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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 | ||
b5159817 | 24 | #include <assert.h> |
9395937a CB |
25 | #include <errno.h> |
26 | #include <fcntl.h> | |
b5159817 | 27 | #include <signal.h> |
b0a33c1e | 28 | #include <stdio.h> |
e0dc0de7 | 29 | #include <stdlib.h> |
8173e600 | 30 | #include <termios.h> |
9395937a | 31 | #include <unistd.h> |
da41561c CB |
32 | #include <sys/epoll.h> |
33 | #include <sys/types.h> | |
b0a33c1e | 34 | |
948955a2 | 35 | #include <lxc/lxccontainer.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" |
0d4137cc | 42 | #include "console.h" |
9395937a | 43 | #include "log.h" |
b5159817 | 44 | #include "lxclock.h" |
9395937a CB |
45 | #include "mainloop.h" |
46 | #include "start.h" /* for struct lxc_handler */ | |
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 | ||
36eb9bde CLG |
55 | lxc_log_define(lxc_console, lxc); |
56 | ||
b5159817 | 57 | static struct lxc_list lxc_ttys; |
724e753c | 58 | |
b5159817 | 59 | typedef void (*sighandler_t)(int); |
b5159817 DE |
60 | |
61 | __attribute__((constructor)) | |
62 | void lxc_console_init(void) | |
63 | { | |
64 | lxc_list_init(&lxc_ttys); | |
65 | } | |
724e753c | 66 | |
0d4137cc | 67 | void lxc_console_winsz(int srcfd, int dstfd) |
b5159817 DE |
68 | { |
69 | struct winsize wsz; | |
70 | if (isatty(srcfd) && ioctl(srcfd, TIOCGWINSZ, &wsz) == 0) { | |
71 | DEBUG("set winsz dstfd:%d cols:%d rows:%d", dstfd, | |
72 | wsz.ws_col, wsz.ws_row); | |
73 | ioctl(dstfd, TIOCSWINSZ, &wsz); | |
724e753c | 74 | } |
b5159817 | 75 | } |
724e753c | 76 | |
b5159817 DE |
77 | static void lxc_console_winch(struct lxc_tty_state *ts) |
78 | { | |
79 | lxc_console_winsz(ts->stdinfd, ts->masterfd); | |
0d4137cc CB |
80 | if (ts->winch_proxy) |
81 | lxc_cmd_console_winch(ts->winch_proxy, ts->winch_proxy_lxcpath); | |
724e753c MN |
82 | } |
83 | ||
b5159817 | 84 | void lxc_console_sigwinch(int sig) |
cd453b38 | 85 | { |
025ed0f3 SH |
86 | struct lxc_list *it; |
87 | struct lxc_tty_state *ts; | |
cd453b38 | 88 | |
025ed0f3 SH |
89 | lxc_list_for_each(it, &lxc_ttys) { |
90 | ts = it->elem; | |
91 | lxc_console_winch(ts); | |
cd453b38 | 92 | } |
b5159817 | 93 | } |
cd453b38 | 94 | |
0d4137cc CB |
95 | int lxc_console_cb_sigwinch_fd(int fd, uint32_t events, void *cbdata, |
96 | struct lxc_epoll_descr *descr) | |
b5159817 DE |
97 | { |
98 | struct signalfd_siginfo siginfo; | |
99 | struct lxc_tty_state *ts = cbdata; | |
100 | ||
0d4137cc CB |
101 | ssize_t ret = read(fd, &siginfo, sizeof(siginfo)); |
102 | if (ret < 0 || (size_t)ret < sizeof(siginfo)) { | |
b5159817 DE |
103 | ERROR("failed to read signal info"); |
104 | return -1; | |
cd453b38 DL |
105 | } |
106 | ||
b5159817 DE |
107 | lxc_console_winch(ts); |
108 | return 0; | |
109 | } | |
110 | ||
0d4137cc | 111 | struct lxc_tty_state *lxc_console_sigwinch_init(int srcfd, int dstfd) |
b5159817 DE |
