]>
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2 * lxc: linux Container library
4 * (C) Copyright IBM Corp. 2007, 2008
7 * Daniel Lezcano <daniel.lezcano at free.fr>
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.
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.
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
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include <lxc/lxccontainer.h>
32 #include <sys/epoll.h>
33 #include <sys/types.h>
52 #include <../include/openpty.h>
55 #define LXC_TERMINAL_BUFFER_SIZE 1024
57 lxc_log_define(terminal
, lxc
);
59 static struct lxc_list lxc_ttys
;
61 typedef void (*sighandler_t
)(int);
63 __attribute__((constructor
)) void lxc_terminal_init_global(void)
65 lxc_list_init(&lxc_ttys
);
68 void lxc_terminal_winsz(int srcfd
, int dstfd
)
76 ret
= ioctl(srcfd
, TIOCGWINSZ
, &wsz
);
78 WARN("Failed to get window size");
82 ret
= ioctl(dstfd
, TIOCSWINSZ
, &wsz
);
84 WARN("Failed to set window size");
86 DEBUG("Set window size to %d columns and %d rows", wsz
.ws_col
,
92 static void lxc_terminal_winch(struct lxc_terminal_state
*ts
)
94 lxc_terminal_winsz(ts
->stdinfd
, ts
->masterfd
);
97 lxc_cmd_terminal_winch(ts
->winch_proxy
, ts
->winch_proxy_lxcpath
);
100 void lxc_terminal_sigwinch(int sig
)
103 struct lxc_terminal_state
*ts
;
105 lxc_list_for_each(it
, &lxc_ttys
) {
107 lxc_terminal_winch(ts
);
111 int lxc_terminal_signalfd_cb(int fd
, uint32_t events
, void *cbdata
,
112 struct lxc_epoll_descr
*descr
)
115 struct signalfd_siginfo siginfo
;
116 struct lxc_terminal_state
*ts
= cbdata
;
118 ret
= lxc_read_nointr(fd
, &siginfo
, sizeof(siginfo
));
119 if (ret
< 0 || (size_t)ret
< sizeof(siginfo
)) {
120 ERROR("Failed to read signal info");
121 return LXC_MAINLOOP_ERROR
;
124 if (siginfo
.ssi_signo
== SIGTERM
) {
125 DEBUG("Received SIGTERM. Detaching from the terminal");
126 return LXC_MAINLOOP_CLOSE
;
129 if (siginfo
.ssi_signo
== SIGWINCH
)
130 lxc_terminal_winch(ts
);
132 return LXC_MAINLOOP_CONTINUE
;
135 struct lxc_terminal_state
*lxc_terminal_signal_init(int srcfd
, int dstfd
)
140 struct lxc_terminal_state
*ts
;
142 ts
= malloc(sizeof(*ts
));
146 memset(ts
, 0, sizeof(*ts
));
148 ts
->masterfd
= dstfd
;
151 ret
= sigemptyset(&mask
);
153 SYSERROR("Failed to initialize an empty signal set");
157 istty
= (isatty(srcfd
) == 1);
159 INFO("fd %d does not refer to a tty device", srcfd
);
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
);
164 ret
= sigaddset(&mask
, SIGWINCH
);
166 SYSNOTICE("Failed to add SIGWINCH to signal set");
169 /* Exit the mainloop cleanly on SIGTERM. */
170 ret
= sigaddset(&mask
, SIGTERM
);
172 SYSERROR("Failed to add SIGWINCH to signal set");
176 ret
= pthread_sigmask(SIG_BLOCK
, &mask
, &ts
->oldmask
);
178 WARN("Failed to block signals");
182 ts
->sigfd
= signalfd(-1, &mask
, SFD_CLOEXEC
);
184 WARN("Failed to create signal fd");
185 (void)pthread_sigmask(SIG_SETMASK
, &ts
->oldmask
, NULL
);
189 DEBUG("Created signal fd %d", ts
->sigfd
);
193 ERROR("Failed to create signal fd");
194 if (ts
->sigfd
>= 0) {
200 lxc_list_del(&ts
->node
);
