 480 | |
b5159817 | 481 | if (!isatty(fd)) { |
e4953e62 | 482 | ERROR("File descriptor %d does not refert to a terminal", fd); |
b5159817 | 483 | return -1; |
e0dc0de7 DL |
484 | } |
485 | ||
e4953e62 CB |
486 | /* Get current termios. */ |
487 | ret = tcgetattr(fd, oldtios); | |
488 | if (ret < 0) { | |
489 | SYSERROR("Failed to get current terminal settings"); | |
b5159817 | 490 | return -1; |
e0dc0de7 DL |
491 | } |
492 | ||
4dc96430 TJ |
493 | /* ensure we don't end up in an endless loop: |
494 | * The kernel might fire SIGTTOU while an | |
495 | * ioctl() in tcsetattr() is executed. When the ioctl() | |
496 | * is resumed and retries, the signal handler interrupts it again. | |
497 | */ | |
498 | signal (SIGTTIN, SIG_IGN); | |
499 | signal (SIGTTOU, SIG_IGN); | |
500 | ||
b5159817 | 501 | newtios = *oldtios; |
e0dc0de7 | 502 | |
a7c97a40 CB |
503 | /* We use the same settings that ssh does. */ |
504 | newtios.c_iflag |= IGNPAR; | |
505 | newtios.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF); | |
506 | #ifdef IUCLC | |
507 | newtios.c_iflag &= ~IUCLC; | |
508 | #endif | |
4dc96430 | 509 | newtios.c_lflag &= ~(TOSTOP | ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL); |
a7c97a40 CB |
510 | #ifdef IEXTEN |
511 | newtios.c_lflag &= ~IEXTEN; | |
512 | #endif | |
300ec717 | 513 | newtios.c_oflag |= OPOST; |
b5159817 DE |
514 | newtios.c_cc[VMIN] = 1; |
515 | newtios.c_cc[VTIME] = 0; | |
e0dc0de7 | 516 | |
a7c97a40 | 517 | /* Set new attributes. */ |
e4953e62 CB |
518 | ret = tcsetattr(fd, TCSAFLUSH, &newtios); |
519 | if (ret < 0) { | |
520 | ERROR("Failed to set new terminal settings"); | |
b5159817 | 521 | return -1; |
e0dc0de7 DL |
522 | } |
523 | ||
63376d7d | 524 | return 0; |
b5159817 | 525 | } |
e0dc0de7 | 526 | |
dcad02f8 | 527 | static void lxc_terminal_peer_proxy_free(struct lxc_terminal *terminal) |
b5159817 | 528 | { |
2083d59d CB |
529 | if (terminal->tty_state) { |
530 | lxc_terminal_signal_fini(terminal->tty_state); | |
531 | terminal->tty_state = NULL; | |
b5159817 | 532 | } |
e788f4ac | 533 | |
fb87aa6a | 534 | close(terminal->proxy.master); |
fb87aa6a | 535 | terminal->proxy.master = -1; |
e788f4ac CB |
536 | |
537 | close(terminal->proxy.slave); | |
fb87aa6a | 538 | terminal->proxy.slave = -1; |
e788f4ac | 539 | |
fb87aa6a | 540 | terminal->proxy.busy = -1; |
e788f4ac | 541 | |
fb87aa6a | 542 | terminal->proxy.name[0] = '\0'; |
e788f4ac | 543 | |
2083d59d | 544 | terminal->peer = -1; |
b5159817 | 545 | } |
596a818d | 546 | |
60dd8ef4 CB |
547 | static int lxc_terminal_peer_proxy_alloc(struct lxc_terminal *terminal, |
548 | int sockfd) | |
b5159817 | 549 | { |
60dd8ef4 | 550 | int ret; |
b5159817 | 551 | struct termios oldtermio; |
5b55021f | 552 | struct lxc_terminal_state *ts; |
b5159817 | 553 | |
2083d59d CB |
554 | if (terminal->master < 0) { |
555 | ERROR("Terminal not set up"); | |
b5159817 DE |
556 | return -1; |
557 | } | |
60dd8ef4 | 558 | |
fb87aa6a | 559 | if (terminal->proxy.busy != -1 || terminal->peer != -1) { |
2083d59d | 560 | NOTICE("Terminal already in use"); |
b5159817 DE |
561 | return -1; |
562 | } | |
60dd8ef4 | 563 | |
2083d59d | 564 | if (terminal->tty_state) { |
60dd8ef4 | 565 | ERROR("Terminal has already been initialized"); |
b5159817 | 566 | return -1; |
