docs/jexec.c
author Mahlon E. Smith <mahlon@martini.nu>
Sat, 28 Feb 2009 04:54:46 +0000 (2009-02-28)
branchmahlon-misc
changeset 12 5fd07a9e7e7b
parent 0 92d00ff32c56
permissions -rw-r--r--
* Added jail header dependencies for mkmf Makefile. * Renamed header file (bsdjail -> jail) * Fixed copyright * Initial commit of primary functionality * Attach to a running jail * Create a new jail * List and instantiate existing jails * Fetch information about existing jails * Still needs... * Attach "in a block" fleshed out * Documentation and better comments * Tests (of some kind, this will be tough) * Update for not-yet-MFC'ed multiple IP jail patch in FBSD 7.2-STABLE
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/*-
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 * Copyright (c) 2004 Joerg Sonnenberger <joerg@bec.de>
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 * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 *
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 * $FreeBSD: src/usr.sbin/jexec/jexec.c,v 1.2 2003/07/04 19:14:27 bmilekic Exp $
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 * $DragonFly: src/usr.sbin/jexec/jexec.c,v 1.1 2005/01/31 22:29:59 joerg Exp $
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 */
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#include <sys/param.h>
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#include <sys/jail.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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static int	getjailid(const char *str);
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static void	usage(void);
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int
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main(int argc, char **argv)
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{
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	int jid;
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	if (argc < 3)
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		usage();
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	jid = getjailid(argv[1]);
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	if (jail_attach(jid) == -1)
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		err(1, "jail_attach(%d) failed", jid);
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	if (chdir("/") == -1)
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		err(1, "chdir(\"/\") failed");
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	if (execvp(argv[2], argv + 2) == -1)
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		err(1, "execvp(%s) failed", argv[2]);
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	exit(0);
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}
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static void
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usage(void)
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{
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	fprintf(stderr, "usage: jexec jid command [...]\n");
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	exit(1); 
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}
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static int
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getjailid(const char *str)
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{
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	long v;
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	char *ep;
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	errno = 0;
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	v = strtol(str, &ep, 10);
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	if (v < INT_MIN || v > INT_MAX || errno == ERANGE)
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		errc(1, ERANGE, "invalid jail id", str);
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	if (ep == str || *ep != '\0')
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		errx(1, "cannot parse jail id: %s.", str);
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	return((int)(v));
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}
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