205 void lxc_terminal_signal_fini(struct lxc_terminal_state
*ts
)
207 if (ts
->sigfd
>= 0) {
210 if (pthread_sigmask(SIG_SETMASK
, &ts
->oldmask
, NULL
) < 0)
211 SYSWARN("Failed to restore signal mask");
214 if (isatty(ts
->stdinfd
))
215 lxc_list_del(&ts
->node
);
220 static int lxc_terminal_truncate_log_file(struct lxc_terminal
*terminal
)
222 /* be very certain things are kosher */
223 if (!terminal
->log_path
|| terminal
->log_fd
< 0)
226 return lxc_unpriv(ftruncate(terminal
->log_fd
, 0));
229 static int lxc_terminal_rotate_log_file(struct lxc_terminal
*terminal
)
235 if (!terminal
->log_path
|| terminal
->log_rotate
== 0)
238 /* be very certain things are kosher */
239 if (terminal
->log_fd
< 0)
242 len
= strlen(terminal
->log_path
) + sizeof(".1");
245 ret
= snprintf(tmp
, len
, "%s.1", terminal
->log_path
);
246 if (ret
< 0 || (size_t)ret
>= len
)
249 close(terminal
->log_fd
);
250 terminal
->log_fd
= -1;
251 ret
= lxc_unpriv(rename(terminal
->log_path
, tmp
));
255 return lxc_terminal_create_log_file(terminal
);
258 static int lxc_terminal_write_log_file(struct lxc_terminal
*terminal
, char *buf
,
263 int64_t space_left
= -1;
265 if (terminal
->log_fd
< 0)
268 /* A log size <= 0 means that there's no limit on the size of the log
269 * file at which point we simply ignore whether the log is supposed to
272 if (terminal
->log_size
<= 0)
273 return lxc_write_nointr(terminal
->log_fd
, buf
, bytes_read
);
275 /* Get current size of the log file. */
276 ret
= fstat(terminal
->log_fd
, &st
);
278 SYSERROR("Failed to stat the terminal log file descriptor");
282 /* handle non-regular files */
283 if ((st
.st_mode
& S_IFMT
) != S_IFREG
) {
284 /* This isn't a regular file. so rotating the file seems a
285 * dangerous thing to do, size limits are also very
286 * questionable. Let's not risk anything and tell the user that
287 * he's requesting us to do weird stuff.
289 if (terminal
->log_rotate
> 0 || terminal
->log_size
> 0)
292 /* I mean, sure log wherever you want to. */
293 return lxc_write_nointr(terminal
->log_fd
, buf
, bytes_read
);
296 space_left
= terminal
->log_size
- st
.st_size
;
298 /* User doesn't want to rotate the log file and there's no more space
299 * left so simply truncate it.
301 if (space_left
<= 0 && terminal
->log_rotate
<= 0) {
302 ret
= lxc_terminal_truncate_log_file(terminal
);
306 if (bytes_read
<= terminal
->log_size
)
307 return lxc_write_nointr(terminal
->log_fd
, buf
, bytes_read
);
309 /* Write as much as we can into the buffer and loose the rest. */
310 return lxc_write_nointr(terminal
->log_fd
, buf
, terminal
->log_size
);
313 /* There's enough space left. */
314 if (bytes_read
<= space_left
)
315 return lxc_write_nointr(terminal
->log_fd
, buf
, bytes_read
);
317 /* There's not enough space left but at least write as much as we can
318 * into the old log file.
320 ret
= lxc_write_nointr(terminal
->log_fd
, buf
, space_left
);
324 /* Calculate how many bytes we still need to write. */
325 bytes_read
-= space_left
;
327 /* There'd be more to write but we aren't instructed to rotate the log
328 * file so simply return. There's no error on our side here.
