/*-

 * Copyright (c) 2004 Joerg Sonnenberger <joerg@bec.de>

 * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>

 * All rights reserved.

 *

 * 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.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.

 *

 * $FreeBSD: src/usr.sbin/jexec/jexec.c,v 1.2 2003/07/04 19:14:27 bmilekic Exp $

 * $DragonFly: src/usr.sbin/jexec/jexec.c,v 1.1 2005/01/31 22:29:59 joerg Exp $

 */

#include <sys/param.h>

#include <sys/jail.h>

#include <err.h>

#include <errno.h>

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

static int	getjailid(const char *str);

static void	usage(void);

int

main(int argc, char **argv)

{

	int jid;

	if (argc < 3)

		usage();

	jid = getjailid(argv[1]);

	if (jail_attach(jid) == -1)

		err(1, "jail_attach(%d) failed", jid);

	if (chdir("/") == -1)

		err(1, "chdir(\"/\") failed");

	if (execvp(argv[2], argv + 2) == -1)

		err(1, "execvp(%s) failed", argv[2]);

	exit(0);

}

static void

usage(void)

{

	fprintf(stderr, "usage: jexec jid command [...]\n");

	exit(1); 

}

static int

getjailid(const char *str)

{

	long v;

	char *ep;

	errno = 0;

	v = strtol(str, &ep, 10);

	if (v < INT_MIN || v > INT_MAX || errno == ERANGE)

		errc(1, ERANGE, "invalid jail id", str);

	if (ep == str || *ep != '\0')

		errx(1, "cannot parse jail id: %s.", str);

	return((int)(v));

}