596a818d DE |
567 | } |
568 | ||
d712f9e8 CB |
569 | /* This is the proxy terminal that will be given to the client, and |
570 | * that the real terminal master will send to / recv from. | |
b5159817 | 571 | */ |
fb87aa6a | 572 | ret = openpty(&terminal->proxy.master, &terminal->proxy.slave, |
60dd8ef4 CB |
573 | terminal->proxy.name, NULL, NULL); |
574 | if (ret < 0) { | |
575 | SYSERROR("Failed to open proxy terminal"); | |
b5159817 DE |
576 | return -1; |
577 | } | |
596a818d | 578 | |
60dd8ef4 CB |
579 | ret = lxc_setup_tios(terminal->proxy.slave, &oldtermio); |
580 | if (ret < 0) | |
581 | goto on_error; | |
b5159817 | 582 | |
fb87aa6a | 583 | ts = lxc_terminal_signal_init(terminal->proxy.master, terminal->master); |
b5159817 | 584 | if (!ts) |
60dd8ef4 | 585 | goto on_error; |
b5159817 | 586 | |
2083d59d | 587 | terminal->tty_state = ts; |
fb87aa6a CB |
588 | terminal->peer = terminal->proxy.slave; |
589 | terminal->proxy.busy = sockfd; | |
2083d59d | 590 | ret = lxc_terminal_mainloop_add_peer(terminal); |
a529bc25 | 591 | if (ret < 0) |
60dd8ef4 | 592 | goto on_error; |
b5159817 | 593 | |
60dd8ef4 CB |
594 | NOTICE("Opened proxy terminal with master fd %d and slave fd %d", |
595 | terminal->proxy.master, terminal->proxy.slave); | |
b5159817 DE |
596 | return 0; |
597 | ||
60dd8ef4 | 598 | on_error: |
2083d59d | 599 | lxc_terminal_peer_proxy_free(terminal); |
63376d7d DL |
600 | return -1; |
601 | } | |
602 | ||
c1ee47cd | 603 | int lxc_terminal_allocate(struct lxc_conf *conf, int sockfd, int *ttyreq) |
b5159817 | 604 | { |
12c2eaaa CB |
605 | int ttynum; |
606 | int masterfd = -1; | |
0e4be3cf | 607 | struct lxc_tty_info *ttys = &conf->ttys; |
dcad02f8 | 608 | struct lxc_terminal *terminal = &conf->console; |
b5159817 | 609 | |
b5159817 | 610 | if (*ttyreq == 0) { |
12c2eaaa CB |
611 | int ret; |
612 | ||
613 | ret = lxc_terminal_peer_proxy_alloc(terminal, sockfd); | |
614 | if (ret < 0) | |
b5159817 | 615 | goto out; |
12c2eaaa | 616 | |
fb87aa6a | 617 | masterfd = terminal->proxy.master; |
b5159817 DE |
618 | goto out; |
619 | } | |
620 | ||
621 | if (*ttyreq > 0) { | |
885766f5 | 622 | if (*ttyreq > ttys->max) |
b5159817 DE |
623 | goto out; |
624 | ||
0e4be3cf | 625 | if (ttys->tty[*ttyreq - 1].busy) |
b5159817 DE |
626 | goto out; |
627 | ||
12c2eaaa | 628 | /* The requested tty is available. */ |
b5159817 DE |
629 | ttynum = *ttyreq; |
630 | goto out_tty; | |
631 | } | |
632 | ||
12c2eaaa | 633 | /* Search for next available tty, fixup index tty1 => [0]. */ |
885766f5 | 634 | for (ttynum = 1; ttynum <= ttys->max && ttys->tty[ttynum - 1].busy; ttynum++) { |
0d4137cc | 635 | ; |
12c2eaaa | 636 | } |
b5159817 | 637 | |
12c2eaaa | 638 | /* We didn't find any available slot for tty. */ |
885766f5 | 639 | if (ttynum > ttys->max) |
b5159817 DE |
640 | goto out; |
641 | ||
642 | *ttyreq = ttynum; | |
643 | ||
644 | out_tty: | |
0e4be3cf CB |
645 | ttys->tty[ttynum - 1].busy = sockfd; |
646 | masterfd = ttys->tty[ttynum - 1].master; | |
12c2eaaa | 647 | |
b5159817 | 648 | out: |
b5159817 DE |
649 | return masterfd; |
650 | } | |
651 | ||
3dfe6f8d | 652 | void lxc_terminal_free(struct lxc_conf *conf, int fd) |
63376d7d | 653 | { |
b5159817 | 654 | int i; |
0e4be3cf | 655 | struct lxc_tty_info *ttys = &conf->ttys; |