330 if (terminal
->log_rotate
> 0)
331 ret
= lxc_terminal_rotate_log_file(terminal
);
333 ret
= lxc_terminal_truncate_log_file(terminal
);
337 if (terminal
->log_size
< bytes_read
) {
338 /* Well, this is unfortunate because it means that there is more
339 * to write than the user has granted us space. There are
340 * multiple ways to handle this but let's use the simplest one:
341 * write as much as we can, tell the user that there was more
342 * stuff to write and move on.
343 * Note that this scenario shouldn't actually happen with the
344 * standard pty-based terminal that LXC allocates since it will
345 * be switched into raw mode. In raw mode only 1 byte at a time
346 * should be read and written.
348 WARN("Size of terminal log file is smaller than the bytes to write");
349 ret
= lxc_write_nointr(terminal
->log_fd
, buf
, terminal
->log_size
);
356 /* Yay, we made it. */
357 ret
= lxc_write_nointr(terminal
->log_fd
, buf
, bytes_read
);
364 int lxc_terminal_io_cb(int fd
, uint32_t events
, void *data
,
365 struct lxc_epoll_descr
*descr
)
367 struct lxc_terminal
*terminal
= data
;
368 char buf
[LXC_TERMINAL_BUFFER_SIZE
];
369 int r
, w
, w_log
, w_rbuf
;
371 w
= r
= lxc_read_nointr(fd
, buf
, sizeof(buf
));
373 INFO("Terminal client on fd %d has exited", fd
);
374 lxc_mainloop_del_handler(descr
, fd
);
376 if (fd
== terminal
->master
) {
377 terminal
->master
= -EBADF
;
378 } else if (fd
== terminal
->peer
) {
379 if (terminal
->tty_state
) {
380 lxc_terminal_signal_fini(terminal
->tty_state
);
381 terminal
->tty_state
= NULL
;
383 terminal
->peer
= -EBADF
;
385 ERROR("Handler received unexpected file descriptor");
389 return LXC_MAINLOOP_CLOSE
;
392 if (fd
== terminal
->peer
)
393 w
= lxc_write_nointr(terminal
->master
, buf
, r
);
396 if (fd
== terminal
->master
) {
397 /* write to peer first */
398 if (terminal
->peer
>= 0)
399 w
= lxc_write_nointr(terminal
->peer
, buf
, r
);
401 /* write to terminal ringbuffer */
402 if (terminal
->buffer_size
> 0)
403 w_rbuf
= lxc_ringbuf_write(&terminal
->ringbuf
, buf
, r
);
405 /* write to terminal log */
406 if (terminal
->log_fd
>= 0)
407 w_log
= lxc_terminal_write_log_file(terminal
, buf
, r
);
411 WARN("Short write on terminal r:%d != w:%d", r
, w
);
415 SYSTRACE("Failed to write %d bytes to terminal ringbuffer", r
);
419 TRACE("Failed to write %d bytes to terminal log", r
);
421 return LXC_MAINLOOP_CONTINUE
;
424 static int lxc_terminal_mainloop_add_peer(struct lxc_terminal
*terminal
)
428 if (terminal
->peer
>= 0) {
429 ret
= lxc_mainloop_add_handler(terminal
->descr
, terminal
->peer
,
430 lxc_terminal_io_cb
, terminal
);
432 WARN("Failed to add terminal peer handler to mainloop");
437 if (!terminal
->tty_state
|| terminal
->tty_state
->sigfd
< 0)
440 ret
= lxc_mainloop_add_handler(terminal
->descr
, terminal
->tty_state
->sigfd
,
441 lxc_terminal_signalfd_cb
, terminal
->tty_state
);
443 WARN("Failed to add signal handler to mainloop");
450 int lxc_terminal_mainloop_add(struct lxc_epoll_descr
*descr
,
451 struct lxc_terminal
*terminal
)
455 if (terminal
->master
< 0) {
456 INFO("Terminal is not initialized");
460 ret
= lxc_mainloop_add_handler(descr
, terminal
->master
,
461 lxc_terminal_io_cb
, terminal
);
463 ERROR("Failed to add handler for terminal master fd %d to "
464 "mainloop", terminal
->master
);
468 /* We cache the descr so that we can add an fd to it when someone
469 * does attach to it in lxc_terminal_allocate().