112 | { |
113 | sigset_t mask; | |
114 | struct lxc_tty_state *ts; | |
115 | ||
116 | ts = malloc(sizeof(*ts)); | |
117 | if (!ts) | |
118 | return NULL; | |
119 | ||
120 | memset(ts, 0, sizeof(*ts)); | |
341c2aed | 121 | ts->stdinfd = srcfd; |
b5159817 | 122 | ts->masterfd = dstfd; |
341c2aed | 123 | ts->sigfd = -1; |
b5159817 DE |
124 | |
125 | /* add tty to list to be scanned at SIGWINCH time */ | |
126 | lxc_list_add_elem(&ts->node, ts); | |
127 | lxc_list_add_tail(&lxc_ttys, &ts->node); | |
128 | ||
129 | sigemptyset(&mask); | |
130 | sigaddset(&mask, SIGWINCH); | |
131 | if (sigprocmask(SIG_BLOCK, &mask, &ts->oldmask)) { | |
341c2aed CB |
132 | SYSERROR("failed to block SIGWINCH."); |
133 | ts->sigfd = -1; | |
134 | return ts; | |
b5159817 DE |
135 | } |
136 | ||
137 | ts->sigfd = signalfd(-1, &mask, 0); | |
138 | if (ts->sigfd < 0) { | |
341c2aed CB |
139 | SYSERROR("failed to get signalfd."); |
140 | sigprocmask(SIG_SETMASK, &ts->oldmask, NULL); | |
141 | ts->sigfd = -1; | |
142 | return ts; | |
b5159817 DE |
143 | } |
144 | ||
145 | DEBUG("%d got SIGWINCH fd %d", getpid(), ts->sigfd); | |
b5159817 | 146 | return ts; |
cd453b38 DL |
147 | } |
148 | ||
0d4137cc | 149 | void lxc_console_sigwinch_fini(struct lxc_tty_state *ts) |
63376d7d | 150 | { |
0d4137cc | 151 | if (ts->sigfd >= 0) |
b5159817 | 152 | close(ts->sigfd); |
0d4137cc | 153 | |
b5159817 DE |
154 | lxc_list_del(&ts->node); |
155 | sigprocmask(SIG_SETMASK, &ts->oldmask, NULL); | |
156 | free(ts); | |
157 | } | |
1560f6c9 | 158 | |
84c92abd | 159 | static int lxc_console_cb_con(int fd, uint32_t events, void *data, |
b5159817 DE |
160 | struct lxc_epoll_descr *descr) |
161 | { | |
162 | struct lxc_console *console = (struct lxc_console *)data; | |
163 | char buf[1024]; | |
3e6580ec | 164 | int r, w; |
e0dc0de7 | 165 | |
3e6580ec CB |
166 | w = r = lxc_read_nointr(fd, buf, sizeof(buf)); |
167 | if (r <= 0) { | |
b5159817 DE |
168 | INFO("console client on fd %d has exited", fd); |
169 | lxc_mainloop_del_handler(descr, fd); | |
170 | close(fd); | |
3e6580ec | 171 | return 1; |
33fcb7a0 | 172 | } |
63376d7d | 173 | |
b5159817 | 174 | if (fd == console->peer) |
3e6580ec | 175 | w = lxc_write_nointr(console->master, buf, r); |
b5159817 DE |
176 | |
177 | if (fd == console->master) { | |
178 | if (console->log_fd >= 0) | |
3e6580ec | 179 | w = lxc_write_nointr(console->log_fd, buf, r); |
b5159817 DE |
180 | |
181 | if (console->peer >= 0) | |
3e6580ec | 182 | w = lxc_write_nointr(console->peer, buf, r); |
63376d7d DL |
183 | } |
184 | ||
b5159817 DE |
185 | if (w != r) |
186 | WARN("console short write r:%d w:%d", r, w); | |
0d4137cc | 187 | |
b5159817 DE |
188 | return 0; |
189 | } | |
190 | ||
191 | static void lxc_console_mainloop_add_peer(struct lxc_console *console) | |
192 | { | |
193 | if (console->peer >= 0) { | |
194 | if (lxc_mainloop_add_handler(console->descr, console->peer, | |