dcad02f8 | 656 | struct lxc_terminal *terminal = &conf->console; |
b5159817 | 657 | |
885766f5 | 658 | for (i = 0; i < ttys->max; i++) |
0e4be3cf CB |
659 | if (ttys->tty[i].busy == fd) |
660 | ttys->tty[i].busy = 0; | |
b5159817 | 661 | |
1b5e93c4 CB |
662 | if (terminal->proxy.busy != fd) |
663 | return; | |
664 | ||
665 | lxc_mainloop_del_handler(terminal->descr, terminal->proxy.slave); | |
666 | lxc_terminal_peer_proxy_free(terminal); | |
b5159817 DE |
667 | } |
668 | ||
dcad02f8 | 669 | static int lxc_terminal_peer_default(struct lxc_terminal *terminal) |
b5159817 | 670 | { |
5b55021f | 671 | struct lxc_terminal_state *ts; |
46768cce | 672 | const char *path; |
467c7ff3 | 673 | int ret = 0; |
b5159817 | 674 | |
46768cce CB |
675 | if (terminal->path) |
676 | path = terminal->path; | |
677 | else | |
678 | path = "/dev/tty"; | |
b5159817 | 679 | |
2083d59d CB |
680 | terminal->peer = lxc_unpriv(open(path, O_RDWR | O_CLOEXEC)); |
681 | if (terminal->peer < 0) { | |
46768cce CB |
682 | if (!terminal->path) { |
683 | errno = ENODEV; | |
684 | DEBUG("%s - The process does not have a controlling " | |
685 | "terminal", strerror(errno)); | |
686 | goto on_succes; | |
687 | } | |
688 | ||
49cd0656 CB |
689 | ERROR("%s - Failed to open proxy terminal \"%s\"", |
690 | strerror(errno), path); | |
467c7ff3 CB |
691 | return -ENOTTY; |
692 | } | |
49cd0656 | 693 | DEBUG("Using terminal \"%s\" as proxy", path); |
b5159817 | 694 | |
2083d59d | 695 | if (!isatty(terminal->peer)) { |
49cd0656 CB |
696 | ERROR("File descriptor for \"%s\" does not refer to a terminal", path); |
697 | goto on_error_free_tios; | |
467c7ff3 | 698 | } |
b5159817 | 699 | |
2083d59d CB |
700 | ts = lxc_terminal_signal_init(terminal->peer, terminal->master); |
701 | terminal->tty_state = ts; | |
341c2aed | 702 | if (!ts) { |
0519b5cc | 703 | WARN("Failed to install signal handler"); |
49cd0656 | 704 | goto on_error_free_tios; |
341c2aed | 705 | } |
b5159817 | 706 | |
2083d59d | 707 | lxc_terminal_winsz(terminal->peer, terminal->master); |
b5159817 | 708 | |
2083d59d | 709 | terminal->tios = malloc(sizeof(*terminal->tios)); |
49cd0656 CB |
710 | if (!terminal->tios) |
711 | goto on_error_free_tios; | |
b5159817 | 712 | |
49cd0656 CB |
713 | ret = lxc_setup_tios(terminal->peer, terminal->tios); |
714 | if (ret < 0) | |
715 | goto on_error_close_peer; | |
467c7ff3 | 716 | else |
49cd0656 | 717 | goto on_succes; |
b5159817 | 718 | |
49cd0656 | 719 | on_error_free_tios: |
2083d59d CB |
720 | free(terminal->tios); |
721 | terminal->tios = NULL; | |
467c7ff3 | 722 | |
49cd0656 | 723 | on_error_close_peer: |
2083d59d CB |
724 | close(terminal->peer); |
725 | terminal->peer = -1; | |
467c7ff3 CB |
726 | ret = -ENOTTY; |
727 | ||
49cd0656 | 728 | on_succes: |
467c7ff3 | 729 | return ret; |
b5159817 DE |
730 | } |
731 | ||
dcad02f8 | 732 | int lxc_terminal_write_ringbuffer(struct lxc_terminal *terminal) |
39c6cdb7 CB |
733 | { |
734 | char *r_addr; | |
735 | ssize_t ret; | |
736 | uint64_t used; | |
2083d59d | 737 | struct lxc_ringbuf *buf = &terminal->ringbuf; |
39c6cdb7 CB |
738 | |
739 | /* There's not log file where we can dump the ringbuffer to. */ | |
2083d59d | 740 | if (terminal->log_fd < 0) |
39c6cdb7 CB |
741 | return 0; |
742 | ||
39c6cdb7 CB |
