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chroot.c revision 1.2 
      1 /*
      2  * Copyright (c) 1988 The Regents of the University of California.
      3  * 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
     35 char copyright[] =
     36 "@(#) Copyright (c) 1988 The Regents of the University of California.\n\
     37  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 static char sccsid[] = "@(#)chroot.c	5.8 (Berkeley) 6/1/90";
     42 #endif /* not lint */
     43 
     44 #include <stdio.h>
     45 #include <paths.h>
     46 #include <string.h>
     47 
     48 main(argc, argv)
     49 	int argc;
     50 	char **argv;
     51 {
     52 	extern int errno;
     53 	char *shell, *getenv();
     54 
     55 	if (argc < 2) {
     56 		(void)fprintf(stderr, "usage: chroot newroot [command]\n");
     57 		exit(1);
     58 	}
     59 	if (chdir(argv[1]) || chroot("."))
     60 		fatal(argv[1]);
     61 	if (argv[2]) {
     62 		execvp(argv[2], &argv[2]);
     63 		fatal(argv[2]);
     64 	} else {
     65 		if (!(shell = getenv("SHELL")))
     66 			shell = _PATH_BSHELL;
     67 		execlp(shell, shell, "-i", (char *)NULL);
     68 		fatal(shell);
     69 	}
     70 	/* NOTREACHED */
     71 }
     72 
     73 fatal(msg)
     74 	char *msg;
     75 {
     76 	extern int errno;
     77 
     78 	(void)fprintf(stderr, "chroot: %s: %s\n", msg, strerror(errno));
     79 	exit(1);
     80 }
     81