195 | lxc_console_cb_con, console)) | |
196 | WARN("console peer not added to mainloop"); | |
63376d7d DL |
197 | } |
198 | ||
341c2aed | 199 | if (console->tty_state && console->tty_state->sigfd != -1) { |
b5159817 DE |
200 | if (lxc_mainloop_add_handler(console->descr, |
201 | console->tty_state->sigfd, | |
202 | lxc_console_cb_sigwinch_fd, | |
203 | console->tty_state)) { | |
204 | WARN("failed to add to mainloop SIGWINCH handler for '%d'", | |
205 | console->tty_state->sigfd); | |
596a818d | 206 | } |
b5159817 DE |
207 | } |
208 | } | |
209 | ||
da41561c CB |
210 | extern int lxc_console_mainloop_add(struct lxc_epoll_descr *descr, |
211 | struct lxc_conf *conf) | |
b5159817 | 212 | { |
b5159817 DE |
213 | struct lxc_console *console = &conf->console; |
214 | ||
37903589 SH |
215 | if (conf->is_execute) { |
216 | INFO("no console for lxc-execute."); | |
217 | return 0; | |
218 | } | |
219 | ||
b5159817 DE |
220 | if (!conf->rootfs.path) { |
221 | INFO("no rootfs, no console."); | |
222 | return 0; | |
223 | } | |
224 | ||
225 | if (console->master < 0) { | |
226 | INFO("no console"); | |
227 | return 0; | |
596a818d DE |
228 | } |
229 | ||
b5159817 DE |
230 | if (lxc_mainloop_add_handler(descr, console->master, |
231 | lxc_console_cb_con, console)) { | |
232 | ERROR("failed to add to mainloop console handler for '%d'", | |
233 | console->master); | |
234 | return -1; | |
28a4b0e5 DL |
235 | } |
236 | ||
b5159817 DE |
237 | /* we cache the descr so that we can add an fd to it when someone |
238 | * does attach to it in lxc_console_allocate() | |
239 | */ | |
240 | console->descr = descr; | |
241 | lxc_console_mainloop_add_peer(console); | |
cd453b38 | 242 | |
b5159817 DE |
243 | return 0; |
244 | } | |
28a4b0e5 | 245 | |
0d4137cc | 246 | int lxc_setup_tios(int fd, struct termios *oldtios) |
b5159817 DE |
247 | { |
248 | struct termios newtios; | |
e0dc0de7 | 249 | |
b5159817 DE |
250 | if (!isatty(fd)) { |
251 | ERROR("'%d' is not a tty", fd); | |
252 | return -1; | |
e0dc0de7 DL |
253 | } |
254 | ||
b5159817 DE |
255 | /* Get current termios */ |
256 | if (tcgetattr(fd, oldtios)) { | |
e0dc0de7 | 257 | SYSERROR("failed to get current terminal settings"); |
b5159817 | 258 | return -1; |
e0dc0de7 DL |
259 | } |
260 | ||
b5159817 | 261 | newtios = *oldtios; |
e0dc0de7 DL |
262 | |
263 | /* Remove the echo characters and signal reception, the echo | |
b5159817 | 264 | * will be done with master proxying */ |
d3893399 | 265 | newtios.c_iflag &= ~(IGNBRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON|IXANY|IXOFF); |
b5159817 | 266 | newtios.c_iflag &= BRKINT; |
d3893399 AJM |
267 | newtios.c_lflag &= ~(ECHO|ICANON|ISIG|IEXTEN|ECHOE|ECHOK|ECHONL); |
268 | newtios.c_oflag &= ~OPOST; | |
b5159817 DE |
269 | newtios.c_cc[VMIN] = 1; |
270 | newtios.c_cc[VTIME] = 0; | |
e0dc0de7 DL |
271 | |
272 | /* Set new attributes */ | |
b5159817 | 273 | if (tcsetattr(fd, TCSAFLUSH, &newtios)) { |