743 | used = lxc_ringbuf_used(buf); |
744 | if (used == 0) | |
745 | return 0; | |
746 | ||
2083d59d | 747 | ret = lxc_terminal_truncate_log_file(terminal); |
39c6cdb7 CB |
748 | if (ret < 0) |
749 | return ret; | |
750 | ||
751 | /* Write as much as we can without exceeding the limit. */ | |
2083d59d CB |
752 | if (terminal->log_size < used) |
753 | used = terminal->log_size; | |
39c6cdb7 CB |
754 | |
755 | r_addr = lxc_ringbuf_get_read_addr(buf); | |
2083d59d | 756 | ret = lxc_write_nointr(terminal->log_fd, r_addr, used); |
39c6cdb7 CB |
757 | if (ret < 0) |
758 | return -EIO; | |
759 | ||
760 | return 0; | |
761 | } | |
762 | ||
dcad02f8 | 763 | void lxc_terminal_delete(struct lxc_terminal *terminal) |
b5159817 | 764 | { |
69629c82 CB |
765 | int ret; |
766 | ||
2083d59d | 767 | ret = lxc_terminal_write_ringbuffer(terminal); |
39c6cdb7 | 768 | if (ret < 0) |
2083d59d | 769 | WARN("Failed to write terminal log to disk"); |
39c6cdb7 | 770 | |
2083d59d CB |
771 | if (terminal->tios && terminal->peer >= 0) { |
772 | ret = tcsetattr(terminal->peer, TCSAFLUSH, terminal->tios); | |
69629c82 CB |
773 | if (ret < 0) |
774 | WARN("%s - Failed to set old terminal settings", strerror(errno)); | |
775 | } | |
2083d59d CB |
776 | free(terminal->tios); |
777 | terminal->tios = NULL; | |
596a818d | 778 | |
2083d59d CB |
779 | if (terminal->peer >= 0) |
780 | close(terminal->peer); | |
781 | terminal->peer = -1; | |
bc9724f7 | 782 | |
2083d59d CB |
783 | if (terminal->master >= 0) |
784 | close(terminal->master); | |
785 | terminal->master = -1; | |
bc9724f7 | 786 | |
2083d59d CB |
787 | if (terminal->slave >= 0) |
788 | close(terminal->slave); | |
789 | terminal->slave = -1; | |
bc9724f7 | 790 | |
2083d59d CB |
791 | if (terminal->log_fd >= 0) |
792 | close(terminal->log_fd); | |
793 | terminal->log_fd = -1; | |
63376d7d DL |
794 | } |
795 | ||
3b988b33 CB |
796 | /** |
797 | * Note that this function needs to run before the mainloop starts. Since we | |
2083d59d CB |
798 | * register a handler for the terminal's masterfd when we create the mainloop |
799 | * the terminal handler needs to see an allocated ringbuffer. | |
3b988b33 | 800 | */ |
dcad02f8 | 801 | static int lxc_terminal_create_ringbuf(struct lxc_terminal *terminal) |
3b988b33 CB |
802 | { |
803 | int ret; | |
2083d59d CB |
804 | struct lxc_ringbuf *buf = &terminal->ringbuf; |
805 | uint64_t size = terminal->buffer_size; | |
3b988b33 CB |
806 | |
807 | /* no ringbuffer previously allocated and no ringbuffer requested */ | |
808 | if (!buf->addr && size <= 0) | |
809 | return 0; | |
810 | ||
811 | /* ringbuffer allocated but no new ringbuffer requested */ | |
812 | if (buf->addr && size <= 0) { | |
813 | lxc_ringbuf_release(buf); | |
814 | buf->addr = NULL; | |
815 | buf->r_off = 0; | |
816 | buf->w_off = 0; | |
817 | buf->size = 0; | |
2083d59d | 818 | TRACE("Deallocated terminal ringbuffer"); |
3b988b33 CB |
819 | return 0; |
820 | } | |
821 | ||
822 | if (size <= 0) | |
823 | return 0; | |
824 | ||
825 | /* check wether the requested size for the ringbuffer has changed */ | |
826 | if (buf->addr && buf->size != size) { | |
2083d59d CB |
827 | TRACE("Terminal ringbuffer size changed from %" PRIu64 |
828 | " to %" PRIu64 " bytes. Deallocating terminal ringbuffer", | |
