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/*
* lxc: linux Container library
*
* (C) Copyright IBM Corp. 2007, 2008
*
* Authors:
* Daniel Lezcano <dlezcano at fr.ibm.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define _GNU_SOURCE
#include <stdio.h>
#undef _GNU_SOURCE
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <termios.h>
#include <unistd.h>
#include <signal.h>
#include <libgen.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/poll.h>
#include <lxc/error.h>
#include <lxc/lxc.h>
#include <lxc/log.h>
#include "arguments.h"
lxc_log_define(lxc_console, lxc);
static int my_parser(struct lxc_arguments* args, int c, char* arg)
{
switch (c) {
case 't': args->ttynum = atoi(arg); break;
}
return 0;
}
static const struct option my_longopts[] = {
{"tty", required_argument, 0, 't'},
LXC_COMMON_OPTIONS
};
static struct lxc_arguments my_args = {
.progname = "lxc-console",
.help = "\
--name=NAME [--tty NUMBER]\n\
\n\
lxc-console logs on the container with the identifier NAME\n\
\n\
Options :\n\
-n, --name=NAME NAME for name of the container\n\
-t, --tty=NUMBER console tty number\n",
.options = my_longopts,
.parser = my_parser,
.checker = NULL,
.ttynum = -1,
};
int main(int argc, char *argv[])
{
int master = -1;
int wait4q = 0;
int err;
struct termios tios, oldtios;
err = lxc_arguments_parse(&my_args, argc, argv);
if (err)
return -1;
if (lxc_log_init(my_args.log_file, my_args.log_priority,
my_args.progname, my_args.quiet))
return -1;
/* Get current termios */
if (tcgetattr(0, &tios)) {
ERROR("failed to get current terminal settings : %s",
strerror(errno));
return -1;
}
oldtios = tios;
/* Remove the echo characters and signal reception, the echo
* will be done below with master proxying */
tios.c_iflag &= ~IGNBRK;
tios.c_iflag &= BRKINT;
tios.c_lflag &= ~(ECHO|ICANON|ISIG);
tios.c_cc[VMIN] = 1;
tios.c_cc[VTIME] = 0;
/* Set new attributes */
if (tcsetattr(0, TCSAFLUSH, &tios)) {
ERROR("failed to set new terminal settings : %s",
strerror(errno));
return -1;
}
err = lxc_console(my_args.name, my_args.ttynum, &master);
if (err)
goto out;
fprintf(stderr, "\nType <Ctrl+a q> to exit the console\n");
setsid();
err = 0;
/* let's proxy the tty */
for (;;) {
char c;
struct pollfd pfd[2] = {
{ .fd = 0,
.events = POLLIN|POLLPRI,
.revents = 0 },
{ .fd = master,
.events = POLLIN|POLLPRI,
.revents = 0 },
};
if (poll(pfd, 2, -1) < 0) {
if (errno == EINTR)
continue;
SYSERROR("failed to poll");
goto out_err;
}
/* read the "stdin" and write that to the master
*/
if (pfd[0].revents & POLLIN) {
if (read(0, &c, 1) < 0) {
SYSERROR("failed to read");
goto out_err;
}
/* we want to exit the console with Ctrl+a q */
if (c == 1) {
wait4q = !wait4q;
continue;
}
if (c == 'q' && wait4q)
goto out;
wait4q = 0;
if (write(master, &c, 1) < 0) {
SYSERROR("failed to write");
goto out_err;
}
}
/* other side has closed the connection */
if (pfd[1].revents & POLLHUP)
goto out;
/* read the master and write to "stdout" */
if (pfd[1].revents & POLLIN) {
if (read(master, &c, 1) < 0) {
SYSERROR("failed to read");
goto out_err;
}
printf("%c", c);
fflush(stdout);
}
}
out:
/* Restore previous terminal parameter */
tcsetattr(0, TCSAFLUSH, &oldtios);
/* Return to line it is */
printf("\n");
close(master);
return err;
out_err:
err = -1;
goto out;
}
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