e0dc0de7 | 274 | ERROR("failed to set new terminal settings"); |
b5159817 | 275 | return -1; |
e0dc0de7 DL |
276 | } |
277 | ||
63376d7d | 278 | return 0; |
b5159817 | 279 | } |
e0dc0de7 | 280 | |
b5159817 DE |
281 | static void lxc_console_peer_proxy_free(struct lxc_console *console) |
282 | { | |
341c2aed | 283 | if (console->tty_state && console->tty_state->sigfd != -1) { |
b5159817 DE |
284 | lxc_console_sigwinch_fini(console->tty_state); |
285 | console->tty_state = NULL; | |
286 | } | |
287 | close(console->peerpty.master); | |
288 | close(console->peerpty.slave); | |
289 | console->peerpty.master = -1; | |
290 | console->peerpty.slave = -1; | |
291 | console->peerpty.busy = -1; | |
292 | console->peerpty.name[0] = '\0'; | |
596a818d | 293 | console->peer = -1; |
b5159817 | 294 | } |
596a818d | 295 | |
b5159817 DE |
296 | static int lxc_console_peer_proxy_alloc(struct lxc_console *console, int sockfd) |
297 | { | |
298 | struct termios oldtermio; | |
299 | struct lxc_tty_state *ts; | |
025ed0f3 | 300 | int ret; |
b5159817 DE |
301 | |
302 | if (console->master < 0) { | |
303 | ERROR("console not set up"); | |
304 | return -1; | |
305 | } | |
306 | if (console->peerpty.busy != -1 || console->peer != -1) { | |
307 | NOTICE("console already in use"); | |
308 | return -1; | |
309 | } | |
310 | if (console->tty_state) { | |
311 | ERROR("console already has tty_state"); | |
312 | return -1; | |
596a818d DE |
313 | } |
314 | ||
b5159817 DE |
315 | /* this is the proxy pty that will be given to the client, and that |
316 | * the real pty master will send to / recv from | |
317 | */ | |
025ed0f3 SH |
318 | process_lock(); |
319 | ret = openpty(&console->peerpty.master, &console->peerpty.slave, | |
320 | console->peerpty.name, NULL, NULL); | |
321 | process_unlock(); | |
322 | if (ret) { | |
b5159817 DE |
323 | SYSERROR("failed to create proxy pty"); |
324 | return -1; | |
325 | } | |
596a818d | 326 | |
0d4137cc | 327 | if (lxc_setup_tios(console->peerpty.slave, &oldtermio) < 0) |
b5159817 DE |
328 | goto err1; |
329 | ||
330 | ts = lxc_console_sigwinch_init(console->peerpty.master, console->master); | |
331 | if (!ts) | |
332 | goto err1; | |
333 | ||
334 | console->tty_state = ts; | |
335 | console->peer = console->peerpty.slave; | |
336 | console->peerpty.busy = sockfd; | |
337 | lxc_console_mainloop_add_peer(console); | |
338 | ||
339 | DEBUG("%d %s peermaster:%d sockfd:%d", getpid(), __FUNCTION__, console->peerpty.master, sockfd); | |
340 | return 0; | |
341 | ||
342 | err1: | |
343 | lxc_console_peer_proxy_free(console); | |
63376d7d DL |
344 | return -1; |
345 | } | |
346 | ||
b5159817 DE |
347 | int lxc_console_allocate(struct lxc_conf *conf, int sockfd, int *ttyreq) |
348 | { | |
349 | int masterfd = -1, ttynum; | |
350 | struct lxc_tty_info *tty_info = &conf->tty_info; | |
351 | struct lxc_console *console = &conf->console; | |
352 | ||
b5159817 DE |