3b988b33 CB |
829 | buf->size, size); |
830 | lxc_ringbuf_release(buf); | |
831 | } | |
832 | ||
833 | ret = lxc_ringbuf_create(buf, size); | |
834 | if (ret < 0) { | |
2083d59d | 835 | ERROR("Failed to setup %" PRIu64 " byte terminal ringbuffer", size); |
3b988b33 CB |
836 | return -1; |
837 | } | |
838 | ||
2083d59d | 839 | TRACE("Allocated %" PRIu64 " byte terminal ringbuffer", size); |
3b988b33 CB |
840 | return 0; |
841 | } | |
842 | ||
a0309168 | 843 | /** |
2083d59d CB |
844 | * This is the terminal log file. Please note that the terminal log file is |
845 | * (implementation wise not content wise) independent of the terminal ringbuffer. | |
a0309168 | 846 | */ |
dcad02f8 | 847 | int lxc_terminal_create_log_file(struct lxc_terminal *terminal) |
a0309168 | 848 | { |
2083d59d | 849 | if (!terminal->log_path) |
a0309168 CB |
850 | return 0; |
851 | ||
2083d59d CB |
852 | terminal->log_fd = lxc_unpriv(open(terminal->log_path, O_CLOEXEC | O_RDWR | O_CREAT | O_APPEND, 0600)); |
853 | if (terminal->log_fd < 0) { | |
854 | SYSERROR("Failed to open terminal log file \"%s\"", terminal->log_path); | |
a0309168 CB |
855 | return -1; |
856 | } | |
857 | ||
2083d59d | 858 | DEBUG("Using \"%s\" as terminal log file", terminal->log_path); |
a0309168 CB |
859 | return 0; |
860 | } | |
861 | ||
dcad02f8 | 862 | int lxc_terminal_create(struct lxc_terminal *terminal) |
63376d7d | 863 | { |
8ded9244 | 864 | int ret; |
b5159817 | 865 | |
8ded9244 | 866 | ret = openpty(&terminal->master, &terminal->slave, terminal->name, NULL, NULL); |
467c7ff3 | 867 | if (ret < 0) { |
8ded9244 | 868 | SYSERROR("Failed to open terminal"); |
b5159817 DE |
869 | return -1; |
870 | } | |
871 | ||
2083d59d | 872 | ret = fcntl(terminal->master, F_SETFD, FD_CLOEXEC); |
69629c82 | 873 | if (ret < 0) { |
2083d59d | 874 | SYSERROR("Failed to set FD_CLOEXEC flag on terminal master"); |
b5159817 DE |
875 | goto err; |
876 | } | |
877 | ||
2083d59d | 878 | ret = fcntl(terminal->slave, F_SETFD, FD_CLOEXEC); |
69629c82 | 879 | if (ret < 0) { |
2083d59d | 880 | SYSERROR("Failed to set FD_CLOEXEC flag on terminal slave"); |
b5159817 DE |
881 | goto err; |
882 | } | |
883 | ||
2083d59d | 884 | ret = lxc_terminal_peer_default(terminal); |
467c7ff3 | 885 | if (ret < 0) { |
8ded9244 | 886 | ERROR("Failed to allocate proxy terminal"); |
467c7ff3 CB |
887 | goto err; |
888 | } | |
b5159817 | 889 | |
5777fe90 CB |
890 | return 0; |
891 | ||
892 | err: | |
2083d59d | 893 | lxc_terminal_delete(terminal); |
5777fe90 CB |
894 | return -ENODEV; |
895 | } | |
896 | ||
564e31c4 | 897 | int lxc_terminal_setup(struct lxc_conf *conf) |
5777fe90 CB |
898 | { |
899 | int ret; | |
dcad02f8 | 900 | struct lxc_terminal *terminal = &conf->console; |
5777fe90 | 901 | |
1a443ac1 CB |
902 | if (terminal->path && strcmp(terminal->path, "none") == 0) { |
903 | INFO("No terminal requested"); | |
5777fe90 CB |
904 | return 0; |
905 | } | |
906 | ||
96eee564 | 907 | ret = lxc_terminal_create(terminal); |
5777fe90 CB |
908 | if (ret < 0) |
909 | return -1; | |
910 | ||
2083d59d | 911 | ret = lxc_terminal_create_log_file(terminal); |
a0309168 CB |
912 | if (ret < 0) |
913 | goto err; | |
914 | ||
2083d59d | 915 | ret = lxc_terminal_create_ringbuf(terminal); |
a0309168 CB |
916 | if (ret < 0) |