471 terminal
->descr
= descr
;
473 return lxc_terminal_mainloop_add_peer(terminal
);
476 int lxc_setup_tios(int fd
, struct termios
*oldtios
)
479 struct termios newtios
;
482 ERROR("File descriptor %d does not refert to a terminal", fd
);
486 /* Get current termios. */
487 ret
= tcgetattr(fd
, oldtios
);
489 SYSERROR("Failed to get current terminal settings");
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.
498 signal (SIGTTIN
, SIG_IGN
);
499 signal (SIGTTOU
, SIG_IGN
);
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
);
507 newtios
.c_iflag
&= ~IUCLC
;
509 newtios
.c_lflag
&= ~(TOSTOP
| ISIG
| ICANON
| ECHO
| ECHOE
| ECHOK
| ECHONL
);
511 newtios
.c_lflag
&= ~IEXTEN
;
513 newtios
.c_oflag
&= ~ONLCR
;
514 newtios
.c_oflag
|= OPOST
;
515 newtios
.c_cc
[VMIN
] = 1;
516 newtios
.c_cc
[VTIME
] = 0;
518 /* Set new attributes. */
519 ret
= tcsetattr(fd
, TCSAFLUSH
, &newtios
);
521 ERROR("Failed to set new terminal settings");
528 static void lxc_terminal_peer_proxy_free(struct lxc_terminal
*terminal
)
530 if (terminal
->tty_state
) {
531 lxc_terminal_signal_fini(terminal
->tty_state
);
532 terminal
->tty_state
= NULL
;
535 close(terminal
->proxy
.master
);
536 terminal
->proxy
.master
= -1;
538 close(terminal
->proxy
.slave
);
539 terminal
->proxy
.slave
= -1;
541 terminal
->proxy
.busy
= -1;
543 terminal
->proxy
.name
[0] = '\0';
548 static int lxc_terminal_peer_proxy_alloc(struct lxc_terminal
*terminal
,
552 struct termios oldtermio
;
553 struct lxc_terminal_state
*ts
;
555 if (terminal
->master
< 0) {
556 ERROR("Terminal not set up");
560 if (terminal
->proxy
.busy
!= -1 || terminal
->peer
!= -1) {
561 NOTICE("Terminal already in use");
565 if (terminal
->tty_state
) {
566 ERROR("Terminal has already been initialized");
570 /* This is the proxy terminal that will be given to the client, and
571 * that the real terminal master will send to / recv from.