353 | if (*ttyreq == 0) { |
354 | if (lxc_console_peer_proxy_alloc(console, sockfd) < 0) | |
355 | goto out; | |
356 | masterfd = console->peerpty.master; | |
357 | goto out; | |
358 | } | |
359 | ||
360 | if (*ttyreq > 0) { | |
361 | if (*ttyreq > tty_info->nbtty) | |
362 | goto out; | |
363 | ||
364 | if (tty_info->pty_info[*ttyreq - 1].busy) | |
365 | goto out; | |
366 | ||
367 | /* the requested tty is available */ | |
368 | ttynum = *ttyreq; | |
369 | goto out_tty; | |
370 | } | |
371 | ||
372 | /* search for next available tty, fixup index tty1 => [0] */ | |
0d4137cc CB |
373 | for (ttynum = 1; ttynum <= tty_info->nbtty && tty_info->pty_info[ttynum - 1].busy; ttynum++) |
374 | ; | |
b5159817 DE |
375 | |
376 | /* we didn't find any available slot for tty */ | |
377 | if (ttynum > tty_info->nbtty) | |
378 | goto out; | |
379 | ||
380 | *ttyreq = ttynum; | |
381 | ||
382 | out_tty: | |
383 | tty_info->pty_info[ttynum - 1].busy = sockfd; | |
384 | masterfd = tty_info->pty_info[ttynum - 1].master; | |
385 | out: | |
b5159817 DE |
386 | return masterfd; |
387 | } | |
388 | ||
b5159817 | 389 | void lxc_console_free(struct lxc_conf *conf, int fd) |
63376d7d | 390 | { |
b5159817 DE |
391 | int i; |
392 | struct lxc_tty_info *tty_info = &conf->tty_info; | |
393 | struct lxc_console *console = &conf->console; | |
394 | ||
b5159817 DE |
395 | for (i = 0; i < tty_info->nbtty; i++) { |
396 | if (tty_info->pty_info[i].busy == fd) | |
397 | tty_info->pty_info[i].busy = 0; | |
398 | } | |
399 | ||
400 | if (console->peerpty.busy == fd) { | |
401 | lxc_mainloop_del_handler(console->descr, console->peerpty.slave); | |
402 | lxc_console_peer_proxy_free(console); | |
403 | } | |
b5159817 DE |
404 | } |
405 | ||
406 | static void lxc_console_peer_default(struct lxc_console *console) | |
407 | { | |
408 | struct lxc_tty_state *ts; | |
409 | const char *path = console->path; | |
410 | ||
411 | /* if no console was given, try current controlling terminal, there | |
412 | * won't be one if we were started as a daemon (-d) | |
413 | */ | |
414 | if (!path && !access("/dev/tty", F_OK)) { | |
415 | int fd; | |
416 | fd = open("/dev/tty", O_RDWR); | |
417 | if (fd >= 0) { | |
418 | close(fd); | |
419 | path = "/dev/tty"; | |
420 | } | |
421 | } | |
422 | ||
423 | if (!path) | |
424 | goto out; | |
425 | ||
426 | DEBUG("opening %s for console peer", path); | |
427 | console->peer = lxc_unpriv(open(path, O_CLOEXEC | O_RDWR | O_CREAT | | |
428 | O_APPEND, 0600)); | |
429 | if (console->peer < 0) | |
430 | goto out; | |
431 | ||
432 | DEBUG("using '%s' as console", path); | |
433 | ||
434 | if (!isatty(console->peer)) | |
0d9acb99 | 435 | goto err1; |
b5159817 DE |
436 | |
437 | ts = lxc_console_sigwinch_init(console->peer, console->master); | |
b5159817 | 438 | console->tty_state = ts; |
341c2aed CB |
439 | if (!ts) { |
440 | WARN("Unable to install SIGWINCH"); | |
441 | goto err1; | |
442 | } | |
