/*-
 * Copyright (c) 1991, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Donn Seeley at Berkeley Software Design, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * @(#) Copyright (c) 1991, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)init.c   8.1 (Berkeley) 7/15/93
 * $FreeBSD: src/sbin/init/init.c,v 1.38.2.8 2001/10/22 11:27:32 des Exp $
 */

#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/sysctl.h>
#include <sys/wait.h>
#include <sys/stat.h>

#include <db.h>
#include <errno.h>
#include <fcntl.h>
#include <libutil.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <ttyent.h>
#include <unistd.h>
#include <sys/reboot.h>
#include <err.h>

#include <stdarg.h>

#include "pathnames.h"

static int      setctty(const char *);
static void     runcom(char **);

/*
 * The mother of all processes.
 */
int
main(int argc __unused, char **argv)
{
        /* Dispose of random users. */
        if (getuid() != 0)
                errx(1, "%s", strerror(EPERM));

        /* Init is not allowed to die, it would make the kernel panic */
        signal(SIGTERM, SIG_IGN);

        runcom(argv);
        return 1;
}

static int
setctty(const char *name)
{
        int fd;

        revoke(name);
        if ((fd = open(name, O_RDWR)) == -1) {
                exit(1);
        }

        if (login_tty(fd) == -1) {
                exit(1);
        }

        return fd;
}


static void
runcom(char **argv_orig)
{
        pid_t pid, wpid;
        int status, error;
        const char *argv[4];
        struct sigaction sa;

        if ((pid = fork()) == 0) {
                sigemptyset(&sa.sa_mask);
                sa.sa_flags = 0;
                sa.sa_handler = SIG_IGN;
                sigaction(SIGTSTP, &sa, NULL);
                sigaction(SIGHUP, &sa, NULL);

                setctty(_PATH_CONSOLE);

                argv[0] = "sh";
                argv[1] = _PATH_RUNCOM;
                argv[2] = "autoboot" ;
                argv[3] = NULL;

                sigprocmask(SIG_SETMASK, &sa.sa_mask, NULL);

                execv(_PATH_BSHELL, __DECONST(char **, argv));
                exit(1);        /* force single user mode */
        }

        do {
                wpid = waitpid(-1, &status, WUNTRACED);
        } while (wpid != pid);

        error = chdir(_PATH_NEWROOT);
        if (error)
                goto chroot_failed;

        error = chroot_kernel(_PATH_NEWROOT);
        if (error)
                goto chroot_failed;

        error = chroot(_PATH_NEWROOT);
        if (error)
                goto chroot_failed;

        execv("/sbin/init", __DECONST(char **, argv_orig));

        /* We failed to exec /sbin/init in the chroot, sleep forever */
chroot_failed:
        while(1) {
                sleep(3);
        };
}