573 ret
= openpty(&terminal
->proxy
.master
, &terminal
->proxy
.slave
, NULL
,
576 SYSERROR("Failed to open proxy terminal");
580 ret
= ttyname_r(terminal
->proxy
.slave
, terminal
->proxy
.name
,
581 sizeof(terminal
->proxy
.name
));
583 SYSERROR("Failed to retrieve name of proxy terminal slave");
587 ret
= fd_cloexec(terminal
->proxy
.master
, true);
589 SYSERROR("Failed to set FD_CLOEXEC flag on proxy terminal master");
593 ret
= fd_cloexec(terminal
->proxy
.slave
, true);
595 SYSERROR("Failed to set FD_CLOEXEC flag on proxy terminal slave");
599 ret
= lxc_setup_tios(terminal
->proxy
.slave
, &oldtermio
);
603 ts
= lxc_terminal_signal_init(terminal
->proxy
.master
, terminal
->master
);
607 terminal
->tty_state
= ts
;
608 terminal
->peer
= terminal
->proxy
.slave
;
609 terminal
->proxy
.busy
= sockfd
;
610 ret
= lxc_terminal_mainloop_add_peer(terminal
);
614 NOTICE("Opened proxy terminal with master fd %d and slave fd %d",
615 terminal
->proxy
.master
, terminal
->proxy
.slave
);
619 lxc_terminal_peer_proxy_free(terminal
);
623 int lxc_terminal_allocate(struct lxc_conf
*conf
, int sockfd
, int *ttyreq
)
627 struct lxc_tty_info
*ttys
= &conf
->ttys
;
628 struct lxc_terminal
*terminal
= &conf
->console
;
633 ret
= lxc_terminal_peer_proxy_alloc(terminal
, sockfd
);
637 masterfd
= terminal
->proxy
.master
;
642 if (*ttyreq
> ttys
->max
)
645 if (ttys
->tty
[*ttyreq
- 1].busy
)
648 /* The requested tty is available. */
653 /* Search for next available tty, fixup index tty1 => [0]. */
654 for (ttynum
= 1; ttynum
<= ttys
->max
&& ttys
->tty
[ttynum
- 1].busy
; ttynum
++) {
658 /* We didn't find any available slot for tty. */
659 if (ttynum
> ttys
->max
)
665 ttys
->tty
[ttynum
- 1].busy
= sockfd
;
666 masterfd
= ttys
->tty
[ttynum
- 1].master
;
672 void lxc_terminal_free(struct lxc_conf
*conf
, int fd
)
675 struct lxc_tty_info
*ttys
= &conf
->ttys
;
676 struct lxc_terminal
*terminal
= &conf
->console
;
678 for (i
= 0; i
< ttys
->max
; i
++)
679 if (ttys
->tty
[i
].busy
== fd
)
680 ttys
->tty
[i
].busy
= 0;
682 if (terminal
->proxy
.busy
!= fd
)
685 lxc_mainloop_del_handler(terminal
->descr
, terminal
->proxy
.slave
);
686 lxc_terminal_peer_proxy_free(terminal
);
689 static int lxc_terminal_peer_default(struct lxc_terminal
*terminal
)
691 struct lxc_terminal_state
*ts
;
696 path
= terminal
->path
;
700 terminal
->peer
= lxc_unpriv(open(path
, O_RDWR
| O_CLOEXEC
));
701 if (terminal
->peer
< 0) {
702 if (!terminal
->path
) {
704 SYSDEBUG("The process does not have a controlling terminal");
708 SYSERROR("Failed to open proxy terminal \"%s\"", path
);
711 DEBUG("Using terminal \"%s\" as proxy", path
);
713 if (!isatty(terminal
->peer
)) {
714 ERROR("File descriptor for \"%s\" does not refer to a terminal", path
);
715 goto on_error_free_tios
;
718 ts
= lxc_terminal_signal_init(terminal
->peer
, terminal
->master
);
719 terminal
->tty_state
= ts
;
721 WARN("Failed to install signal handler");
722 goto on_error_free_tios
;
725 lxc_terminal_winsz(terminal
->peer
, terminal
->master
);
727 terminal
->tios
= malloc(sizeof(*terminal
