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/*
* lxc: linux Container library
*
* (C) Copyright IBM Corp. 2007, 2010
*
* 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 <unistd.h>
#include <errno.h>
#include <pwd.h>
#include <stdlib.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "attach.h"
#include "commands.h"
#include "arguments.h"
#include "caps.h"
#include "log.h"
lxc_log_define(lxc_attach_ui, lxc);
static const struct option my_longopts[] = {
LXC_COMMON_OPTIONS
};
static struct lxc_arguments my_args = {
.progname = "lxc-attach",
.help = "\
--name=NAME\n\
\n\
Execute the specified command - enter the container NAME\n\
\n\
Options :\n\
-n, --name=NAME NAME for name of the container\n",
.options = my_longopts,
.parser = NULL,
.checker = NULL,
};
int main(int argc, char *argv[], char *envp[])
{
int ret;
pid_t pid;
struct passwd *passwd;
uid_t uid;
char *curdir;
ret = lxc_caps_init();
if (ret)
return ret;
ret = lxc_arguments_parse(&my_args, argc, argv);
if (ret)
return ret;
ret = lxc_log_init(my_args.log_file, my_args.log_priority,
my_args.progname, my_args.quiet);
if (ret)
return ret;
pid = get_init_pid(my_args.name);
if (pid < 0) {
ERROR("failed to get the init pid");
return -1;
}
curdir = get_current_dir_name();
ret = lxc_attach_to_ns(pid);
if (ret < 0) {
ERROR("failed to enter the namespace");
return -1;
}
if (curdir && chdir(curdir))
WARN("could not change directory to '%s'", curdir);
free(curdir);
pid = fork();
if (pid < 0) {
SYSERROR("failed to fork");
return -1;
}
if (pid) {
int status;
again:
if (waitpid(pid, &status, 0) < 0) {
if (errno == EINTR)
goto again;
SYSERROR("failed to wait '%d'", pid);
return -1;
}
if (WIFEXITED(status))
return WEXITSTATUS(status);
return -1;
}
if (!pid) {
if (my_args.argc) {
execve(my_args.argv[0], my_args.argv, envp);
SYSERROR("failed to exec '%s'", my_args.argv[0]);
return -1;
}
uid = getuid();
passwd = getpwuid(uid);
if (!passwd) {
SYSERROR("failed to get passwd " \
"entry for uid '%d'", uid);
return -1;
}
{
char *const args[] = {
passwd->pw_shell,
NULL,
};
execve(args[0], args, envp);
SYSERROR("failed to exec '%s'", args[0]);
return -1;
}
}
return 0;
}
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