b5159817 DE |
443 | |
444 | lxc_console_winsz(console->peer, console->master); | |
445 | ||
446 | console->tios = malloc(sizeof(*console->tios)); | |
447 | if (!console->tios) { | |
448 | SYSERROR("failed to allocate memory"); | |
449 | goto err1; | |
450 | } | |
451 | ||
0d4137cc | 452 | if (lxc_setup_tios(console->peer, console->tios) < 0) |
b5159817 DE |
453 | goto err2; |
454 | ||
455 | return; | |
456 | ||
457 | err2: | |
458 | free(console->tios); | |
459 | console->tios = NULL; | |
460 | err1: | |
461 | close(console->peer); | |
462 | console->peer = -1; | |
463 | out: | |
464 | DEBUG("no console peer"); | |
341c2aed | 465 | return; |
b5159817 DE |
466 | } |
467 | ||
468 | void lxc_console_delete(struct lxc_console *console) | |
469 | { | |
470 | if (console->tios && console->peer >= 0 && | |
e0dc0de7 DL |
471 | tcsetattr(console->peer, TCSAFLUSH, console->tios)) |
472 | WARN("failed to set old terminal settings"); | |
596a818d DE |
473 | free(console->tios); |
474 | console->tios = NULL; | |
475 | ||
476 | close(console->peer); | |
025ed0f3 SH |
477 | close(console->master); |
478 | close(console->slave); | |
479 | if (console->log_fd >= 0) | |
596a818d | 480 | close(console->log_fd); |
596a818d | 481 | |
025ed0f3 | 482 | console->peer = -1; |
596a818d | 483 | console->master = -1; |
596a818d | 484 | console->slave = -1; |
025ed0f3 | 485 | console->log_fd = -1; |
63376d7d DL |
486 | } |
487 | ||
b5159817 | 488 | int lxc_console_create(struct lxc_conf *conf) |
63376d7d | 489 | { |
b5159817 | 490 | struct lxc_console *console = &conf->console; |
025ed0f3 | 491 | int ret; |
63376d7d | 492 | |
37903589 SH |
493 | if (conf->is_execute) { |
494 | INFO("no console for lxc-execute."); | |
495 | return 0; | |
496 | } | |
497 | ||
b5159817 DE |
498 | if (!conf->rootfs.path) |
499 | return 0; | |
500 | ||
501 | if (console->path && !strcmp(console->path, "none")) | |
502 | return 0; | |
503 | ||
025ed0f3 SH |
504 | process_lock(); |
505 | ret = openpty(&console->master, &console->slave, | |
506 | console->name, NULL, NULL); | |
507 | process_unlock(); | |
508 | if (ret) { | |
b5159817 DE |
509 | SYSERROR("failed to allocate a pty"); |
510 | return -1; | |
511 | } | |
512 | ||
513 | if (fcntl(console->master, F_SETFD, FD_CLOEXEC)) { | |
514 | SYSERROR("failed to set console master to close-on-exec"); | |
515 | goto err; | |
516 | } | |
517 | ||
518 | if (fcntl(console->slave, F_SETFD, FD_CLOEXEC)) { | |
519 | SYSERROR("failed to set console slave to close-on-exec"); | |
520 | goto err; | |
521 | } | |
522 | ||
523 | lxc_console_peer_default(console); | |
524 | ||
525 | if (console->log_path) { | |
526 | console->log_fd = lxc_unpriv(open(console->log_path, | |
527 | O_CLOEXEC | O_RDWR | | |
528 | O_CREAT | O_APPEND, 0600)); | |
529 | if (console->log_fd < 0) { | |
530 | SYSERROR("failed to open '%s'", console->log_path); | |
531 | goto err; | |
532 | } | |