->tios
));
729 goto on_error_free_tios
;
731 ret
= lxc_setup_tios(terminal
->peer
, terminal
->tios
);
733 goto on_error_close_peer
;
738 free(terminal
->tios
);
739 terminal
->tios
= NULL
;
742 close(terminal
->peer
);
750 int lxc_terminal_write_ringbuffer(struct lxc_terminal
*terminal
)
755 struct lxc_ringbuf
*buf
= &terminal
->ringbuf
;
757 /* There's not log file where we can dump the ringbuffer to. */
758 if (terminal
->log_fd
< 0)
761 used
= lxc_ringbuf_used(buf
);
765 ret
= lxc_terminal_truncate_log_file(terminal
);
769 /* Write as much as we can without exceeding the limit. */
770 if (terminal
->log_size
< used
)
771 used
= terminal
->log_size
;
773 r_addr
= lxc_ringbuf_get_read_addr(buf
);
774 ret
= lxc_write_nointr(terminal
->log_fd
, r_addr
, used
);
781 void lxc_terminal_delete(struct lxc_terminal
*terminal
)
785 ret
= lxc_terminal_write_ringbuffer(terminal
);
787 WARN("Failed to write terminal log to disk");
789 if (terminal
->tios
&& terminal
->peer
>= 0) {
790 ret
= tcsetattr(terminal
->peer
, TCSAFLUSH
, terminal
->tios
);
792 SYSWARN("Failed to set old terminal settings");
794 free(terminal
->tios
);
795 terminal
->tios
= NULL
;
797 if (terminal
->peer
>= 0)
798 close(terminal
->peer
);
801 if (terminal
->master
>= 0)
802 close(terminal
->master
);
803 terminal
->master
= -1;
805 if (terminal
->slave
>= 0)
806 close(terminal
->slave
);
807 terminal
->slave
= -1;
809 if (terminal
->log_fd
>= 0)
810 close(terminal
->log_fd
);
811 terminal
->log_fd
= -1;
815 * Note that this function needs to run before the mainloop starts. Since we
816 * register a handler for the terminal's masterfd when we create the mainloop
817 * the terminal handler needs to see an allocated ringbuffer.
819 static int lxc_terminal_create_ringbuf(struct lxc_terminal
*terminal
)
822 struct lxc_ringbuf
*buf
= &terminal
->ringbuf
;
823 uint64_t size
= terminal
->buffer_size
;
825 /* no ringbuffer previously allocated and no ringbuffer requested */
826 if (!buf
->addr
&& size
<= 0)
829 /* ringbuffer allocated but no new ringbuffer requested */
830 if (buf
->addr
&& size
<= 0) {
831 lxc_ringbuf_release(buf
);
836 TRACE("Deallocated terminal ringbuffer");
843 /* check wether the requested size for the ringbuffer has changed */
844 if (buf
->addr
&& buf
->size
!= size
) {
845 TRACE("Terminal ringbuffer size changed from %" PRIu64
846 " to %" PRIu64
" bytes. Deallocating terminal ringbuffer",
848 lxc_ringbuf_release(buf
);
851 ret
= lxc_ringbuf_create(buf
, size
);
853 ERROR("Failed to setup %" PRIu64
" byte terminal ringbuffer", size
);
857 TRACE("Allocated %" PRIu64
" byte terminal ringbuffer", size
);
862 * This is the terminal log file. Please note that the terminal log file is
863 * (implementation wise not content wise) independent of the terminal ringbuffer.
865 int lxc_terminal_create_log_file(struct lxc_terminal
*terminal
)
867 if (!terminal
->log_path
)
870 terminal
->log_fd
= lxc_unpriv(open(terminal
->log_path
, O_CLOEXEC
| O_RDWR
| O_CREAT
| O_APPEND
, 0600));
871 if (terminal
->log_fd
< 0) {