917 | goto err; | |
b5159817 DE |
918 | |
919 | return 0; | |
920 | ||
921 | err: | |
2083d59d | 922 | lxc_terminal_delete(terminal); |
69629c82 | 923 | return -ENODEV; |
b5159817 DE |
924 | } |
925 | ||
8ca7b374 CB |
926 | static bool __terminal_dup2(int duplicate, int original) |
927 | { | |
928 | int ret; | |
929 | ||
930 | if (!isatty(original)) | |
931 | return true; | |
932 | ||
933 | ret = dup2(duplicate, original); | |
934 | if (ret < 0) { | |
935 | SYSERROR("Failed to dup2(%d, %d)", duplicate, original); | |
936 | return false; | |
937 | } | |
938 | ||
939 | return true; | |
940 | } | |
941 | ||
ae6d3913 | 942 | int lxc_terminal_set_stdfds(int fd) |
0d9acb99 | 943 | { |
8ca7b374 CB |
944 | int i; |
945 | ||
39a78bbe | 946 | if (fd < 0) |
0d9acb99 | 947 | return 0; |
b5159817 | 948 | |
8ca7b374 CB |
949 | for (i = 0; i < 3; i++) |
950 | if (!__terminal_dup2(fd, (int[]){STDIN_FILENO, STDOUT_FILENO, | |
951 | STDERR_FILENO}[i])) | |
39a78bbe | 952 | return -1; |
39a78bbe | 953 | |
0d9acb99 DE |
954 | return 0; |
955 | } | |
b5159817 | 956 | |
52f9292f | 957 | int lxc_terminal_stdin_cb(int fd, uint32_t events, void *cbdata, |
15085292 | 958 | struct lxc_epoll_descr *descr) |
b5159817 | 959 | { |
15085292 | 960 | int ret; |
b5159817 | 961 | char c; |
15085292 | 962 | struct lxc_terminal_state *ts = cbdata; |
b5159817 | 963 | |
97bc2422 | 964 | if (fd != ts->stdinfd) |
a529bc25 | 965 | return LXC_MAINLOOP_CLOSE; |
97bc2422 | 966 | |
15085292 CB |
967 | ret = lxc_read_nointr(ts->stdinfd, &c, 1); |
968 | if (ret <= 0) | |
a529bc25 | 969 | return LXC_MAINLOOP_CLOSE; |
63376d7d | 970 | |
525e2117 | 971 | if (ts->escape >= 1) { |
2083d59d | 972 | /* we want to exit the terminal with Ctrl+a q */ |
014d5e1e CB |
973 | if (c == ts->escape && !ts->saw_escape) { |
974 | ts->saw_escape = 1; | |
15085292 | 975 | return LXC_MAINLOOP_CONTINUE; |
014d5e1e | 976 | } |
5c294060 | 977 | |
014d5e1e | 978 | if (c == 'q' && ts->saw_escape) |
a529bc25 | 979 | return LXC_MAINLOOP_CLOSE; |
014d5e1e CB |
980 | |
981 | ts->saw_escape = 0; | |
982 | } | |
63376d7d | 983 | |
15085292 CB |
984 | ret = lxc_write_nointr(ts->masterfd, &c, 1); |
985 | if (ret <= 0) | |
a529bc25 | 986 | return LXC_MAINLOOP_CLOSE; |
b5159817 | 987 | |
15085292 | 988 | return LXC_MAINLOOP_CONTINUE; |
63376d7d DL |
989 | } |
990 | ||
ee9102ff CB |
991 | int lxc_terminal_master_cb(int fd, uint32_t events, void *cbdata, |
992 | struct lxc_epoll_descr *descr) | |
63376d7d | 993 | { |
0d4137cc | 994 | int r, w; |
5bd171bd CB |
995 | char buf[LXC_TERMINAL_BUFFER_SIZE]; |
996 | struct lxc_terminal_state *ts = cbdata; | |
63376d7d | 997 | |
97bc2422 | 998 | if (fd != ts->masterfd) |
a529bc25 | 999 | return LXC_MAINLOOP_CLOSE; |
97bc2422 | 1000 | |
e66b6c96 CB |
1001 | r = lxc_read_nointr(fd, buf, sizeof(buf)); |
1002 | if (r <= 0) | |
a529bc25 | 1003 | return LXC_MAINLOOP_CLOSE; |
1560f6c9 | 1004 | |
e66b6c96 | 1005 | w = lxc_write_nointr(ts->stdoutfd, buf, r); |
5bd171bd | 1006 | if (w <= 0 || w != r) |
a529bc25 | 1007 | return LXC_MAINLOOP_CLOSE; |
f78a1f32 | 1008 | |
5bd171bd | 1009 | return LXC_MAINLOOP_CONTINUE; |
b5159817 DE |
1010 | } |
1011 | ||
c86e2584 | 1012 | int lxc_terminal_getfd(struct lxc_container *c, int *ttynum, int *masterfd) |
b5159817 DE |
