src/lxc/lxc_console.c

   1 /*
   2  * lxc: linux Container library
   3  *
   4  * (C) Copyright IBM Corp. 2007, 2008
   5  *
   6  * Authors:
   7  * Daniel Lezcano <daniel.lezcano at free.fr>
   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
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 #define _GNU_SOURCE
  25 #include <stdio.h>
  26 #undef _GNU_SOURCE
  27 #include <stdlib.h>
  28 #include <errno.h>
  29 #include <string.h>
  30 #include <fcntl.h>
  31 #include <termios.h>
  32 #include <unistd.h>
  33 #include <signal.h>
  34 #include <libgen.h>
  35 #include <sys/param.h>
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <sys/poll.h>
  39 #include <sys/ioctl.h>
  40
  41 #include "../lxc/lxccontainer.h"
  42 #include "error.h"
  43 #include "lxc.h"
  44 #include "log.h"
  45 #include "mainloop.h"
  46 #include "arguments.h"
  47 #include "commands.h"
  48
  49 lxc_log_define(lxc_console_ui, lxc_console);
  50
  51 static char etoc(const char *expr)
  52 {
  53         /* returns "control code" of given expression */
  54         char c = expr[0] == '^' ? expr[1] : expr[0];
  55         return 1 + ((c > 'Z') ? (c - 'a') : (c - 'Z'));
  56 }
  57
  58 static int my_parser(struct lxc_arguments* args, int c, char* arg)
  59 {
  60         switch (c) {
  61         case 't': args->ttynum = atoi(arg); break;
  62         case 'e': args->escape = etoc(arg); break;
  63         }
  64         return 0;
  65 }
  66
  67 static const struct option my_longopts[] = {
  68         {"tty", required_argument, 0, 't'},
  69         {"escape", required_argument, 0, 'e'},
  70         LXC_COMMON_OPTIONS
  71 };
  72
  73 static struct lxc_arguments my_args = {
  74         .progname = "lxc-console",
  75         .help     = "\
  76 --name=NAME [--tty NUMBER]\n\
  77 \n\
  78 lxc-console logs on the container with the identifier NAME\n\
  79 \n\
  80 Options :\n\
  81   -n, --name=NAME      NAME for name of the container\n\
  82   -t, --tty=NUMBER     console tty number\n\
  83   -e, --escape=PREFIX  prefix for escape command\n",
  84         .options  = my_longopts,
  85         .parser   = my_parser,
  86         .checker  = NULL,
  87         .ttynum = -1,
  88         .escape = 1,
  89 };
  90
  91 int main(int argc, char *argv[])
  92 {
  93         int ret;
  94         struct lxc_container *c;
  95
  96         ret = lxc_arguments_parse(&my_args, argc, argv);
  97         if (ret)
  98                 return EXIT_FAILURE;
  99
 100         ret = lxc_log_init(my_args.name, my_args.log_file, my_args.log_priority,
 101                            my_args.progname, my_args.quiet, my_args.lxcpath[0]);
 102         if (ret)
 103                 return EXIT_FAILURE;
 104
 105         c = lxc_container_new(my_args.name, my_args.lxcpath[0]);
 106         if (!c) {
 107                 fprintf(stderr, "System error loading container\n");
 108                 exit(EXIT_FAILURE);
 109         }
 110
 111         if (!c->is_running(c)) {
 112                 fprintf(stderr, "%s is not running\n", my_args.name);
 113                 exit(EXIT_FAILURE);
 114         }
 115
 116         ret = c->console(c, my_args.ttynum, 0, 1, 2, my_args.escape);
 117         if (ret < 0) {
 118                 exit(EXIT_FAILURE);
 119         }
 120         return EXIT_SUCCESS;
 121 }