872 SYSERROR("Failed to open terminal log file \"%s\"", terminal
->log_path
);
876 DEBUG("Using \"%s\" as terminal log file", terminal
->log_path
);
880 int lxc_terminal_create(struct lxc_terminal
*terminal
)
884 ret
= openpty(&terminal
->master
, &terminal
->slave
, NULL
, NULL
, NULL
);
886 SYSERROR("Failed to open terminal");
890 ret
= ttyname_r(terminal
->slave
, terminal
->name
, sizeof(terminal
->name
));
892 SYSERROR("Failed to retrieve name of terminal slave");
896 ret
= fd_cloexec(terminal
->master
, true);
898 SYSERROR("Failed to set FD_CLOEXEC flag on terminal master");
902 ret
= fd_cloexec(terminal
->slave
, true);
904 SYSERROR("Failed to set FD_CLOEXEC flag on terminal slave");
908 ret
= lxc_terminal_peer_default(terminal
);
910 ERROR("Failed to allocate proxy terminal");
917 lxc_terminal_delete(terminal
);
921 int lxc_terminal_setup(struct lxc_conf
*conf
)
924 struct lxc_terminal
*terminal
= &conf
->console
;
926 if (terminal
->path
&& strcmp(terminal
->path
, "none") == 0) {
927 INFO("No terminal requested");
931 ret
= lxc_terminal_create(terminal
);
935 ret
= lxc_terminal_create_log_file(terminal
);
939 ret
= lxc_terminal_create_ringbuf(terminal
);
946 lxc_terminal_delete(terminal
);
950 static bool __terminal_dup2(int duplicate
, int original
)
954 if (!isatty(original
))
957 ret
= dup2(duplicate
, original
);
959 SYSERROR("Failed to dup2(%d, %d)", duplicate
, original
);
966 int lxc_terminal_set_stdfds(int fd
)
973 for (i
= 0; i
< 3; i
++)
974 if (!__terminal_dup2(fd
, (int[]){STDIN_FILENO
, STDOUT_FILENO
,
981 int lxc_terminal_stdin_cb(int fd
, uint32_t events
, void *cbdata
,
982 struct lxc_epoll_descr
*descr
)
986 struct lxc_terminal_state
*ts
= cbdata
;
988 if (fd
!= ts
->stdinfd
)
989 return LXC_MAINLOOP_CLOSE
;
991 ret
= lxc_read_nointr(ts
->stdinfd
, &c
, 1);
993 return LXC_MAINLOOP_CLOSE
;
995 if (ts
->escape
>= 1) {
996 /* we want to exit the terminal with Ctrl+a q */
997 if (c
== ts
->escape
&& !ts
->saw_escape
) {
999 return LXC_MAINLOOP_CONTINUE
;
1002 if (c
== 'q' && ts
->saw_escape
)
1003 return LXC_MAINLOOP_CLOSE
;
1008 ret
= lxc_write_nointr(ts
->masterfd
, &c
, 1);
1010 return LXC_MAINLOOP_CLOSE
;
1012 return LXC_MAINLOOP_CONTINUE
;
1015 int lxc_terminal_master_cb(int fd
, uint32_t events
, void *cbdata
,
1016 struct lxc_epoll_descr
*descr
)
1019 char buf
[LXC_TERMINAL_BUFFER_SIZE
];
1020 struct lxc_terminal_state
*ts
= cbdata
;
1022 if (fd
!= ts
->masterfd
)
1023 return LXC_MAINLOOP_CLOSE
;
1025 r
= lxc_read_nointr(fd
, buf
, sizeof(buf
));
1027 return LXC_MAINLOOP_CLOSE
;
1029 w
= lxc_write_nointr(ts
->stdoutfd
, buf
, r
);
1030 if (w
<= 0 || w
!= r
)
1031 return LXC_MAINLOOP_CLOSE
;
1033 return LXC_MAINLOOP_CONTINUE
;
1036 int lxc_terminal_getfd(struct lxc_container
*c
, int *ttynum
, int *masterfd
)
1038 return lxc_cmd_console(c
->name
, ttynum
, masterfd
, c
->config_path
);
1041 int lxc_console(struct lxc_container
*c
, int ttynum
,
1042 int stdinfd
, int stdoutfd
, int stderrfd
,
1045 int masterfd
, ret
, ttyfd
;
1046 struct lxc_epoll_descr descr
;
1047 struct termios oldtios
;