1013 | { |
1014 | return lxc_cmd_console(c->name, ttynum, masterfd, c->config_path); | |
1015 | } | |
1016 | ||
1017 | int lxc_console(struct lxc_container *c, int ttynum, | |
1018 | int stdinfd, int stdoutfd, int stderrfd, | |
1019 | int escape) | |
1020 | { | |
71ac3f07 | 1021 | int masterfd, ret, ttyfd; |
b5159817 DE |
1022 | struct lxc_epoll_descr descr; |
1023 | struct termios oldtios; | |
5b55021f | 1024 | struct lxc_terminal_state *ts; |
25964232 | 1025 | int istty = 0; |
b5159817 | 1026 | |
b5159817 | 1027 | ttyfd = lxc_cmd_console(c->name, &ttynum, &masterfd, c->config_path); |
6834f805 CB |
1028 | if (ttyfd < 0) |
1029 | return -1; | |
b5159817 DE |
1030 | |
1031 | ret = setsid(); | |
33b4b411 CB |
1032 | if (ret < 0) |
1033 | TRACE("Process is already group leader"); | |
b5159817 | 1034 | |
dc8c7883 | 1035 | ts = lxc_terminal_signal_init(stdinfd, masterfd); |
b5159817 DE |
1036 | if (!ts) { |
1037 | ret = -1; | |
33b4b411 | 1038 | goto close_fds; |
b5159817 DE |
1039 | } |
1040 | ts->escape = escape; | |
1041 | ts->winch_proxy = c->name; | |
1042 | ts->winch_proxy_lxcpath = c->config_path; | |
3b975060 | 1043 | ts->stdoutfd = stdoutfd; |
b5159817 | 1044 | |
6834f805 | 1045 | istty = isatty(stdinfd); |
25964232 | 1046 | if (istty) { |
4e9c0330 | 1047 | lxc_terminal_winsz(stdinfd, masterfd); |
8ccbbf94 | 1048 | lxc_cmd_terminal_winch(ts->winch_proxy, ts->winch_proxy_lxcpath); |
6834f805 | 1049 | } else { |
71ac3f07 | 1050 | INFO("File descriptor %d does not refer to a terminal", stdinfd); |
25964232 | 1051 | } |
b5159817 DE |
1052 | |
1053 | ret = lxc_mainloop_open(&descr); | |
1054 | if (ret) { | |
33b4b411 CB |
1055 | ERROR("Failed to create mainloop"); |
1056 | goto sigwinch_fini; | |
b5159817 DE |
1057 | } |
1058 | ||
341c2aed CB |
1059 | if (ts->sigfd != -1) { |
1060 | ret = lxc_mainloop_add_handler(&descr, ts->sigfd, | |
9bafc8cb | 1061 | lxc_terminal_signalfd_cb, ts); |
33b4b411 | 1062 | if (ret < 0) { |
0519b5cc | 1063 | ERROR("Failed to add signal handler to mainloop"); |
33b4b411 | 1064 | goto close_mainloop; |
341c2aed | 1065 | } |
b5159817 DE |
1066 | } |
1067 | ||
1068 | ret = lxc_mainloop_add_handler(&descr, ts->stdinfd, | |
52f9292f | 1069 | lxc_terminal_stdin_cb, ts); |
33b4b411 CB |
1070 | if (ret < 0) { |
1071 | ERROR("Failed to add stdin handler"); | |
1072 | goto close_mainloop; | |
b5159817 DE |
1073 | } |
1074 | ||
1075 | ret = lxc_mainloop_add_handler(&descr, ts->masterfd, | |
ee9102ff | 1076 | lxc_terminal_master_cb, ts); |
33b4b411 CB |
1077 | if (ret < 0) { |
1078 | ERROR("Failed to add master handler"); | |
1079 | goto close_mainloop; | |
b5159817 DE |
1080 | } |
1081 | ||
686df166 CB |
1082 | if (ts->escape >= 1) { |
1083 | fprintf(stderr, | |
1084 | "\n" | |
6834f805 CB |
1085 | "Connected to tty %1$d\n" |
1086 | "Type <Ctrl+%2$c q> to exit the console, " | |
1087 | "<Ctrl+%2$c Ctrl+%2$c> to enter Ctrl+%2$c itself\n", | |
1088 | ttynum, 'a' + escape - 1); | |
686df166 | 1089 | } |
6834f805 CB |
1090 | |
1091 | if (istty) { | |
1092 | ret = lxc_setup_tios(stdinfd, &oldtios); | |
1093 | if (ret < 0) | |
1094 | goto close_mainloop; | |
1095 | } | |
1096 | ||
025ed0f3 | 1097 | ret = lxc_mainloop(&descr, -1); |
33b4b411 CB |
1098 | if (ret < 0) { |
1099 | ERROR("The mainloop returned an error"); | |
