chroot.c revision 24428 
1/*
2 * Copyright (c) 1988, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char copyright[] =
36"@(#) Copyright (c) 1988, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)chroot.c	8.1 (Berkeley) 6/9/93";
42#endif /* not lint */
43
44#include <sys/types.h>
45
46#include <err.h>
47#include <errno.h>
48#include <paths.h>
49#include <stdio.h>
50#include <stdlib.h>
51#include <string.h>
52#include <unistd.h>
53
54void usage __P((void));
55
56int
57main(argc, argv)
58	int argc;
59	char *argv[];
60{
61	int ch;
62	char *shell;
63
64	while ((ch = getopt(argc, argv, "")) != -1)
65		switch(ch) {
66		case '?':
67		default:
68			usage();
69		}
70	argc -= optind;
71	argv += optind;
72
73	if (argc < 1)
74		usage();
75
76	if (chdir(argv[0]) || chroot("."))
77		err(1, "%s", argv[0]);
78
79	if (argv[1]) {
80		execvp(argv[1], &argv[1]);
81		err(1, "%s", argv[1]);
82	}
83
84	if (!(shell = getenv("SHELL")))
85		shell = _PATH_BSHELL;
86	execlp(shell, shell, "-i", NULL);
87	err(1, "%s", shell);
88	/* NOTREACHED */
89}
90
91void
92usage()
93{
94	(void)fprintf(stderr, "usage: chroot newroot [command]\n");
95	exit(1);
96}
97