1048 struct lxc_terminal_state
*ts
;
1051 ttyfd
= lxc_cmd_console(c
->name
, &ttynum
, &masterfd
, c
->config_path
);
1057 TRACE("Process is already group leader");
1059 ts
= lxc_terminal_signal_init(stdinfd
, masterfd
);
1064 ts
->escape
= escape
;
1065 ts
->winch_proxy
= c
->name
;
1066 ts
->winch_proxy_lxcpath
= c
->config_path
;
1067 ts
->stdoutfd
= stdoutfd
;
1069 istty
= isatty(stdinfd
);
1071 lxc_terminal_winsz(stdinfd
, masterfd
);
1072 lxc_cmd_terminal_winch(ts
->winch_proxy
, ts
->winch_proxy_lxcpath
);
1074 INFO("File descriptor %d does not refer to a terminal", stdinfd
);
1077 ret
= lxc_mainloop_open(&descr
);
1079 ERROR("Failed to create mainloop");
1083 if (ts
->sigfd
!= -1) {
1084 ret
= lxc_mainloop_add_handler(&descr
, ts
->sigfd
,
1085 lxc_terminal_signalfd_cb
, ts
);
1087 ERROR("Failed to add signal handler to mainloop");
1088 goto close_mainloop
;
1092 ret
= lxc_mainloop_add_handler(&descr
, ts
->stdinfd
,
1093 lxc_terminal_stdin_cb
, ts
);
1095 ERROR("Failed to add stdin handler");
1096 goto close_mainloop
;
1099 ret
= lxc_mainloop_add_handler(&descr
, ts
->masterfd
,
1100 lxc_terminal_master_cb
, ts
);
1102 ERROR("Failed to add master handler");
1103 goto close_mainloop
;
1106 if (ts
->escape
>= 1) {
1109 "Connected to tty %1$d\n"
1110 "Type <Ctrl+%2$c q> to exit the console, "
1111 "<Ctrl+%2$c Ctrl+%2$c> to enter Ctrl+%2$c itself\n",
1112 ttynum
, 'a' + escape
- 1);
1116 ret
= lxc_setup_tios(stdinfd
, &oldtios
);
1118 goto close_mainloop
;
1121 ret
= lxc_mainloop(&descr
, -1);
1123 ERROR("The mainloop returned an error");
1131 istty
= tcsetattr(stdinfd
, TCSAFLUSH
, &oldtios
);
1133 SYSWARN("Failed to restore terminal properties");
1137 lxc_mainloop_close(&descr
);
1140 lxc_terminal_signal_fini(ts
);
1149 int lxc_make_controlling_terminal(int fd
)
1155 ret
= ioctl(fd
, TIOCSCTTY
, (char *)NULL
);
1162 int lxc_terminal_prepare_login(int fd
)
1166 ret
= lxc_make_controlling_terminal(fd
);
1170 ret
= lxc_terminal_set_stdfds(fd
);
1174 if (fd
> STDERR_FILENO
)
1180 void lxc_terminal_info_init(struct lxc_terminal_info
*terminal
)
1182 terminal
->name
[0] = '\0';
1183 terminal
->master
= -EBADF
;
1184 terminal
->slave
= -EBADF
;
1185 terminal
->busy
= -1;
1188 void lxc_terminal_init(struct lxc_terminal
*terminal
)
1190 memset(terminal
, 0, sizeof(*terminal
));
1191 terminal
->slave
= -EBADF
;
1192 terminal
->master
= -EBADF
;
1193 terminal
->peer
= -EBADF
;
1194 terminal
->log_fd
= -EBADF
;
1195 lxc_terminal_info_init(&terminal
->proxy
);
1198 void lxc_terminal_conf_free(struct lxc_terminal
*terminal
)
1200 free(terminal
->log_path
);
1201 free(terminal
->path
);
1202 if (terminal
->buffer_size
> 0 && terminal
->ringbuf
.addr
)
1203 lxc_ringbuf_release(&terminal
->ringbuf
);
1206 int lxc_terminal_map_ids(struct lxc_conf
*c
, struct lxc_terminal
*terminal
)
1210 if (lxc_list_empty(&c
->id_map
))
1213 if (strcmp(terminal
->name
, "") == 0)
1216 ret
= chown_mapped_root(terminal
->name
, c
);
1218 ERROR("Failed to chown terminal \"%s\"", terminal
->name
);
1222 TRACE("Chowned terminal \"%s\"", terminal
->name
);