533 | DEBUG("using '%s' as console log", console->log_path); | |
534 | } | |
535 | ||
536 | return 0; | |
537 | ||
538 | err: | |
539 | lxc_console_delete(console); | |
540 | return -1; | |
541 | } | |
542 | ||
39a78bbe | 543 | int lxc_console_set_stdfds(int fd) |
0d9acb99 | 544 | { |
39a78bbe | 545 | if (fd < 0) |
0d9acb99 | 546 | return 0; |
b5159817 | 547 | |
39a78bbe CB |
548 | if (isatty(STDIN_FILENO)) |
549 | if (dup2(fd, STDIN_FILENO) < 0) { | |
550 | SYSERROR("failed to duplicate stdin."); | |
551 | return -1; | |
552 | } | |
553 | ||
554 | if (isatty(STDOUT_FILENO)) | |
555 | if (dup2(fd, STDOUT_FILENO) < 0) { | |
556 | SYSERROR("failed to duplicate stdout."); | |
557 | return -1; | |
558 | } | |
559 | ||
560 | if (isatty(STDERR_FILENO)) | |
561 | if (dup2(fd, STDERR_FILENO) < 0) { | |
562 | SYSERROR("failed to duplicate stderr."); | |
563 | return -1; | |
564 | } | |
565 | ||
0d9acb99 DE |
566 | return 0; |
567 | } | |
b5159817 | 568 | |
0d4137cc CB |
569 | int lxc_console_cb_tty_stdin(int fd, uint32_t events, void *cbdata, |
570 | struct lxc_epoll_descr *descr) | |
b5159817 DE |
571 | { |
572 | struct lxc_tty_state *ts = cbdata; | |
573 | char c; | |
574 | ||
575 | assert(fd == ts->stdinfd); | |
e66b6c96 | 576 | if (lxc_read_nointr(ts->stdinfd, &c, 1) <= 0) |
63376d7d | 577 | return 1; |
63376d7d | 578 | |
014d5e1e CB |
579 | if (ts->escape != -1) { |
580 | /* we want to exit the console with Ctrl+a q */ | |
581 | if (c == ts->escape && !ts->saw_escape) { | |
582 | ts->saw_escape = 1; | |
583 | return 0; | |
584 | } | |
5c294060 | 585 | |
014d5e1e CB |
586 | if (c == 'q' && ts->saw_escape) |
587 | return 1; | |
588 | ||
589 | ts->saw_escape = 0; | |
590 | } | |
63376d7d | 591 | |
e66b6c96 | 592 | if (lxc_write_nointr(ts->masterfd, &c, 1) <= 0) |
b5159817 | 593 | return 1; |
b5159817 | 594 | |
63376d7d DL |
595 | return 0; |
596 | } | |
597 | ||
0d4137cc CB |
598 | int lxc_console_cb_tty_master(int fd, uint32_t events, void *cbdata, |
599 | struct lxc_epoll_descr *descr) | |
63376d7d | 600 | { |
b5159817 DE |
601 | struct lxc_tty_state *ts = cbdata; |
602 | char buf[1024]; | |
0d4137cc | 603 | int r, w; |
63376d7d | 604 | |
b5159817 | 605 | assert(fd == ts->masterfd); |
e66b6c96 CB |
606 | r = lxc_read_nointr(fd, buf, sizeof(buf)); |
607 | if (r <= 0) | |
b5159817 | 608 | return 1; |
1560f6c9 | 609 | |
e66b6c96 CB |
610 | w = lxc_write_nointr(ts->stdoutfd, buf, r); |
611 | if (w <= 0) { | |
612 | return 1; | |
613 | } else if (w != r) { | |
b5159817 DE |
614 | SYSERROR("failed to write"); |
615 | return 1; | |
f78a1f32 DL |
616 | } |
617 | ||
b5159817 DE |
618 | return 0; |
619 | } | |
620 | ||
621 | int lxc_console_getfd(struct lxc_container *c, int *ttynum, int *masterfd) | |
622 | { | |
623 | return lxc_cmd_console(c->name, ttynum, masterfd, c->config_path); | |
624 | } | |
625 | ||
626 | int lxc_console(struct lxc_container *c, int ttynum, | |
627 | int stdinfd, int stdoutfd, int stderrfd, | |
