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chroot.c revision 1.6 
      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 #include <sys/cdefs.h>
     35 #ifndef lint
     36 __COPYRIGHT("@(#) 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
     41 #if 0
     42 static char sccsid[] = "@(#)chroot.c	8.1 (Berkeley) 6/9/93";
     43 #else
     44 __RCSID("$NetBSD: chroot.c,v 1.6 1997/10/18 04:06:32 lukem Exp $");
     45 #endif
     46 #endif /* not lint */
     47 
     48 #include <sys/types.h>
     49 
     50 #include <err.h>
     51 #include <errno.h>
     52 #include <paths.h>
     53 #include <stdio.h>
     54 #include <stdlib.h>
     55 #include <string.h>
     56 #include <unistd.h>
     57 
     58 int	main __P((int, char **));
     59 void	usage __P((void));
     60 
     61 int
     62 main(argc, argv)
     63 	int argc;
     64 	char *argv[];
     65 {
     66 	int ch;
     67 	char *shell;
     68 
     69 	while ((ch = getopt(argc, argv, "")) != -1)
     70 		switch(ch) {
     71 		case '?':
     72 		default:
     73 			usage();
     74 		}
     75 	argc -= optind;
     76 	argv += optind;
     77 
     78 	if (argc < 1)
     79 		usage();
     80 
     81 	if (chdir(argv[0]) || chroot("."))
     82 		err(1, "%s", argv[0]);
     83 
     84 	if (argv[1]) {
     85 		execvp(argv[1], &argv[1]);
     86 		err(1, "%s", argv[1]);
     87 	}
     88 
     89 	if (!(shell = getenv("SHELL")))
     90 		shell = _PATH_BSHELL;
     91 	execlp(shell, shell, "-i", NULL);
     92 	err(1, "%s", shell);
     93 	/* NOTREACHED */
     94 }
     95 
     96 void
     97 usage()
     98 {
     99 	(void)fprintf(stderr, "usage: chroot newroot [command]\n");
    100 	exit(1);
    101 }
    102