6834f805 | 1100 | goto restore_tios; |
b5159817 DE |
1101 | } |
1102 | ||
1103 | ret = 0; | |
1104 | ||
6834f805 CB |
1105 | restore_tios: |
1106 | if (istty) { | |
1107 | istty = tcsetattr(stdinfd, TCSAFLUSH, &oldtios); | |
1108 | if (istty < 0) | |
1109 | WARN("%s - Failed to restore terminal properties", | |
1110 | strerror(errno)); | |
1111 | } | |
1112 | ||
33b4b411 | 1113 | close_mainloop: |
b5159817 | 1114 | lxc_mainloop_close(&descr); |
33b4b411 CB |
1115 | |
1116 | sigwinch_fini: | |
a8867251 | 1117 | lxc_terminal_signal_fini(ts); |
33b4b411 CB |
1118 | |
1119 | close_fds: | |
b5159817 DE |
1120 | close(masterfd); |
1121 | close(ttyfd); | |
33b4b411 | 1122 | |
b5159817 | 1123 | return ret; |
63376d7d | 1124 | } |
e98affda | 1125 | |
cd0a2b2f | 1126 | int lxc_make_controlling_terminal(int fd) |
e98affda CB |
1127 | { |
1128 | int ret; | |
1129 | ||
1130 | setsid(); | |
1131 | ||
1132 | ret = ioctl(fd, TIOCSCTTY, (char *)NULL); | |
1133 | if (ret < 0) | |
1134 | return -1; | |
1135 | ||
1136 | return 0; | |
1137 | } | |
1138 | ||
d049f0e9 | 1139 | int lxc_terminal_prepare_login(int fd) |
e98affda CB |
1140 | { |
1141 | int ret; | |
1142 | ||
cd0a2b2f | 1143 | ret = lxc_make_controlling_terminal(fd); |
e98affda CB |
1144 | if (ret < 0) |
1145 | return -1; | |
1146 | ||
ae6d3913 | 1147 | ret = lxc_terminal_set_stdfds(fd); |
e98affda CB |
1148 | if (ret < 0) |
1149 | return -1; | |
1150 | ||
1151 | if (fd > STDERR_FILENO) | |
1152 | close(fd); | |
1153 | ||
1154 | return 0; | |
1155 | } | |
1156 | ||
e9a55b51 | 1157 | void lxc_terminal_info_init(struct lxc_terminal_info *terminal) |
e98affda | 1158 | { |
e9a55b51 CB |
1159 | terminal->name[0] = '\0'; |
1160 | terminal->master = -EBADF; | |
1161 | terminal->slave = -EBADF; | |
1162 | terminal->busy = -1; | |
e98affda CB |
1163 | } |
1164 | ||
e9a55b51 | 1165 | void lxc_terminal_init(struct lxc_terminal *terminal) |
e98affda | 1166 | { |
e9a55b51 CB |
1167 | memset(terminal, 0, sizeof(*terminal)); |
1168 | terminal->slave = -EBADF; | |
1169 | terminal->master = -EBADF; | |
1170 | terminal->peer = -EBADF; | |
1171 | terminal->log_fd = -EBADF; | |
1172 | lxc_terminal_info_init(&terminal->proxy); | |
e98affda CB |
1173 | } |
1174 | ||
dcad02f8 | 1175 | void lxc_terminal_conf_free(struct lxc_terminal *terminal) |
e98affda | 1176 | { |
2083d59d CB |
1177 | free(terminal->log_path); |
1178 | free(terminal->path); | |
1179 | if (terminal->buffer_size > 0 && terminal->ringbuf.addr) | |
1180 | lxc_ringbuf_release(&terminal->ringbuf); | |
e98affda | 1181 | } |
7cfeddd7 | 1182 | |
03700cab | 1183 | int lxc_terminal_map_ids(struct lxc_conf *c, struct lxc_terminal *terminal) |
7cfeddd7 CB |
1184 | { |
1185 | int ret; | |
1186 | ||
1187 | if (lxc_list_empty(&c->id_map)) | |
1188 | return 0; | |
1189 | ||
03700cab | 1190 | if (strcmp(terminal->name, "") == 0) |
7cfeddd7 CB |
1191 | return 0; |
1192 | ||
03700cab | 1193 | ret = chown_mapped_root(terminal->name, c); |
7cfeddd7 | 1194 | if (ret < 0) { |
03700cab | 1195 | ERROR("Failed to chown terminal \"%s\"", terminal->name); |
7cfeddd7 CB |
1196 | return -1; |
1197 | } | |
1198 | ||
03700cab | 1199 | TRACE("Chowned terminal \"%s\"", terminal->name); |
7cfeddd7 CB |
1200 | |
1201 | return 0; | |
1202 | } |