usr.sbin/jexec/jexec.c

   1 /*-
   2  * Copyright (c) 2004 Joerg Sonnenberger <joerg@bec.de>
   3  * Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/usr.sbin/jexec/jexec.c,v 1.2 2003/07/04 19:14:27 bmilekic Exp $
  28  * $DragonFly: src/usr.sbin/jexec/jexec.c,v 1.2 2006/08/22 13:02:30 joerg Exp $
  29  */
  30
  31 #include <sys/param.h>
  32 #include <sys/jail.h>
  33
  34 #include <err.h>
  35 #include <errno.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39
  40 static int      getjailid(const char *str);
  41 static void     usage(void);
  42
  43 int
  44 main(int argc, char **argv)
  45 {
  46         int jid;
  47
  48         if (argc < 3)
  49                 usage();
  50         jid = getjailid(argv[1]);
  51         if (jail_attach(jid) == -1)
  52                 err(1, "jail_attach(%d) failed", jid);
  53         if (chdir("/") == -1)
  54                 err(1, "chdir(\"/\") failed");
  55         if (execvp(argv[2], argv + 2) == -1)
  56                 err(1, "execvp(%s) failed", argv[2]);
  57         exit(0);
  58 }
  59
  60 static void
  61 usage(void)
  62 {
  63         fprintf(stderr, "usage: jexec jid command [...]\n");
  64         exit(1);
  65 }
  66
  67 static int
  68 getjailid(const char *str)
  69 {
  70         long v;
  71         char *ep;
  72
  73         errno = 0;
  74         v = strtol(str, &ep, 10);
  75         if (v < INT_MIN || v > INT_MAX || errno == ERANGE)
  76                 errc(1, ERANGE, "invalid jail id: %s", str);
  77         if (ep == str || *ep != '\0')
  78                 errx(1, "cannot parse jail id: %s.", str);
  79
  80         return((int)(v));
  81 }