628 | int escape) | |
629 | { | |
630 | int ret, ttyfd, masterfd; | |
631 | struct lxc_epoll_descr descr; | |
632 | struct termios oldtios; | |
633 | struct lxc_tty_state *ts; | |
634 | ||
635 | if (!isatty(stdinfd)) { | |
636 | ERROR("stdin is not a tty"); | |
637 | return -1; | |
dff21ef0 DL |
638 | } |
639 | ||
0d4137cc | 640 | ret = lxc_setup_tios(stdinfd, &oldtios); |
b5159817 DE |
641 | if (ret) { |
642 | ERROR("failed to setup tios"); | |
63376d7d DL |
643 | return -1; |
644 | } | |
645 | ||
b5159817 DE |
646 | ttyfd = lxc_cmd_console(c->name, &ttynum, &masterfd, c->config_path); |
647 | if (ttyfd < 0) { | |
648 | ret = ttyfd; | |
649 | goto err1; | |
650 | } | |
63376d7d | 651 | |
b5159817 DE |
652 | fprintf(stderr, "\n" |
653 | "Connected to tty %1$d\n" | |
654 | "Type <Ctrl+%2$c q> to exit the console, " | |
655 | "<Ctrl+%2$c Ctrl+%2$c> to enter Ctrl+%2$c itself\n", | |
656 | ttynum, 'a' + escape - 1); | |
657 | ||
658 | ret = setsid(); | |
659 | if (ret) | |
660 | INFO("already group leader"); | |
661 | ||
662 | ts = lxc_console_sigwinch_init(stdinfd, masterfd); | |
663 | if (!ts) { | |
664 | ret = -1; | |
665 | goto err2; | |
666 | } | |
667 | ts->escape = escape; | |
668 | ts->winch_proxy = c->name; | |
669 | ts->winch_proxy_lxcpath = c->config_path; | |
670 | ||
671 | lxc_console_winsz(stdinfd, masterfd); | |
672 | lxc_cmd_console_winch(ts->winch_proxy, ts->winch_proxy_lxcpath); | |
673 | ||
674 | ret = lxc_mainloop_open(&descr); | |
675 | if (ret) { | |
676 | ERROR("failed to create mainloop"); | |
677 | goto err3; | |
678 | } | |
679 | ||
341c2aed CB |
680 | if (ts->sigfd != -1) { |
681 | ret = lxc_mainloop_add_handler(&descr, ts->sigfd, | |
682 | lxc_console_cb_sigwinch_fd, ts); | |
683 | if (ret) { | |
684 | ERROR("failed to add handler for SIGWINCH fd"); | |
685 | goto err4; | |
686 | } | |
b5159817 DE |
687 | } |
688 | ||
689 | ret = lxc_mainloop_add_handler(&descr, ts->stdinfd, | |
690 | lxc_console_cb_tty_stdin, ts); | |
691 | if (ret) { | |
692 | ERROR("failed to add handler for stdinfd"); | |
693 | goto err4; | |
694 | } | |
695 | ||
696 | ret = lxc_mainloop_add_handler(&descr, ts->masterfd, | |
697 | lxc_console_cb_tty_master, ts); | |
698 | if (ret) { | |
699 | ERROR("failed to add handler for masterfd"); | |
700 | goto err4; | |
701 | } | |
702 | ||
025ed0f3 | 703 | ret = lxc_mainloop(&descr, -1); |
b5159817 DE |
704 | if (ret) { |
705 | ERROR("mainloop returned an error"); | |
706 | goto err4; | |
707 | } | |
708 | ||
709 | ret = 0; | |
710 | ||
711 | err4: | |
712 | lxc_mainloop_close(&descr); | |
713 | err3: | |
341c2aed CB |
714 | if (ts->sigfd != -1) |
715 | lxc_console_sigwinch_fini(ts); | |
b5159817 DE |
716 | err2: |
717 | close(masterfd); | |
718 | close(ttyfd); | |
719 | err1: | |
720 | tcsetattr(stdinfd, TCSAFLUSH, &oldtios); | |
b5159817 DE |
721 | |
722 | return ret; | |
63376d7d | 723 | } |
0d4137cc | 724 |